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hai John, here is some code for your BPSK mod-demod. it is not at all general and works for only two pns. It has to slightly modify for 3 or more pns. i think it will help you. Its just an illustration. %--------------------------- msg1=[1,-1,1,1,-1,1,1,-1,1] msg2=[-1,-1,-1,1,1,1,-1,-1,1] pn1=[1,-1,1,-1,1,-1,1,-1]; pn2=[-1,-1,1,1,-1,-1,1,1]; carrier=sin(linspace(0,1,20)*2*pi*2); %Spreading cdma1=reshape((carrier'*reshape(pn1'*msg1,1,8*9)),8*9*20,1); cdma2=reshape((carrier'*reshape(pn2'*msg2,1,8*9)),8*9*20,1); %Mixing cdmaa1+cdma2; %Despreading de_msg1=int8(pn1*reshape(carrier*reshape(cdma,20,8*9),8,9)/76) de_msg1=int8(pn2*reshape(carrier*reshape(cdma,20,8*9),8,9)/76) %---------------------------- -- Best Wishes RAVIKIRAN.D.N --- In , "john vasalos" <john_vasalos@h...> wrote: > Hello > > I have a very urgent problem and i need some help. I need to make a program > that will use LMS algorithm to detect 2 users in a system that uses bpsk > modulated PN sequence. I have made Pn sequence generator to spread and > despread the message but haven't still managed to make it work with the bpsk > modulation. Please if you have any codes or if you have any suggestion as to > where i should search or advice of what i should do, please help because my > situation is very urgent. If someone wants me to send my code and suggest > any solution please droop me an email. > > If you have please do help > > Best Regards |