[특허]Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor

Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/30
출원번호	US-0709691 (1991-06-03)
발명자 / 주소	Holland Bruce M. (Boulder CO) Bliss Gary L. (Westminster CO)
출원인 / 주소	SpectraLink Corporation (Boulder CO 02)
인용정보	피인용 횟수 : 105 인용 특허 : 0

초록 ▼

A system and method of driect-sequence spread-spectrum TDMA (or TDD) digital communication, wherein acquisition and tracking occurs for a plurality of frames having a predetermined number of time slots. One of the predetermined number of time slots in each frame is assigned for acquisition purposes and carries acquisition and sync digital information. The remaining time slots in each frame have assigned header bytes for tracking purposes. The assigned acquisition time slot is spread with an acquisition direct-sequence spreading code. The remaining time slots are spread with a communication direct-sequence spreading code. During acquisition, the signal strength in each successive time slot for each spread frame is measured for a given number of time frames. The peak is located within the given number of time frames through a major acquistion sweep and a refinement sweep. The major acquisition sweep and refinement acquisition sweep locate the frame and time slot boundaries of the transmitted signal. Once acquired, tracking occurs during the header bytes of each successive remaining time slot. Acquisition, tracking and demodulation of the digital data is performed with the same circuitry.

대표청구항 ▼

A spread-spectrum communication system for transferring digital information from a transmitter to a receiver, said system comprising: said transmitter comprising: (a) means (40) for providing a plurality of frames of digital data, each frame having a predetermined number of time slots, one of said time slots in each frame being assigned to carry acquisition digital data, the time slots in each frame being assigned to carry communication digital data, each of said time slots having a header field containing tracking digital information, (b) means (10, 20) for generating first and second direct-sequence spreading digital codes having a higher frequency than the frequency of said digital data, (c) means (30, 50) connected to said providing means and to said generating means for spreading said frames of digital data, said acquisition digital data in said one time slot being spread by said first direct-sequence spreading digital code and said communication digital data in said remaining time slots being spread by said second direct-sequence spreading digital code, said receiver having: (a) means (320) for generating said first and second direct-sequence spreading digital codes, (b) means (310, 350) receptive of said spread frames of digital data and connected to said receiver generating means for despreading said spread frames of digital data, (c) means (340, 360, 370) connected to said receiver generating means and to said despreading means for adjusting said generating means until said receiver generated first and second direct-sequence spreading digital codes are in synchronization with said first and second transmitter generated direct-sequence codes used to spread said frames of digital data, said adjusting means acquiring synchronization with said acquisition digital data in said one time slot in each of said spread frames; after acquiring synchronization said adjusting means tracking synchronization with the tracking digital information in each of said remaining time slots in each of said spread frames.

이 특허를 인용한 특허 (105)

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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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Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor 원문보기

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Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor 원문보기

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