MATLAB: The following Matlab code runs only half of the for loop. Can anyone help me figure out the problem

image processingsdr

Here is the part of the matlab Code that I was working for an SDR development.
In the following code, when the ind in the for loop below exceeds four or more than
half fo the loop, it stops and gives me an error.
Can someone help me and let me know the reason why it happens in MATLAB.
// The code begins here.
NumFrames =10;
%% Build OFDM Modulator
FFTLength = 64;
NumGuardBandCarriers = [6; 5];
NumDataCarriers = 48;
CyclicPrefixLength = 16;
PilotCarrierIndices = [12;26;40;54];
NumOFDMSymInPreamble = 5;
NumBitsPerCharacter = 7;
SampleRate = 20e6;
Fs = SampleRate;
msgInBits = repmat(randi([0 1], NumDataCarriers, 1),10160, 1);
PayloadBits = msgInBits(:);
MSDU = ceil(length(PayloadBits)/(NumFrames*NumDataCarriers));
txData = zeros(0,1);
for ind = 0 : (NumFrames-1)
framebody = PayloadBits((ind*MSDU*NumDataCarriers)+1:(NumDataCarriers*MSDU)*(ind+1),:);
txData = [txData; framebody];
PayloadBits((ind*MSDU*NumDataCarriers)+1:(NumDataCarriers*MSDU)*(ind+1),:)=[];
if(ind == 4) // When Ind exceeds more than half the loop, it creates error message.
return
end
end

Best Answer

  • PayloadBits((ind*MSDU*NumDataCarriers)+1:(NumDataCarriers*MSDU)*(ind+1),:)=[];
    This line changes the size of PayloadBits, but you have set up MSDU, NumDataCarriers, and ind based on the initial size of PayloadBits. Will it work if you omit this line? i.e.
    for ind = 0 : (NumFrames-1)
    framebody = PayloadBits((ind*MSDU*NumDataCarriers)+1:(NumDataCarriers*MSDU)*(ind+1),:);
    txData = [txData; framebody];
    end
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