jiangx
20d52e1953
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5910 818b1a75-f10b-46b9-bf7c-635c3b92a50f
47 lines
1.7 KiB
Matlab
47 lines
1.7 KiB
Matlab
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% PURPOSE : channel estimation using least square method
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% ARGUMENTS :
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% m_sym_T : transmitted symbol, d_N_f x d_N_ofdm x d_N_ant_act x d_N_meas
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% m_sym_R : received symbol, d_N_f x d_N_ofdm x d_N_ant_act x d_N_meas
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% d_N_meas : number of measurements
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% OUTPUTS :
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% m_H_est : estimation of sub-channels, d_N_antR x d_N_antT x d_N_f x d_N_meas
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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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% 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 "runmeas_full_duplex" created by Mirsad Cirkic, Florian Kaltenberger.
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%
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%**********************************************************************************************
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function m_H_est = f_ch_est(m_sym_T, m_sym_R)
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%% ** initialisation **
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[d_N_f,d_N_OFDM,d_N_antT,d_N_meas] = size(m_sym_T);
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d_N_antR = size(m_sym_R,3);
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m_H_est = zeros(d_N_antR,d_N_antT,d_N_f,d_N_meas);
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%% ** estimate the subband channel for each measurement and antenna **
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for d_n_meas = 1:d_N_meas
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for d_n_f = 1:d_N_f
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m_y = reshape(m_sym_R(d_n_f,:,:,d_n_meas),d_N_OFDM,d_N_antR).'; % squeeze: problem for antenna number = 1 case
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m_s = reshape(m_sym_T(d_n_f,:,:,d_n_meas),d_N_OFDM,d_N_antT).';
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m_H_est(:,:,d_n_f,d_n_meas) = m_y*m_s'/(m_s*m_s'); % LS channel estimation
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end
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end
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end
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