中文摘要：

该文提出一种把循环延迟分集应用在分组线性预编码的新方案。该方案首先应用循环延迟分集来虚拟一个多径时延扩展的信道，在此基础上应用分组线性预编码以获得频率分集增益。该方案的译码复杂度相对较低，可以针对不同的信道模型有相应的编码方案，至少能获得与空时编码同样的分集增益M（M为发射天线数），且信道估计相对简单，不降低传输码率。该方案结合空时分组码可构造出新的空时频编码方案。仿真结果表明，该方案具有良好的译码性能。

英文摘要：

This paper proposes a new scheme that introduces cyclic delay diversity into Grouped Linear Constellation Precoding（GLCP） in an OFDM-based systems. By using cyclic delay diversity, a virtual delay spreaded channel can be get, and multipath diversity can be picked up by employing the grouped linear constellation precoding. This new scheme enables low decoding and equalization complexity. According to different channel models, different coding schemes can be designed, and at least get the same spatial diversity as space-time coding with equal number of transmit antennas. It is applicable to any number of transmit antennas with no loss in rate, too. Incorporated with STBC, a new STF coding can be constructed. Simulations reveal the performance merits of the new schemes.