DFT based transceivers with windowing

Yuan-Pei Lin*, See May Phoong

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

In this paper we consider window designs for DFT (discrete Fourier transform) based multicarrier transceivers without using extra cyclic prefix. As in previous works of window designs for DFT based transceiver, a post processing matrix, generally channel dependent, is needed to have a zero-forcing receiver. We show that post processing 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 post processing affects SNR (signal to noise ratio) at the receiver, 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 penalty.

Original languageEnglish
Pages (from-to)574-579
Number of pages6
JournalProceedings - International Symposium on Computers and Communications
Volume2
DOIs
StatePublished - 1 Dec 2004
EventProceedings - ISCC 2004, Ninth International Symposium on Computers and Communications - Alexandria, Egypt
Duration: 28 Jun 20041 Jul 2004

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