Apparatus for frequency synchronization and method for the same

A frequency synchronization apparatus for detecting a frequency correction burst from a plurality of baseband signals, comprising:

• a plurality of signal power generators, each signal power generator receiving a predetermined number of symbols of the baseband signals and respectively calculating an average power value of the received symbols;
• a maximum signal selector, connecting to the signal power generators, for selecting out a maximum average power value from the average power values so as to produce a first detection value;
• and
• a decision unit,
• wherein the decision unit compares the first detection value with a first threshold to determine whether the frequency correction burst is received, and the decision unit further includes a signal processor for using a predetermined mathematical function to produce a second detection value;
• wherein the signal processor compares the second detection value with a second threshold to confirm whether the frequency correction burst is received;
• wherein the signal processor calculates a third detection value by combining the first detection value and the second detection value as described below:
• Rn=λ·Qn+(1−λ)·Pn, wherein Pn is the first detection value, Qn is the second detection value, Rn is the third detection value, and λ is a value between 0 to 1;
• whereby the third detection value is compared with a third threshold to confirm whether the frequency correction burst is received.