[특허]Scanning method for receiving a transmission in a communication system with slow frequency hopping and coding

Scanning method for receiving a transmission in a communication system with slow frequency hopping and coding 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/713
출원번호	US-0997880 (1992-12-29)
발명자 / 주소	Altmaier Paulette R. (Cupertino CA) Potrebic Peter J. (Mountain View CA)
출원인 / 주소	Apple Computer, Inc. (Cupertino CA 02)
인용정보	피인용 횟수 : 34 인용 특허 : 0

초록 ▼

A scanning method for receiving a signal in a frequency hopped communication system that transmits a packet having N segments that are encoded with an error correction code that allows recovery of a packet even if e segments are erasures. A receiving station continuously scans the first p (1≤p≤e+1) channels, testing each channel for the existence of a transmission. If detected, a segment is received, and then the receiving station sequences through the remaining channels, receiving the segments if possible, and then applying error correction to the complete transmission. This technique of scanning the first several channels, receiving the first unimpaired segment, and thereby gaining the ability to recover all unimpaired segments enables the full theoretical power of a coded, slow frequency hopped system to be realized.

대표청구항 ▼

In a decentralized communication system for communicating between two or more of a plurality of unsynchronized stations, a method for detecting and receiving a packet of data transmitted by an arbitrary transmitting station of said plurality of stations using frequency hopping in a predetermined channel sequence of N radio frequencies including a first p (pN) frequencies, in which said transmitting station encodes and arranges the packet into a plurality of N segments including a first p (pN) segments each having a corresponding preamble time length t1, comprising the steps of: (a) in an arbitrary receiving station that is unsynchronized with said transmitting station, scanning and testing said first p frequencies in a second time period t2 that is less than the preamble time length t1; (b) if a transmission is detected on a first one of said p frequencies, then performing a receiving step (c), otherwise returning to step (a); and (c) if a transmission is detected in the step (a), receiving the segment associated with said first one of said p frequencies, hopping to the next frequency in the predetermined channel sequence and receiving a segment on that channel, and continuing to hop and receive until the Nth segment has been received.

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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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Scanning method for receiving a transmission in a communication system with slow frequency hopping and coding 원문보기

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Scanning method for receiving a transmission in a communication system with slow frequency hopping and coding 원문보기

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