This function implememts Soft Output Viterbi Algorithm in trace back mode

Input:

rec_s: scaled received bits. rec_s(k) = 0.5 * L_c(k) * y(k)

L_c = 4 * a * Es/No, reliability value of the channel

y: received bits

g: encoder generator matrix in binary form, g(1,:) for feedback, g(2,:) for feedforward

L_a: a priori information about the info. bits. Extrinsic info. from the previous

component decoder

ind_dec: index of the component decoder.

　　 =1: component decoder 1 The trellis is terminated to all zero state

　　 =2: component decoder 2 The trellis is not perfectly terminated.

Output:

L_all: log ( P(x=1|y) ) / ( P(x=-1|y) )

fr a me size, info. + tail bits-　This function implememts Soft Output Viterbi Algorithm in trace back mode

　Input:

　　　　rec_s: scaled received bits. rec_s(k) = 0.5 * L_c(k) * y(k)

　　　　　　　 L_c = 4 * a * Es/No, reliability value of the channel

　　　　　　　 y: received bits

　　　　g:　encoder generator matrix in binary form, g(1,:) for feedback, g(2,:) for feedforward

　　　　L_a: a priori information about the info. bits. Extrinsic info. from the previous

　　　　　　　component decoder

　　　　ind_dec: index of the component decoder.

　　　　　　　=1: component decoder 1　The trellis is terminated to all zero state

　　 　　　　　　　=2: component decoder 2　The trellis is not perfectly terminated.

　Output:

　　　　L_all: log ( P(x=1|y) ) / ( P(x=-1|y) )

　fr a me size, info. + tail bits