Frames theoretic analysis of zero-padding OFDM over deep fading wireless channels

The performance of the orthogonal frequency division multiplexing (OFDM) systems may be severely deteriorated when passing through wireless channels with the spectral nulls. Zero-Padding (ZP) for the OFDM signal guarantees the symbol recovery regardless of the channel spectral nulls if complicated Z...

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Bibliographic Details
Published in:IEEE transactions on broadcasting 2006-06, Vol.52 (2), p.252-260
Main Authors: Wang, J., Song, J., Yang, Z.-X., Yang, L.
Format: Article
Language:English
Subjects:
Applied sciences
Channel spectral nulls
Channels
Deterioration
DFT codes
Digital video broadcasting
Discrete Fourier transforms
DSL
Equalizers
Exact sciences and technology
Fading
Forward error correction
Frames
Interleaved codes
Intersymbol interference
Joints
OFDM
Orthogonal Frequency Division Multiplexing
Signal reconstruction
Simulation
Spectra
Systems, networks and services of telecommunications
TDS-OFDM
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Zero-Padding
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Summary:The performance of the orthogonal frequency division multiplexing (OFDM) systems may be severely deteriorated when passing through wireless channels with the spectral nulls. Zero-Padding (ZP) for the OFDM signal guarantees the symbol recovery regardless of the channel spectral nulls if complicated ZP-OFDM-MMSE equalizer is used. In this paper we first establish a connection between ZP-OFDM and DFT codes and then two novel signal reconstruction schemes, signal projection and low-complexity signal reconstruction, are presented to deal with the spectral nulls based on the frames theory. The simulation results demonstrate that significant performance improvement can be achieved using our proposed methods over the so-called ZP-OFDM overlap and add (ZP-OFDM OLA) scheme.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2006.872993