Patents by Inventor Emilija Simic
Emilija Simic has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10884134Abstract: Disclosed are devices, systems and techniques for propagating a system time maintained at a mobile device in a lower power mode using a sleep counter advanced by an XO crystal oscillator. In one particular implementation, a mobile device obtains initial and subsequent satellite positioning system fixes while in a higher power mode. Between the initial and subsequent position fixes, the mobile device may transition to a lower power mode during which measurements of a temperature of the XO crystal oscillator may be obtained.Type: GrantFiled: February 10, 2020Date of Patent: January 5, 2021Assignee: QUALCOMM IncorporatedInventors: Jie Wu, Dominic Gerard Farmer, Lalitaprasad Daita, Emilija Simic
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Publication number: 20200174137Abstract: Disclosed are devices, systems and techniques for propagating a system time maintained at a mobile device in a lower power mode using a sleep counter advanced by an XO crystal oscillator. In one particular implementation, a mobile device obtains initial and subsequent satellite positioning system fixes while in a higher power mode. Between the initial and subsequent position fixes, the mobile device may transition to a lower power mode during which measurements of a temperature of the XO crystal oscillator may be obtained.Type: ApplicationFiled: February 10, 2020Publication date: June 4, 2020Inventors: Jie WU, Dominic Gerard FARMER, Lalitaprasad DAITA, Emilija SIMIC
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Patent number: 10557944Abstract: Disclosed are devices, systems and techniques for propagating a system time maintained at a mobile device in a lower power mode using a sleep counter advanced by an XO crystal oscillator. In one particular implementation, a mobile device obtains initial and subsequent satellite positioning system fixes while in a higher power mode. Between the initial and subsequent position fixes, the mobile device may transition to a lower power mode during which measurements of a temperature of the XO crystal oscillator may be obtained.Type: GrantFiled: September 4, 2015Date of Patent: February 11, 2020Assignee: QUALCOMM IncorporatedInventors: Jie Wu, Dominic Farmer, Lalitaprasad Daita, Emilija Simic
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Publication number: 20160116598Abstract: Disclosed are devices, systems and techniques for propagating a system time maintained at a mobile device in a lower power mode using a sleep counter advanced by an XO crystal oscillator. In one particular implementation, a mobile device obtains initial and subsequent satellite positioning system fixes while in a higher power mode. Between the initial and subsequent position fixes, the mobile device may transition to a lower power mode during which measurements of a temperature of the XO crystal oscillator may be obtained.Type: ApplicationFiled: September 4, 2015Publication date: April 28, 2016Inventors: Jie Wu, Dominic Farmer, Lalitaprasad Daita, Emilija Simic
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Patent number: 8213487Abstract: A method according to an embodiment obtains a list of peaks for each of a number of frequency hypotheses. Each peak has an energy result and corresponds to a code phase hypothesis. Embodiments include methods and apparatus that may be used in identifying a location of a signal (such as a GPS signal) in a two-dimensional search space. Location information may be further applied to operations such as signal acquisition, signal tracking, position location of a receiver, and timing operations such as the synchronization of one or more other processes.Type: GrantFiled: July 26, 2010Date of Patent: July 3, 2012Assignee: QUALCOMM IncorporatedInventors: Emilija Simic, Douglas Neal Rowitch, Christopher Patrick
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Patent number: 8139685Abstract: A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.Type: GrantFiled: May 8, 2006Date of Patent: March 20, 2012Assignee: QUALCOMM IncorporatedInventors: Emilija Simic, Christopher Patrick, Raghu Challa, Douglas Neal Rowitch
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Publication number: 20110050496Abstract: Methods and apparatus are provided for use in devices enabled to perform waveform correlation processing of satellite positioning system (SPS) signals, including peak reconstruction.Type: ApplicationFiled: October 6, 2009Publication date: March 3, 2011Applicant: QUALCOMM IncorporatedInventors: Jie Wu, Emilija Simic
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Publication number: 20100316095Abstract: A method according to an embodiment obtains a list of peaks for each of a number of frequency hypotheses. Each peak has an energy result and corresponds to a code phase hypothesis. Embodiments include methods and apparatus that may be used in identifying a location of a signal (such as a GPS signal) in a two-dimensional search space. Location information may be further applied to operations such as signal acquisition, signal tracking, position location of a receiver, and timing operations such as the synchronization of one or more other processes.Type: ApplicationFiled: July 26, 2010Publication date: December 16, 2010Applicant: QUALCOMM IncorporatedInventors: Emilija Simic, Douglas Neal Rowitch, Christopher Patrick
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Patent number: 7764726Abstract: A method according to an embodiment obtains a list of peaks for each of a number of frequency hypotheses. Each peak has an energy result and corresponds to a code phase hypothesis. Embodiments include methods and apparatus that may be used in identifying a location of a signal (such as a GPS signal) in a two-dimensional search space. Location information may be further applied to operations such as signal acquisition, signal tracking, position location of a receiver, and timing operations such as the synchronization of one or more other processes.Type: GrantFiled: November 30, 2005Date of Patent: July 27, 2010Assignee: QUALOMM IncorporatedInventors: Emilija Simic, Douglas Rowitch, Christopher Patrick
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Publication number: 20070183484Abstract: A system, method and device for frequency acquisition. In particular, the embodiments allow for a mobile telephone to simultaneously receive data and/or voice signals while acquiring a GPS signal for its navigation feature. The system, method and device of the present embodiments employ a digital rotator and a local oscillator in concert to acquire the respective signals, correct any frequency errors associated with those signals, and maintain a local timing reference suitable for receiving and transmitting data through a mobile network while simultaneously providing an accurate location through a GPS system.Type: ApplicationFiled: October 25, 2006Publication date: August 9, 2007Inventors: Matthias Brehler, Raghu Challa, Amit Mahajan, Emilija Simic
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Publication number: 20070066268Abstract: A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.Type: ApplicationFiled: May 8, 2006Publication date: March 22, 2007Inventors: Emilija Simic, Christopher Patrick, Raghu Challa, Douglas Rowitch
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Publication number: 20060222058Abstract: A method according to an embodiment obtains a list of peaks for each of a number of frequency hypotheses. Each peak has an energy result and corresponds to a code phase hypothesis. Embodiments include methods and apparatus that may be used in identifying a location of a signal (such as a GPS signal) in a two-dimensional search space. Location information may be further applied to operations such as signal acquisition, signal tracking, position location of a receiver, and timing operations such as the synchronization of one or more other processes.Type: ApplicationFiled: November 30, 2005Publication date: October 5, 2006Inventors: Emilija Simic, Douglas Rowitch, Christopher Patrick
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Patent number: 7016688Abstract: A forward link repeater delay watermarking (FLRDWM) system and method that enable accurate position location of mobile stations in areas where repeaters are present by watermarking repeated signals with repeater information. A repeater watermarks a forward link signal with a (unique or non-unique) time delay modulation waveform watermark every time a signal passes through the repeater. A mobile station detects and/or identifies the time delay watermark on the forward link signal to determine repeater information that aids the network position determination entity or mobile station position location system in determining position location using AFLT and/or A-GPS systems. A forward link time delay watermarking system can be implemented to achieve low impact on FL and AFLT performance, favorable detection and identification probabilities, and short time-to-detect/identify.Type: GrantFiled: May 9, 2003Date of Patent: March 21, 2006Assignee: Qualcomm, IncorporatedInventors: Emilija Simic, Christopher Patrick, Douglas Rowitch, Luca Blessent, Roland Rick
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Patent number: 6961367Abstract: A forward link repeater frequency watermarking (FLRFWM) system and method that enable accurate position location of mobile stations in areas where repeaters are present by watermarking repeated signals with repeater information. A repeater watermarks a forward link signal with a (unique or non-unique) fast frequency modulation waveform watermark every time a signal passes through the repeater. A mobile station detects and/or identifies the fast frequency watermark on the forward link signal to determine repeater information that aids the network position determination entity or mobile station position location system in determining position location using AFLT and/or A-GPS systems. A forward link fast frequency watermarking system described herein achieves minimal impact on FL, AFLT, and GPS performance, good detection, identification and false alarm probabilities, short time-to-detect/identify, and good detection/identification sensitivity.Type: GrantFiled: March 17, 2003Date of Patent: November 1, 2005Assignee: QUALCOMM, IncorporatedInventors: Emilija Simic, Christopher Patrick
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Patent number: 6903684Abstract: 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.Type: GrantFiled: March 31, 2003Date of Patent: June 7, 2005Assignee: Qualcomm IncorporatedInventors: Emilija Simic, Christopher Patrick, Douglas Rowitch
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Publication number: 20040165657Abstract: A forward link repeater frequency watermarking (FLRFWM) system and method that enable accurate position location of mobile stations in areas where repeaters are present by watermarking repeated signals with repeater information. A repeater watermarks a forward link signal with a (unique or non-unique) fast frequency modulation waveform watermark every time a signal passes through the repeater. A mobile station detects and/or identifies the fast frequency watermark on the forward link signal to determine repeater information that aids the network position determination entity or mobile station position location system in determining position location using AFLT and/or A-GPS systems. A forward link fast frequency watermarking system described herein achieves minimal impact on FL, AFLT, and GPS performance, good detection, identification and false alarm probabilities, short time-to-detect/identify, and good detection/identification sensitivity.Type: ApplicationFiled: March 17, 2003Publication date: August 26, 2004Inventors: Emilija Simic, Christopher Patrick
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Publication number: 20040166873Abstract: A forward link repeater delay watermarking (FLRFWM) system and method that enable accurate position location of mobile stations in areas where repeaters are present by watermarking repeated signals with repeater information. A repeater watermarks a forward link signal with a (unique or non-unique) time delay modulation waveform watermark every time a signal passes through the repeater. A mobile station detects and/or identifies the time delay watermark on the forward link signal to determine repeater information that aids the network position determination entity or mobile station position location system in determining position location using AFLT and/or A-GPS systems. A forward link time delay watermarking system can be implemented to achieve low impact on FL and AFLT performance, favorable detection and identification probabilities, and short time-to-detect/identify.Type: ApplicationFiled: May 9, 2003Publication date: August 26, 2004Inventors: Emilija Simic, Christopher Patrick, Douglas Rowitch, Luca Blessent, Roland Rick
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Patent number: 6721368Abstract: Transmitter architectures for a communications system having improved performance over conventional transmitter architectures. The improvements include a combination of the following: faster response time for the control signals, improved linearity, reduced interference, reduced power consumption, lower circuit complexity, and lower costs. For a cellular application, these improvements can lead to increased system capacity, smaller telephone size, increased talk and standby times, and greater acceptance of the product. Circuitry is provided to speed up the response time of a control signal. The control loop for various elements in the transmit signal path are integrated. A gain control mechanism allows for accurate adjustment of the output transmit power level. Control mechanisms are provided to power down the power amplifier, or the entire transmit signal path, when not needed.Type: GrantFiled: March 4, 2000Date of Patent: April 13, 2004Assignee: Qualcomm IncorporatedInventors: Saed Younis, Emilija Simic, Thomas Wilborn, Haitao Zhang, Daniel Filipovic, Ralph Kaufman, Ming (Jason) Yu Lin
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Patent number: 6292122Abstract: An interface circuit for converting a digital signal to an analog signal. The interface circuit includes a time response adjustment circuit, a modulator, and a filter. The time response adjustment circuit receives the digital signal and generates an adjusted signal. The modulator couples to the time response adjustment circuit, receives the adjusted signal, and generates a modulator signal. The filter couples to the modulator, receives the modulator signal, and generates the analog signal. The analog signal has a time response that is modified by the time response adjustment circuit. In an embodiment, the time response adjustment circuit includes a gain element, a delay element, and a summer. The gain element receives and scales the digital signal by a scaling factor. The delay element receives and delays the digital signal by a time delay.Type: GrantFiled: March 4, 2000Date of Patent: September 18, 2001Assignee: Qualcomm, IncorporatedInventors: Saed Younis, Emilija Simic, Thomas Wilborn