Asymmetric OFDM Systems Based on Layered FFT Structure

Author

Zhang Jian ; Jayalath, A.D.S. ; Ying Chen

Author_Institution

Nat. ICT Australia, Canberra

Volume

14

Issue

11

fYear

2007

Firstpage

812

Lastpage

815

Abstract

In this letter, we first extend the convolution theory of discrete Fourier transform (DFT) and introduce a structure of layered fast Fourier transform (FFT). Based on this framework, we propose novel asymmetric orthogonal frequency-division multiplexing (OFDM) systems that bridge general OFDM and single carrier systems. Adaptive to the capability of the transceiver, asymmetric OFDM systems provide significant flexibility in system design and operation. We show how effects of noise enhancement and frequency diversity counteract each other in asymmetric OFDM systems. Performance comparison with general OFDM and single carrier systems is also given.

Keywords

OFDM modulation; convolution; discrete Fourier transforms; diversity reception; transceivers; asymmetric OFDM system; convolution theory; discrete Fourier transform; fast Fourier transform; frequency diversity; layered FFT structure; noise enhancement; orthogonal frequency-division multiplexing; single carrier system; transceiver; Australia; Bridges; Convolution; Discrete Fourier transforms; Fast Fourier transforms; Frequency division multiplexing; OFDM; Peak to average power ratio; Signal processing algorithms; Transceivers; Fast Fourier transform (FFT); frequency diversity; orthogonal frequency-division multiplexing (OFDM); peak-to- average power ratio (PAPR);

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2007.903230

Filename

4351967