One form of coordinated multiple point communications, Interference alignment ( IA ) , can see it as a distributed multiple⁃input multiple⁃output( MIMO) implementation. It can effectively improve system capacity and reliability. However, the current study was based on a given power;it does not take full advantage of the system’s total power.Firstly,based on the concept of channel matrix condition number,which effectively responds to the channel situation,a feedback mechanism for the optimal power distribution is proposedinvertical bell labs layered space⁃time coding(V⁃BLAST)MIMO system.The scheme utilized condition number as the small amount of feedback,and the power distribution was made according tocondition number ranges. Simulation results show that the power distribution scheme based on limit feedback effectively reduced error frame rate and improved the system throughput.%干扰对齐技术作为协作通信技术的实现形式之一，可以看作一种分布式多输入多输出（ MIMO）技术，有效提高了无线通信系统的容量和可靠性。但是目前该技术的实现方案均是基于固定功率分配的。针对基于垂直分层空时码（ V－BLAST）实现空间复用的MIMO系统，提出了一种基于条件数的自适应功率分配方案，即在给定有限反馈比特的前提下，实现最优的功率控制。该方案只需引入少量反馈信息，在发送端进行功率分配，对于给定的条件数区间，选择相应的发送功率。仿真结果表明，该功率分配方案有效地降低了误帧率，提高了系统容量。
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