陶红宝1
1.重庆邮电大学通信与信息工程学院 ??重庆 ??400065
2.移动通信技术重庆市重点实验室 ??400065
基金项目:国家科技重大专项(2016ZX03001010-004)，重庆市重点产业共性关键技术创新专项(cstc2017zdcy-zdyfX0021)
详细信息
作者简介:景小荣：男，1974年生，博士，教授，主要研究方向多天线技术、非正交多址接入技术
陶红宝：男，1992年生，硕士生，研究方向非正交多址系统信号处理
通讯作者:景小荣 jingxr@cqupt.edu.cn
中图分类号:TN929.5计量
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被引次数:0
出版历程
收稿日期:2018-02-28
修回日期:2018-09-07
网络出版日期:2018-09-21
刊出日期:2019-01-01
Optimization Design Method for Sparse Code Multiple Access Codebooks
Xiaorong JING1, 2,,,Hongbao TAO1
1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2. Chongqing Key Laboratory of Mobile Communications Technology, Chongqing 400065, China
Funds:The National Science and Technology Major Special Project of China (2016ZX03001010-004), The Innovation Project of the Common Key Technology of Chongqing Major Industry (cstc2017zdcy-zdyfX0021)
摘要
摘要:稀疏码多址接入(SCMA)作为一种具有竞争力的非正交多址接入(NOMA)技术，该技术通过高维调制与稀疏扩频的结合，有效地提升了系统的频谱效率。该文针对现有SCMA码本设计中存在的问题，提出一种同时适用于高斯信道和瑞利衰落信道的SCMA码本优化设计方法。在该方法中，首先通过旋转基准星座和母星座，实现母星座在各个维度上投影点间的最小欧氏距离以及叠加在单个资源块上的总星座中与各用户对应的星座图上星座点间的最小欧氏距离的最大化，以提升SCMA码本在高斯信道下的性能；进而在保持总星座上星座点间最小欧氏距离不变的条件下，通过旋转叠加在单个资源块上多个用户的星座，优化叠加在单个资源块上的与各用户对应的星座图中星座点间最小乘积距离和信号空间分集(SSD)阶数，最后结合Q路坐标交织技术获得额外的分集增益，以提升系统抗信道衰落的能力。仿真结果显示：在高斯信道和瑞利衰落信道下，该文设计的SCMA码本的性能均明显优于华为公司提出的SCMA码本和低密度扩频多址接入(LDS-MA)技术。
关键词:非正交多址接入/
稀疏码多址接入/
高斯信道/
瑞利衰落信道/
坐标交织
Abstract:As a competitive Non-Orthogonal Multiple Access (NOMA) technique, Sparse Code Multiple Access (SCMA) improves efficiently the system spectral efficiency by combining the high dimensional modulation and sparse spread spectrum. To address the existing issues of SCMA codebook design, an optimization design method for SCMA codebooks is proposed for both Rayleigh fading and Gaussian channels. In the method, by rotating the base constellation and the mother constellation, the minimum Euclidean distance between the projection points of the mother constellation on each dimension, and between the constellation points on the constellations corresponding to each user in the total constellation on a single resource block is maximized in order to improve the performance of the SCMA codebooks over Gaussian channels; On the basis of it, by rotating the constellation of multiple users superimposed on each resource block, the corresponding minimum product distance and the Signal Space Diversity (SSD) order of the users’ constellations are optimized; At last, an additional diversity gain is achieved by using Q-coordinate interleaving technology to improve further the performance over the Rayleigh fading channels. Simulation results show that the performance of the proposed SCMA codebooks outperforms that of the HUAWEI’ SCMA codebooks and Low Density Signature Multiple Access (LDS-MA) in both the Gaussian channels and the Rayleigh fading channels.
Key words:Non-Orthogonal Multiple Access (NOMA)/
Sparse Code Multiple Access (SCMA)/
Gaussian channels/
Rayleigh fading channels/
Coordinate interleaving
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