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正交空时/空频编码只有在发射天线数为2时才能进行满速率发射。当天线数大于2时,将循环延迟分集和空时编码相结合可在保持满速率发射的同时提高系统的性能,但是循环延迟分集和空频编码相结合却不能较好地提高系统性能。为此本文对循环延迟分集进行改进,将其和空频编码相结合在满速率发射的前提下仍能提高系统的频率分集增益。仿真结果表明,发射天线数大于2时,该方法提高了系统的分集增益,同时降低了误码率。
Orthogonal space-time / space-frequency coding can transmit at full rate only when the number of transmit antennas is two. When the number of antennas is more than 2, the combination of cyclic delay diversity and space-time coding can improve the performance of the system while maintaining full-rate transmission. However, the combination of cyclic delay diversity and space-frequency coding can not improve the system performance. Therefore, this paper improves the cyclic delay diversity, and combines it with the space-frequency coding to improve the system’s frequency diversity gain under the premise of full-rate transmission. The simulation results show that when the number of transmitting antennas is greater than 2, the proposed method improves the system diversity gain and reduces the bit error rate.