本文首先介绍了两种协作方式与OFDM框架，并结合OFDM技术进行了系统仿真，对比分析了OFDM系统与CRC编码OFDM系统与卷积码编码OFDM系统仿真性能。-two methods to realize cooperative diversity in OFDM systems are proposed　simulations using OFDM techniques are performed　and the performance of the CRC coding OFDM system and convolutional coding OFDM system are analyzed.