Rate Compatible Modulation for Non-Orthogonal Multiple Access

Granada, Imanol; Crespo, Pedro M.; Garcia-Frías, Javier

doi:10.1109/access.2020.3043529

Cited by 4 publications

(10 citation statements)

References 31 publications

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“…The parallel RCM-LDGM concatenation has recently been used in the literature [38], [39]. The numerical results presented in [29] and in this work show that both RCM-MAC and RCM-CIS systems inherit the high error floors encountered in RCM This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ This article has been accepted for publication in a future issue of this journal, but has not been fully edited.…”

Section: Introductionmentioning

confidence: 81%

“…RCM-MAC systems were recently proposed in [29] for transmitting λ independent users over a multiple access channel at high sum-rates while maintaining low decoding complexity. The main idea of RCM-MAC systems is to convert a point-to-point RCM code, with weight multi-set W = {w 1 , w 2 , .…”

Section: Extension To Clusters Of Correlated Information Sources mentioning

confidence: 99%

“…Recently, a non-SIC NOMA system, named RCM-MAC, for the transmission of independent sources at high rates over multiple access channels was proposed in [29]. This NOMA system is based on Rate Compatible Modulation (RCM) [30], [31] codes.…”

Section: Introductionmentioning

confidence: 99%

“…This distribution is employed so that the combination of these irregular RCM codes with the channel forms a unique RCM code from the receiver's perspective. In [29] was shown that RCM-MAC systems are able to simultaneously transmit a large number of uncorrelated users at high throughput, while the decoding complexity is the same as that of standard pointto-point RCM codes.…”

Section: Introductionmentioning

confidence: 99%

“…In the last part of this work we utilize the RCM-MAC systems presented in [29] to generalize the proposed RCM-CIS system to the transmission of clusters of correlated information sources. The idea is to generate a mother RCM-MAC system with as many irregular RCM structures as clusters.…”

Section: Introductionmentioning

confidence: 99%

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Rate Compatible Modulation for Correlated Information Sources

et al. 2021

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In this paper we consider the problem of transmitting spatially Correlated Information Sources (CIS) over the Additive White Gaussian Noise (AWGN) Multiple Access Channel (MAC) with transmitted energy constraint. It is well known that the system performance is optimized if the codewords are designed to take advantage of the correlation among sources in the multiple access channel. To that end, we make use of Rate Compatible Modulation (RCM) codes, whose sparse nature is advantageous to preserve the source correlation in the MAC. In order to exploit the source correlation, the proposed RCM-CIS system is comprised of a set of RCM codes that share the same random structure but with each code having its own weight values that are jointly designed. At the receiver, non-binary decoding is applied to avoid short length cycles that arise in the factor graph, which is obtained by jointly considering the source correlation and the RCM codes. Simulation results show that for high throughput transmission rate RCM-CIS has good performance in terms of the BER vs SNR, attaining values below the Shannon limit if source-channel separation is assumed. As shown by the numerical results, the proposed RCM system inherits the high error floors encountered in point-to-point RCM codes. In order to lower the error floor, we propose the use of a Low Density Generation Matrix (LDGM) code in parallel with the proposed RCM structure. The LDGM system transmits a small fraction of the total coded sequence, and it is capable of correcting the residual errors produced by the RCM-CIS system.

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Section: Introductionmentioning

confidence: 81%

Section: Extension To Clusters Of Correlated Information Sources mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rate Compatible Modulation for Correlated Information Sources

et al. 2021

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Software Defined Radio Based Non-orthogonal Multiple Access (NOMA) Systems

Reddy¹,

Mannem²,

Jamal³

2021

Wireless Pers Commun

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Performance Investigation of NOMA Versus OMA Techniques for mmWave Massive MIMO Communications

et al. 2021

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The fifth-generation (5G) of cellular technology is currently being deployed over the world. In the next decade of mobile networks, beyond 5G (B5G) cellular networks with the under-development advanced technology enablers are expected to be a fully developed system that could offer tremendous opportunities for both enterprises and society at large. B5G in more ambitious scenarios will be capable to facilitate much-improved performance with the significant upgrade of the key parameters such as massive connectivity, ultra-reliable and low latency (URLL), spectral efficiency (SE) and energy efficiency (EE). Equipping non-orthogonal multiple access (NOMA) with other key drivers will help to explore systems' applicability to cover a wide variety of applications to forge a path for future networks. NOMA empowers the networks with seamless connectivity and can provide a secure transmission strategy for the industrial internet of things (IIoT) anywhere and anytime. Despite being a promising candidate for B5G networks a comprehensive study that covers operating principles, fundamental features and technological feasibility of NOMA at mmWave massive MIMO communications is not available. To address this, a simulation-based comparative study between NOMA and orthogonal multiple access (OMA) techniques for mmWave massive multiple-input and multiple-output (MIMO) communications is presented with performance discussions and identifying technology gaps. Throughout the paper, aspects of operating principles, fundamental features and technological feasibility of NOMA are discussed. Also, it is demonstrated that NOMA not only has good adaptability but also can outperform other OMA techniques for mmWave massive MIMO communications. Some foreseeable challenges and future directions on applying NOMA to B5G networks are also provided.

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Rate Compatible Modulation for Non-Orthogonal Multiple Access

Cited by 4 publications

References 31 publications

Rate Compatible Modulation for Correlated Information Sources

Rate Compatible Modulation for Correlated Information Sources

Software Defined Radio Based Non-orthogonal Multiple Access (NOMA) Systems

Performance Investigation of NOMA Versus OMA Techniques for mmWave Massive MIMO Communications

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