根据不同的传输需求，正交线性空时弥散码的形式还可以灵活变化。
Orthogonal linear dispersive space time code can also be used as an adaptive one for different application requirement.
目前，一种普遍的解决方法是将空时码与正交频分复用（OFDM）相结合，但需要假定信道变化缓慢，从而有足够的时间通过发送训练序列来进行信道估计。
Now, a general solution is that combining STC with OFDM, but it is supposed that the channel changes slowly, so there is enough time to transmit the training sequence for channel estimation.
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.
针对多输入多输出系统中现有的线性分散(LD)空时码编、解码复杂度高的问题，提出了一类正交线性分散(old)空时编码。
Focusing on the problem that existing linear dispersion (LD) space-time codes have a high encoding and decoding complexity, a type of orthogonal linear dispersion (OLD) space-time codes is 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.
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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