稀疏码分多址收发端改进方案的设计

doi:10.12305/j.issn.1001-506X.2022.01.40

Abstract

Abstract:

In order to reduce the decoding complexity of the traditional sparse code multiple access (SCMA) system and guarantee the bit error ratio (BER) performance of the system, improved SCMA transceiver system is proposed based on the channel quality factor. An improved message passing algorithm (MPA) dynamically selects nodes based on channel quality is proposed at the receiver, which sorts the node update sequence reasonably on the basis of serial strategy, thereby decreasing the number of iterations of the algorithm to reduce the decoding complexity. At the same time, due to compensate BER performance cost, a dynamic adaptive updating factor graph scheme based on channel quality is designed at the transmitter, which matches resource node combination with high channel gain for user nodes. Besides, considering the fairness of users, the user nodes with the lowest channel gain in the last round of updating factor graph are given priority to match. Simulation experiments show that the proposed improved system can effectively reduce the decoding complexity under the premise of ensuring BER performance and fairness of each user.

Key words: sparse code multiple access (SCMA), channel quality, factor graph, message passing algorithm (MPA)

CLC Number:

TN929.5

Ling ZHUANG, Siyang LIU. Improved scheme design of sparse code multiple access transceiver[J]. Systems Engineering and Electronics, 2022, 44(1): 320-326.

Figures/Tables 8

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References 30

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参数	值
用户数J	6
资源块数K	4
过载率λ	150%
码本大小M	4
每个用户所占资源块数d_v	2
每个资源块所承载的用户数d_f	3
信道模型	瑞利衰落信道
仿真次数	100

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Improved scheme design of sparse code multiple access transceiver

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