Joint effects of synchronization errors of OFDM systems in doubly-selective fading channels
EURASIP Journal on Advances in Signal Processing
On efficient channel estimation for underwater acoustic OFDM systems
Proceedings of the Fourth ACM International Workshop on UnderWater Networks
Adaptive time interpolator for OFDM systems in time-variant channels
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
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Orthogonal frequency division multiplexing (OFDM) can be used in ultrawideband (UWB) communications to deal with delay spread of UWB channels. Relative motion between transmitter, receiver, and scattering environment induces Doppler spread. Since Doppler shift is proportional to subcarrier frequency, the time-selective fading is subcarrier dependent. In a narrowband (NB) system, this dependence is negligible, and all subcarriers are subjected to the same time-selective fading. However, in a UWB system, different subcarriers will experience different fading. In this paper, intercarrier interference (ICI) caused by the relative motion between transmitter and receiver in OFDM-based UWB communications is investigated. An exact expression as well as bounds is derived for the degradation of performance measured by signal-to-interference ratio (SIR). A design example is given to illustrate the concepts developed in the paper.