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出 处:《高技术通讯》2007年第2期130-134,共5页Chinese High Technology Letters
基 金:863计划重庆专项项目(2003AA12331007)和国家自然科学基金重点项目(60332030,60272079)
摘 要:结合正交空时码的分集优势,将正交空时码应用到差分空频系统中,提出了一种基于循环延迟分集的多流差分空时频编码新方法,在差分系统中同时获得了空间和频率分集。该差分编码方法在满足信道的时间和频率选择性前提下,只需要发送很少的参考矩阵用于非相干检测。仿真结果表明,正交空时码的引入,可以有效提高整个系统的分集增益,从而在很大程度上改善整个差分MIMO-OFDM系统的误码性能。A new muhistream differential space-time-frequency (DSTF) coding structure was proposed through the combination of orthogonal space time code and CDD based differential space frequency systems, which obtained space-time and spacefrequency diversity simultaneously. The structure can well satisfy the time and frequency selectivity of the channel and only need to send a few reference matrix for the differential detection. Based on the simulation in the frequency selective channel, it is concluded that the orthogonal space time code can introduce much more space-time diversity into the differential CDD structure, thus highly improve the error performance of the whole MIMO-OFDM system.
关 键 词:多输入多输出 正交频分复用 差分空时频 循环延迟分集
分 类 号:TN914[电子电信—通信与信息系统]
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