Florian Kaltenberger
996ecbe55c
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5153 818b1a75-f10b-46b9-bf7c-635c3b92a50f
20 lines
761 B
Matlab
20 lines
761 B
Matlab
function [sig,sig_length] = OFDM_TX(num_carriers,num_zeros,prefix_length,input)
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% OFDM Transmitter - DC removed
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% sig is the output signal
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% length is the length of the output signal
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% num_carriers - number of sub-carriers (power of 2)
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% num_zeros - number of zeros minus 1 (DC) in output spectrum (odd)
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% prefix_length - length of cyclic prefix
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% input - input dimensions (length = number_carriers - num_zeros - 1)
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if (length(input) + num_zeros + 1 ~= num_carriers)
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fprintf('error in lengths\n');
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return;
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end
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ext_input = [0 input(1:length(input)/2) zeros(1,num_zeros) input((1+length(input)/2) : length(input))];
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output_1 = ifft(ext_input);
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sig = [output_1((num_carriers - prefix_length + 1) : num_carriers) output_1];
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sig_length = length(sig);
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