A radio communication apparatus includes a radio signal processing section which produces a first signal. A power calculation section produces a power value signal of the first signal. A correlation detection section produces correlative value signals corresponding to a correlation between the first signal and a known signal. A first and a second detection section detect a beginning of the reception signal, using the power value signal and the correlative value signal respectively. The first and the second detection section respectively produce a first detection and a second detection signal, each of which include information of a beginning timing of the reception signal. A select control section is supplied with the first and the second detection signals and selectively outputs one of them. A demodulation section demodulates a data signal from the first signal using an output signal from the select control section.

Radio communication apparatus and method of controlling the same

PROBLEM TO BE SOLVED: To facilitate the detection of a synchronizing signal even when the power of a received signal is a little and to enable the detection of the synchronizing signal even when the signal of a noise component only is contained in the received signal and the detection is not easy by comparing the output of a multiplier circuit with the level of a threshold value and discriminating the detection of the synchronizing signal when the output of the multiplier circuit is larger then the threshold value. SOLUTION: A switch 8 outputs the output of a control gain calculating circuit 6 only when receiving a burst detecting signal from a burst detecting circuit 7, and that output is multiplied with the output of a correlative value calculating circuit 3 by a multiplier circuit 9. The output of the multiplier circuit 9 becomes a correlative value not depending on the power of the received signal. A comparative discrimination circuit 10 compares the output of the multiplier circuit 9 with the level of a preset threshold value 11. The threshold value is set so that only the maximum output value of the multiplier circuit 9 can exceed it. When all the synchronizing signal parts of the burst signal are inputted to the correlative value calculating circuit 3, the output of the multiplier circuit 9 gets maximum.

Synchronizing signal detecting device

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Synchronizing signal detecting device