Scientific publications—2018

 

Each year, CRC 's researchers author a number of publications communicating successes in advanced wireless telecommunications R&D . Integral to their work is sharing the results with others.

Here you will find abstracts and links to papers published in peer-reviewed scientific journals or books or presented at conference proceedings.

If you experience issues accessing the full report or the website, please contact us. Other formats of documents are also available upon request.


Research publications—2018
Title Authors
Electromagnetic Engineered Surface Gratings at 5G Bands Using Printed Electronics

Year: 2018

Abstract: Electromagnetic engineered surfaces (EES) are a recently introduced concept with the implementation goal of controlling the electromagnetic scattering in communications environments. This paper will focus on EES design techniques to enable the passive extension of line of sight (LoS) coverage into non-LoS regions. © 2018 IEEE.

Source title: 2018 International Flexible Electronics Technology Conference, IFETC 2018

DOI : 10.1109/IFETC.2018.8583977

Series Number: 19 December 2018, Article number 8583977

Link: Electromagnetic Engineered Surface Gratings at 5G Bands Using Printed Electronics

Ethier J., Chaharmir R., Shaker J., Hettak K.
A novel multifunctional EBG-based coupled-line-defect directional coupler based on layered dielectric substrates

Year: 2018

Abstract: In this paper, a novel multifunctional coupler based on line-defect layered electromagnetic bandgap (EBG) waveguides is proposed and studied. Extensive full-wave simulations are used to establish the critical nature of the coupling region for the realization of different functionalities of the coupler. Changing the separation between the rings or orientation of the rings in the coupling and/or channel regions leads to very interesting and unique coupling mechanisms, such as forward-wave, through-wave, and/or backward-wave quasi-0- and 3-dB couplers that distinguish the proposed topology from conventional proximity directional couplers. In the final analysis, one can switch between configurations by changing the orientation of the rings in the coupling region. These configurations with coplanar-slot-line feeding structures are fabricated and tested at X-band for demonstration purposes. Measurement results validated the design procedure and confirmed the general trends in simulations. The proposed EBG coupler is promising for beamforming matrix and antenna array feeding networks. © 2011-2012 IEEE.

Source title: IEEE Transactions on Components, Packaging and Manufacturing Technology

DOI : 10.1109/TCPMT.2018.2810064

Series Number: Volume 8, Issue 12

Link: A novel multifunctional EBG-based coupled-line-defect directional coupler based on layered dielectric substrates

Ouassal H., Shaker J., Roy L., Hettak K., Amaya R.E.
Wireless In-Band Distribution Link using LDM for SFN Transmitters and Gapfillers in ATSC 3.0

Year: 2018

Abstract: Delivering services to mobile devices in densely populated indoor and enclosed areas, such as stadiums, airports, train stations, and shopping malls, has the potential to bring more viewership to terrestrial broadcast services. The next-generation ATSC 3.0 system is designed with extremely robust transmission capability to deliver high-quality mobile services to portable and handheld receivers. Even with the most robust transmission mode, delivering services to these indoor environments still proves challenging due to high penetration losses. One solution is to deploy low-power, single frequency network (SFN) transmitters, called SFN Gapfillers, which can provide reliable mobile services specifically to indoor/enclosed areas. In deploying SFN Gapfillers, a significant cost derives from the service data distribution link. In this paper, we propose a wireless, in-band distribution link using Layered Division Multiplexing (LDM) technology. Instead of dedicated fiber or microwave links, in the proposed solution, the service distribution-link data is delivered to the SFN Gapfillers with a high-power transmitter, using the Enhanced Layer of a two-layer ATSC 3.0 signal, which results in low infrastructure and operational costs. By using LDM, the wireless distribution links are implemented with high spectrum efficiency since they share the same TV band with the broadcast services. To guarantee successful SFN operation of the Gapfillers, sufficient delay of the broadcast service signal from the SFN distribution signal is required. The proposed technology also can be applied to deploy conventional SFN transmitters to extend coverage areas or to provide services to remote areas. © 2018 IEEE.

Source title: 2018 IEEE Broadcast Symposium, BTS 2018

DOI : 10.1109/BTS.2018.8551152

Series Number: 27 November 2018, Article number 8551152

Link: Wireless In-Band Distribution Link using LDM for SFN Transmitters and Gapfillers in ATSC 3.0

Zhang L., Wu Y., Li W., Salehian K., Lafleche S., Hong Z., Park S.-I., Lee J.-Y., Mook Kim H., Hur N., Weiss S.M.
Engineering the Environment to Enhance Millimetre-Wave Communications for Connected Vehicles

Year: 2018

Abstract: This paper demonstrates how engineered electromagnetic surfaces can be designed and deployed in an urban corridor to enable non-line-of-sight (NLOS) millimetre-wave communications between connected vehicles to support massive automotive sensing. Ray-tracing is used to show the potential improvement in NLOS coverage at 28 GHz, enabling vehicle-to-vehicle high-data-rate transfer of sensor data. © 2018 European Microwave Association.

Source title: 2018 48th European Microwave Conference, EuMC 2018

DOI : 10.23919/EuMC.2018.8541394

Series Number: 20 November 2018, Article number 8541394

Link: Engineering the Environment to Enhance Millimetre-Wave Communications for Connected Vehicles

Raut S., Petosa A.
Engineering the 5G Environment

Year: 2018

Abstract: This summary paper examines how engineered electromagnetic surfaces can be applied to alter the way radio signals propagate in dense urban environments in order to enhance coverage or improve densification, thereby enabling the engineering of the environment in a way that enhances radio spectrum use in smart cities. Examples of designs and deployments in the Wi-Fi and millimeter-wave bands are presented for both indoor and outdoor applications. © 2018 IEEE.

Source title: IEEE 5G World Forum, 5GWF 2018 - Conference Proceedings

DOI : 10.1109/5GWF.2018.8516930

Series Number: 31 October 2018, Article number 8516930

Link: Engineering the 5G Environment

Petosa A.
Using Non-Orthogonal Multiplexing for In-Band Full-Duplex Backhaul for 5G Broadcasting

Year: 2018

Abstract: Delivering broadcast-type services is one of the main use cases defined for the next generation 5G system. To deliver robust mobile broadcast services, single-frequency-network (SFN) is preferred due to the inherent spatial diversity. However, each SFN transmitter requires a backhaul link, which results in high infrastructure cost, especially for small cell networks with large number of transmitters. This paper proposes a cost-efficient in-band full-duplex backhaul solution using power-based non-orthogonal multiplexing technology (P-NOM). In the proposed solution, the backhaul data and mobile services are transmitted in different signal layers in a P-NOM system at the same time and using the same spectrum. In order to achieve SFN operation, careful timing control on the backhaul and service transmissions is designed. When comparing to in-band backhaul solutions using orthogonal multiplexing (OM) technologies, the proposed P-NOM based technology achieves higher spectrum efficiency and network scalability. In addition, the proposed technology can be directly applied for backhaul transmission in mixed unicast and broadcast delivery, which is a desired feature for 5G to achieve more efficient use of spectrum. © 2018 IEEE.

Source title: IEEE 5G World Forum, 5GWF 2018 - Conference Proceedings

DOI : 10.1109/5GWF.2018.8516979

Series Number: 31 October 2018, Article number 8516979

Link: Using Non-Orthogonal Multiplexing for In-Band Full-Duplex Backhaul for 5G Broadcasting

Zhang L., Wu Y., Li W., Salehian K., Laflèche S., Hong Z., Park S.-I., Lee J.-Y., Kim H.M., Hur N.
A Routing and Interface Assignment Algorithm for Multi-Channel Multi-Interface Ad Hoc Networks

Year: 2018

Abstract: In this paper, we present a routing and interface assignment algorithm for multi-channel multi-interface (MCMI) wireless ad hoc networks. An MCMI network consists of nodes that have more than one interface, and more than one channel available for transmission. The proposed algorithm takes into account both the number of hops between the source to the destination nodes, and the effects of adjacent hop interference. The algorithm has two decoupled steps: route selection and interface assignment. The step of route selection finds the path that has the minimum lower bound among all possible routes between the source and the destination while the step of interface assignment assigns an interface to a channel on each hop on that path. The interface assignment is based on the use of the Viterbi algorithm. The use of decoupled steps makes the algorithm computationally efficient, while the use of the lower bound metrics in route selection and the Viterbi algorithm in interface assignment helps improving the global optimality of the routing. Computer simulation and examples are used to demonstrate the effectiveness and performance of the proposed technique. Comparisons are made to other existing routing techniques in the area of dynamical spectrum access. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Source title: Mobile Networks and Applications

DOI : 10.1007/s11036-018-1041-z

Series Number: Volume 23, Issue 5

Link: A Routing and Interface Assignment Algorithm for Multi-Channel Multi-Interface Ad Hoc Networks

Zhou Y.
Editorial: MONET Special Issue on Recent Advances in Ad Hoc Networking

Year: 2018

Abstract: [No abstract available]

Source title: Mobile Networks and Applications

DOI : 10.1007/s11036-018-1035-x

Series Number: Volume 23, Issue 5

Link: Editorial: MONET Special Issue on Recent Advances in Ad Hoc Networking

Zhou Y., Kunz T.
Editorial: Ad Hoc Networking and Emerging Applications

Year: 2018

Abstract: [No abstract available]

Source title: Mobile Networks and Applications

DOI : 10.1007/s11036-017-0837-6

Series Number: Volume 23, Issue 5

Link: Editorial: Ad Hoc Networking and Emerging Applications

Zhou Y., Kunz T., Fischer S., Zhong Z.
2.4 to 61 GHz Multiband Double-Directional Propagation Measurements in Indoor Office Environments

Year: 2018

Abstract: This paper presents the details and results of double-directional propagation measurements carried out in two indoor office environments: A semi-open, cubicle-Type office space and a more traditional work environment with closed offices. The measurements cover seven frequency bands from 2.4 to 61 GHz, permitting the propagation characteristics to be compared over a wide range of candidate radio frequencies for next-generation mobile wireless systems, including ultra high frequency and millimeter-wave bands. A novel processing algorithm is introduced for the expansion of multiband measurement data into sets of discrete multipath components. Based on the resulting multipath parameter estimates, models are presented for frequency-dependent path loss, shadow fading, copolarization ratio, delay spread, and angular spreads, along with their interfrequency correlations. Our results indicate a remarkably strong consistency in multipath structure over the entire frequency range considered. © 1963-2012 IEEE.

Source title: IEEE Transactions on Antennas and Propagation

DOI : 10.1109/TAP.2018.2851279

Series Number: Volume 66, Issue 9

Link: 2.4 to 61 GHz Multiband Double-Directional Propagation Measurements in Indoor Office Environments

De Jong Y.L.C., Pugh J.A., Bennai M., Bouchard P.
Novel Automatic Human-Height Measurement Using a Digital Camera

Year: 2018

Abstract: Nowadays, automatic object-size measurement (AOSM) techniques are in high demand since there are numerous applications including three-dimensional multimedia entertainment games, cyber-physical interaction, and real-time geographical survey. When a scene is complex with many objects, the AOSM problem is quite challenging because it is very hard to describe the object of interest a priori. In this paper, we present a novel efficient automatic human-height measurement scheme using a single camera. Our proposed new scheme is very robust so that the heights of multiple persons within the scene can be estimated automatically and simultaneously. The experimental results demonstrate that the average error percentage is less than 2% in general. © 2018 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2018.8436673

Series Number: Volume 2018-June, 14 August 2018, Article number 8436673

Link: Novel Automatic Human-Height Measurement Using a Digital Camera

Tian R., Pu L., Wu H.-C., Wu Y.
ATSC 3.0 Transmitter Carrier and Timing Offset for Co-Channel Interference Mitigation

Year: 2018

Abstract: The transition from ATSC 1.0 to ATSC 3.0 would most likely be based on the ATSC 1.0 coverage such that ATSC 3.0 stations can provide at least one fixed service with coverage greater than or equal to the replaced ATSC 1.0. However, designed with low SNR thresholds, the ATSC 3.0 robust services embedded in the same channel can be received much further away than the enhanced layer fixed services, and their coverage areas may overlap with those of the neighboring co-channel stations transmitting different programs. Such cochannel interferences (CCI) could be very high in some areas close to the boundary between the neighboring stations. Since the ATSC 3.0 system is designed with only one set of pilot sequences, the low SNR thresholds are more vulnerable to CCIs due to channel mismatch. Currently two sources causing CCIs are observed, one is the pilot overlapping, another is the Bootstrap overlapping. To resolve these problems, in this paper, carrier and timing offset techniques are proposed at the transmitter side to mitigate the CCIs, resulting in no impact to the receivers' implementation. © 2018 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2018.8436663

Series Number: Volume 2018-June, 14 August 2018, Article number 8436663

Link: ATSC 3.0 Transmitter Carrier and Timing Offset for Co-Channel Interference Mitigation

Li W., Zhang L., Wu Y., Salehian K., Lafleche S., Park S.-I., Lee J.-Y., Kim H.-M., Hur N.
Performance Evaluation of ATSC 3.0 Mobile Service with LDM/TDM under TU-6 Channel

Year: 2018

Abstract: This paper presents performance comparison between layered division multiplexing (LDM) and time division multiplexing (TDM) based mobile services in the Advanced Television System Committee (ATSC) 3.0 standard. The comparison has been performed through extensive computer simulations, leveraging full-chain simulator entirely compliant with A/322. The simulation results demonstrate that LDM can significantly lower the signal-to-noise ratio (SNR) requirement compared to TDM in a given mobile scenario while maintaining the same (or analogous possible) data rate. For instance, LDM based mobile service is 6.1 dB more robust than TDM based service at a velocity of 100 km/h. In addition, even though LD M uses larger FFT size than TDM (16k-FFT for LDM and 8k-FFT for TDM), it is verified that LDM based mobile service is fully feasible under high speed condition. © 2018 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2018.8436918

Series Number: Volume 2018-June, 14 August 2018, Article number 8436918

Link: Performance Evaluation of ATSC 3.0 Mobile Service with LDM/TDM under TU-6 Channel

Ahn S., Park S.-I., Lee J.-Y., Kwon S., Liml B.-M., Kim H.M., Hur N., Wu Y., Zhang L., Li W., Kim H., Kim J.
Spectrum Sensing Based on Novel Blind Pilot Detection Algorithm

Year: 2018

Abstract: In this paper, we attempt to explore a new spectrum-sensing scheme, which involves a novel robust pilot-detection mechanism. Conventional signal (pilot) detection approaches rely on sampling the signal time-waveform or the corresponding frequency-spectrum. These approaches are seriously restricted to temporal variations and high noise-levels. We propose a new paradigm to transform the original received-signal waveform to the power spectrum and then the ultimate probabilistic function. Thus robust signal processing method such as clustering can be utilized to lead to the better pilot-detection performance of frequency-modulation (FM) broadcasted signals. To demonstrate the performance of our proposed pilot-tone detection and pilot-frequency estimation scheme, the corresponding Monte Carlo simulation results are compared with the conventional spectral-difference detector. Our proposed new pilot-tone detection and pilot-frequency estimation scheme lead to a significant performance margin compared to the conventional method, especially in low signal-to-noise ratios. © 2018 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2018.8436750

Series Number: Volume 2018-June, 14 August 2018, Article number 8436750

Link: Spectrum Sensing Based on Novel Blind Pilot Detection Algorithm

Wu H.-C., Yu B., Yan K., Zhang X., Wu Y.
ATSC 3.0 Physical Layer Modulation and Coding Performance Analysis

Year: 2018

Abstract: This paper presents ATSC 3.0 physical (PHY) layer modulation and coding performance through computer simulations, laboratory tests, and field trials. Analysis results show that the measured results in laboratory and field are generally well aligned with computer simulation results. The ATSC 3.0 PHY layer performance covers ultra-robust reception (negative SNR operation with QPSK and 2/15 LDPC code) to very high-throughput (over 50 Mbps with 4096-NUC with 13/15 LDPC code) in real field environment. © 2018 IEEE.

Source title: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB

DOI : 10.1109/BMSB.2018.8436876

Series Number: Volume 2018-June, 14 August 2018, Article number 8436876

Link: ATSC 3.0 Physical Layer Modulation and Coding Performance Analysis

Park S.-I., Lee J.-Y., Kwon S., Lim B.-M., Ahn S., Kim H.M., Jeon S., Lee J., Simon M., Aitken M., Gage K., Wu Y., Zhang L., Li W., Kim J.
Evaluation Metrics and Simulation Tools for 5G Millimeter-Wave Networks

Year: 2018

Abstract: Recently, mmWave spectrum bands have attracted a lot of attention as they can be exploited by 5G to achieve high data rates and support ultrahigh traffic density. Since there are already systems allocated and operating in mmWave bands, it is critical to evaluate emerging spectrum sharing paradigms and enabling technologies for successful realization of 5G. One of the key challenges is the availability of evaluation metrics and tools to provide technical information enabling evidence-based policy discussions on the allocation and management of mmWave spectrum. In this article, we present and discuss evaluation metrics and simulation tools for 5G mmWave systems from a regulator's perspective. In particular, we propose a systematic approach to develop meaningful spectrum sharing metrics and demonstrate simulation tools suitable for assessing coverage in 5G mmWave small cell networks. © 2002-2012 IEEE.

Source title: IEEE Wireless Communications

DOI : 10.1109/MWC.2018.1700407

Series Number: Volume 25, Issue 4

Link: Evaluation Metrics and Simulation Tools for 5G Millimeter-Wave Networks

Rutagemwa H., Baddour K.E., Brown C., Raut S.
5G MmWave Small Cell Networks: Architecture, Self-Organization, and Management

Year: 2018

Abstract: [No abstract available]

Source title: IEEE Wireless Communications

DOI : 10.1109/MWC.2018.8454519

Series Number: Volume 25, Issue 4

Link: 5G MmWave Small Cell Networks: Architecture, Self-Organization, and Management

Rong B., Dianati M., Zhou L., Karagiannidis G.K., Wang C.
Multihop multicast header compression in MANETs

Year: 2018

Abstract: A common technique for improving throughput and increasing spectrum efficiency in wireless networks is the use of header compression. Removing static, implied or redundant protocol fields by synchronizing state information between a sender and receiver reduces per-packet overhead for long lived communication flows. Previous header compression work has focused primarily on single-hop unicast traffic. In this paper we describe a multi-hop multicast header compression (MMHC) scheme applicable to mobile ad-hoc networks. MMHC provides an end-to-end solution where multicast forwarders and receivers are synchronized simultaneously and not hop-by-hop as in previous schemes. Simulation results show that the reductions in per-transmission overhead achieved provide significant gains in both throughput and latency, especially when the average payload size of packets aggregated into the communication flow is small. © 2018 IEEE.

Source title: IEEE International Conference on Communications

DOI : 10.1109/ICC.2018.8422314

Series Number: Volume 2018-May, 27 July 2018, Article number 8422314

Link: Multihop multicast header compression in MANETs

Kidston D., Chae W., Rutagemwa H.
Capacity Enhancement for mmWave Multi-Beam Satellite-Terrestrial Backhaul via Beam Sharing

Year: 2018

Abstract: The satellite is a primary means for providing emergency communication backhaul in disaster areas, where large bandwidth is demanded to support communication services in a wide affected area. Millimeter-wave (mmWave) communication with sufficient spectral resources promises significant enhancement to satellite-terrestrial link capacity. However, the alignment delay and mutual interference caused by directional communications with narrow beams severely limit the capacity of mmWave communication. To this end, we optimize the beamwidth to reduce the impact of beam alignment overhead on capacity. Then, considering the multi-user interference between beams, we propose a transmission scheduling scheme based on beam sharing, namely users with strong mutual interference when served simultaneously by independent beams, share the same beam. A heuristic algorithm is proposed to derive the groups of users sharing beams, and their beamwidth. Simulation results show that the proposed scheme achieves considerable capacity enhancement compared to the one-to-one beam occupation scheme (OB) and fixed beam scheme (FB), thus improving the spectrum efficiency of mmWave satellite-terrestrial communication. © 2018 IEEE.

Source title: IEEE International Conference on Communications

DOI : 10.1109/ICC.2018.8423030

Series Number: Volume 2018-May, 27 July 2018, Article number 8423030

Link: Capacity Enhancement for mmWave Multi-Beam Satellite-Terrestrial Backhaul via Beam Sharing

Cao Q., Rutagemwa H., Zhou F., Yu P., Feng L., Li W., Xiong A., Qiu X.
Dynamic spectrum assignment for land mobile radio with deep recurrent neural networks

Year: 2018

Abstract: In this paper, measurements from a spectrum awareness system are used to study the application of machine learning methods in dynamic spectrum assignment for Land Mobile Radio (LMR). Specifically, a deep recurrent neural network is used to learn the time-varying distributions of users' traffic, which in turn, help to determine the best spectrum assignment and sharing strategies in LMR bands. Using RF data, network simulations are conducted to validate and evaluate the suitability of the chosen methodology. It is shown that the deep learning approaches have great potential for characterizing spectrum usage patterns and facilitating spectrum assignment decisions in dynamic wireless environment. © 2018 IEEE.

Source title: 2018 IEEE International Conference on Communications Workshops, ICC Workshops 2018 - Proceedings

DOI : 10.1109/ICCW.2018.8403659

Link: Dynamic spectrum assignment for land mobile radio with deep recurrent neural networks

Rutagemwa H., Ghasemi A., Liu S.
Opportunistic NOMA-Based Massive MIMO Precoding for 5G New Radio

Year: 2018

Abstract: This work investigates multicast services, which play a critical role in 5G new radio (NR). In particular, we propose a hybrid unicast/multicast MIMO precoding based on NOMA. Our scheme first categorizes unicast users into NOMA and non-NOMA types and then utilizes null space and successive interference cancellation to eliminate the signal leakage. To justify the effectiveness and efficiency of our design, we also present simulation results in typical massive MIMO scenarios. © 2018 Ke Xiao et al.

Source title: Wireless Communications and Mobile Computing

DOI : 10.1155/2018/2328954

Series Number: Volume 2018, 20 June 2018, Article number 2328954

Link: Opportunistic NOMA-Based Massive MIMO Precoding for 5G New Radio

Xiao K., Kadoch M., Rutagemwa H., Li C.
Efficient Transmission of Multiple Broadcasting Services Using LDM and SHVC

Year: 2018

Abstract: In this paper, we present an efficient transmission method of multiple broadcasting services using layered division multiplexing (LDM) and scalable high efficiency video coding (SHVC) based on the next generation terrestrial digital broadcasting standard, advanced television systems committee 3.0. In a two-layer LDM system, each layer forms a physical layer pipe that carries base layer and enhancement layer video streams of SHVC, respectively. This combination of physical and presentation layers technologies can maximize channel utilization when multiple broadcasting services are delivered in a single radio frequency channel with different robustness and reception conditions. An intensive performance analysis is provided when the proposed combination of LDM and SHVC is compared with other approaches, such as time division multiplexing and/or high efficiency video coding simulcast broadcasting. Several performance measurements are also introduced, such as constant data rate measurement and constant quality measurement, which are used to evaluate the performance of video codecs in conjunction with different physical layer system parameters. A prototype hardware system with LDM and SHVC capable of selecting different parameter combinations is tested in the laboratory and in real field environments to verify the performance and feasibility of the proposed LDM and SHVC combination. Results show that the proposed LDM and SHVC combination provides significant gains on video service quality as well as reception robustness. © 1963-12012 IEEE.

DOI : 10.1109/TBC.2017.2755264

Series Number: Volume 64, Issue 2

Link: Efficient Transmission of Multiple Broadcasting Services Using LDM and SHVC

Lee J.-Y., Park S.-I., Kwon S., Lim B.-M., Kim H.M., Hur N., Pesin A., Chevet J.-C., Llach J., Stein A.J., Jeon S., Wu Y.
Tropospheric weather influenced by solar wind through atmospheric vertical coupling downward control

Year: 2018

Abstract: Occurrence of severe weather in the context of solar wind coupling to the magnetosphere-ionosphere-atmosphere (MIA) system is investigated. It is observed that significant snowfall, wind and heavy rain, particularly if caused by low pressure systems in winter, tend to follow arrivals of high-speed solar wind. Previously published statistical evidence that explosive extratropical cyclones in the northern hemisphere tend to occur within a few days after arrivals of high-speed solar wind streams from coronal holes (Prikryl et al., 2009, 2016) is corroborated for the southern hemisphere. Cases of severe weather events are examined in the context of the magnetosphere-ionosphere-atmosphere (MIA) coupling. Physical mechanism to explain these observations is proposed. The leading edge of high-speed solar wind streams is a locus of large-amplitude magneto-hydrodynamic waves that modulate Joule heating and/or Lorentz forcing of the high-latitude lower thermosphere generating medium-scale atmospheric gravity waves that propagate upward and downward through the atmosphere. Simulations of gravity wave propagation in a model atmosphere using the Transfer Function Model (Mayr et al., 1990) reveal that propagating waves originating in the lower thermosphere can excite a spectrum of gravity waves in the lower atmosphere. In spite of significantly reduced amplitudes but subject to amplification upon reflection in the upper troposphere, these gravity waves can provide a lift of unstable air to release instabilities in the troposphere and initiate convection to form cloud/precipitation bands. It is primarily the energy provided by release of latent heat that leads to intensification of storms. These results indicate that vertical coupling in the atmosphere exerts downward control from solar wind to the lower atmospheric levels influencing tropospheric weather development. © 2017 Elsevier Ltd

Source title: Journal of Atmospheric and Solar-Terrestrial Physics

DOI : 10.1016/j.jastp.2017.07.023

Series Number: Volume 171, June 2018

Link: Tropospheric weather influenced by solar wind through atmospheric vertical coupling downward control

Prikryl P., Bruntz R., Tsukijihara T., Iwao K., Muldrew D.B., Rušin V., Rybanský M., Tura M., Šastný P.
On improving imputation accuracy of LTE spectrum measurements data

Year: 2018

Abstract: Univariate imputation, such as Kalman filtering, is not able to provide a reasonable imputation for a variable when periods of missing values are large. A new method is needed that can provide feasible imputations in such scenarios. We propose a novel method of applying multivariate imputation in combination with an existing univariate imputation approach to a single variable in an LTE spectrum dataset, such as the average cell throughput, by exploiting the high weekly seasonality of this variable. Performance comparison shows that our proposed method significantly outperforms Kalman filtering in terms of imputation accuracy. © 2018 IEEE.

Source title: Wireless Telecommunications Symposium

DOI : 10.1109/WTS.2018.8363929

Series Number: Volume 2018-April, 23 May 2018

Link: On improving imputation accuracy of LTE spectrum measurements data

Chaudhry A., Li W., Basri A., Patenaude F.
Power allocation in small cell networks with full-duplex self-backhauls and massive MIMO

Year: 2018

Abstract: With the dense deployment of small cell networks, low-cost backhaul schemes for small cell base stations (SBSs) have attracted great attentions. Self-backhaul using cellular communication technology is considered as a promising solution. Although some excellent works have been done on self-backhaul in small cell networks, most of them do not consider the recent advances of full-duplex (FD) and massive multiple-input and multiple-output (MIMO) technologies. In this paper, we propose a self-backhaul scheme for small cell networks by combining FD and massive MIMO technologies. In our proposed scheme, the macro base station (MBS) is equipped with massive MIMO antennas, and the SBSs have the FD communication ability. By treating the SBSs as special macro users, we can achieve the simultaneous transmissions of the access link of users and the backhaul link of SBSs in the same frequency. Furthermore, considering the existence of inter-tier and intra-tier interference, we formulate the power allocation problem of the MBS and SBSs as an optimization problem. Because the formulated power allocation problem is a non-convex problem, we transform the original problem into a difference of convex program by successive convex approximation method and variable transformation, and then solve it using a constrained concave convex procedure based iterative algorithm. Finally, extensive simulations are conducted with different system configurations to verify the effectiveness of the proposed scheme. © 2016, Springer Science+Business Media New York.

Source title: Wireless Networks

DOI : 10.1007/s11276-016-1381-1

Series Number: Volume 24, Issue 4

Link: Power allocation in small cell networks with full-duplex self-backhauls and massive MIMO

Chen L., Yu F.R., Ji H., Rong B., Leung V.C.M.
Convergence of a Terrestrial Broadcast Network and a Mobile Broadband Network

Year: 2018

Abstract: With the proliferation and diversification of mobile communication services, the current mobile broadband networks face severe challenges. The progressive video service that will make up the majority of future network traffic has more demands for transmission bandwidth, network capacity, and management flexibility. Moreover, denser connectivity, higher reliability, lower latency, and better interaction impose some great challenges to existing networks. In order to meet these growing demands, a promising approach is to integrate a broadcast network with a cellular network. In this article, we briefly set forth the latest progress on the cellular network and the broadcast network, respectively. Then the logic architecture of the integrated network is given to clarify the functional partitioning. In addition, the physical architecture of the integrated network is presented to enable coordination in different aspects. Some feasible strategies are discussed and several promising technologies are presented. © 2018 IEEE.

Source title: IEEE Communications Magazine

DOI : 10.1109/MCOM.2018.1700616

Series Number: Volume 56, Issue 3

Link: Convergence of a Terrestrial Broadcast Network and a Mobile Broadband Network

Zhang W., Huang Y., He D., Zhang Y., Zhang Y., Liu R., Xu Y., Wu Y., Zhang L.
Layered-Division Multiplexing: An Enabling Technology for Multicast/Broadcast Service Delivery in 5G

Year: 2018

Abstract: Future 5G systems will include a point-to-multipoint (P2MP) transmission mode to achieve high capacity and high spectrum efficiency for multiple use cases, such as IoT, lifeline communications, and broadcast-type services. Layered-division-multiplexing (LDM) is a novel non-orthogonal multiplexing technology recently adopted by the next generation digital TV broadcast system, ATSC 3.0, which is capable of providing significant capacity improvement when delivering multiple broadcast services simultaneously. This article explores the application of LDM as an enabling technology for 5G to achieve high-efficiency P2MP transmission and to deliver more diversified broadcast-type services using the mobile broadband infrastructure. The potential advantages that can be offered by LDM are demonstrated by capacity analysis and computer simulations. Coverage studies show that a 5G P2MP subsystem with LDM can deliver high-quality broadcast services using the broadband infrastructure. Finally, some general guidelines on the receiver implementation are presented to minimize the hardware complexity of consumer devices. © 2018 IEEE.

Source title: IEEE Communications Magazine

DOI : 10.1109/MCOM.2018.1700657

Series Number: Volume 56, Issue 3

Link: Layered-Division Multiplexing: An Enabling Technology for Multicast/Broadcast Service Delivery in 5G

Zhang L., Wu Y., Li W., Salehian K., Laflèche S., Wang X., Park S.I., Kim H.M., Lee J.-Y., Hur N., Angueira P., Montalbán J.
Point-to-Multipoint Communications and Broadcasting in 5G

Year: 2018

Abstract: [No abstract available]

Source title: IEEE Communications Magazine

DOI : 10.1109/MCOM.2018.8316771

Series Number: Volume 56, Issue 3

Link: Point-to-Multipoint Communications and Broadcasting in 5G

Wu H.-C., Akamine C., Rong B., Velez M., Wang C., Wang J.
Using flow cost to globally allocate and optimize limited bandwidth in multipath routing

Year: 2018

Abstract: This paper studies a globally-aware optimization scheme for the allocation of limited bandwidth in a wireless ad hoc network using multipath routing. We assign a FC (Flow Cost) as a function of end-to-end delay, power consumption and hop distance so that we can select the best subset of multiple paths. Using the FC allows us to consider not only the current local transmission, but also any global transmissions from other parts of the network that converge at a CN (Crowded Node), hence providing an effective bandwidth allocation scheme for our multipath routing. In order to improve the routing discovery efficiency, we have proposed the HCZ (Half-Circle Zone) scheme along with node-disjoint sorting to cut down the size of the RPT (Routing Path Table). Utilization factor is also used in the objective function of the optimization in order to take queueing performance into account. Some allocation evaluation by AIMMS (Advanced Integrated Multidimensional Modeling Software) is provided to demonstrate the capability of this algorithm. Implementation, simulation and performance evaluations/comparisons in Opnet 14.5 have been carried out based on the optimization results. © 2017 Elsevier B.V.

Source title: Computer Networks

DOI : 10.1016/j.comnet.2017.12.009

Series Number: Volume 132, 26 February 2018

Link: Using flow cost to globally allocate and optimize limited bandwidth in multipath routing

He J., Yang O., Zhou Y.
Spectrum sharing opportunities in land mobile radio bands: A data-driven approach

Year: 2018

Abstract: In this paper, measurements from a spectrum monitoring system are used to investigate sharing scenarios in Land Mobile Radio (LMR) bands. Specifically, channel characteristics which demonstrate sharing opportunities in the time domain in the 450 and 800 MHz LMR bands are presented. Based on the spectrum data, network simulations are conducted to evaluate system performance impacts when the sharing opportunities are exploited to improve spectrum utilization. The results provide improved understanding of appropriate spectrum use models to use for capturing sharing performance in LMR scenarios. It is shown that intelligent spectrum access mechanisms are needed to achieve the best performance trade-offs among utilization efficiency, access delay and airtime. © 2017 Crown.

Source title: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

DOI : 10.1109/PIMRC.2017.8292714

Series Number: Volume 2017-October, 14 February 2018

Link: Spectrum sharing opportunities in land mobile radio bands: A data-driven approach

Rutagemwa H., Baddour K.E., Ghasemi A.
A cloud-based spectrum environment awareness system

Year: 2018

Abstract: This work presents a cloud-based and bigdata analytics enabled Spectrum Environment Awareness (SEA) system, including its architecture and an initial system prototype. Consisting of heterogeneous and ubiquitous spectrum sensors with learning capabilities, the SEA system aims to characterize, detect and predict the spectrum usage behavior to improve and eventually automate the spectrum regulation and management functions. The paper also describes the spectrum analytics capabilities of the prototype. As an IoT big data application system, SEA engenders a key component in the future spectrum management paradigm. © 2017 Crown.

Source title: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

DOI : 10.1109/PIMRC.2017.8292378

Series Number: Volume 2017-October, 14 February 2018

Link: A cloud-based spectrum environment awareness system

Li L., Boudreau D., Paiement R., Labbe I., Patenaude F., Chahine P., Wang M., Brouillette P.
A novel probabilistic path loss model for simulating coexistence between 802.11 and 802.15.4 networks in smart home environments

Year: 2018

Abstract: In this paper, experimental measurements of the received signal strength in a smart home test bed are presented. The measurements are used to develop a topology-independent probabilistic indoor path loss model. The proposed path loss model adds a random loss component to the log-distance path loss model to account for wall penetration, reflection, scattering, and diffraction effects. The proposed model is incorporated into the network simulator ns-3 to simulate IEEE 802.11 and IEEE 802.15.4 networks. Our results indicate that the throughput of both networks degrades as the density of the nodes increases due to increasing the connectivity of the interference links. © 2017 IEEE.

Source title: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

DOI : 10.1109/PIMRC.2017.8292343

Series Number: Volume 2017-October, 14 February 2018

Link: A novel probabilistic path loss model for simulating coexistence between 802.11 and 802.15.4 networks in smart home environments

El-Keyi A., Sokun H.U., Nguyen T.N., Ye Q., Zhu H.J., Yanikomeroglu H.
Enabling LTE emulation by integrating CORE emulator and LTE-EPC Network (LENA) Simulator

Year: 2018

Abstract: Long Term Evolution (LTE) is a strong candidate for the next generation of Mission-Critical Networks (MCNs) for public safety and military use. However, extensive investigation on different operating scenarios has to be done before adopting LTE. Emulating LTE networks is the best solution to provide the needed insights to the regulators so that they can make informed decisions. In this paper, we integrate LTE-EPC Network simulator (LENA) module with the Common Open Research Emulator (CORE) in order to enable the emulation of large-scale LTE networks. The developed tool bridges the real and the simulated worlds by allowing us to connect real devices to simulated devices and passing traffic to the simulated world from the real world and vice versa. Using this tool, mission-critical scenarios could be investigated in a cost effective way. © 2017 Crown.

Source title: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

DOI : 10.1109/PIMRC.2017.8292642

Series Number: Volume 2017-October, 14 February 2018

Link: Enabling LTE emulation by integrating CORE emulator and LTE-EPC Network (LENA) Simulator

Sabbah A., Jarwan A., Issa O., Ibnkahla M.
Simulating large-scale networks for public safety: Parallel and distributed solutions in NS-3

Year: 2018

Abstract: Due to the critical importance of Public Safety Networks (PSNs), they must have regular on-site performance evaluation. Conducting tests on real systems are expensive in terms of money, efforts, resources, and time. On the other hand, simulation and emulation tools are very important in the design and modeling of engineering systems. They can play a significant role in reducing the high expenses of such periodic tests. NS-3 is a widely used network simulator with a lot of capabilities. However, simulating realistic and large-scale PSNs reveals many limitations in the performance of simulation and urges for methods to speedup the simulations. Despite the exerted efforts in creating distributed simulators, less work that targets wireless networks is done. In this paper, we survey the different methods to enhance the simulation performance including parallel and distributed solutions in the PSN context. We also propose a framework to evaluate and test PSNs in real-time manner. This paper opens the door for future work in achieving better simulations, in terms of reliability and consumed time, for PSNs' large-scale networks. © 2017 IEEE.

Source title: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

DOI : 10.1109/PIMRC.2017.8292761

Series Number: Volume 2017-October, 14 February 2018

Link: Simulating large-scale networks for public safety: Parallel and distributed solutions in NS-3

Al-Shiab I., Sabbah A., Jarwan A., Issa O., Ibnkahla M.
New spectrum utilization efficiency metrics for coexistence and spectrum sharing applications

Year: 2018

Abstract: In this paper, novel spectrum utilization efficiency (SUE) metrics are proposed for coexistence and spectrum sharing applications. A new SUE definition is formulated for each individual system, which, unlike the traditional SUE metrics, takes into account the impact of spectrum resource utilization efficiency in time, bandwidth and space. Then, new SUE metrics are proposed for spectrum sharing application, which combine the metrics of the systems that share the spectrum. The new SUE metrics not only consider the overall spectrum utilization by the systems, but also include their coexistence conditions in sharing the spectrum. Finally, computer simulation studies are carried out using the WLAN (Wireless Local Area Network) and LTE-U (Long Term Evolution in Unlicensed band) coexistence scenario to demonstrate the effectiveness of the proposed metrics. © 2017 IEEE.

Source title: IEEE Vehicular Technology Conference

DOI : 10.1109/VTCFall.2017.8287983

Series Number: Volume 2017-September, 8 February 2018

Link: New spectrum utilization efficiency metrics for coexistence and spectrum sharing applications

Zhou Y.
A globally optimal solution to maximum likelihood bearing-only geolocation

Year: 2018

Abstract: In this paper, an optimization technique is developed for providing the globally optimal solution to the maximum likelihood (ML) method for the bearing-only geolocation problem. The ML formulation does not require the a priori knowledge of the distances between the sensor and the emitter. It is formulated as a non-concave fractional programming problem, and a branch and bound algorithm is developed for solving for the globally optimal solution. The algorithm has the property of global convergence and the advantage of computational efficiency. Computer simulations are used to demonstrate the performance of the proposed techniques and comparisons to other methods and the Cramer-Rao lower bounds (CRLBs) are also provided. © 2017 IEEE.

Source title: IEEE Vehicular Technology Conference

DOI : 10.1109/VTCFall.2017.8288255

Series Number: Volume 2017-September, 8 February 2018

Link: A globally optimal solution to maximum likelihood bearing-only geolocation

Zhou Y.
Measurement-based path loss and delay spread propagation models in VHF/UHF bands for IoT communications

Year: 2018

Abstract: Internet of Things (IoT) holds a great promise in providing autonomous and ubiquitous connectivity between devices in future communication systems. Due to the spectrum scarcity, very high frequency (VHF) and ultra high frequency (UHF) bands are viewed as valuable resources for IoT communications, especially to connect to distant locations that are hard to reach using higher frequencies. Existing propagation models in the VHF/UHF frequency bands are mainly for broadcasting and cellular systems with high transmit antenna heights, and hence, they are not suitable for IoT communications characterized by low antenna heights at both the transmitter and receiver. In this paper, we present new statistical path loss and delay spread models for IoT communications based on quasi-simultaneous wideband channel measurements conducted in the VHF/UHF frequency bands (from 37.8 to 370 MHz) at the city of Halifax, Canada. In particular, we present two log-distance path loss models (frequency-independent path loss exponent and frequencydependent path loss exponent), as well as, a new statistical distribution of the delay spread. © 2017 IEEE.

Source title: IEEE Vehicular Technology Conference

DOI : 10.1109/VTCFall.2017.8287901

Series Number: Volume 2017-September, 8 February 2018

Link: Measurement-based path loss and delay spread propagation models in VHF/UHF bands for IoT communications

Bedeer E., Pugh J., Brown C., Yanikomeroglu H.
Ensuring reliable and stable communications in mobile Ad-hoc networks

Year: 2018

Abstract: To adapt with the frequent link failures in mobile ad-hoc networks, the routing protocols shall catch more than one route, at least two routes. In case of two routes, the first route can be used as the main route; while the other one can be used as a standby route used upon the detections of link failures. If this is the case, the packet losses are virtually decreased to zero, and seamless multimedia communications can be supported over mobile ad-hoc networks. To ensure the existence of two routes between any randomly chosen two nodes, the node density in terms of the number of neighbors must be above a certain threshold. In this paper, we propose a mathematical model to find such node density, and propose some solutions in case the node density is below the required density in order to increase it to the required node density. Our results show that the probability to have two routes rapidly increases with node density till it reaches the saturation region, where the increase of node density has negligible improvement in terms of network availability. This paper shows that the network nodes must have at least 16 neighbors in order to ensure the existence of two routes between any randomly chosen source and destination pair. © 2017 IEEE.

Source title: IEEE Vehicular Technology Conference

DOI : 10.1109/VTCFall.2017.8288132

Series Number: Volume 2017-September, 8 February 2018

Link: Ensuring reliable and stable communications in mobile Ad-hoc networks

Hayajna T., Kadoch M., Rong B.
A novel opportunistic NOMA scheme for 5G massive MIMO multicast communications

Year: 2018

Abstract: This paper concentrates on the multicast service in the next generation (5G) communications system, and develops an opportunistic massive MIMO-NOMA scheme. The proposed scheme superimposes the signal of Non-orthogonal Multiple Access (NOMA) users on the multicast signal, and employs successive interference cancellation (SIC) to separate the signal of NOMA users from the multicast signal. This scheme also applies null space based interference cancellation to eliminate the signal leakage generated by other groups. And multi-user MIMO (MU-MIMO) linear precoding is employed in the unicast group. Numerical results revealed that opportunistic massive MIMONOMA system significantly satisfies the requirement of high peak spectral efficiency in typical massive MIMO scenarios. © 2017 IEEE.

Source title: IEEE Vehicular Technology Conference

DOI : 10.1109/VTCFall.2017.8288398

Series Number: Volume 2017-September, 8 February 2018

Link: A novel opportunistic NOMA scheme for 5G massive MIMO multicast communications

Xiao K., Dai S., Rutagemwa H., Rong B., Gong L., Kadoch M.
X -Band Circularly Polarized Electronically Steerable Parasitic Array Radiator of DRA

Year: 2018

Abstract: In this paper, an X -band electronically steerable parasitic array radiator (ESPAR) of circularly polarized dielectric resonator antennas (CP-DRAs) is proposed. The array consists of one driven CP-DRA coupled to four parasitic CP-DRAs. The parasitic elements are placed adopting a sequential rotation approach and are terminated by tunable varactors to steer the beam into the desired direction. The proposed CP-ESPAR technique eliminates the need of expensive phase shifters, which significantly reduces cost and fabrication complexity. For performance evaluation, a prototype of the proposed antenna is designed, fabricated, and measured. It is observed that the proposed antenna has a monotonic CP beam scanning from -22° to 22° operating at 10.5 GHz. In addition, the peak value of the realized gain is 6.6 dBic with 0.9 dB variation within the entire scanning range. © 1963-2012 IEEE.

Source title: IEEE Transactions on Antennas and Propagation

DOI : 10.1109/TAP.2017.2780895

Series Number: Volume 66, Issue 2

Link: X -Band Circularly Polarized Electronically Steerable Parasitic Array Radiator of DRA

Movahedinia R., Sebak A.-R., Chaharmir M.R., Ranjbar Nikkhah M., Kishk A.A.
Control channel selection techniques in cognitive radio networks: A comparative performance analysis

Year: 2018

Abstract: Cognitive radio (CR) technology offers a promising solution to the spectrum scarcity problem via dynamic spectrum access (DSA). Due to the nature of cooperative cognitive radio networks (CRNs), where two distinct networks are active simultaneously, a significant amount of control messaging is required in order to coordinate channel access, schedule sensing, and establish and release connections. Efficient control plane messaging can be achieved by the selection of an appropriate control channel (CC). Major selection strategies of CCs are categorized as either dedicated or dynamic strategies. This paper studies the major potential techniques for selecting reliable CCs for coordination and information distribution in license-exempt (LE) bands. This involves determining the potential and limitations of each technique in terms of availability, complexity, and robustness. We consider real-life scenarios including an outdoor stadium and an indoor environment. Recommendations are given for different situations. © 2011 KICS.

Source title: Journal of Communications and Networks

DOI : 10.1109/JCN.2018.000006

Series Number: Volume 20, Issue 1

Link: Control channel selection techniques in cognitive radio networks: A comparative performance analysis

Sabbah A., Ibnkahla M., Issa O., Doray B.
A ku-band distributed SPDT switch in 0.5 m AlGaN/GaN HEMT technology

Year: 2018

Abstract: In this paper, a wideband single-pole double-throw (SPDT) switch using the traveling-wave concept was demonstrated. Realized in 0.5 m AlGaN/GaN HEMT process, it achieves good performance at Ku-band despite the process being intended for low-frequency applications. This type of switch combined the off-state shunt transistors and series coplanar waveguide (CPW) lines to form an artificial transmission line. CPW is also used to eliminate parasitics associated with through-substrate microstrip vias and coupling of adjacent transmission lines. An accurate switch HEMT model was extracted and used in the design. A 9–25 GHz single-pole double-throw (SPDT) switch in conjunction with quarter-wavelength impedance transformers demonstrates an insertion loss of less than 6 dB, return loss better than 10 dB and an isolation of better than 25 dB. © 2018 Wiley Periodicals, Inc.

Source title: Microwave and Optical Technology Letters

DOI : 10.1002/mop.30987

Series Number: Volume 60, Issue 2

Link: A ku-band distributed SPDT switch in 0.5 m AlGaN/GaN HEMT technology

Zaibet I., Hettak K., Yagoub M.C.E.
Capacity Enhancement for Next Generation Mobile Networks Using mmWave Aerial Base Station

Year: 2018

Abstract: The increasing traffic puts high demands on capacity for the next generation mobile networks. The millimeter-Wave (mmWave) communication system offers new opportunities to meet this requirement due to the tremendous amount of available spectrum. However, the massive non-line-of-sight (NLOS) transmissions and the site constraints in urban environment are severely challenging the conventional way of deploying terrestrial low power nodes (LPNs). To address these problems, we introduce the mmWave aerial base station (mAeBS) in next generation mobile networks, which can be quickly and flexibly deployed to enhance the capacity in data traffic bursting areas. To maximize the enhancing effects, an ergodic capacity analytical model of mAeBS is proposed, considering both user distribution and environment conditions. Then an mAeBS 3D placement method based on the model is given. Simulation results show that the proposed method can achieve considerable capacity enhancement and supplement regional coverage as well. © 2017 IEEE.

Source title: 2017 IEEE Global Communications Conference, GLOBECOM 2017 - Proceedings

DOI : 10.1109/GLOCOM.2017.8254734

Series Number: Volume 2018-January, 10 January 2018

Link: Capacity Enhancement for Next Generation Mobile Networks Using mmWave Aerial Base Station

Zhang T., Zhou F., Feng L., Yu P., Li W., Rong B., Rutagemwa H.
An efficient routing and interface assignment algorithm for multi-channel multi-interface (MCMI) Ad Hoc networks

Year: 2018

Abstract: In this paper, a routing and interface assignment algorithm is proposed for MCMI wireless ad hoc networks. The algorithm consists of two steps: route selection and interface assignment. The process of route selection is to find the path with the minimum lower bound while the interface assignment is to assign the interfaces on the nodes along the path based on the application of the Viterbi algorithm. The proposed algorithm is computationally efficient due to the decoupling of the route selection and interface assignment processes. Computer simulation and examples are used to demonstrate the effectiveness and performance of the proposed technique. Comparisons are made to other existing routing techniques in the area of dynamical spectrum access. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

Source title: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST

DOI : 10.1007/978-3-319-74439-1_12

Series Number: Volume 223 LNICST, 2018

Link: An efficient routing and interface assignment algorithm for multi-channel multi-interface (MCMI) Ad Hoc networks

Zhou Y.
Broadband polarization conversion metasurface for RCS reduction

Year: 2018

Abstract: A very wideband reflective polarization rotator (PR) unit-cell with a high polarization conversion ratio (PCR) is proposed. An air gap is applied between ground plate and substrate to improve polarization conversion. The proposed unit-cell and associated mirror are applied to the chessboard-like rectangular structure to produce destructive interference in far-field. As a result, 10-dB radar cross section (RCS) reduction over wide bandwidth of about 112% with center frequency of 10 GHz is achieved. The proposed reflective PR metamaterial provides a more efficient and reliable structure for very wideband RCS reduction purposes. © Institution of Engineering and Technology.All Rights Reserved.

Source title: IET Conference Publications

Series Number: Volume 2018, Issue CP741

Link: Broadband polarization conversion metasurface for RCS reduction

Samadi F., Akbari M., Chaharmir R., Sebak A.R.
Broadband linear polarization conversion metasurface based on grounded vias

Year: 2018

Abstract: An anisotropic high-impedance surfaces is applied to achieve perfect polarization rotation. Three multiple resonances are generated by electric and magnetic resonances which contributed to bandwidth expansion of the proposed polarization converter. The simulation results showed that maximum conversion efficiency is nearly 100% at mentioned three resonance frequencies. Here, 107 % bandwidth with polarization conversion ratio of above 90% is achieved. The proposed polarization conversion unit-cell is examined for oblique incidence, as well. It is observed that the bandwidth of the proposed unit-cell is not sensitive to the non-orthogonal incidence angles up to 40. This observation verifies applicability of proposed polarization rotator unit-cell. © Institution of Engineering and Technology.All Rights Reserved.

Source title: IET Conference Publications

Series Number: Volume 2018, Issue CP741

Link: Broadband linear polarization conversion metasurface based on grounded vias

Samadi F., Akbari M., Chaharmir R., Sebak A.R.
Evaluation of a location reporting system for mmWave communication

Year: 2018

Abstract: This paper presents a sampling alignment data processing (SADP) methodology for un-synchronized data to evaluate the precision and accuracy of a positioning system (the Google Tango system); this location system is used to control beams of directional antennas for a 5th generation communication system using millimeter Wave (mmWave) links. The test mathematical model is described in details to derive the sampling alignment data processing. The SADP is used to evaluate the indoor and outdoor scenarios for the Google Tango position system, and we conclude that the Tango system precision is impacted by the tester's behaviors, environment characteristics, and weather conditions. The evaluation results show the suitability of the Tango system as a location reporting system for our mmWave communication system. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

Source title: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST

DOI : 10.1007/978-3-319-74439-1_16

Series Number: Volume 223 LNICST, 2018

Link: Evaluation of a location reporting system for mmWave communication

Fang Y., Tsang W., Doray B., Huang Y.
Preface

Year: 2018

Abstract: [No abstract available]

Source title: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST

Series Number: Volume 223 LNICST, 2018

Link: Preface

Zhou Y., Kunz T.
Line defect-layered EBG waveguides in dielectric substrates

Year: 2018

Abstract: A dielectric-based multilayer structure composed of U-shaped rings (ML-UR) is used to develop a class of novel electromagnetic band gap (EBG) slab waveguide. The structure has two band gaps that narrow down as dielectric constant is increased. The EBG slab waveguide is created by embedding a single-layer line defect inside the 3D crystal of the EBG slab guide. Unlike our previously published foam-based EBG structure, the use of dielectric spacer in the EBG waveguides offers significant advantages in terms of overall size, structure reliability, and design flexibility. The waveguide structures reported in this paper are designed to operate at X-band (8-12 GHz) while being fed by coplanar-slotline transitions. Prototypes were fabricated and characterized experimentally. The insertion loss decreases by decreasing the number of full lattices of ML-UR surrounding the channels. The proposed waveguide has potential in microwave components such as directional couplers, phase shifters, and antenna array feeding networks. © 2018 Hassna Ouassal et al.

Source title: International Journal of Antennas and Propagation

DOI : 10.1155/2018/3469730

Series Number: Volume 2018, 2018, Article number 3469730

Link: Line defect-layered EBG waveguides in dielectric substrates

Ouassal H., Shaker J., Roy L., Hettak K., Chaharmir R.
Emerging Technologies for 5G Radio Access Network: Architecture, Physical Layer Technologies, and MAC Layer Protocols

Year: 2018

Abstract: [No abstract available]

Source title: Wireless Communications and Mobile Computing

DOI : 10.1155/2018/6082161

Series Number: Volume 2018, 2018, Article number 6082161

Link: Emerging Technologies for 5G Radio Access Network: Architecture, Physical Layer Technologies, and MAC Layer Protocols

Rong B., Zhou J., Kadoch M., Sun G.-L.
Performance Analysis of All Modulation and Code Combinations in ATSC 3.0 Physical Layer Protocol

Year: 2018

Abstract: This paper presents the advanced television systems committee (ATSC) 3.0 physical layer system performances with different modulation and channel coding combinations. Numerous computer simulations, laboratory tests, and field trials are conducted under additive white Gaussian noise, RC20, and RL20 channels. Analysis of the results shows that the measured values in laboratory and field are less than 1 dB away from computer simulation results. This confirms that the ATSC 3.0 physical layer is capable of providing services ranging from ultra-robust reception (negative SNR operation with QPSK and 2/15 low density parity check (LDPC) code) to very high-throughput (over 50 Mb/s with 4096-non-uniform constellation and 13/15 LDPC code) in real field environments. IEEE

Source title: IEEE Transactions on Broadcasting

DOI : 10.1109/TBC.2018.2871372

Link: Performance Analysis of All Modulation and Code Combinations in ATSC 3.0 Physical Layer Protocol

Park S., Lee J., Kwon S., Lim B., Ahn S., Kim H.M., Jeon S., Lee J., Simon M., Aitken M., Gage K., Wu Y., Zhang L., Li W., Kim J.