基于QRD和SIC检测的多入多出中继网络分布式波束形成方案

Distributed Beamforming Schemes Based on QR Decomposition and SIC Detection for MIMO Relay Networks

考虑多天线多中继两跳半双工无线网络,基于AF协议提出了RZF和IRZF-MF 2种分布式波束形成方案.在中继节点,前者使用RZF技术进行接收和发射波束形成,后者分别使用IRZF和MF技术进行接收和发射波束形成.仿真结果显示,在瑞利信道下,2种方案与现有的MF-RZF方案性能相当;而在莱斯信道下,文中RZF方案性能最优,但需要较高的计算复杂度.相对于除RZF方案的其他方案,IRZF-MF实现了系统容量增益,并且其计算复杂度低于RZF方案.

This paper is concerned with a two hop half-duplex wireless communication network with multi ple antennas and multiple relays. Based on amplify-and-forward （AF） protocol, two new distributed beam- forming schemes named IRZF MF and RZF were proposed for this system. The RZF scheme uses RZF technique for both receive and transmit beamforming while the IRZF-MF scheme uses IRZF and MF tech- nique for receive and transmit beamforming respectively. The simulation results show that the proposed two relay schemes achieve the same performance of existing MF-RZF scheme in the Rayleigh channel, meanwhile, the proposed RZF scheme achieves the best performance which requires a higher computational complexity and the proposed IRZF-MF scheme achieves the second best performance while requires less computational complexity than RZF scheme in the Rician channel compared with other existing distributed relaying schemes.