Window designs for DFT-based multicarrier systems

Yuan-Pei Lin*, See May Phoong

*Corresponding author for this work

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

In this paper, we consider window designs for discrete Fourier transform (DFT) based multicarrier transceivers without using extra cyclic prefix. As in previous works of window designs for DFT-based transceivers, a postprocessing matrix that is generally channel dependent, is needed to have a zero-forcing receiver. We show that postprocessing is channel independent if and only if the window itself has the cyclic-prefixed property. We design optimal windows with minimum spectral leakage subject to the cyclic-prefixed condition. Moreover, we analyze how postprocessing affects the signal-to-noise ratio (SNR) at the receiver, which is an aspect that is not considered in most of the earlier works. The resulting SNR can be given in a closed form. Join optimization of spectral leakage and SNR are also considered. Furthermore, examples demonstrate that we can have a significant reduction in spectral leakage at the cost of a small SNR loss. In addition to cyclic-prefixed systems, window designs for zero-padded DFT-based transceivers are considered. For the zero-padded transceivers, windows that minimize spectral leakage can also be designed.

Original languageEnglish
Pages (from-to)1015-1024
Number of pages10
JournalIEEE Transactions on Signal Processing
Volume53
Issue number3
DOIs
StatePublished - 1 Mar 2005

Keywords

  • DMT
  • Egress control
  • Multicarrier
  • PSD mask
  • Window

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