Rayleigh Fading

1. What is Rayleigh fading model?
2. What causes Rayleigh fading?
3. What is the difference between Rayleigh and Rician fading?
4. Is Rayleigh fading fast fading?

What is Rayleigh fading model?

Rayleigh fading models assume that the magnitude of a signal that has passed through such a transmission medium (also called a communication channel) will vary randomly, or fade, according to a Rayleigh distribution — the radial component of the sum of two uncorrelated Gaussian random variables.

What causes Rayleigh fading?

Rayleigh fading is caused by multipath reception. The mobile antenna receives a large number, say N, reflected and scattered waves. Because of wave cancellation effects, the instantaneous received power seen by a moving antenna becomes a random variable, dependent on the location of the antenna.

What is the difference between Rayleigh and Rician fading?

Rayleigh fading is most applicable when there is no dominant line-of-sight propagation between the transmitter and receiver. Rician model considers that the dominant wave can be a phasor sum of two or more dominant signals, e.g. the line-of-sight, plus a ground reflection.

Is Rayleigh fading fast fading?

Frequency-flat, fast Rayleigh fading may be considered the most critical dis- turbance in wireless communication systems. In its most general form, it can be modeled as a multiplicative time continuous random (zero-mean complex Gaussian) distortion of the transmitted signal.