Patents by Inventor Spendim Dalipi
Spendim Dalipi 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: 20230179252Abstract: There is provided mechanisms for PIM removal in an antenna system. A method is performed by a controller of the antenna system. The method comprises identifying, during transmission using codebook based beamforming, which transmission radio chains of the antenna system that cause a signal received by receiver radio chains of the antenna system to be impacted by PIM. These transmission radio chains are identified based on which codeword in the codebook is used for the beamforming. The method comprises determining a correction signal by subjecting the signals only as transmitted by the identified transmission radio chains to a model of the PIM. The method comprises removing PIM from the signal received by the receiver radio chains by subtracting the correction signal from the signal received by the receiver radio chains.Type: ApplicationFiled: March 18, 2020Publication date: June 8, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Jin ELLGARDT, Spendim DALIPI, Mats Gan KLINGBERG, Haiying CAO
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Publication number: 20220182087Abstract: Systems and methods for handling cancellation of a Passive Intermodulation (PIM) signal are provided. The network device has access to and controls one or more transmitters and one or more receivers. The network device applies a determined PIM model to a transmitted signal from each transmitter of the network device, to obtain a modelled signal. The PIM model comprises a forward path model for each transmitter to the PIM source, a common non-linear model of the PIM signal from the PIM source being applied to a combined signal comprising the signals from each transmitter modelled by the forward path model, and a linear reflective path model from the PIM source to each of the receivers of the network device for a received PIM signal. The network device further subtracts the modelled signal from a received signal on each of the receivers of the network device.Type: ApplicationFiled: April 1, 2019Publication date: June 9, 2022Inventors: Jin Ellgardt, Jim Svensson, Spendim Dalipi
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Patent number: 10892788Abstract: A method and a transmitter arrangement for cancelling cross talk and correcting power amplifier (PA) distortion for a transmitter branch of a multiple-input multiple-output (MIMO) configuration having multiple branches. The method comprises combining an original baseband input signal of a first MIMO transmitter branch with a crosstalk output signal generated from two or more signals associated with two or more respective MIMO branches, the two or more signals used as input to, and processed by, a crosstalk model. The method further comprises processing the combined signal to generate an output signal in order to minimize the error of the original baseband input signal caused by the crosstalk and/or PA distortion.Type: GrantFiled: April 7, 2017Date of Patent: January 12, 2021Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Haiying Cao, Spendim Dalipi, Per Landin
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Patent number: 10750504Abstract: A wideband carrier (e.g., LTE carrier) is shifted up or down in frequency, within an allocated frequency band, by an integer multiple of the channel raster spacing (e.g., 100 KHz). This reduces the size of the guard band on one side of the carrier, and expands the guard band on the other side. A narrowband carrier (e.g., NB-IoT carrier) is then deployed within the expanded guard band, at or near a frequency such that the transmission is orthogonal to the wideband carrier transmissions, such as by using a shared N frequency grid spacing (e.g. at 100 KHz spacing, and using 15 KHz subcarriers). The narrowband carrier thus maintains orthogonality with the wideband carrier, but has “room” within the expanded guard band to both transmit on a frequency close to the frequency grid spacing, and to boost transmit power (e.g., by 6 dB), while remaining within the spectral mask. The shifted wideband carrier is transparent to wideband UEs, as the frequency shift is an integer multiple of the channel raster spacing.Type: GrantFiled: February 6, 2017Date of Patent: August 18, 2020Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Spendim Dalipi, Dominique Everaere, Asbjörn Grövlen, Kenneth Sandberg, Yutao Sui, Yi-Pin Eric Wang
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Publication number: 20200059256Abstract: A method and a transmitter arrangement for cancelling cross talk and correcting power amplifier (PA) distortion for a transmitter branch of a multiple-input multiple-output (MIMO) configuration having multiple branches. The method comprises combining an original baseband input signal of a first MIMO transmitter branch with a crosstalk output signal generated from two or more signals associated with two or more respective MIMO branches, the two or more signals used as input to, and processed by, a crosstalk model. The method further comprises processing the combined signal to generate an output signal in order to minimize the error of the original baseband input signal caused by the crosstalk and/or PA distortion.Type: ApplicationFiled: April 7, 2017Publication date: February 20, 2020Inventors: Haiying Cao, Spendim Dalipi, Per Landin
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Publication number: 20190141705Abstract: A wideband carrier (e.g., LTE carrier) is shifted up or down in frequency, within an allocated frequency band, by an integer multiple of the channel raster spacing (e.g., 100 KHz). This reduces the size of the guard band on one side of the carrier, and expands the guard band on the other side. A narrowband carrier (e.g., NB-IoT carrier) is then deployed within the expanded guard band, at or near a frequency such that the transmission is orthogonal to the wideband carrier transmissions, such as by using a shared N frequency grid spacing (e.g. at 100 KHz spacing, and using 15 KHz subcarriers). The narrowband carrier thus maintains orthogonality with the wideband carrier, but has “room” within the expanded guard band to both transmit on a frequency close to the frequency grid spacing, and to boost transmit power (e.g., by 6 dB), while remaining within the spectral mask. The shifted wideband carrier is transparent to wideband UEs, as the frequency shift is an integer multiple of the channel raster spacing.Type: ApplicationFiled: February 6, 2017Publication date: May 9, 2019Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Spendim DALIPI, Dominique EVERAERE, Asbjörn GRÖVLEN, Kenneth SANDBERG, Yutao SUI, Yi-Pin Eric WANG
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Patent number: 9960805Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: GrantFiled: June 24, 2016Date of Patent: May 1, 2018Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Patent number: 9735811Abstract: A method and apparatus for compensating for nonlinearities in a non-linear device for manipulating a signal is described. Shortly before an initial discrete power increase is applied to the device, a first pre-distortion function is generated on the basis of a first set of DPD parameters and applied to the signal before it reaches the device. A predetermined time period after the initial power increase, the first pre-distortion function stops being applied to the signal, and a second pre-distortion function is generated on the basis of a second set of DPD parameters and applied to the signal. Shortly before a subsequent discrete power increase is applied to the device, the first pre-distortion function is generated on the basis of the first set of DPD parameters and applied to the signal.Type: GrantFiled: November 22, 2010Date of Patent: August 15, 2017Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Spendim Dalipi, Stefan Hamrin, Tobias Johansson
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Patent number: 9509365Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: GrantFiled: June 2, 2015Date of Patent: November 29, 2016Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Publication number: 20160308562Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: ApplicationFiled: June 24, 2016Publication date: October 20, 2016Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Patent number: 9473200Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: GrantFiled: June 2, 2015Date of Patent: October 18, 2016Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Publication number: 20150263782Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: ApplicationFiled: June 2, 2015Publication date: September 17, 2015Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Patent number: 9077440Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: GrantFiled: July 1, 2013Date of Patent: July 7, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Patent number: 8903336Abstract: A method for compensating signal distortions in multiple transmitting branches entering a composite amplifier.Type: GrantFiled: May 13, 2013Date of Patent: December 2, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Tony Fonden, Richard Hellberg, Mats Klingberg, Spendim Dalipi
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Publication number: 20140194073Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, a transmitter is configured to upconvert and amplify a digital transmit signal to provide an analog radio frequency transmit signal at an output of the transmitter that includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. The main receiver is configured to amplify, downconvert, and digitize an analog radio frequency receive signal to provide a digital receive signal. The digital feedforward transmit noise cancellation subsystem is configured to process the digital transmit signal to generate a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band and is subtracted from the digital receive signal to thereby provide a compensated digital receive signal.Type: ApplicationFiled: July 1, 2013Publication date: July 10, 2014Inventors: Mark Wyville, Lars Johan Thorebäck, Spendim Dalipi
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Patent number: 8626090Abstract: A radio frequency transmitter comprises an amplifier, an antenna port, an isolator adapted to isolate an output of the amplifier from an interfering signal of the antenna port, a linearization loop and a transmission line comprising a first part (coupling a signal source to an input of the amplifier), a second part (coupling the output of the amplifier to an input of the isolator) and a third part (coupling an output of the isolator to the antenna port). The linearization loop is adapted to reduce non-linearity of the isolator and comprises a first directional coupler coupled to the third part of the transmission line, a loop impedance, and at least one further linearization loop element adapted to adjust a linearization signal and to feed the adjusted linearization signal to the transmission line. The radio frequency transmitter also comprises an interference reducing circuit adapted to reduce an influence of the interfering signal on the linearization loop.Type: GrantFiled: March 23, 2010Date of Patent: January 7, 2014Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Spendim Dalipi
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Publication number: 20130321075Abstract: A method for compensating signal distortions in multiple transmitting branches entering a composite amplifier.Type: ApplicationFiled: May 13, 2013Publication date: December 5, 2013Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: Tony Fonden, Richard Hellberg, Mats Klingberg, Spendim Dalipi
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Publication number: 20130243119Abstract: A method and apparatus for compensating for nonlinearities in a non-linear device for manipulating a signal is described. Shortly before an initial discrete power increase is applied to the device, a first pre-distortion function is generated on the basis of a first set of DPD parameters and applied to the signal before it reaches the device. A predetermined time period after the initial power increase, the first pre-distortion function stops being applied to the signal, and a second pre-distortion function is generated on the basis of a second set of DPD parameters and applied to the signal. Shortly before a subsequent discrete power increase is applied to the device, the first pre-distortion function is generated on the basis of the first set of DPD parameters and applied to the signal.Type: ApplicationFiled: November 22, 2010Publication date: September 19, 2013Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Spendim Dalipi, Stefan Hamrin, Tobias Johansson
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Patent number: 8442460Abstract: A method for compensating signal distortions in multiple transmitting branches (3, 5; 43, 45, 46) entering a composite amplifier (1; 1?). According to the invention the method comprises the steps of: —providing (S1) one or more input signals (x) to the composite amplifier. —observing (S2) an output signal (z) from the composite amplifier (1; 1?) for each provided input signal; —deriving (S5) an error in each output signal (z) by comparing the output signal with an ideal output signal, said error being caused by said signal distortions; —deriving (S11) the individual contribution from each transmitting branch (3, 5; 43,45,46) to the error by utilizing a composite amplifier model, said composite amplifier model comprising information about the contribution from each constituent amplifier (23, 25; 103a,103b,103c) to the output signal for each provided input signal: —compensating the signal distortions in the transmitting branches (3, 5; 43,45,46) accordingly.Type: GrantFiled: April 10, 2006Date of Patent: May 14, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Tony Fonden, Richard Hellberg, Mats Klingberg, Spendim Dalipi
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Publication number: 20130005284Abstract: A radio frequency transmitter comprises an amplifier, an antenna port, an isolator adapted to isolate an output of the amplifier from an interfering signal of the antenna port, a linearization loop and a transmission line comprising a first part (coupling a signal source to an input of the amplifier), a second part (coupling the output of the amplifier to an input of the isolator) and a third part (coupling an output of the isolator to the antenna port). The linearization loop is adapted to reduce non-linearity of the isolator and comprises a first directional coupler coupled to the third part of the transmission line, a loop impedance, and at least one further linearization loop element adapted to adjust a linearization signal and to feed the adjusted linearization signal to the transmission line. The radio frequency transmitter also comprises an interference reducing circuit adapted to reduce an influence of the interfering signal on the linearization loop.Type: ApplicationFiled: March 23, 2010Publication date: January 3, 2013Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventor: Spendim Dalipi