A vector coding scheme with improved spectral efficiency for OFDM with frequency error

Shih Jen Yang, Yung Yi Wang*, Wei Wei Chen

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

2 Scopus citations

Abstract

This study proposes a subspace-based inter-carrier interference (ICI) cancellation scheme for orthogonal-frequency-division-multiplexing (OFDM) systems. Conventional ICI cancellation methods suffer from the loss of spectral efficiency, and cannot handle the ICI incurred by a large frequency error. To improve the spectral efficiency, the proposed approach uses a subspace-based precoder that maps at most L−1 data symbols to a group of L consecutive subcarriers. At the receiver, the proposed approach first coarsely estimate the frequency bias through a set of nulling filters each defined on a dedicated spectral bin. Then, based on the estimate of the frequency bias, the proposed approach uses subcarrier-combiners to eliminate intra-group interference. Computer simulations show that in addition to achieving a high spectral efficiency proportional to the precoder order, the proposed approach can effectively eliminate the ICI caused by a large-frequency-error.

Original languageEnglish
Pages (from-to)2881-2897
Number of pages17
JournalJournal of the Franklin Institute
Volume353
Issue number13
DOIs
StatePublished - 01 09 2016

Bibliographical note

Publisher Copyright:
© 2016 The Franklin Institute

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