Paper Info
Title
Doppler scaling correction in OFDM.
Abstract
This paper introduces the use of non-uniform fast Fourier transform (NUFFT) in detection of orthogonal frequency division multiplexing (OFDM) in a situation when the received signal samples are unevenly spaced. The application of interest to us is underwater acoustic communications, where the relatively low speed of (acoustic) signal propagation in water combined with movement of communicating vehicles introduces a time-varying time-scale to the received signal. This is called Doppler scaling. In the presence of Doppler scaling, when the received signal is sampled at the nominal rate, the samples will be seen as unevenly spaced within the domain of transmit signal. This leads to an undetectable OFDM signal, if not corrected. We develop the necessary equations that show how NUFFT should be applied to this application. We also discuss a method of Doppler scaling estimation by using of null subcarriers that we assume are inserted in the OFDM signal. Moreover, we examine our development on real signals obtained from an at-sea experiment (ACOMM10) and confirm its correct operation.
Year
DOI
Venue
2013
10.1109/ICC.2013.6655317
ICC
Keywords
Field
DocType
orthogonal frequency division multiplexing,underwater acoustic communication,interpolation,doppler effect,frequency domain analysis,signal processing,ofdm,underwater acoustics,accuracy,estimation theory,fast fourier transforms,ofdm modulation
Frequency domain,Signal processing,Telecommunications,Underwater acoustic communication,Computer science,Algorithm,Underwater acoustics,Real-time computing,Fast Fourier transform,Estimation theory,Doppler effect,Orthogonal frequency-division multiplexing
Conference
ISSN
Citations 
PageRank 
1550-3607
0
0.34
References 
Authors
0
2
Name
Order
Citations
PageRank
Chung Him (George) Yuen1735.16
Behrouz Farhang-Boroujeny297284.30