Irregular SCMA System for Enhanced Quality of Service

Rebhi, Manel; Hassan, Kaïs; Raoof, Kosai; Chargé, Pascal

doi:10.1109/itc-egypt55520.2022.9855705

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…ii. The irregular SCMA, as its name indicates, is designed such that the codebooks are allocated differently according to the different needs of users [3]. Figure 1 presents an example of a regular SCMA system, obviously, we have N j ¼ 2, 1 ≤ j ≤ J and M j ¼ 4, 1 ≤ j ≤ J.…”

Section: Basic Principles Of Multi-dimensional Constellationsmentioning

confidence: 99%

Multi-Dimensional Codebooks for Multiple Access Schemes

Hassan¹,

Raoof²,

Chargé³

2023

Coding Theory Essentials

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The sparse code multiple access (SCMA) scheme directly maps the incoming bits of several sources (users/streams) to complex multi-dimensional codewords selected from a specific predefined sparse codebook set. The codewords of all sources are then superimposed and exchanged. The shaping gain of the multi-dimensional constellation of SCMA leads to a better system performance. The decoder’s objective will be to separate the superimposed sparse codewords. Most existing works on SCMA decoders employ message passing algorithm (MPA) or one of its variations, or a combination of MPA and other methods. The system architecture is highlighted and its basic principles are presented. Then, an overview of main multi-dimensional constellations for SCMA systems will be provided. Afterwards, we will focus on how the SCMA codebooks are decoded and how their performance is evaluated and compared.

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Section: Basic Principles Of Multi-dimensional Constellationsmentioning

confidence: 99%

Multi-Dimensional Codebooks for Multiple Access Schemes

Hassan¹,

Raoof²,

Chargé³

2023

Coding Theory Essentials

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“…Practically, it is desirable that SCMA codebooks and detectors can be adapted to different users requirements. Some existing works on adaptive SCMA are proposed in [129], [130].…”

Section: Complexity Arises From Only Addition Operationsmentioning

confidence: 99%

A Tutorial on Decoding Techniques of Sparse Code Multiple Access

et al. 2022

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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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Irregular SCMA System for Enhanced Quality of Service

Cited by 2 publications

References 11 publications

Multi-Dimensional Codebooks for Multiple Access Schemes

Multi-Dimensional Codebooks for Multiple Access Schemes

A Tutorial on Decoding Techniques of Sparse Code Multiple Access

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