本文给出了几种低码率空时网格码的好码。
In this paper, some optimum low rate space-time trellis codes are proposed.
针对这种情况，本文给出了一种空时网格码的正交设计方法。 这种方法可以用来构造大天线数目的码字，从而避免了繁琐的码字搜索过程。
So we put forward an orthogonal method which can be used to design the STTC with large number of transmit antennas and avoid the complicated search for the code.
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.
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.
给出了TCMST块码的网格球解码算法，并对TCMST块码的性能进行了仿真，与其他空时块码做了比较，证实了TCMST块码的性能优越性。
Finally, the performance merit of TCMST block code is confirmed by Monte Carlo simulations and compared with other space-time block codes.
与同速率的满秩网格空时码相比，它能获得更好的误码性能，并且实现简单。
Compared with the full rank space-time trellis code (FR-STTC) with the same transmission rate, it can provide a better performance and a lower realization complexity.
基于OFDM(正交频分复用)系统，提出了一种新的空频时三维编码，将网格编码调制和差分空时分组码进行组合链接设计。
Based on OFDM system, a novel space-frequency-time code which combined trellis-coded modulation with differential space-time block code was proposed.
基于OFDM(正交频分复用)系统，提出了一种新的空频时三维编码，将网格编码调制和差分空时分组码进行组合链接设计。
Based on OFDM system, a novel space-frequency-time code which combined trellis-coded modulation with differential space-time block code was proposed.
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