Hi, I am currently writing this programme to simulate the AWGN using the rand function in C and the polar box muller algorithm. I managed to simulate a series of random numbers of gaussian distribution with variance 1 and mean 0. I would like to now test using fft the power spectral density of this gaussian distribution of random numbers. Idealy this should show a straight line with a value of 1. How can I use fft in Matlab to help me acheive this? Currently what I did was to output 100 numbers into a textfile from the C programme I have. Then I read and store these numbers into a matrix in Matlab. I apply fft on this matrix of numbers and eventually then square the output.I then plot this output. However the graph has a value far from my ideal value of 1. Thank you.