车联网中的车-车通信系统，在未来智能交通中将发挥极其重要的作用，是人们未来生活中不可缺少的一个重要组成部分。文章在双瑞利衰落信道下，研究了使用发射天线选择（transmit antenna selection，TAS）和正交空时分组码（orthogonal space-time block code，OSTBC）的车-车通信系统的平均符号误码率（average symbol error probability， ASEP）性能。利用基于标量加性高斯白噪声（additive white Gaussian noise，AWGN）信道的方法，得到了车-车通信系统使用多进制正交幅度调制（multiple quadrature amplitude modulation，MQAM）和多进制相移键控调制（multiple phase shift keying modulation， MPSK）在接收端的信噪比（signal-to-noise ratio，SNR）表达式。然后对不同条件下的ASEP 性能做了数值仿真，仿真结果表明：随着发射天线或接收天线数的增加，系统的 ASEP性能得到了很好的改善，当使用 QPSK 调制，信噪比为6dB 时，（3,3；6）系统的误码率为2×10-3，（4,4；8）系统的误码率为2×10-4，（5,5；10）系统的误码率为2×10-5。%The vehicle-to-vehicle communication system in the internet of vehicle would play an extremely important role in future intelligent transportation system and become an indispensable part in future society. The average symbol error probability (ASEP) of vehicle-to-vehicle communication system employing transmit antenna selection (TAS) and orthogonal space-time block code (OSTBC) under double-Rayleigh fading channels is investigated in this paper. Based on the scalar additive white Gaussian noise (AWGN) channel approach, the exact form expressions of the signal-to-noise ratio (SNR) at the receiving end are derived for multiple quadrature amplitude modulation (MQAM), and multiple phase shift keying modulation (MPSK). Then the ASEP performance under different conditions was evaluated through numerical simulations. Simulation results show that: the ASEP performance can be improved with the increase of the number of transmit antennas or receive antennas, when SNR=6dB, the ASEP of (3,3;6) with QPSK is 2×10-3, (4,4;8) is 2×10-4, (5,5;10) is 2×10-5.
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