Compute-Forward Multiple Access (CFMA): Practical Implementations SCIE SCOPUS

Cited 3 time in WEB OF SCIENCE Cited 5 time in Scopus
Title
Compute-Forward Multiple Access (CFMA): Practical Implementations
Author(s)
Sula, Erixhen; Zhu, Jingge; Pastore, Adriano; Lim, Sung Hoon; Gastpar, Michael
Publication Year
2019-02
Abstract
We present a practical strategy that aims to attain rate points on the dominant face of the multiple access channel capacity using a standard low complexity decoder. This technique is built upon recent theoretical developments of Zhu and Gastpar on compute-forward multiple access which achieves the capacity of the multiple access channel using a sequential decoder. We illustrate this strategy with off-the-shelf LDPC codes. In the first stage of decoding, the receiver first recovers a linear combination of the transmitted codewords using the sum-product algorithm (SPA). In the second stage, by using the recovered sum-of-codewords as side information, the receiver recovers one of the two codewords using a modified SPA, ultimately recovering both codewords. The main benefit of recovering the sum-of-codewords instead of the codeword itself is that it allows to attain points on the dominant face of the multiple access channel capacity without the need of rate-splitting or time sharing while maintaining a low complexity in the order of a standard point-to-point decoder. This property is also shown to be crucial for some applications, e.g., interference channels. For all the simulations with single-layer binary codes, our proposed practical strategy is shown to be within 1.7 dB of the theoretical limits, without explicit optimization on the off-the-self LDPC codes.
ISSN
0090-6778
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/691
DOI
10.1109/TCOMM.2018.2874240
Bibliographic Citation
IEEE TRANSACTIONS ON COMMUNICATIONS, v.67, no.2, pp.1133 - 1147, 2019
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Subject
INTERFERENCE; CHANNEL; REGION; DESIGN; CODES
Keywords
Compute-forward multiple access (CFMA); multiple access channel; low density parity check codes (LDPC); sequential decoding; sum-product algorithm
Type
Article
Language
English
Document Type
Article
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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