is this matlab code of 8psk ??

l=100000; %L length of si the input one dimension array

nni=randn(1,l);%generate L by L array of random scalare

si=randsrc(1,l,[+1,-1;.5,.5]);%generate 1 by L array of -1&+1

snr=[0:15]; 

for i=1:16

errorcounter=0;

stdn=sqrt(10^(-snr(i)/10))

   ni=nni*stdn;% ni is 1 by L dimension

      for m=1:l
          ri(m)=ni(m)+si(m);
          if ri(m)>0
          sdi(m)=1;
          elseif ri(m)<=0
          sdi(m)=-1;
          end
          if sdi(m)~=si(m)
          errorcounter=errorcounter+1;

          end
      end
      ber(i)=errorcounter/l
  end

semilogy(snr,ber,'r','LineWidth',2)
xlabel('snr db');ylabel('ber');grid;

[mary]

can anyone help??

[Image Analyst]

What is 8psk?

[mary]

8 phase shift key modulation

[Rick Rosson]

1. Please use proper indentation in your code.
2. Please do not use lower-case l as a variable. It looks almost the same as the numeral 1 and is very confusing. Use upper-case L instead.
3. Please add comments explaining what each variable represents.

Thanks.

[mary]

okay thanks for the notes

Answer 1

[Rick Rosson]

No. As far as I can tell, this code is BPSK, not 8PSK. Also, there are several mistakes in the code.

[mary]

thank you .. well can you plz give me an 8psk code .. i cant find one >> does the 8psk code also have inphase and quadrature symbols .. as far as i know it uses two qpsk is that right??

[Walter Roberson]

I get the impression that you are supposed to write the 8psk code, not copy it from someone else.

[mary]

i just wanna understand how 8psk works .. an explination not matlab code .. but the code helps me to understand faster thats why i asked for a code ..

[Walter Roberson]

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