数字调制就是把数字基带信号的频谱搬移到高频处，形成适合在信道中传输的带通信号。基本的数字调制方式有振幅键控（ASK）、频移键控（FSK）、绝对相移键控（PSK）、相对（差分）相移键控（DPSK）。在接收端可以采用想干解调或非相干解调还原数字基带信号。 -Digital modulation is the spectrum shifting to high frequency digital baseband signals, suitable for the formation of ban

pi4 qpsk的付费论文，讲述基本调制解调的分析和衰落信道中性能的分析，差分实现原理，非常有用(Pi4 QPSK Pay Paper, describes the analysis of basic modulation and demodulation and performance analysis in fading channels, differential realization principle, very useful)

pi4 qpsk的付费论文，讲述基本调制解调的分析，差分实现原理，非常有用(Pi4 QPSK Pay Paper, describes the analysis of basic modulation and demodulation and performance analysis in fading channels, differential realization principle, very useful)