function noise = get_noise(len,noise_var,samples_per_chip,TC,FS_CONT,RX_BW)n_run = 5;ALPHA_N = ceil(len/2/samples_per_chip/n_run); %make it integer multipleT     = TC;Nt    = T*FS_CONT;Scale = (2*RX_BW)/FS_CONT;%try to get close to a power of 2N = ALPHA_N * Nt;target_N = 2^ceil(log2(N));ALPHA_N = ceil(target_N/Nt);noise = zeros(1,ALPHA_N*2*samples_per_chip*n_run);for i=1:n_run    %noise = sqrt(noise_var)*(randn(1,length(rx_uoi)));    [noise_r noise_i] = ...        randn_bl(ALPHA_N,T,Nt,RX_BW,noise_var*Scale);        start = (i-1)*2*ALPHA_N*samples_per_chip+1;    noise(start:start+ALPHA_N*samples_per_chip-1)=noise_r;    noise(start+ALPHA_N*samples_per_chip:start+2*ALPHA_N*samples_per_chip-1)=noise_i;        %noise = [noise noise_r noise_i];    clear noise_r;    clear noise_i;endnoise = noise(1:len);return;