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1.
公开(公告)号:HUE039201T2
公开(公告)日:2018-12-28
申请号:HUE08862908
申请日:2008-12-17
Applicant: QUALCOMM INC
Inventor: ROWITCH DOUGLAS NEAL
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2.
公开(公告)号:ES2683729T3
公开(公告)日:2018-09-27
申请号:ES08862908
申请日:2008-12-17
Applicant: QUALCOMM INC
Inventor: ROWITCH DOUGLAS NEAL
Abstract: Un procedimiento para ser usado por un dispositivo inalámbrico portátil (102), comprendiendo el procedimiento: acceder a datos de movimiento relacionados con el movimiento del dispositivo inalámbrico portátil (510); determinar una velocidad de adquisición de señal de red inalámbrica basándose en los datos de movimiento (512); iniciar un primer intento para obtener suficiente información de una señal de red inalámbrica para permitir el procesamiento de la señal inalámbrica recibida para obtener los datos transmitidos en la misma (514); iniciar un segundo intento para obtener suficiente información de una señal de red inalámbrica para permitir el procesamiento de la señal inalámbrica recibida para obtener los datos transmitidos en la misma (514), iniciándose el segundo intento una duración después del inicio del primer intento, basándose la duración en la velocidad de adquisición de señal inalámbrica determinada, caracterizado por que el procedimiento comprende además iniciar intentos adicionales para obtener suficiente información de una señal de red inalámbrica para permitir el procesamiento de la señal de red inalámbrica recibida para obtener los datos transmitidos en la misma, iniciándose cada intento adicional una duración después del inicio del intento anterior, basándose la duración en la velocidad de adquisición de señal inalámbrica determinada, e incluyendo la prevención de intentos adicionales una vez que se ha obtenido suficiente información para permitir el procesamiento de la señal de red inalámbrica recibida.
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公开(公告)号:CA2730131A1
公开(公告)日:2010-01-21
申请号:CA2730131
申请日:2009-07-17
Applicant: QUALCOMM INC
Inventor: LIN IE-HONG , ROWITCH DOUGLAS NEAL , FISCHER SVEN
IPC: G01S1/00
Abstract: Methods and apparatuses are provided for use by devices within a wireless communication network to request and/or provide sensitivity assistance information signals associated with one or more Satellite Positioning Systems (SPSs).
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公开(公告)号:AU2003284883B2
公开(公告)日:2009-07-09
申请号:AU2003284883
申请日:2003-10-22
Applicant: QUALCOMM INC
Inventor: SIMIC EMILIJA , PATRICK CHRISTOPHER , ROWITCH DOUGLAS NEAL
Abstract: Position determination accuracy of a wireless communication device may be negatively affected by a large unaccounted GPS doppler bias, which in turn may affect GPS doppler estimations and GPS doppler measurements conducted by the wireless communication device. The quality of GPS doppler measurements is very important for position location, because poor quality GPS doppler measurements may prevent the wireless communication device from acquiring satellites in the most sensitive modes with narrow frequency ranges, which results in reduced GPS pseudorange measurement yield. Large unaccounted GPS doppler bias also adversely affects position accuracy because of the adverse effect on the GPS code phase measurements time propagation to common time prior to their use in position location calculation. The same is true in the case of unaccounted CDMA code doppler, through the adverse effect on the AFLT code phase measurements time propagation to common time prior to their use in a position location engine. This effect is the biggest concern in the case of large search windows. Therefore, the present disclosure provides a method of optimizing GPS based position location in the presence of time-varying frequency error, including the steps of continuously measuring and/or calculating resulting GPS doppler bias and CDMA code doppler bias and then minimizing their adverse effects with regard to position location determination by re-centering GPS doppler search windows based on the GPS doppler bias value, as well as using GPS doppler bias and CDMA code doppler bias value to properly propagate GPS pseudorange and AFLT pilot phase measurements, respectively, to common time prior to their use in a position location engine.
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公开(公告)号:BR0315521A
公开(公告)日:2005-09-20
申请号:BR0315521
申请日:2003-10-22
Applicant: QUALCOMM INC
Inventor: SIMIC EMILIJA , PATRICK CHRISTOPHER , ROWITCH DOUGLAS NEAL
Abstract: Position determination accuracy of a wireless communication device may be negatively affected by a large unaccounted GPS doppler bias, which in turn may affect GPS doppler estimations and GPS doppler measurements conducted by the wireless communication device. The quality of GPS doppler measurements is very important for position location, because poor quality GPS doppler measurements may prevent the wireless communication device from acquiring satellites in the most sensitive modes with narrow frequency ranges, which results in reduced GPS pseudorange measurement yield. Large unaccounted GPS doppler bias also adversely affects position accuracy because of the adverse effect on the GPS code phase measurements time propagation to common time prior to their use in position location calculation. The same is true in the case of unaccounted CDMA code doppler, through the adverse effect on the AFLT code phase measurements time propagation to common time prior to their use in a position location engine. This effect is the biggest concern in the case of large search windows. Therefore, the present disclosure provides a method of optimizing GPS based position location in the presence of time-varying frequency error, including the steps of continuously measuring and/or calculating resulting GPS doppler bias and CDMA code doppler bias and then minimizing their adverse effects with regard to position location determination by re-centering GPS doppler search windows based on the GPS doppler bias value, as well as using GPS doppler bias and CDMA code doppler bias value to properly propagate GPS pseudorange and AFLT pilot phase measurements, respectively, to common time prior to their use in a position location engine.
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公开(公告)号:BRPI0916706A2
公开(公告)日:2015-11-10
申请号:BRPI0916706
申请日:2009-07-17
Applicant: QUALCOMM INC
Inventor: ROWITCH DOUGLAS NEAL , LIN IE-HONG , FISCHER SVEN
IPC: G01S1/00
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公开(公告)号:ES2424013T3
公开(公告)日:2013-09-26
申请号:ES09771125
申请日:2009-06-26
Applicant: QUALCOMM INC
Inventor: FARMER DOMINIC GERARD , WU JIE , DAITA LALITAPRASAD V , ROWITCH DOUGLAS NEAL , RILEY WYATT THOMAS
IPC: G01S19/34
Abstract: Un procedimiento que comprende: con circuitos (308) de localización de posición operando en una primera modalidad (202), adquirir señales inalámbricasasociadas a un sistema de posicionamiento por satélite, SPS (106); conmutar selectivamente dichos circuitos (308) de localización de posición, desde dicha primera modalidad (202) a unasegunda modalidad (204), en base, al menos en parte, a satisfacerse al menos una prueba de conmutación demodalidad, en el que dicha al menos una prueba de conmutación de modalidad se basa, al menos en parte, en al menosuna condición de prueba no temporizada, comprendiendo dicha al menos una condición de prueba no temporizada almenos una primera condición de prueba, en la cual se determina si las señales inalámbricas, con al menos una potenciade señal de un primer umbral, han sido adquiridas desde un primer conjunto de vehículos espaciales, SV; y con dichos circuitos (308) de localización de posición operando en dicha segunda modalidad (204), mantener informaciónde reloj local y no adquirir más dichas señales inalámbricas, o bien adquirir dichas señales inalámbricas con menosfrecuencia que durante dicha primera modalidad (202).
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公开(公告)号:HK1055180A1
公开(公告)日:2003-12-24
申请号:HK03107435
申请日:2003-10-15
Applicant: QUALCOMM INC
Inventor: ROWITCH DOUGLAS NEAL , LEE WAY-SHING , EKVETCHAVIT THUNYACHATE
Abstract: Demodulator architectures for processing a received signal in a wireless communications system. The demodulator includes a number of correlators coupled to a combiner. Each correlator typically receives and despreads input samples (which are generated from the received signal) with a respective despreading sequence to provide despread samples. Each correlator then decovers the despread samples to provide decovered “half-symbols” and further demodulates the decovered half-symbols with pilot estimates to generate correlated symbols. The decovering is performed with a Walsh symbol having a length (T) that is half the length (2T) of a Walsh symbol used to cover the data symbols in the transmitted signal. The combiner selectively combines correlated symbols from the assigned correlators to provide demodulated symbols. One or more correlators can be assigned to process one or more instances of each transmitted signal. The pilot estimates used within each assigned correlator to demodulate the decovered half-symbols are generated based on the signal instance being processed by that correlator.
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公开(公告)号:AU2003228836A1
公开(公告)日:2003-11-17
申请号:AU2003228836
申请日:2003-05-02
Applicant: QUALCOMM INC
Inventor: ROWITCH DOUGLAS NEAL
IPC: G01S19/03 , G01S1/00 , G01S5/14 , G01S19/04 , G01S19/05 , G01S19/07 , G01S19/10 , G01S19/11 , G01S19/25 , G01S19/41 , G01S19/44 , G01S1/02
Abstract: A method of wireless communications according to one embodiment of the invention includes obtaining a first time base (e.g. obtaining a code phase) from a signal received from a ground transmitter (e.g. a CDMA base station). A predetermined offset based on at least a propagation delay of the received signal is applied to the first time base to obtain a second time base. For example, the second time base may be aligned to a time base of a positioning satellite system (e.g. the NAVSTAR GPS). A timing signal is generated that has a code phase based on the second time base.
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