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Erschienen in:
Introduction to Cellular Mobile Communications Kapitel lesen Erstes Kapitel lesen

2019 | OriginalPaper | Buchkapitel

12. Sparse Code Multiple Access (SCMA)

verfasst von : Zheng Ma, Jinchen Bao

Erschienen in: Multiple Access Techniques for 5G Wireless Networks and Beyond

Verlag: Springer International Publishing

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Abstract

Sparse Code Multiple Access (SCMA) enables non-orthogonal transmissions of multiple users’ signals among code and power domain, which could greatly improve the spectral efficiency. Due to the sparsity of the multi-dimensional codewords, the low-complexity message-passing algorithm (MPA) can be adopted and near maximum likelihood (ML) performance for multi-user detection can be achieved. In this chapter, a general description of SCMA including the system model, codebook mapping, and multi-user detection schemes are provided. The performance analysis for SCMA, such as the codeword error probability and cutoff rate, are introduced. A general introduction on the codebooks design is given, and approaches of some efficient construction for the multi-dimensional constellations/codebooks are discussed.

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Vorheriges Kapitel NOMA in Vehicular Communications
Nächstes Kapitel Interleave Division Multiple Access (IDMA)
Fußnoten
1
In practical scenarios, each user employs one or multiple layers.
 
2
Without feedback from the FEC decoder, \(p(\mathbf {x}_j) = \frac{1}{M}\) for all the users.
 
3
There are M! possible pairing patterns for \((\mathbf {x}_{i,a}, \mathbf {x}_{i,b})\), hence M! choices for \(\mathscr {P}_i\). The tightness of the bound is determined by the specific selection of the pairing patterns. A detailed seek for the appropriate pairing pattern can be found in [19].
 
4
This is the relaxed product distance that takes the product of all the dimension-wise distance between two points into consideration.
 
5
The star-QAM-based codebook targets on downlink channels, while its performance deteriorates in the uplink and for large constellation size.
 
6
The constellation 1 is constructed by rotation over the product of a binary phase-shift keying (BPSK) and a quadrature phase-shift keying (QPSK) constellation with Gray labelings, using the approach in Sect. 12.3.2.2 (G\(_{8,8}\)), and constellation 2 is the repetition over an 8PSK constellation with Gray labeling, i.e., the LDS scheme [29].
 
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Metadaten
Titel
Sparse Code Multiple Access (SCMA)
verfasst von
Zheng Ma
Jinchen Bao
Copyright-Jahr
2019
Buch
Multiple Access Techniques for 5G Wireless Networks and Beyond

Print ISBN: 978-3-319-92089-4

Electronic ISBN: 978-3-319-92090-0

Copyright-Jahr: 2019

DOI
https://doi.org/10.1007/978-3-319-92090-0_12