26 lines
1.1 KiB
Matlab
Executable File
26 lines
1.1 KiB
Matlab
Executable File
function [sig, sig_f] = OFDM_TX_FRAME(num_carriers,num_zeros,prefix_length,num_symbols_frame,preamble_length)
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% sig - output signal
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% sig_length - output signal length
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% num_carriers - number of sub-carriers
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% num_zeros - number of zero carriers minus 1 (DC)
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% prefix_length - length of cyclic prefix
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% num_symbols_frame - number of symbols per OFDM frame
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% preamble_length - length of 4-QAM preamble
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num_useful_carriers = num_carriers - num_zeros -1;
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sig = zeros(1,(num_carriers+prefix_length)*num_symbols_frame);
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sig_f = zeros(num_symbols_frame,num_useful_carriers);
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for k=1:preamble_length
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QAM4_preamble = QAM_MOD(4,floor(256*abs(rand(1,num_useful_carriers/4))));
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sig((k-1)*(num_carriers+prefix_length)+1:k*(num_carriers+prefix_length)) = OFDM_TX(num_carriers,num_zeros,prefix_length,QAM4_preamble);
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sig_f(k,:) = QAM4_preamble;
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end
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for k=preamble_length+1:num_symbols_frame
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QAM_data = QAM_MOD(256,floor(256*abs(rand(1,num_useful_carriers))));
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sig((k-1)*(num_carriers+prefix_length)+1:k*(num_carriers+prefix_length)) = OFDM_TX(num_carriers,num_zeros,prefix_length,QAM_data);
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sig_f(k,:) = QAM_data;
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end
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