hi

i am working on OFDM .....i can represent the overlapping subcariers

using the following code

x = -60:0.01:60

for i=2:1:6 %

Y=(dn(i)*sinc(x-i));

Y1=Y+Y1;

plot(x,Y,'b--');

hold on;

end

where dn is array of complex numbers that are QAM modulated.......i

want to ask that multiplying the sinc function with a complex numbers

results in some of the subcarriers on the opposite side of axes(due

to negative number) how to plot the absolute log amplitude of the

signal

and secondly how should i plot the normalized power spectral density

of this signal ......will this code be ok

Pyy = ((abs(Y).^2 )/ 16384);

y1*log10(Pyy);

plot(x,y1,'r');

axis([-60 60 -100 0 ]);

thanx .

Regards,