Skip to main content
Article thumbnail
Location of Repository

A simple RLS-POCS solution for reduced complexity ADSL impulse shortening



Graduation date: 2000Recently, with the realization of the World Wide Web, the tremendous\ud need for high-speed data communications has grown. Several access techniques\ud have been proposed which utilize the existing copper twisted pair cabling. Of\ud these, the xDSL family, particularly ADSL and VDSL, have shown great promise\ud in providing broadband or near-broadband access through the common telephone\ud lines. A critical component of the ADSL and VDSL systems is the guard band\ud needed to eliminate the interference caused by the previously transmitted blocks.\ud This guard band must come in the form of redundant samples at the start of every\ud transmit block, and be at least as long as the channel impulse response. Since the\ud required guard band length is much greater than the length of the actual transmitted\ud samples, techniques to shorten the channel impulse response must be considered.\ud In this thesis, a new algorithm based on the RLS error minimization and POCS\ud optimization techniques will be applied to the channel impulse-shortening problem\ud in an ADSL environment. As will be shown, the proposed algorithm will provide a much better solution with a minimal increase in complexity as compared to the existing LMS techniques

Year: 1999
OAI identifier:
Provided by: ScholarsArchive@OSU

Suggested articles


  1. (1997). A Bandwidth-Optimized Reduced-Complexity Equalized Multicarrier Transceiver," doi
  2. (1996). Adaptive Filter Theory: Third Edition,"
  3. (1986). Adaptive Signal Processing," doi
  4. (1993). Advanced Engineering Mathematics: Seventh Edition,"
  5. (1986). Design Issues in the ISDN U-Interface Transceiver," doi
  6. (1993). Equalizer Training Algorithms for Multicarrier Modulation Systems," Int. Conf Commun., doi
  7. (1995). MMSE Decision Feedback Equalizers and Coding-Part I: Equalization Results," doi
  8. (1998). Modified Conjugate Gradient Method for ADSL Echo Cancellation," Masters Thesis,
  9. (1996). Optimum Equalization of Multicarrier Systems via Projection Onto Convex Set," doi
  10. Standards Project for Interfaces Relating to Carrier to Customer Connection of Asymmetrical Digital Subscriber Line (ADSL) Equipment,"
  11. (1998). Vector Space Projections,"

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.