Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1986-10-21
1988-04-05
Masinick, Michael A.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455139, 455272, 455273, 455276, 455278, H04N 106
Patent
active
047364556
ABSTRACT:
An interference cancellation system at a receiver side for digital radio system has a first quadrature phase detector for demodulating the main signal. A second quadrature phase detector (or a phase detector) is supplied with the same reference carrier and clock signal as that of the first quadrature phase detector, for phase detecting an interference signal. A decision circuit is coupled with the first quadrature phase detector to provide a baseband signal. An error signal detector provides a difference between a decision level of a digital signal and an input of the decision circuit due to the interference signal. A correlation device provides a correlation signal between an error signal and a phase detected interference signal. A control device 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. A combiner and a control means may be inserted either in an RF stage or an IF stage, or in a baseband stage. An error signal detector and decision circuit are implemented by an A/D converter. A correlation means is implemented by a digital or analog multiplier and integrators.
REFERENCES:
patent: 4373210 (1983-02-01), Karabinis et al.
patent: 4384366 (1983-05-01), Kaitsuka
patent: 4498885 (1985-02-01), Namiki
patent: 4584712 (1986-04-01), Isobe et al.
Matsue Hideaki
Murase Takehiro
Masinick Michael A.
Nippon Telegraph and Telephone Corporation
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