[특허]Wireless positioning means, wireless positioning apparatus and mobile position control center apparatus

[미국특허] Wireless positioning means, wireless positioning apparatus and mobile position control center apparatus 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/20
출원번호	US-0616314 (2000-07-17)
우선권정보	JP-11-351115(1999-12-10)
발명자 / 주소	Kuwahara,Mikio Doi,Nobukazu
출원인 / 주소	Hitachi, Ltd.
대리인 / 주소	Mattingly, Stanger, Malur &
인용정보	피인용 횟수 : 24 인용 특허 : 7

초록 ▼

The invention intends to solve a problem that an S/I ratio of a signal from a target base station deteriorates when there is a terminal near another base station. For this purpose, a signal replica of the signal from the nearby base station is generated and the replica is subtracted from a receiving signal. A signal of the target base station is detected from the resultant receiving signal. The signal from the nearby base station is deleted from the denominator of the S/I ratio, thereby increasing the S/I ratio.

대표청구항 ▼

What is claimed is: 1. A wireless positioning method for estimating a position of a terminal by using reception timings of signals transmitted from at least first and second base stations in a cellular communication system, comprising: a first step of storing received signals from a plurality of base stations in a storing circuit; a second step of reading out received signals stored in the storing circuit and measuring a reception timing of a received signal from the first base station having a power higher than that of a received signal from a second base station; a third step of canceling the received signal from the first base station from stored received signals; a fourth step of reading out received signals stored in the storing circuit and measuring a reception timing of the received signal from the second base station after the second step, wherein the third step comprises: a fifth step of forming a replica of the received signal of the first base station from the stored signals; a sixth step of subtracting the replica from the stored signals and overwriting the signals stored in the storing circuit with a result of the subtraction step; and a seventh step of forming the replica by processing a component of the received signal from the first base station in a procedure of despreading, demodulation and respreading by using the code division multiple access (CDMA) system. 2. A wireless positioning method according to claim 1, wherein the seventh step includes an eighth step of amplifying a received signal after the despreading, demodulation and respreading. 3. A wireless positioning method according to claim 2, wherein the eighth step includes a ninth step of correcting at least one of amplitude fluctuation and phase rotation by a signal propagation path from the first base station. 4. A wireless positioning apparatus comprising: a signal processor for canceling a received signal from a first base station whose reception power is higher than that of a received signal from a second base station in a cellular communication system; a CPU for processing an output signal of the signal processor; a storing circuit for storing the received signals from the first and second base stations, and a timing measurement circuit for measuring reception timings of the signals received from the first and second base stations based on signals stored in the storing circuit, wherein the signal processor has: a replica signal generating circuit for generating a replica of the received signal of the first base station from the signals stored in the storing circuit; and a subtraction circuit for subtracting the replica from the stored signals, wherein the stored signals are overwritten with a result of the subtraction and the timing measurement circuit measures the reception timing of the signal received from the second base station based on the overwritten signals in the storing circuit, and wherein the replica signal generating circuit has: a despreading circuit for despreading a component of a received signal from the first base station by using a code division multiple access system (CDMA); a demodulating circuit for demodulating an output signal of the despreading circuit; and a respreading circuit for respreading an output signal of the demodulating circuit. 5. A wireless positioning apparatus according to claim 4, further comprising an amplifying circuit for amplifying an output signal of the respreading circuit. 6. A wireless positioning apparatus according to claim 5, further comprising a correcting circuit for correcting at least one of amplitude fluctuation and phase rotation by a signal propagation path from the first base station.

이 특허에 인용된 특허 (7) 인용/피인용 타임라인 분석

Fukasawa Atsushi (Tokyo JPX) Kawabe Manabu (Tokyo JPX) Kawahashi Akiyoshi (Tokyo JPX) Sato Takuro (Tokyo JPX), Block-spreading code-division multiple-access demodulator with improved interference cancellation.
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Sawahashi Mamoru,JPX ; Andou Hidehiro,JPX ; Miki Yoshinori,JPX ; Higuchi Kenichi,JPX, CDMA demodulating apparatus.
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Casabona Mario M. ; Rosen Murray W. ; Hurley Bernard W., Digital interference suppression system for radio frequency interference cancellation.
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Stilwell James H. (Mesa AZ) Meidan Reuven (Ramat Hasharon IL ILX) Kotzin Michael (Buffalo Grove IL), Method and apparatus for cancelling spread-spectrum noise.
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Bruckert Eugene J. ; Kotzin Michael D., Method and system for aiding in the location of a subscriber unit in a spread spectrum communication system.
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Yang Lin-Lang, Signal detection and interference cancellation based on simplified matrix inversion for CDMA applications.
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van Heeswyk Frank Martin,CAX ; Newson Paul,CAX, System and method for cancelling the extra interference created during position location in a CDMA cellular system.
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이 특허를 인용한 특허 (24) 인용/피인용 타임라인 분석

Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul Matthew; Ginter, Thomas Stephen; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul Matthew; Ginter, Thomas Stephen; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul Matthew; Ginter, Thomas Stephen; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Anderson, Robert J.; Bull, Jeffrey F.; Czarnecki, Paul; Ginter, Thomas Stephan; Ward, Matthew L., Advanced triggers for location-based service applications in a wireless location system.
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Wang, Michael M.; Palanki, Ravi; Bhushan, Naga, Cell detection with interference cancellation.
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Sikri, Divaydeep; Abrishamkar, Farrokh; McCloud, Michael, Enhanced geran receiver using channel input beamforming.
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Ward, Matthew L.; Czarnecki, Paul M; Anderson, Robert J., Geo-fencing in a wireless location system.
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Sikri, Divaydeep; Abrishamkar, Farrokh; De Laurentiis, Nico, Hybrid SAIC receiver.
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Jou, Yu-Chen; Black, Peter J.; Attar, Rashid Ahmed A., Increasing capacity in wireless communication.
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Jou, Yu-Cheun; Black, Peter J.; Attar, Rashid Ahmed A., Increasing capacity in wireless communications.
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Jou, Yu-Cheun; Black, Peter J.; Attar, Rashid Ahmed A., Increasing capacity in wireless communications.
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Liang, Jiye; Fan, Mingxi; Xue, Yisheng, Increasing capacity in wireless communications.
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Xue, Yisheng; Fan, Mingxi; Liang, Jiye, Increasing capacity in wireless communications.
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Black, Peter J.; Lott, Christopher G.; Attar, Rashid A.; Jou, Yu-Cheun; Ma, Jun, Interference cancellation for wireless communications.
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Sikri, Divaydeep; Abrishamkar, Farrokh; Yan, Ming; De Laurentiis, Nico, Interference cancellation under non-stationary conditions.
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Sikri, Divaydeep; Abrishamkar, Farrakh, Iterative interference cancellation receiver.
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Kangas, Ari; Siomina, Iana, Method and arrangement in a telecommunication system.
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Abrishamkar, Farrokh; Sikri, Divaydeep; Challa, Raghu N.; Canpolat, Bahadir, Multi-stage interference suppression.
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Bull, Jeffrey F.; Ward, Matthew L., Network autonomous wireless location system.
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Smee, John Edward; Hou, Jilei; Padovani, Roberto; Black, Peter John; Easton, Kenneth D., Reverse link interference cancellation.
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Sikri, Divaydeep; Dede, Erdogan; Abrishamkar, Farrokh; Children, Philip J. C.; De Laurentiis, Nico, Semi-coherent timing propagation for GERAN multislot configurations.
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Wang, Michael M., Successive detection and cancellation for cell pilot detection.
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Canpolat, Bahadir; Abrishamkar, Farrokh; Sikri, Divaydeep, Symbol estimation methods and apparatuses.
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Brown, Jim; Zhang, Gengsheng; Garin, Lionel, Synchronizing a radio network with end user radio terminals.
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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Wireless positioning means, wireless positioning apparatus and mobile position control center apparatus 원문보기