[특허]Code-division multiple-access communication system providing enhanced capacity within limited bandwidth

Code-division multiple-access communication system providing enhanced capacity within limited bandwidth 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-013/02 H04J-013/04 H04B-001/707
출원번호	US-0261915 (1994-06-16)
우선권정보	JP-0165632 (1993-07-05)
발명자 / 주소	Fukasawa Atsushi (Tokyo JPX) Kawabe Manabu (Tokyo JPX) Kawahashi Akiyoshi (Tokyo JPX) Sato Takuro (Tokyo JPX)
출원인 / 주소	Oki Electric Industry Co., Ltd. (Tokyo JPX 03)
인용정보	피인용 횟수 : 116 인용 특허 : 0

초록 ▼

A code-division multiple-access spread-spectrum communication system uses pairs of spreading codes with rates of N/2 chips per data symbol to provide a capacity equivalent to that obtained in a conventional system with N chips per symbol. In the transmitter, identical input data are spread in parallel by both spreading codes, then used to modulate two orthogonal carrier signals, and the resulting radio-frequency signals are combined for transmission from an antenna. In the receiver, the received signal is demodulated by parallel multiplication with the two carrier signals, the resulting baseband signals are correlated with the two spreading codes, and the results are added.

대표청구항 ▼

A receiver for a code-division multiple-access spread-spectrum communication system, comprising: a receiving antenna for receiving a radio-frequency signal; a carrier generator for generating two mutually orthogonal carrier signals; a product demodulator, coupled to said carrier generator, to demodulate said radio-frequency signal by multiplication with one of said two mutually orthogonal carrier signals, thereby generating a baseband receive signal; another product demodulator, coupled to said carrier generator, to demodulate said radio-frequency signal by multiplication with the other of said two mutually orthogonal carrier signals, thereby generating another baseband receive signal; a first correlator, coupled to one of said product demodulators, to correlate one of said baseband receive signals with a first spreading code, thereby producing a first correlated signal; a second correlator, coupled to the other of said product demodulators, to correlate the other of said baseband receive signals with a second spreading code, thereby producing a second correlated signal; and an adder, coupled to said first and second correlators, to add said first and second correlated signals, thereby generating an output data signal.

이 특허를 인용한 특허 (116)

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Ozluturk, Fatih M.; Lomp, Gary R., Method employed by a base station for controlling initial power ramp-up using short codes.
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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

Code-division multiple-access communication system providing enhanced capacity within limited bandwidth 원문보기

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Code-division multiple-access communication system providing enhanced capacity within limited bandwidth 원문보기

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연구과제 타임라인

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