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 symbolrec_time_symbol = ofdm_symbol(guard_interval+1:end);% The FFT of the time domain signal after the removal of cyclic prefixrec_symbol = fft(rec_time_symbol,num_subc);