H - Electricity – 04 – K
Patent
H - Electricity
04
K
325/120, 325/72
H04K 3/00 (2006.01) H04B 1/10 (2006.01) H04B 1/12 (2006.01) H04B 7/08 (2006.01)
Patent
CA 1257658
TITLE OF THE INVENTION An Interference Cancellation System ABSTRACT OF THE DISCLOSURE An interference cancellation system at a receiver for a digital radio system has a first quadrature phase detector for demodulating a main signal, and a second quadrature phase detector (or a phase detector) which is supplied the same reference carrier and clock signal as that of the first quadrature chase detector, for phase detecting an interference signal. A decision circuit is coupled with the first quadrature phase detector to provide a baseband signal, and an error signal detector provides the difference between a digital signal decision level and the input of the decision circuit due to the interference signal. A correlation means provides a correction signal between the error signal and the phase detected interference signal, and a control means provides a compensation signal which has the same amplitude and anti-phase as those of the interference component included in the main signal according to the correlation signal. A combiner combines the main signal with the compensation signal to provide a compensated main signal which is free from interference. The combiner and the control means may be inserted in an RF stage, an IF stage, or in a baseband stage. The error signal detector and decision circuit may be implemented by an A/D converter, and the correlation means may be implemented by a digital or analog multiplier and an integrator.
521944
Matsue Hideaki
Murase Takehiro
Borden Ladner Gervais Llp
Nippon Telegraph And Telephone Corporation
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