中文说明：维特比代码2维特比代码2维特比代码2维特比代码2维特比代码2维特比代码2维特比代码2维特比代码2维特比代码2维特比代码2
English Description：
Viterbi code 2 Viterbi code 2 Viterbi code 2 Viterbi code 2 Viterbi code 2 Viterbi code 2 Viterbi code 2 Viterbi code 2 hard soft with AWGN channel hard soft with AWGN channel hard soft with AWGN channel hard soft with AWGN channel hard soft with AWGN channel hard soft with AWGN channel hard soft with AWGN