Patents by Inventor Lars Sundström

Lars Sundström 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).

  • Patent number: 9264091
    Abstract: A mixer unit (30) for frequency translating, based on an LO signal, an input signal having one or more input signal components is disclosed. The mixer unit has a signal processing path (50a-d, 60a-d) from each Input terminal (32+, 32?) to each output terminal (34_I+, 34_I?, 34_Q+,34_Q?) of the mixer unit (30), The LO signal has an associated LO signal component (LO_Ia-d, LO_Qa-d) for each signal processing path. The mixer unit (30) comprises a plurality of mixer switches (70a-N) and a control unit (90). The control unit (90) is adapted to, for each signal processing path (50a-d, 60a-d), dynamically select an associated subset, in the following denoted active switch subset, of the plurality of mixer switches (70a-N) for operation in the signal processing path (50a-d, 60a˜d) such that which of the plurality of mixer switches (70a-N) belong to said active switch subset varies in time.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: February 16, 2016
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Martin Anderson, Henrik Sjöland, Lars Sundström, Jim Svensson
  • Publication number: 20150358910
    Abstract: A mobile communications terminal comprising a radio frequency interface configured to operate at least at a first configuration, and a controller, wherein said controller is configured to determine that a reconfiguration of the radio frequency interface is to be performed, determine a timing of the reconfiguration and reconfigure said radio frequency interface to operate at a second configuration at the determined timing, wherein said controller is configured to determine said timing based on the type of reconfiguration to be made.
    Type: Application
    Filed: January 9, 2014
    Publication date: December 10, 2015
    Inventors: Fredrik Tillman, Bengt Lindoff, Sven Mattisson, Johan Nilsson, Lars Sundström
  • Patent number: 9210026
    Abstract: A complex intermediate frequency mixer (IFM) for frequency translating a received complex intermediate frequency, IF, signal, wherein the received complex IF signal comprises at least two frequency bands located at upper-side and lower-side of 0 Hz, is provided. The complex intermediate frequency mixer comprises a first, second, third and fourth mixer (M1, M2, M3, M4). The complex intermediate frequency mixer further comprises a first, second, third and fourth gain adjusting component (?1, ?2, ?2, ?1), connected to a first, second, third and fourth mixer output (M1-out, M2-out, M3-out, M4-out), respectively. Moreover, a first summing unit (S1), connected to a first gain output (?1-out), a fourth gain output (?1-out) and a third mixer output (M3-out) negated, and second summing unit (S2), connected to the second gain output (?2-out), the third gain output (?2-out) and the fourth mixer output (M4-out), are configured to output a first baseband complex signal of the received complex IF signal.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: December 8, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sundström, Fenghao Mu, Leif Wilhelmsson
  • Patent number: 9210603
    Abstract: The present disclosure relates to a technique for performing physical layer measurements on a frequency resource relative to other frequency resources in a telecommunications system operable to communicate over multiple frequency resources.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: December 8, 2015
    Assignee: Optis Wireless Technology, LLC
    Inventors: Bengt Lindoff, Robert Baldemair, Lars Sundström
  • Patent number: 9148234
    Abstract: A test signal for determining a frequency-dependent or any other property of a receiver path is proposed. The test signal comprises, in a time domain representation, a sequence of discrete states that may be periodically repeated and that gives rise to a plurality of discrete tones in a frequency domain representation of the test signal. The test signal can be utilized for determining a frequency-dependent imbalance (e.g., an IQ imbalance) between different signal branches of a receiver or transmitter.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: September 29, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sundström, Jim Svensson, Leif Wilhelmsson
  • Publication number: 20150264583
    Abstract: Spatial sensor data, such as position, movement and rotation, which is provided by a sensor in a wireless communication device in a wireless communication system is used. By using the spatial sensor data it is possible to calculate predicted spatial data for use in controlling antenna beams for transmission as well as reception in the wireless communication system.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 17, 2015
    Inventors: Lars Sundström, Daniel Araújo, Dennis Hui, Andres Reial
  • Publication number: 20150249534
    Abstract: A radio transceiver is disclosed. It comprises a first transceiver circuit and a second transceiver circuit, the latter requiring an LO signal having higher LO frequency than the former. It further comprises a frequency synthesizer comprising a first clock-signal generator adapted to generate the LO signal for the first transceiver circuit based on a first reference oscillation signal and a second clock-signal generator adapted to generate the LO signal for the second transceiver circuit based on a second reference oscillation signal, which is or is derived from the LO signal for the first transceiver circuit. A radio communication apparatus comprising the radio transceiver is also disclosed.
    Type: Application
    Filed: October 2, 2013
    Publication date: September 3, 2015
    Inventors: Lars Sundstrom, Anders Wallen, Henrik Sjoland
  • Publication number: 20150249516
    Abstract: A radio transceiver circuit for FDD communication is disclosed. It comprises a transmitter for FDD signal transmission in a first frequency band, a first receiver for FDD signal reception in a second frequency band, separate from the first frequency band, and a duplexer. An output port of the transmitter is operatively connected to a first port of the duplexer for transmitting, through the duplexer, signals in said first frequency band. An input port of the first receiver is operatively connected to a second port of the duplexer for receiving, through the duplexer, signals in said second frequency band. The radio transceiver circuit comprises a second receiver, separate from the first receiver, for reception in said first frequency band. An input port of the second receiver is operatively connected to said first port of the duplexer for receiving, through the duplexer, signals in said first frequency band. A related radio communication apparatus is also disclosed.
    Type: Application
    Filed: October 2, 2013
    Publication date: September 3, 2015
    Applicant: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sundstrom, Sven Mattison, Anders Wallen
  • Patent number: 9118344
    Abstract: A continuous-time ??-ADC (1) is disclosed, comprising a sampled quantizer (5) arranged to generate samples y(n) of a digital output signal of the ??-ADC (1) at sample instants nT. The ??-ADC (1) further comprises two or more DACs (10a-b), each arranged to generate an analog feedback signal based on the samples of the digital output signal generated by the sampled quantizer (5), and a continuous-time analog network (20) arranged to generate an analog input signal to the quantizer (5) based on the feedback signal(s) from the two or more DACs (10a-b) and an analog input signal to the ??-ADC (1). At least a first DAC (10a) of the two or more DACs (10a-b) is adapted to generate a pulsed feedback signal that, for each n, comprises a pulse, the magnitude of which is proportional to the sample of the digital output signal at sample instant nT and which lasts between the time instants (n+a1)T and (?+?1)T, wherein 0<?1<?1<1.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: August 25, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Martin Anderson, Lars Sundström
  • Patent number: 9112450
    Abstract: A frequency translation filter 500 is configured to receive a radio frequency (RF) signal 501 comprising first and second non-contiguous carriers or non-contiguous frequency ranges. The frequency translation filter comprises a mixer 503 configured to mix the RF signal 501 received on a first input with a local oscillator (LO) signal 505 received on a second input. A filter 507 comprises a frequency dependent load impedance, the filter having band-pass characteristics which, when frequency translated using the mixer 503, contain first and second pass-bands corresponding to the first and second non-contiguous carriers or non-contiguous frequency ranges. The first and second pass-bands are centered about the local oscillator frequency.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: August 18, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sundström, Sven Mattisson
  • Publication number: 20150207659
    Abstract: A complex intermediate frequency mixer (IFM) for frequency translating a received complex intermediate frequency, IF, signal, wherein the received complex IF signal comprises at least two frequency bands located at upper-side and lower-side of 0 Hz, is provided. The complex intermediate frequency mixer comprises a first, second, third and fourth mixer (M1, M2, M3, M4). The complex intermediate frequency mixer further comprises a first, second, third and fourth gain adjusting component (?1, ?2, ?2, ?1), connected to a first, second, third and fourth mixer output (M1-out, M2-out, M3-out, M4-out), respectively. Moreover, a first summing unit (S1), connected to a first gain output (?1-out), a fourth gain output (?1-out) and a third mixer output (M3-out) negated, and second summing unit (S2), connected to the second gain output (?2-out), the third gain output (?2-out) and the fourth mixer output (M4-out), are configured to output a first baseband complex signal of the received complex IF signal.
    Type: Application
    Filed: March 30, 2015
    Publication date: July 23, 2015
    Inventors: Lars Sundström, Fenghao Mu, Leif Wilhelmsson
  • Patent number: 9088468
    Abstract: In a dual-carrier, double-conversion Orthogonal Frequency Division Multiplexing (OFDM) receiver a frequency synthesizer generates a first local oscillator signal for the first down-conversions stage of the receiver. A frequency divider is used to derive a second local oscillator signal from the first local oscillator signal, thus eliminating the need for a separate frequency synthesizer for the second down-conversion stage. A controller determines the frequency of the first local oscillator signal and a divisor M to align subcarrier grids for said first and second baseband signals with DC.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: July 21, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sundström, Magnus Nilsson, Leif Wilhelmsson
  • Patent number: 9065693
    Abstract: A radio circuit comprises an interface unit for communicating data and commands over a communication link between a digital baseband circuit and the radio circuit. Furthermore, the radio circuit comprises an event-scheduling unit, a local time-reference unit, a synchronization unit, and an execution-control unit. The event-scheduling unit is arranged to receive event-request commands specifying an event to be executed in the radio circuit and a time instant at which the specified event is to be executed, from the digital baseband circuit. Furthermore, the event-scheduling unit is arranged to, in response to receiving an event request-command, schedule the specified event to be executed on the specified time instant. The execution-control unit is arranged to issue execution of each scheduled event at the scheduled time instant based on time information from the local time reference unit.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: June 23, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (publ)
    Inventors: Thomas Olsson, Lars Sundstrom
  • Publication number: 20150139019
    Abstract: The present disclosure relates to a technique for performing physical layer measurements on a frequency resource relative to other frequency resources in a telecommunications system operable to communicate over multiple frequency resources.
    Type: Application
    Filed: January 26, 2015
    Publication date: May 21, 2015
    Inventors: Bengt LINDOFF, Robert Baldemair, Lars Sundström
  • Patent number: 9020077
    Abstract: A complex intermediate frequency mixer (IFM) for frequency translating a received complex intermediate frequency, IF, signal, wherein the received complex IF signal comprises at least two frequency bands located at upper-side and lower-side of 0 Hz, is provided. The complex intermediate frequency mixer comprises a first, second, third and fourth mixer (M1, M2, M3, M4). The complex intermediate frequency mixer further comprises a first, second, third and fourth gain adjusting component (?1, ?2, ?2, ?1), connected to a first, second, third and fourth mixer output (M1-out, M2-out, M3-out, M4-out), respectively. Moreover, a first summing unit (S1), connected to a first gain output (?1-out), a fourth gain output (?1-out) and a third mixer output (M3-out) negated, and second summing unit (S2), connected to the second gain output (?2-out), the third gain output (?2-out) and the fourth mixer output (M4-out), are configured to output a first baseband complex signal of the received complex IF signal.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: April 28, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Lars Sundström, Fenghao Mu, Leif Wilhelmsson
  • Publication number: 20150110161
    Abstract: A mixer unit (30) for frequency translating, based on an LO signal, an input signal having one or more input signal components is disclosed. The mixer unit has a signal processing path (50a-d, 60a-d) from each Input terminal (32+, 32?) to each output terminal (34_I+, 34_I?, 34_Q+,34_Q?) of the mixer unit (30), The LO signal has an associated LO signal component (LO_Ia-d, LO_Qa-d) for each signal processing path. The mixer unit (30) comprises a plurality of mixer switches (70a-N) and a control unit (90). The control unit (90) is adapted to, for each signal processing path (50a-d, 60a-d), dynamically select an associated subset, in the following denoted active switch subset, of the plurality of mixer switches (70a-N) for operation in the signal processing path (50a-d, 60a˜d) such that which of the plurality of mixer switches (70a-N) belong to said active switch subset varies in time.
    Type: Application
    Filed: September 14, 2012
    Publication date: April 23, 2015
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Martin Anderson, Henrik Sjöland, Lars Sundström, Jim Svensson
  • Patent number: 9007940
    Abstract: Levels of power reduction for signals to be transmitted from a mobile communications device via radio channels in a digital wireless communications system, where each signal is modulated according to one of a number of modulation configurations, are determined. For each modulation configuration a first estimate of a power reduction is calculated (101), and the calculated first estimates are storied (102) in the device. The method comprises the steps of determining (103) a limited set of modulation configurations, said limited set comprising modulation configurations that have been determined likely to be used in practice; calculating (104) for each modulation configuration of the limited set an optimized estimate of a power reduction; and storing (105) the calculated optimized estimates in the device. In this way the power consumption of the device is reduced while keeping a look-up table at a reasonable size.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: April 14, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Anders Wallén, Lars Sundström
  • Patent number: 8983471
    Abstract: The disclosure relates to a Complex Intermediate Frequency (CIF)-based receiver adapted to process a received signal comprising a signal component at a desired frequency and a signal component as an image frequency. The CIF-based receiver determines the power of the received signal by calibrating the receiver to minimize the power of the signal component at the image frequency that interferes with the signal component at the desired frequency, introduces signal leakage from the image frequency to intentionally degrade the quality of the signal component at the desired frequency, and determines the power of the signal component at the image frequency based on the amount of degradation.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: March 17, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Leif Wilhelmsson, Lars Sundstrom, Fenghao Mu
  • Publication number: 20150070071
    Abstract: It is disclosed a mixer arrangement for complex signal mixing comprising a first harmonic rejection mixer, and a second harmonic rejection mixer. Each of the harmonic rejection mixers comprises mixer unit cells wherein each mixer unit cell comprises a differential input, transconductance elements corresponding to the differential input, and a switching network arranged to switch signals from the transconductance elements to a differential output, and the first and the second harmonic rejection mixers have mutual quadrature phase relationship. The first and the second rejection mixer share a plurality of mixer unit cell, each comprising an input for receiving a signal to be mixed, an input for receiving control signals derived from a local oscillator signal, and one output for each of the first and second harmonic rejection mixers. A radio circuit comprising such a mixer arrangement and a communication apparatus comprising such a radio circuit are also disclosed.
    Type: Application
    Filed: April 3, 2013
    Publication date: March 12, 2015
    Applicant: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Martin Andersson, Lars Sundstrom
  • Publication number: 20150065198
    Abstract: A continuous-time ??-ADC (1) is disclosed. It comprises a sampled quantizer (5) arranged to generate samples y(n) of a digital output signal of the ??-ADC (1) at sample instants nT, where n is an integer sequence index and T is a sampling period, based on an analog input signal to the quantizer (5). Furthermore, the ??-ADC (1) comprises one or more DACs (10a-b), each arranged to generate an analog feedback signal based on the samples of the digital output signal generated by the sampled quantizer (5). Moreover, the ??-ADC (1) comprises a continuous-time analog network (20) arranged to generate the analog input signal to the quantizer (5) based on the feedback signal(s) from the one or more DACs (10a-b) and an analog input signal to the ??-ADC (1). At least one DAC (10b) of the one or more DACs (10b) comprises two switched-capacitor DACs (40, 50) arranged to operate on the same input but with a mutual delay in time.
    Type: Application
    Filed: October 11, 2012
    Publication date: March 5, 2015
    Inventors: Martin Anderson, Lars Sundström