A Capacity-based Codebook Design Method for Sparse Code Multiple Access Systems

被引:0
|
作者
Zhang, Shutian [1 ]
Xiao, Kexin [1 ]
Xiao, Baicen [1 ]
Chen, Zhiyong [1 ]
Xia, Bin [1 ]
Chen, Dageng [2 ]
Ma, Shaodan [3 ]
机构
[1] Shanghai Jiao Tong Univ, Dept Elect Engn, Shanghai, Peoples R China
[2] Huawei Technol Co Ltd, Commun Technol Lab, Shanghai, Peoples R China
[3] Univ Macau, Dept Elect & Comp Engn, Macau, Peoples R China
关键词
CHANNELS;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Sparse code multiple access (SCMA) is a novel non-orthogonal multiple access scheme, which exploits a multidimensional constellation based on the non-orthogonal spreading technique. The SCMA multi-user codebook design is the bottleneck of system performance and there is no design guideline from the perspective of capacity. In this paper, a novel SCMA codebook design scheme is proposed to maximize the sum rate, where we transfer the design of multi-dimensional constellation sets to the optimizing of series of 1-dimensional complex codewords. Specifically, a basic M-order pulse-amplitude modulation (PAM) is optimized and then the angles of rotation between the input 1 dimensional constellation and the basic M-PAM constellation can be obtained within a feasible calculation complexity to improve the sum-rate. Finally, the series of 1-dimensional complex code words are combined to construct multi-dimensional codebooks based on Latin square criterion. Numerical results illustrate that the proposed codebook outperforms the existing codebook by 1.3 dB over AWGN channel and 1.1 dB over Rayleigh channel in terms of bit error rate (BER) performance.
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页数:5
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