%***********************************************************%        This mfunction generates orthogonal complex 
%			exponential matrix [exp(j*2*pi*n*k/N)]%%        AUTHOR: Wenbin Luo%        DATE  : 04/27/01
%%        FUNCTION SYNOPSIS: %        y = fh(N,K)% %        Parameter Description: %        N			:  length N = 32  %        K			:  number of users%**********************************************************
function y = fh(N,K)

n = 0:1:N-1;
n = n';
k = 0:1:K-1;

n_k = n*k;
n_k = n_k';
%each row is a user code
y = exp(j*2*pi.*n_k/N);