Patents by Inventor Per-Erik Eriksson

Per-Erik Eriksson 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).

  • Publication number: 20170311379
    Abstract: It is provided a splitter device comprising: a first trunk cable interface for connecting with a first aggregation node via a first trunk cable; a first radio head interface for connecting to a first remote radio head via a first distribution cable; a second radio head interface for connecting to a second remote radio head via a second distribution cable; a signal combiner and splitter connected to the first radio head interface and the second radio head interface; and a radio signal refresh unit provided between the first trunk cable interface and the signal combiner and splitter. The radio head interfaces comprise respective gain control units and uplink signal amplifiers, wherein a gain of the uplink signal amplifiers is adjusted based on a signal from the respective gain control unit.
    Type: Application
    Filed: September 1, 2014
    Publication date: October 26, 2017
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Elmar TROJER, Miguel BERG, Per-Erik ERIKSSON, Chenguang LU
  • Patent number: 9800720
    Abstract: Systems and methods for determining non-linear precoding coefficients are disclosed. In some embodiments, a method of determining non-linear precoding coefficients for transmitting at least one frequency tone on lines includes obtaining a channel matrix that relates an input of the lines to an output of the lines for the at least one frequency tone. The method also includes computing a metric for each line in a subset of the lines and determining a line order for the subset of the lines based on the metric for each line in the subset of the lines. The method also includes reordering elements of the channel matrix based on the line order for the subset of the lines to create a reordered channel matrix and determining the non-linear precoding coefficients based on the reordered channel matrix. This may provide a systematic way to sort lines and balance the bit rates between different lines.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: October 24, 2017
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Chenguang Lu, Per-Erik Eriksson, Aldebaro Klautau, Francisco Müller, Keke Zu
  • Patent number: 9780830
    Abstract: A device for limiting crosstalk between vectoring modems connected to a group of communication lines comprises a subgroup determining element that obtains information of the division into subgroups, each subgroup being made up of lines experiencing cross-talk from each other, and assigns operational pilot sequences to the group according to the division, an operational sequence transmission control element that transmits the operational sequences on the lines to the modems, which sequences are mutually orthogonal to each other and each communication line receives a corresponding sequence, and a corrective action determining element that obtains cross-talk measurements related to the transmitted operational pilot sequences and determines, for each subgroup, cross-talk and corrective action based on measurements made for a number of sequence symbols, which number corresponds to the minimum number required for obtaining mutually orthogonal pilot sequences within the subgroup.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: October 3, 2017
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Chenguang Lu, Per-Erik Eriksson
  • Patent number: 9780989
    Abstract: There is provided spectrum shaping of a signal. A frequency-domain representation of the signal to be spectrum-shaped is provided. The signal is associated with a set of constellation points having a minimum distance. A spectrum-shaped signal is determined by altering a proper subset of the constellation points while maintaining the minimum distance between all of the constellation points. The spectrum-shaped signal is transformed into a time-domain signal.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: October 3, 2017
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Elmar Trojer, Miguel Berg, Per-Erik Eriksson, Chenguang Lu, Thomas Magesacher
  • Publication number: 20170250731
    Abstract: Vector Control Entity and method therein for Disorderly Leaving Events, DLEs, causing Sudden Termination Change in a DSL system. The method comprises, when a DLE occurs on a line m in a vectored group of DSL lines, and the transmission on line m is, at least partly, continued: obtaining at least one error sample from CPEs connected to other lines in the vectored group of DSL lines, and calculating an estimate of the channel coefficients, H?, changed due to the DLE. The estimate is calculated based on the at least one error sample, and thus a channel estimate is provided. The method further comprises modifying a downstream precoder, based on the channel estimate, such that retraining of the other lines in the vectored group due to the DLE is avoided. The estimate of the channel coefficients is calculated based on the model H?=H+C?H.
    Type: Application
    Filed: September 30, 2014
    Publication date: August 31, 2017
    Applicant: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Eduardo Lins De Medeiros, Per-Erik Eriksson, Yezi Huang, Chenguang Lu, Thomas Magesacher
  • Publication number: 20170245228
    Abstract: A method (100, 200) in a synchronisation control unit is disclosed. The method enables synchronisation of a plurality of distributed devices with a network and comprises the steps of receiving a wireless synchronisation signal from a network node over a wireless channel (104, 204) and processing the received synchronisation signal (108, 208). The method further comprises transmitting the processed synchronisation signal to the plurality of distributed devices over a local connection which is different to the wireless channel over which the wireless synchronisation channel is received (120, 220). Also disclosed are a synchronisation control unit (300, 400) and a computer program product.
    Type: Application
    Filed: August 14, 2014
    Publication date: August 24, 2017
    Inventors: Stefano Ruffini, Per-Erik Eriksson, Zere Ghebretensaé, Ioanna Pappa
  • Publication number: 20170223771
    Abstract: Disclosed is a method performed by a base station system of a wireless communication network, for increasing signal quality of signals sent from a radio head (RH) to a radio unit (RU) over a metallic conductor. The base station system comprising a baseband unit (BBU), the RU and the RH and the RU is connected to the RH via the metallic conductor. The method comprises, at the RH: amplifying, by an amplification unit, a signal to be transmitted from the RH to the RU; changing the signal amplification level of the amplification unit; and transmitting the amplified signal to the RU. The method further comprises, at the RU: receiving the amplified signal and compensating, by a compensating unit capable of adapting its amplification level, for the change in signal amplification level performed at the RH such that the strength of the signal is transparent to the base station system.
    Type: Application
    Filed: April 13, 2017
    Publication date: August 3, 2017
    Inventors: Miguel BERG, Per-Erik ERIKSSON, Chenguang LU, Peter PÄÄKKÖNEN, Elmar TROJER
  • Patent number: 9686651
    Abstract: It is presented a method for assisting the determining of a position of a wireless device, the method being performed in a network node connected to a plurality of remote radio head devices via a combiner. The method comprises the steps of: receiving an uplink signal via the combiner; comparing a carrier frequency of the uplink signal with a set of manipulation schemes for a carrier frequency of uplink signals, wherein the manipulation schemes are different for at least some of the plurality of remote radio head devices; and providing a proximity indication that the position of the wireless device is in the vicinity of a remote radio head device the frequency manipulation scheme of which best matches the uplink signal. A corresponding network node, computer program, and computer program product are also presented.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: June 20, 2017
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Elmar Trojer, Miguel Berg, Per-Erik Eriksson, Fredrik Gunnarsson, Chenguang Lu, Jacob Osterling
  • Patent number: 9667464
    Abstract: The present disclosure relates to a Time Duplex Division (TDD) modem and a method in such a modem for making Single Ended Line Test (SELT) measurements. The device comprises a transmitter and a receiver and it has a normal mode of TDD communication. In these devices, Time Domain Reflectometry (TDR) is used as line measurement. It has a number of drawbacks, and for overcoming said drawbacks, Frequency Domain Reflectometry (FDR) measurement techniques adapted for TDD devices are suggested.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: May 30, 2017
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per-Erik Eriksson, Miguel Berg, Daniel Cederholm, Klas Ericson, Chenguang Lu
  • Patent number: 9661686
    Abstract: Disclosed is a method performed by a base station system of a wireless communication network, for increasing signal quality of signals sent from a radio head (RH) to a radio unit (RU) over a metallic conductor. The base station system comprising a baseband unit (BBU), the RU, and the RH, and the RU is connected to the RH via the metallic conductor. The method comprises, at the RH: amplifying, by an amplification unit, a signal to be transmitted from the RH to the RU; changing the signal amplification level of the amplification unit; and transmitting the amplified signal to the RU. The method further comprises, at the RU: receiving the amplified signal and compensating, by a compensating unit capable of adapting its amplification level, for the change in signal amplification level performed at the RH such that the strength of the signal is transparent to the base station system.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: May 23, 2017
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Miguel Berg, Per-Erik Eriksson, Chenguang Lu, Peter Pääkkönen, Elmar Trojer
  • Patent number: 9660694
    Abstract: Disclosed is a method performed by a radio unit (10) operable in a base station system of a wireless communication network, for reducing interference at the RU. The base station system comprises a baseband unit (30) the radio unit (10) and a plurality of radio heads (21-26) wherein the radio unit is connected to the plurality of radio heads via a number of metallic conductors (40), and wherein a signal is to be communicated to the radio unit at a first frequency range over one of the number of metallic conductors from one of the plurality of radio heads.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: May 23, 2017
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Per-Erik Eriksson, Miguel Berg, Chenguang Lu, Elmar Trojer
  • Publication number: 20170125902
    Abstract: It is presented a hybrid coil circuit comprising: a transformer; a common mode choke, wherein all choke windings are magnetically coupled; an impedance matching device connected on a middle choke winding, the impedance matching device being connected to ground; a first port being provided between a first choke winding and the impedance matching device; a second port being provided between a third choke winding and the impedance matching device; a third port being provided between either end of a second transformer winding; a first inductor arranged between the impedance matching device and the first port; and a second inductor arranged between the impedance matching device and the second port, wherein the first inductor and the second inductor are magnetically coupled.
    Type: Application
    Filed: July 1, 2014
    Publication date: May 4, 2017
    Inventors: Elmar TROJER, Per-Erik ERIKSSON, Chenguang LU, Lukas SANDSTRÖM, Miguel BERG
  • Publication number: 20170034604
    Abstract: A central node for digital subscriber line access multiplex.
    Type: Application
    Filed: April 11, 2014
    Publication date: February 2, 2017
    Inventors: Per-Erik ERIKSSON, Miguel BERG, Chenguang LU, Elmar TROJER
  • Publication number: 20170033842
    Abstract: It is presented a method for determining a position of a wireless device, the method being performed in a network node connected to a plurality of remote radio head devices each comprising a first antenna device which can be used for a first MIMO, multiple input multiple output, stream and a second antenna device which can be used for a second MIMO stream. The method comprises the steps of: sending a first cell identifier for transmission on both the first antenna device and the second antenna device of each one of the remote radio head devices; sending a second cell identifier, for transmission on an antenna device of only a specific remote radio head device; receiving a measurement report from the wireless device associated with the second cell identifier; and determining a position of the wireless device based on the received measurement report.
    Type: Application
    Filed: December 23, 2013
    Publication date: February 2, 2017
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chenguang Lu, Miguel Berg, Elmar Trojer, Per-Erik Eriksson
  • Patent number: 9531866
    Abstract: There is provided mitigation of disconnect events in a vectoring based digital subscriber line, DSL, system. A method performed by a digital subscriber line access multiplexer, DSLAM, comprises detecting a loss of signal or disconnect event of a line in a vectored group of DSL lines, the loss of signal or disconnect event causing a negative impact on the DSL system. The method further comprises detecting a change in at least one downstream, DS, crosstalk coefficient of at least one line in said vectored group of DSL lines. The method further comprises determining a magnitude of said change. The method further comprises determining where the loss of signal or disconnect event has occurred by processing precoding coefficients of the vectored group of DSL lines. The method further comprises determining, on basis of the determined magnitude and where the loss of signal or disconnect event has occurred, an action to be performed by the DSLAM so as to mitigate for said negative impact.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: December 27, 2016
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Chenguang Lu, Tomas Andreason, Miguel Berg, Per-Erik Eriksson, Elmar Trojer
  • Patent number: 9509605
    Abstract: A method is provided performed by an access point for handling uplink communication in a communication system comprising the access point and a wire line network node connected via wire line to the access point. The method comprises receiving an encrypted and/or integrity protected packet data unit, PDU, from a user equipment (UE) wirelessly connected to the access point and detecting type of the received PDU, the type of PDU being any of a signaling radio bearer type or a data radio bearer type. The method further comprises encapsulating the received PDU by setting a header to the PDU, which header comprises an identity indicating the detected type of PDU and an identity indicating a source address and/or a destination address of the PDU, and sending the encapsulated PDU to the wire line network node. Provided is also a corresponding method performed in the wire line network node.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: November 29, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Kim Laraqui, Henrik Almeida, Per-Erik Eriksson, Chenguang Lu
  • Patent number: 9439101
    Abstract: Presented are methods and arrangements for adapting the load in a cell based on information on upcoming events related to a backhaul link. The upcoming events related to the backhaul link may be delayed in order to give enough time for an RBS to complete activities related to the load adaptation. Thus, UEs may be handed over to neighboring cells proactively, before the cell becomes overloaded due to events related to the backhaul link.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: September 6, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Per-Erik Eriksson, Miguel Berg, Chenguang Lu, Elmar Trojer
  • Publication number: 20160249370
    Abstract: A first network node of a cellular system is configured for communication with a second network node over a twisted pair wire. The first network node includes a receiver for receiving, over the twisted pair wire, an intermediate frequency signal from the second network node, which intermediate frequency signal has been converted from a high frequency signal having a frequency higher than the frequency of the intermediate frequency signal by the second network node, and a down-converter for converting the intermediate frequency signal to a low frequency signal having a frequency lower than the frequency of the intermediate frequency signal. The first network node also includes an up-converter for converting a received low frequency signal to an intermediate frequency signal having a frequency higher than the frequency of the low frequency signal.
    Type: Application
    Filed: May 2, 2016
    Publication date: August 25, 2016
    Inventors: Chenguang Lu, Elmar Trojer, Jacob Osterling, Miguel Berg, Per-Erik Eriksson, Ralf Bergqvist
  • Patent number: 9425983
    Abstract: The invention relates to an interconnecting node for use in interconnecting a passive optical network (PON) and a copper wire xDSL access network, wherein said interconnecting node comprises an optical network unit (ONU) arranged to be connected to an optical line termination (OLT) over the PON network; and at least one xDSL access device connectable to at least one user end xDSL equipment over the copper wire xDSL access network. The interconnecting node is characterized in that it further comprises a clocking interconnect between the ONU unit and the at least one xDSL access device arranged to distribute a clock signal obtained from optical network transmissions received in the ONU unit over the PON network to an timing reference input of the at least one xDSL access device. The invention also relates to a further interconnecting node, methods for use in interconnecting nodes, a central office optical network apparatus and an access network.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: August 23, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Elmar Trojer, Per-Erik Eriksson
  • Publication number: 20160226555
    Abstract: Disclosed is a method performed by a radio unit (10) operable in a base station system of a wireless communication network, for reducing interference at the RU. The base station system comprises a baseband unit (30) the radio unit (10) and a plurality of radio heads (21-26) wherein the radio unit is connected to the plurality of radio heads via a number of metallic conductors (40), and wherein a signal is to be communicated to the radio unit at a first frequency range over one of the number of metallic conductors from one of the plurality of radio heads.
    Type: Application
    Filed: July 3, 2013
    Publication date: August 4, 2016
    Inventors: Per-Erik Eriksson, Miguel Berg, Chenguang Lu, Elmar Trojer