jiangx
74552a6f5e
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7395 818b1a75-f10b-46b9-bf7c-635c3b92a50f
60 lines
2.0 KiB
Matlab
60 lines
2.0 KiB
Matlab
%
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% PURPOSE : OFDM Transmitter
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%
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% ARGUMENTS :
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%
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% d_M : modulation order
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% d_N_f : carrier number carrying data
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% d_N_FFT : total carrier number
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% d_N_CP : extented cyclic prefix
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% d_N_OFDM : OFDM symbol number per frame
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% v_active_rf : active RF antenna indicator
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% d_amp : amplitude
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%
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% OUTPUTS :
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%
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% m_sym_T : transmitted signal before IFFT with dimension d_N_f x d_N_OFDM x d_N_ant_act
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% m_sig_T : OFDM signal with dimension ((d_N_FFT+d_N_CP)*d_N_OFDM) x d_N_ant
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%
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%**********************************************************************************************
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% EURECOM - All rights reserved
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%
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% AUTHOR : Xiwen JIANG, Florian Kaltenberger
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% DEVELOPMENT HISTORY :
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%
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% Date Name(s) Version Description
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% ----------- ------------- ------- ------------------------------------------------------
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% Apr-29-2014 X. JIANG 0.1 creation of code
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%
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% REFERENCES/NOTES/COMMENTS :
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%
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% - Based on the function "genrandpskseq" created by Mirsad Cirkic, Florian Kaltenberger.
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%
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%**********************************************************************************************
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function [m_sym_T, m_sig_T] = f_ofdm_tx(d_M, d_N_f, d_N_FFT, d_N_CP, d_N_OFDM, v_active_rf, d_amp)
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d_N_ant_act = sum(v_active_rf);
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%** constellation table **
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v_MPSK = exp(sqrt(-1)*([1:d_M]*2*pi/d_M+pi/d_M));
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%** transmitted symbol **
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%v_state = [1;2;3;4];
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%rand("state",v_state);
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m_sym_T = v_MPSK(ceil(rand(d_N_f, d_N_OFDM, d_N_ant_act)*d_M));
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%** mapping useful data to favorable carriers **
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m_sym_T_ext = zeros(d_N_FFT,d_N_OFDM,d_N_ant_act);
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m_sym_T_ext(2:151,:,:) = m_sym_T(151:300,:,:);
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m_sym_T_ext(363:512,:,:) = m_sym_T(1:150,:,:);
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%** ifft **
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m_sig_T_ = sqrt(d_N_FFT)*ifft(m_sym_T_ext,d_N_FFT,1);
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%** add cyclic prefix **
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m_sig_T_ = [m_sig_T_(end-d_N_CP+1:end,:,:); m_sig_T_];
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d_L = (d_N_FFT+d_N_CP)*d_N_OFDM;
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m_sig_T = floor(reshape(m_sig_T_,d_L,d_N_ant_act)*d_amp);
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end
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