[특허]Interference suppressor for a radio receiver

Interference suppressor for a radio receiver 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/10
출원번호	US-0840252 (1992-02-24)
발명자 / 주소	Cantwell Robert H. (Sudbury MA) Matthews James B. (Wayland MA)
출원인 / 주소	Raytheon Company (Lexington MA 02)
인용정보	피인용 횟수 : 84 인용 특허 : 0

초록 ▼

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.

대표청구항 ▼

An interference suppressor comprising: means coupled to an IF signal which comprises interference signals for suppressing said interference signals, said suppressing means comprises means for down converting said IF signal including interference signals to baseband sampled signals; means coupled to said down converting means for converting said baseband sampled signals from a time domain to a frequency domain; means coupled to said time domain to frequency domain converting means for excising said interference signals in said frequency domain; said excising means comprises a filter controller means coupled to said time domain to frequency domain converting means for generating delays for said frequency domain interference sampled signals to allow for continuous inputs and outputs of said suppressing means; a cell magnitude detector means coupled to said delayed interference sampled signals from said filter controller means for detecting an adjacent and main cell magnitude of said interference sampled signals at a sampling frequency rate; phase selector means coupled to said cell magnitude detector means for determining a phase rotation angle (fK) of each of said frequency domain interference sampled signals; phase rotator means coupled to said phase selector means and said filter controller means for providing said phase rotation angle (fK) to each of said frequency domain interference sampled signals; and a frequency domain amplitude selector means coupled to said phase rotator means for denormalizing said phase rotated frequency domain interference sampled signals to generate frequency domain interference amplitude estimates in accordance with a frequency domain scale factor signal; means coupled to said excising means for converting said excised interference signals from said frequency domain to said time domain; means coupled to said frequency to time domain converting means for up converting said excised interference signals from baseband sampled signals to intermediate frequency; and means for combining said interference signals with said IF signal which comprises interference signals to cancel said interference signals.

이 특허를 인용한 특허 (84)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Interference suppressor for a radio receiver 원문보기

초록 ▼

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Interference suppressor for a radio receiver 원문보기

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대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (84)

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