?? fft_cp_rx_blk.m
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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);
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