[특허]Cell site demodulation architecture for a spread spectrum multiple access communication systems

Cell site demodulation architecture for a spread spectrum multiple access communication systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-014/707
출원번호	US-0372632 (1995-01-13)
발명자 / 주소	Levin Jeffrey A. (San Diego CA) Werner David E. (San Diego CA) Easton Kenneth D. (San Diego CA)
출원인 / 주소	Qualcomm Incorporated (San Diego CA 02)
인용정보	피인용 횟수 : 106 인용 특허 : 0

초록 ▼

An integrated demodulation processor used in a modem for a spread spectrum communications system despreads multipath receive signals then uses a time sliced transform processor to process the multiple signals in to a single series of soft decision results. The demodulation processor uses a single transform engine which operates on a time slice basis. The output of the processor engine cascade through a pipeline processor which, on a time slice basis, operates on signals corresponding to each multipath receive signal. The processed results are dual maxima decoded to provide soft decision data.

대표청구항 ▼

A pipelined demodulation processor receiving an antenna signal comprised of a group of spread spectrum modulated call signals sharing a common frequency band and processing an active call signal within said group of spread spectrum modulated call signals, said active call signal originating from a remote transmitting unit, said pipelined demodulation processor comprising: a plurality of demodulation element front ends for receiving data samples of said group of spread spectrum modulated call signals wherein each of said spread spectrum modulated call signals comprises a series of bits encoded in groups of a fixed length into a series of symbols comprised of a series of code chips having a transmission rate and wherein said data samples are received at a rate corresponding to said transmission rate, and for providing despread code chips; a chip buffer for receiving said despread code chips from each of said plurality of demodulation element front ends and storing a limited number of said despread code chips to collect a set of said despread code chips to create a first element symbol from a first one of said plurality of demodulation element front ends and corresponding to a first transmitted symbol; a transform processor engine for receiving from said chip buffer said first element symbol and decoding said first element symbol to produce a first series of estimates wherein said first series of estimates comprises an energy level corresponding to each possible code sequence of said corresponding series of bits wherein said transform processor engine decodes said first element symbol at a rate higher than said transmission rate; a combiner for receiving and storing said first series of estimates; a maximum detector for receiving said first series of estimates and determining a maximum energy level and corresponding code sequence of said first series of estimates; and a time tracking block for receiving an indication of said code sequence corresponding to said maximum energy level and for providing an advance or retard indication to said first one of said demodulation element front ends.

이 특허를 인용한 특허 (106)

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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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Cell site demodulation architecture for a spread spectrum multiple access communication systems 원문보기

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Cell site demodulation architecture for a spread spectrum multiple access communication systems 원문보기

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