fft_cp_rx_blk.m

code for signal Processing in OFDM calculation.

function rec_symbol = fft_cp_rx_blk(ofdm_symbol,num_subc,guard_interval)
%------------------------------------------------------------
% IFFT and Circular Prefix Addition Block for Transmitter
% -------------------------------------------------------
% (EE359 Project: Andrew and Prateek)
% Inputs : 
%   ofdm_symbol    : received ofdm symbol from the channel
%   num_subc       : Number of Subcarriers
%   guard_interval : Guard Interval based on OFDM Symbol  
% Outputs : 
%   rec_symbol     : Received Frequency Domain Signal after
%                    removal of circular prefix and FFT.
% -----------------------------------------------------------


if (guard_interval > length(ofdm_symbol))
    error(' The guard interval is greater than the ofdm symbol duration ');
end

% The guard symbol (cyclic prefix) is removed from the ofdm symbol
rec_time_symbol = ofdm_symbol(guard_interval+1:end);

% The FFT of the time domain signal after the removal of cyclic prefix
rec_symbol = fft(rec_time_symbol,num_subc);