Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1992-02-24
1995-04-25
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455307, 455311, 375200, 375349, H04B 110
Patent
active
054107504
ABSTRACT:
The RF input of a radio receiver is converted to IF including received signal, noise and interference and fed to an interference detector and to an interference canceler of an interference suppressor. A fast Fourier transform (FFT) at the front end of the interference detector detects samples of all the interferences in the frequency domain. The frequency domain samples are scaled for gain control and detection of interferences above a predetermined threshold. The interference detector suppresses interferences to the predetermined threshold level. The scaled frequency domain interference samples are phase rotated and fed to an inverse fast Fourier transform to obtain a time domain replica of the interferences which are phase shifted replicas of the detected interferences. Such digital time domain replicas are converted to a continuous analog replica of the interferences, converted back to IF and summed with the original IF which included received signals, noise and interferences in order to cancel the interferences at the output of the interference suppressor.
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patent: 4613978 (1986-09-01), Kurth et al.
patent: 4673982 (1987-06-01), Tam et al.
patent: 4972430 (1990-11-01), Cantwell
"Linear Circuits" Part 2, Frequency-Domain Analysis, Ronald E. Scott, Addison-Wesley Publishing Company, Inc., Reading, Mass., 1960, pp. 516-522.
"GPS Signal Structure and Performance Characteristics," J. J. Spilker, Jr., The Institute of Navigation, Global Positioning Papers, published in Navigation, vol. 2, pp. 29-54.
Cantwell Robert H.
Matthews James B.
Dawson Walter F.
Raytheon Company
Urban Edward F.
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