SPECIFICATION METHOD FOR RECEPTION CHANNEL USING PATH METRIC VALUE CALCULATION AND ITS SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a specification system for a reception channel using a path metric value calculation free from fluctuation where a time required to specify a correct reception channel is short. SOLUTION: The system for specifying a reception channel is provided with a 1st means that calculates a path metric value of each status in Viterbi decoding up to the number of 1st prescribed bits as to a generation polynomial in convolution coding corresponding to each channel on the basis of an input signal of an unknown reception channel and with a 2nd means that specifies a reception channel of an input signal on the basis of a difference between a maximum value and a minimum value of the path metric values. The 2nd means is provided with a means that obtains a calculated value on the basis of the difference up to prescribed bits, a means that compares the calculated value with the prescribed 1st threshold, and a means that specifies a channel at that time for the reception channel when the calculated value is higher than the prescribed 1st threshold.