Rayleigh Fading Channel Generation

This .m file generates rayleigh channel model based on Inverse DFT method.

This function generates normalized rayleigh samples based on Inverse DFT method as was proposed by David J. Young, and Norman C. Beaulieu "The Generation of Correlated Rayleigh Random Variates by Inverse Discrete Fourier Transform, "
Sample Use:
chan=genRayleighFading(512,ceil(10000/512),1e4,100);
chan=chan(1:10000);
where 10000=number of needed samples
parameters:
fftsize: size of fft which used
numBlocks: number of samples/fftsize
fs: sampling frequency(Hz)
fd: doppler shift(Hz)