Plenary Lecture

Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Frequency-Selective Channels

Professor Vyacheslav Tuzlukov
Department of Information and Communication Technologies
School of Electronics Engineering
College of IT Engineering
Kyungpook National University
South Korea
Email: Tuzlukov@ee.knu.ac.kr

Abstract: The generalized receiver (GR) based on a generalized approach to signal processing (GASP) in noise is investigated in a direct-sequence code-division multiple access (DS-CDMA) wireless communication systems with frequency-selective channels. We consider four avenues: linear equalization with finite impulse response (FIR) beamforming filters; channel estimation and spatially correlation; optimal combining; and partial cancellation. We investigate the GR with simple linear equalization and FIR beamforming filters. Numerical results and simulation show that the GR with FIR beamforming filters surpasses in performance the optimum infinite impulse response beamforming filters with conventional receivers, and can closely approach the performance of GR with infinite impulse response beamforming filters. Channel estimation errors are taken into consideration so that DS-CDMA wireless communication system performance will not be degraded under practical channel estimation. GR takes an estimation error of a maximum likelihood (ML) multiple-input multiple-output (MIMO) channel estimation and GR spatially correlation into account in computation of minimum mean square error (MMSE) and log-likelihood ratio (LLR) of each coded bit. The symbol error rate (SER) performance of DS-CDMA employing GR with a quadrature sub-branch hybrid selection/maxmal ratio combining (HS/MRC) scheme for 1-D modulations in Rayleigh fading is obtained and compared with that of conventional HS/MRC receivers. Procedure of selecting a partial cancellation factor (PCF) for the first stage of a hard-decision partial parallel interference cancellation (PPIC) of the GR employed in DS-CDMA wireless communication systems is proposed. A range of optimal PCFs is derived based on the Price's theorem. Computer simulation results show superiority in bit error rate (BER) performance that is very close to that potentially achieved and surpases the BER performance of the real PCF for DS-CDMA systems discussed in literature.

Brief Biography of the Speaker: Vyacheslav Tuzlukov received the MSc and PhD degrees in radio physics from the Belorussian State University, Minsk, Belarus in 1976 and 1990, respectively. From 2000 to 2002 he was a Visiting Professor at the University of Aizu, Japan and from 2003 to 2007 served as an Invited Professor at the Ajou University, Suwon, South Korea, within the Department of Electrical and Computer Engineering. Since March 2008 to February 2009 he joined as Full Professor at the Yeungnam University, Gyeonsang, South Korea within the School of Electronic Engineering, Communication Engineering, and Computer Science. From March 2009 he has been a Full Professor of the Department of Communication and Information Technologies, School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, South Korea. His research emphasis is on signal processing in radar, wireless communications, wireless sensor networks, remote sensing, sonar, satellite communications, mobile communications, and other signal processing systems. He is the author over 200 journal and conference papers, seven books in signal processing area published by Springer-Verlag and CRC Press, some of them are Signal Detection Theory (2001), Signal Processing Noise (2002), Signal and Image Processing in Navigational Systems (2005), Signal Processing in Radar Systems (2012), Editor of the forthcoming book Communication Systems: New Research (2013), and has also contributed Chapters “Underwater Acoustical Signal Processing” and “Satellite Communications Systems: Applications” to Electrical Engineering Handbook: 3rd Edition, 2005; “Generalized Approach to Signal Processing in Wireless Communications: The Main Aspects and Some Examples” to Wireless Communications and Networks: Recent Advances, InTech, 2012; “Wireless Communications: Generalized Approach to Signal Processing”, to Communication Systems: New Research: Nova Publisher, Inc., USA, 2013, and “Radar Sensor Detectors for Vehicle Safety Systems” to Autonomous Vehicles: Intelligent Transport Systems and Automotive Technologies, Nova Publisher, Inc., USA, 2013. He participates at the major International Conferences and Symposia on signal processing as the Keynote Speaker, Plenary Lecturer, Chair of Sessions, Tutorial Instructor and organizes Special Sections. Dr. Tuzlukov was highly recommended by U.S. experts of Defense Research and Engineering (DDR&E) of the United States Department of Defense as a recognized expert in the field of humanitarian demining and minefield sensing technologies and had been awarded by Special Prize of the United States Department of Defense in 1999 Dr. Tuzlukov is distinguished as one of the leading achievers from around the world by Marquis Who’s Who and his name and biography have been included in the Who’s Who in the World, 2006-2012; Who’s Who in World, 25th Silver Anniversary Edition, 2008, Marquis Publisher, NJ, USA; Who’s Who in Science and Engineering, 2006-2012 and Who’s Who in Science and Engineering, 10th Anniversary Edition, 2008-2009, Marquis Publisher, NJ, USA; 2009-2010 Princeton Premier Business Leaders and Professionals Honours Edition, Princeton Premier Publisher, NY, USA; 2009 Strathmore’s Who’s Who Edition, Strathmore’s Who’s Who Publisher, NY, USA; 2009 Presidental Who’s Who Edition, Presidental Who’s Who Publisher, NY, USA; Who’s Who among Executives and Professionals, 2010 Edition, Marquis Publisher, NJ, USA; Who’s Who in Science and Engineering, 2011-2012, Marquis Publisher, NJ, USA; 2011/2012 Strathmore’s Professional Who’s Who Registry among Executives, Professionals, & Entreprenuers, Strathmore’s Who’s Who Publisher, NY, USA; 2011/2012 Edition of Distinguished Professionals On-line, Marquis Publisher, NJ, USA; Who’s Who in Asia 2012, 2nd Edition, Marquis Publisher, NJ, USA. Phone: +82-53-950-5509.

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