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公开(公告)号：BR9813494A
公开(公告)日：2000-11-14
申请号：BR9813494
申请日：1998-12-08
Applicant: QUALCOMM INC
Inventor： LEVIN JEFFREY A
IPC: H04B1/711 , H04B1/7073 , H04B1/7075 , H04B1/708 , H04B1/7085 , H04B1/7093 , H04B1/7113 , H04B7/26 , H04L27/22 , H04B1/707
Abstract: A system and method for performing the digital receive processing for multiple signals received over the same RF band is described. In a preferred embodiment of the invention, digital RF samples are stored in a queue which is accessed by a searcher (130) and demodulator (112). The searcher (130) and demodulator (112) are preferably located on the same integrated circuit along with the queue. The demodulator (112) demodulates a set of reverse link signals stored within the queue where each reverse link signal is received with at a particular time offset and processed using a particular channel code. The searcher (130) periodically searches for reverse link signals not being processed by the demodulator (112), and for access requests transmitted via the access channel. The searcher (130) preferably searches during the worthy power control groups of each reverse link signal, which corresponds to the two of sixteen power control groups transmitted during an eighth rate frame.
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公开(公告)号：AU2050200A
公开(公告)日：2000-06-26
申请号：AU2050200
申请日：1999-12-09
Applicant: QUALCOMM INC
Inventor： LEVIN JEFFREY A , RIDDLE CHRISTOPHER C , SHERMAN TOM B
IPC: H04B1/7117 , H04B1/7115 , H04B1/712 , H04B7/26 , H04B1/707
Abstract: A wireless receiver receiving multipath Wash-code symbols determines which of fingers 402, 410 have locked on a signal. Measurements of the correlation energies between the received signal and all possible symbols are stored in energy storage units 404, 412. The actual signals are combined in combiner 408. A maximum determiner 416 determines the most likely combined symbol, and an index for this symbol is fed back to the energy storage units. Lock detectors 406, 414 use the measurement for this fed-back symbol to determine whether the finger has locked onto a path. This determination is used to decide whether the next signal detected by that finger should be applied to the combiner.
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公开(公告)号：HK1015198A1
公开(公告)日：1999-10-08
申请号：HK98116185
申请日：1998-12-28
Applicant: QUALCOMM INC
Inventor： EASTON KENNETH D , LEVIN JEFFREY A
Abstract: An integrated search processor used in a modem for a spread spectrum communications system buffers receive samples and utilizes a time sliced transform processor operating on successive offsets from the buffer. The search processor autonomously steps through a search as configured by a microprocessor specified search parameter set, which can include the group of antennas to search over, the starting offset and width of the search window to search over, and the number of Walsh symbols to accumulate results at each offset. The search processor calculates the correlation energy at each offset, and presents a summary report of the best paths found in the search to use for demodulation element reassignment. This reduces the searching process related workload of the microprocessor and also reduces the modem costs by allowing a complete channel element modem circuit to be produced in a single IC.
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公开(公告)号：AU707834B2
公开(公告)日：1999-07-22
申请号：AU6997798
申请日：1998-06-04
Applicant: QUALCOMM INC
Inventor： EASTON KENNETH D , LEVIN JEFFREY A
IPC: H04L1/02 , H04B1/707 , H04B7/26 , H04J11/00 , H04J13/00 , H04L27/30 , H04Q7/20 , H04B1/69 , H04J13/02
Abstract: An integrated search processor used in a modem for a spread spectrum communications system buffers receive samples and utilizes a time sliced transform processor operating on successive offsets from the buffer. The search processor autonomously steps through a search as configured by a microprocessor specified search parameter set, which can include the group of antennas to search over, the starting offset and width of the search window to search over, and the number of Walsh symbols to accumulate results at each offset. The search processor calculates the correlation energy at each offset, and presents a summary report of the best paths found in the search to use for demodulation element reassignment. This reduces the searching process related workload of the microprocessor and also reduces the modem costs by allowing a complete channel element modem circuit to be produced in a single IC.
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公开(公告)号：AU1796199A
公开(公告)日：1999-05-31
申请号：AU1796199
申请日：1998-11-10
Applicant: QUALCOMM INC
Inventor： MILLER DAVID S , VIJAYAN RAJIV , ZEHAVI EPHRAIM , LEVIN JEFFREY A
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Patent Agency Ranking
公开(公告)号：CA2309062A1
公开(公告)日：1999-05-20
申请号：CA2309062
申请日：1998-11-10
Applicant: QUALCOMM INC
Inventor： ZEHAVI EPHRAIM , VIJAYAN RAJIV , MILLER DAVID S , LEVIN JEFFREY A
Abstract: The present invention is a system and method for increasing user capacity on a slotted random access channel in a spread spectrum communications system (100) by using a multi-part access probe (502). First and second parts (508, 510) of an access probe preamble (604) are modulated using a short PN code sequence (620), and the second part and remainder of the access probe (502) is modulated using a long PN code sequence. Information to be transmitted by the access probe (502) is modulated on the second part (606) of the access probe (502), and the access probe is transmitted so that the first part (508) of the probe preamble (604) falls within the boundaries of an access channel slot (402). In one embodiment, time slots (402) in access channels (400) used for access signal reception are made the length of the first part (508). In a further embodiment, time slots (402) in a plurality of adjacent access channels used for access signal reception may be longer than said first part (508) but are offset in time from each other by the length or period of the first part.
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公开(公告)号：MX9708514A
公开(公告)日：1998-02-28
申请号：MX9708514
申请日：1996-05-02
Applicant: QUALCOMM INC
Inventor： ZIV NOAM A , PADOVANI ROBERTO , LEVIN JEFFREY A , EASTON KENNETH D
IPC: H04L1/02 , H04B1/707 , H04B7/26 , H04J11/00 , H04J13/00 , H04L27/30 , H04Q7/20 , H04B07/26 , H04B01/707
Abstract: Un procesador de busqueda integrado (128) utilizado en un modem (110) para un sistema de comunicacion de espectro difundido, separa en una memoria intermedia (172) muestras de señales recibidas y utiliza un procesador transformador de intervalo de tiempo (120) que opera en desplazamientos sucesivos a partir de la memoria intermedia (173). El procesador de busqueda (128) se acciona por etapas de manera autonoma a través de una busqueda segun se configuro por un conjunto de parámetros de busqueda específicos del microprocesador (136), el cual puede incluir el grupo de antenas para terminar la busqueda, el desplazamiento de inicio y la amplitud de la ventana de busqueda para terminar la busqueda y el numero de símbolos Walsh para acumular los resultados de cada desplazamiento. El procesador de busqueda (128) se calcula la energía de correlacion en cada desplazamiento y presenta un reporte sumario de la mejor trayectoria encontrada en la busqueda para utilizar la reinstalacion del elemento de demodulacion (122). La busqueda se hace de manera lineal independiente de la probabilidad de que una señal buscada haya sido transmitida en cualquier momento dado.
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公开(公告)号：AU685967B2
公开(公告)日：1998-01-29
申请号：AU2968395
申请日：1995-07-10
Applicant: QUALCOMM INC
Inventor： GILHOUSEN KLEIN S , WHEATLEY CHARLES E III , LEVIN JEFFREY A
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公开(公告)号：MX9604085A
公开(公告)日：1997-09-30
申请号：MX9604085
申请日：1996-01-16
Applicant: QUALCOMM INC
Inventor： LEVIN JEFFREY A , WERNER DAVID E , EASTON KENNETH D
Abstract: Un procesador de demodulacion integrado, utilizado en un modem para un sistema de comunicaciones de espectro extendido, reduce o limita las señales de recepcion de trayectoria multiple y posteriormente utiliza un procesador de transformacion de tiempo fraccionado para procesar las señales multiples en una sola serie de resultados de decision flexible o suave. El procesador de demodulacion utiliza un solo dispositivo de transformacion que opera con base en fracciones de tiempo. Las salidas del dispositivo procesador salen en cascada a través de un procesador de cable coaxial que, con base en fracciones de tiempo, opera sobre las señales correspondientes a cada señal de recepcion de trayectoria multiple. Los resultados procesados se descodifican por máximos duales para proporcionar datos de decision flexible o suave.
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公开(公告)号：AU4698896A
公开(公告)日：1996-07-31
申请号：AU4698896
申请日：1996-01-16
Applicant: QUALCOMM INC
Inventor： LEVIN JEFFREY A , WERNER DAVID E , EASTON KENNETH D
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