中文摘要：

分别针对瑞利衰落信道和Nakagami衰落信道,研究了使用发射天线选择（TAS）和正交空时分组码（STBC）的多输入多输出系统的平均符号误码率（ASEP）性能.基于标量加性高斯白噪声（AWGN）信道的方法,推导出了采用脉冲幅度调制（PAM）、相移键控（PSK）和正交幅度调制（QAM）的精确和近似的ASEP闭合表达式.然后对不同条件下的系统性能做了数值仿真,验证了分析结果的正确性.

英文摘要：

The average symbol error probability（ASEP） of multiple-input multiple-output（MIMO）systems employing transmit antenna selection （TAS） and orthogonal space-time block code （STBC）over Rayleigh-fading and Nakagami-fading channels is considered.Based on the scalar additive white Gaussian noise （AWGN） channel approach,the exact and approximate closed form ASEP expressions are derived for pulse amplitude modulation（PAM）,phase shift keying modulation（PSK） and quadrature amplitude modulation（QAM）.Then the performance under different conditions is evaluated through numerical simulations.The accuracy of the analytical results is verified.