协同信道空时优化MIMO无线传输系统

该文提出一种基于虚拟信道的空时优化多输入多输出(MIMO)无线传输系统。通过在发射端产生不同的空时虚拟信道，与实际空间无线信道级联，构成系统的整体传输信道即协同空分信道。系统可以根据接收端的反馈信息采用模拟退火算法来优化虚拟信道，改善误码率(BER)性能。利用虚拟信道方法，可以使一根MIMO发射天线在同一时间、同一频段传输多路叠加合并后的数据信号，从而可以使发射的不同数据信号的总路数超过发射天线的数量，突破了现有MIMO系统在同一时间、同一频段最多只能发射与发射天线数量相等的不同数据信号的传统方式，可以显著提高系统的频谱效率。仿真结果和基于ZC706和AD9361硬件平台的微波暗室实际测试结果充分验证了新MIMO系统的有效性。

Cooperative Channel MIMO Wireless Transmission System with Space-time Optimization

A space-time optimized Multiple-Input Multiple-Output (MIMO) wireless transmission system based on virtual channel method is proposed. At the transmitter, various space-time virtual channels are generated that are connected with the actual space wireless channels to form the cooperative space division channels. According to the feedback information from the receiver, the Bit Error Rate (BER) can be significantly improved by using the simulated annealing algorithm to optimize the virtual channels. Morever, by using the virtual channel method, it allows one MIMO antenna to transmit multiple superposed data streams in one frequency band at the same time, therefore it can transmit more number of different data streams than the number of transmit antennas, breaking the conventional way that the number of different data streams to be transmitted is equal to the number of transmit antennas. Thus, the proposed MIMO system can significantly improve the spectral efficiency. Simulation results and experimental test results based on ZC706 and AD9361 hardware platforms in microwave anechoic chamber fully demonstrate the effectiveness of the proposed MIMO system.