Hardware Design and Implementation of Sparse Code Multiple Access

Yunfei Wu, Jincheng Dai, K. Niu, Chao Dong, Xin Bian
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引用次数: 1

Abstract

Sparse code multiple access (SCMA) has recently emerged as one of the most favorable multiple access schemes for 5G networks, which allows overloading with a large number of users so as to enable massive connectivity. In this paper, we design a hardware framework of a uplink system for SCMA. First, we propose a unified quantization scheme based on density evolution optimization which is independent of signal-to-noise ratios (SNR). Second, we apply a fast convergence message passing algorithm (FC-MPA) in SCMA multiuser detection, in which the function nodes updating and variable nodes updating are processed synchronously so as to make the FC-MPA converge about 2 times faster than standard MPA. Finally, based on FC- MPA, we design a pipelined decoding structure for SCMA so as to increase throughput. FPGA results demonstrate that the fix- point performance achieve a near floating-point performance for different SNR and the pipelined hardware structure we design is feasible.
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稀疏码多址的硬件设计与实现
稀疏码多址(SCMA)最近成为5G网络最有利的多址方案之一,它允许大量用户过载,从而实现大规模连接。本文设计了SCMA上行系统的硬件框架。首先,提出了一种独立于信噪比的基于密度演化优化的统一量化方案。其次,我们将快速收敛消息传递算法(FC-MPA)应用于SCMA多用户检测中,该算法同步处理功能节点更新和变量节点更新,使FC-MPA的收敛速度比标准MPA快2倍左右。最后,在FC- MPA的基础上,为SCMA设计了一种流水线解码结构,以提高吞吐量。FPGA实验结果表明,在不同信噪比的情况下,定点性能达到了接近浮点的性能,所设计的流水线硬件结构是可行的。
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