基于MATLAB实现的ieee802.11a物理层OFDM接收机源码+使用说明文档.zip

function [data_bits, raw_bits] = receiver(rx_signal, cir, sim_options); global sim_consts; [n_tx_antennas, n_rx_antennas] = get_n_antennas(sim_options); % Phase noise model if sim_options.UsePhaseNoise phase_noise = phase_noise_model(sim_options.PhaseNoisedBcLevel, ... sim_options.PhaseNoiseCFreq, sim_options.PhaseNoiseFloor, size(rx_signal,2)); rx_signal = rx_signal.*exp(j*repmat(phase_noise, size(rx_signal,1), 1)); end %packet search rx_signal = rx_find_packet_edge(rx_signal, sim_options); % Frequency error estimation and correction rx_signal = rx_frequency_sync(rx_signal, sim_options); % Fine time synchronization fine_time_est = rx_fine_time_sync(rx_signal, sim_options); % Time synchronized signal sync_time_signal = rx_signal(:,fine_time_est + sim_options.RxTimingOffset:length(rx_signal(1,:))); % Return to frequency domain [freq_tr_syms, freq_data_syms, freq_pilot_syms] = rx_timed_to_freqd(sync_time_signal, sim_options); % Channel estimation channel_est = rx_estimate_channel(freq_tr_syms, cir, sim_options); % Phase tracker, returns phase error corrected symbols freq_data_syms = rx_phase_tracker(freq_data_syms, freq_pilot_syms, channel_est, sim_options); % receiver diversity processing [freq_data_syms,freq_pilot_syms] = rx_diversity_proc(freq_data_syms, freq_pilot_syms, ... channel_est, sim_options); % Demodulate soft_bits = rx_demodulate(freq_data_syms, sim_options); % Deinterleave if bits were interleaved if sim_options.InterleaveBits deint_bits = rx_deinterleave(soft_bits, sim_options); else deint_bits = soft_bits; end % hard decision of soft bits, used to measure uncoded BER raw_bits = deint_bits > 0; % depuncture depunc_bits = rx_depuncture(deint_bits, sim_options.ConvCodeRate); % Subcarrier amplitudes are used to weight the soft decisions before Viterbi decoding channel_amps = rx_gen_chan_amps(length(deint_bits), channel_est, sim_options); if sim_options.InterleaveBits channel_amps = rx_deinterleave(channel_amps, sim_options); end channel_amps = rx_depuncture(channel_amps, sim_options.ConvCodeRate); % Weight soft decisions by subcarrier amplitudes viterbi_input = channel_amps(1:(sim_options.PacketLength+6)*2).* ... depunc_bits(1:(sim_options.PacketLength+6)*2); % Vitervi decoding data_bits = rx_viterbi_decode(viterbi_input);