PURPOSE: To save the energy consumption of a mobile station to be caused by the transmission of demodulation signals from the mobile station by modulating an antenna reflection coefficient of the mobile station, and actively reflection modulating and transmitting carrier waves.
CONSTITUTION: In the direction of a leader (fixed station) 2 and budge (mobile station) 1 (an inquiry by the leader 2), the leader 2 works to modulate oscillation modulation microwaves. At this time, a modem (modulator and demodulator) 3 of the budge 1 operated as a demodulator operates to restore the envelope of a signal from the leader 2 and, if required, it is amplified and sent to an information process circuit 4. Also, in the direction of the budge 1 and leader 2 (a response by the badge 1), non-demodulation microwaves or carrier is still sent by the leader 2. The modulation carrier is reflected toward the leader 2. The modem 3 acts as a demodulator, and by variations of the conformity of an antenna 9, the carrier is demodulated. Signals indicating conformity or nonconformity are sent by an information circuit 4 activated by a fore-alignment signal.
BURONIIKU SERIYU
DOMINIKU JIEFUROWA
