Florian Kaltenberger
0862a82b4c
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5207 818b1a75-f10b-46b9-bf7c-635c3b92a50f
43 lines
1.5 KiB
Matlab
43 lines
1.5 KiB
Matlab
function [sig, sig_f] = OFDM_TX_FRAME_MIMO(num_carriers,num_zeros,prefix_length,num_symbols_frame,preamble_length,num_ant)
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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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% numant - number of antennas
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num_useful_carriers = num_carriers - num_zeros -1;
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if (num_ant ==1)
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t_dec = 1;
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f_dec = 1;
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elseif (num_ant ==2)
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t_dec = 1;
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f_dec = 2;
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elseif (num_ant == 4)
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t_dec = 2;
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f_dec = 4;
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else
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error('Only 1, 2 or 4 antennas supported');
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end
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sig = zeros(num_ant,(num_carriers+prefix_length)*num_symbols_frame);
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sig_f = zeros(num_ant,num_symbols_frame,num_useful_carriers);
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for a=1:num_ant
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for k=(floor((a-1)/2)+1):t_dec:preamble_length
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QAM4_preamble = zeros(1,num_useful_carriers);
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QAM4_preamble(2*mod(a-1,2)+1:f_dec:num_useful_carriers) = QAM_MOD(4,floor(4*abs(rand(1,num_useful_carriers/f_dec))));
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sig(a,(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(a,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(4*abs(rand(1,num_useful_carriers))));
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sig(a,(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(a,k,:) = QAM_data;
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end
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end
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