基于自适应链路技术的快速分集复用折中算法

Fast Diversity-Multiplexing Tradeoff Algorithm Based on Adaptive Modulation and Power Allocation

对多天线系统误码率性能进行了深入分析,针对以往研究多侧重于分别提高系统分集增益或复用增益,未能充分利用多天线系统性能的问题,提出了基于自适应码率、功率分配技术的多天线系统分集复用折中算法,并进一步给出具有较低计算量的快速折中算法.所提算法以系统误码率为准则,根据信道实时状态信息选择多天线系统工作方式,充分利用系统分集复用增益的同时提供了较好的抗扰动性能,具有较低的计算复杂度,适于实际的通信环境.仿真结果表明与传统算法相比,该算法具有较好的性能.

The characteristics of bit error rate （BER） of a multi-antenna system are analysed. Because the earlier works put stress on designing the schemes to extract either maximal diversity gain or maximal spatial multiplexing gain, but failed to take full advantage of the performance of the system, a multiple-input multiple-output （MIMO） diversity-multiplexing tradeoff algorithm is proposed on the basis of adaptive allocation of code bit and power and, further, an algorithm with less computational complexity is given. Based on the BER criterion, the proposed algorithm is chosen in an appropriate mode according to the instantaneous channel state information （CSI） and makes full use of the two gains as above to serve well the anti-interference function with less computational complexity provided to adapt to practical applications. Simulation results indicated that the performance of the proposed algorithm is superior to the conventional one with high effectiveness and feasibility.