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Guest Editorial. Distributed Broadband Wireless Communications. The impetus for this special issue has been spurred by new technical trends in wireless ...
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 29, NO. 6, JUNE 2011

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Guest Editorial Distributed Broadband Wireless Communications The impetus for this special issue has been spurred by new technical trends in wireless communication and the need for high bit rate ( 1Gbit/s) services in future wireless systems. However, due to the limited transmit power, the wireless transmission distance cannot be too large if the data rate is very high. In order to have a reasonable coverage area for each cell, antennas that are centrally attached to the base station in conventional mobile systems should be distributed throughout the entire cell via optical fiber links so that the wireless transmission distance between mobile terminals and base station antennas can be shortened. Such a system is called a distributed broadband wireless communications (BWC) system. Two keys to implementing the distributed BWC system are distributed antenna systems (DASs) and radio over fiber (RoF) technologies. For DAS implementation, having the mobiles communicating simultaneously with several remote antennas with perfect coordination between these antennas is significant, while crucial to the use of RoF technologies is having small nonlinear distortion and low time delay. Therefore, distributed BWC is important and timely for the move to future broadband wireless mobile systems. To realize distributed BWC, recent technological developments and advancements have to be incorporated. The goal of this JSAC issue is to bring together research contributions that describe original and unpublished work addressing distributed BWC. The Call for Papers attracted 58 submissions worldwide. After a rigorous review process, 19 papers have been selected for publication. The 19 accepted papers are divided into three categories. The first category contains twelve papers, dealing with DASs covering topics such as cell edge performance evaluation, base station coordination, performance comparison between the DAS and other systems, interference mitigation, resource allocation and antenna selection. The second category has six papers, addressing RoF, covering topics including UWB signal transmission over RoF links, and optical network architectures and linearlization techniques to support this, power adaptation and photonic modulator and convertor. The third category has one paper dealing with free-space optical networks by looking at diversity receivers with beam angle and power adaptation for optical wireless systems. The Guest Editors would like to thank all the authors for their submissions, the reviewers for their high-quality reviews and helpful suggestions to the authors on improving the content and presentation of the papers. We would also like to extend our sincere thanks to Professor Pamela Cosman, the past Editor-in-Chief, and Dr. Martha Steenstrup, the current

Editor-in-Chief of IEEE JSAC, for their support and help in bringing forward this special issue. Jiangzhou Wang, Guest Editor University of Kent, United Kingdom Fumiyuki Adachi, Guest Editor Tohoku University, Japan Atlio Gameiro, Guest Editor University of Aveiro, Portugal Nathan J. Gomes, Guest Editor University of Kent, United Kingdom Ken-Ichi Kitayama, Guest Editor Osaka University, Japan Paulo Monteiro, Guest Editor Nokia Siemens Networks, Portugal Mamoru Sawahashi, Guest Editor Tokyo City University, Japan Xiang-Gen Xia, Guest Editor University of Delaware, USA Alberto Leon-Garcia, J-SAC Board Representative

Jiangzhou Wang received his B.S. and M.S. degrees from Xidian University, China, and Ph.D. degree from the University of Ghent, Belgium, in 1990. He is currently a Professor and Head of the Broadband and Wireless Communications Research Group in the University of Kent, England, United Kingdom. From 1995 to 2005, he was with the University of Hong Kong. From 1992 to 1995, he was a Senior System Engineer at Rockwell International Corporation, California, USA. He has published over 200 papers and three books in wireless communications. He is an Editor for IEEE Transactions on Communications and a five-time Guest Editor for IEEE Journal on Selected Areas in Communications. He is also a Guest Editor of the EURASIP Journal on Advances in Signal Processing, IEEE Communications Magazine and IEEE Wireless Communications Magazine. He is IEEE Globecom2011 Workshop Chair and IEEE WCNC2013 Technical Program Chair. He is an Evaluation Expert of the European Commission Framework Program 7 (FP7).

Digital Object Identifier 10.1109/JSAC.2011.110601 c 2011 IEEE 0733-8716/11/$25.00 

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 29, NO. 6, JUNE 2011

Fumiyuki Adachi received the B.S. and Dr. Eng. degrees from Tohoku University, Sendai, Japan, in 1973 and 1984, respectively. In April 1973, he joined NTT. From 1992 to 1999, he was with NTT DoCoMo, where he led a research group on wideband/broadband CDMA wireless access for IMT2000 and beyond. Since January 2000, he has been a Professor in Tohoku University. Dr. Adachi served as a Guest Editor of the JSAC many times. He was a corecipient of the IEEE Vehicular Technology Transactions Best Paper of the Year Award in 1980 and 1990 as well as a recipient of the Avant Garde Award in 2000. He was a recipient of the IEICE Achievement Award in 2002, and a corecipient of the IEICE Transactions Best Paper of the Year Award in 1996, 1998 and 2009. He was a recipient of Thomson Scientific Research Front Award in 2004, Ericsson Telecommunications Award 2008, and Prime Minister Invention Prize 2010. Dr. Adachi is an IEEE Fellow.

Paulo Monteiro received his diploma and his doctoral (PhD) degrees in electronics and telecommunications from the University of Aveiro and the M.Sc. degree from the University of Wales, UK. He is manager of Network Optimization Unit at Nokia Siemens Networks Portugal. He is also Associate Professor at the University of Aveiro and researcher at the Instituto de Telecomunicaes. He has acted as a reviewer of the IEEE Journal of Lightwave Technology, IEE Electronics Letters; ETRI Journal and OSA Journal of Optical Networking (JON); SPIE Optical Engineering. He has participated in several national and European projects and his currently the project coordinator of the Large-scale integrating project FUTON. He has authored/co-authored more than 15 patent applications and over 300 refereed papers and conference contributions.

Atlio Gameiro received his Licenciatura and his PhD from the University of Aveiro in 1985 and 1993 respectively. He is currently a Professor in the University of Aveiro, and a Group Head at the Instituto de Telec., Plo de Aveiro, Portugal. His industrial experience includes a period of one year at BT Labs and one year at NKT Elektronik. He has published over 120 technical papers in international journals and conferences. His current research activities involve space-time-frequency algorithms for the broadband wireless systems, distributed antennas, cross-layer design and cognitive radio. He has been involved and has led several national and European projects in the field of mobile communications. He acted as chairman of the 12th IST Summit in mobile and wireless communications and as a member of the TPC of several international conferences (ICC; PIMRC, VTC).

Mamoru Sawahashi received his B.S. and M.S. degrees from Tokyo University in 1983 and 1985, respectively, and received his Dr. Eng. Degree from the Nara Institute of Technology in 1998. In 1985, he joined the NTT Electrical Communications Laboratories, and in 1992 he transferred to NTT Mobile Communications Network, Inc. (now NTT DOCOMO, Inc.). He was engaged in the research and development of radio access technologies for W-CDMA mobile communications and broadband packet radio access technologies for the 3G longterm evolution (LTE) and for LTE-Advanced in NTT DOCOMO. From April 2006, he assumed the position of Professor of the Department of Information Network Engineering, Tokyo City University. From 2006 to 2009, he has been a part-time director of the Radio Access Development Department of NTT DOCOMO. He has served as a guest editor of the IEEE JSAC multiple times.

Nathan Gomes received the B.Sc. degree from the University of Sussex, U.K., in 1984 and the Ph.D. degree from University College London, London, U.K., in 1988, both in electronic engineering. From 1988 to 1989, he held a Royal Society European Exchange Fellowship at ENST, Paris, France. Since late 1989, he has been with the Department of Electronics, University of Kent, UK, where he is currently a Reader in Broadband Communications. His present research interests include radio-over-fiber systems and networks, the photonic generation and transport of millimeter-wave signals, and photoreceivers for such applications. He has been a lead participant in a number of national and EU projects involving radio-over-fibre and has published extensively in international journals and conferences in this area.

Ken-Ichi Kitayama joined the NTT Laboratory in 1976. During 19821983, he was a Research Fellow with the University of California, Berkeley. In 1995, he joined the Communications Research Laboratory (now the National Institute of Information and Communications Technology, NICT), Tokyo, Japan. Since 1999, he has been a Professor in Osaka University, Japan. He has published more than 210 papers in refereed journals. He is the holder of more than 30 patents. His research interests are in photonic networks, optical signal processing, OCDMA systems, and radio-over-fiber communications. Dr. Kitayama is the Fellow of the IEICE of Japan. He was the recipient of the 1980 Young Engineer Award from the Institute of Electronic and Communication Engineers of Japan, the 1985 Paper Award of Optics from the Japan Society of Applied Physics, the 2004 Achievement Award from the IEICE of Japan, and the 2007 Shida Rinzaburoh Award. Dr. Kitayama is an IEEE Fellow.

Xiang-Gen Xia received the B.S. degree in mathematics from Nanjing Normal University, China, in 1983, the M.S. degree in mathematics from Nankai University, China, 1986, and the Ph.D. degree from the University of Southern California in 1992. Since September 1996, he has been with University of Delaware, Newark, where he is currently the Charles Black Evans Professor. He has seven U.S. patents awarded and is the author of one book. He is currently an Associate Editor of the IEEE Transactions on Signal Processing, and IEEE Transactions on Wireless Communications. He was the General Co-Chair of ICASSP in 2005, and Technical Program Chair of the Signal Processing Symp, Globecom 2007. He received the NSF Faculty Early Career Development (CAREER) Program Award in 1997, the Office of Naval Research (ONR) Young Investigator Award in 1998, the Outstanding Overseas Young Investigator Award of the National Natural Science Foundation of China in 2001, and the Outstanding Junior Faculty Award of the Engineering School of the University of Delaware in 2001. Dr. Xia is an IEEE Fellow.