On power-loading algorithms for packet-access OFDM systems

Lin Tang, Honglin Hu, Hsiao-Hwa Chen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Numerous power-loading techniques for wireless applications have been proposed in the literature. However, most of the existing power-loading schemes may not always be suitable for packet-access orthogonal frequency-division multiplexing (OFDM) systems. In this paper, we propose a Lagrange multiplier power-loading (LMPL) algorithm for packet-access OFDM systems with fixed modulation and coding transmission. The proposed LMPL algorithm offers a closed-form solution for the power-loading optimization problem under a total transmit power constraint. As a closed-form solution may not be available for adaptive modulation and coding (AMC) transmission, we use a low-complexity joint LMPL algorithm to enhance the system throughput. Numerical results show that the proposed LMPL algorithms outperform the traditional channel inversion power-loading (CIPL) scheme. It is also shown that the theoretically derived throughput very well matches the simulation results.

Original languageEnglish
Article number5159471
Pages (from-to)5324-5330
Number of pages7
JournalIEEE Transactions on Vehicular Technology
Issue number9
Publication statusPublished - 2009 Nov 1

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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