全双工MIMO中继系统高性能的波束成型算法

A high-performance beamforming scheme for full duplex MIMO relays

摘要:

为了更好地抑制全双工多入多出技术(MIMO)中继系统的自干扰，提高信息传输速率，提出了一种新型的波束成型组合算法。该组合在源节点和目的节点采用奇异值分解的波束成型向量，而在中继站采用基于最大化信干噪比接收波束成型来抑制中继端的自干扰，以及最大化信泄噪比发射波束成型矩阵来减少中继发送端泄漏到中继接收机的信号组合波束成型算法。为了降低复杂度，随后引入了交替迭代结构来进一步优化中继接收和发送波束成型矩阵，并比较了不同组合波束成型方案的和速率性能。仿真结果表明，与现存的波束成型组合相比，当干噪比较低时，提出的组合算法能够提供更优的和速率性能。

关键词:全双工中继;自干扰;波束成型;最大化信干噪比;最大化信泄噪比

Abstract:

Full-duplex systems perform simultaneous transmission and reception in the same frequency band, hence promising up to twice the data rate offered by half-duplex systems. However, in full-duplex systems, self-interference at the relay, due to the signal leakage from its transmitter to receiver, will lead to a significant degradation of the system performance. Therefore, one of the key challenges in full-duplex relaying systems is how to manage and control self-interference efficiently. In order to suppress the self-interference from relay transmission to relay reception and improve the transmission rate, a new beamforming combination method is proposed for full-duplex Multiple Input Multiple Output(MIMO) relaying system. This method consists of Singular Value Decomposition(SVD) beamforming at source and destination node, Maximum Signal to Interference plus Noise Ratio(Max-SINR) receive beamforming, and transmit beamforming Maximum Signal to Leakage plus Noise Ratio(Max-SLNR) at relay station, respectively. Then, an iterative structure between Max-SINR and Max-SLNR is introduced to optimize the beamforming matrix at the relay jointly. Simulation results show the proposed method performs better than the existing beamforming schemes as the Interference to Noise Rate(INR) decreases.

Key words:full-duplex relays;self-interference;beamforming;Maximum Signal to Interference plus Noise Ratio(Max-SINR);Maximum Signal to Leakage plus Noise Ratio(Max-SLNR)