多用户VDSL2系统远端串扰抵消算法

J4 ›› 2014, Vol. 36 ›› Issue (04): 627-633.

多用户VDSL2系统远端串扰抵消算法

刘超，林基明

（桂林电子科技大学信息与通信学院，广西桂林 541004）

收稿日期:2013-01-07 修回日期:2013-04-03 出版日期:2014-04-25 发布日期:2014-04-25
基金资助:
国家自然科学基金资助项目（61071088,61172054，61261017）

Far-end crosstalk cancellation algorithm
in multi-user VDSL2 system

LIU Chao，LIN Jiming

(School of Information and Communication Engineering,Guilin University of Electronic Technology,Guilin 541004,China)

Received:2013-01-07 Revised:2013-04-03 Online:2014-04-25 Published:2014-04-25

摘要/Abstract

摘要：

随着宽带接入网速率提升，VDSL2技术成为最后一公里的主流接入方式。用户数量急剧增加使传输线路之间串扰成为制约VDSL2系统性能的重要因素，线路之间串扰分为近端串扰（NEXT）和远端串扰（FEXT），VDSL2系统采用正交频分复用调制技术，近端串扰可以通过滤波器滤除，远端串扰却无法消除。主要研究VDSL2系统远端串扰噪声消除的方法，提出远端串扰噪声如何进行评估和计算，推导出远端串扰噪声计算公式，通过公式可以计算出每条线路受到其他线路串扰噪声的大小，然后发送信号时通过串扰噪声预抵消运算，接收到的信号就能成功消除串扰噪声的影响，提高了接收信号的SNR值，进而提升了VDSL2传输速率。

关键词: 第二代甚高速数字线, 信噪比, 星座映射, 近端串扰, 远端串扰

Abstract:

As broadband access network speed advances,VDSL2 technology has become the mainstream method of the last mile access.The dramatic increase in the number of user transmission makes the signal crosstalk an important factor between the transmissions lines, which restricts VDSL2 system performance. The crosstalk between the lines is divided into a nearend crosstalk (NEXT) and a farend crosstalk (FEXT).VDSL2 system uses DMT carrier modulation technique, and nearend crosstalk can be filtered out by the filter, but farend crosstalk cannot be eliminated. This paper mainly studies a method of farend crosstalk noise cancellation in VDSL2 system, proposes how farend crosstalk noise is evaluated and calculated, and derives the farend crosstalk offset formula.And it calculates the influence of crosstalk noise from other lines on each line.The receiver’s signal can eliminate the influence of crosstalk noise by the crosstalk noise preelimination algorithm at the transmitter.Therefore,SNR values of the receiver's signal and VDSL2 transmission rate are improved.

Key words: VDSL2, signal to noise ratio;constellation mapping;near-end crosstalk;far-end crosstalk

刘超，林基明. 多用户VDSL2系统远端串扰抵消算法[J]. J4, 2014, 36(04): 627-633.

LIU Chao，LIN Jiming. Far-end crosstalk cancellation algorithm
in multi-user VDSL2 system [J]. J4, 2014, 36(04): 627-633.

参考文献

［1］Cook J W, Kirkby R H, Booth M G, et al. The noise and crosstalk environment for ADSL and VDSL systems［J］. IEEE Communication Magazine, 2006,37(5):7378.
［2］Cendrillon R, Ginis G, Van den Bogaert E, et al. A nearoptimal linear crosstalk precoder for downstream VDSL［J］. IEEE Transactions on Communications, 2007,55(5):860863.
［3］Shen Wei. Multiuser access network interence suppression and spectrum management algorithm［D］. Ningbo:Ningbo University, 2009.(in Chinese)
［4］Zafaruddin S M, Prakriya S, Prasad S. Performance analysis of zero forcing crosstalk canceler in vectored VDSL2［J］. IEEE Signal Processing Letters, 2012,19(4):219222.
［5］Gujrathi M L,Homer J,Vaughan I,et al. A detection guided normalized leastmeansquares adaptive partial crosstalk canceller for multiuser DSL environments［J］. IEEE Signal Processing Letters, 2009,16(6):489492.
［6］Li B, Tsiaflakis P, Monnen M, et al. Dynamic resource allocation based partial crosstalk cancellation in DSL networks［C］∥Proc of 2010 IEEE Global Telecommunications Conference (GLOBECOM 2010),2010:15.
［7］ITU std. G.993.2, Very high speed digital subscriber line transceivers(VDSL2)［S］. 2006.
［8］Wang Kun. The key technology of crosstalk cancellation in VDSL2 system［J］. Modern Telecommunications Technology, 2007,37(3):5258.(in Chinese)
［9］Leshem A, Li Youming. A low complexity linear precoding technique for next generation VDSL downstream transmission over copper［J］. IEEE Transactions on Signal Processing, 2007,55(11):55275534.
［10］Cendrillon R, Huang Jianwei, Chiang M, et al. Autonomous spectrum balancing for digital subscriber lines［J］. IEEE Transactions on Signal Processing, 2007,55(8):42414257.
［11］ITU std. G.993.5, SelfFEXT cancellation (vectoring) for use with VDSL2 transceivers［S］. 2009.
［12］Wen Huafeng, Li Jinxiang, Yang Rener. The simulation and modeling in VDSL channel［J］. Journal of Ningbo University, 2008,21(4):453456.(in Chinese)

附中文参考文献：
［3］沈微. 多用户接入网中的干扰抑制和频谱管理算法研究［D］. 宁波：宁波大学, 2009.
［8］汪坤. VDSL2串音消除的关键技术［J］. 现代电信科技, 2007,37(3):5258.
［12］文化锋，励金祥，杨任尔. VDSL信道建模与仿真［J］. 宁波大学学报,2008,21(4):453456.

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