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公开(公告)号：DE69922176T2
公开(公告)日：2005-11-10
申请号：DE69922176
申请日：1999-02-17
Applicant: ST MICROELECTRONICS NV
Inventor： ISAKSSON MIKAEL , BENGTSSON DANIEL , SJOEBERG FRANK , OEDLING PER , NILSSON RICKARD , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST 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：DE69811716T2
公开(公告)日：2003-12-04
申请号：DE69811716
申请日：1998-11-11
Applicant: ST MICROELECTRONICS NV
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , BENGTSSON DANIEL , OLOFSSON SVEN-RUNE , JOHANSSON JOACHIM , BOERJESSON OLA , GRIP NIKLAS , NILSSON RICHARD , SJOEBERG FRANK , WILSON SARAH , 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：DE69912148D1
公开(公告)日：2003-11-20
申请号：DE69912148
申请日：1999-11-18
Applicant: ST MICROELECTRONICS NV
Inventor： SJOEBERG FRANK , WILSON KATE , NILSSON RICKARD , BENGTSSON DANIEL , ISAKSSON MIKAEL , NORDSTROEM TOMAS , OEDLING PER , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST SVEN-GOERAN
IPC: H04J11/00 , H04B3/04 , H04B3/32 , H04L29/10 , H04M20060101
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公开(公告)号：AT227911T
公开(公告)日：2002-11-15
申请号：AT97939277
申请日：1997-09-01
Applicant: ST MICROELECTRONICS NV
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-AKE , BENGTSSON DANIEL , HAKANSSON SIWERT , WEN YE , OEDLING PER
Abstract: 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.
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公开(公告)号：DE69912148T2
公开(公告)日：2004-07-08
申请号：DE69912148
申请日：1999-11-18
Applicant: ST MICROELECTRONICS NV
Inventor： SJOEBERG FRANK , WILSON KATE , NILSSON RICKARD , BENGTSSON DANIEL , ISAKSSON MIKAEL , NORDSTROEM TOMAS , OEDLING PER , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST SVEN-GOERAN
IPC: H04J11/00 , H04B3/04 , H04B3/32 , H04L29/10 , H04M20060101
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Patent Agency Ranking
公开(公告)号：DE69910015D1
公开(公告)日：2003-09-04
申请号：DE69910015
申请日：1999-05-11
Applicant: ST MICROELECTRONICS NV
Inventor： BOERJESSON 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：DE69717122T2
公开(公告)日：2003-08-21
申请号：DE69717122
申请日：1997-09-01
Applicant: ST MICROELECTRONICS NV
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-AKE , BENGTSSON DANIEL , HAKANSSON SIWERT , WEN YE , OEDLING PER
Abstract: 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.
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公开(公告)号：DE69922176D1
公开(公告)日：2004-12-30
申请号：DE69922176
申请日：1999-02-17
Applicant: ST MICROELECTRONICS NV
Inventor： ISAKSSON MIKAEL , BENGTSSON DANIEL , SJOEBERG FRANK , OEDLING PER , NILSSON RICKARD , BAHLENBERG GUNNAR , JOHANSSON MAGNUS , OLSSON LENNART , OEKVIST 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：DE69910015T2
公开(公告)日：2004-04-15
申请号：DE69910015
申请日：1999-05-11
Applicant: ST MICROELECTRONICS NV
Inventor： BOERJESSON 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：DE69811716D1
公开(公告)日：2003-04-03
申请号：DE69811716
申请日：1998-11-11
Applicant: ST MICROELECTRONICS NV
Inventor： ISAKSSON MIKAEL , JOHANSSON MAGNUS , OLSSON LENNART , STEFANSSON TOMAS , OEHMAN HANS , BAHLENBERG GUNNAR , ISAKSSON ANDERS , OEKVIST GOERAN , LJUNGGREN LIS-MARIE , BENGTSSON DANIEL , OLOFSSON SVEN-RUNE , JOHANSSON JOACHIM , BOERJESSON OLA , GRIP NIKLAS , NILSSON RICHARD , SJOEBERG FRANK , WILSON SARAH , 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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