function [pr, soft_bits] = rx_demodulate(rx_symbols, sim_options, SNR)

rx_symbols=rx_symbols(:).';

% We make 'soft' bit estimation for viterbi.
if ~isempty(findstr(sim_options.Modulation, 'BPSK'))
	[pr, soft_bits] = rx_bpsk_demod(rx_symbols, SNR);
elseif ~isempty(findstr(sim_options.Modulation, 'QPSK'))
   [pr, soft_bits] = rx_qpsk_demod(rx_symbols, SNR);
else
   error('Undefined modulation');
end