Patents by Inventor Håkan Malmqvist
Håkan Malmqvist 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: 9385764Abstract: A digital pre-distortion arrangement is disclosed. The arrangement comprises a respective filter bank for each of two or more initial signals to be amplified simultaneously by a non-linear power amplifier, N combiners, N pre-distorters and a multiplexer. Each respective filter bank comprises N interrelated filters. Multiplexed impulse responses of the interrelated filters define an overall filter function comprising a pass band associated with a transmission frequency of the initial signal. Each respective filter bank is configured to filter the respective initial signal in each of the interrelated filters to produce N digital filtered signals. The initial signal and each of the digital filtered signals have sample rate R. Each of the combiners is configured to combine corresponding digital filtered signals of each of the two or more initial signals to produce a composite digital signal having sample rate R.Type: GrantFiled: December 13, 2012Date of Patent: July 5, 2016Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard Rexberg, Håkan Malmqvist
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Patent number: 9215120Abstract: Clipping a widely-separated, multi-carrier signal is effectively performed without having to use a high sampling speed. Clipping is performed in a first stage at a combined signal level, but with a predetermined carrier separation of at least twice the channel bandwidth (2CBW), followed by repositioning the carriers at baseband zero frequency. After clipping, carriers are placed at their respective center frequencies with full carrier separation reintroduced in a second stage. Iterative clipping stages smooth out signal reshaping and re-settled amplitudes for combined carriers.Type: GrantFiled: December 21, 2011Date of Patent: December 15, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Leonard Rexberg, Håkan Malmqvist
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Publication number: 20150318880Abstract: A digital pre-distortion arrangement is disclosed. The arrangement comprises a respective filter bank for each of two or more initial signals to be amplified simultaneously by a non-linear power amplifier, N combiners, N pre-distorters and a multiplexer. Each respective filter bank comprises N interrelated filters. Multiplexed impulse responses of the interrelated filters define an overall filter function comprising a pass band associated with a transmission frequency of the initial signal. Each respective filter bank is configured to filter the respective initial signal in each of the interrelated filters to produce N digital filtered signals. The initial signal and each of the digital filtered signals have sample rate R. Each of the combiners is configured to combine corresponding digital filtered signals of each of the two or more initial signals to produce a composite digital signal having sample rate R.Type: ApplicationFiled: December 13, 2012Publication date: November 5, 2015Inventors: Leonard Rexberg, Håkan Malmqvist
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Patent number: 8665141Abstract: Embodiments herein include a method for obtaining a calibration parameter for an antenna array. The antenna array comprises a first and a second radio module with respective associated antennas, wherein both radio modules comprise a main transmitter and a connected calibration receiver or both radio modules comprise a main receiver and a connected calibration transmitter. The method comprises: injecting a first calibration signal in the first radio module and measuring a first response to the first calibration in the first radio module. This injecting and measuring is repeated for all combinations of the first and second radio modules. Finally, a numerical value is calculated using the responses; a calibration parameter is calculated based on the calculated numerical value. Embodiments herein also include a corresponding antenna array, computer program and computer program product.Type: GrantFiled: March 7, 2013Date of Patent: March 4, 2014Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Håkan Malmqvist, Leonard Rexberg
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Publication number: 20130163512Abstract: Clipping a widely-separated, multi-carrier signal is effectively performed without having to use a high sampling speed. Clipping is performed in a first stage at a combined signal level, but with a predetermined carrier separation of at least twice the channel bandwidth (2CBW), followed by repositioning the carriers at baseband zero frequency. After clipping, carriers are placed at their respective center frequencies with full carrier separation reintroduced in a second stage. Iterative clipping stages smooth out signal reshaping and re-settled amplitudes for combined carriers.Type: ApplicationFiled: December 21, 2011Publication date: June 27, 2013Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard REXBERG, Håkan MALMQVIST
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Patent number: 8457192Abstract: A switch-modulator for a radio-frequency power amplifier, arranged to modulate the I-signal and the Q-signal of the complex components (I+j·Q) separately in an I-signal part and a Q-signal part in order to create a modulated I-signal pulse sequence and a modulated Q-signal pulse sequence, wherein the modulation comprises a time-shift of the pulse positions within a sample interval.Type: GrantFiled: December 18, 2006Date of Patent: June 4, 2013Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventor: Håkan Malmqvist
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Patent number: 8416126Abstract: Embodiments herein include a method for obtaining a calibration parameter for an antenna array. The antenna array comprises a first and a second radio module with respective associated antennas, wherein both radio modules comprise a main transmitter and a connected calibration receiver or both radio modules comprise a main receiver and a connected calibration transmitter. The method comprises: injecting a first calibration signal in the first radio module and measuring a first response to the first calibration in the first radio module. This injecting and measuring is repeated for all combinations of the first and second radio modules. Finally, a numerical value is calculated using the responses; a calibration parameter is calculated based on the calculated numerical value. Embodiments herein also include a corresponding antenna array, computer program and computer program product.Type: GrantFiled: December 1, 2010Date of Patent: April 9, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Håkan Malmqvist, Leonard Rexberg
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Publication number: 20120139776Abstract: Embodiments herein include a method for obtaining a calibration parameter for an antenna array. The antenna array comprises a first and a second radio module with respective associated antennas, wherein both radio modules comprise a main transmitter and a connected calibration receiver or both radio modules comprise a main receiver and a connected calibration transmitter. The method comprises: injecting a first calibration signal in the first radio module and measuring a first response to the first calibration in the first radio module. This injecting and measuring is repeated for all combinations of the first and second radio modules. Finally, a numerical value is calculated using the responses; a calibration parameter is calculated based on the calculated numerical value. Embodiments herein also include a corresponding antenna array, computer program and computer program product.Type: ApplicationFiled: December 1, 2010Publication date: June 7, 2012Inventors: Håkan Malmqvist, Leonard Rexberg
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Patent number: 7932790Abstract: Switch-modulation of a radio-frequency power amplifier by-representing the input signal by the I-signal (1) and Q-signal (9) of the complex components (I+j?Q), and pulse width modulating the I-signal and the Q-signal separately to create a modulated I-signal pulse sequence (3a) and a modulated Q-signal pulse sequence (3b). Further, the pulses corresponding to negative sample values are time-shifted relative the pulses corresponding to positive sample values, and each pulse of the I-signal pulse sequence is delayed by introducing a delaying time shift.Type: GrantFiled: October 27, 2006Date of Patent: April 26, 2011Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard Rexberg, Håkan Malmqvist, Thomas Lejon
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Publication number: 20100097153Abstract: Switch-modulation of a radio-frequency power amplifier by-representing the input signal by the I-signal (1) and Q-signal (9) of the complex components (I+j?Q), and pulse width modulating the I-signal and the Q-signal separately to create a modulated I-signal pulse sequence (3a) and a modulated Q-signal pulse sequence (3b). Further, the pulses corresponding to negative sample values are time-shifted relative the pulses corresponding to positive sample values, and each pulse of the I-signal pulse sequence is delayed by introducing a delaying time shift.Type: ApplicationFiled: October 27, 2006Publication date: April 22, 2010Inventors: Leonard Rexberg, Håkan Malmqvist, Thomas Lejon
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Publication number: 20100014575Abstract: A switch-modulator (15) for a radio-frequency power amplifier, arranged to modulate the I-signal and the Q-signal of the complex components (I+j.Q) separately in an I-signal part (2a) and a Q-signal part (2b) in order to create a modulated I-signal pulse sequence and a modulated Q-signal pulse sequence, said modulation comprising a time-shift of the pulse positions within a sample interval.Type: ApplicationFiled: December 18, 2006Publication date: January 21, 2010Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventor: Håkan Malmqvist