Dear all;

Please look at this MATLAB code and help me to find error.

 Code dot - [expand] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 N = 20*10^3; % number of symbols M = 64; % size k = log2(M); % bits/symbol   % for 16-QAM Re = [-(2*sqrt(M)/2-1):2:-1 1:2:2*sqrt(M)/2-1];   Im = [-(2*sqrt(M)/2-1):2:-1 1:2:2*sqrt(M)/2-1];   k_QAM = 1/sqrt(10);   bdB = 3:1:13; % SNR range   sdB = bdB + 10*log10(k);   % binary to gray code   a = (0:k-1);   map = bitxor(a,floor(a/2));   [tt, ind] = sort(map);   for i = 1:length(bdB) c = rand(1,N*k,1)>0.5; % random 1's and 0's d = reshape(c,k,N).'; bd = ones(N,1)*(2.^((k/2-1):-1:0)) ; % conversion from binary to decimal   % real   cRe = d(:,(1:k/2)); e = sum(cRe.*bd,2); f = bitxor(e,floor(e/2));   % imaginary cIm = d(:,(k/2+1:k)); g = sum(cIm.*bd,2); h = bitxor(g,floor(g/2));   % mapping the Gray coded symbols into constellation modRe = Re(f+1); modIm = Im(h+1);   % constellation   mod = modRe + 1i*modIm; s = k_QAM*mod;   % noise   n = 1/sqrt(2)*(randn(1,N) + 1i*randn(1,N));   % reciever r = s + 10^(-sdB(i)/20)*n;   % demodulation   r_re = real(r)/k_QAM; r_im = imag(r)/k_QAM;   % rounding off     m = 2*floor(r_re/2)+1; m(m>max(Re)) = max(Re); m(mmax(Im)) = max(Im); n(n

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