Frame synchronization apparatus and its control method

A control method to be adopted by a frame synchronization apparatus for controlling a frame synchronization process carried out on an input signal, said control method comprising the steps of:

• computing a correlation value representing a correlation between a known delay wave detection series composed of a symbol array of known values inserted into said input signal and a received delay wave detection series composed of a symbol array obtained as a result of a signal detection process carried out on said input signal;
• selecting a larger one of absolute values representing amplitudes of I and Q components representing respectively real and imaginary parts of said correlation value computed at said correlation-value computation step;
• and
• carrying out a peak detection process to detect a peak in pieces of data arranged along a time axis to form a correlation-value series composed of said absolute values each selected at said IQ component select step as the amplitude of said I or Q component and outputting a frame synchronization signal for said input signal in accordance with a result of said peak detection process.

A frame synchronization apparatus for controlling a frame synchronization process carried out on an input signal, said frame synchronization apparatus comprising:

• correlation-value computation means for computing a correlation value representing a correlation between a known delay wave detection series composed of a symbol array of known values inserted into said input signal and a received delay wave detection series composed of a symbol array obtained as a result of a signal detection process carried out on said input signal;
• IQ component select means for selecting a larger one of absolute values representing amplitudes of I and Q components representing respectively real and imaginary parts of said correlation value computed by said correlation-value computation section;
• and
• synchronization-signal outputting means for carrying out a peak detection process to detect a peak in pieces of data arranged along a time axis to form a correlation-value series composed of said absolute values each selected by said IQ component select section as the amplitude of said I or Q component and outputting a frame synchronization signal for said input signal in accordance with a result of said peak detection process.