Scientific publications—2020

 

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.

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Research publications—2020
Title Authors
Using Non-Orthogonal Multiplexing in 5G-MBMS to Achieve Broadband-Broadcast Convergence with High Spectral Efficiency

Year: 2020

Abstract: The development of 5G system provides a unique opportunity to implement a unified wireless transmission platform that can simultaneous deliver unicast, multicast and broadcast services using the same spectrum and the same infrastructure. This can be achieved by developing a more capable point-to-multipoint transmission (PTM) system component, also called 5G Multimedia Broadcast Multicast Services (5G-MBMS). A properly designed 5G-MBMS could achieve the convergence of terrestrial mobile broadband and TV broadcasting systems. By inherently allowing dynamic spectrum allocation among different types of services, this converged system could offer significant higher spectrum utilization. In this paper, the power-based non-orthogonal multiplexing (P-NOM) technology is proposed in addition to the existing orthogonal time-division-multiplexing (TDM) scheme. Significant capacity gains could be achieved by using P-NOM in a 5G-MBMS system for delivering different types of broadcast services, and for delivering mixed unicast and broadcast services. The capacity benefits of a 5G-MBMS with P-NOM is demonstrated by both theoretical analysis and computer simulations. A key finding is that using a two-layer P-NOM can essentially deliver a broadcast service on top of a unicast network, each achieving nearly full capacity. Next, a complexity analysis will reveal that implementing P-NOM in a 5G-MBMS system does not require significant additional complexity at consumer devices. Finally, it will be shown that, different from the non-orthogonal-multiple-access (NOMA) technologies, using P-NOM in 5G-MBMS system requires little or no change to the existing radio resource allocation mechanisms in LTE and 5G, when one power layer is used for broadcast services delivery. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

DOI : 9069433

Series Number: Vol.66, issue2

Link: Using Non-Orthogonal Multiplexing in 5G-MBMS to Achieve Broadband-Broadcast Convergence with High Spectral Efficiency

Zhang L., Li W., Wu Y., Xue Y., Sousa E., Park S.-I., Lee J.-Y., Hur N., Kim H.-M.
Using NOMA for Enabling Broadcast/Unicast Convergence in 5G Networks

Year: 2020

Abstract: This paper addresses the challenge of broadcast and unicast convergence by proposing a PHY/MAC (Physical Layer/Medium Access Control) architecture for 5G New Radio (NR). The solution is based on Power domain Non Orthogonal Multiple Access (P-NOMA). The main PHY/MAC configuration parameters have been analyzed theoretically and their impact on the service configurations is presented in this manuscript. The system concept has been translated into a prototype model and different evaluation tests are presented. First, simulations show that the PHY layer performs better than Time Division Multiplexing/Frequency Division Multiplexing (TDM/FDM) choices of current broadband access systems. Second, performance tests using a network simulation tool are described. The results for capacity, latency and reliability demonstrate that the proposed solution offers an excellent broadcast/unicast convergence choice with significant gain values with respect to legacy PHY/MAC alternatives. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

DOI : 9067029

Series Number: Vol.66, issue2

Link: Using NOMA for Enabling Broadcast/Unicast Convergence in 5G Networks

Iradier E., Montalban J., Fanari L., Angueira P., Zhang L., Wu Y., Li W.
Enhancements on Coding and Modulation Schemes for LTE-Based 5G Terrestrial Broadcast System

Year: 2020

Abstract: Broadcasting and broadband network is moving towards integration and LTE-based 5G terrestrial broadcast is now researched in Release 16 in Third Generation Partnership Project (3GPP) standardization meetings. However, the work scope of LTE-based 5G terrestrial broadcast focuses on specifying new numerologies and some minor improvement on cell acquisition subframe, which is insufficient. In this paper, limitations in coding and modulation schemes of LTE-based 5G terrestrial broadcast system, e.g., Turbo codes and Quadrature Amplitude Modulation (QAM), are detailedly analyzed. To further enhance the spectrum efficiency of LTE-based 5G terrestrial broadcast system, LDPC (Low Density Parity Check) codes from 5G new radio (NR) standard and newly designed non-uniform constellations (NUCs) are adopted in this paper to replace Turbo codes and QAM respectively. Extensive simulations and complexity analysis show that the proposed LDPC coding and NUC modulation scheme, either standalone or combined, can provide significant performance gain over Additive White Gaussian Noise (AWGN) and Tapped Delayline (TDL) channels, without additional complexity. To summarize, this paper investigates the weakness of the coding and modulation schemes in current systems and provides potential alternatives for the enhanced future broadcast in 3GPP standard. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

DOI : 9056461

Series Number: Vol.66, issue2

Link: Enhancements on Coding and Modulation Schemes for LTE-Based 5G Terrestrial Broadcast System

Xu Y., Gao N., Hong H., Cai Y., Duan X., He D., Wu Y., Zhang W.
Electronic Beam Scanning Leaky-Wave Antenna Based on Delta Shape Half-Mode Substrate Integrated Waveguide

Year: 2020

Abstract: A novel reconfigurable leaky-wave antenna is presented in this paper. The proposed antenna is based on a half-mode substrate integrated waveguide. The beam-steering is achieved using novel cells. The effective surface impedance can be changed by configuring the cells. Sweeping the bias voltage causes variations of the phase constant which leads to electronic beam-scanning. The operating frequency is chosen as 28.5 GHz in the support of upcoming 5G communications systems. The length, width, and height of the antenna are 67 mm, 45 mm, and 0.3 mm, respectively. To achieve an optimal response, cells are located in the delta configuration. Electronic beam-scanning capability, compactness, and high gain of the proposed antenna make it a suitable candidate for future 5G wireless networks. © 2020 EurAAP.

Source title: 14th European Conference on Antennas and Propagation, EuCAP 2020

DOI : 9135341

Series Number:

Link: Electronic Beam Scanning Leaky-Wave Antenna Based on Delta Shape Half-Mode Substrate Integrated Waveguide

Javanbakht N., Syrett B., Amaya R.E., Shaker J.
Quasi-Cyclic Spatially Coupled LDPC Code for Broadcasting

Year: 2020

Abstract: Flexible and robust transmission schemes are required to support different coded modulation modes, receiver types and channel conditions in future broadcasting systems. However, conventional low-density parity-check (LDPC) coded schemes are usually optimized towards particular scenario, and may face the problem of performance degradation in other different scenarios. In this paper, a type of quasi-cyclic spatially coupled LDPC (QC-SC-LDPC) codes, which have been recently proven to be able to universally achieve capacity over different channels under conventional belief propagation decoding, are proposed as the forward error correcting codes for broadcasting applications. Then a QC-SC-LDPC coded transmission scheme is proposed, which is capable of showing good performance in various scenarios under practical constraints of finite coupling length, smoothing parameter, uncoupled code length and number of decoding iterations. To maintain the universal property under the above constraints, a typical construction method is developed, based on which a QC-SC-LDPC code is constructed as an example. Finally, the performance and robustness of the proposed QC-SC-LDPC coded transmission scheme are demonstrated via simulations under different yet typical coded modulation modes and channel conditions. © 1963-12012 IEEE.

Source title: IEEE Transactions on Broadcasting

DOI : 8798970

Series Number: Vol.66, issue 1

Link: Quasi-Cyclic Spatially Coupled LDPC Code for Broadcasting

Zhang Y., Peng K., Song J., Wu Y.
Robust Modulation Classification over -Stable Noise Using Graph-Based Fractional Lower-Order Cyclic Spectrum Analysis

Year: 2020

Abstract: This paper introduces a novel automatic modulation classification (AMC) method using the graph-based fractional lower-order cyclic-spectrum analysis in the -stable noise environment. The noise in the practical communication scenario usually exhibits impulse characteristics in the statistical sense, which could be modeled as the -stable distribution. This would make the second- or higher-order statistics of the received signal vanish, and thus the performances of the conventional AMC algorithms designed for Gaussian noise significantly deteriorate when directly employed in the -stable noise. In our proposed framework, the fractional lower-order cyclic spectrum (FLOCS) analysis is first invoked to acquire the polyspectra of the signal corrupted by the -stable noise. Then, the graph-based AMC mechanism is systematically established upon the graph representation of the FLOCS to identify the modulation type according to the discrepancies between the graph features derived from the training and test data. The performance of our proposed new algorithm is theoretically analyzed, and the correct classification probability Pcc over the modulation candidate set is formulated analytically. The remarkable scalability and efficiency of our proposed approach for the modulation candidate set variation are also theoretically investigated in detail. Monte Carlo simulation results demonstrate the effectiveness and superiority of the proposed AMC scheme. © 1967-2012 IEEE.

Source title: IEEE Transactions on Vehicular Technology

DOI : 8954676

Series Number: Vol.69, issue 3

Link: Robust Modulation Classification over -Stable Noise Using Graph-Based Fractional Lower-Order Cyclic Spectrum Analysis

Yan X., Liu G., Wu H.-C., Zhang G., Wang Q., Wu Y.
Deterministic Modeling of Indoor Stairwells Propagation Channel

Year: 2020

Abstract: A deterministic approach is presented for modeling a wireless propagation channel in a stairwell environment. The ray-tracing method is used to find the reflected and diffracted rays with the highest contribution to the total received power at a given location. Most significant reflected rays occur at the surfaces of specific steps of the stairwell and the surrounding lateral walls, while most significant diffracted beams emanate from the edges of steps located between transmitter and receiver antennas. The uniform theory of diffraction is used to calculate the diffracted contributions from the edges, whereas the multiple diffractions are calculated using heuristic diffraction coefficients. Unlike the reported models, the proposed model is deterministic and focuses on the radio propagation within stairwells at the X-band frequencies range. Experimental validation is performed using two types of antennas, horns and patches, for an operating frequency of 10 GHz. Simulated results of narrowband and wideband radio channels showed a good agreement with the experimental ones. The correlation coefficient between measured and simulation results is around 80% on average, and the residual errors between measured and simulated total received power results are less than 13%, which means that the proposed model has fair accuracy for such complex environments. © 2002-2011 IEEE.

Source title: IEEE Antennas and Wireless Propagation Letters

DOI : 8939452

Series Number: Vol.19, issue 2

Link: Deterministic Modeling of Indoor Stairwells Propagation Channel

Fono V.A., Talbi L., Safia O.A., Nedil M., Hettak K.
Integration of 5G Networks and Internet of Things for Future Smart City

Year: 2020

Abstract: [No abstract available]

Source title: Wireless Communications and Mobile Computing

DOI : 2903525

Series Number: 2020

Link: Integration of 5G Networks and Internet of Things for Future Smart City

Rong B., Han S., Kadoch M., Chen X., Jara A.
Using Layered Division Multiplexing for Wireless In-Band Distribution Links in Next Generation Broadcast Systems

Year: 2020

Abstract: To meet the ever increasing demand for better service quality and availability, the next generation digital TV (DTV) broadcast, a.k.a., the ATSC 3.0, is developed with new capabilities to deliver 4K ultra-high-definition (4K-UHD) services to fixed receivers, robust HD-quality services to mobile receivers, as well as non-broadcast services (e.g., broadband), including Internet of Things (IoT), Connected Vehicles, etc. To realize these capabilities, it becomes necessary to evolve the existing single-transmitter high-power-high-tower (HPHT) network to multi-transmitter low-power-low-tower single-frequency-networks (SFN), which requires installing new transmitters. Each new transmitter needs a feederlink to receive the service data from the broadcast gateway (BG) for transmission. This feederlink contributes to a significant portion of installation and operational costs of the new transmitters. This paper proposes a wireless in-band distribution link (WIDL) technology, where the distribution data is delivered to the newly deployed transmitters from the existing DTV towers wirelessly sharing the same TV band with the broadcast services. The distribution signal is multiplexed with service signal in the same ATSC 3.0 waveform. Layered division multiplexing (LDM) technology is proposed to achieve more efficient transmission of the distribution signal. The WIDL offers better performance and more robust operation than the on-channel repeater (OCR) technologies. More importantly, it offers the possibility of delivering backhaul data for future applications over the DTV infrastructure, such as IoT and connected vehicles. Therefore, the proposed WIDL is one enabling technology to achieve convergence of broadcast services with broadband and other wireless services on the DTV spectrum. Crown

Source title: IEEE Transactions on Broadcasting

DOI :

Series Number:

Link: Using Layered Division Multiplexing for Wireless In-Band Distribution Links in Next Generation Broadcast Systems

Zhang L., Li W., Wu Y., Lafleche S., Hong Z., Park S., Lee J., Kim H., Hur N., Iradier E., Angueira P., Montalban J.
Large-Scale Network Analysis on NOMA-Aided Broadcast/Unicast Joint Transmission Scenarios Considering Content Popularity

Year: 2020

Abstract: This paper analyzes reliability and quality gains that can be achieved by a broadcast-unicast convergent platform operating in non-orthogonal multiple access (NOMA)-based cellular networks. The analysis is addressed in network scope, dealing with randomly distributed users and base stations (BSs) within a stochastic geometry framework. Additionally a well-known Zipf-distribution popularity model on user demands is also taken into account, which effectively reflects a broadcasting gain from reducing redundant resource expense toward the users demanding same contents. Based on the stochastic modeling, closed-form delivery success probabilities and the consequent transmission rates are analytically derived, where the derivations are obtained separately for the networks with different access control strategies. Furthermore, the optimal broadcast content selection strategy maximizing the transmission rates is proposed. By means of numerical calculations, NOMA is shown to achieve substantial gain at broadcast/unicast joint transmission compared to the conventional orthogonal multiple access (OMA) network, particularly for the service configuration with popular contents having lower target service rates than less popular contents as long as the number of broadcast programs is restricted to be equal to the number of unicast services in a single frame. IEEE

Source title: IEEE Transactions on Broadcasting

DOI :

Series Number:

Link: Large-Scale Network Analysis on NOMA-Aided Broadcast/Unicast Joint Transmission Scenarios Considering Content Popularity

Ahn S., Park S., Lee J., Hur N., Wu Y., Zhang L., Li W., Kim J.
Generative adversarial networks in designing electromagnetic engineered surfaces for mm-wave band spectrum environments

Year: 2020

Abstract: AIM: In this paper, we set out to understand the capabilities of conditional generative adversarial networks (cGANs) in the generation of electromagnetic engineered surfaces (EES). BACKGROUND: As the use of radio spectrum is increasing, one direction to increase the supply is by tapping into available high frequency spectrum and engineer the propagation environment through carefully designed electromagnetic engineered surfaces. Generative models such as GANs, can learn to generate new designs by training on existing dataset but have been traditionally applied in the domains of image processing and text generation. METHODOLOGY: We propose to train a cGAN for EES generation. The cGAN is first tested on the MNIST dataset to ensure convergent training. Next EES transfer functions categories of interest are defined and k-means clustering is used to assign EES designs in our dataset. The cGAN is then trained on the 9x9 EES dataset and its performance is evaluated using several metrics. RESULTS: Our results indicate that the proposed cGAN is able to generate different engineered surface designs given a desired transfer function, improving the accuracy by at least 3 fold compared to a random generation process. CONCLUSION: The application of cGANs on EES shows the applicability of machine learning such as generative models in engineering applications with design constraints. © 2019 Copyright held by the owner/author(s).

Source title: CASCON 2019 Proceedings — Conference of the Centre for Advanced Studies on Collaborative Research — Proceedings of the 29th Annual International Conference on Computer Science and Software Engineering

DOI :  

Series Number:  

Link: Generative adversarial networks in designing electromagnetic engineered surfaces for mm-wave band spectrum environments

Ozyegen O., Ethier J., Kavurmacioglu E., Basar A.
NUC Optimization-Aided Hierarchical Modulation to Achieve Comparable Capacity as Layered Division Multiplexing

Year: 2020

Abstract: This article investigates the non-uniform constellation (NUC) optimization adapted for Hierarchical modulation (HM) without using Successive Interference Cancellation (SIC). This approach is promising to reduce system demod/decode delay in comparison to Layered Division Multiplexing (LDM). By maximizing the constellation constrained capacity of Enhanced Layer (EL) service in HM, while the capacity of Core Layer (CL) service are approximately the same in HM and LDM, the capacity achieved by HM using NUCs is comparable to LDM. Particle Swarm Optimization (PSO) algorithm is used to resolve this problem. To accelerate the optimization, initial constellation is selected from regular NUCs or the combination of CL and EL constellations of LDM in ATSC 3.0. The results imply that under certain capacity demands, especially when there is a large difference between the SNR thresholds of CL and EL or the power ratio of CL to EL is high (for example, 10 dB or higher), HM, with lower delay compared to LDM, can achieve the capacity comparable or even better than LDM with the help of NUCs. Even if the power ratio of CL to EL is relatively low (for example, 3 dB), the capacity loss can be reduced with properly designed NUCs and the SNR threshold loss of EL can be approximately 0.4 dB with respect to LDM. However, LDM is still superior to HM when the difference between the SNR thresholds of CL and EL is relatively low.

Source title: IEEE Transactions on Broadcasting

DOI: 10.1109/TBC.2020.3031728.

Series Number:  

Link: NUC Optimization-Aided Hierarchical Modulation to Achieve Comparable Capacity as Layered Division Multiplexing

L. Liu, Y. Xu, Y. Wu, D. He and W. Zhang
Mobile Performance Evaluation for ATSC 3.0 Physical Layer Modulation and Code Combinations Under TU-6 Channel

Year: 2020

Abstract: This paper presents performance analysis of the Advanced Television Systems Committee (ATSC) 3.0 physical layer protocol in mobile multipath channels. Given the recommended configurations for ATSC 3.0 mobile services, intensive computer simulations as well as laboratory tests are conducted to verify the performance of various modulation and code combinations in ATSC 3.0 physical layer protocol. The results demonstrate that the ATSC 3.0 physical layer can reliably deliver intended mobile services in high-mobility scenarios.

Source title: IEEE Transactions on Broadcasting

DOI: 10.1109/TBC.2019.2954065.

Series Number: Vol. 66, no. 4, pp. 752-769

Link: Mobile Performance Evaluation for ATSC 3.0 Physical Layer Modulation and Code Combinations Under TU-6 Channel

S. Ahn et al.
Backward Compatible Low-Complexity Demapping Algorithms for Two-Dimensional Non-Uniform Constellations in ATSC 3.0

Year: 2020

Abstract: Non-uniform constellation (NUC) is an advanced technology in digital terrestrial television broadcasting (DTTB) systems to reduce the shapping gap of BICM capacity to Shannon theoretical limit and provide performance gain. Two-dimensional NUC (2D-NUC) is a kind of NUC providing more gain but bringing higher demapping complexity at the receiver, which hinders its application prospects, especially in power limited systems. This paper proposes three novel demapping algorithms with reduced complexity for low to medium code rate 2D-NUCs in Advanced Television Systems Committee 3rd Generation (ATSC 3.0) standard. The proposed algorithms are based on the introduction of virtual points, the strategy of condensed symbols reduction and some reasonable approximations. There is a trade-off between the demapping complexity and performance. These three algorithms have different degrees of reduction in complexity and performance degradation, so they accommodate for different practical requirements. Theoretical analysis and simulation results are also given in this paper to prove the efficiency of the proposed demapping algorithms with reduced complexity.

Source title: IEEE Transactions on Broadcasting

DOI: 10.1109/TBC.2020.2985008.

Series Number:  

Link: Backward Compatible Low-Complexity Demapping Algorithms for Two-Dimensional Non-Uniform Constellations in ATSC 3.0

H. Hong, Y. Xu, Y. Wu, D. He, N. Gao and W. Zhang