移动通信原理中信道的分类
移動通信原理中信道的分類：
Wide-sense stationary(WSS) channels 廣義平穩(wěn)信道
(1) 信道在短時間內(nèi)的衰落統(tǒng)計量是常數(shù)
(2）自相關(guān)函數(shù)取決于時間變量t和s，且只與時間間隔Δt=s-t有關(guān)
(3）The attenuations and phase shifts associated with signal components having different Doppler shifts are uncorrelated.
(WSS channels are US channels with respect to the Doppler shift v)
Uncorrelated scattering(US) channels 不相關(guān)散射信道
(1)自相關(guān)函數(shù)取決于頻率變量f和m，且只與頻率間隔Δf=m-f有關(guān)
(2)The attenuations and phase shifts associated with signal components having different delays are uncorrelated.
(US channels are WSS with respect to the frequency f)
WSSUS channels 廣義平穩(wěn)不相關(guān)散射信道
(1)Exhibit US in both the time delay and Doppler shift
(2)許多radio的信道可以被模型化為WSSUS信道
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