MIMO系统中空间分集增益与复用增益的权衡分析

MIMO系统由于在收发两端采用多天线,可以获得复用增益和分集增益,克服了无线信道的衰落,并提高了数据传输效率.然而,如何去权衡这两者之间的关系,是研究的重点.从简单的MIMO系统模型入手,在确定衡量其系统性能标准的基础上,研究2×2MIMO系统的3种发送策略,并对比分析其分集增益及复用增益,为MIMO系统在不同信道条件下如何权衡两者的关系提供一定的参考价值.

Analysis of the balance between space-diversity gain and multiplexing gain in MIMO system

MIMO system can get additional space-diversity gain and multiplexing gain by set multiple antennas at the trasmitter and the receiver,overcome the fading of the wireless channel,and increase the data transmission rate. However it is important that,how to halance the gain between space-diver- sity and multiplexing,and will be discussed in this paper. Based on the standard of measuring the per- formance of MIMO system, researching three transmit tactics of 2 × 2 MIMO system, which were compared to analysis their diversity gain and degree of freedom, the paper gives a reference in choo- sing the best transmit tactics under the different condition channels of MIMO system.