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1.发明申请
公开(公告)号：WO9810551A3
公开(公告)日：1998-05-07
申请号：PCT/SE9701456
申请日：1997-09-01
Applicant: TELIA AB , ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS MARIE , NORDSTROEM TOMAS , ISAKSSON LARS AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE , OEDLING PER
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , TONVALL HARRY , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , NORDSTROEM TOMAS , ISAKSSON LARS-AAKE , BENGTSSON DANIEL , HAAKANSSON SIWERT , WEN YE , OEDLING PER
CPC classification number: H04L5/0046 , H04L1/0065 , H04L1/0071 , H04L5/0007 , H04L5/006
Abstract: The invention provides a multi-carrier transmission system, for example, a DMT system, in which 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 said transceivers including a receiver and a transmitter, in which a fixed maximum value is 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 said 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 the fixed maximum value, to said 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 and may be at least as large as said theoretical bit capacity.
Abstract translation: 本发明提供了一种多载波传输系统，例如一种DMT系统，其中使用用符号调制的多个子载波在两个收发信机之间传输信道信息，每个子载波代表多个比特，每个所述收发信机 包括一个接收机和一个发射机，其中为每个符号的比特数确定一个固定的最大值，并且其中该系统适合于确定所述多个子载波中的每一个的每个符号的比特容量，以及 通过增加信道编码比特，将在具有小于固定最大值的容量的那些子载波上发送的由码元表示的比特的数量增加到所述最大值。 每个符号的比特数的固定最大值可以基于具有最高理论比特容量的那个子载波的比特容量来确定，并且可以至少与所述理论比特容量一样大。
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公开(公告)号：SE9801816L
公开(公告)日：1999-11-21
申请号：SE9801816
申请日：1998-05-20
Applicant: TELIA AB
Inventor： BOERJESSON PER OLA , ISAKSSON MIKAEL , OEDLING PER , BENGTSSON DANIEL , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST GOERAN
IPC: H03M1/12
Abstract: 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.
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公开(公告)号：SE9801150L
公开(公告)日：1999-08-22
申请号：SE9801150
申请日：1998-04-01
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , BENGTSSON DANIEL , SJOEBERG FRANK , OEDLING PER , NILSSON RICKARD , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST SVEN GOERAN
Abstract: 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.
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公开(公告)号：SE9704256D0
公开(公告)日：1997-11-18
申请号：SE9704256
申请日：1997-11-18
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG KJELL G , ISAKSSON ANDERS I , OEKVIST SVEN G , LJUNGGREN KARIN L-M , BENGTSSON DANIEL , OLOFSSON SVEN-RUNE , JOHANSSON JOACHIM , BOERJESSON PER O , GRIP NIKLAS , NILSSON RICKARD , SJOEBERG FRANK , WILSON SARAH K , OEDLING PER
Abstract: 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. An analogue to digital convertor converts the second analogue signal to a second serial data signal. A serial to parallel convertor converts the second serial data stream to a second parallel data stream. A modulator modulates the second parallel data stream onto a multiplicity of carriers.
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公开(公告)号：SE9704010D0
公开(公告)日：1997-11-03
申请号：SE9704010
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
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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Patent Agency Ranking
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：SE9704256L
公开(公告)日：1999-07-09
申请号：SE9704256
申请日：1997-11-18
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG KJELL G , ISAKSSON ANDERS I , OEKVIST SVEN G , LJUNGGREN KARIN L-M , BENGTSSON DANIEL , OLOFSSON SVEN-RUNE , JOHANSSON JOACHIM , BOERJESSON PER O , GRIP NIKLAS , NILSSON RICKARD , SJOEBERG FRANK , WILSON SARAH K , OEDLING PER
Abstract: 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. An analogue to digital convertor converts the second analogue signal to a second serial data signal. A serial to parallel convertor converts the second serial data stream to a second parallel data stream. A modulator modulates the second parallel data stream onto a multiplicity of carriers.
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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：SE9900788D0
公开(公告)日：1999-03-05
申请号：SE9900788
申请日：1999-03-05
Applicant: TELIA AB
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公开(公告)号：SE9704009D0
公开(公告)日：1997-11-03
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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