function symbol_rx = receiver (symbolTx,G);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% %
%% Name: receiver.m %
%% %
%% Description: In this function, the sampling of the signal which %
%% has arrived from the channel is realised.It is done with the %
%% FFT function. Before that, the Cyclic Prefix must be cleared %
%% which was added in the transmitter. %
%% %
%% Parameters: The arriving symbol and the size of the CP. %
%% %
%% %
%% Result: It gives back the chain of bits corresponding to the %
%% sent data. It is necessary to decode them now. %
%% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Nfft = 256;
Tx = 0; % Indicating that we are not transmitting.
% First, we must remove the CP.
symbol_ofdm_rx = cyclic(symbolTx,G,Tx);
% After removing the CP, we have to inverse the IFFT, logcally by FFT.
symbol_rx = fft(symbol_ofdm_rx,Nfft) ./ sqrt(Nfft);
