frequency expander. Matlab code for expander.When x is a vector, this function adds L-1 after each element of x.

When x is a matrix, each column of it treated as vector and expanded L

fold.



SQUARE-ROOT RAISED-COSINE PULSE: h=sr_cos_p(N,L,alpha)

This function generates a square-root raised-cosine pulse of length N+1.

There are L samples per symbol period.

alpha is the roll-off factor.