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公开(公告)号:US06738440B1
公开(公告)日:2004-05-18
申请号:US09530947
申请日:2000-12-27
申请人: 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
发明人: 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
IPC分类号: H04B1500
CPC分类号: H04L25/10 , H04B1/123 , H04L27/2647
摘要: 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.
摘要翻译: 用于在使用多载波调制的用户线路系统中的RFI消除器测量导致RFI的频率带内的载波中的RFI干扰。 估计RFI进入频带外的载波,并从接收到的信号中减去从估计RFI进入导出的纠错信号。 用户线路系统可以是VDSL系统,并且多载波调制可以是DMT。 RFI消除器包括用于解调输入数据流以提供第一并行数据流的解调器。 并行到串行转换器将第一并行数据流转换为第一串行数据流。 数模转换器将第一串行数据流转换为第一模拟信号。 模拟RFI消除器电路将模拟信号与模拟纠错信号相结合,产生第二个模拟信号。 模数转换器将第二模拟信号转换成第二串行数据信号。 串行到并行转换器将第二串行数据流转换为第二并行数据流。 调制器将第二并行数据流调制到多个载波上。