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  • Research Article
  • Open Access

A Heuristic Optimal Discrete Bit Allocation Algorithm for Margin Maximization in DMT Systems

EURASIP Journal on Advances in Signal Processing20072007:012140

  • Received: 14 July 2006
  • Accepted: 25 December 2006
  • Published:


A heuristic optimal discrete bit allocation algorithm is proposed for solving the margin maximization problem in discrete multitone (DMT) systems. Starting from an initial equal power assignment bit distribution, the proposed algorithm employs a multistaged bit rate allocation scheme to meet the target rate. If the total bit rate is far from the target rate, a multiple-bits loading procedure is used to obtain a bit allocation close to the target rate. When close to the target rate, a parallel bit-loading procedure is used to achieve the target rate and this is computationally more efficient than conventional greedy bit-loading algorithm. Finally, the target bit rate distribution is checked, if it is efficient, then it is also the optimal solution; else, optimal bit distribution can be obtained only by few bit swaps. Simulation results using the standard asymmetric digital subscriber line (ADSL) test loops show that the proposed algorithm is efficient for practical DMT transmissions.


  • Information Technology
  • Quantum Information
  • Allocation Scheme
  • Maximization Problem
  • Allocation Algorithm

Authors’ Affiliations

Department of Electronic Engineering, School of Information Science and Technology, Tsinghua University, Beijing, 100084, China
National Key Laboratory of Space Microwave Technology, Xi'an Institute of Space Radio Technology, Xi'an, 710100, China


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© Li-Ping Zhu et al. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.