Signal Processing in Communications
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Signal Processing 84 (2004) 1989–1990 Editorial Signal Processing in Communications With great pleasure I write the foreword for this Special Section on Signal Processing in Commu- nications, containing eight papers originally pre- sented at the Sixth Baiona Workshop on Signal Processing in Communications, held in Baiona (Spain) in September 2003. These papers are the final result of a process which started with a first selection by members of the Technical Committee, submission of extended versions and a review process according to the standard procedure for peer reviewing in Signal Processing. The permanent battle for increasing the trans- mission rates requires the use of exquisite signal processing skills to give adequate responses to scenarios more demanding than ever: time and frequency selective channels, fully digital multi- purpose receivers, adjacent users posing high interference levels, etc. In this context, low- complexity, possibly iterative solutions are parti- cular interesting. This is the main motivation for H. Schoeneich and P.A. Hoeher in ‘‘Iterative Semi-Blind Single-Antenna Cochannel Interfer- ence Cancellation and Tight Lower Bound for Joint Maximum-Likeihood Sequence Estima- tion’’, where they present a surprising one-antenna based interference canceller which does not need training sequences from the interfering sources. In ‘‘Partial Crosstalk Precompensation in Downstream VDSL’’, a paper of significant engineering practical value, R. Cendrillon, G. Ginis, M. Moonen and K.V. Acker make use of the power of precoding to cancel out most of the crosstalk interference in a VDSL system keeping an excellent complexity-performance tra- deoff. Channel equalization and identification are classical topics which are always a source of novel results. In our case, D. Darsena, G. Gelli, L. Paura and F. Verde, in ‘‘Subspace-based Blind Channel Identification of SISO-FIR Systems with Impro- per Random Inputs’’, use second-order statistics to blindly identify non-minimum phase channels, provided that the source verify some properties that are found in certain cases of practical interest. In the context of the promising multi-carrier spread-spectrum modulation, T. Bianchi, F. Argenti and I. Giannini analyze a channel estimation scheme in ‘‘Data-aided Channel Estima- tion for MC-CDMA Systems with Transmit Diversity in Wireless Channels’’, applicable for several transmitting antennas. Also for multi- carrier systems, the problem of equalization under severe time and frequency selectivity conditions is tackled in ‘‘Time-Domain and Frequency-Domain Per-Tone Equalization for OFDM over Doubly- Selective Channels’’, by I. Barhumi, G. Leus and M. Moonen. In this case intrasymbol channel variation is present on top of the frequency selectivity; inter-carrier interference is created as a result, and both time and frequency domain equalizers are necessary. With respect to ancillary tasks such as synchro- nization, some of the new challenges posed by multi-purpose receivers are analyzed in ‘‘Multi- rate Receivers with IF Sampling and Digital Timing Correction’’, by H. Wymeersch and M. Moeneclaey. Both offer a solid analytical founda- tion with good insight into the practical details. A more theoretical study focused on the application of Bayesian methods by using particle filtering ARTICLE IN PRESS www.elsevier.com/locate/sigpro 0165-1684/$ - see front matter r 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.sigpro.2004.07.011
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Transcript of Signal Processing in Communications
ARTICLE IN PRESS
0165-1684/$ - se
doi:10.1016/j.sig
Signal Processing 84 (2004) 1989–1990
www.elsevier.com/locate/sigpro
Editorial
Signal Processing in Communications
With great pleasure I write the foreword for thisSpecial Section on Signal Processing in Commu-nications, containing eight papers originally pre-sented at the Sixth Baiona Workshop on SignalProcessing in Communications, held in Baiona(Spain) in September 2003. These papers are thefinal result of a process which started with a firstselection by members of the Technical Committee,submission of extended versions and a reviewprocess according to the standard procedure forpeer reviewing in Signal Processing.The permanent battle for increasing the trans-
mission rates requires the use of exquisite signalprocessing skills to give adequate responses toscenarios more demanding than ever: time andfrequency selective channels, fully digital multi-purpose receivers, adjacent users posing highinterference levels, etc. In this context, low-complexity, possibly iterative solutions are parti-cular interesting. This is the main motivation forH. Schoeneich and P.A. Hoeher in ‘‘IterativeSemi-Blind Single-Antenna Cochannel Interfer-ence Cancellation and Tight Lower Boundfor Joint Maximum-Likeihood Sequence Estima-tion’’, where they present a surprising one-antennabased interference canceller which does notneed training sequences from the interferingsources. In ‘‘Partial Crosstalk Precompensationin Downstream VDSL’’, a paper of significantengineering practical value, R. Cendrillon,G. Ginis, M. Moonen and K.V. Acker make useof the power of precoding to cancel out most ofthe crosstalk interference in a VDSL systemkeeping an excellent complexity-performance tra-deoff.
e front matter r 2004 Elsevier B.V. All rights reserve
pro.2004.07.011
Channel equalization and identification areclassical topics which are always a source of novelresults. In our case, D. Darsena, G. Gelli, L. Pauraand F. Verde, in ‘‘Subspace-based Blind ChannelIdentification of SISO-FIR Systems with Impro-per Random Inputs’’, use second-order statistics toblindly identify non-minimum phase channels,provided that the source verify some propertiesthat are found in certain cases of practical interest.In the context of the promising multi-carrierspread-spectrum modulation, T. Bianchi, F.Argenti and I. Giannini analyze a channelestimation scheme in ‘‘Data-aided Channel Estima-tion for MC-CDMA Systems with TransmitDiversity in Wireless Channels’’, applicable forseveral transmitting antennas. Also for multi-carrier systems, the problem of equalization undersevere time and frequency selectivity conditions istackled in ‘‘Time-Domain and Frequency-DomainPer-Tone Equalization for OFDM over Doubly-Selective Channels’’, by I. Barhumi, G. Leus andM. Moonen. In this case intrasymbol channelvariation is present on top of the frequencyselectivity; inter-carrier interference is created as aresult, and both time and frequency domainequalizers are necessary.With respect to ancillary tasks such as synchro-
nization, some of the new challenges posed bymulti-purpose receivers are analyzed in ‘‘Multi-rate Receivers with IF Sampling and DigitalTiming Correction’’, by H. Wymeersch and M.Moeneclaey. Both offer a solid analytical founda-tion with good insight into the practical details. Amore theoretical study focused on the applicationof Bayesian methods by using particle filtering
d.
ARTICLE IN PRESS
Editorial / Signal Processing 84 (2004) 1989–19901990
tools to joint estimation and decoding is thepurpose of ‘‘A Sequential Monte-Carlo Techniquefor Blind Synchronization and Detection inFrequency-Flat Rayleigh Fading Wireless Chan-nels’’, by J. Mıguez, T. Ghirmai, M. Bugallo andP.M. Djuric.Finally, the importance of source coding and the
relevance of the new standards on image compres-sion is present in this Special Section. In ‘‘Analysisof Joint Predictive-Transform Coding for StillImage Compression’’, L. Cappellari and G.A.Mian present an analysis of the H.264/AVCintraframe coding paradigm.
We hope to have a new Baiona Workshopas least as successful as the last one in two-yearstime. For futher information, visit http://www.baionaworkshop.org, the permanent site of theBaiona Workshop series.
Guest Editor
Carlos MosqueraDpt. Teorıa de la Senal y Comunicaciones,
Universidad de Vigo, 36200 Vigo, Spain
E-mail address: [email protected]
