Hi,
I understand you would like to create a simple system where sender sends the data to the receiver, protecting it with error detection codes. Here is an example to demonstrate how you can achieve this:
SENDER:
% Convert the image to a binary stream
% Calculate parity bits for each 8-bit word
numWords = length(imageBinary) / 8;
parityBits = zeros(numWords, 1);
for i = 1:numWords
dataWord = imageBinary((i-1)*8 + (1:8));
parityBits(i) = mod(sum(dataWord), 2); % Even parity bit
end
% Append parity bits to the data stream (for simplicity, we append at the end)
transmittedData = [imageBinary; parityBits];
receivedData = transmittedData;
errorIndices = randperm(length(imageBinary), 10); % Introduce 10 random errors in the data part
receivedData(errorIndices) = ~receivedData(errorIndices);
RECEIVER:
% Separate the data and parity bits from receivedData for error checking
receivedDataBits = receivedData(1:length(imageBinary));
receivedParityBits = receivedData(length(imageBinary) + 1:end);
% Check for errors using parity bits
receivedParityBits = receivedData(end-numWords+1:end);
receivedData = receivedData(1:end-numWords);
numErrorsDetected = 0;
for i = 1:numWords
dataWord = receivedData((i-1)*8 + (1:8));
if mod(sum(dataWord), 2) ~= receivedParityBits(i)
numErrorsDetected = numErrorsDetected + 1;
end
end
numBitErrors = sum(imageBinary ~= receivedDataBits);
totalBits = length(imageBinary);
BER = numBitErrors / totalBits;
I hope this helps!
