Fading
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In wireless communications, fading is the variation of signal attenuation over variables like time, geographical position, and radio frequency. Fading is often modeled as a random process. In wireless
Frequency-selective time-varying fading causes a cloudy pattern to appear on a spectrogram. Time is shown on the horizontal axis, frequency on the vertical axis and signal strength as grey-scale intensity.
Rayleigh fading
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Rayleigh fading is a statistical model for the effect of a propagation environment on a radio signal, such as that used by wireless devices.
Fading
…Log-normal shadow fading Rayleigh fading Rician fading…
Densely built Manhattan has been shown to approach a Rayleigh-fading environment.