www.gusucode.com > 基于VBLAST-OFDM的MATLAB SIMULATION,图形化界面,并且给出了各仿真图 > 基于VBLAST-OFDM的MATLAB SIMULATION,图形化界面,并且给出了各仿真图/vblast-ofdm simulation/rx_convert_to_freq_vblast.m
function [freq_tr_syms, freq_data_syms] = rx_convert_to_freq_vblast(time_signal, SimulationParameters) global SimulationConstants; M=SimulationParameters.M; [n_tx_antennas, n_rx_antennas] = get_n_antennas(SimulationParameters); fft_length=SimulationParameters.FFTPoints; %long training symbols for rx_ant = 1:n_rx_antennas long_tr_syms = [time_signal(rx_ant,1:fft_length) time_signal(rx_ant,fft_length+17:2*fft_length+16)]; long_tr_syms = reshape(long_tr_syms, fft_length, 2); % to frequency domain freq_long_tr = fft(long_tr_syms)/sqrt(n_tx_antennas); reorder = [(fft_length/2)+1:fft_length 1:(fft_length/2)]; freq_long_tr(reorder,:) = freq_long_tr; % Select training carriers freq_tr_syms = freq_long_tr; %if there is a zeropad option if SimulationParameters.ZeroPad==1 num_data_carriers=SimulationConstants.NumDataSubc; x=fft_length-num_data_carriers; freq_tr_syms=freq_tr_syms([x/2:x/2+num_data_carriers/2-1 ((x/2+num_data_carriers/2)+1):fft_length-(fft_length-num_data_carriers)/2],:); end data_syms = time_signal(rx_ant, (2*fft_length)+1:length(time_signal)); data_sig_len = length(data_syms); n_data_syms = floor(data_sig_len/(fft_length+16)); % Cut to multiple of symbol period data_syms = data_syms(1:n_data_syms*(fft_length+16)); data_syms = reshape(data_syms, (fft_length+16), n_data_syms); % remove guard intervals data_syms(1:16,:) = []; % perform fft freq_data = fft(data_syms)/sqrt(n_tx_antennas); %Reorder pattern is [33:fft_length 1:32] freq_data(reorder,:) = freq_data; %Select data carriers freq_data_syms = freq_data; %if there is a zeropad option if SimulationParameters.ZeroPad==1 num_data_carriers=SimulationConstants.NumDataSubc; x=fft_length-num_data_carriers; freq_data=freq_data([x/2:x/2+num_data_carriers/2-1 ((x/2+num_data_carriers/2)+1):fft_length-(fft_length-num_data_carriers)/2],:); end tmp_freq_tr(rx_ant,:,:) = freq_tr_syms; tmp_data_syms(rx_ant,:,:) = freq_data; end freq_tr_syms = tmp_freq_tr; freq_data_syms = tmp_data_syms;