Patent ID: 8842646

Claim:
A wireless communication apparatus comprising: a signal arrival judgment unit configured to wait until a first time elapses after a MAC frame is transmitted or received, configured to start a signal detection by performing a correlation between a received signal and a known preamble pattern after the first time elapses, and configured to judge whether or not a reception signal is a desired signal after a second time elapses after the first time elapses; a statistic information unit configured to collect statistic information, including a packet error rate, and to compare the statistic information to a predetermined reference value to validate a judgment by the signal arrival judgment unit; a demodulator configured to receive the judgment result by the signal arrival judgment unit, and configured to start to demodulate the reception signal after the signal arrival judgment unit judges that the reception signal arrives is the desired signal; and a transmission and reception frame processor configured to analyze a demodulated MAC frame based on the reception signal.