On Mar 25, 6:06*am, "m" <stuttbr...@hotmail.com> wrote:
> Hi everybody,
>
> I have a doubt that can be very obvious for you but it has driven me
> crazy. I want to know the performance of my demodulator by calculating the
> BER curve respect to the EbN0. For that, I input some signals at different
> EbN0 but how should I calculate the EbN0? My method for a complex signal,
> as I read several times, is:
>
> Eb = S/R; where S is the signal power and R is the data rate
> N0 = N/Fs where N is the variance^2 and Fs is the sampling frequency.
>
> However, I've also seen that N0 = N/B where B is the bandwidth of the
> channel. Comparing my BER curve with the theoretical one, it is quite far
> and I would like to be sure that my EbN0 calculation is 100% right and then
> check the demodulator.
>
> Could somebody please clear this point?
> Thank you very much
>
> Regards
> mary

Surprisingly, the explanation on the MathWorks' website is quite
good, and useful if you are simulating an AWGN channel in
discrete-time.

http://www.mathworks.com/support/sol...lution=1-19I4S

Hope this helps,
Julius