Open Access

Wideband Impulse Modulation and Receiver Algorithms for Multiuser Power Line Communications

EURASIP Journal on Advances in Signal Processing20072007:096747

https://doi.org/10.1155/2007/96747

Received: 8 November 2006

Accepted: 23 March 2007

Published: 21 June 2007

Abstract

We consider a bit-interleaved coded wideband impulse-modulated system for power line communications. Impulse modulation is combined with direct-sequence code-division multiple access (DS-CDMA) to obtain a form of orthogonal modulation and to multiplex the users. We focus on the receiver signal processing algorithms and derive a maximum likelihood frequency-domain detector that takes into account the presence of impulse noise as well as the intercode interference (ICI) and the multiple-access interference (MAI) that are generated by the frequency-selective power line channel. To reduce complexity, we propose several simplified frequency-domain receiver algorithms with different complexity and performance. We address the problem of the practical estimation of the channel frequency response as well as the estimation of the correlation of the ICI-MAI-plus-noise that is needed in the detection metric. To improve the estimators performance, a simple hard feedback from the channel decoder is also used. Simulation results show that the scheme provides robust performance as a result of spreading the symbol energy both in frequency (through the wideband pulse) and in time (through the spreading code and the bit-interleaved convolutional code).

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Authors’ Affiliations

(1)
Dipartimento di Ingegneria Elettrica, Gestionale, e Meccanica (DIEGM), Università di Udine

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Copyright

© Andrea M. Tonello. 2007

This article is published under license to BioMed Central Ltd. 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.