WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION APPARATUS, RADAR DETECTION CIRCUIT, AND RADAR DETECTION METHOD USED THEREFOR

PROBLEM TO BE SOLVED: To provide a radar detection circuit detecting a radar at all times almost without degrading a communication efficiency. SOLUTION: A radar threshold value comparison circuit 141 compares a radar threshold value a or (a) radar threshold value (b) from a radar threshold value (a) latch circuit 142 or a radar threshold value (b) latch circuit 143 selected by a radar selector 144 receiving a radar threshold value selection signal from a reception control circuit 13 with an output of a power calculation / moving average circuit 12. A radar time circuit 145 discriminates whether a radar timer operation is to be started on the basis of an output from the radar threshold value comparison circuit 141 and a radar timer start enable signal from the reception control circuit 13. A radar detection discrimination circuit 146 discriminates the presence / absence of radar detection depending on the output of the radar threshold value comparison circuit 141 and a state of the radar timer circuit 145, and outputs a radar detection high-order notice signal to a high-order layer of the communication protocol at the discrimination of radar detection. COPYRIGHT: (C)2006,JPO&NCIPI