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arXiv 1702.06381cs.ITmath.IT
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C-RAN中的压缩信道估计和多用户检测

Compressive Channel Estimation and Multi-user Detection in C-RAN

Qi He, Tony Q. S. Quek, Zhi Chen, Shaoqian Li

摘要:

研究了云无线接入网中的信道估计和多用户检测问题。在假设网络中活跃用户稀疏的情况下,利用压缩感知(CS)技术解决CE和MUD问题,大大减少了长识别导频开销。提出了一种用于扩展稀疏群稀疏恢复的混合L{2,1}-正则化泛函,以利用用户活动和活动用户所连接的远程无线电头端(RRH)中存在的固有稀疏特性。经验和理论指导,以帮助选择调谐参数的性能的惩罚功能的关键影响。为了加快处理过程,基于乘子交替方向法和变量分裂策略,提出了一种保证收敛的有效算法。数值结果表明了该算法的有效性.

英文摘要:

This paper considers the channel estimation (CE) and multi-user detection (MUD) problems in cloud radio access network (C-RAN). Assuming that active users are sparse in the network, we solve CE and MUD problems with compressed sensing (CS) technology to greatly reduce the long identification pilot overhead. A mixed L{2,1}-regularization functional for extended sparse group-sparsity recovery is proposed to exploit the inherently sparse property existing both in user activities and remote radio heads (RRHs) that active users are attached to. Empirical and theoretical guidelines are provided to help choosing tuning parameters which have critical effect on the performance of the penalty functional. To speed up the processing procedure, based on alternating direction method of multipliers and variable splitting strategy, an efficient algorithm is formulated which is guaranteed to be convergent. Numerical results are provided to illustrate the effectiveness of the proposed functional and efficient algorithm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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