[특허]Sliding correlator

Sliding correlator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-007/00
출원번호	US-0556439 (1995-11-09)
우선권정보	JP-0331059 (1992-11-17)
발명자 / 주소	Kurihara Takao (Kohriyama JPX) Uchida Yoshitaka (Kohriyama JPX) Hamatsu Masahiro (Kohriyama JPX)
출원인 / 주소	Clarion Co., Ltd. (Tokyo JPX 03)
인용정보	피인용 횟수 : 54 인용 특허 : 0

초록 ▼

A sliding correlator for initial synchronization and tracking of a SS (Spread Spectrum)-modulated signal containing a transmitted pseudo noise (PN) code, digitizes the received signal, and attempts to correlate the PN code in the received signal with a locally generated reference PN code. Initial synchronization employs correlation with three reference PN codes, an early, center and late channel. When correlation is found between the transmitted PN code and one of the reference PN codes, the three reference PN codes are shifted to align the center channel with the correlated channel and to displace the early and late channel reference PN codes to one side and the other of the center channel. In one embodiment, the displacement is one-third chip, and in another embodiment, the displacement is one-half chip. In one embodiment for initial tracking, the three channels are displaced one chip from each other and, after failure to attain correlation in any of the channels, the three channels are displaced three chips to again seek synchronization. Initial Tracking, following initial synchronization, detects changes in correlation in the three channels, and adjust the frequency and/or the phase of the three reference PN codes to return the reference PN codes into a desired relationship with the transmitted PN code. In one embodiment of tracking, clockwise and counterclockwise cyclic permutation of the three reference PN codes is used to maintain alignment between the three reference PN codes and the transmitted PN code. In other embodiments, the condition of correlation, or lack thereof, in each channel is stored in a register and shifting of the reference PN codes is performed in response to the status of the register.

대표청구항 ▼

A sliding correlator comprising: means for detecting a sine component and a cosine component of an input signal; means for digitizing the sine and cosine component to produce sine and cosine digitized components; means for generating a reference PN code, frequency of the PN code being similar tot hat of the input signal; means for determining a correlation between the digitized sine and cosine components output from the digitizing means and sine and cosine components of the reference PN code generated by the reference PN code generating means, the determining means comprising both a first correlating unit for determining a correlation between the digitized sine component and the sien component of the generated reference PN code and a second correlating unit for determining a correlation between the digitized cosine component and the cosine component of the generated reference PN code; means for generating at least three clock signals and outputting a desired one for use in the means for digitizing and means for generating a reference PN code, each of the at least three clock signals having a predetermined frequency, and phases of the clock signals being deviated a predetermined amount from each other, whereby the reference PN code generating menas being capable of generating at least three PN codes; and means for controlling an output signal to be output from the sliding correlator by selecting one of the clock signals in accordance with an output of the means for determining a correlation, the controlling means being designed to output a control signal. Apparatus adapted to be positioned in a sliding correlator for synchronizing a transmitted PN code with a reference PN code to be generated therein, frequency values of the transmitted PN code and the generated reference PN code being substantially the same with each other, comprising: means for generating first, second and third reference PN codes; the first, second and third reference PN codes including transmitted PN code; the first, second and third reference PN codes being displaced in phase from each other; means for checking whether one of correlated values of the reference PN codes exceeds a predetermined threshold value; and means for shifting in phase each of the reference PN codes a predetermined value to the correlated one.

이 특허를 인용한 특허 (54)

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Ozluturk,Fatih M.; Lomp,Gary R.; Kowalski,John, Initial power control for spread-spectrum communications.
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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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이 특허를 인용한 특허 (54)

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