一种改进的闭环V-BLAST系统自适应方案

A Modified Adaptive Scheme for Closed-loop V-BLAST System

将闭环V-BLAST(贝尔实验室垂直分层空时结构)系统中发射天线的选择和每根天线上的功率和速率控制结合在一起,并提出一种半盲功率分配准则,得到一种基于固定总发射功率和系统频谱效率下最小BER(比特误码率)的新反馈方案。考虑到实用的方面,同时也给出了一种低复杂度的近似最优快速算法。相应的检测方法选择用ZF-SIC(迫零去干扰)检测。仿真结果表明,基于新反馈准则的闭环V-BLAST系统在性能上显著超出传统的开环V-BLAST系统。

In this paper, the transmit antenna selection is combined with power and rate control of each antenna in closed-loop V-BLAST（ Vertical Bell Laboratories Layered Space-Time） system . A simple criterion using a semiblind power allocation strategy is derived for minimum BER（ bit-error rate）when the total spectral efficiency and the transmit power are constant. For practical implementation, a fast algorithm is presented to give near-optimal performance with very low complexity, using ZF-SIC （zero-forcing successive interference cancellation） for detection. Simulation resuhs show that the proposed closed-loop V-BLAST outperforms the open-loop V-BLAST significantly in terms of BER performance.