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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：SE514016C2
公开(公告)日：2000-12-11
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：SE511521C2
公开(公告)日：1999-10-11
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：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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Patent Agency Ranking
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：SE9804021D0
公开(公告)日：1998-11-21
申请号：SE9804021
申请日：1998-11-21
Applicant: TELIA AB
Inventor： SJOEBERG FRANK , BENGTSSON DANIEL , OEDLING PER , OLSSON LENNART , WILSON SARAH KATE , ISAKSSON MIKAEL , BAHLENBERG GUNNAR , OEKVIST SVEN GOERAN , NILSSON RICKARD , NORDSTROEM THOMAS , JOHANSSON MAGNUS
IPC: H04B20060101 , H04B
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公开(公告)号：SE9801150D0
公开(公告)日：1998-04-01
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：AU2009000A
公开(公告)日：2000-06-13
申请号：AU2009000
申请日：1999-11-18
Applicant: TELIA AB
Inventor： SJOBERG FRANK , WILSON SARAH KATE , NILSSON RICKARD , BENGTSSON DANIEL , ISAKSSON MIKAEL , NORDSTROM TOMAS , ODLING PER , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OKVIST SVEN-GORAN
IPC: H04J11/00 , H04B3/04 , H04B3/32 , H04L29/10 , H04M20060101
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公开(公告)号：SE9800539D0
公开(公告)日：1998-02-21
申请号：SE9800539
申请日：1998-02-21
Applicant: TELIA AB
Inventor： ISAKSSON MIKAEL , BENGTSSON DANIEL , SJOEBERG FRANK , OEDLING PER , NILSSON RICKARD , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST SVEN GOERAN
IPC: H04L20060101 , H04L
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