基于Alamouti编码方案的多天线系统性能界分析与仿真

Performance Bound Analysis and Simulation of Multiple Antennas System Based on Alamouti Coding Scheme

分析了基于A lamouti编码方案(ACS)技术的双发多收天线系统(M IMO/ACS)工作原理.给出了传输符号分离的一般分析方法,计算了系统输出信噪比.对MPSK调制,推导了系统比特误码率Chernoff(切诺夫)上界理论表达式.计算了一种简易的最大似然(ML)判决表达式,方便了系统的性能仿真.蒙特卡洛仿真结果和切诺夫上界均表明:ACS与最大比合并(MRC)具有相同的分集阶数.

The operation principle of a 2Tx-mRx system based on Alamouti coding scheme （ACS） is analyzed. A common approach of transmission symbols decoupled at the reception is represented, and system output signal-tonoise ratio （SNR） is evaluated. Then theory expression of Chemoff upper botmd of system bit error rate （BER） is derived for M-ary phase-shifting key （MPSK） modulation. An amiable maximum likelihood （ML） decision expression is presented, and it is convenient to simulate system pefforrrmance. Monte-Carlo simulating values and Chemoff upper bound show that MIMO/ACS can achieve same diversity order as that of maximal ratio combining （MRC）.