Patents by Inventor Jorgen S. Nielsen
Jorgen S. Nielsen 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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Publication number: 20100233974Abstract: A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures at least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.Type: ApplicationFiled: May 24, 2010Publication date: September 16, 2010Applicant: Research In Motion LimitedInventor: Jorgen S. Nielsen
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Patent number: 7725087Abstract: A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures at least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.Type: GrantFiled: June 30, 2009Date of Patent: May 25, 2010Assignee: Research In Motion LimitedInventor: Jorgen S. Nielsen
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Publication number: 20100119018Abstract: A system and method for obtaining a frequency error estimate representing the difference between a reference frequency and the frequency of a space-time transmit diversity signal is disclosed herein. The method includes taking the correlation of total sums, comprised of partial sums taken in defined first and second intervals, to represent the frequency error as the imaginary component of the correlation function.Type: ApplicationFiled: January 26, 2010Publication date: May 13, 2010Applicant: Research In Motion LimitedInventors: Xin Jin, Runbo Fu, Jorgen S. Nielsen
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Patent number: 7676008Abstract: A system and method for obtaining a frequency error estimate representing the difference between a reference frequency and the frequency of a space-time transmit diversity signal is disclosed herein. The method includes taking the correlation of total sums, comprised of partial sums taken in defined first and second intervals, to represent the frequency error as the imaginary component of the correlation function.Type: GrantFiled: July 12, 2007Date of Patent: March 9, 2010Assignee: Research In Motion LimitedInventors: Xin Jin, Runbo Fu, Jorgen S. Nielsen
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Publication number: 20100027594Abstract: A method and system of improving sensitivity in the demodulation of a received signal over an arbitrary measurement time epoch, the method comprising the steps of: correlating the received signal in a coherent fashion; and utilizing a Viterbi phase state keying trellis demodulation with a variable resolution of phase states over 360.degree. to demodulate the radio frequency phase trajectory of the signal throughout the measurement time epoch; and the system comprising a receiver for receiving a direct sequence spread spectrum signal, the receiver comprising: an antenna for receiving the direct sequence spread spectrum signal; a downconverter for downconverting the received signal, producing a downconverted signal; an analog to digital converter (60) to convert the downconverted signal to a digital signal; a despreader (80) for despreading and coherently correlating the digital signal to a known signal, creating a despread signal; and a processor for applying a Viterbi algorithm to the despread signal.Type: ApplicationFiled: September 3, 2009Publication date: February 4, 2010Applicant: RESEARCH IN MOTION LIMITEDInventor: Jorgen S. Nielsen
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Publication number: 20090262861Abstract: A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures as least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.Type: ApplicationFiled: June 30, 2009Publication date: October 22, 2009Applicant: RESEARCH IN MOTION LIMITEDInventor: Jorgen S. Nielsen
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Patent number: 7599452Abstract: A method and system of improving sensitivity in the demodulation of a received signal over an arbitrary measurement time epoch, the method comprising the steps of: correlating the received signal in a coherent fashion (80); and utilizing a Viterbi phase state keying trellis demodulation with a variable resolution of phase states over 360° to demodulate the radio frequency phase trajectory of the signal throughout the measurement time epoch (70); and the system comprising a receiver for receiving a direct sequence spread spectrum signal, the receiver comprising: an antenna (10) for receiving the direct sequence spread spectrum signal; a downconverter (40) for downconverting the received signal, producing a downconverted signal; an analog to digital converter (60) to convert the downconverted signal to a digital signal; a despreader (80) for despreading and coherently correlating the digital signal to a known signal, creating a despread signal; and a processor (70) for applying a Viterbi algorithm to the despreType: GrantFiled: November 27, 2002Date of Patent: October 6, 2009Assignee: Research In Motion LimitedInventor: Jorgen S. Nielsen
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Patent number: 7493109Abstract: A method and system of enabling auxiliary functions in a mobile device operable in a wireless network. A first data processor is configured to be operable with a mobile device application, and a second data processor is required for operation with the wireless network. An auxiliary function is configured to interface only with one of the processors. A data communication channel provided between the processors conveys data received by or sent from the mobile device through the wireless network. A message sent by one of the processors to the other through the data communication channel to enable the auxiliary function of the mobile device for the processor with which the auxiliary function is not interfaced.Type: GrantFiled: December 1, 2004Date of Patent: February 17, 2009Assignee: Research In Motion LimitedInventors: Arun Munje, Ahmed Farhad, Stewart Charles Morris, Jorgen S. Nielsen, Peiwei Wang
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Patent number: 7257179Abstract: A system and method for obtaining a frequency error estimate representing the difference between a reference frequency and the frequency of a space-time transmit diversity signal is disclosed herein. The method includes taking the correlation of total sums, comprised of partial sums taken in defined first and second intervals, to represent the frequency error as the imaginary component of the correlation function.Type: GrantFiled: March 6, 2002Date of Patent: August 14, 2007Assignee: Research In Motion LimitedInventors: Xin Jin, Runbo Fu, Jorgen S. Nielsen
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Patent number: 7242709Abstract: An adaptive generalized matched filter (AGMF) rake receiver system includes a rake receiver and an AGMF weight determination module. The rake receiver is coupled to a spread spectrum input signal and applies a vector of weight signals to the spread spectrum input signal to compensate for dependant noise and generate a decision variable. The AGMF weight determination module monitors the decision variable and generates the vector of weight signals, wherein optimal values for the vector of weight signals are calculated by the AGMF weight determination module by varying the vector of weight signals until the signal to noise ratio of the decision variable reaches a peak value.Type: GrantFiled: November 22, 2005Date of Patent: July 10, 2007Inventor: Jorgen S. Nielsen
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Patent number: 6987954Abstract: A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures as least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.Type: GrantFiled: May 15, 2002Date of Patent: January 17, 2006Assignee: Research in Motion LimitedInventor: Jorgen S. Nielsen
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Patent number: 6985518Abstract: An adaptive generalized matched filter (AGMF) rake receiver system includes a rake receiver and an AGMF weight determination module. The rake receiver is coupled to a spread spectrum input signal and applies a vector of weight signals to the spread spectrum input signal to compensate for dependant noise and generate a decision variable.Type: GrantFiled: December 14, 2001Date of Patent: January 10, 2006Assignee: Research In Motion LimitedInventor: Jorgen S. Nielsen
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Publication number: 20030045249Abstract: A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures as least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.Type: ApplicationFiled: May 15, 2002Publication date: March 6, 2003Inventor: Jorgen S. Nielsen
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Publication number: 20020154715Abstract: A system and method for obtaining a frequency error estimate representing the difference between a reference frequency and the frequency of a space-time transmit diversity signal is disclosed herein. The method includes taking the correlation of total sums, comprised of partial sums taken in defined first and second intervals, to represent the frequency error as the imaginary component of the correlation function.Type: ApplicationFiled: March 6, 2002Publication date: October 24, 2002Inventors: Xin Jin, Runbo Fu, Jorgen S. Nielsen
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Publication number: 20020080863Abstract: An adaptive generalized matched filter (AGMF) rake receiver system includes a rake receiver and an AGMF weight determination module. The rake receiver is coupled to a spread spectrum input signal and applies a vector of weight signals to the spread spectrum input signal to compensate for dependant noise and generate a decision variable.Type: ApplicationFiled: December 14, 2001Publication date: June 27, 2002Inventor: Jorgen S. Nielsen
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Patent number: 6249253Abstract: The time of arrival of a global positioning system signal and the time of arrival of a code division multiple access pilot signal, from a base station, are estimated at a mobile radiotelephone. Both estimates are performed relative to a local clock in the radiotelephone. These signals are calibrated for the time delay produced by the transmitter at the base station and the time delay produced by the receiver in the radiotelephone.Type: GrantFiled: April 13, 1999Date of Patent: June 19, 2001Assignee: Nortel Networks LimitedInventors: Jorgen S. Nielsen, Leo Strawczynski
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Patent number: 6194970Abstract: The invention includes analyzing the steering voltage applied to a crystal oscillator over time, and compensating for spurious frequency jumps in determining the drift rate of a crystal oscillator. The steering voltage may be used to estimate oscillator stability by comparing a projected steering voltage against an actual voltage after a simulated holdover period, or analyzing a steering voltage recorded over a period of time and evaluating rates of change. Spurious frequency jumps may be removed from data collected while not in an actual holdover, making the data more accurately represent the frequency drift rate of the oscillator. Also, the rate of occurrence of spurious frequency jumps while not in holdover may be monitored to provide information regarding the physical condition of the crystal.Type: GrantFiled: August 19, 1999Date of Patent: February 27, 2001Assignee: Nortel Networks CorporationInventors: Jorgen S. Nielsen, Richard Kerslake
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Patent number: 6118335Abstract: A high power amplifier (103, FIG. 7) comprises a basic power module (15, FIG. 7), a parameter generator (50, FIG. 7), an amplifier gain model (60, FIG. 7), and a predistortion module (40, FIG. 7). The high power amplifier amplifies a linear radio frequency signal with a minimum of distortion, even near its maximum power output, by using an adaptive predistortion algorithm comprising an amplifier gain model 60 based upon a polynomial function of the power module 15 gain function and a time constant. The input signal into the amplifier 103 is continually compared with the amplifier 103 output using a Kalman filter, and model parameters are generated to model 60, which generates distortion compensating values that are combined with the input signal in predistortion module 40 to produce a predistorted input signal into power module 15, which generates the amplifier output. Also described are a method (70, FIG. 8) of operating the power amplifier and a base station (101, FIG.Type: GrantFiled: May 6, 1999Date of Patent: September 12, 2000Assignee: Nortel Networks CorporationInventors: Jorgen S. Nielsen, David M. Tholl, Trevor A. Page