효율적 Cyclinc Extension을 갖는 Zipperqkdtlr의 VDSL 모뎀

A Zipper-based VDSL Modem with an Efficient Cyclic Extension

  • 위정욱 (중앙대학교 전자전기공학부)
  • 발행 : 2000.10.01

초록

In this paper we propose an efficient implementation technique for cyclic extension in VDSL(Very High bit-rate Digital Subscriber Line) systems using Zipper duplexing and analyze its performances under typical telephone channel environments. In Zipper-based VDSL systems each DTM(discrete-multitone) block is appended by both cyclic prefix(CP) and cyclic suffix(CS). The CP is inserte to prevent both intersymbol interference (ISI) and iterchannel interference (ICI) while the CS is appended to ensure orthogonality between the upstream and downstream carriers thus preventing near-end crosstalk (NEXT). However in order to implement the CP in the transmitter side of the VDSL system an additional hardware is required to append the latter part of each DMT symbol to the beginning of the DMT symbol. In this paper we propose a VDSL system with Zipper duplexing using only CS to reduce hardware complexity (memory and processing delay) required for implementation of CP. It is shown by computer simulation that the proposed approach has the same capacity under typical channel environments as the previous Zipper-based VDSL system using both CP and CS. even with a significantly lower hardware complexity.

키워드

참고문헌

  1. IEEE Tran. on Commun. v.47 no.8 Zipper:A Duplex Method for VDSL Based on DMT F.Sjoberg;M.Isaksson;R.Nilsson;P.Odling;S.K.Wilson
  2. ANSI T1E1.4/98-041 Pulse Shaping with Zipper - Spectral Compatibility and Asynchrony M.Isaksson;F.Sjoberg;R.Nilsson;P.Odling;D.Bengtsson;D.Mestdagh
  3. ANSI T1E1.4/97/016 Zipper - a duplex scheme for VDSL based on DMT M.Isaksson;D.Bengtsson;P.Deutgen;M.Sandell;F.Sjoberg;P.Odling;H.Ohman
  4. Tech. Rep. T1E1.4/98-337 VDSL Alliance DMT VDSL Draft Standard Proposal ANSI
  5. ADSL, VDSL, and Multicarrier Modulcation J.A.C.Bingham
  6. Telia Research AB, Aurorum 6, SE-977 75 Zipper - a flexible duplex method for VDSL M.Isaksson;P.Deutgen;F.Sjoberg;S.K.Wilson;P.Odling;P.O.Borjesson
  7. T1E1.4/98-043R8 Very-high-speed Digital Subscriber Lines - System Requirements, Technical Document ANSI