receiver.m

来自「OFDM系统的仿真代码MATLAB环境下」· M 代码 · 共 52 行

function [data_bits, raw_bits] = receiver(rx_signal,tx_raw_inf_bits);

global sim_consts;

[n_tx_antennas, n_rx_antennas] = get_n_antennas;

if n_rx_antennas == 2
    
else

   %sum the signal from different antennas
   rx_signal = sum(rx_signal,1);
    
   % Return to frequency domain
   [freq_data_syms, freq_pilot_syms] = rx_timed_to_freqd(rx_signal,n_tx_antennas);
   
   % Channel Estimation 
   cir = channel_estimation(freq_pilot_syms);
   
   % Get the modulated frequency signal
   mod_freq_data_syms = freq_data_syms./cir;
   
   % Demodulate
   soft_bits = rx_demodulate(mod_freq_data_syms);

   % Deinterleave if bits were interleaved
   if sim_consts.InterleaveBits == 1
      deint_bits = rx_deinterleave(soft_bits);
   else
      deint_bits = soft_bits;
   end

   % hard decision of soft bits, used to measure uncoded BER
   n = length(deint_bits);
   for index = 1:n
       if deint_bits(index) > 0
           raw_bits(index) = 1;
       elseif deint_bits(index) <= 0 
           raw_bits(index) = 0;
       end
   end 
   raw_bits(:,length(tx_raw_inf_bits)+1:end) = [];
 
   % depuncture
   % depunc_bits = rx_depuncture(raw_bits, sim_consts.ConvCodeRate);

   % Vitervi decoding
   data_bits = rx_viterbi_decode(raw_bits);
end