（Root Raised Cosine Filter）根升余弦滤波器的MATLAB代码,Root Raised Cosine Filter MATLAB code

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