Patents by Inventor Donald Leimer
Donald Leimer 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: 9037625Abstract: A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M?1) stage tapped delay line, downsamples the input samples and the output samples of each tapped delay line stage by a factor of M, and applies each of the M downsampled sample value streams to M allpass IIR filters, respectively. The M allpass IIR filtered sample streams are then summed and scaled by a factor of 1/M. The result can then be filtered by a digital channel filter.Type: GrantFiled: April 6, 2012Date of Patent: May 19, 2015Assignee: CSR TECHNOLOGY, INC.Inventors: Mark Alan Sturza, Donald Leimer
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Publication number: 20120254272Abstract: A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M?1) stage tapped delay line, downsamples the input samples and the output samples of each tapped delay line stage by a factor of M, and applies each of the M downsampled sample value streams to M allpass IIR filters, respectively. The M allpass IIR filtered sample streams are then summed and scaled by a factor of 1/M. The result can then be filtered by a digital channel filter.Type: ApplicationFiled: April 6, 2012Publication date: October 4, 2012Inventors: Mark Alan Sturza, Donald Leimer
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Patent number: 8176107Abstract: A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M-1) stage tapped delay line, downsamples the input samples and the output samples of each tapped delay line stage by a factor of M, and applies each of the M downsampled sample value streams to M allpass IIR filters, respectively. The M allpass IIR filtered sample streams are then summed and scaled by a factor of 1/M. The result can then be filtered by a digital channel filter.Type: GrantFiled: December 15, 2006Date of Patent: May 8, 2012Assignee: CSR Technology Inc.Inventors: Mark Alan Sturza, Donald Leimer
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Publication number: 20110205115Abstract: A wireless device including a transceiver that utilizes a power supply is described. The wireless device includes a Global Positioning System (“GPS”) section having a plurality of GPS subsystems and a power controller in signal communication with the power supply and GPS section, wherein the power controller is configured to selectively power each GPS subsystem from the plurality of GPS subsystems.Type: ApplicationFiled: December 31, 2008Publication date: August 25, 2011Applicant: SiRF Technology, Inc.Inventors: Steven A. Gronemeyer, Mark A. Sturza, Donald Leimer, Sanjai Kohli
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Patent number: 7889780Abstract: A method for estimating a Doppler spread and a signal-to-noise ratio of a received signal includes: (a) calculating one or more functions of a carrier component of the received signal at a first time point relative to a pilot signal embedded in the received signal; (b) Calculating the one or more functions of the carrier component of the received signal at a second time point relative to the pilot signal; (c) repeating steps (a) and (b) over multiple time periods, each time period being substantially longer than the second time, and accumulating the one or more functions for the first time points and the second time points; and (d) Deriving the Doppler spread and the signal-to-noise ration based on the accumulated one or more functions calculated at the first and second time points. In one embodiment, the first time point is substantially closer to the pilot signal than the second time point. The first time point is one symbol interval from the pilot signal.Type: GrantFiled: January 2, 2007Date of Patent: February 15, 2011Assignee: Sirf Technology, Inc.Inventor: Donald Leimer
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Patent number: 7466778Abstract: A frequency domain diversity DVB receiver device includes multiple antenna ports for receiving radio signals, and radio signal processing circuits connected to the antenna ports that convert the received radio signals into digital samples. The digital samples from the different antenna ports time-share a front-end processor which processes the digital samples to provide time-domain symbols. The time-domain symbols are stored in time-domain symbol buffers according to which of the antenna ports the time-domain symbols are received. A fast fourier transform circuit then retrieves the time-domain symbols and converts them frequency-domain symbols, which are then stored one or more frequency-domain symbol buffers according to the antenna ports the corresponding radio signals are received. A diversity processor which combines the frequency-domain symbols from the frequency-domain symbol buffers.Type: GrantFiled: December 21, 2006Date of Patent: December 16, 2008Assignee: SiRF Technology, Inc.Inventors: Sharath Ananth, Sanjai Kohli, Mark Alan Sturza, Donald Leimer
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Publication number: 20070206687Abstract: A frequency domain diversity DVB receiver device includes multiple antenna ports for receiving radio signals, and radio signal processing circuits connected to the antenna ports that convert the received radio signals into digital samples. The digital samples from the different antenna ports time-share a front-end processor which processes the digital samples to provide time-domain symbols. The time-domain symbols are stored in time-domain symbol buffers according to which of the antenna ports the time-domain symbols are received. A fast fourier transform circuit then retrieves the time-domain symbols and converts them frequency-domain symbols, which are then stored one or more frequency-domain symbol buffers according to the antenna ports the corresponding radio signals are received. A diversity processor which combines the frequency-domain symbols from the frequency-domain symbol buffers.Type: ApplicationFiled: December 21, 2006Publication date: September 6, 2007Inventors: Sharath Ananth, Sanjai Kohli, Mark Sturza, Donald Leimer
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Publication number: 20070183485Abstract: A method for estimating a Doppler spread and a signal-to-noise ratio of a received signal includes: (a) calculating one or more functions of a carrier component of the received signal at a first time point relative to a pilot signal embedded in the received signal; (b) Calculating the one or more functions of the carrier component of the received signal at a second time point relative to the pilot signal; (c) repeating steps (a) and (b) over multiple time periods, each time period being substantially longer than the second time, and accumulating the one or more functions for the first time points and the second time points; and (d) Deriving the Doppler spread and the signal-to-noise ration based on the accumulated one or more functions calculated at the first and second time points. In one embodiment, the first time point is substantially closer to the pilot signal than the second time point. The first time point is one symbol interval from the pilot signal.Type: ApplicationFiled: January 2, 2007Publication date: August 9, 2007Inventor: Donald Leimer
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Publication number: 20070156800Abstract: A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M?1) stage tapped delay line, downsamples the input samples and the output samples of each tapped delay line stage by a factor of M, and applies each of the M downsampled sample value streams to M allpass IRR filters, respectively. The M allpass IRR filtered sample streams are then summed and scaled by a factor of 1/M. The result can then be filtered by a digital channel filter.Type: ApplicationFiled: December 15, 2006Publication date: July 5, 2007Inventors: Mark Sturza, Donald Leimer
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Patent number: 6486828Abstract: An adaptive antenna array employs selective polarization nulling and spatial nulling to receive desired signals in the presence of jamming signals. The desired signals have the same circular polarization, and the array includes at least one antenna element having an opposite circular polarization to null jamming signals having an opposite circular polarization. A gain pattern for the array is selected to minimize signals having the same circular, or linear, polarization. The gain pattern is computed based on jamming signals received when no desired signals are transmitted, or selected based on measured desired signals.Type: GrantFiled: July 26, 2000Date of Patent: November 26, 2002Assignee: Western MultiplexInventors: Charles R. Cahn, Donald Leimer
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Patent number: 6081228Abstract: A Global Positioning System receiver incorporating a method of reducing the effect of common mode oscillator phase noise. Oscillator phase noise in the receiver is a basic limitation on narrowing the carrier tracking loop bandwidth and, therefore, on the achievable carrier-track C/No for a GPS receiver tracking a single satellite signal. However, when receiving several satellite signals, the receiver phase noise is common to all tracking loops and, in principle, can be removed by a common-mode rejection scheme. The phase noise contributed by the satellites is negligible in comparison with the phase noise contributed by the receiver's oscillator; hence, the common-mode rejection is improved by tracking multiple satellite signals.Type: GrantFiled: September 15, 1998Date of Patent: June 27, 2000Assignee: SiRF Technology, Inc.Inventor: Donald Leimer