Hybrid Precoding Algorithm Based on Discrete Orthogonal Matching Pursuit for Millimeter-Wave Relay Networks

doi:10.19678/j.issn.1000-3428.0055237

Abstract

Abstract: In order to improve the beamforming gain of massive Multiple-Input Multiple-Output(MIMO) relay system and reduce the hardware cost of phase shifters and radio frequency links in hybrid precoding architecture,this paper proposes a hybrid precoding algorithm based on discrete orthogonal matching pursuit for relay networks.Aiming at maximizing the spectral efficiency of the system,the multi-node complex optimization problem is decoupled to reduce the complexity of the solution to the optimal hybrid precoding matrix.Then the solution to the hybrid precoding matrix of the relay node is transformed into a spatial sparse reconstruction problem.Finally,the discrete orthogonal matching pursuit algorithm is used to obtain the discretized joint solution to the analog precoding reception and transmission of relay.Simulation results show that compared with all digital precoding and infinite precision orthogonal matching pursuit algorithm,the proposed algorithm for relay networks reduces the quantified loss on the transmission end of the relay.Also,the spectral efficiency reached by using the low-precision phase shifter is close to that reached by using the full-precision phase shifter.

Key words: millimeter-wave, massive Multiple-Input Multiple-Output(MIMO), relay, discrete phase shifter, orthogonal matching pursuit

摘要： 为提高大规模多输入多输出（MIMO）中继系统的波束成形增益，降低混合预编码架构中移相器与射频链路的硬件成本，提出一种基于离散化正交匹配追踪的中继混合预编码算法。以最大化系统频谱效率为目的，通过解耦多节点复杂优化问题降低求解最优混合预编码矩阵的复杂度。将中继节点混合预编码矩阵的求解转化为空间稀疏重构问题，采用离散化正交匹配追踪算法对中继接收模拟预编码与中继发送模拟预编码进行离散化联合求解。仿真结果表明，与全数字预编码和无限精度正交匹配追踪算法相比，该算法对中继发送端具有更低的量化损耗，且使用较低量化精度移相器能够达到接近全精度移相器时的频谱效率。

关键词: 毫米波, 大规模多输入多输出, 中继, 离散移相器, 正交匹配追踪

CLC Number:

TN928

DING Qingfeng, GAO Xinpeng, DENG Yuqian. Hybrid Precoding Algorithm Based on Discrete Orthogonal Matching Pursuit for Millimeter-Wave Relay Networks[J]. Computer Engineering, 2020, 46(7): 192-197,205.

丁青锋, 高鑫鹏, 邓玉前. 毫米波中继网络离散正交匹配追踪混合预编码算法[J]. 计算机工程, 2020, 46(7): 192-197,205.

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