一種稀疏碼本多址接入碼本優(yōu)化設計方法
doi: 10.11999/JEIT180208 cstr: 32379.14.JEIT180208
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重慶郵電大學通信與信息工程學院 ??重慶 ??400065
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移動通信技術重慶市重點實驗室 ??400065
Optimization Design Method for Sparse Code Multiple Access Codebooks
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School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
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Chongqing Key Laboratory of Mobile Communications Technology, Chongqing 400065, China
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摘要:
稀疏碼多址接入(SCMA)作為一種具有競爭力的非正交多址接入(NOMA)技術，該技術通過高維調制與稀疏擴頻的結合，有效地提升了系統(tǒng)的頻譜效率。該文針對現有SCMA碼本設計中存在的問題，提出一種同時適用于高斯信道和瑞利衰落信道的SCMA碼本優(yōu)化設計方法。在該方法中，首先通過旋轉基準星座和母星座，實現母星座在各個維度上投影點間的最小歐氏距離以及疊加在單個資源塊上的總星座中與各用戶對應的星座圖上星座點間的最小歐氏距離的最大化，以提升SCMA碼本在高斯信道下的性能；進而在保持總星座上星座點間最小歐氏距離不變的條件下，通過旋轉疊加在單個資源塊上多個用戶的星座，優(yōu)化疊加在單個資源塊上的與各用戶對應的星座圖中星座點間最小乘積距離和信號空間分集(SSD)階數，最后結合Q路坐標交織技術獲得額外的分集增益，以提升系統(tǒng)抗信道衰落的能力。仿真結果顯示：在高斯信道和瑞利衰落信道下，該文設計的SCMA碼本的性能均明顯優(yōu)于華為公司提出的SCMA碼本和低密度擴頻多址接入(LDS-MA)技術。
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.
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表 1 仿真條件
信道 高斯信道和瑞利衰落信道 信道編碼 1/3碼率Turbo編碼 幀長${L_{fr}}$ 1024 bit 幀數${N_{fr}}$ 300 譯碼算法 Max-log MPA Max-log MPA迭代次數 7 
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