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Advanced Multicarrier Waveforms and Mechanisms for Future Ad-Hoc and Cell-Based Systems

Full day workshop

Recently, there has been a growing interest in design and development of cognitive radio technology to go beyond the problem of spectrum scarcity resulting from the conventional command and control style fixed spectrum allocation.

Moreover, with the availability of opportunistic spectrum access, future communication and digital broadcasting systems will be able to dynamically and locally vary their operating spectrum over a wide range of frequencies, and access available portions of the spectrum on a temporal basis. This may happen either upon instruction from a cognitive base station or independently by devices themselves.

Many efforts are currently in progress to develop and validate new access mechanisms, architecture and business models that are needed for realizing flexible access to these new spectrum opportunities. Extensive efforts for realizing TV white space (TVWS) applications and development of new broadband data services for Professional Mobile Radio (PMR) within the frequency allocation for the current narrowband systems are examples of the new opportunities that the efficient use of spectrum is likely provide. In this context, co-existence with and protection of the systems sharing the spectrum is of extreme importance.

OFDM scheme is the most common multicarrier technique that is considered by several communication standards, including the IEEE 802.22 cognitive radio standard exploiting the unused TV bands for unlicensed wireless regional area network (WRAN) operation. However, the large frequency domain sidelobes of the OFDM signal produce high mutual interference to the adjacent licensed systems due to the lack of the synchronization. Moreover, OFDM utilizes the cyclic prefix (CP) to combat the effects of the multipath propagation which reduces the overall spectral efficiency. Various enhancements of OFDM have been considered in the literature to overcome its limitations. Additionally, the mentioned limitations have motivated the study of alternative multicarrier waveforms, such as filterbank based multicarrier schemes (FB-MC).

The use of spectrally well-contained subcarrier frequency responses provides a major improvement in spectrum efficiency and relaxes limitations for system cohabitation. In response to the above, this workshop aims to gather researchers, engineers and practitioners both from academia and industry as well as end users, with the aim to inspire the analysis and development of new solutions for both TVWS and narrow band system coexistence, and to present advanced flexible multicarrier waveform transmission techniques, platforms, and applications.

Invited Talks

Maurice Bellanger, CNAM (Conservatoire National des Arts et Métiers), Paris-France, Filter Banks in Communications: Challenges and Perspectives

After the successful deployment of digital transmultiplexers at the interface of analogue and digital networks in the early eighties, one would have expected more applications of filter bank techniques in the communication systems to come. Instead, the multicarrier transmission concept has been implemented with OFDM in all the emerging applications: digital broadcasting, ADSL, PLC, local area wireless networks and cellular networks. Why communication equipment developers and network operators are so reluctant to use filter bank based techniques?
In the talk, three obstacles to the use of filter banks in communications are discussed, namely delay, equalization and complexity in both concept and computations. Two approaches, FBMC/OQAM and FMT/QAM, are compared and contrasted in that respect. To conclude, suggestions are offered to help get the support of standardization groups and gain acceptance by decision makers in industry and network operation.

Biography: Maurice Bellanger graduated from ENST (Ecole Nationale Supérieure des Télécommunications), Paris, in 1965 and received the doctorate degree from the university of Paris in 1981. He joined the company Philips Communications in France in 1967 and, since then, he has worked on digital signal processing and applications in telecommunications. In 1991, he joined CNAM (Conservatoire National des Arts et Métiers), a public education and research institute, as a professor of electronics. He is now emeritus professor. From 2008 to 2010, he was the coordinator of the European Research FP7-project “Physical Layer for Dynamic Spectrum Access and Cognitive Radio”-PHYDYAS (http://www.ict-phydyas.org/). Elected a Fellow member of the IEEE in 1984, for contributions to the theory of digital filtering and the applications to communication systems, he was the technical program chairman of the conference ICASSP’82 in Paris. He was the president of EURASIP, the European Association for Signal Processing, from 1987 to 1994 and the chairman of the France section of URSI (Union Radio Scientifique Internationale) from 2006 to 2008. He is a member of the French Academy of Technology.

 

 

Pierre Siohan, Orange Lab, Rennes-France, FBMC: An Idea Whose Time Has Come

In the famous paper: “Multicarrier modulation for data transmission: An idea whose time has come”, the author refers to conventional OFDM and also to multicarrier modulation based on offset (or staggered) QAM. Actually, in 1990 OFDM was already there with wireless (DAB) and wired (DSL) transmission systems and, since then, has known a tremendous success. At the contrary, all OFDM variants, today known as Filter Bank Multi-Carrier (FBMC) systems, are still marginal from a standardization and industrial point of view. However, with the OFDM/OQAM/IOTA proposal, the paper by Le Floch et al. in 1995 has renewed the interest for enhanced multicarrier systems. The talk will propose an overview of the impressive progresses that are being made since that time to get very competitive FBMC systems. Then, we will focus on some features of FBMC that still deserve a particular attention. Among those, are FBMC flexibility, packet transmission and efficient equalization.

Biography: Pierre Siohan (IEEE SM 1999) received the PhD degree from the École Nationale Supérieure des Télécommunications (ENST), Paris, France, in 1989. In 1977 he joined the Centre Commun d’Études de Télédiffusion et Télécommunications (CCETT), Rennes, where his activities were first concerned with the communication theory and its application to the design of broadcasting systems. Afterwards, he was in charge of the CCETT Mathematical and Signal Processing Group.  From September 2001 to September 2003, he took a two-year sabbatical leave, being directeur de recherche with the Institut National de Recherche en Informatique et Automatique (INRIA), Rennes. Now, he his Expert in Networks and Telecom at Orange. His current research interests are in signal processing for communication, especially for radio and power line communication systems. Dr. Siohan has authored 31 papers in refereed international journals, 30 patents and 90 papers in international conferences. Recently, he was a guest editor of the special issue on “Filter Banks for Cognitive Next Generation Multicarrier Wireless Communications,” which appeared in EURASIP ASP journal.

 

 

Andrea M. Tonello, University of Udine, Udine-Italy, What’s Next and Why on Filter Bank Modulation? From Concatenated FMT to Cyclic Block FMT

Multicarrier modulation is enjoying great success in state-of-the-art physical layer wireless and wireline (e.g., power line communications) technologies. The most popular architecture is orthogonal frequency division multiplexing (OFDM). Aiming at increasing spectral efficiency, more general architectures based on filter bank modulation (FBM) have been proposed. This talk offers an overview of some recent advances and results about FBM trying to motivate the reasons why there is still space to devise interesting FBM digital architectures for application in multiple access asynchronous channels (both wireless and power line) affected by doubly dispersive fading and various non-idealities. In particular, focus will be given to Filtered Multitone Modulation (FMT) and novel schemes, namely, concatenated OFDM-FMT, MIMO Precoded FMT, Hybrid FMT, and Cyclic Block FMT. The application of such solutions is motivated by multiple ambitious objectives: the robustness not only to channel impairments but also to hardware limitations (FMT), the orthogonalization of the uplink channel (Concatenated FMT), the high capacity in MIMO frequency selective channels (Precoded FMT), the agile use of spectrum and the flexible adaptation of available resources (Hybrid FMT), the overall reduced latency/complexity and increased performance with  simple orthogonal filter bank design (Cyclic Block FMT). The main features of such schemes will be described and illustrative examples of performance will be given.

Biography: Andrea M. Tonello is an Aggregate Professor at the University of Udine, Italy (since 2003) where he leads the Wireless and Power Line Communication Lab. He is also the founder and president of WiTiKee, a university spin-off company. From 1997 to 2002 he has been with Bell Labs Lucent Technologies firstly as a Member of Technical Staff and then as a Technical Manager at the Advanced Wireless Technology Laboratory, Whippany, NJ and the Managing Director of the Bell Labs Italy division. He obtained the Laurea degree (1996) and the Doctor of Research degree in electronics and telecommunications (2003) from the University of Padova, Italy. Dr. Tonello received several recognitions among which the Lucent Bell Labs Recognition of Excellence award (1999) , the Distinguished Visiting Fellowship from the Royal Academy of Engineering, UK (2010) and the Distinguished Lecturer Award by the IEEE Vehicular Technology Society (2011-13 and 2013-15). He also received (as co-author) five best paper awards.
He is the Vice-chair of the IEEE Communications Society Technical Committee on Power Line Communications. He serves/ed as an Associate Editor for the IEEE Transactions on Vehicular Technology (2007-2013), for the IEEE Transactions on Communications (2012-TD) and IEEE Access (2013-TD). Web site: www.diegm.uniud.it/tonello

 

Final Program

  • 09:00 - 09:30 (Invited talk): "Filter Banks in Communications: Challenges and Perspectives", Maurice Bellanger (CNAM - Conservatoire National des Arts et Métiers, Paris-France)
  • 09:30 - 09:50: "Timing Offset Compensation in Fast-Convolution Filter Bank Based Waveform Processing", Markku K. Renfors (Tampere University of Technology, Finland); Juha Yli-Kaakinen (Tampere University of Technology, Finland)
  • 09:50 - 10:10: "Analysis of the nonlinear spectral re-growth in FBMC systems for cognitive radio context", Saidou Sall (Paris-Est Marne-la Valée University, France); Hmaied Shaiek (CNAM, France); Daniel Roviras (CNAM, France); Yahia Medjahdi (CNAM, France).
  • 10:50 - 11:20 (Invited talk):  "FBMC: An Idea Whose Time Has Come", P. Siohan, Orange Lab, Rennes-France
  • 11:20 - 11:40: "Preamble Design for Channel Estimation in OFDM/OQAM Cooperative Systems", Christos Mavrokefalidis (University of Patras, Greece); Eleftherios Kofidis (University of Piraeus, Greece); Athanasios A. Rontogiannis (National Observatory of Athens, Greece); Sergios Theodoridis (University of Athens, Greece).
  • 11:40 - 12:00: "Low feedback downlink MIMO channel estimation for distributed FBMC systems using SNR measurements", Jerome Louveaux (Université Catholique de Louvain, Belgium); François Horlin (Université Libre de Bruxelles, Belgium); Andre Bourdoux (IMEC, Belgium).
  • 13:40 - 14:10 (Invited Talk): "What’s Next and Why on Filter Bank Modulation? From Concatenated FMT to Cyclic Block FMT", A. M. Tonello, University of Udine, Italy
  • 14:10 - 14:30: "Comparison of linear and widely linear processing in MIMO-FBMC systems", Màrius Caus (Universitat Politècnica de Catalunya (UPC), Spain); Ana Perez-Neira (Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) and Universitat Politècnica de Catalunya (UPC), Spain).
  • 14:30 - 14:50: "On interference cancellation in Alamouti coding scheme for filter bank based multicarrier systems", Rostom Zakaria (CNAM, France); Didier Le Ruyet (CNAM, France). 
  • 14:50 - 15:10: "EM based Per-Subcarrier ML Channel Estimation for Filter Bank Multicarrier Systems", Leonardo Gomes Baltar (Technische Universität München, Germany); Amine Mezghani (Technische Universität München ,Germany); Josef A. Nossek (Technische Universität München, Germany)
  • 15:40 -16:00: "Non-uniform FBMC - A pragmatic approach", Sladjana Josilo (Faculty of Technical Sciences, UNS, Serbia); Milos Pejovic (Faculty of Technical Sciences, UNS, Serbia); Slobodan Nedic (Faculty of Technical Sciences, University of Novi Sad, Serbia).
  • 16:00 - 16:20: "Link Performance Model for System Level Simulations of Filter Bank Multicarrier-Based Systems in PMR Networks", Alexandra Oborina (CTTC, Spain); Christian Ibars (Centre Tecnològic de Telecomunicacions de Catalunya - CTTC, Spain); Lorenza Giupponi (Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Spain); Faouzi Bader (SUPELEC, France)
  • 16:20 - 16:40: "Time and frequency synchronization for downlink CoMP with FBMC", Nicolas Cassiau (CEA-Leti Minatec, France); Dimitri Kténas (CEA, France); Jean-Baptiste Doré (CEA, France).
  • 16:40 - 17:00: "Link to System Mapping for FBMC Based Systems in SISO case", Dmitry Petrov (Magister Solutions Ltd. & University of Juväskylä, Finland); Tobias Hidalgo Stitz (Magister Solutions Ltd., Finland); Pavel Gonchukov (University of Juväskylä, Finland).


 

EMPhATIC Project is a Small and Medium-scale focused Research Project (STREP) supported by the 7th Framework Programme.

Contract number: 318362
Project duration: 01/09/2012 – 01/03/2015 (30 months)