function ofdm_symbol = ifft_cp_tx_blk(inp_symbol,num_subc,guard_interval)%------------------------------------------------------------% IFFT and Circular Prefix Addition Block for Transmitter% -------------------------------------------------------% (EE359 Project: Andrew and Prateek)% Inputs : %   inp_symbol     : Input Symbol from all the Subcarriers%   num_subc       : Number of Subcarriers%   guard_interval : Guard Interval based on OFDM Symbol  % Outputs : %   ofdm symbol    : Output of IFFT and Guard Interval% -----------------------------------------------------------ofdm_symbol = ifft(inp_symbol,num_subc);if (guard_interval > length(ofdm_symbol))    error(' The guard interval is greater than the ofdm symbol duration ');end% The guard symbol is the copy of the end of the ofdm symbol to the beginning% of the ofdm symbol.guard_symbol = ofdm_symbol(end-guard_interval+1:end);   %???% Add the cyclic prefix to the ofdm symbolofdm_symbol = [guard_symbol ofdm_symbol];