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This article is part of the series UWB—State of the Art.

Open Access Research Article

Principles and Limitations of Ultra-Wideband FM Communications Systems

John FM Gerrits1*, Michiel HL Kouwenhoven2, Paul R van der Meer3, John R Farserotu1 and John R Long3

Author Affiliations

1 Centre Suisse d'Electronique et de Microtechnique SA, Jaquet-Droz 1, Neuchâtel, CH-2007, Switzerland

2 National Semiconductor BV, Amplifier Design Europe, Delftech Park 19, Delft 2628 XJ, The Netherlands

3 Electronics Research Laboratory/DIMES, Faculty of Electrical Engineering, Mathematics and Computer Science (EEMCS), Delft University of Technology, Mekelweg 4, Delft 2628 CD, The Netherlands

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EURASIP Journal on Advances in Signal Processing 2005, 2005:189150  doi:10.1155/ASP.2005.382

The electronic version of this article is the complete one and can be found online at: http://asp.eurasipjournals.com/content/2005/3/189150


Received:10 October 2003
Revisions received:7 March 2004
Published:17 March 2005

© 2005 Gerrits et al.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

This paper presents a novel UWB communications system using double FM: a low-modulation index digital FSK followed by a high-modulation index analog FM to create a constant-envelope UWB signal. FDMA techniques at the subcarrier level are exploited to accommodate multiple users. The system is intended for low (1–10 kbps) and medium (100–1000 kbps) bit rate, and short-range WPAN systems. A wideband delay-line FM demodulator that is not preceded by any limiting amplifier constitutes the key component of the UWBFM receiver. This unusual approach permits multiple users to share the same RF bandwidth. Multipath, however, may limit the useful subcarrier bandwidth to one octave. This paper addresses the performance with AWGN and multipath, the resistance to narrowband interference, as well as the simultaneous detection of multiple FM signals at the same carrier frequency. SPICE and Matlab simulation results illustrate the principles and limitations of this new technology. A hardware demonstrator has been realized and has allowed the confirmation of theory with practical results.

Keywords:
UWB; FM; FDMA; WPAN; subcarrier; multipath

Research Article