Channel estimation in ECMA-368-based UWB systems with unknown interference

S. M.Riazul Islam, M. A. Ameen, Kyung Sup Kwak

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Ultra-wideband (UWB) is one of the fledging paradigms that the next generation of wireless personal area network (WPAN) is developing towards. With its appealing dimensions, UWB communication comes with a set of challenges of which channel estimation is prominent. In this article, we explore the problem of channel estimation in ECMA-368-based multiband orthogonal frequency division multiplexing (MB-OFDM) UWB system affected by unknown narrowband interference (NBI). We analytically show that the unknown NBI causes larger variance of a channel estimator. Thus, MB-OFDM UWB systems are supposed to experience significant performance degradation. To reduce this effect, we follow a new preamble-based channel estimation approach, where the interference power on each subcarrier is treated as a nuisance parameter which is averaged out from the corresponding likelihood function. The later is then optimized in an iterative manner according to the quasi-Newton algorithm. Furthermore, we address highly-accurate channel estimation in a time-variant channel and propose an iterative interpolation method. Simulation results indicate that our proposed approaches provide more precise estimation performances than those offered by conventional channel estimation methods.
Original languageEnglish
Pages (from-to)1159-1169
Number of pages11
JournalTelecommunication Systems
Volume52
Issue number2
Early online date3 Sep 2011
DOIs
Publication statusPublished - 1 Feb 2013
Externally publishedYes

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