中文摘要：

针对航空通信中基于差分酉空时调制的解码转发方案的译码错误问题,提出在中继点采用循环冗余编码（CRC）提高系统可靠性的方法.该方法在源节点和目的节点均配置多根天线,接收端使用最大化合并的方案以抵抗多径干扰,利用CRC提高误码性能,保证通信质量.仿真结果表明,在低速率数据传输的快衰落信道中,该方法有明显的编码增益.在BER为10-5处,有循环冗余编码的差分酉空时调制比无循环冗余编码的差分酉空时调制增加约4dB的编码增益.

英文摘要：

According to the decoding error of aeronautical communications combined with decode-and-forward collabora tion technology, this paper proposed a method to improve the reliability of cooperation schemes based on Differential Unitary Space-Time Modulation by applying the Cyclic Redundancy Check at the relay. Multiple antennas are set at the transmitting end and receiving end （source and destination nodes）. The maximum ratio combining scheme is applied at the receiving end （desti- nation node）. The method resisted multipath interference, improve error performance and guarantee communication quality. Simulation results indicate our method show evident coding gain in the frequency selective fading channel with low transmission rates. When BER= 10 -5, the proposed scheme has a 4dB coding gain compared with the scheme without CRC.