在几个波长 (λ=0.3m @ 1GHz) 的范围内,信号幅度 ( 包络 ) 的起伏可以达到几十 dB 平坦衰落信道 (Flat Fading Channel) – 信号的多径传输决定了信道的频率特性 假设发射频率为 ω 的正弦波,信号经过两路不同延时 ( 相同衰减 ) 在接收端 汇合成 x ( ...
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算法所用特征对平坦衰落信道具有衰落不变性，对频率选择性衰落信道也具有很强的抗多径能力。
The feature used in the algorithm is invariant with respect to flat fading, and can resist multipath fading of frequency-selecting channel in quite a few degree.
多天线和OFDM的结合极大地提高了系统容量，OFDM能为系统提供平坦衰落信道，而多天线则提供空间增益。
The combination of MIMO and OFDM greatly increases the system capacity in the sense that OFDM and MIMO can respectively provide flat fading channel and spatial gain.
算法所用的小波变换相位信息特征对平坦衰落信道具有衰落不变性，对频率选择性衰落信道也具有很强的抗多径能力。
The phase information of wavelet transform used in the algorithm is invariant with respect to flat fading, and can resist multipath fading of frequency-selecting channel in quite a few degree.
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