Asymmetric OFDM Systems Based on Layered FFT Structure
Authors:
- Zhang JianZJZhang Jian
- A. D. S. JayalathAJA. D. S. Jayalath
- Ying ChenYCYing Chen
- 22 October 2007
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Signal Processing Letters
- Vol. 14 (11) , 812-815
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
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