OFDM using Hadmard Transform and DCT.rar_DCT OFDM_hadamard ofdm

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % Function name (ofdm_demodulating) % Is used to perform demodulation on modulating data points %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % ******** % *INPUTS* % ******** % demodIn ------ Modulator input (which is a serial bit stream (1,[])) % modTypeVal ------ Modulation type value which determine the type of % modulation that will be used case1#(BPSK)& % case2#(QPSK)& case4#(16QAM) % k ------ Number of bits per sub-carrier (k=1 for BPSK, k=2 for QPSK, % and k=4 for 16-QAM) % ********* % *OUTPUTS* % ********* % demodOut ------ Output from modulator (which is a serial modulated % Signal %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% function [demodOut] = ofdm_demodulating(demodIn,modTypeVal,k) M=2^k; if modTypeVal == 1 %BPSK modulation % Demodulate using BPSK. rxMsgSym = pskdemod(demodIn,M,0,'gray'); % Symbol-to-Bit Mapping % Undo the bit-to-symbol mapping performed earlier. msgrx = de2bi(rxMsgSym,'left-msb'); % Convert integers to bits. % Convert msgrx from a matrix to a vector. msgrx = reshape(msgrx.',numel(msgrx),1); demodOut=msgrx; elseif modTypeVal == 2 %QPSK modulation % Demodulate using QPSK. rxMsgSym = pskdemod(demodIn,M,0,'gray'); % Symbol-to-Bit Mapping % Undo the bit-to-symbol mapping performed earlier. msgrx = de2bi(rxMsgSym,'left-msb'); % Convert integers to bits. % Convert msgrx from a matrix to a vector. msgrx = reshape(msgrx.',numel(msgrx),1); else modTypeVal == 4 %16QAM modulation % Demodulate using 16QAM. rxMsgSym = qamdemod(demodIn,M,0,'gray'); % Symbol-to-Bit Mapping % Undo the bit-to-symbol mapping performed earlier. msgrx = de2bi(rxMsgSym,'left-msb'); % Convert integers to bits. % Convert msgrx from a matrix to a vector. msgrx = reshape(msgrx.',numel(msgrx),1); end demodOut=msgrx.';