多天线协作传输系统的容量分析与功率分配

针对非再生及再生2种中继方式，分析了基于多天线技术的2跳协作传输系统的信道容量，并以最大化端到端的信息速率为优化准则，提出了将系统功率根据信道条件分配至各跳链路的方案. 仿真结果不但证明了协作传输的优越性，而且与平均功率分配相比，自适应功率分配能随信道变化协调各跳发射功率，合理选择中继传输，明显提高系统容量.

Capacity Analysis and Power Allocation for Multi-Antenna Cooperative System

Based on the amplify-and-forward or the decode-and-forward mode,the channel capacity was analyzed for a multi-antenna technology based two-hop cooperative system.Taking the maximum end-to-end data rate as the optimization criterion,an adaptive power allocation scheme was proposed to distribute a fractional power to each hop according to the channel state information.The simulation results prove the advantages of the cooperative system and show that compared with the uniform power allocation scheme,the proposed power allocation scheme can improve the system capacity by adjusting each-hop power adaptively and deciding whether or not to relay based on the channel status.