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研究带删除卷积码的 8、16、32差分幅 /相移键控 (DAPSK)调制 .在加性高斯白噪声 (AWGN)和 Rayleigh衰落信道下比较了其与 16 QAM相干调制器的性能 .与相干系统形成对照 ,非相干系统无需导频符号 .对于多种衰落条件优化了 DAPSK系统的参数 (如环比 ) ,用删除卷积码做信道编码 ,非相干8DAPSK在 AWGN和 Rayleigh衰落信道下的性能只比 8/16 (或 8/2 4 )码率的 16 QAM差约 1d B.这意味着对 Rayleigh衰落信道 ,可采用简单的非相干解调以避免复杂的载波提取 .
The 8,16,32 differential amplitude / phase shift keying (DAPSK) modulation with a deconvolution convolutional code is investigated, and its performance with a 16 QAM coherent modulator is compared under additive white Gaussian noise (AWGN) and Rayleigh fading channels. In contrast to coherent systems, non-coherent systems do not require pilot symbols. DAPSK system parameters (such as ring ratio) are optimized for a variety of fading conditions, and channel convolutional codes are used for channel coding. Non-coherent 8DAPSK is used for AWGN and Rayleigh fading channels The performance is only about 1d less than 16 QAM for an 8/16 (or 8/2 4) bit rate, which means that for Rayleigh fading channels, simple non-coherent demodulation can be used to avoid complex carrier extraction.