[특허]Double dwell maximum likelihood acquisition system with continuous decision making for CDMA and direct spread spectrum s

Double dwell maximum likelihood acquisition system with continuous decision making for CDMA and direct spread spectrum s 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/69 H04J-013/02 H04J-013/04
출원번호	US-0157376 (1993-11-23)
발명자 / 주소	Chung Sunguoon (San Diego CA) Czaja Stash (Cardiff CA)
출원인 / 주소	Nokia Mobile Phones Ltd. (Salo FIX 03)
인용정보	피인용 횟수 : 101 인용 특허 : 0

초록 ▼

A double dwell, maximum likelihood, serial sliding acquisition system (10) employs two thresholds which are a function of maximum likelihood thresholds, and not predetermined optimal thresholds. The two thresholds have values that are signal dependent, and are obtained in real time from a correlation of a received PN signal and a locally generated PN sequence during the acquisition process. The acquisition system continuously monitors the reliability of the detected signal. As a result, the decision making process is continuously performed so as to terminate the acquisition process whenever the detected signal is determined to be reliable. The acquisition system employs a principle that an optimal threshold level, in the power domain, is 6 dB lower than that of the maximum likelihood signal. The acquisition system obtains the maximum signal power from a maximum likelihood detector portion to adaptively update a threshold estimate, and then uses the adaptive threshold estimate for monitoring the reliability of the detected signal. After the reliable signal is detected the search process continues for an additional interval of time which is a function of a false alarm probability. The limited interval for which the search process continues is preferably a fraction or multiple of the second, longer dwell time. This additional searching interval is referred to as a post-detection search interval. During the post-detection search interval, the acquisition system monitors the received signal samples and, when no additional signal is detected, the acquisition process is terminated.

대표청구항 ▼

A method of searching a pseudorandom noise (PN) code space, comprising the steps of: (a) combining a received PN code signal with a first local PN code signal to obtain an input signal; (b) integrating the signal energy of the input signal over a first predetermined time interval to obtain a first result; (c) comparing the first result to a first threshold having a value that is a function of a previous first result; if the first result is determined to be less than the first threshold, changing the local PN code, and repeating steps (a) through (c); else if the first result is determined to be equal to or greater than the first threshold, setting the first threshold equal to the first result; and (d) integrating the signal energy of the input signal over a second predetermined time interval to obtain a second result, wherein the second predetermined time interval has a duration that exceeds the first predetermined time interval; (e) comparing the second result to a second threshold having a value that is a function of a previous second result; if the second result is determined to be less than the second threshold, changing the local PN code, and repeating steps (a) through (c); else if the second result is determined to be equal to or greater than the second threshold, setting the second threshold equal to the second result; and (f) if the end of the PN code space has not been reached, repeating steps (a) through (c).

이 특허를 인용한 특허 (101)

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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

Double dwell maximum likelihood acquisition system with continuous decision making for CDMA and direct spread spectrum s 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (101)

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연합인증

Double dwell maximum likelihood acquisition system with continuous decision making for CDMA and direct spread spectrum s 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (101)

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