[특허]Method and apparatus for parallel noncoherent correlation of a spread spectrum signal

[미국특허] Method and apparatus for parallel noncoherent correlation of a spread spectrum signal 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-017/07
출원번호	US-0486824 (1995-06-07)
발명자 / 주소	Durrant Randolph L. Burbach Mark
출원인 / 주소	Omnipoint Corporation
대리인 / 주소	Lyon & Lyon LLP
인용정보	피인용 횟수 : 10 인용 특허 : 180

초록 ▼

A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the I and Q data streams using CPM or a related technique, and superposes the plurality of resultants for transmission. A receiver receives the superposed spread spectrum signal and simultaneously attempts to correlate for a plurality of chip sequences (such as I and Q chip sequences), and interleaves the correlated I and Q data streams into a unified signal data stream. In one embodiment, the receiver separates the received spread spectrum signal into real and imaginary parts, attempts to correlate both real and imaginary parts for a plurality of chip sequences, and combines the real I, real Q, imaginary I, and imaginary Q signals into a unified signal data stream. The demodulating reference signal in the receiver may or may not be frequency or phase matched with the transmitter. In other embodiments, single bit or multi-bit digitization of the received spread spectrum signal for both I and Q signals (or real I, real Q, imaginary I, and imaginary Q signals) is carried out prior to correlation. In another embodiment, the transmitter differentially phase encodes the information to be transmitted, and the receiver decodes the phase encoded information by determining a quantized phase angle of the received signal.

대표청구항 ▼

[ We claim:] [1.] A method for despreading a received continuous phase modulated spread spectrum signal comprising the steps of:dividing a received spread spectrum signal into a first signal and a second signal, said first and second signal being duplicates of one another,demodulating said first signal into a real-I/imaginary-Q signal using a first non-coherent local reference signal,demodulating said second signal into an imaginary-I/real-Q signal using a second non-coherent local reference signal having the same frequency as said first non-coherent local reference signal but phase offset therefrom by 90 degrees,temporarily storing said real-I/imaginary-Q signal in a single first register,temporarily storing said imaginary-I/real-Q signal in a single second register,correlating the contents of said first register to generate a real I correlation signal and an imaginary Q correlation signal, said contents of said first register comprising odd and even chips, said odd chips being correlated with odd chips of a chip sequence and said even chips being correlated with inverses of even chips of said chip sequence,correlating the contents of said second register to generate an imaginary I correlation signal and a real Q correlation signal, said contents of said second register comprising odd and even chips, said odd chips being correlated with odd chips of said chip sequence and said even chips being correlated with said even chips of said chip sequence, andcombining said real I correlation signal, said real Q correlation signal, said imaginary I correlation signal and said imaginary Q correlation signal into a final correlation signal.

이 특허에 인용된 특허 (180) 인용/피인용 타임라인 분석

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Tiedemann ; Jr. Edward G. (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Kerr Richard J. (San Diego CA) Geib Kenneth M. (Encinitas CA), Apparatus and method for reducing power consumption in a mobile communications receiver.
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Halpern Peter H. (Longwood FL) Mallory Peter E. (Edgewater FL) Haug Paul E. (Sanford FL) Koos ; Jr. William M. (Altamonte Spring FL), Apparatus for synchronizing linear PN sequences.
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Chung Kah-Seng (Eindhoven NLX) Verstappen Hendrikus L. (Hilversum NLX), Arrangement for generating an angle-modulated carrier signal of a constant amplitude in response to data signals.
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Hui Yu N. (North Plainfield NJ), Asynchronous communication system.
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Jacobson Allen G. (Ramsey NJ) Schilling Donald L. (Sands Point NY) Henrich Kenneth J. (Stony Brook NY), Broadcast synchronized communication system.
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Higgins Robert P. (Seattle WA), CCD demodulator/correlator.
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Gilhousen Klein S. (San Diego CA) Antonio Franklin P. (Del Mar CA), CDMA microcellular telephone system and distributed antenna system therefor.
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Endo Kaoru (Osaka JPX) Takahashi Naomichi (Osaka JPX) Tsumura Soichi (Osaka JPX), CSK communication system.
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Horwitz Lawrence B. (Alpharetta GA) Wiggins Eugene T. (Dunwoody GA), Code division multiplexer using direct sequence spread spectrum signal processing.
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Hostetter George R. (Santa Clara CA) Babitch Daniel (San Jose CA), Code position modulation system and method for multiple user satellite communications.
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Fukasawa Atsushi (Tokyo JPX) Kawabe Manabu (Tokyo JPX) Kawahashi Akiyoshi (Tokyo JPX) Sato Takuro (Tokyo JPX), Code-division multiple-access communication system providing enhanced capacity within limited bandwidth.
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Lee Edward K. B. (Sunrise FL) Cadd Jimmy (Coral Springs FL) Fulghum Tracy L. (Sunrise FL) Babayi Robert S. (Sunrise FL), Communication method for an adaptive direct sequence CDMA communication system.
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Clark Duncan G. D. (Blackwater ; Nr. Camberley GB2) Kimber Ian D. (Bracknell GB2) May Roderick G. (Wealdstone GB2), Communication over noisy lines.
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Amitay Noach (Tinton Falls NJ), Cordless accessed high-speed high-capacity local area networks.
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Kato Shuzo (Yokohama JPX) Feher Kamilo (Ottawa CAX), Correlated signal processor.
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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

[미국특허] Method and apparatus for parallel noncoherent correlation of a spread spectrum signal 원문보기

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[미국특허] Method and apparatus for parallel noncoherent correlation of a spread spectrum signal 원문보기

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