Rayleigh fading showing better accuracy than AWGN channel

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Abdul Rahim
Abdul Rahim 2022-8-5
回答： Sachin Lodhi 2023-9-29
In the plots obtained during simulation, I found that performance of model in two tap Rayleigh flat fading channel was better than AWGN channel. What might be the reason? In order to cross check the code, in the two taps for Rayleigh flat fading coefficients, I gave the coefficients as one and zero inorder to check whether AWGN channel result is obtained. I got the exact AWGN channel result.

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Sachin Lodhi
Sachin Lodhi 2023-9-29
Hi Abdul,
Based on my understanding, it seems that you are seeking an explanation regarding why a two-tap Rayleigh flat fading channel is showing better accuracy compared to an AWGN channel, and why they appear to be the same upon cross-checking.
Regarding the first question, a two-tap Rayleigh flat fading channel can show better accuracy than an AWGN channel due to the following reasons:
  1. Diversity gain: Rayleigh fading channels provide diversity gain, improving system performance compared to AWGN channels that lack diversity gain.
  2. Frequency selective fading: Rayleigh fading channels can exhibit frequency-selective fading, where different frequency components experience varying fading characteristics, enhancing system performance compared to AWGN channels.
Regarding your second question, the real-world Rayleigh fading channels typically have multiple taps contributing to the fading effect. Using only two taps with coefficients of one and zero may not capture the full complexity of the fading process, resulting in a similar outcome to an AWGN channel.
I hope this explanation clarifies the differences between the two channels and addresses your concerns.

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