Principal Scientist
Cognitive Radio
Contact
I have been with Nokia since late 1992, first with Nokia Telecommunications, and since 1994 with Nokia Research Center in Helsinki, Finland and in Irving, TX. My early work was related to multiuser receivers in CDMA systems. Since 1998 my interests have focused on signal processing and optimization aspects of multi-antenna transceivers and systems, in particular for 3G wireless systems. Currently, I am the Nokia representative in an EU STREP project called MASCOT (see http://www.ist-mascot.org), related to multiuser MIMO and relay network research. I used to be a mathematician, having graduated with MSc in Applied Mathematics from the University of Helsinki in 1992. Later, I obtained a DSc degree in Computer Science and Engineering from Helsinki University of Technology.
More than 50 granted patents (see my US patents)
Patents are mostly related to space-time coding, MIMO, multiuser receivers (multiuser detection and chip equalization), beamforming, etc
A. Hottinen, T. Heikkinen, "Distributed subchannel assignment in an OFDMA relay," Proc. Valuetools '07, Nantes, France, October 2007 (to appear).
T. Heikkinen, A. Hottinen, "Distributed subchannel assignment in a multiuser MIMO relay," Proc. Gamecomm '07, Nantes, France, October 2007 (to appear)
A. Hottinen, T. Heikkinen, "Delay-differentiated scheduling in a randomized MIMO relay network," Proc. EUSIPCO 2007, Poznan, Poland, Sept. 2007
A. Hottinen, T. Heikkinen, "Optimal subchannel assignment in a two-hop OFDM relay," Proc IEEE SPAWC, Helsinki, Finland, June 2007
A. Hottinen, Y. Hong, E. Viterbo, C. Mehlfuhrer and C. F. Mecklenbräuker, "A comparison of high rate algebraic and non-orthogonal STBCs,"
Proc. ITG/IEEE Workshop on Smart Antennas WSA 2007, Vienna, Austria, February 2007
A. Hottinen, T. Heikkinen, "Subcarrier allocation in a multiuser MIMO channel using linear programming" (invited paper) proc. EUSIPCO 2006, Florence, Italy, Sept. 2006
A. Hottinen, K. Hugl, C. Zhang, M. Kuusela and B.Raghothaman, "Industrial embrace of smart antennas and MIMO," IEEE Wireless Communications, August 2006, Vol. 13 No. 4
K. Doppler, A. Hottinen,"Multi-antenna relay nodes in OFDM systems," In Proc. ISWSC, Portugal, 2006
A. Hottinen, T. Heikkinen, "Channel assignment in multi-antenna OFDM systems" Proc. European Wireless, Athens, Greece, April 2006
A. Hottinen, T. Heikkinen, "Scheduling in a randomized relay network", Proc. 40th Annual Conference on information sciences and systems (CISS)}, Princeton, NJ, USA, March 2006
A. Hottinen, T. Heikkinen, "Subchannel assignment in OFDM relay nodes", Proc. 40th Annual Conference on information sciences and systems (CISS), Princeton, NJ, USA, March 2006
T. Riihonen, K. Doppler, A. Hottinen, "Performance of spatially distributed large interference relay networks," Proc. IZS 2006, Zurich, Switzerland, Feb 22-24, 2006
K. Doppler and A.Hottinen, "Integration of amplify and forward relays in an OFDM network," in Proc Asilomar Conference, Calif., USA, Nov. 2005
A. Hottinen, "Space-time retransmission in a time-selective channel" in Proc. 39th Annual Conference on information sciences and systems (CISS), Baltimore, MD USA, March 2005
T.Heikkinen, T. Karageorgos and A. Hottinen, "Distributed scheduling in a wireless network," Proc. IEEE VTC 2005, Stockholm, Sweden, May 2005
T. Heikkinen, T. Karageorgos, A. Yao and A.Hottinen,"Delay-differentiated scheduling in a wireless network," Proc. IEEE VTC 2005, Stockholm, Sweden, May 2005
A. Hottinen,"Matrix-modulated closed-loop MIMO with multiuser scheduling," in Proc. CISS 2004, Princeton, NJ USA, March 2004
A. Hottinen and O. Tirkkonen, "Precoder designs for high rate space--time block codes," in Proc. CISS 2004, Princeton, NJ USA, March 2004
A. Hottinen, "Channel reciprocity for FDD systems using duplex hopping," in Proc. URSI convention on Radio Science, Nov. 2004 (On-line proceedings)
A. Hottinen and O. Tirkkonen, "Non-orthogonal space-time block code with symbol rate two," In Proc. CISS 2002, Baltimore, MD, USA, March 2002
A. Hottinen, K. Kuchi and O. Tirkkonen, "A space-time coding concept for a multi-antenna transmitter," in Proc. Canadian Workshop on Information Theory, Vancouver, Ca., June 2001
A. Hottinen, "Iterative multiuser decoding in WCDMA systems," In Proc. Johns Hopkins Conferenece on Information Sciences and Systems, Baltimore, MD, March 1999.
T. Heikkinen and A. Hottinen, "Space-time power allocation in CDMA networks," Proc. 32nd Annual Conference on Information Sciences and Systems (CISS'98), Princeton, NJ, USA, March 1998
C. Sengupta, A. Hottinen, J. Cavallaro and B. Aazhang, "Maximum likelihood multipath channel parameter estimation in CDMA systems," 32nd Annual Conference on Information Sciences and Systems (CISS'98), Princeton University, NJ, USA, March 1998
A. Hottinen, " Blind iterative separation of CDMA signals by nonlinear independent component analysis," Proc. European Signal Processing Conference (EUSIPCO),Greece, September 1998
M.O. Sunay, Zhi-Chun Honkasalo; A. Hottinen, H. Honkasalo, Lin Ma, "A dynamic channel allocation based TDD DS CDMA residential indoor system," IEEE ICUPC, Oct. 12-16, 1997 Page(s):228 - 234 vol.1 [this old paper has been sampled as it describes something that could today be called an "overlay-underlay cognitive radio"]
T. Heikkinen and A. Hottinen, "Capacity of a wireless network," 31st Annual Conference on Information Sciences and Systems (CISS'97), Baltimore, USA, March 1997
J. Joutsensalo, J. Lilleberg, A. Hottinen, and J.Karhunen,"Subspace algorithms for synchronization and tracking in CDMA," Proc. IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications (SPAWC'97), Paris, France, April 1997, pp. 369-372
A. Hottinen and L. Holmström, "Projection pursuit for CDMA communications," Proc. 30th Annual Conference on Information Sciences and Systems (CISS'96), Princeton University, NJ, USA, March 1996
J. Joutsensalo, J. Lilleberg, A. Hottinen and J. Karhunen "Hierarchic method for CDMA synchronization," in Proc IEEE Norsig, Espoo, 1996
A. Hottinen, Linear space-time modulation in multiple-antenna channels, DSc dissertation, Helsinki University of Technology, 2004, For further information click here.
More publications, e.g. most of my IEEE publications, are listed here (requires IEEE Xplore access).
