rx_init_viterbi.m

OFDM相关的维特比算法、BPSK调制等

function rx_init_viterbi

global sim_consts;

global prev_state;
global prev_state_outbits;

prev_state = zeros(64, 2);
prev_state_outbits = zeros(64, 2, 2);

for state = 0:63
   state_bits = de2bi(state, 6);
   input_bit = state_bits(1);
   for transition = 0:1
      prev_state_bits = [state_bits(2:6) transition];
      prev_state(state+1, transition+1) = bi2de(prev_state_bits);
      
      prev_state_outbits(state+1, transition+1, 1) = 2*(rem(sum(sim_consts.ConvCodeGenPoly(1,:).* ...
         [input_bit prev_state_bits]),2)) - 1;
      prev_state_outbits(state+1, transition+1, 2) = 2*(rem(sum(sim_consts.ConvCodeGenPoly(2,:).* ...
         [input_bit prev_state_bits]),2)) - 1;
   end
end