San Diego State University

Publications

Journal Papers

  1. S. Nagaraj and M. Sarkar, “Inter-Carrier Interference Reduction Technique for Backscattered OFDM,” IEEE Transactions on Vehicular Technology, pp. 12237-12241, Vol. 73, No. 8, August 2024.
  2. S. Nagaraj and C. Prasad, “Sine-Cosine Modulation for SSB backscatter applications,” IEEE Journal of Radio Frequency Identification, pp. 197-201, Vol. 6, No. 1, March 2022.
  3. S. Nagaraj and R. Yaqo, “A Frequency Modulation technique for SNR improvement in backscatter radios,” IEEE Communications Letters, pp. 3956-3959, Vol. 25, No. 12, December 2021.
  4. S. Nagaraj, “Angle domain massive MIMO-OFDMA using a scalar channel estimate,” Wireless Personal Communications (Springer), DoI: 10.1007/ss11277-021-08226-4, February 2021.
  5. S. Nagaraj, “Spectrum shaping to avoid OFDM interference to in-band radars in the U-NII bands,” IEEE Communications Letters, pp. 2819–2823, Vol. 24, No. 12, December 2020.
  6. P. Patel, M. Sarkar and S. Nagaraj, “Wireless channel model of ultra wideband radio signals for implantable medical devices,” Health and Technology (Springer), pp. 97– 110, Vol. 8, Issue 1-2, May 2018.
  7. M. Bhupatiraju and S. Nagaraj, “An advanced 3-mode base station switching tech- nique for energy efficient cellular networks,” International Journal of Signal Processing and Analysis, Vol. 3, Issue 1, 3:004, January 2018.
  8. S. Biswash, S. Nagaraj, M. Sarkar and N. Narra, “Bee-system based base station co- operation technique for mobile cellular networks,” Wireless Personal Communications (Springer), pp. 1193–1220, Vol. 92, Issue 8, August 2017.
  9. S. Nagaraj, “Spectrum shaping for backscatter modulation,” Information & Communications Technology Express (Elsevier), pp. 52–55, Vol. 3, Issue 1, March 2017.
  10. S. Nagaraj and F. Rassam, “Improved noncoherent UWB receiver for implantable biomedical devices, IEEE Transactions on Biomedical Engineering, pp. 2220–2225, Vol. 63, No. 10, October 2016.
  11. S. Basu, M. Sarkar and S. Nagaraj, “A survey on ultra-wideband and ultrasonic communication for body area networks,” Int. J. on Ultra Wideband Communications and Systems, pp. 143–154, Vol. 3, No. 3, 2016.
  12. K. Son, R. Guruprasad, S. Nagaraj, M. Sarkar and S. Dey, “Dynamic cell reconfiguration framework for energy conservation in cellular wireless networks, Journal of Communications and Networks, pp. 567–579, Vol. 18, Issue 4, August 2016.
  13. S. Nagaraj, “Performance analysis of coded SSK modulation on block-fading channels,” IEEE Transactions on Vehicular Technology, pp. 6773–6777, Vol. 65, No. 8, August 2016.
  14. S. Biswash, S. Nagaraj and M. Sarkar, “A device centric communication system for 5G networks,” International Journal of Handheld Computing Research, pp. 61–73, Vol. 5, No. 3, July 2015.
  15. J. Manry and S. Nagaraj, “Non-iterative bit-loading algorithm for OFDM in independent and correlated fading,” Journal of Information Processing Systems, pp. 163–175, Vol. 10, No. 2, June 2014.
  16. S. Nagaraj and A. Alimohammad, “Soft-decision decoding of convolutional codes with square-law detectors,” IET Communications, pp. 966–972, Vol. 7, No. 10, July 2013.
  17. S. Nagaraj and M. Bell, “Multiscale unit-memory convolutional codes,” IET Communications, pp. 1043–1050, Vol. 7, No. 11, July 2013.
  18. P. Chaurasiya, A. Ashrafi and S. Nagaraj, “Novel spectrally-efficient UWB pulses using zinc and frequency-domain Walsh basis functions,” ETRI Journal, pp. 397– 405, Vol. 35, No. 3, June 2013.
  19. W. -H. Chung, S. Kumar, S. Paluri, S. Nagaraj, A. Annamalai and J. D. Matyjas, “A cross-layer unequal error protection scheme for prioritized H.264 video using RCPC codes and hierarchical QAM,” Journal of Information Processing Systems, pp. 53–68, Vol. 9, No. 1, March 2013.
  20. A. Alimohammad, S. Nagaraj, S. F. Fard and B. F. Cockburn, “Layered space- time multiple-input multiple-output detector with parameterizable performance,” IET Communications, pp. 3053–3058, Vol. 6, No. 17, November 2012.
  21. S. Nagaraj and J. Xiao, “Best antenna selection for coded OFDM,” Signal Processing, pp. 391–394, Vol. 90, Issue 1, January 2010.
  22. S. Nagaraj, “Pre-DFT combining for coded OFDM,” IEEE Transactions on Vehicular Technology, pp. 5305–5309, Vol. 58, Issue 9, November 2009.
  23. S. Nagaraj, “Symbol level adaptive modulation for coded OFDM,” IEEE Transactions on Communications, pp. 2872–2875, Vol. 57, Issue 10, October 2009.
  24. S. Nagaraj, “Adaptive modulation for limited diversity fading channels,” IET Communications, pp. 1675–1682, Vol. 3, Issue 10, October 2009.
  25.   S. Nagaraj, “Improving power efficiency of coded OFDM using feedback,” IEEE Transactions on Communications, pp. 2541–2544, Vol. 57, Issue 9, September 2009.
  26. S. Nagaraj and M. Bell, “Trellis coded modulation based distributed channel coding,” IET Communications, pp. 1071–1080, Vol. 3, Issue 7, July 2009.
  27. S. Nagaraj, “An extension to the Ordered Subcarrier Selection Algorithm for OFDM,” IEEE Transactions on Wireless Communications, pp. 1159–1163, Vol. 8, Issue 3, March 2009.
  28. S. Nagaraj, “Entropy based spectrum sensing in cognitive radio,” Signal Processing, pp. 174–180, Vol. 89, Issue 2, February 2009.
  29. S. Nagaraj, “Generalized BICM for block fading channels,” IEEE Transactions on Wireless Communications, pp. 4404–4410, Vol. 7, Issue 11, November 2008.
  30. S. Nagaraj, “Power allocation for concatenated trellis coded modulation,” IEEE Trans- actions on Wireless Communications, pp. 3230-3237, Vol. 7, No. 8, August 2008.
  31. S. Nagaraj and M. Bell, “Coding techniques for diversity and link adaptation in multicarrier systems,” IET Communications, pp. 895–902, Vol. 2, No. 7, August 2008.
  32. S. Nagaraj and M. Bell, “Concatenated trellis coded modulation for quasi-static fading channels,” IEEE Transactions on Wireless Communications, pp. 1320–1328, Vol. 6, No. 9, Sept 2007.

Conference Papers

  1. S. Nagaraj and M. Sarkar, “Preliminary results on overlaid cooperation channels between nearby 802.11 access points,” in Proc. of the 2022 IEEE International Black Sea Conference on Communications and Networking, June 2022.
  2. S. Gadhiraju, M. Sarkar and S. Nagaraj, “Throughput and delay considerations of UAV assisted vehicular wireless networks,” in Proc. of the 2022 IEEE International Black Sea Conference on Communications and Networking, June 2022.
  3. S. Nagaraj and F. Harris, “Vestigial Sideband Modulation for adjacent channel coexistence of wireless networks with radio astronomy,” in Proc. of the 55th Asilomar Conference on Signals, Systems and Computers, published March 2022.
  4. S. Nagaraj, N. Namala and M. Sarkar, “Quasi-coherent demodulation of ambient FM signal backscatter,” in Proc. of the 2019 IEEE Global Communications Conference (GlobeCom), Waikoloa, HI, December 2019.
  5. A. Mihovska, H. Harikrishnan, M. Sarkar and S. Nagaraj, “An experimental study of a novel MAC protocol using UHF-RFID passive backscatter modulation for brain- computer interface (BCI) applications,” in Proc. of the 2019 IEEE Black Sea Conference on Communication Systems and Networking (BlackSeaCom), Sochi, Russia, June 2019.
  6. S. Nagaraj and M. Sarkar, “Orthogonal channelization of backscattering tags using Golay complementary sequences,” in Proc. of the 2018 IEEE International Confer- ence on Advanced Networks and Telecommunications Systems (ANTS), Indore, India, December 2018.
  7. G. Kulkarni, M. Sarkar and S. Nagaraj, “Design of 4G LTE testbed for implementing green cellular algorithms,” in Proc. of the 2017 International Wireless Communica- tions and Mobile Computing Conference, Valencia, Spain, June 2017.
  8. P. Patel, M. Sarkar and S. Nagaraj, “Tracking the behavior of UWB transmissions in invasive BCI applications,” in Proc. of the 2016 Body Sensor Network Conference, San Francisco, CA, June 2016.
  9. R. Patel, P. Patel, M. Sarkar and S. Nagaraj, “Investigating the feasibility of multiple UWB transmitters in BCI applications,” in Proc. of the 2016 Body Sensor Network Conference, San Francisco, CA, June 2016.
  10. P. Patel, K. Kushalad, M. Sarkar and S. Nagaraj, “Channel modeling based on statistical analysis for brain-computer interface (BCI) applications,” in Proc. of the 2016 IEEE Conference on Computer Communications Workshops, San Francisco, CA, April 2016.
  11. P. Patel, S. Nagaraj and M. Sarkar, “Ultrawideband channel characterization for invasive biomedical applications,” in Proc. of the 2016 IEEE Wireless and Microwave Technology Conference, Clearwater Beach, FL, April 2016.
  12. S. Biswash, M. Sarkar and S. Nagaraj, “A heterogeneous cellular communication system for moving users: a 5G perspective,” in Proc. of the 2015 Wireless Innovations Conference, San Diego, CA, March 2015.
  13. S. Biswash, S. Nagaraj and M. Sarkar, “Bee system-based energy efficient base sta- tion operation in mobile cellular networks,” in Proc. of the 2015 IEEE International Conference on Networking and Communications, Anaheim, CA, February 2015.
  14. K. Kanda and S. Nagaraj, “Outage analysis of multiple-antenna cognitive radios in TV white space,” in Proc. of the 2014 National Wireless Research and Collaboration Symposium, Idaho Falls, ID, May 2014.
  15. F. Rassam and S. Nagaraj, “Cognitive Radio in TV white space,” in Proc. of the 2014 National Wireless Research and Collaboration Symposium, Idaho Falls, ID, May 2014.
  16. P. Sehgal, S. Nagaraj and f. harris, “Performance analysis of MMSE equalization in staggered OFDM,” in Proc. of the 2014 National Wireless Research and Collaboration Symposium, Idaho Falls, ID, May 2014.
  17. S. Nagaraj and M. Sarkar, “A novel power allocation technique for 4G cellular networks,” in Proc. of the 2014 IEEE International Conference on Networking and Communications, Honolulu, HI, February 2014.
  18. F. Rassam, M. Sarkar, S. Nagaraj and K. Moon, “Ultra wideband transceiver design for compact and implantable medical devices,” in Proc. of the 2013 IAENG International Conference on Communications Systems and Technologies, San Francisco, CA, October 2013; received the Best Paper Award at the conference.
  19. V. Santhanam, M. Sarkar, S. Nagaraj and C. Paolini, “A novel spectrum assignment technique for interference mitigation in 4G heterogeneous networks,” in Proc. of the 2013 IAENG International Conference on Communications Systems and Technologies, San Francisco, CA, October 2013.
  20. C. Paolini, C. Aguirre, M. Sarkar and S. Nagaraj, “An ad-hoc broadcast scheme using the radio data system (RDS) in the FM band,” in Proc. of the 2013 IAENG International Conference on Internet and Multimedia Technologies, San Francisco, CA, October 2013.
  21. V. Ramanna, C. Paolini, M. Sarkar and S. Nagaraj, “Minimizing computing core costs in cloud infrastructures that host location-based advertising services,” in Proc. of the 2013 IAENG International Conference on Internet and Multimedia Technologies, San Francisco, CA, October 2013.
  22. S. Pillappaiah, M. Sarkar, S. Nagaraj and C. Paolini, “Auction based resource allocation in WiMAX,” in Proc. of the 2013 IEEE International Wireless Communications and Mobile Computing Conference, Cagliari, Italy, July 2013.
  23. R. Balasubramaniam, S. Nagaraj, M. Sarkar, P. Khaitan and C. Paolini, “Cell zooming for power efficient base station operation,” in Proc. of the 2013 IEEE International Wireless Communications and Mobile Computing Conference, Cagliari, Italy, July 2013.
  24. K. Son, S. Nagaraj, M. Sarkar and S. Dey, “QoS-Aware Dynamic Cell Reconfiguration for Energy Conservation in Cellular Networks,” in Proc. of the 2013 IEEE Wireless Communications and Networking Conference, Shanghai, China, April 2013.
  25. C. Paolini, M. Sarkar and S. Nagaraj, “Modeling Throughput and Delay in 802.11 Infrastructure Mode Networks with QoS Support from the Point Coordination Function,” in Proc. of the 2012 World Congress on Engineering and Computer Science, San Francisco, CA, December 2012.
  26. D. Rawat, S. Kumar and S. Nagaraj, “Adaptive modulation approach for robust MPEG-4 AAC encoded audio transmission,” in Proc. of the 2011 IEEE Military Communications Conference, Baltimore, MD, November 2011.
  27. M. M. Sarkar, I. Balsania and S. Nagaraj, “A SINR based MAC layer protocol for multi- channel ad-hoc networks,” in Proc. of the 2011 International Wireless Communication and Mobile Computing Conference, Istanbul, Turkey, July 2011.
  28. M. Hosany, S. Kumar and S. Nagaraj, “An unequal error protection scheme employing convolutional codes and asymmetric 8PSK modulation for robust transmission of H.264/AVC video in wireless channels,” in Proc. of the 2010 IEEE International Conference on Signal Processing and Communication Systems, Gold Coast, Australia, December 2010.
  29. S. Budhwani, M. Sarkar and S. Nagaraj, “A MAC protocol for sensor networks using directional antennas,” in Proc. of the 2010 IEEE International Conference on Sensor Networks, Ubiquitous and Trustworthy Computing, Newport Beach, CA, June 2010.
  30. W. Chung, S. Paluri, S. Kumar and S. Nagaraj, “Unequal error protection for H.264 video using RCPC codes and hierarchical QAM,” in Proc. of the 2010 IEEE Interna- tional Communications Conference, Cape Town, South Africa, May 2010.
  31. S. Nagaraj and M. Sarkar, “Adaptive modulation for limited diversity fading channels,” in Proc. of the 2009 IEEE Vehicular Technology Conference, Anchorage, AK, September 2009. 
  32. J. Kassab and S. Nagaraj, “Adaptive modulation in an OFDM communications system with artificial neural networks,” in Proc. of the 2009 IEEE International Joint Conference on Neural Networks, Atlanta, GA, June 2009.
  33. 1. X. Chen and S. Nagaraj, “Entropy based spectrum sensing in cognitive radio,” in Proc. of the 2008 IEEE Wireless Telecommunications Symposium, Pomona, CA, April 2008.
  34. D. Ravi and S. Nagaraj, “Performance of a novel power loading algorithm on uncoded and convolutionally coded OFDM,” in Proc. of the 2007 IEEE Wireless Telecommunications Symposium, Pomona, CA, March 2007.
  35. K. Kala and S. Nagaraj, “Rate identification in multirate CDMA,” in Proc. of the 2007 IEEE Wireless Telecommunications Symposium, Pomona, CA, March 2007.
  36. S. Nagaraj and M. Bell, “Performance analysis of coded modulation cooperation protocols,” in Proc. of the 2006 IEEE Global Communications Conference, San Francisco, CA, November 2006.
  37. S. Nagaraj and M. Bell, “Multiple sequence multicarrier CDMA for interference free multiple access”, in Proc. of the 2006 IEEE Wireless Telecommunications Symposium, Pomona, CA, April 2006.
  38. K. Sayana, S. Nagaraj and S. Gelfand, “A zero-forcing log-likelihood receiver for MIMO BICM with successive cancellation,” in Proc. of the 2005 Signal Processing Advances in Wireless Communication Systems, New York, NY, June 2005.
  39. S. Nagaraj and M. Bell, “A coded modulation technique for user cooperation diversity in wireless networks”, in Proc. of the 2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, Philadelphia, PA, March 2005.
  40. S. Nagaraj and M. Bell, “Coding techniques for limited diversity fading channels,” in Proc. of the 2005 Conference on Information Sciences and Systems, Baltimore, MD, March 2005.
  41. S. Nagaraj and M. Bell, “Systematic codes for M-algorithm decoding,” in Proc. of the 2005 Conference on Information Sciences and Systems, Baltimore, MD, March 2005
  42. S. Nagaraj and M. Bell, “Multiuser codes for the relay channel,” in Proc. of the 2005 Conference on Information Sciences and Systems, Baltimore, MD, March 2005.
  43. B. B. Hombs, M. Rimbert and S. Nagaraj, “Doppler diversity and turbo-coded CDMA,” in Proc. of the 2004 IEEE Vehicular Technology Conference, Los Angeles, CA, September 2004.