Research & my interests


Good research enhances humanity ......

i have been fascinated by research. The fact good science and research has enhanced the quality of life immensly, has always motivated me to seek a career in research. During my bachelor days, i was motivated by the idea of statistical learning. This led to investigations into neural networks and handwriting recognition as a part of my final year project.

While at the University of Ulm, my interests were more in the area of communication theory. i worked on the application of genetic algorithms for multiuser detection. During the summer of 1998, i, by chance, came to know the area of blind signal processing and independent component analysis. This has led to my working towards applying principles of blind source separation towards communication problems esp., interference cancellation issues in CDMA.  My research interests can be broadly classified as follows

  • Algorithmic 
    • Blind source separation, independent component analysis, adaptive algorithms, statistical signal processing
    • Interference cancellation, sensor networks
  • Technological interests
    • Development of future mobile communication systems
    • Integration of devices, and services for future devices
    • Standardization of future mobile systems (4G)

                                        Curriculum Vitae
                            My CV in pdf format can be downloaded  here.
                                                        Abridged one page version: [ pdf ]
                                                        Longer version with publication list: [ pdf ]
Publications
       [ 2005 | 2004 | 2003 | 2002 | 2000 | 1999 ]

2005
  1. K. Raju,  T. Huovinen,  and T. Ristaniemi,  Blind Interference Cancellation Schemes for DS-CDMA Systems, In Proc. IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting,  Washington , USA , July 3-8 2005.
  1. K. Raju, T. Ristaniemi, J. Karhunen, and E. Oja, Jammer Cancellation in DS-CDMA Array Systems using Independent Component Analysis, IEEE Transactions on Wireless Communications -- in press.
    2004
  1.  K. Raju and  B. Phani Sudheer, Blind Source Separation for Interference Cancellation - A Comparison of Several Spatial and Temporal Statistics Based Techniques, In Proc. 3rd Workshop on the Internet, Telecommunications and Signal Processing, Adelaide, Australia, Dec 20-22, 2004. 
  1. K. Raju and J. Sarela, A Denoising Source Separation based approach to Interference Cancellation for DS-CDMA Array Systems, In Proc.  38th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, USA, Nov 07-10, 2004, pp. 1111--1114. 
  1. K. Raju, T. Ristaniemi, and J. Karhunen, Semi-Blind Interference Suppression on Coherent Multipath Environments,  In Proc.  First IEEE Int. Symposium of Control, Communications and Signal Processing (ISCCSP 2004), Hammamet, Tunisia, March 21-24, 2004, pp. 283--286.
2003
  1. K. Raju, and T. Ristaniemi, Exploiting Independence to Cancel interference due to Adjacent Cells in a DS-CDMA System, In Proc. 14th IEEE Int. Symposium of Personal Indoor Mobile Radio Communications (PIMRC 2003), Beijing, China, Sept 7-10, 2003, pp. 2130 -- 2134.
  1. T. Ristaniemi, K. Raju, J. Karhunen, and  E. Oja, ICA-Assisted Inter-Cell Interference Cancellation in CDMA Array Systems, In Proc. Fourth International Symposium on Independent Component Analysis and Blind
    Signal Separation (ICA 2003), Nara, Japan, April 1-4, 2003,  pp. 739--744.

2002
  1. T. Ristaniemi, K. Raju, J.  Karhunen, and E. Oja, Jammer Cancellation in DS-CDMA Array Systems: Pre and Post Switching of ICA and RAKE, In Proc. 2002 IEEE Int. Symposium on  Neural Networks for Signal Processing
    (NNSP 2002), Martingy, Switzerland, September 4-6, 2002, pp. 495--504.
  1. K. Raju, and T. Ristaniemi, ICA-RAKE-Switch for Jammer Cancellation in DS-CDMA Array Systems, In Proc. 2002 IEEE Int. Symp. on Spread Spectrum Techniques and Applications (ISSSTA 2002), Prague, Czech Republic, September 2-5, 2002, pp. 638--642.
  1. K. Raju, T. Ristaniemi, J. Karhunen, and E. Oja, Suppression of Bit-Pulsed Jamming Using Independent Component Analysis, In Proc.  2002 IEEE Int. Symp. on Circuits and Systems (ISCAS 2002), Phoenix, Arizona, USA, May 26-29, 2002, pp. I-189/I192.
  1.  T. Ristaniemi, K. Raju, and J. Karhunen, Jammer Mitigation in DS-CDMA Array System Using Independent Component Analysis, In Proc. IEEE Int. Conference on Communications (ICC 2002), New York City, NY, USA,
    April 28 - May 2, 2002, pp. 232--236.
  1. A. Hyvarinen, and K. Raju, Imposing Sparsity on the mixing matrix in independent component analysis, Neurocomputing, 49:151--162, 2002
    (Special Issue on ICA and BSS).
2000
  1. A. Hyvarinen, and K. Raju, Sparsifying Priors for use in the mixing matrix of ICA of images, 2nd International Workshop on Independent Component Analysis and Blind Source Separation, Helsinki, 2000, 472 -- 477. 
  1. K. Raju, Feasibility Study of Adhoc Protocols for Vehicular Environments, Internal Document, DaimlerChrysler Research Centre, Ulm, Germany.
1999
  1. K. Raju, W. G. Tiech, and J. Lindner, Genetic Algorithms - A Promising approach for hard optimization problems, 3rd Workshop on Communication Techniques, Schloss Reissenberg, July 7- 9, 1999.
 

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