hunter555persia
Member level 2
In modulation schemes other than BPSK each symbol contains more than one bit. Now in soft-decision Viterbi algorithm the Euclidean distances (metrics) between the received symbol and all possible symbols are calculated. But since each symbol represents a few bits (the number of bits is not necessarily equal to the number of bits on each trellis branch) , the calculated metrics cannot be the branch metrics of one trellis step. So I can't figure out how to find branch metrics and consequently I can't calculate path metrics and can't do the trace back.
How is the soft-decision Viterbi done in a M-ary modulated system ???
Thanks for any reply.
How is the soft-decision Viterbi done in a M-ary modulated system ???
Thanks for any reply.