在宽带OFDM系统中对正交空时分组码方案进行了研究,根据A lmouti方案的译码原理给出了在正交空时分组码传输的频率选择性衰落信道条件下接收机输出瞬时信噪比的一般表达式,同时分两种情况进一步分析了其最小距离球界的符号差错性能。结果表明,在系统发送天线数、接收天线数及多径数目乘积较小的情形下,系统可以达到最大的分集增益。 Orthogonal space-time block coding schemes are studied in wideband OFDM systems. According to the decoding principle of Almouti scheme, the receiver output instantaneous signal-to-noise Ratio of the general expression, at the same time in two cases further analysis of the symbolic error performance of the minimum distance sphere. The results show that the system can achieve the maximum diversity gain under the condition of small number of transmitting antennas, receiving antennas and multipaths.