OFDM中结合延迟分集与空频编码的下行发射方案  

A Scheme of Joint Space Frequency Block Coding and Modified Cyclic Shift Diversity for Downlink Transmission

作　　者：周毅刚[1] 陆珺[1] 陈丽娜[2] 

机构地区：[1]哈尔滨工业大学电子与信息技术研究院,黑龙江哈尔滨150001 [2]上海华为技术有限公司,上海200120

出　　处：《通信技术》2009年第6期14-16,共3页Communications Technology

摘　　要：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。Data could be transmitted in full rate by two antennas in orthogonal space time block coding（OSTBC） or orthogonal space frequency block coding（OSFBC）. When the number of antennas is more than two, it could in combination of Cyclic Shift Diversity （CSD） with OSTBC, improve system performance and maintain the full rate. However, it couldn＇t achieve the same system performance in combination of CSD with OSFBC. This paper tells of a modified CSD method and proposes a scheme for downlink multi-antenna transmission diversity, which could increase the diversity gain by combining OSFBC with the modified CSD. The simulation results show that the proposed scheme could obtain the spatial diversity gain and the frequency diversity gain while improve the system performance in Block Error Rate.

关 键 词：发射分集 正交空频编码 循环延迟分集 多天线 

分 类 号：TN91[电子电信—通信与信息系统]