Diversity plays an important role in the MIMO system. At first, wireless multi-diameter fading channel is analyzed theoretically, and on this basis, the principle of diversity techniques is given, then by introducing diversity technique and comparing the advantages and disadvantages of several typical sub-set technologies. The space diversity technology not only can improve the transmission of reliable nature but also not bring the advantages of any loss in bandwidth utilization, and thus it became a diversity techniques for MIMO systems. Finally it is also shown by simulation that spatial diversity techniques can reduce the system bit error rate in slow Rayleigh fading channels.%分集技术在MIMO系统中具有十分重要的地位.首先从理论上分析了无线多径衰落信道.在此基础上给出分集技术原理.然后通过介绍分集技术并比较了几种典型的分集技术的优缺点.得出空间分集技术具有提高传输的可靠性,且不会带来带宽利用率上的任何损失的优势.因而成为了MIMO系统中所采用的分集技术.最后通过仿真验证了在慢瑞利衰落信道中采用空间分集技术能够降低系统的误比特率.
展开▼
