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中文摘要：
为了保证在快速双选衰落信道下的有效数据传输，提出了一种新颖的时频双差分空时编码正交频分复用（OFDM）技术．该技术通过分别在OFDM系统的子栽波之间和OFDM符号之间引入差分空时编码，实现了在系统时域和频域上的差分调制．文中同时给出了相应的准最优译码算法，并对系统性能进行了分析和计算机仿真．结果表明，该技术在快速双选衰落信道下能够保持良好的误码率性能．
英文摘要：
Doppler shift gives rise to time-selectivity, while multipath propagation introduces frequency-selectivity in mobile links. In order to guarantee the effect data transmission in fast time-selective and frequency-selective （or doubly-selective） fading channel, a novel time-frequency double differential spacetime coded OFDM technique was proposed, in this technique, double differential space-time coding is introduced into both time domain and frequency domain in an OFDM system. A corresponding sub-optimal decoding algorithm was also derived. The performance analysis and computer simulation prove the robustness of the new system to fast doubly-selective fading.
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