qpsk_modulation.m

% function [tx_symbols, encoded_bits] = qpsk_modulation(bits)
%     % QPSK Modulation function with Hamming encoding
%     % Input: bits - Input bits to be modulated
%     % Output: tx_symbols - Modulated QPSK symbols
%     %         encoded_bits - Encoded bits with Hamming code
% 
%     % Ensure the input bits length is a multiple of 4 for Hamming(7,4) encoding
%     n = length(bits);
%     if mod(n, 4) ~= 0
%         error('Input bits length must be a multiple of 4');
%     end
% 
%     % Encode input bits with Hamming code
%     encoded_bits = encode(bits, 7, 4, 'hamming/binary');
% 
%     % Generate QPSK symbols from encoded bits
%     symbols_I = 2*encoded_bits(1:2:end) - 1; % Map bits to I-channel: 0 -> -1, 1 -> 1
%     symbols_Q = 2*encoded_bits(2:2:end) - 1; % Map bits to Q-channel: 0 -> -1, 1 -> 1
% 
%     % Combine I and Q channel to form complex symbols
%     tx_symbols = symbols_I + 1j * symbols_Q;
% end


function [tx_symbols, encoded_bits] = qpsk_modulation(bits)
    % QPSK Modulation function with Hamming encoding
    % Input: bits - Input bits to be modulated
    % Output: tx_symbols - Modulated QPSK symbols
    %         encoded_bits - Encoded bits with Hamming code

    % Encode input bits with Hamming code
    encoded_bits = encode(bits, 7, 4, 'hamming/binary');

    % Generate QPSK symbols from encoded bits
    symbols_I = 2*encoded_bits(1:2:end) - 1; % Map bits to I-channel: 0 -> -1, 1 -> 1
    symbols_Q = 2*encoded_bits(2:2:end+1) - 1; % Map bits to Q-channel: 0 -> -1, 1 -> 1

    % Combine I and Q channel to form complex symbols
    tx_symbols = symbols_I + 1j * symbols_Q;
end