中文摘要：

提出了一种空时编码协作中的中继选择与功率分配联合方案，称为DD（Destination Decision）方案。该方案由目的终端根据协作终端的信道状态信息进行中继选择与功率分配，并决定各中继发送STBC编码矩阵的哪一列，从而避免了通过中继之间的信息交互进行中继选择的冲突。理论分析和仿真结果表明，此方案在保证分集阶数和误码率性能的同时，提高了系统容量。

英文摘要：

This paper proposes a joint scheme called destination decision （DD） scheme for relay selection and power allocation in the space -time coding cooperation. In this scheme, the destination terminal makes the decision of relay selection and power allocation in terms of channel state information and determines which column will be transmitted by the relay nodes, thus avoiding the collisions from information exchange for the relay selection among the relay nodes. Theoretical analysis and simulation results show that this scheme can improve the system capacity on the premise of performance guarantees of the diversity order and BER.