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

global sim_consts;

% Return to frequency domain
% 返回到頻域
[freq_tr_syms, freq_data_syms, freq_pilot_syms] = rx_timed_to_freqd(rx_signal(193:end), sim_options);

freq_tr_syms=freq_tr_syms/sqrt(64);
freq_data_syms=freq_data_syms/sqrt(64);
freq_pilot_syms=freq_pilot_syms/sqrt(64);

% Demodulate
% 解調(diào)
[pr, soft_bits] = rx_demodulate(freq_data_syms, sim_options, SNR);

% hard decision of soft bits, used to measure uncoded BER
% 軟位流的硬判決，用于測量非編碼的誤碼率
raw_bits = soft_bits > 0;

% LDPC decoding
% LDPC譯碼
data_bits = rx_ldpc_decode(pr, sim_options.DecMaxIter);