waseem khan
Newbie level 1
- Joined
- Jul 24, 2012
- Messages
- 1
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,281
- Activity points
- 1,289
I want to do a comparison of power spectral density of BFSK,4FSK and 8FSK by using matlab baseband module "fskmod".Following is the code:
M = 2; freqsep = 32; nsamp = 4; Fs = 64;
x = randint(1000,1,M); % Random signal
y = fskmod(x,M,freqsep,nsamp,Fs); % Modulate.
ly = length
;
% Create an FFT plot.
freq = [-Fs/2 : Fs/ly : Fs/2 - Fs/ly];
Syy = 10*log10(fftshift(abs(fft)));
plot(freq,Syy)
With this configuration, I get a very good spectrum but when I change nsamp to 8 or any other value,multiple lobes startr to appear between two frequencies.
The confusion is in the understanding of the relation of nsamp and frequency separation. Could any one solve this confusion???
Regards,
Waseem Khan
M = 2; freqsep = 32; nsamp = 4; Fs = 64;
x = randint(1000,1,M); % Random signal
y = fskmod(x,M,freqsep,nsamp,Fs); % Modulate.
ly = length
;% Create an FFT plot.
freq = [-Fs/2 : Fs/ly : Fs/2 - Fs/ly];
Syy = 10*log10(fftshift(abs(fft
)));plot(freq,Syy)
With this configuration, I get a very good spectrum but when I change nsamp to 8 or any other value,multiple lobes startr to appear between two frequencies.
The confusion is in the understanding of the relation of nsamp and frequency separation. Could any one solve this confusion???
Regards,
Waseem Khan
