然后对网格空时码（STTC）和分组空时码（STBC）的编译码原理、特点和性能进行了全面的分析；

Then the encoding and decoding theories, features and performances of STBC and STTC are detailed in all aspects.

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但对分集增益而言，网格空时码和分组空时码均可达到系统所能提供的最大分集增益，而分层空时码由于受实现方式的制约，只能得到其中一部分分集增益。

But as to the diversity gains, STCM and STBC can achieve the maximum diversity that the system provides, while LST only obtains a small part of it because of its limited application.

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利用分组干扰抑制的方法，通过合理地设计空时码的发射码矩阵和对阵列天线进行了子阵划分，提出了一种新的混合型的空时编码方法。

A new hybrid space-time coding approach is presented in this paper. The properly designed code matrix and group interference suppression method are used in this approach.

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