Dynamic SCMA Codebook Assignment Methods: A Comparative Study

In this letter, we consider a sparse code multiple access (SCMA) system, in which we assign the subcarriers to users based on the available channel gains between the users and base station over all subcarriers, referred to as channel state information. The effect of this process, referred to here as...

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Bibliographic Details
Published in:IEEE communications letters 2018-02, Vol.22 (2), p.364-367
Main Authors: Dabiri, Milad, Saeedi, Hamid
Format: Article
Language:English
Subjects:
Base stations
Bit error rate
Channel state information
codebook assignment
Measurement
NOMA
non-orthogonal multiple access (NOMA)
resource allocation
Resource management
Sparse code multiple access (SCMA)
Wireless networks
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Summary:In this letter, we consider a sparse code multiple access (SCMA) system, in which we assign the subcarriers to users based on the available channel gains between the users and base station over all subcarriers, referred to as channel state information. The effect of this process, referred to here as codebook assignment, has not been considered before on link-level performance of an SCMA. We propose three codebook assignment methods and compare their performance with each other as well as with the conventional case, where no assignment is performed. It is shown that significant performance improvement is achieved when any of the proposed methods is deployed. Through one of the proposed methods, we show that a trade-off between user performance fairness and performance is achievable.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2017.2764469