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.