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中文摘要：
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。
英文摘要：
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.
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