[특허]Serial search acquisition system with adaptive threshold and optimal decision for spread spectrum systems

Serial search acquisition system with adaptive threshold and optimal decision for spread spectrum systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-015/00 H04K-001/00 H04L-027/30
출원번호	US-0506336 (1995-07-25)
발명자 / 주소	Chung Sanguoon (San Diego CA) Noneman John W. (Valley Center CA)
출원인 / 주소	Nokia Mobile Phones, Ltd. (Salo FIX 03)
인용정보	피인용 횟수 : 126 인용 특허 : 0

초록 ▼

A PN code acquisition system for Code Division Multiple Access (CDMA) Direct Sequence Spread Spectrum (DSSS) systems, with automatic decision threshold, is based on the combination of the Maximum Likelihood (ML) and Serial Search (SS) acquisition approaches. In contrast to the conventional SS acquisition system, the disclosed system adaptively estimates optimal threshold by exploiting the statistics of the signal and noise, and makes an optimal decision based on the threshold. The system estimates the threshold by employing ML estimation and applies the threshold as in SS acquisition and makes a decision by comparing the updated threshold with the current signal strength. Together with post detection verification logic, this approach will increase detection probability and reduce false alarm probability significantly. An optimum system parameter design approach and the advantages of this approach as compared to conventional approaches (ML or SS acquisition) are demonstrated.

대표청구항 ▼

A method for PN code acquisition in a PN code signal transmitted in a Code Division Multiple Access (CDMA) Direct Sequence Spread Spectrum (DSSS) system, comprising the steps of: receiving a transmitted PN code signal and multiplying said signal with a PN code replica signal to produce an input signal for use in determining the phase alignment of said PN code signals; integrating the signal energy of said input signal over a time interval to obtain a first result; establishing a noise estimate; establishing a signal detection threshold having a value greater than that of said noise estimate; establishing a signal classification threshold, having a value between that of said signal detection threshold and said noise estimate; establishing a first number CN of PN phases i to be searched and a total number q of PN phases for said PN code replica signal; maintaining a count cn of said PN phases i; and searching for said alignment by detecting the signal energy levels and the noise levels of said input signal by the steps of: evaluating whether said first result is equal to or exceeds the value of said signal detection threshold; if NO, evaluating whether said first result exceeds the value of said signal classification threshold; and if NO, updating the value of said noise estimate with the value of said first result and updating said count cn by 1, and determining whether said updated count is equal to or exceeds CN; if YES, ending the search; if NO, determining whether the PN phase i of said PN code replica signal equals q; if YES, ending the search; if NO, updating the PN phase i of said PN code replica signal by 1, and continuing the search by repeating the foregoing steps using the phase updated PN code replica signal to multiply said transmitted PN code signal; if YES, resetting said count cn to 0, and determining whether the PN phase i of said PN code replica equals q; if YES, ending the search; if NO, updating the PN phase i of said PN code replica signal by 1, and continuing the search by repeating the foregoing steps using the phase updated PN code replica signal to multiply said transmitted PN code signal.

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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)
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Serial search acquisition system with adaptive threshold and optimal decision for spread spectrum systems 원문보기

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Serial search acquisition system with adaptive threshold and optimal decision for spread spectrum systems 원문보기

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