Patent ID: 8238815
Filing Date: 2012-08-07
Classification: H04B,Y02D

Abstract:
1. A wireless relay device comprising: a first receiving unit receiving a radio signal; a first generating unit generating a coupling loop interference cancellation weight defined as a ratio at which to minimize signal power of a synthesized signal into which a coupling loop interference cancellation signal canceling coupling loop interference getting wrapped around and received by the first receiving unit when transmitting a relay signal to the outside from a single transmitting unit based on the radio signal and generated by changing an amplitude and a phase of the relay signal at a setting-enabled ratio, is cancelled from the reception signal received by the first receiving unit; a first canceling unit outputting a signal into which the signal of the coupling loop interference is cancelled, based on the coupling loop interference cancellation weight generated by the first generating unit, from the signal received by the first receiving unit; a first transmitting unit transmitting the signal as the radio signal, which is output by the first canceling unit; a first switching unit cutting off the transmission of the signal from the first transmitting unit; a second receiving unit receiving the radio signal; a second generating unit generating the coupling loop interference cancellation weight defined as a ratio at which to minimize the signal power of the synthesized signal into which the coupling loop interference cancellation signal canceling the coupling loop interference getting wrapped around and received by the second receiving unit when transmitting the relay signal to the outside from the single transmitting unit based on the radio signal and generated by changing the amplitude and the phase of the relay signal at the setting-enabled ratio, is cancelled from the reception signal received by the second receiving unit; a second canceling unit outputting the signal into which the signal of the coupling loop interference is cancelled, based on the coupling loop interference cancellation weight generated by the second generating unit, from the signal received by the second receiving unit; a second transmitting unit transmitting the signal as the radio signal, which is output by the second canceling unit; and a second switching unit cutting off the transmission of the signal from the second transmitting unit, wherein when the first switching unit cuts off the transmission of the signal from the first transmitting unit, the first generating unit generates a third coupling loop interference cancellation weight for canceling the signal of the coupling loop interference of the radio signal from the second transmitting unit from the reception signal of the first receiving unit, while the second generating unit generates a second coupling loop interference cancellation weight for canceling the signal of the coupling loop interference of the radio signal from the second transmitting unit from the reception signal of the second receiving unit, when the second switching unit cuts off the transmission of the signal from the second transmitting unit, the first generating unit generates a first coupling loop interference cancellation weight for canceling the signal of the coupling loop interference of the radio signal from the first transmitting unit from the reception signal of the first receiving unit, while the second generating unit generates a fourth coupling loop interference cancellation weight for canceling the signal of the coupling loop interference of the radio signal from the first transmitting unit from the reception signal of the second receiving unit, the first canceling unit outputs a signal into which a signal obtained by changing the amplitude and the phase of the transmission signal that should be transmitted by the first transmitting unit at a ratio designated by the first weight and a signal obtained by changing the amplitude and the phase of the transmission signal that should be transmitted by the second transmitting unit at a ratio designated by the third weight, are canceled from the signal received by the first receiving unit, and the second canceling unit outputs a signal into which a signal obtained by changing the amplitude and the phase of the transmission signal that should be transmitted by the first transmitting unit at a ratio designated by the fourth weight and a signal obtained by changing the amplitude and the phase of the transmission signal that should be transmitted by the second transmitting unit at a ratio designated by the second weight, are canceled from the signal received by the second receiving unit.