[특허]Digital communications equipment using differential quaternary frequency shift keying

Digital communications equipment using differential quaternary frequency shift keying 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04K-001/00
출원번호	US-0136749 (1993-10-15)
발명자 / 주소	Sutton Jeff R. (San Jose CA) Grau Jr. Juan G. (San Mateo CA)
출원인 / 주소	Proxim Incorporated (Mountain View CA 02)
인용정보	피인용 횟수 : 117 인용 특허 : 0

초록 ▼

A digital radio transceiver uses a differential 4-ary frequency shift keying (D4FSK) modulation scheme to achieve a radio that is low cost, miniaturizable, low in power consumption, and high in spectral efficiency. An adaptive digital “slicer”looks at a digitized FM video signal produced in the receiver to determine if the data sent is a 00, 01, 10 or 11. The digitized FM video signal is first processed by a differential decoder, the output of which is input to a peak detector. The peak detector outputs a signal upon the occurrence of a three-step transition, i.e., a peak-to-peak voltage value. Two-step and three-step transitions are separately detected and used to perform digital clock recovery. A carrier detect circuit uses a digital bit filter to produce a carrier detect signal that is reliable and glitch-free. The digital radio transceiver uses frequency hopping spread spectrum transmission. A switchable loop bandwidth frequency synthesizer provides for glitch-free switching between a wide hopping bandwidth and a narrow bandwidth between hops.

대표청구항 ▼

A communications transmitter for transmitting a digital bit stream, comprising: means for converting said digital bit stream to a stream of multi-bit symbols; means for differentially encoding said stream of multi-bit symbols to produce a stream of differentially encoded symbols; and means for frequency modulating a carrier signal in accordance with said differentially encoded symbols so as to represent each differentially encoded symbol by one of a plurality of frequencies related in number to a number of bits in said multi-bits symbols.

이 특허를 인용한 특허 (117)

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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

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
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Digital communications equipment using differential quaternary frequency shift keying 원문보기

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Digital communications equipment using differential quaternary frequency shift keying 원문보기

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