SCMA Codebook Design Based on Uniquely Decomposable Constellation Groups

Zhang, Xuewan; Zhang, Dalong; Yang, Liuqing; Han, Gangtao; Chen, Hsiao‐Hwa; Zhang, Di

doi:10.1109/twc.2021.3062613

Cited by 26 publications

(19 citation statements)

References 38 publications

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“…In [67], a multistage optimization scheme was proposed to design low-projected multidimensional constellations. A uniquely decomposable constellation group (UDCG) based CB design was proposed in [68] for larger modulation order. It should be noticed that the designing criteria D in (5) should not be compromised with the constellation operators.…”

Section: ) Constellation Operatorsmentioning

confidence: 99%

A Tutorial on Decoding Techniques of Sparse Code Multiple Access

Chaturvedi¹,

Liu²,

Srivastava³

et al. 2022

Preprint

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Sparse Code Multiple Access (SCMA) is a disruptive code-domain non-orthogonal multiple access (NOMA) scheme to enable future massive machine-type communication networks. As an evolved variant of code division multiple access (CDMA), multiple users in SCMA are separated by assigning distinctive sparse codebooks (CBs). Efficient multiuser detection is carried out at the receiver by employing the message passing algorithm (MPA) that exploits the sparsity of CBs to achieve error performance approaching to that of the maximum likelihood receiver. In spite of numerous research efforts in recent years, a comprehensive one-stop tutorial of SCMA covering the background, the basic principles, and new advances, is still missing, to the best of our knowledge. To fill this gap and to stimulate more forthcoming research, we provide a holistic introduction to the principles of SCMA encoding, CB design, and MPA based decoding in a self-contained manner. As an ambitious paper aiming to push the limits of SCMA, we present a survey of advanced decoding techniques with brief algorithmic descriptions as well as several promising directions.

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Section: ) Constellation Operatorsmentioning

confidence: 99%

A Tutorial on Decoding Techniques of Sparse Code Multiple Access

Chaturvedi¹,

Liu²,

Srivastava³

et al. 2022

Preprint

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“…The results showed that the deliberate design can accurately notice lively devices in the network. [50] [39].…”

Section: Table I Recent Trends In Sparse Code Multiple Access (Scma) ...mentioning

confidence: 99%

Investigating High Performance Implementations of Sparse Code Multiple Access (SCMA) Codebook Design

Mustafa¹,

Shaikh²,

Sikander³

et al. 2022

JISR-C

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-The number of mobile devices, IoT devices, and their applications is increasing day by day in recent years and further going to increase in coming years. These applications and devices demand large connectivity, high throughput, and low latency which can be possible only in the B5G or 6G. The effective utilization of the spectrum is done by multiple access techniques which facilitate the spectrum to accommodate a large number of users. The 5G has different new technologies to support the massive user demand and high-speed data rate. The non-orthogonal multiple access scheme (NOMA) is considered for the B5G or 6G. The NOMA offers a massive number of user connectivity in contrast to the OMA which is an orthogonal multiple access scheme. The performance evaluation of the SCMA is investigated and recent advancement in the field of NOMA is discussed in this paper. The BER performance of Capacity-based codebook design and codebook design based on lattice constellation is evaluated on the two different channels i.e AWGN and Rayleigh fading channel. The behavior of capacity-based codebook design is better than lattice-based codebook design. The performance of both codebook designs surpasses AWGN in contrast to the Rayleigh fading channel by the multipath available in the Rayleigh Fading channel.

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“…n,i denotes the ith symbol at the nth entry of C M C . Hence, the permutation should be chosen to maximise (28), i.e.,…”

Section: B Construction Of the N -Dimension MCmentioning

confidence: 99%

“…Genetic algorithm was employed to maximize the MED of the superimposed codewords in [27]. In addition, a uniquely decomposable constellation group based codebook design approach was proposed in [28] by maximizing the MED at each resource node. A novel class of powerimbalanced SCMA codebooks has been developed in [29] by maximizing the MED of the superimposed codewords whilst maintaining a large MPD of the MC.…”

Section: Introductionmentioning

confidence: 99%

A Design of Low-Projection SCMA Codebooks for Downlink Satellite Internet of Things

Luo¹,

Liu²,

Chen³

et al. 2022

Preprint

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This paper presents a systematic investigation on codebook design of sparse code multiple access (SCMA) communication in downlink satellite Internet-of-Things (S-IoT) systems that are generally characterized by Rician fading channels. To serve a huge number of low-end IoT sensors, we aim to develop enhanced SCMA codebooks which enable ultra-low decoding complexity, while achieving good error performance. By analysing the pair-wise probability in Rician fading channels, we deduce the design metrics for multi-dimensional constellation construction and sparse codebook optimization. To reduce the decoding complexity, we advocate the key idea of projecting the multi-dimensional constellation elements to a few overlapped complex numbers in each dimension, called low projection (LP). We consider golden angle modulation (GAM), thus the resultant multi-dimensional constellation is called LPGAM. With the proposed design metrics and based on LPGAM, we propose an efficient approach of multi-stage optimization of sparse codebooks. Numerical and simulation results show the superiority of the proposed LP codebooks (LPCBs) in terms of decoding complexity and error rate performance. In particular, some of the proposed LPCBs can reduce the decoding complexity by 97% compared to the conventional codebooks, and own the largest minimum Euclidean distance among existing codebooks. The proposed LPCBs are available at https://github.com/ethanlq/SCMA-codebook.

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SCMA Codebook Design Based on Uniquely Decomposable Constellation Groups

Cited by 26 publications

References 38 publications

A Tutorial on Decoding Techniques of Sparse Code Multiple Access

A Tutorial on Decoding Techniques of Sparse Code Multiple Access

Investigating High Performance Implementations of Sparse Code Multiple Access (SCMA) Codebook Design

A Design of Low-Projection SCMA Codebooks for Downlink Satellite Internet of Things

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