描述了软切换过程中启动的用户协作通信，推导出了在BPSK调制下的误码率，以及最小化的计算量和误码率的最优方案选择。-Describes the soft handover the process of switching the user cooperative communication, derive an expression for the end-to-end bit-error rate (BER) of binary phase-shift keying(BPSK) modulat