% forget tcp.mat!  It was 8MB, which we'd rather not send around
% instead, just generate the signal yourself with this.
% the signal we are interested in doing an FFT on is
% totalsignoise.  Of course it may be easier to debug using your
% own signal, but this is the final test of your project

n=linspace(1,480000,480000); 
t41=exp(2*pi*j*n*4100/48000);
t=0:1/48000:10-(1/48000);
ch=chirp(t,100,10,10000);
t15k = exp(2*pi*j*n*15000/48000);
totalsig = 1000*t41 + 2000*ch;
totalsig(1:48000) = totalsig(1:48000) + 300*t15k(1:48000);
totalsig(48000*3+1:48000*4) = totalsig(48000*3+1:48000*4) + 300*t15k(1:48000);
totalsig(48000*6+1:48000*7) = totalsig(48000*6+1:48000*7) + 300*t15k(1:48000);
ns = randn(1,480000) + j*randn(1,480000);
totalsignoise = totalsig+1000*ns;