Patent ID: 8275086

Claim:
A frequency synchronization apparatus for detecting a synchronization signal from a plurality of baseband signals, comprising: at least one signal power generator, for receiving a predetermined number of symbols of the baseband signals and respectively calculating an average quality value of the received symbols; a signal selector, connected to the signal power generator, for producing a first detection value according to the average quality value; and a decision unit, connected to the signal selector, including a signal processor for producing a second detection value by using a predetermined mathematical function; wherein the signal processor calculates a third detection value as combining the first detection value and the second detection, and the relation of the detection values are described as: R n =λ·Q n +(1−λ)· P n wherein P n represents the first detection value, Q n represents the second detection value, R n represents the third detection value, and λ represents a value selected from 0, 1, or a fraction number between 0 and 1; whereby, the decision unit decides whether the synchronization signal is received or not in reference with the third detection value.