| 摘要 |
PURPOSE:To eliminate an interference wave effectively due to the transmitted wave of own station, by controlling at least one of the amplitude and phase at an equalizer in response to the output of a frame error detector. CONSTITUTION:The amplitude and the phase of a signal 14 obtained by branching a transmission signal of a transmitter 1 at a coupler 2 are controlled at the equalizer 3 comprising an amplitude adjusting device 8 and a phase adjusting device 9. Further, a receiving signal 17 received on a receiving antenna 11 and selected at an antenna filter 16 and an output of the equalizer 3 are synthesized by a synthesizer 4. This synthesized signal 18 is demodulated at a demodulator 5 and the detection of the frame error rate as to a demodulating signal is done at a frame error detector 6. The result of the measurement is applied to a controller 7, which controls the amplitude adjusting device 8 and the phase adjusting device 9 of the equalizer 3 with an amplitude adjusting signal 21 and a phase adjusting signal 22 of the controller so as to minimize the frame error rate. |
