艾森斯坦整数优化的SCMA码本设计方法

doi:10.12382/bgxb.2022.0021

摘要/Abstract

摘要：

第五代移动通信(5G)技术具有极高的数据传输速率并支持海量数据连接,然而传统的正交接入技术无法保证资源的高效利用。稀疏码分多址接入(SCMA)技术是一种非正交多址技术,通过资源块的有效分配保证了海量用户信息的可靠传输。在SCMA技术中,码本起着至关重要的作用。为了解决传统码本设计方法存在的误码率降低受限问题,通过艾森斯坦整数对资源块上的母星座进行构造,并引入网格编码调制技术(TCM)的子集分割思想,从而提出一种艾森斯坦整数优化(EIO)码本设计方法。仿真结果表明,在相同条件下,相比华为码本、传统艾森斯坦整数码本及TCM码本,EIO码本可以达到更低的误码率,为SCMA技术提供了一个可行的码本设计方法。

关键词: 第五代移动通信技术, 非正交多址技术, 稀疏码分多址接入技术, 艾森斯坦整数, 码本

Abstract:

The emergence of 5th generation mobile networks (5G) has provided unprecedented data transmission rates and support for massive data connections. However, traditional orthogonal access technologies cannot guarantee efficient resource utilization. As a type of Non-Orthogonal Multiple Access, Sparse Code Multiple Access (SCMA) technology ensures the reliable transmission of massive user information through effective allocation of resource blocks. The design of the codebook plays a vital role in the efficacy of SCMA technology. In response to limited error rate reduction in traditional codebook design methods, this paper proposes the Eisenstein Integer Optimization (EIO) method. This method constructs the mother constellation on the resource block using Eisenstein Integer (EI) and incorporates the concept of subset segmentation of trellis coded modulation (TCM). Simulation results indicate that, under identical conditions, EIO codebooks offer a lower bit error rate than Huawei codebooks, traditional Eisenstein codebooks, and TCM codebooks. This study provides a feasible codebook design method for SCMA technology.

Key words: 5G technology, non-orthogonal multiple access, sparse code multiple access, Eisenstein integer, codebook

刘芳, 刘健, 冯永新. 艾森斯坦整数优化的SCMA码本设计方法[J]. 兵工学报, 2023, 44(5): 1529-1536.

LIU Fang, LIU Jian, FENG Yongxin. Eisenstein Integer Optimized SCMA Codebook Design Method[J]. Acta Armamentarii, 2023, 44(5): 1529-1536.

图/表 9

图1 SCMA编码原理

Fig.1 SCMA coding mechanism

图2 资源块上的母星座

Fig.2 Mother constellation on resource blocks

图3 TCM分割法产生的子集星座

Fig.3 Subset constellations generated by TCM segmentation

图4 用户与资源块星座矩阵图

Fig.4 Constellation matrix of user and resource blocks

图5 MPA下不同码本性能对比

Fig.5 Comparison of different codebooks using MPA

图6 DS-MPA下不同码本性能对比

Fig.6 Comparison of different codebooks using DS-MPA

图7 PM-MPA下不同码本性能对比

Fig.7 Comparison of different codebooks using PM-MPA

图8 SD-MPA下不同码本性能对比(Δ=δ)

Fig.8 Comparison of different codebooks using SD-MPA (Δ=δ)

图9 SD-MPA下不同码本性能对比(Δ=2δ)

Fig.9 Comparison of different codebooks using SD-MPA (Δ=2δ)

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