orthogonal 互相垂直；直角正交 orthogonal code division multiplexing (OCDM) 正交码分复用 orthogonal frequency division multiplexing (OFDM) 正交频分复用 ..
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Pilot and information symbols are transmitted simultaneously by an orthogonal coed division multiplexing (OCDM) scheme, which obviously enhances the efficiency of system.
不同于以往的有数据辅助的同步算法,本算法在发射端通过正交码分复用(OCDM)的方式同时发送训练符号序列和信息符号序列。
参考来源 - 脉冲超宽带通信系统接收技术的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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.
本文通过MATLAB编程实现正交频分复用（OFDM）的系统仿真，系统采用卷积码和交织码级连的差错控制编码。
This test realized emulational system of OFDM through MATLAB programming, adopted error control coding of concatenation of convolutional codes and interlaced codes.
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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