this program is producing a STBC matrix of 8*4 32 times. how can i put them in a single matrix of 256*4 dimension??

clc;
clear;
close;

% QAM Modulator

sizeOfSignalConstellation = 16;                                    % Size of signal constellation

numberOfBitsPerSymbol = log2(sizeOfSignalConstellation);           % Number of bits per symbol

noOfBitsToProcess = 512;                                            % Number of bits to process

A=noOfBitsToProcess/sizeOfSignalConstellation;

B=4;

numSamplesPerSymbol = 1;                                           % Oversampling factor

rng default                                                        % Use default random number generator

vectorOfBinaryData = randi([0 1],noOfBitsToProcess,1);             % Generate vector of binary data

binaryTuples = reshape(vectorOfBinaryData,length(vectorOfBinaryData)/4,4);                     % Reshape data into binary 4-tuples

dataSymbolsIn = bi2de(binaryTuples);                               % Convert to integersdataMod = qammod(dataSymbolsIn,M,0);  % Binary coding, phase offset = 0

xx = qammod(dataSymbolsIn,sizeOfSignalConstellation,0,'gray');     % Gray coding, phase offset = 0

QamMatrix= vec2mat(xx,4); 

Eb_No = 2*(sizeOfSignalConstellation-1)/3;                          %energy of the sysmbols

% Alamouti SPace Time Block Coder for four transmit Antennas
% Transmitters

SS=zeros(256,4);

for i= 1:A
   for j=1:32
   ss = QamMatrix(i,:);
   STBC(:,:,i)     =  [ss(1) ss(2) ss(3) ss(4); ...
                  -1*ss(2) ss(1) -1*ss(4) ss(3); ...STBC
                  -1*ss(3) ss(4) ss(1) -1*ss(2); ...
                  -1*ss(4) -1*ss(3) ss(2) ss(1); ...
                  conj(ss(1)) conj(ss(2)) conj(ss(3)) conj(ss(4)); ...
                  -1*conj(ss(2)) conj(ss(1)) -1*conj(ss(4)) conj(ss(3));...
                  -1*conj(ss(3)) conj(ss(4)) conj(ss(1)) -1*conj(ss(2)); ...
                  -1*conj(ss(4)) -1*conj(ss(3)) conj(ss(2)) conj(ss(1))]; 
            T(:,:,j)=STBC(:,:,i);
            SS = reshape(T(:,:,j),8,4);
   end

[KSSV]

You can use reshape(STBC,256,4), but the order is important. Whats the necessity to reshape?

[Muhammad Awais Waheed]

i have tried this command but it does not work

[KSSV]

A = rand(8,4,32 ) ;
B = reshape(A,8*32,4) ;

[Jan]

@Muhammad Awais Waheed: "It does not work" is not useful to solve the problem. Please post a complete copy of the error message.

[Muhammad Awais Waheed]

@Jan Simon okay sir. i will do that right now

[Walter Roberson]

Muhammad Awais Waheed comments to KSSV

thank you very much for your help. really appreciate it sir.

[Walter Roberson]

Muhammad Awais Waheed comments to Jan Simon

when i used the above mentioned command by @KSSV than this is the error.

Error using reshape To RESHAPE the number of elements must not change.
Error in Untitled3 (line 51) X=reshape(STBC,8*32,4);

Answer 1

[Richard Fisher]

There is another end missing from you code. Assuming it should be added at the end, try changing:

SS = reshape(T(:,:,j),8,4);

to

SS(8*(i-1)+1:8*i,:) = STBC(:,:,i);

This gives a final SS matrix which is 256 x 4, although you'll have to verify if this the behaviour you want.

Also, I'm not sure what the purpose of the inner loop is - it seems like you're calculating the same thing 32 times.

[Muhammad Awais Waheed]

yes sir. i know the purpose of the inner loop. thank you. no it is not repeating the same thing 32 times. thank you for your answer.

[Muhammad Awais Waheed]

and its working