最大似然译码算法在Alamouti方案中的应用。理论上推导出发射天线数为2接收天线为的Alamouti方案与发射天线为1接收天线为2的最大比合并（MRC）接收分集的分集增益相同。并通过Matlab对系统进行了仿真，验证了理论分析的正确性。-Maximum likelihood decoding algorithm in Alamouti Scheme. Theoretically antenna number 2 to the receiving antenna and transmitting antenna Alamouti scheme as a receiving antenna 2 is maximum ratio combining (MRC) diversity reception diversity gain of the same. And the system by Matlab simulation to verify the theoretical analysis.