基于容量的MIMO信道发射天线选择算法

Selection Algorithms of Transmit Antennas for a MIMO Channel Based on Capacity

当前的MIMO系统是在假设接收端已知信道信息(CSI)而发射端未知CSI的情况下进行研究的。本文提出的发射天线选择算法是用极小的信息反馈量,即反馈一组最优的发射天线子集,就可使信道容量得到很大的增加,较传统的注水算法而言,反馈量大大减少,而容量只略微减少,从而大大降低了反馈信道的带宽。

Current wireless MIMO systems are designed with the assumption that the channel system information （CSI） is estimated perfectly at the receiver while the transmitter has no CSI. This paper proposed selection algorithms of transmit antennas, which can increase channel capacity greatly even through a small amount of information fed back ,that is a set of optimal subset of transmit antennas. Compared with classical water-pouring, these algorithms which ere proposed in the paper can greatly decrease the amount of feedback information while the capacity is only slightly decreased, so that the bandwidth of feedback channel can be decreased greatly.