[특허]Spread spectrum communications system

Spread spectrum communications system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/30
출원번호	US-0589323 (1990-09-27)
발명자 / 주소	Partyka Andrzej (Bedminster NY) Crowley Lee F. (Farmingville NY)
출원인 / 주소	Pittway Corporation (Syosset NY 02)
인용정보	피인용 횟수 : 119 인용 특허 : 0

초록 ▼

A spread spectrum communication system for direct sequence transmission of digital information having a modulation format which is particularly suitable for indoor communication within residential, office and industrial structures. The modulation format combines BPSK or MSK spreading with FM carrier modulation by data bits and a carrier frequency shift whose magnitude is related to both a chip rate and a spreading sequence length. The carrier, chip clock and data clock are all synchronous and the sequence length is an integral submultiple of the bit length. The system reduces the frequency error between the transmitter chip clock and the receiver chip clock to permit the elimination of a code phase tracking loop in the receiver to reduce the receiver complexity. The receiver has an extended dynamic range which makes possible the reception of very strong signal without an automatic gain control loop (AGC) as well as reducing the time needed for code phase acquisition. The transmission system is highly resistant to CW jamming and short distance multipath effects.

대표청구항 ▼

A system for transmitting and receiving digital data, comprising: a) means for generating a high frequency carrier at a first carrier frequency; b) means for modulating the frequency of said carrier with data bits assembled in data packets of predetermined format; c) means for shifting the nominal frequency of said carrier by a frequency increment DF to obtain a second carrier frequency, where DF=K*1/Ts+dF, dF=approximately L/(2*Ts), K is an integer, L is an odd integer, and Ts is a PN (pseudo noise) sequence period; d) means for spreading said carrier at said first and said second frequency, during a transmission time, by a predetermined PN sequence having a period Ts related to a bit time Tb where Tb=N * Ts, N being an integer >1 whereby a spread carrier spectrum comprising many spectral components separated by 1/Ts is obtained, the amplitudes of said components being reduced by said spreading function, e) means for receiving the transmitted data; and f) means for multiplying said transmitted spread carrier in said receiver means by a locally generated predetermined PN sequence, for collapsing the bandwidth of the received spread carrier when the local PN sequence phase in agreement with the sequence phase imposed on the received spread carrier.

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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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연합인증

Spread spectrum communications system 원문보기

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Spread spectrum communications system 원문보기

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