Frame synchronization device, communication terminal apparatus using this device and frame synchronization method

Communication terminal apparatus comprising:

• a receiver configured to receive a communication signal as a received signal that includes a preamble of repeating synchronization symbols, and a data frame following the preamble,
• a first correlation unit configured to correlate between a synchronization symbol and the received signal obtained by the receiver to form a first correlation signal,
• a second correlation unit configured to delay the received signal by a time corresponding to a length of the synchronization symbols to form a delay signal, and correlate between the delay signal and the received signal to form a second correlation signal,
• a preamble detector configured to detect a preamble period based on the second correlation signal to output a period specifying signal,
• a generator configured to detect a start time point of the data frame based on the period specifying signal and the first correlation signal, and to generate a frame synchronize signal at substantially the same time of the detection, and
• a demodulator configured to demodulate the received signal based on the frame synchronize signal.

A frame synchronization method for establishing frame synchronization with a received signal that includes a preamble of repeating synchronization symbols, and a data frame following the preamble, the frame synchronization method comprising:

• correlating between a generated synchronization symbol and the received signal to form a first correlation signal,
• delaying the received signal by a time corresponding to a length of the synchronization symbols to form a delay signal, and correlating between the delay signal and the received signal to form a second correlation signal,
• detecting a preamble period based on the second correlation signal to output a period specifying signal, and
• detecting a start time point of the data frame based on the period specifying signal and the first correlation signal, and generating a frame synchronize signal at substantially the same time of the detection.