Patent ID: 11870489
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The SN ratio estimation circuit according to claim 1,
wherein the updating unit includes:
an average power calculation unit that calculates an average power value of the tentative decision signal output by the tentative decision unit;
a decision unit that decides whether or not the degree of agreement between the appearance frequencies is within the predetermined permissible range on the basis of a target power value calculated from the appearance frequency of each symbol in the reference signal and the average power value, and outputs the instruction signal to the SN ratio calculation unit when it is decided that the degree of agreement is within the permissible range; and
an update computation unit that updates the scale value or updates the threshold change rate on the basis of the target power value and the average power value when the decision unit decides that the degree of agreement is not within the permissible range.