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ThinkMind // International Journal On Advances in Telecommunications, volume 3, numbers 1 and 2, 2010 // View article tele_v3_n12_2010_1


Narrowband Interference Suppression for MIMO MB-OFDM UWB Communication Systems

Authors:
Georgi Iliev
Zlatka Nikolova
Vladimir Poulkov
Miglen Ovtcharov

Keywords: Narrowband interference (NBI); Multiband orthogonal frequency-division multiplexing (MB-OFDM); Multiple-input multiple-output (MIMO); Ultrawideband (UWB); Variable complex filters; Adaptive complex filter banks.

Abstract:
Ultrawideband (UWB) systems show excellent potential benefits when used in the design of high-speed digital wireless home networks. The constantly-increasing demand for higher data transmission rates can be satisfied by exploiting both multipath- and spatial-diversity, using multiple-input multiple-output (MIMO) together with proper modulation and coding techniques. Unlike conventional MIMO OFDM systems, the performance of MIMO MB-OFDM UWB systems does not depend on the temporal correlation of the propagation channel although narrowband interference (NBI) is still a problem. In this paper we put forward a technique for suppressing NBI by the use of adaptive narrowband filtering. The method is compared experimentally with other algorithms for the identification and cancellation/suppression of complex NBI in OFDM single-band and multiband (MB) UWB systems. The study shows that the different schemes offer slightly differing performances, depending on the parameters of the MIMO UWB system. The proposed complex adaptive narrowband filtering technique is an optimal solution which offers a good balance between NBI suppression efficiency and computational complexity.

Pages: 1 to 8

Copyright: Copyright (c) to authors, 2010. Used with permission.

Publication date: September 5, 2010

Published in: journal

ISSN: 1942-2601

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