Frame synchronization method, processor, and communication apparatus

A frame synchronization method comprising:

• comparing a first reference signal arranged at a predetermined position in a received signal with a first known signal pattern;
• calculating a maximum value of a first cross correlation value;
• estimating a C/N ratio of the received signal, using the maximum value of the first cross correlation value 2;
• setting a correlation threshold for detecting a frame synchronization according to the estimated C/N ratio;
• comparing a second reference signal for a frame synchronization with a second known signal pattern, the second reference signal being arranged at a predetermined position in the received signal;
• calculating a second cross correlation value according to the comparison of the second reference signal with the second known signal pattern;
• and
• detecting timing at which the second cross correlation value first exceeds the correlation threshold as a frame synchronization point.