中文摘要：

针对空时编码不能直接应用于非平坦衰落信道的问题。提出了将正交频分复用（OFDM）与多输入多输出系统（MIMO）相结合的方案。建立了OFDM-STC系统模型。OFDM系统通过把信息分散到许多载波上,降低了各子载波的信号速率,使符号周期比多径迟延长,从而能够减弱多径传播的影响。利用Matlab软件对各系统的性能进行了仿真,仿真结果表明,结合后的OFDM-STBC系统较传统的STBC系统,可靠性获得了提升。

英文摘要：

According to the problem that Space time coding can not be directly applied to a flat fading channel.The scheme of combining OFDM with MIMO was put forward.The model of OFDM-STBC system was established.Information was distributed to many carrierin OFDM system,the sub-carrier signal rate was reduced greatly,the symbol period was later than multipath extension,in order to weaken the effects of multipath propagation.And the system performancewas simulated by using Matlab software,the simulation results show that reliability promotion ofthe OFDM-STBC system was improved greatly than the traditional STBC system.