Patents by Inventor Per Odling
Per Odling 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: 8848811Abstract: The present invention relates to a precoder for a communication system arranged to provide transmission blocks for transmission over a transmission channel based on inputted symbol blocks. The precoder is arranged to pre-distort each symbol block based on an estimate of the characteristics of the transmission channel so that the corresponding transmission block appears to be undistorted after transmission over the transmission channel. In accordance therewith, the precoder is arranged to apply Tomlinson-Harashima precoding on a sum of a first measure corresponding to predistortion so as to remove intrasymbol interference and a second measure corresponding to predistortion so as to remove intersymbol interference. The present invention further relates to a method for providing transmission blocks for transmission over a transmission channel in a communication system.Type: GrantFiled: August 20, 2008Date of Patent: September 30, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Jaume Rius I Riu, Thomas Magesacher, Per Ödling
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Patent number: 8290122Abstract: A method and device for estimating one or more transmission properties of a telecommunication transmission line. At least one signal is sent on the line, the at least one signal including at least two frequencies for which the absolute value of the line propagation constant times the line length is less than ?, and a resulting signal is received. An estimate of at least one transmission line property is then determined by examining the relationship between the sent and resulting signal or signals. The process may be repeated, if necessary. The estimate determination may also be repeated one or more times, with each successive estimate preferably using for the determination only those frequencies for which, as previously estimated, the absolute value of the line propagation constant times the line length is less than ?.Type: GrantFiled: October 27, 2005Date of Patent: October 16, 2012Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefan Allevad, Per Ödling, Antoni Fertner, Henrik Back, Fredrik Lindqvist, Per Ola Börjesson, Jaume Rius i Riu
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Publication number: 20110305267Abstract: The present invention relates to a precoder for a communication system arranged to provide transmission blocks for transmission over a transmission channel based on inputted symbol blocks. The precoder is arranged to pre-distort each symbol block based on an estimate of the characteristics of the transmission channel so that the corresponding transmission block appears to be undistorted after transmission over the transmission channel. In accordance therewith, the precoder is arranged to apply Tomlinson-Harashima precoding on a sum of a first measure corresponding to predistortion so as to remove intrasymbol interference and a second measure corresponding to predistortion so as to remove intersymbol interference. The present invention further relates to a method for providing transmission blocks for transmission over a transmission channel in a communication system.Type: ApplicationFiled: August 20, 2008Publication date: December 15, 2011Inventors: Jaume Rius I Riu, Thomas Magesacher, Per Ödling
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Publication number: 20090213998Abstract: A method and device for estimating one or more transmission properties of a telecommunication transmission line. At least one signal is sent on the line, the at least one signal including at least two frequencies for which the absolute value of the line propagation constant times the line length is less than ?, and a resulting signal is received. An estimate of at least one transmission line property is then determined by examining the relationship between the sent and resulting signal or signals. The process may be repeated, if necessary. The estimate determination may also be repeated one or more times, with each successive estimate preferably using for the determination only those frequencies for which, as previously estimated, the absolute value of the line propagation constant times the line length is less than ?.Type: ApplicationFiled: October 27, 2005Publication date: August 27, 2009Inventors: Stefan Allevad, Per Odling, Antoni Fertner, Henrik Back, Fredrik Lindqvist, Per Ola Borjesson, Jaume Rius i Riu
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Patent number: 7483401Abstract: A method and arrangement in a communication system for dynamically allocating communication system frequency spectrum after cross-talk interface between transmission medias used for upstream and downstream communication in the frequency spectrum. After detecting cross-talk interface on a disturbed transmission medium caused by transmission on a disturbing transmission medium, the arrangement transmit a media control signal on the disturbed transmission medium and detects a reproduced media control signal that is reproduced due to cross-talk on the disturbing transmission medium. The disturbed or disturbing transmission media can then be dynamically allocated different frequency spectrum to eliminate the interface. In one embodiment, each transmission medium has a default transmission direction, and if one of the transmission is in a direction opposite the default direction, that transmission is reassigned to another transmission medium.Type: GrantFiled: November 21, 2001Date of Patent: January 27, 2009Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Per Håkan Albin Johansson, Per Ödling, Pål Frenger, Björn Olof Bohlin
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Patent number: 7113549Abstract: Zipper is the time-synchronized frequency-division duplex implementation of discrete multi-tome (DMT) modulation. Two communicating Zipper modems transmit DMT symbols simultaneously with a common clock. When all transmitters are time synchronized, the near end cross-talk (NEXT) and near end echoes injected into the received signal are orthogonal to the desired signal. The present invention provides a telecommunications transmission system using zipper and having at least two VDSL systems. Each VDSL system comprises a pair of zipper modems communicating over a cable transmission path. The telecommunications transmission system handles zipper transmission transmitted over the common cable; at least partly mitigates NEXT; and permits transmissions in a first VDSL system which are asynchronous with transmissions in a second VDSL system.Type: GrantFiled: February 17, 1999Date of Patent: September 26, 2006Assignee: STMicroelectronics NVInventors: Mikael Isaksson, Daniel Bengtsson, Frank Sjöberg, Per Ödling, Rickard Nilsson, Gunnar Bahlenberg, Magnus Johansson, Lennart Olsson, Göran Ökvist
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Patent number: 7069165Abstract: The invention refers to single-ended test of a loop with the aid of a transceiver, wherein an input impedance (Zin(ƒ)) of the loop is generated. The transceiver has a digital part, a codec and an analog part and is connected to the loop. With the aid of a transmitted and a reflected broadband signal (vin, vout) an echo transfer function Hecho(ƒ)=V(f)out/Vin(f) is generated, which also can be expressed as H echo ? ( f ) = H ? ? ( f ) ? Z in ? ( f ) + Z h0 ? ( f ) Z in ? ( f ) + Z hyb ? ( f ) . Here Zh0(ƒ), Zhyb(ƒ) and H?(ƒ) are model values for the transceiver. In a calibration process a test transceiver, with the same type of hardware as the transceiver, is connected to known impedances, replacing the loop. Hecho(ƒ)=V(f)out/Vin(f) is generated for the known impedances and the model values are generated and are stored in a memory in the transceiver.Type: GrantFiled: May 7, 2004Date of Patent: June 27, 2006Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Jonas Gustafsson Rosenberg, Fredrik Lindqvist, Adam Wiå, Antoni Fertner, Axel Frank Jensen, Per Ola Börjesson, Per Ödling
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Patent number: 7050489Abstract: One problem, frequently encountered with VDSL transmission systems, is that upstream FEXT produced by system users having short wires can be very strong. Users having shorter wires get high bit rates whereas users having longer wires get low bit rates. In extreme cases it may happen that users with wire lengths greater than 1000 meter cannot transmit data upstream. The present invention provides a VDST transmission system with a plurality of modems. The modems are located at varying distances from a central station. There is a target bit rate for each modem. That modems on shorter wires have control means for reducing their transmit power. This reduces the FEXT produced by these modems enabling modems on longer wires to transmit at higher bit rates.Type: GrantFiled: November 18, 1999Date of Patent: May 23, 2006Assignee: STMicroelectronics NVInventors: Frank Sjöberg, Sarah Kate Wilson, Rickard Nilsson, Daniel Bengtsson, Mikael Isaksson, Tomas Nordström, Per Ödling, Gunnar Bahlenberg, Magnus Johansson, Lennart Olsson, Sven-Göran Ökvist
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Patent number: 7039020Abstract: The hybrid circuit can be used to substantially reduce near echo signals. The circuit includes a balanced 2-wire to 4-wire hybrid for interconnecting a two wire receive path and a two wire transmit path to a two wire transmission line. The two wire receive path connects the balanced hybrid to an A/D converter and the two wire transmit path connects a D/A converter to the balanced hybrid. The two wire receive path contains a filter, dimensioned to remove signals transmitted from the D/A converter. The invention is particularly adapted for use with FDD and OFDD.Type: GrantFiled: October 27, 1998Date of Patent: May 2, 2006Assignee: STMicroelectronics N.V.Inventors: Gunnar Bahlenberg, Daniel Bengtsson, Siwert Hakansson, Anders Isaksson, Lars-Ake Isaksson, Mikael Isaksson, Magnus Johansson, Mauritz Lahti, Lis-Marie Ljunggren, Hans Lundberg, Tomas Nordstrom, Lennart Olsson, Sven-Rune Olofsson, Tomas Stefansson, Hans Oman, Goran Okvist, Per Odling, Petra Dentgen, Franck Sjöberg
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Publication number: 20050089114Abstract: A method and arrangement in a communication system for dynamically allocating communication system frequency spectrum after cross-talk interference between transmission medias used for upstream and downstream communication in the frequency spectrum. After detecting cross-talk interference on a disturbed transmission medium caused by transmission on a disturbing transmission of medium, the arrangement transmits a media control signal on the disturbed transmission medium and detects a reproduced media control signal that is reproduced due to cross-talk on the disturbing transmission medium. The disturbed or disturbing transmission media can then be dynamically allocated different frequency spectrum to eliminate the interference. In one embodiment, each transmission medium has a default transmission direction, and if one of the transmissions is in a direction opposite the default direction, that transmission is reassigned to another transmission medium.Type: ApplicationFiled: November 21, 2001Publication date: April 28, 2005Inventors: Per Hakan Albin Johansson, Per Odling, Pal Frenger, Bjorn Bohlin
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Publication number: 20050027456Abstract: The invention refers to single-ended test of a loop with the aid of a transceiver, wherein an input impedance (Zm(ƒ)) of the loop is generated. The transceiver has a digital part, a codec and an analog part and is connected to the loop. With the aid of a transmitted and a reflected broadband signal (vin, vout) an echo transfer function Hecho(ƒ)=V(f)out/Vin(f) is generated, which also can be expressed as H echo ? ( f ) = H ? ? ( f ) ? Z in ? ( f ) + Z h0 ? ( f ) Z in ? ( f ) + Z hyb ? ( f ) Here Zh0(ƒ), Zhyb(ƒ) and H?(ƒ) are model values for the transceiver. In a calibration process a test transceiver, with the same type of hardware as the transceiver, is connected to known impedances, replacing the loop. Hecho(ƒ)=V(f)out/Vin(f) is generated for the known impedances and the model values are generated and are stored in a memory in the transceiver.Type: ApplicationFiled: May 7, 2004Publication date: February 3, 2005Inventors: Jonas Rosenberg, Fredrik Lindqvist, Adam Wia, Antoni Fertner, Axel Jensen, Per Borjesson, Per Odling
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Patent number: 6738440Abstract: A RFI canceller, for use in a subscriber line system using multi-carrier modulation, measures a RFI disturbance in carriers falling within a band of frequencies causing the RFI. The RFI ingress into carriers outside the band of frequencies is estimated, and an error correcting signal derived from the estimation of the RFI ingress is subtracted from a received signal. The subscriber line system may be a VDSL system and the multi-carrier modulation may be DMT. The RFI canceller includes a demodulator for demodulating an incoming data stream to provide a first parallel data stream. A parallel to serial convertor converts the first parallel data stream to a first serial data stream. A digital to analogue convertor converts the first serial data stream to a first analogue signal. An analogue RFI canceller circuit combines the analogue signal with an analogue error correcting signal, to produce a second analogue signal.Type: GrantFiled: December 27, 2000Date of Patent: May 18, 2004Assignee: STMicroelectronics N.V.Inventors: Mikael Isaksson, Magnus Johansson, Lennart Olsson, Tomas Stefansson, Hans Ohman, Gunnar Bahlenberg, Anders Isaksson, Goran Okvist, Lis-Marie Ljunggren, Daniel Bengtsson, Sven-Rune Olofsson, Joachim Johansson, Per Ola Borjesson, Niklas Grip, Richard Nilsson, Frank Sjoberg, Sarah Wilson, Per Odling
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Patent number: 6606047Abstract: A circuit, for digitizing an analogue signal includes an analogue to digital converter, a clip processor adapted to estimate a value for clipped digital signal samples, and a buffer adapted to dynamically store a plurality of digitized samples produced by the analogue to digital converter. The clip processor is adapted to read digitized samples from the buffer and replace clipped digitized samples with the estimated values, thereby mitigating the effects of clipping in an output of the circuit.Type: GrantFiled: November 20, 2000Date of Patent: August 12, 2003Assignee: STMicroelectronics NVInventors: Per Ola Börjesson, Mikael Isaksson, Per Ödling, Daniel Bengtsson, Gunnar Bahlenberg, Magnus Johansson, Lennart Olsson, Sven Göran Ökvist
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Patent number: 6456649Abstract: A multi-carrier transmission system such as a DMT system. Channel information is transmitted between two transceivers using a plurality of sub-carriers modulated with symbols, each of which represents a multiplicity of bits. Each of the transceivers includes a receiver and a transmitter in which a fixed maximum value was determined for the number of bits for each symbol and in which the system is adapted to determine the bit capacity per symbol of each of the plurality of sub-carriers and to increase the number of bits represented by a symbol transmitted over those sub-carriers having a capacity less than a fixed maximum value to the maximum value by the addition of channel coding bits. The fixed maximum value for the number of bits for each symbol may be determined on the basis of the bit capacity of that one of the sub-carriers having the highest theoretical bit capacity may be at least as large as the theoretical bit capacity.Type: GrantFiled: August 30, 1999Date of Patent: September 24, 2002Assignee: STMicroelectronics N.V.Inventors: Mikael Isaksson, Magnus Johansson, Harry Tonvall, Lennart Olsson, Tomas Stefansson, Hans Ohman, Gunnar Bahlenberg, Anders Isaksson, Goran Okvist, Lis-Marie Ljunggren, Tomas Nordstrom, Lars-Ake Isaksson, Daniel Bengtsson, Siwert Hakansson, Ye Wen, Per Odling