...射成n个符号, 即8k=n×m(对于64QAM, 是把3字节的码流映射成4个符号), 映射后的符号的最高2比特 进行差分编码 ( differential code ), 编码后形成Ik和Qk分量, 进入具有均方根升余弦滚降特性(滚降系数α=0.15)的滤波器进行基带整形, 然后与其他符号位一起进入QAM调...
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该方法在时域进行差分编码，而在频域进行空频编码以获得分集增益。
The differential coding is performed in the time domain, while the space-frequency coding is processed in the frequency domain to achieve the diversity ga.
压缩时，先对测试向量集进行差分运算，然后采用CPRL码编码差分向量序列。
During compression, it generates difference vectors from test data and then encoding the vectors with CPRL 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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