BCH CODE - with codeword length

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Waleed 2013-12-7

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评论： Walter Roberson 2013-12-7

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hey guys, i really need help at the following BCH CODE

it did not work with me, im stuck now

here is the instruction:

Before encoding, you need to convert your data u into a Galois field array using the command gf(u,1).
ugf=gf(u,1);
Then encode ugf into a codeword v, using bchenc(); that's the BCH encoder function. You don't need to generate any polynomial.
Add binary noise z to v mod-2 (XOR) to get y. In order to add the noise mod-2, you'll have to convert your binary noise z to a Galois field array using gf(z,1) just as you did u.
The xor and mod operators won't work with v, since v is a Galois field array (necessary for bchenc() and bchdec()).
Decode y using the BCH decoder function bchdec().
The output of bchdec() will be uhat.

f you look at the example in doc bchdec(), be careful not to use the same noise or entire code, because the example is not doing what I'm doing.

here is what i did

clc
clear
n = 63;
k = 30;
u = randi ([0,1],k);
ugf=gf(u,1);
v = bchenc(ugf,n,k);
z = randi ([0,1],k);
zgf = gf(z,1);
for i = 1:1:k
for j = 1:1:k
if v==zgf
y(i,j)=0
else
y(i,j)=1
end
end
end

any help please?

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Waleed 2013-12-7

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well, i improved the code. however, the problem is when i want to add binary noise z to v mod-2 (XOR).

it won't give me the right answer it gives me this error Undefined function 'mod' for input arguments of type 'gf'.

Error in final_projecthoward1 (line 16) v=mod(v,2)

here is my code, clc clear n = 63; k = 30;

    %  u---> ugf---->v
    u = randi ([0,1],n,k);
    ugf=gf(u,1);
    v = bchenc(ugf,n,k);
    % z ---> zgf
    z = randi ([0,1],k,n);
    zgf = gf(z,1);
    %the following loops to replace mod-2 for v
    for i = 1:k;
    for j = 1:n;
    if v(i,j)==0;
    y(i,j)=0;
    else
    y(i,j)=1;
    end
    end
    end
    %added V-mod2 to zgf
    y=y+zgf
    %here is U_hat
    u_hat=bchdec(y,n,k);