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公开(公告)号：SE9603187D0
公开(公告)日：1996-09-02
申请号：SE9603187
申请日：1996-09-02
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY E , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG KJELL GUNNAR , ISAKSSON ANDERS I , OEKVIST SVEN GOERAN , LJUNGGREN KARIN L-M , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL
IPC: H04L20060101 , H04L5/06 , H04L27/26 , H04L
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公开(公告)号：EE200000184A
公开(公告)日：2001-04-16
申请号：EEP200000184
申请日：1998-10-27
Applicant: TELIA AB
Inventor： BAHLENBERG GUNNAR , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON LARS-AAKE , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LAHTI MAURITZ , LJUNGGREN LIS-MARI , LUNDBERG HANS , NORDSTROEM TOMAS , OLSSON LENNART , OLOFSSON SVEN-RUNE , STEFANSSON TOMAS , OEMAN HANS , OEKVIST GOERAN , OEDLING PER , DENTGEN PETRA , SJOEBERG FRANK
IPC: H04B3/23
Abstract: 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.
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公开(公告)号：NO20002138A
公开(公告)日：2000-06-29
申请号：NO20002138
申请日：2000-04-27
Applicant: TELIA AB
Inventor： BAHLENBERG GUNNAR , BENGTSSON DANIEL , HOKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON LARS-KE , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LAHTI MAURTIZ , LJUNGGREN LIS-MARIE , LUNDBERG HANS , NORDSTROEM TOMAS , OLSSON LENNART , OLOFSSON SVEN-RUNE , STEFANSSON TOMAS , IMAN HANS , IKVIST GOERAN , IDLING PER , DENTGEN PETRA , SJOEBERG FRANCK
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公开(公告)号：SE510641C2
公开(公告)日：1999-06-14
申请号：SE9704009
申请日：1997-11-03
Applicant: TELIA AB
Inventor： OLSSON LENNART , BAHLENBERG K-G , BENGTSSON DANIEL , HAAKANSSON SIWERT , ISAKSSON ANDERS , ISAKSSON L-AA , ISAKSSON MIKAEL , JOHANSSON MAGNUS , LATHI MAURITZ , LJUNGGREN KARIN L-M , LUNDBERG HANS , NORDSTROEM TOMAS , OLOFSSON S-R , STEFANSSON TOMAS , OEHMAN HANS , OEKVIST S G , OEDLING PER , DENTGEN PETRA , SJOEBERG FRANK
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公开(公告)号：NO990778D0
公开(公告)日：1999-02-19
申请号：NO990778
申请日：1999-02-19
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , IHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , IKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HOKANSSON SIWERT , WEN YE
Abstract: PCT No. PCT/SE97/01461 Sec. 371 Date Jun. 14, 1999 Sec. 102(e) Date Jun. 14, 1999 PCT Filed Sep. 1, 1997 PCT Pub. No. WO98/10556 PCT Pub. Date Mar. 12, 1998A multi-carrier transmission system, particularly a discrete multi-tone (DMT) system. Data is transmitted between two transceivers using a plurality of carriers. The frequency bandwidth of the system is divided between the plurality of carriers. The transmission system is adapted for operation in a heterogeneous network including a number of subscriber equipments having different channel characteristics and coexisting on the same cable. The length of cable for each subscriber terminal varies in relation to its respective location. The transmission system includes an allocation device for allocating the traffic of subscriber equipments having a shorter length of cable to tones starting from a higher frequency band of the system bandwidth.
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Patent Agency Ranking
公开(公告)号：NO990776D0
公开(公告)日：1999-02-19
申请号：NO990776
申请日：1999-02-19
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , IHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , IKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HOKANSSON SIWERT , WEN YE
Abstract: A multi-carrier transmission system such as a DMT based VDSL system. The system uses orthogonal carriers with high order QAM constellations for the transmission of multiple bits per carrier and symbol. This estimate includes digital receiver and transmitter units with the receiver unit including a symbol detection unit. This system is adapted to determine a parameter for each single carrier with the parameter being indicative of a deviation of a received signal from a corresponding constellation point. It compares the parameter with an upper lower limit and if the parameter is outside the limits, changes the constellation used to modulate the carrier to a neighboring constellation. The symbol detection unit may be used to determine a parameter such as the ratio d2/sigma2, where d is the shortest distance between neighboring constellations, sigma is a standard deviation and sigma2 is the variance of the deviations of the input and output signal values of the symbol detection unit.
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公开(公告)号：NO990769D0
公开(公告)日：1999-02-19
申请号：NO990769
申请日：1999-02-19
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , IHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , IKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HOKANSSON SIWERT , WEN YE
Abstract: A multi-carrier transmission system, such as a DMT system. A receiver must be able to recover a sampling clock that is very accurately synchronized to a transmitter sampling clock. Typically, synchronization is achieved by using a reserved carrier, the pilot carrier, which is transmitted with a fixed phase. The receiver sampling clock is then phase locked to the pilot carrier. Frame timing can be recovered by using a correlation technique. Thus an improved method of recovering a sample clock and phase locking the sampling clock to a pilot carrier is provided.
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公开(公告)号：SE506643C2
公开(公告)日：1998-01-26
申请号：SE9603196
申请日：1996-09-02
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY ERLAND , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG KJELL GUNNAR , ISAKSSON ANDERS IMANUEL , OEKVIST SVEN GOERAN , LJUNGGREN KARIN LIS-MARI , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , YE WEN , HAAKANSSON SIWERT
IPC: H04L20060101 , H04L5/06 , H04L27/26
Abstract: The system includes a digital receiver unit and transmission unit. The receiver unit including a symbol detection unit. The system determines a parameter for each individual carrier wave. The parameter indicate a deviation in a received signal from a corresponding constellation point. The parameter is compared with an upper and a lower limit. When the parameter is outside the limits the used constellation is altered in order to modulate the carrier wave to a neighbouring constellation. The symbol detection unit is used to determine the parameter for a carrier wave. The parameter is a ratio d2/o2, where d is the shortest distance between adjoining constellations, o is a standard deviation, and o2 is the variance in the deviations in the input and output signal values in the symbol detection unit.
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公开(公告)号：SE506642C2
公开(公告)日：1998-01-26
申请号：SE9603195
申请日：1996-09-02
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY ERLAND , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG KJELL GUNNAR , ISAKSSON ANDERS IMANUEL , OEKVIST SVEN GOERAN , LJUNGGREN KARIN LIS-MARI , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , YE WEN , HAAKANSSON SIWERT
IPC: H04L20060101 , H04L5/06 , H04L27/26 , H04L27/34
Abstract: The method involves superimposing control channel on a user data channel within same nQAM constellation by binary data comprising both user data and control data. Separation of the control data is carried out by arranging control data points to have either unique phase, or unique amplitude, values which are not employed for user data points. The unique phase values fall on the boundaries between quadrants of a nQAM constellation. The user data points have phase values falling within the quadrants of the nQAM constellation.
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公开(公告)号：SE506637C2
公开(公告)日：1998-01-26
申请号：SE9603190
申请日：1996-09-02
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY E , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG KJELL GUNNAR , ISAKSSON ANDERS I , OEKVIST SVEN GOERAN , LJUNGGREN KARIN L-M , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , YE WEN , HAAKANSSON SIWERT
IPC: H04L20060101 , H04L5/06 , H04L27/26
Abstract: The receiver includes a selector for selecting a frame from a stream of received time domain data. A one frequency DFT mechanism performs a one frequency DFT on the selected frame to produce a complex number representing the pilot carrier. The argument of the complex number is the pilot carrier's phase. A processor derives the argument from the complex number using an inverse tangent operation. The multicarrier system is a discrete multitone (DMT) system. The receiver includes a correlator deriving a frame start signal from the stream of time domain data.
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