[특허]Code division multiple access mobile communication system

Code division multiple access mobile communication system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/00
출원번호	US-0786092 (2004-02-26)
등록번호	US-7336697 (2008-02-26)
우선권정보	JP-7-232227(1995-09-11)
발명자 / 주소	Ohgoshi,Yasuo Yano,Takashi Doi,Nobukazu
출원인 / 주소	Hitachi, Ltd.
대리인 / 주소	Mattingly, Stanger, P.C., Malur & Brundidge, P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 27

초록 ▼

A code division multiple access (CDMA) mobile communication system with improvements to permit stable reception with a minimum of bit error. The system includes a base station and a mobile station for communicating with the base station. The mobile station includes an oscillator, a radio frequency demodulator for demodulating a radio frequency band signal received from the base station by use of a first signal from the oscillator, a radio frequency modulator for modulating a second signal to be transmitted by use of the first signal from the oscillator, and an antenna for receiving the radio frequency band signal transmitted from the base station, and for transmitting the modulated second signal to the base station. An oscillation frequency of the oscillator is controlled by use of a change of phase shift detected using the demodulated radio frequency band signal received from the base station.

대표청구항 ▼

The invention claimed is: 1. A mobile station for communicating with a base station, comprising; an oscillator; a radio frequency demodulator for demodulating a radio frequency band signal received from said base station by use of a first signal from said oscillator; a radio frequency modulator for modulating a second signal to be transmitted by use of the first signal from said oscillator; and an antenna for receiving said radio frequency band signal transmitted from said base station, and for transmitting said modulated second signal to said base station, wherein an oscillation frequency of the oscillator is controlled by use of a change of phase shift detected using the demodulated radio frequency band signal received from the base station. 2. A mobile station according to claim 1, wherein the change of phase shift is detected using a pilot signal received from said base station. 3. A mobile station according to claim 2, wherein said pilot signal is extracted by despreading the demodulated radio frequency band signal using a spread spectrum code assigned to the pilot signal. 4. A method of transmitting a first signal from a mobile station to a base station, comprising the steps of: demodulating a radio frequency band signal received from said base station by use of a second signal from an oscillator; modulating the first signal to be transmitted by use of the second signal from the oscillator; and transmitting said modulated first signal, wherein an oscillation frequency of the oscillator is controlled by use of a change of phase shift detected using the demodulated radio frequency band signal received from the base station. 5. A method of transmitting a first signal from a mobile station according to claim 4, wherein said change of phase shift is detected using a pilot signal received from said base station. 6. A method of transmitting a first signal from a mobile station according to claim 5, further comprising the step of: despreading the demodulated radio frequency band signal to extract said pilot signal. 7. A mobile station which receives signals from a base station, comprising: an antenna for receiving said signals from said base station; an oscillator; a demodulator for demodulating said received signals using a signal from said oscillator, wherein an oscillation frequency of said oscillator is controlled by use of a change of phase shift detected using the demodulated signal received from the base station. 8. A mobile station according to claim 7, wherein said received signals include a pilot signal, and said change of phase shift is detected using said pilot signal. 9. A mobile station according to claim 8, further comprising: a despreader for despreading the demodulated signal to extract said pilot signal. 10. A mobile station for communicating with a base station, comprising: an antenna for receiving signals transmitted from said base station based on phase shift keying, and for transmitting signals to said base station; an oscillator; a demodulator for demodulating the received signals using a signal from said oscillator; a frequency correction circuit for controlling an oscillation frequency of the oscillator to correct frequency error based on a detected phase of the demodulated signal; and a phase correction circuit for correcting a phase of at least a part of the demodulated signals based on said detected phase of the demodulated signal. 11. A mobile station according to claim 10, wherein said phase correction circuit performs phase correction on a symbol basis. 12. A mobile station according to claim 10, said detected phase is a phase detected using a pilot signal received from said base station.

이 특허에 인용된 특허 (27)

Subramanian Ravi (East Brunswick NJ), All digital maximum likelihood based spread spectrum receiver.
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Kumagai Yoshiaki (Kawasaki JPX) Itaya Eiji (Kawasaki JPX) Endo Yoichi (Kawasaki JPX), Automatic frequency control circuit selectively using frequency-divided local oscillator signal or pilot signal.
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Choi Yang-seok (Kyungki-do KRX), Automatic frequency control method and apparatus therefor.
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Miya Kazuyuki,JPX ; Watanabe Masatoshi,JPX ; Kato Osamu,JPX, CDMA cellular radio transmission system.
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Ohgoshi Yasuo (Hachioji JPX) Doi Nobukazu (Hachioji JPX) Yano Takashi (Tokorozawa JPX), CDMA mobile communication system and method with improved phase correction features.
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Nakamura Shigeki (Kawasaki JPX) Takahashi Yasufumi (Yokohama JPX), Carrier recovery phase-locked loop.
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Ohgoshi Yasuo,JPX ; Yano Takashi,JPX ; Doi Nobukazu,JPX, Code division multiple access mobile communication system.
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Ohgoshi Yasuo,JPX ; Yano Takashi,JPX ; Doi Nobukazu,JPX, Code division multiple access mobile communication system.
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Yasuo Ohgoshi JP; Takashi Yano JP; Nobukazu Doi JP, Code division multiple access mobile communication system.
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Sekine Kiyoki,JPX ; Kawabe Manabu,JPX, Communication system, transmitter and receiver.
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Kobayashi Kenzo,JPX, Cross polarization interference canceler and cross polarization interference eliminating apparatus using the same.
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Pham Hiep V. (Germantown MD) Namioka Hirotaka (Tokyo JPX), Delay-locked loop circuit in spread spectrum receiver.
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Mohindra Rishi (Eindhoven NLX), Direct conversion receiver.
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Denheyer Brian John (7845 SE. 36th Ave. Portland OR 97202) Terry John David (745 16th St. ; NE. Salem OR 97301), Dual mode analog and digital cellular phone.
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Nossen Edward J. (Cherry Hill NJ), Fast frequency/code search.
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Jones William W. ; Kenney Thomas J., Method and apparatus for decoding trellis coded direct sequence spread spectrum communication signals.
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Smith Douglas G. ; Dixon Robert C. ; Vanderpool Jeffrey S., Multi-band, multi-mode spread-spectrum communication system.
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Farahati Nader (Cambridge GB2) Ng Samuel (Camberley GB2), Offset correction.
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Naruse Akiko,JPX ; Obayashi Arata,JPX ; Nakamura Ken,JPX, Spread spectrum communication apparatus.
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Sugita Takehiro (Kanagawa JPX), Spread spectrum communication apparatus and signal intensity detection apparatus.
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Ishigaki Yukinobu (Miura JPX) Matsumoto Takahisa (Yokohama JPX), Spread spectrum communication system.
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Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Weaver ; Jr. Lindsay A. (San Diego CA), Spread spectrum multiple access communication system using satellite or terrestrial repeaters.
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Kaku Tomoya,JPX, Spread spectrum signal receiving apparatus.
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Chiu Chen-Shu (Placentia CA), Synchronization preamble correlation detector and frequency estimator.
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Dohi Tomohiro (Yokohama JPX) Sawahashi Mamoru (Yokosuka JPX) Ohno Koji (Yokohama JPX), Transmission power control method and apparatus for mobile communications using a CDMA (code division multiple access) s.
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Armstrong John T. (297 S. Roosevelt Ave. Pasadena CA 91107) Richert John D. (460 Avocado Crest Rd. La Habra Heights CA 90631), Transmitted reference spread spectrum communication using a single carrier with two mutually orthogonal modulated basis.
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Ramesh Nallepilli Subramanian, Wireless telecommunications system that mitigates the effect of multipath fading.
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