Low-complexity coding scheme to approach multiple-access channel capacity
Low-complexity coding scheme to approach multiple-access channel capacity
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DOI：
10.1109/isit.2015.7282827
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发表时间：
2015-06
期刊：
影响因子：
--
通讯作者：
Guanghui Song;Jun Cheng
中科院分区：
文献类型：
--
作者：
Guanghui Song;Jun Cheng
A very simple coding scheme, called multi-user repetition-aided irregular repeat-accumulate (IRA) code, is proposed to approach the multiple-access channel (MAC) capacity. The main idea is that not only parity checks, which are generated by an IRA encoder, but also repetitions are used in each user's codeword to reduce the coding and decoding complexities. Repetition is a simple way to construct a low-rate code and is shown to be beneficial for multi-user decoding iteration. It is shown that there is a maximum allowable fraction of repetitions in codewords, below which channel capacity can always be approached by optimizing the degree distribution of the IRA encoder. As users increase, the maximum allowable fraction of repetitions increases, and therefore, very low encoding and decoding complexities are required.
