Department of Electrical and Computer Engineering

Work Experience

• 1994 - present, Professor, Electrical & Computer Engineering Department, Southern Illinois University, Carbondale, Illinois.

• 1998 - 1999, (On leave from Southern Illinois University) Professor, Division of Engineering, University of Texas at San Antonio, San Antonio, TX.

• 1988 - 1994, Associate Professor, Electrical Engineering Department, Southern Illinois University, Carbondale, Illinois.

• Aug.1990 - Dec. 1990, Visiting Scientist (on Sabbatical), Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India.

• 1983 - 1988, Assistant Professor, Electrical Engineering Department, Southern Illinois University, Carbondale, Illinois.

• 1980 - 1983, Research Assistant, Electrical Engineering Department, Southern Methodist University, Dallas, Texas.

• 1977 - 1980, Deputy Engineer in the research and development division of Bharat Electronics Limited, Bangalore, India. Worked on the R&D projects involving adaptive delta modulation multiplexers, hand-held VHF transceivers, and burst transmission of digital messages.

Research Interest

• Wireless Communication and Networks

• Detection and Estimation Theory

• Spread Spectrum Communication

• Statistical Signal Processing

Teaching Experience

• Undergraduate: Signals and Systems, Analog and Digital Communications, Electric Circuits, Digital Signal Processing, Wireless Communications, Broadband Communication Systems, Control Systems.

• Graduate: Wireless Communications, Probability and Random Processes, Detection and Estimation Theory, Spread Spectrum Communication, Digital Communications.

Book

• Introduction to statistical signal processing with applications M.D. Srinath, P.K. Rajasekaran and R. Viswanathan, Prentice- Hall, 1996.

Professional Services

• Reviewer for, IEEE transactions on, Communications, Signal Processing, Aerospace and Electronics Systems, SMC, and Information Theory, IEE Communications, Electronic Letters, NSF, AFOSR, and various conferences: ACC, MILCOM, ICC, WCNC.

• Fellow of Institution of Electrical and Electronic Engineers (IEEE).

Thesis and Dissertation Supervision

• Supervised seven Ph.D. dissertations and thirty seven M.S. theses. Currently advising one Ph.D. student.

Current Ph.D. Students

• Anil Mehta

Book Chapter

1. P. K. Varshney and R. Viswanathan, "Communications and Radar- Detection In,"  Encyclopedia of Statistical Sciences II, Wiley, N.Y., Sep. 2006, pp. 1097 - 1109.

2. R. Viswanathan, "Order Statistics Applications to CFAR Radar Target Detection," in Handbook of Statistics, Vol. 17- Order Statistics and their Applications, N. Balakrishnan and C.R. Rao Eds., North-Holland Publishers, 1998, pp. 643-671.

3. S. Jayaweera and R. Viswanathan, Distributed Signal Processing in Wireless Sensor Networks, in Distributed Antenna Systems: Open Architecture for Future Wireless Communications, edited by H.Hu, Y. Zhang, and J. Luo, CRC Press, May 2007.

Also contributed an invited paper to IEEE Proceedings. Several of the published journal papers are included in two research monographs on distributed sensor fusion.

Selected Journal Publications

Communications

1. R. Viswanathan and S.C. Gupta, "Performance comparison of likelihood, hard-limited and linear combining receivers for FH-MFSK mobile radio-base to mobile transmission," IEEE Transactions on Communications, May 1983, pp. 670-677.

2. S.C. Gupta, R. Viswanathan, and R. Muammar, "Land mobile system- a tutorial exposition," IEEE Communications Magazine, June 1985, pp. 34-45.

3. R. Viswanathan and K. Taghizadeh, "Diversity combining in BFSK/FH system to combat partial band jamming," IEEE Transactions on Communications, September 1988, pp. 1062-1069.

4. A. Ansari and R. Viswanathan, "Application of Expectation-Maximization algorithm to the detection of direct sequence signal in pulsed noise jamming," IEEE Transactions on Communications, August 1993, pp. 1151-1154.

5. A. Ansari and R. Viswanathan, "Performance study of maximum-likelihood receivers and transversal filters for the detection of direct-sequence spread spectrum signal in narrow band interference," IEEE Transactions on Communications, Feb./Mar./April 1994, pp. 1939-1946.

6. Arif Ansari and R. Viswanathan, "On SNR as a measure of performance for narrowband interference rejection in direct sequence spread spectrum systems," IEEE transactions on Communications, Feb./Mar/April 1995, pp. 1318-1322.

7. C.H. Gowda, V. Annampedu, and R. Viswanathan, “Diversity Combining in Antenna Array Base Station Receiver for DS/CDMA System,” IEEE Communications Letters,July 1998, pp.180-182.

8. A. Mehta, D. Kagaris, and R. Viswanathan, "Thoughput Performance of an Adaptive ARQ scheme in Rayleigh Fading Channels," IEEE Transactions on Wireless Communications, Jan 2006, pp. 12 -15.

9. R. Viswanathan, “On the Autocorrelation of Complex Envelope of White Noise,” IEEE Transactions on Information Theory, pp. 4298-299, vol. 52, No. 9, Sept. 2006.

Signal Detection

1. S.C.A. Thomopoulos, R. Viswanathan, and D.C. Bougoulias, "Optimal decision fusion in multiple sensor systems," IEEE Transactions on Aerospace and Electronic Systems, September 1987, pp. 644-653.

2. R. Viswanathan, S.C.A. Thomopoulos, and R. Tumulury, "Optimal serial distributed decision fusion," IEEE Transactions on Aerospace and Electronic Systems, July 1988, pp. 366-375.

3. R. Viswanathan and V. Aalo, "On counting rules in distributed detection," IEEE Transactions on Acoustics, Speech, and Signal Processing, May 1989, pp. 772-775.

4. S.C.A. Thomopoulos, R. Viswanathan, and D.C. Bougoulias, "Optimal distributed decision fusion," IEEE Transactions on Aerospace and Electronic Systems,September 1989, pp. 761-765.

5. V. Aalo and R. Viswanathan, "Asymptotic performance of a distributed detection system in correlated Gaussian noise," IEEE Transactions on Signal Processing, January 1992, pp. 211-213.

6. R. Viswanathan and A. Eftekhari, "A selection and estimation test for multiple targets detection,"IEEE Transactions on Aerospace and Electronic Systems, April 1992, pp.505- 519.

7. V. Aalo and R. Viswanathan, " A multilevel quantization and fusion scheme for the decentralized detection of an unknown signal,"IEE proceedings, part F, Vol. 141, No.1, Feb. 1994, pp. 37-44.

8. C.H. Gowda and R. Viswanathan, “Posterior robustness of decentralized tests with contamination prior,” IEEE Transactions on Information Theory, July 1995, pp.1164-1169.

9. Hamid Amirmehrabi and R. Viswanathan, "A New Distributed Constant False Alarm Rate Detector," IEEE Transactions on Aerospace and Electronic Systems, Jan.1997,pp. 85-97.

10. R. Viswanathan and P.K. Varshney, “Distributed Detection With Multiple Sensors, Part I: Fundamentals,” invited paper, Proceedings of IEEE, Jan. 1997, pp. 54-63.

11. C.H. Gowda and R. Viswanathan, “Performance of Distributed CFAR Tests under various Clutter Amplitudes,” IEEE Transactions on AES, October 1999, pp. 1410-1419.

12. V. Annampedu, V. Roganov, and R. Viswanathan, “Two Rank Order Tests for M-ary Detection,” IEEE Transactions on Information Theory, March 2000, pp. 585-594.

13. V.K. Kanchumarthy, T. Choudhari, and R. Viswanathan, “Performance Analysis of Optimum Receivers for Differentially Encoded MPSK in Low SNR,” IEEE Communications Letters, May 2005.

14. V.R. Kanchumarthy, R. Viswanathan, and M. Madishetty, “Impact of Channel Errors on Decentralized Detection Performance of Wireless Sensor Networks: A Study of Binary Modulations, Rayleigh-Fading and Non-Fading Channels, and Fusion- Combiners,” IEEE Transactions on Signal Processing, May 2008, pp. 1761 - 1769.

Recent Conference Publications

1. N. Pastos and R. Viswanathan, “A Modified Grouped-Tag TDMA Access Protocol for Radio Frequency Identification Networks,” Proceedings Disk, WCNC, Chicago, Sep. 2000, paper L18.3.

2. B. Sreenivasan, K.V. Rao, and R. Viswanathan, “Assessment of MAP Channel Estimator for Adaptive Rate Coding in Rayleigh Fading Channel,” in Proceedings of the Workshop on Signal Processing, Communications, Chaos and Systems, Center for Engineering Science Advanced Research, Oak Ridge National Laboratory, TN, 2002, pp. 93-96, ISBN 0-9648312-6-0

3. A. Mengoulis, R. Viswanathan, and A. Mahajan, “Signal Parameter Estimation Based on one-bit Quantized Data from Multiple Sensors,” Proceedings of the fifth international conference on information fusion, Annapolis, MD, 2002, pp. 259-265.

4. S. Udar and R. Viswanathan, “Order Statistics Tests for M-ary Detection,” Abstract published in Fourth Biennial International Conference on Statistics, Probability and Related Areas, Division of Statistics, Northern Illinois University, Dekalb, IL, June 2002, pp. 78.

5. I. Youn, S. Mandala, and R. Viswanathan, “Comparison of Diversity Combining Techniques Based on K -out of- N Strongest Branch signals for FSK Detection in Fading Channels,” Allerton Conference on Communications, Control, and Computing, Urban-Champaign, IL, November 2003, pp. 1726 - 1727.

6. M. Madisetty, V.K. Kanchumarthy, C.H. Gowda, and R. Viswanathan, “Distributed Detection With Channel Errors,” 37th Southeastern Symposium on System Theory, Tuskegee University, AL, March 20-22, 2005, pp. 302-306.

7. A. Mehta, D. Kagaris, and R. Viswanathan, “Thoughput Performance of an Adaptive ARQ Scheme in Rayleigh Fading Channels,” Proceedings of the 39th Conference on Information Sciences and Systems, CISS'05, the Johns Hopkins University, Baltimore, March 16-18, 2005, pp. 102 - 107.

8. V.R. Kanchumarthy and R. Viswanathan, “Further impacts on the quality of wireless sensor links on decentralized detection performance,” Proceedings of CISS 06, Department of Electrical Engineering, Princeton University, Princeton, NJ, 2006, pp. 44-49.

9. H. Ray, N.Udar, and R. Viswanathan, “A weighted sum of Gaussian-derived pulse design for UWB,” 2006 IEEE Radio and Wireless Symposium, San Diego, Jan. 2006, pp. 383-386.

10. N. Udar, K.Kant. R. Viswanathan, and D. Cheung, “Characterization of Ultra Wideband Channel in Data Centers,” Networking 2007, Atlanta, GA, May 14-18, 2007, pp. 1187-1191.

11. N. Udar, K.Kant. R. Viswanathan, and D. Cheung, “Ultra Wideband Channel Characterization and Ranging in Data Centers,” presented at the International Conference on Ultra-wideband 2007, Singapore, Sept. 24-26, 2007.