Polar-Coded Non-Orthogonal Multiple Access

Dai, Jincheng; Niu, Kai; Si, Zhongwei; Dong, Chao; Lin, Jiaru

doi:10.1109/tsp.2017.2786273

Cited by 40 publications

(15 citation statements)

References 27 publications

(42 reference statements)

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“…It is worth to note that the mother constellation of the widely used (e.g., [57], [74]- [78]) SCMA codebook that is represented in [79], and later described in [43], is in fact the T4QAM constellation. However, in [43], [79] the 2dimensional components of the mother constellation are then rotated according to the Latin square criterion [80] to obtain multidimensional constellations that are different for different users.…”

Section: Overview Of Scma Multidimensional Constellationsmentioning

confidence: 99%

Multidimensional Constellations for Uplink SCMA Systems—A Comparative Study

Vameghestahbanati

Marsland

Gohary

et al. 2019

IEEE Commun. Surv. Tutorials

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Sparse code multiple access (SCMA) is a class of non-orthogonal multiple access (NOMA) that is proposed to support uplink machine-type communication services. In an SCMA system, designing multidimensional constellation plays an important role in the performance of the system. Since the behavior of multidimensional constellations highly depends on the type of the channel, it is crucial to employ a constellation that is suitable for a certain application. In this paper, we first highlight and review the key performance indicators (KPIs) of multidimensional constellations that should be considered in their design process for various channel scenarios. We then provide a survey on the known multidimensional constellations in the context of SCMA systems with their design criteria. The performance of some of those constellations are evaluated for uncoded, high-rate, and low-rate LTE turbo-coded SCMA systems under different channel conditions through extensive simulations. All turbo-coded comparisons are performed for bit-interleaved coded modulation, with a concatenated detection and decoding scheme. Simulation results confirm that multidimensional constellations that satisfy KPIs of a certain channel scenario outperform others. Moreover, the bit error rate performance of uncoded systems, and the performance of the coded systems are coupled to their bit-labeling. The performance of the systems also remarkably depends on the behavior of the multi-user detector at different signal-to-noise ratio regions.Index Terms-Non-orthogonal multiple access (NOMA), Sparse code multiple access (SCMA), low density spreading (LDS), multidimensional constellation, SCMA codebook, fading channels, message passing algorithm (MPA), bit-interleaved coded modulation (BICM), key performance indicators (KPIs).

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Section: Overview Of Scma Multidimensional Constellationsmentioning

confidence: 99%

Multidimensional Constellations for Uplink SCMA Systems—A Comparative Study

Vameghestahbanati

Marsland

Gohary

et al. 2019

IEEE Commun. Surv. Tutorials

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“…A straightforward idea is to conduct joint design of bit-level and symbol-level operations, e.g., joint design of channel encoding and symbol spreading, where the coding structure is optimized according to NOMA transmission [101,102]. However, these designs are much too sensitive to certain channel conditions and require further enhancement for practical implementation.…”

Section: Physical Layer Enhancementmentioning

confidence: 99%

“…Despite the application of NOMA in the cellular networks, NOMA is also a promising technology in other new usage scenarios, e.g., vehicle to X (V2X) [117][118][119], unmanned aerial vehicle (UAV) [120,121], and heterogeneous network (HetNet) [122], due to its superior performance. Although NOMA can be directly employed into these scenarios, elaborate design is still required to accommodate the channel characteristics of these scenarios and satisfy the diversified performance requirements.…”

Section: New Usage Scenariosmentioning

confidence: 99%

Uplink Nonorthogonal Multiple Access Technologies Toward 5G: A Survey

Han

Zhao

et al. 2018

Wireless Communications and Mobile Computing

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Owing to the superior performance in spectral efficiency, connectivity, and flexibility, nonorthogonal multiple access (NOMA) is recognized as the promising access protocol and is now undergoing the standardization process in 5G. Specifically, dozens of NOMA schemes have been proposed and discussed as the candidate multiple access technologies for the future radio access networks. This paper aims to make a comprehensive overview about the promising NOMA schemes. First of all, we analyze the state-of-the-art NOMA schemes by comparing the operations applied at the transmitter. Typical multiuser detection algorithms corresponding to these NOMA schemes are then introduced. Next, we focus on grant-free NOMA, which incorporates the NOMA techniques with uplink uncoordinated access and is expected to address the massive connectivity requirement of 5G. We present the motivation of applying grant-free NOMA, as well as the typical grant-free NOMA schemes and the detection techniques. In addition, this paper discusses the implementation issues of NOMA for practical deployment. Finally, we envision the future research challenges deduced from the recently proposed NOMA technologies.

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“…W ITH the popularity of intelligent terminals, mobile data traffic is facing exponential growth. To meet the potential capacity requirements for future wireless communication, various novel wireless techniques such as massive multipleinput-multiple-output (MIMO), advanced channel coding, and non-orthogonal multiple access have enthused much attention [1]- [3]. Nevertheless, the bandwidth shortage in physical layer leads to the fundamental bottleneck for capacity improvement [4].…”

Section: Introductionmentioning

confidence: 99%

Clustering Based Hybrid Precoding Design for Multi-User Massive MIMO Systems

Zhang

Gui

Ying³

et al. 2019

IEEE Trans. Veh. Technol.

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Hybrid precoding has been recognized as a promising technology to combat the path loss of millimeter wave signals in massive multiple-input multiple-output (MIMO) systems. However, due to the joint optimization of the digital and analog precoding matrices as well as extra constraints for the analog part, the hybrid precoding design is still a tough issue in current research. In this paper, we adopt the thought of clustering in unsupervised learning and provide design schemes for fullyconnected hybrid precoding (FHP) and adaptively-connected hybrid precoding (AHP) in multi-user massive MIMO systems. For FHP, we propose the hierarchical-agglomerative-clusteringbased (HAC-based) scheme to explore the relevance among RF chains in optimal hybrid procoding design. The similar RF chains are merged into an individual RF chain when insufficient RF chains are equipped at the base station (BS). For AHP, we propose the modified-K-means-based (MKM-based) scheme to explore the relevance among antennas at the BS. The similar antennas are supported by the same RF chain to make full use of the flexible connection in AHP. Particularly, in proposed MKM-based AHP design, the clustering centers are updated by alternatingoptimum-based (AO-based) scheme with a special initialization method, which is capable to individually provide feasible subconnected hybrid precoding (SHP) design. Simulation results highlight the superior spectrum efficiency of proposed HACbased FHP scheme, and the high power efficiency of proposed MKM-based AHP scheme. Moreover, all the proposed schemes are clarified to effectively handle the inter-user interference and outperform the existing work.Index Terms-Millimeter wave, multi-user massive MIMO systems, clustering, hybrid precoding.

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Polar-Coded Non-Orthogonal Multiple Access

Cited by 40 publications

References 27 publications

Multidimensional Constellations for Uplink SCMA Systems—A Comparative Study

Multidimensional Constellations for Uplink SCMA Systems—A Comparative Study

Uplink Nonorthogonal Multiple Access Technologies Toward 5G: A Survey

Clustering Based Hybrid Precoding Design for Multi-User Massive MIMO Systems

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