太赫兹大规模MIMO系统DSP-OMP混合预编码设计  

Hybrid Precoding Design for Terahertz Massive MIMO Systems Using DSP-OMP

作　　者：李倩倩[1] 张馨月 庞立卓 常争 戴晓明[1] LI Qianqian;ZHANG Xinyue;PANG Lizhuo;CHANG Zheng;DAI Xiaoming(University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学,北京100083

出　　处：《移动通信》2023年第5期64-68,共5页Mobile Communications

摘　　要：太赫兹具有频谱资源丰富、传输速率高等优势,但其波束分裂效应会造成可达速率及阵列增益损失严重。针对太赫兹大规模多输入多输出系统波束分裂问题,提出一种基于时延相移正交匹配追踪混合预编码方案。通过在射频链和传统移相器网络之间引入一个时延网络缓解波束分裂,结合正交匹配追踪算法降低角度估计带来的计算复杂度。仿真结果表明,所提方案能够有效补偿阵列增益损失,相比传统算法呈现较好的可达速率性能。Terahertz(THz)boasts a wealth of spectrum resources and high transmission rates.Nevertheless,the beam split efiect in THz systems is a double-edged sword that causes severe degradation in achievable rates and array gains.To address this issue in large-scale multiple-input multiple-output(MIMO)systems operating in the THz frequency range,we present a hybrid precoding scheme based on delay-phase shift and orthogonal matching pursuit(OMP).By introducing a time delay network between the radio frequency chain and the traditional phase shifter network,the proposed scheme effectively mitigates the beam split degradation,while reducing the computational complexity associated with angle estimation through the integration of the OMP algorithm.Simulation results demonstrate that the proposed scheme not only effectively compensates for array gain loss,but also exhibits superior achievable rate performance compared to traditional algorithms.

关 键 词：太赫兹 波束分裂 大规模MIMO 时延相移 正交匹配追踪 

分 类 号：TN929.5[电子电信—通信与信息系统]