Patents Assigned to Nautel Limited
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Patent number: 11855825Abstract: According to an aspect of the present invention, there is provided a method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.Type: GrantFiled: June 23, 2022Date of Patent: December 26, 2023Assignee: NAUTEL LIMITEDInventor: Philipp Schmid
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Patent number: 11700161Abstract: A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.Type: GrantFiled: September 25, 2019Date of Patent: July 11, 2023Assignee: NAUTEL LIMITEDInventors: Philipp Schmid, Brian Walker
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Patent number: 11381439Abstract: According to an aspect of the present invention, there is provided a method for providing additional bandwidth to receivers that can decode a higher modulation comprising trading a peak-to-average power ratio (PAPR) reduction induced constellation noise of all or a subset of in-band on-channel (IBOC) carriers within an orthogonal frequency division multiplexing (ODFM) waveform with data carrying superposition modulation.Type: GrantFiled: January 29, 2021Date of Patent: July 5, 2022Assignee: NAUTEL LIMITEDInventor: Philipp Schmid
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Patent number: 10469301Abstract: A system for peak-to-average-power ratio (PAPR) reduction of a frequency shifted plurality of digital broadcast signals taking into account the combined signal peaks in order to transmit the signals more efficiently in a single broadcast transmission system. The PAPR algorithm takes into account a rotating constellation phase offset for the shifted signals corresponding to the amount of applied frequency shift. In the case of a dual sideband In-Band-On-Channel (IBOC) signal typically used in conjunction with an FM carrier in the center, the sidebands can be interleaved to create a new IBOC signal definition and take the place of the FM carrier for an all-digital transmission that is backward compatible with IBOC receivers allowing for a gradual migration to all digital broadcasting.Type: GrantFiled: April 8, 2016Date of Patent: November 5, 2019Assignee: NAUTEL LIMITEDInventors: Philipp Schmid, Brian Walker
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Patent number: 9088467Abstract: A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.Type: GrantFiled: March 6, 2014Date of Patent: July 21, 2015Assignee: Nautel LimitedInventors: Brian Walker, Philipp Schmid
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Publication number: 20140185696Abstract: A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.Type: ApplicationFiled: March 6, 2014Publication date: July 3, 2014Applicant: NAUTEL LIMITEDInventors: Brian Walker, Philipp Schmid
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Publication number: 20130215946Abstract: A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.Type: ApplicationFiled: February 4, 2013Publication date: August 22, 2013Applicant: NAUTEL LIMITEDInventor: NAUTEL LIMITED
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Patent number: 8452245Abstract: A transmitter and method for determining impedance measurement in an active radio frequency transmitter of an antenna are provided. Voltage and current samples are obtained from a modulating signal delivered to an antenna. The voltage and current samples are converted from analog to digital format, and decimation occurs to reduce the number of samples. Complex demodulation is performed of each of the voltage and current samples to baseband levels and decimation of the voltage and current samples is performed to reduce the number of samples. An impedance estimate can then be estimated from the voltage and current samples.Type: GrantFiled: March 6, 2012Date of Patent: May 28, 2013Assignee: Nautel LimitedInventor: Brian Walker
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Patent number: 8369431Abstract: A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.Type: GrantFiled: January 25, 2008Date of Patent: February 5, 2013Assignee: Nautel LimitedInventors: Brian Walker, Philipp Schmid
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Publication number: 20120170632Abstract: A transmitter and method for determining impedance measurement in an active radio frequency transmitter of an antenna are provided. Voltage and current samples are obtained from a modulating signal delivered to an antenna. The voltage and current samples are converted from analog to digital format, and decimation occurs to reduce the number of samples. Complex demodulation is performed of each of the voltage and current samples to baseband levels and decimation of the voltage and current samples is performed to reduce the number of samples. An impedance estimate can then be estimated from the voltage and current samples.Type: ApplicationFiled: March 6, 2012Publication date: July 5, 2012Applicant: NAUTEL LIMITEDInventor: Brian Walker
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Patent number: 8213885Abstract: A transmitter and method for determining impedance measurement in an active radio frequency transmitter of an antenna are provided. Voltage and current samples are obtained from a modulating signal delivered to an antenna. The voltage and current samples are converted from analog to digital format, and decimation occurs to reduce the number of samples. Complex demodulation is performed of each of the voltage and current samples to baseband levels and decimation of the voltage and current samples is performed to reduce the number of samples. An impedance estimate can then be estimated from the voltage and current samples.Type: GrantFiled: April 9, 2009Date of Patent: July 3, 2012Assignee: Nautel LimitedInventor: Brian Walker
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Publication number: 20120161863Abstract: A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.Type: ApplicationFiled: March 6, 2012Publication date: June 28, 2012Applicant: NAUTEL LIMITEDInventors: Tim Hardy, Dennis Covill
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Patent number: 8208878Abstract: A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.Type: GrantFiled: March 6, 2012Date of Patent: June 26, 2012Assignee: Nautel LimitedInventors: Tim Hardy, Dennis Covill
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Patent number: 8140035Abstract: A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.Type: GrantFiled: May 21, 2009Date of Patent: March 20, 2012Assignee: Nautel LimitedInventors: Tim Hardy, Dennis Covill
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Patent number: 7970091Abstract: A method that uses time-domain processing on a spectrally efficient digital modulation scheme to reduce the bandwidth expansion in envelope elimination and restoration (EER) amplifiers is disclosed. The method identifies and localizes sections of the signal responsible for the out of band emissions, or spectral regrowth, using a filter. The detected sections are flagged and extended to allow for introduction of a lower frequency transition in place of the extended section, thus reducing spectral regrowth from the output of an EER amplifier. The method is particularly useful for improving the quality of digital AM radio transmission.Type: GrantFiled: November 30, 2007Date of Patent: June 28, 2011Assignee: Nautel LimitedInventor: Brian W. Walker
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Patent number: 7865610Abstract: A method and apparatus for improving the reliability in the synchronous streaming of data from a sender to multiple receivers, especially in networks having a limited bandwidth. The sender is configured to change the format of the data to be sent by segmenting the data into packets having maximum size, and identifying each packet with a message number. The transmit rate of the sender is adjusted according to the throughput bandwidth of the link so as to avoid congesting the link. Each receiver is configured to re-assemble the packets based upon the message number allocated to each packet, and re-create the data in the original format for being read by standard HDJ Radio Exciters. The Receivers may also be configured to keep track of the packet numbers and request re-transmission of lost packets, using the ARQ (Automatic Retransmission Request) scheme.Type: GrantFiled: March 12, 2007Date of Patent: January 4, 2011Assignee: Nautel LimitedInventors: Philipp Schmid, Scott Martin
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Publication number: 20100272221Abstract: A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.Type: ApplicationFiled: January 25, 2008Publication date: October 28, 2010Applicant: NAUTEL LIMITEDInventors: Brian Walker, Philipp Schmid
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Publication number: 20090289710Abstract: A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.Type: ApplicationFiled: May 21, 2009Publication date: November 26, 2009Applicant: NAUTEL LIMITEDInventors: Tim Hardy, Dennis Covill
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Publication number: 20090258614Abstract: A transmitter and method for determining impedance measurement in an active radio frequency transmitter of an antenna are provided. Voltage and current samples are obtained from a modulating signal delivered to an antenna. The voltage and current samples are converted from analog to digital format, and decimation occurs to reduce the number of samples. Complex demodulation is performed of each of the voltage and current samples to baseband levels and decimation of the voltage and current samples is performed to reduce the number of samples. An impedance estimate can then be estimated from the voltage and current samples.Type: ApplicationFiled: April 9, 2009Publication date: October 15, 2009Applicant: NAUTEL LIMITEDInventor: Brian Walker
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Patent number: 7107026Abstract: An automatic matching and tuning unit (AMTU), which connects the output from a low or medium frequency, high power radio transmitter, which requires a 50 ohm terminating impedance, to an antenna with an input impedance comprising low resistance in series with a high capacitive reactance. Sensors measure the phase angle between the input current and voltage. The inductance of a series connected loading coil is continuously varied to resonate the antenna capacitance. The resulting input resistance is transformed to 50 ohms using a matching transformer and pair of resonant, mutually coupled coils with adjustable mutual coupling. Sensors measure the input resistance and continuously adjust the mutual coupling coefficient to maintain the required 50 ohm input impedance. Sensors measure the antenna current and vary the transmitter power level to keep it constant. A microcontroller processes all of the sensor outputs and provides serial communication with the transmitter.Type: GrantFiled: February 12, 2004Date of Patent: September 12, 2006Assignee: Nautel LimitedInventor: John R. Pinks