García-Armada, Ana

Ghogho, Mounir

Heath Jr., Robert W.

Liang, Ying-Chang

Papadias, Constantinos

Salvekar, Atul

Physical Communication

Name not available

Guest editorial [Special Issue on Advances in MIMO-OFDM]

Universidad Carlos III de Madrid e-Archivo

Guest editorialSpecial issue on Advances in MIMO–OFDMThe combination of Orthogonal Frequency DivisionMultiplexing (OFDM) and Multiple Input – Multiple Out-put (MIMO) techniques is instrumental to achieving thehigh spectral efficiency required for the evolution ofmobile communication systems. The implementation ofMIMO–OFDM systems will require, among others, ad-vances in the design of channel estimation and synchro-The first paper ‘‘Joint Channel and Frequency Offset Esti-mation in MIMO–OFDM Systems with Insufficient CyclicPrefix’’ [1] addresses joint channel and frequency offset es-timation for MIMO–OFDM systems in the presence of InterSymbol Interference and Inter Carrier Interference due toan insufficient CP.The second paper ‘‘CQI Algorithm Design in MIMO Sys-nization techniques to work in fast fading conditions.These techniques in combination with strategies to man-age or limit feedback information and overhead will allowfor the adaptation of the transmitted signal to the changingchannel conditions.MIMO–OFDMsystemswill use cooper-ative communication, through relays, to improve reliabil-ity and extend coverage.The challenges facedwhen implementingMIMO–OFDMin the presence of multiple users increase, but also thebenefits. Multiuser and multi-cell interference arise andresource allocation becomes crucial. Several approacheshave been developed recently to improve the performanceofMIMO–OFDM inmultiuser andmulti-cell environments,enhancing the data rates and/or the expanding the cover-age.The special issue on Advances in MIMO–OFDM wasorganized to highlight and encourage recent advances inthis topic. Each submitted paper was reviewed by expertsin the area. Based on the critical reviews, we selected 7papers to include in this special issue. They all contributeinnovative ideas for the design and implementation ofMIMO–OFDM based transceivers and networks that willmeet the requirements of future generations of mobilecommunications. The first three papers cover the topicsof channel quality estimation and performance prediction.With this information it is possible to perform adaptationat the transmitter, which is the topic of the fourth paper.The final two papers extend this possibility to multiuserand cooperative systems while the last paper proposesphysical layer security techniques for MIMO–OFDM.MIMO–OFDM systems use a cyclic prefix (CP) longerthan the expected channel impulse response to maintainorthogonality at the expense of a small capacity loss. An in-sufficient CP may appear in some wireless scenarios witha very long channel response or in some military applica-tions that suppress the CP to avoid signal identification.tems with Maximum Likelihood Detectors’’ [2] investi-gates the problem of choosing a channel quality indica-tor (CQI) for individual streams in a 2×2 MIMO system,where the goal is to maximize the total throughput whendata is scheduled based on the CQI chosen. Based on aninformation-theoretic analysis, a novel CQI algorithm isproposed and is shown to yield a throughput improvementin High Speed Downlink Packet Access (HSDPA), whereMIMO–OFDM is used.Performance prediction in practicalMIMO–OFDMwire-less links is challengingwhen forward error correction andinterleaving are performed over subcarriers and spatialstreams in frequency/spatial selective channels. Recent re-sults show that the error-rate of coded and bit-interleavedMIMO–OFDM links may be characterized by the postpro-cessing signal-to-noise ratio (SNR), sorted over subcarriers,what is denoted as ordered SNR. The third paper ‘‘Mod-eling Ordered Subcarrier SNR in MIMO–OFDM WirelessLinks’’ [3] establishes fundamental structure of this or-dered SNR, obtaining interesting results that find severalapplications such as high-resolution limited channel feed-back, simpler channel models for system simulation andalgorithm design, and the reduction of dimension in linkquality metrics for link adaptation.Multicast transmission is an attractive way to providecommon information like video simultaneously to multi-ple users. In conventional approaches to multicast, infor-mation is sent either at the most reliable mode of oper-ation supported by the system, or is adapted to the per-formance of the worst user. The fourth paper ‘‘DistributedLink Adaptation for Multicast Traffic in MIMO–OFDM Sys-tems’’ [4] shows how link adaptation can be used in multi-cast transmission to further increase data rates exploitingchannel feedback from the users. It uses a data driven ma-chine learning approach to propose a joint link adaptation1algorithm that provides higher performance than individ-ual adaptation.The fifth paper ‘‘Minimum Bit Error Rate NonlinearPrecoding for Multiuser MIMO and High SNR’’ [5] focuseson the multiuser scenario, where MIMO allows severalusers to be servedwith the same space and time/frequencyresources. Once full channel state information at thetransmitter is available, a precoder is designed to separatethe user signals at the transmitter side, canceling themultiuser interference,with the goal ofminimizing the bit-error-rate for the downlink of a multiuser MIMO system.Cooperative relay networks have been proposed to ex-ploit spatial diversity and improve network performancewith the cooperation ofmultiple single-antenna terminals.With partial or full knowledge of channel state informa-tion, distributed beamforming can efficiently improve thecapacity and reliability of relay networks. The sixth paper‘‘Cooperative Beamforming for OFDM-based amplify-and-forward Relay Networks’’ [6] investigates the cooperativebeamforming design problem for amplify-and-forward re-lay networks that are operating over frequency-selectivechannels using OFDM signaling, with the aim of maximiz-ing the minimum SNR over all subcarriers at the destina-tion, using convex optimization tools.Wireless networks are vulnerable to eavesdroppingdue to their broadcast nature. The way to guaranteesecrecy is currently based on computationally demandingcryptographic algorithms implemented in the upper layersof the communication stack. As an alternative to thesecomplex cryptographic techniques, physical layer securityhas recently emerged as a way to augment the systemsecurity by exploiting the spatio-temporal variations ofthe wireless channel. The seventh paper ‘‘Physical LayerSecurity of MIMO–OFDM Systems by Beamforming andArtificial Noise Generation’’ [7] addresses physical layersecurity in MIMO–OFDM frequency selective wirelesschannels where spatial beamforming and artificial noisebroadcasting are leveraged to secure transmission.In summary, this special issue highlights recent resultsin MIMO–OFDM that pave the way to new applicationsthat can benefit from the multipath resilience and highthroughput offered by these techniques. Lastly, we wouldlike to thank Prof. Ian F. Akyildiz, Editor-in-Chief, andDevaprakash Kothandapani, Journal Manager, for helpingus to organize the special issue. We also thank all authorsand reviewers who contributed to the quality of thepapers. We believe that this special issue is stimulatingand presents a number of challenges and opportunities forfuture work.References[1] C. Prieto del Amo, V.P. Gil Jiménez,M.J. Fernández-Getino García, Jointchannel and frequency offset estimation in MIMO–OFDM systemswith insufficient cyclic prefix, PHYCOM SI-Advances in MIMO–OFDM4 (4) (2011) 254–265.[2] Y. Su, J. Tang, G. Mergen, P. Subrahmanya, L. Xiao, J. Sidi, A.Salvekar, CQI algorithm design in MIMO systems with maximumlikelihood detectors, PHYCOM SI-Advances in MIMO–OFDM 4 (4)(2011) 266–274.[3] R.C. Daniels, R.W. Heath Jr., Modeling ordered subcarrier SNR inMIMO–OFDM wireless links, PHYCOM SI-Advances in MIMO–OFDM4 (4) (2011) 275–285.[4] S. Yun, C. Caramanis, R.W. Heath Jr., Distributed link adaptation formulticast traffic in MIMO–OFDM systems, PHYCOM SI-Advances inMIMO–OFDM 4 (4) (2011) 286–295.[5] D. Castanheira, A. Gameiro, A. Silva, Minimum bit error rate nonlinearprecoding for multiuser MIMO and high SNR, PHYCOM SI-Advancesin MIMO–OFDM 4 (4) (2011) 296–304.[6] W. Cheng, M. Ghogho, Q. Huang, D. Ma, J. Wei, Cooperativebeamforming for OFDM-based amplify-and-forward relay networks,PHYCOM SI-Advances in MIMO–OFDM 4 (4) (2011) 305–312.[7] N. Romero-Zurita, M. Ghogho, D. McLernon, Physical layer securityof MIMO–OFDM systems by beamforming and artificial noisegeneration, PHYCOM SI-Advances in MIMO–OFDM 4 (4) (2011)313–321.Ana García Armada received the Ph.D. degree inelectrical engineering from the Polytechnic Uni-versity of Madrid in February 1998. She is cur-rently an Associate Professor with the Univer-sity Carlos III of Madrid, where she has occu-pied a variety of management positions and isnow acting as Deputy Vice-chancellor of Inter-national Relations. She is leading the Commu-nications Research Group of this university andthe Laboratory of Communication Systems forSecurity and Space in the Scientific Park of thesameuniversity. She has participated in several national and internationalresearch projects related to wireless communications. She is the coau-thor of 8 book chapters on wireless communications and signal process-ing. She has published more than 30 papers in international journals andmore than 50 contributions to international conference proceedings. Shehas contributed to international organizations such as ITU and ETSI. Hermain interests are OFDM and MIMO techniques and their application towireless communications. She has received several awards from Univer-sity Carlos III of Madrid including the Excellence Award to a young re-searcher’s trajectory and the award to Best Practice in lecturing activities.Mounir Ghogho received the M.S. degree in1993 and the Ph.D. degree in 1997 fromthe National Polytechnic Institute of Toulouse,France. He was an EPSRC Research Fellowwith the University of Strathclyde, Glasgow,from September 1997 to November 2001. SinceDecember 2001, he has been a faculty memberwith the school of Electronic and ElectricalEngineering at the University of Leeds, wherehe is currently a Professor. He is also currentlya Professor at the International University ofRabat in Morocco. He served as an Associate Editor of the IEEE SignalProcessing Letters from 2001 to 2004 and the IEEE Transactions onSignal Processing from 2005 to 2008. He also served as a member ofthe IEEE Signal Processing Society SPCOM Technical Committee from2005 to 2010 and is currently a member of the IEEE Signal ProcessingSociety SPTM Technical Committee. He was the general co-chair of theeleventh IEEE workshop on Signal Processing for Advanced WirelessCommunications (SPAWC’2010), the technical co-chair of the MIMOsymposium of IWCMC 2007 and IWCMC 2008, and a technical area co-chair of Eusipco 2008, Eusipco 2009 and ISCCSP’05. He is the generalchair of Eusipco 2013. He was the guest co-editor of the EURASIPJournal on Wireless Communications and Networking special issue on‘‘synchronization for wireless communications’’. His research interestsare in communication and sensor networks, radar imaging and signalprocessing. He was awarded a five-year Royal Academy of EngineeringResearch Fellowship in September 2000.RobertW. Heath Jr. received the Ph.D. degree inelectrical engineering from Stanford Universityin 2002. He is currently an Associate Professorat The University of Texas at Austin. He is alsoPresident and CEO of MIMO Wireless Inc. andVP of Innovation at Kuma Signals LLC. He hasbeen an Editor for the IEEE Transactions onCommunication, an Associate Editor for the IEEETransactions on Vehicular Technology, and leadguest editor for several special issues in journals.He was a member of the IEEE Signal Processing2Society SPCOM Technical Committee. He is Chair of the IEEE COMSOCCommunications Technical Theory Committee. He was a co-author ofseveral best student paper awards at conferences and was co-recipient ofthe 2010 EURASIP Journal on Wireless Communications and Networkingbest paper award. He is the recipient of the David and Doris LybargerEndowed Faculty Fellowship in Engineering. He is a licensed AmateurRadio Operator, a registered Professional Engineer in Texas, and is aFellow of the IEEE.Ying-Chang Liang is a Principal Scientist withthe Institute for Infocomm Research (I2R),Agency for Science, Technology & Research(A*STAR), Singapore. He was a visiting scholar inthe Department of Electrical Engineering, Stan-ford University, CA, USA, from Dec 2002 to Dec2003, and taught graduate courses in NationalUniversity of Singapore from 2004–2009. Hewas elected a Fellow of the IEEE in 2011, andreceived Best Paper Awards from IEEE VTC-Fallin 1999, IEEE PIMRC in 2005, IEEE VTC-Spring in2011, and EURASIP Journal of Wireless Communications and Network-ing in 2010. He also received the Institute of Engineers Singapore (IES)’sPrestigious Engineering Achievement Award in 2007, I2R’s Achiever ofthe Year Award in 2008, and the IEEE Standards Association’s Outstand-ing Contribution Appreciation Award in 2011, for his contributions to thedevelopment of IEEE 802.22, the first worldwide standard based on cog-nitive radio technology.Liang currently serves as Editor-in-Chief of IEEE Journal on SelectedAreas in Communications — Cognitive Radio Series, and Associate Edi-tor of IEEE Transactions on Vehicular Technology. He was an AssociateEditor of IEEE Transactions on Wireless Communications from 2002 to2005, and served as a Guest Editor of five special issues on emergingtopics published in IEEE, EURASIP and Elsevier journals in the past fiveyears. He is currently a Distinguished Lecturer of the IEEE Vehicular Tech-nology Society, and has been a member of the Board of Governors ofthe IEEE Asia-Pacific Wireless Communications Symposium since 2009.He is the Wireless Communication Symposium Chair of 2012 IEEE In-ternational Conference on Communications (ICC’12), and Chair of 2012Thematic Program on random matrix theory and its applications, or-ganized by Institute for Mathematical Sciences, National University ofSingapore.Constantinos Papadias (IEEE SM’03) is a Pro-fessor at Athens Information Technology (AIT),in Athens, Greece, as well the Academic Direc-tor of AIT’s Doctoral Program, which runs in co-operation with Aalborg University in Denmark.He received the Diploma of Electrical Engineer-ing from the National Technical University ofAthens (NTUA) in 1991 and the Doctorate de-gree in Signal Processing (highest honors) fromthe Ecole Nationale Supérieure des Télécommu-nications (ENST), Paris, France, in 1995. He wasa researcher at Institut Eurécom, Stanford University and Bell Labs and anAdjunct Professor at ColumbiaUniversity and CarnegieMellonUniversity.His research interests span several areas of advanced communicationssystems, with emphasis on wireless, cognitive, green and next genera-tion networks. He has published over 130 papers, 5 book chapters, oneedited book, and has received over 3000 citations for his work. His dis-tinctions include the 2002 Bell Labs President’s Award, a Bell Labs Team-work Award, the 2003 IEEE Signal Processing Society’s Young Author BestPaper Award and ESI’s ‘‘most cited paper of the decade’’ citation in thearea of wireless networks in 2006. He has also made standards contribu-tions (most notably as the co-inventor of the Space-Time Spreading (STS)technique that was adopted by the cdma2000 wireless standard for voicetransmission) and holds 12 patents. He is currently the Technical Coordi-nator of two EU FP7 FET research projects: CROWN, in the area of cogni-tive radio systems and HIATUS, in the area of interference alignment. Heis a co-author of the book ‘‘MIMO Communication for Cellular Networks’’which was recently published by Springer.Atul Salvekar received a Ph.D. degree in Electrical Engineering fromStanford University in 2002. He is currently a senior staff/manager atQualcomm.Heworks on all aspects of physical layermodemdesign across2G/3G/4G cellular standards. He is the author of 4 book chapters, 4 journalpapers, 9 conference papers, and 4 patents with several more pending.Ana García ArmadaMounir GhoghoRobert W. Heath Jr.Ying-Chang LiangConstantinos PapadiasAtul Salvekar3

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Guest editorial [Special Issue on Advances in MIMO-OFDM]

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