Electrical and Computer Engineering
Center for Multimedia Communication
Houston Chapter IEEE Circuits and Systems Society
Professor of Communications Engineering
University of Oulu, Finland
Multiuser Spatial Resource Allocation and Frequency Scheduling for Evolving Cellular Communications
Friday, December 6, 2013
to 4:00 PM
1049 George R. Brown Hall
6100 Main St
Houston, Texas, USA
We consider the multiuser spatial resource allocation and frequency scheduling problems for 3GPP Long Term Evolution – Advanced (LTE-A) type cellular systems. In the first part, we focus on the frequency allocation problem in single-input single-out put (SISO) LTE-A type uplink with carrier aggregation (CA). The increased bandwidth in LTE-A system allows orthogonal allocation of subcarriers among users. We consider both consecutive and distributed frequency allocation strategies with per user transmit power constraints and more realistic power amplifier models accounting for the dependence of the amplifier efficiency on the frequency allocation. A novel binary integer programming with water-filling power allocation is proposed for consecutive frequency allocation. The system level performance is evaluated via computer simulations. The results shed light to the problem of frequency allocation with real user devices both from theoretical and practical points of view.
In the second part, we look more at iterative joint scheduling algorithms for cooperative multi-cell multi-user (MU) multiple-input multiple-output (MIMO) transmission scheme with the sum rate maximization objective for the cell-edge users. We propose an iterative scheduling scheme, which selects the users in each coordinating base station (BS) by considering the mutual interference among the chosen sets. At first, the static user selection (S-US) scheme is discussed, which performs the user selection in a centralized way from the users associated with each BS statically. Following that, we study the performance of the scheduling scheme, namely coordinated user selection (C-US) scheme, which performs scheduling of users and the associated BS so as to maximize the sum rate. In the C-US scheme, the users are linked dynamically to a BS by the C-US algorithm. The sum rate performance is discussed for the proposed algorithms with the precoders designed using either with zero-forcing (ZF) beamforming (BF) or weighted minimum mean squared error (W-MMSE) scheme. The realization of the spatial processing optimization on real computation hardware is also discussed.
Biography of Markku Juntti:
Markku Juntti received his M.Sc. (Tech.) and Dr.Sc. (Tech.) degrees in Electrical Engineering from University of Oulu, Oulu, Finland in 1993 and 1997, respectively.
Dr. Juntti was with University of Oulu in 1992–98. In academic year 1994–95, he was a Visiting Scholar at Rice University, Houston, Texas. In 1999–2000, he was a Senior Specialist with Nokia Networks. Dr. Juntti has been a professor of communications engineering at University of Oulu, Department of Communication Engineering (DCE) and Centre for Wireless Communications (CWC) since 2000. His research interests include signal processing for wireless networks as well as communication and information theory. He is an author or co-author in some 350 papers published in international journals and conference records as well as in book WCDMA for UMTS and Signal Processing Handbook. Dr. Juntti is also an Adjunct Professor at Department of Electrical and Computer Engineering, Rice University, Houston, Texas, USA.
Dr. Juntti is an Editor of IEEE Transactions on Communications and was an Associate Editor for IEEE Transactions on Vehicular Technology in 2002–2008. He was Secretary of IEEE Communication Society Finland Chapter in 1996–97 and the Chairman for years 2000–01. He has been Secretary of the Technical Program Committee (TPC) of the 2001 IEEE International Conference on Communications (ICC 2001), and the Co-Chair of the Technical Program Committee of 2004 Nordic Radio Symposium and 2006 IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2006), and the General Chair of 2011 IEEE Communication Theory Workshop (CTW 2011). He serves as Co-Chair of the Signal Processing for Communications Symposium of GLOBECOM 2014. He is a Senior Member of IEEE.