V-BLAST部分发射天线选择方案

Partial Transmit Antenna Selection for V-BLAST System

研究了利用部分发射天线选择来提高V-BLAST系统的性能.该方案先通过一种不完全QR分解将最先检测的p层符号和后检测的M-p层符号分离出来,然后按一定的选择标准进行天线选择,并检测这些符号.接着在接收信号中去除已检测符号的贡献部分,并检测剩下的符号.和常规的选择相比,该方案按p值的不同提供了复杂度与性能之间多种可能的折衷.SER性能仿真表明,只要选择前面若干层发射天线,系统性能就能接近全部天线选择情况.有关天线选择时间的仿真表明,对于4组发射和4组接收射频电路,6根发射天线情形,部分发射天线选择方案(基于最大最小后处理信噪比准则)可节约40%至92%的选择时间.

A vertical bell laboratories layered space-time （V-BLAST） system with palatial transmit antenna selection is studied. The first p layers are separated from the remaining M-p layers by an incomplete QR decomposition. Then, the corresponding p antennas are selected according to a certain selection criterion and the first p layers are detected. After eliminating contributions of the first p layers from the received signals, the remaining M -p layers are also detected. Compared with conventional selection methods, this selection scheme provides multiple trade-offs between complexity and performance according to p. Simulation results show that the partial transmit antenna selection retains most of the symbol error ratio （SER） performance of the full selection system. For a 4 transmit RF chains with 4 receive RF chains and 6 transmit antennas, simulation results show that the partial transmit antenna selection based on the max-min criterion can save about 40% up to 92% of the selection time required for the full selection system.