Research Contributions

Research Areas

  • Communications Systems and Wireless,
  • Digital Signal Processing,
  • Detection and Tracking Systems and Estimation theory,
  • VLSI design for communication systems and signal processing,
  • Modeling and Simulation.

Technology Developments and Transfers
in National and Other Endeavors (Select)

Carried out system and sub-system designs and provided guidance to teams of scientists / engineers from DRDO and industries for technology development through numerous consultancy and sponsored projects. The following is a select list of technologies successfully developed, transferred and adopted : 

  1. Sonar Homing Systems for Light Torpedos: Provided the design and guided a team of Scientists of DRDO on invitation to successfully develop a Sonar Homing System. The homing system is the brain and lifeline of the torpedo. The designs were used in the Advanced Light Torpedo (TAL) and Shyena developed and marketed by DRDO and adopted by defense forces (see the links below to these products from DRDO.
    https://en.wikipedia.org/wiki/Advanced_Light_Torpedo_Shyenahttps://drdo.gov.in/torpedo-advanced-light-tal
    https://bdl-india.in/torpedo-advanced-lightweight
  2. Passive Sonar: Designed the Detection and Ranging Algorithms for Passive Sonar for DRDO on invitation. The passive surveillance and ranging system is the most important subsystem of the product. The algorithms were used in Panchendriya Sonar developed and marketed by DRDO and adopted by defense forces (see the links below to the system from DRDO):
    https://en.wikipedia.org/wiki/Panchendriya_(sonar)https://www.drdo.gov.in/panchendriya
  3. Electromagnetic Proximity Fuse (EMPF): A design for an Electromagnetic Proximity Fuse (EMPF) was given and a prototype was developed for DRDO on invitation. The proximity fuse is now an important subsystem of the Wire guided torpedoes like the Varunastra developed and marketed by DRDO (see the links below to the torpedo developed by DRDO):
    https://www.drdo.gov.in/varunastrahttps://tdf.drdo.gov.in/project/design-development-programmable-proximity-sensor-along-proximity-fuze-programmer-pfp-unit
  4. Communication Links for Missiles: Part of a three-member team that provided the design of a CDMA Data Link for the mid-course guidance of missiles on invitation from DRDO. This communication system with enhancements is being used currently in the Prithvi missile which is adopted by defence forces.
  5. Ultra-low-bit-rate Voce codec:EngDeveloped 2.4kbps Ultra low-bit-rate speech codecs as per FS-1015 standard and a CELP/ MELP codec that works at 4.8kbps and transferred to DEAL Dehradun, DRDO on invitation. DRDO informed us that these codecs have been used in several defence products which were adopted by defence forces (see the link given below in this context from DRDO):
    https://www.drdo.gov.in/technology-cluster-links/labs-products-detail/1786/187https://www.drdo.gov.in/labs-establishment/technologies/centre-artificial-intelligence-robotics-cair
  6. Algorithms for Rocket launchers and Torpedo launchers: developed by DRDO: We did exploration of the estimation algorithms for the purpose of implementing in rocket and torpedo launchers and their performance evaluation was studied for DRDO on invitation. DRDO used these in several of their products which were adopted by or defence (see the links below to these products from DRD.
    https://www.drdo.gov.in/labs-and-establishments/naval-science-technological-laboratory-nstl
  7. Target Simulator and Diagnostic System for Indra-1 radar: As long back as in 1981 during the 2-month internship as an MTech student of IIT Kharagpur at LRDE (DRDO), a hardware subsystem comprising of a target simulator-cum- diagnostic system was designed, a prototype (comprising of 102 Digital and analog IC’s) successfully developed and tested. Later, it was learnt that the sub- system went as it was into the Indra-1 radar, the first ever to be developed by DRDO successfully. The internship report that was submitted too went as it was into the system reference manual of the radar.
  8. Other Technologies:Apart from the above, we helped DRDO in other projects like SDR development on invitation.
  9. Development of SIP and H.323 Protocols:We provided guidance to teams of industries like M/s Hellosoft who were deployed here in IIT Khargapur to develop the protocol suits of SIP and h.323 on invitation. These were developed, market and transferred successfully by these industries.
  10. Development of subsystems for 3rd generation Cellular:We developed algorithms for several subsystem implementation as per the 3GPP 3 rd generation cellular standards, tested and transferred the same to National Semiconductor Corpn, USA.
  11. Development of subsystems for WiFi:We developed algorithms for several subsystem implementation as per the IEEE 802.11b and IEEE 802.11g WiFi standards, tested and transferred the same to National Semiconductor Corpn, USA

Select Research Publications

Published over 160 papers in Journals and Conferences. A select compilation is as follows.

  1. Satya Ganesh Dontamsetti and R.V. Raja Kumar, "A MIMO Moving Target Detection Radar with Optimal Transmit and Receive Weightage," Signal Processing(Elsevier), vol. 208(1), Feb 2023
  2. Satya Ganesh Dontamsetti and R V Raja Kumar, “ A Distributed MIMO Radar With Joint Optimal Transmit and Receive Signal Combining,” IEEE Trans. Aerosp. Electron. Syst. Vol. 57(1), pp. 623-635, 2021.
  3. Ganesh, D.S., Raja Kumar, R.V., "A Novel Transmit Weight Scheme for MIMO Radar Multiple Target Detection ", Proceedings of 2022 IEEE 19th India Council International Conference (INDICON), Kochi, 24-26 Nov 2022.
  4. Subbarao Boddu, A Mukhopadhyay, B V Philip, S S Das, R V Raja Kumar, "Bandwidth partitioning and SINR threshold analysis of fractional frequency reuse in OFDNA cellular networks for real time and best effort traffic", Springer Int J. on Wireless Personal Commun., vol.75, no.1, pp.325-347, March 2014.
  5. Subbarao Boddu, S S Das, R V Raja Kumar, "Performance analysis of flexible reuse in cellular networks". IET Communications, Nov 2014, DOI:1.1049/let-com.2014.0738.2015.
  6. Praful Mankar, G Das, SS Pathak and R V Rajakumar, "A Method for Accessing Spatial Spectrum Holes for Relay Based Cognitive Cellular Networks", IEEE Wireless Communications Letters, 2015.
  7. Jinesh P Nair and Ratnam V Raja Kumar, Channel Estimation in OFDM Systems Using a Controlled Superimposition of Training Sequences, Circuits, Systems, and Signal Processing, Birkhäuser Boston, vol.29, No.2, pp. 349-360, April, 2010.
  8. JP Nair, RVR Kumar, “Data Aided Iterative Channel Estimation in OFDM Systems Using a Controlled Superimposition of Training Sequences”, Wireless Personal Communications, Springer, , Vol. 68, No.4, pp 1241-1254, Feb 2013.
  9. JP Nair, RV Raja Kumar, "Improved superimposed training-based channel estimation method for closed-loop multiple input multiple output orthogonal frequency division multiplexing systems", Communications, IET, Vol.5, No.2, pp.209-221, Jan. 2011.
  10. Abhinav Kumar Tyagi, R. V. Rajakumar, A Wideband RF Frontend Architecture for Software Defined Radio, Circuits, Systems, and Signal Processing, Vol 30, No.4, pp 689-704, August 2011.
  11. Jinesh P Nair, Ratnam V Raja Kumar, Optimal superimposed training sequences for channel estimation in MIMO-OFDM systems, EURASIP Journal on Advances in Signal Processing, vol.2010, pp.1-20, Feb. 2010.
  12. S. M. Sameer and R. V. Raja Kumar, “An efficient technique for the integer frequency offset estimation in OFDM systems , Signal Processing, vol.89, pp.252–256 (2009).
  13. S. M. Sameer, Ratnam V. Raja Kumar: An Efficient Maximum Likelihood Carrier Frequency Offset Estimator for OFDM Using Null Subcarriers and Cyclic Prefix. Wireless Personal Communications, vol.58, No.2, pp.259-279, (2011).
  14. Debarati Sen, Rahul Dasgupta, Saswat Chakrabarti, R. V. Raja Kumar, A Novel Frequency Synchronization Algorithm and its Cramer Rao Bound in Practical UWB Environment for MB-OFDM Systems, Radio Engineering, Vol. 17, No. 3, Sept. 2008
  15. Amit Kumar, Munish Bansal, R.V. RajaKumar,"An approach for designing a UMTS and CDMA2000 Dual Standard Compatible Baseband ASIC" Journal of Information and Telecommunication Facility Engineering, S. Korea, Vol.3, No.1, pp.88-101 March, 2004.
  16. Satya Prasad R, Saswat Chakrabarti, S. S. Pathak, R. V. Raja Kumar, A High Speed Underwater Acoustic Modem for Video Communication, Journal of Systems and Technologies, Vol.2, No.2, pp 195-206, 2009.
  17. Sen, D., Chakrabarti, S., Raja Kumar, R. V., "Frequency Offset Estimation by Multi-Band Averaging Method: A New Approach for MB-OFDM based Ultra-Wideband Communication System," Springer: Wireless Personal Communications, vol.54, No.4, pp.623-633 (2010)
  18. Sen, D., Chakrabarti, S., Raja Kumar, R. V., "An Adaptive Timing Synchronization Scheme for Multi-Band Orthogonal Frequency Division Multiplexing based Ultra-Wideband Communication Systems," Springer: Wireless Personal Communications, vol. 53, No.2, pp.281-298 (2010).
  19. Debarati Sen, Saswat Chakrabarti, Ratnam V. Raja Kumar: Some interesting results on compatible BER analysis issues related to multi-band timing and frequency synchronizers applicable for MB-OFDM based UWB communications. Digital Signal Processing 21(2): 332-340 (2011).
  20. Poonam Singh, R.V. Raja Kumar and T. S. Lamba, “A Novel Multiple Access Scheme for Mobile Communication Systems,” ‘Indian Journal of Radio and Space Physics (IJRSP), Vol. 36, Oct., 2007, pp. 430-435.
  21. Praful Mankar, S.S. Pathak, R.V. Rajakumar, A Cooperative Secondary User localization Based Primary User Localization Method for Cognitive Radio Networks, NCC 2012, IIT Kharagpur, India, 3-5 Feb 2012.
  22. Mankar, P.; Pathak, S.S.; Rajakumar, R.V., "Likelihood Criteria Based Co-channel Primary Transmitters Localization Algorithm for Cognitive Radio Networks," IEEE Tencon 2013 Spring.
  23. Purnendu Karmakar, Prof. R. V.Rajakumar, Dr. Rajarshi Roy, Energy Efficient Cell Planning Using Centroidal Voronoi diagram, Fourth Nordic Workshop on System and Network Optimization for Wireless, April 5, 2013.
  24. Gupta, P.K.; Rajakumar, R.V.; Kumar, C.S., "Energy cost analysis of data plane and control plane protocols for 3GPP-LTE," Communications (NCC), 2012 National Conference on , vol., no., pp.1,5, 3-5 Feb. 2012 doi: 10.1109/NCC.2012.6176813
  25. Gupta, P.K.; Rajakumar, R.V.; Kumar, C.S., "Energy impact of signalling protocols in 3GPP-LTE and guidelines for savings," India Conference (INDICON), 2012 Annual IEEE , vol., no., pp.126,130, 7-9 Dec. 2012.
  26. Gupta, P.K.; Rajakumar, R.V.; Kumar, C.S., "Analysis of impact of network activity on energy efficiency of 3GPP-LTE," India Conference (INDICON), 2012 Annual IEEE , vol., no., pp.665,669, 7-9 Dec. 2012.
  27. Gupta, P.K.; Parul Saraswat; Kumar, C.S; Saswat Chakrabarti; Rajakumar, R.V.;,” Measurement of Power Consumption in MultiMedia Mobiles for Various Network Activities in 2G/3G Networks” IEEE ANTS, 2012.
  28. Gupta, P.K; R.V Rajakumar; C.S.Kumar; G Das; “Analytical Evaluation of Signalling Cost in Power Saving Mechanism in Mobile Networks” in IEEE TENCON-SPRING, 2013
  29. Hari Krishna Boyapati, Raja Kumar, R V; Saswat Chakrabarti , "Quantifying the Improvement in Energy Savings for LTE eNodeB Baseband Subsystem with Technology Scaling and Multi-Core Architectures", National Conference on Comunications, NCC 2012, IIT Kharagpur, 3-5 Feb 2012.
  30. Gan Chaudhuri, S.Kumar, C.S.; RajaKumar, R.V., Validation of a DiffServ based QoS model implementation for real-time traffic in a test bed 2012 National Conference on Communications (NCC), 3-5 Feb. 2012, Page(s): 1 – 5.
  31. R. V. Raja Kumar, Jagadeesh Gurugubelli, How green the LTE technology can be?, 2nd International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace & Electronic Systems Technology (Wireless VITAE), 2011, Feb. 28 2011-March 3 2011, Page(s): 1 – 5.
  32. B Hari Krishna, R V Raja Kumar and S Chakrabarti, Characterization of Baseband Implementations Using Energy Efficiency Metric Based Quantification, 2011 Int Conf on Devices and Communications (ICDeCom), 24-25 Feb. 2011.
  33. Hari Krishna Boyapati; Raja Kumar, R V, A comparison of DSP, ASIC, and RISC DSP based implementations of multiple access in LTE, : 2010 International Symposium on Communications, Control and Signal Processing (ISCCSP), 2010.
  34. R.V.Raja Kumar, Hari Krishna B, "Optimum Multi-core Architectures for Baseband Processing in an LTE e-Node B" 3rd International ICST Conference on Security and Privacy in Mobile Information and Communication Systems (MOBISEC), will be in- dexed in Springer Journal: Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering (LNICST), Aalborg, Denmark, 17-19 May 2011.
  35. Hari Krishna Boyapati; Raja Kumar, R V; Saswat Chakrabarti, "Energy Consumption Assessment in LTE baseband of eNodeB and Guidelines for green baseband subsys- tems," IEEE conference on Green Energy, Communication and Computing, INDICON 2010, Kolkata, 18-19 Dec 2010.
  36. Pankaj Kumar Gupta, R.V.Rajakumar, C.S. Kumar, Title : Energy Cost Analysis of User Plane and Control Plane Protocols for 3GPP-LTE, Journal Name : NCC 2012, IIT Kharagpur, India, 3-5 Feb 2012.
  37. Debarati Sen, Saswat Chakrabarti, Ratnam V. Raja Kumar: Energy Efficient Timing Synchronizer for MB-OFDM UWB. VTC Spring, 15-18 May 2011:1-6.
  38. Debarati Sen, Saswat Chakrabarti, Ratnam V. Raja Kumar: Combined BER Analysis for Time-Frequency Synchronization Schemes for MB-OFDM UWB. VTC Spring, 15-18 May 2011:1-6.
  39. Venkatesh Ramakrishnan, S. Mishra, Gerd Ascheid, Ratnam V. Raja Kumar: A High Level Performance Estimation: Modeling the Effects of Parameters on Performance Properties for a Tool Assisted SDR Development. ICC 2010: 1-5.
  40. A Tyagi, R. V. Raja Kumar, A wideband RF frontend architecture for software defined radio, 2010 International Conference onIndustrial and Information Systems (ICIIS), 2010 , July 29-Aug.1, 2010, pp.25-30.
  41. Jinesh P. Nair and R.V. Raja Kumar, “Channel estimation and equalization in OFDM systems using a controlled superimposition of training sequences,” Proc. Tenth International Symposium on Wireless Personal Multimedia Communications, pp. 79-81, Jaipur-India, December 2007.
  42. Jinesh P. Nair and R. V. Raja Kumar, A Bandwidth Efficient Channel Estimation Method Using Superimposed Training for MIMO-OFDM Systems” accepted in IEEE Region 10 Conference, (TENCON 2008), IEEE Region 10 Conference, (TENCON 2008), Hyderabad, , IEEE (2008)
  43. Jinesh P. Nair and R. V. Raja Kumar, “An Iterative Channel Estimation Method using Superimposed Training for IEEE 802.16e based OFDM systems, ”Proc. 12th Annual IEEE International Symposium on Consumer Electronics, pp. 1-4,Algarve-Portugal, April 2008.
  44. Jinesh P. Nair and R. V. Raja Kumar, “An Iterative Channel Estimation Method using Superimposed Training in OFDM systems” accepted in the 68th IEEE Vehicular Technology Conference (VTC Fall 2008), Calgary-Canada, September 2008.
  45. Jinesh P. Nair and R. V. Raja Kumar, “An Optimal Superimposed Training Sequence for Channel Estimation in OFDM Systems” accepted in the 19th IEEE Symposium on Personal Indoor Mobile Radio Communications (PIMRC 2008), Cannes-France, September 2008.
  46. Jinesh P. Nair and R. V. Raja Kumar, “A Least Squares based channel estimation method using superimposed training in OFDM systems,” Prof. International Conference on RF and Signal Processing Systems, pp. 100-105, Vijayawada-India, February 2008.
  47. S. M. Sameer and R. V. Raja Kumar, “A low complexity null subcarrier aided frequency offset estimation technique for OFDM," in Proc 67th IEEE Vehicular Technology Conference, VTC-2008 Spring, Singapore, May 2008.
  48. S. M. Sameer and R. V. Raja Kumar, “An efficient maximum likelihood carrier frequency offset estimation technique for OFDM systems," in Proc 13th IEEE Symposium on Computers and Communications, (ISCC-2008), Morocco, July 2008.
  49. S. M. Sameer and R. V. Raja Kumar, “An efficient near blind carrier frequency offset estimation scheme for MIMO-OFDM system," in 51st IEEE Global Communications Conference, Globecom- 2008, LA, USA, Nov-Dec. 2008.
  50. S. M. Sameer and R. V. Raja Kumar, “An efficient maximum likelihood CFO estimation scheme for MIMO-OFDM systems," in IEEE Region-10 International Conference, TENCON 2008, Hyderabad, India, Nov. 2008.
  51. S. M. Sameer and R. V. Raja Kumar, “An efficient maximum likelihood CFO estimation technique for OFDMA uplink transmissions," in 3-rd IEEE International Conference on Industrial and Information Systems, ICIIS 2008, IIT Kharagpur, India, Dec. 2008.
  52. S. M. Sameer and R. V. Raja Kumar, A bandwidth effcient carrier frequency offset estimation technique for OFDM, Proc. International Conference on RF and Signal Processing (RSPS 2008), Viayawada, , (2008)
  53. B.N. Bhandari, R. V. Raja Kumar and S. L. Maskara, “Performance of IEEE 802.16 layer Protocol under conditions of Self-Similar Traffic”, TENCON 2008, Hyderabad, India.
  54. B N Bhandari R V Raja Kumar and S L Maskara “ A Modified back-off Algorithm for the IEEE 802.11 DCF,” in Proc. International Conference on Networks, Malaysia, 2005.
  55. B. N. Bhandari, R. V. Raja Kumar, and S. L. Maskara, “ Performance of the IEEE 802.16 MAC Protocol with varying Request Back-off Start,” TENCON 2006, Hong Kong.
  56. Naidu. K. R, Ratnam V. Raja Kumar, and T. S. Lamba, \Use of Channel Prediction in Optimum Terminal Filters for a CDMA System," IEEE International Conference on Wireless and Optical Commu-nications Networks, 5 - 7 May 2008, Surabaya, East Java, Indonesia.
  57. Sameer S. M and R. V. Raja Kumar, “A Low Complexity Null Subcarrier Aided Frequency Offset Estimation Technique for OFDM,” in Proc 67th IEEE Vehicular Technology Conference, VTC-2008 Spring, Singapore, May 2008.
  58. Sameer S. M and R. V. Raja Kumar, “A Near Blind Low complexity Carrier Frequency Offset Estimator for OFDM,” in Proc. International Conference on Wireless, Mobile and Multimedia Networks, Mumbai, India, Jan. 2008
  59. Manju Sarvagya and Ratnam V. Rajakumar, “A New Packet Scheduling Algorithm and Performance Analysis of High Speed Data Access in UMTS” . IEEE Tencon 2008 Taiwan.
  60. Poonam Singh, Saswat Chakrabarti and R.V. Raja Kumar, “Analysis of MSE-OFDM System in Multipath fading channel,” ‘National Conference on Communication, NCC, 2008,’ IIT, Mumbai, Feb., 2008.
  61. Debarati Sen, Saswat Chakrabarti, R. V. Raja Kumar, “A New Timing Estimation and Compensation Scheme for Ultra-Wideband MB-OFDM Communications,” IEEE WOCN-2008, Surabaya, East Java Indonesia, May 6-8, 2008.
  62. Debarati Sen, Saswat Chakrabarti, R. V. Raja Kumar, “A New Frequency Offset Estimation Scheme for Ultra-Wideband MB-OFDM Systems,” IEEE ICACT-2008, Phoenix Park, Korea, Feb. 17-20, 2008, vol. 3, pp. 1929-1934.
  63. Debarati Sen, Saswat Chakrabarti, and R. V. Raja Kumar, “An Efficient Frequency Offset Estimation Scheme for Multi-Band OFDM Ultra-Wideband Systems,” IEEE VTC 2008-spring, Singapore, May 11-14, 2008, pp. 973-977.
  64. Debarati Sen, Saswat Chakrabarti, R. V. Raja Kumar, “A Multi-Band Timing Estimation and Compensation Scheme for Ultra-Wideband Communications,” IEEE GLOBECOM-2008, LA, USA, Nov. 30-Dec. 04, 2008.
  65. Debarati Sen, Saswat Chakrabarti, and R. V. Raja Kumar, “Mathematical analysis of signal propagation in ultra-wideband transceiver system with frequency offset correction,” IEEE PIMRC-2008, Cannes, France, Sept. 15-18, 2008.
  66. Debarati Sen, Saswat Chakrabarti, and R. V. Raja Kumar, “An Analysis of Signal Propagation in UWB Transceiver System with Frequency Offset Correction,” IEEE WiCOM-2008, Dalian, China, Sept. 19-21, 2008.
  67. Debarati Sen, Saswat Chakrabarti, R. V. Raja Kumar, “A Low Complexity Timing Estimation Scheme for Multi-Band OFDM Based Ultra-Wideband System,” IEEE ISSSTA-2008, Bologna, Italy, Aug. 25-28, 2008 .
  68. Debarati Sen, Saswat Chakrabarti, R. V. Raja Kumar, “An Energy Based Symbol Timing Synchronization Scheme for MB-OFDM Based Ultra-Wideband Communication,” IEEE ISSSTA-2008, Bologna, Italy, Aug. 25-28, 2008.
  69. Vadali, S.Chakrabarti, S.; RajaKumar, R.V., A Low Complexity PAPR Reduction Scheme without Side Information for Pilot Assisted OFDM Systems, ICIIS 2008. IEEE Region 10 and the Third international Conference onIndustrial and Information Systems, 2008, 8-10 Dec. 2008, Page(s): 1 – 4.
  70. Debarati Sen, Saswat Chakrabarti, R. V. Raja Kumar, Symbol Timing Synchronization for Ultra-Wideband (UWB) Multi-band OFDM (MB-OFDM) Systems, IEEE COMSWARE-2008, Bangalore, , IEEE (2008)
  71. S. Umesh Babu, C. S. Kumar, R. V. Raja kumar,“Sensor Networks for Tracking a Moving Object using Kalman Filtering”,” IEEE International Conference on Industrial Technology (ICIT), Mumbai, 15-17 Dec. 2006.
  72. Sarvagya and R. V. Raja Kumar, "Performance analysis of the UMTS system for packet data transfer over dedicated channels", National Conference on Communications, Jan. 27-29, 2006 New Delhi.
  73. K. Rama Naidu, R.V. Raja Kumar, and T. S. Lamba," A Multipath Transmission Diversity Scheme using Prediction-based Transmitter Filter in FDD-CDMA Systems," Proc. of IEEE International Conference on Wireless and Optical Communications Networks, Bangalore, April 2006.
  74. Jinesh P. Nair, and R.V. Raja Kumar,"Channel Estimation and Equalization based on Implicit Training in OFDM systems," Proc. of IEEE International Conference on Wireless and Optical Communications Networks, Bangalore, April 2006.
  75. Poonam Singh, R.V. Raja Kumar, and T. S. Lamba,"Performance Analysis of MC-CDMA System in Multipath Fading Channel," Proc. of IEEE International Conference on Wireless and Optical Communications Networks, Bangalore,April 2006.
  76. Poonam Singh, Saswat Chakrabarti and R.V. Raja Kumar, “A Multiple Access Scheme using MSE-OFDM with Reduced Complexity,” IEEE TENCON, 2008, Nov. 2008.
  77. Poonam Singh, Saswat Chakrabarti and R.V. Raja Kumar, “Multiple Access using MSE-OFDM,” ‘IEEE Consumer Communications and Networking conference, CCNC, 2008’ Las Vegas, Nevada, USA, Jan., 2008.
  78. Poonam Singh, R.V. Raja Kumar and T. S. Lamba, “A Novel Multiple Access Scheme for Mobile Communication Systems,” ‘Computers and Devices for Communication, CODEC,’ Kolkata, Dec., 2006.
  79. Kumar. V and R. V. Raja Kumar, "Performance Analysis of a Finite Word Length Implemented CCK MODEM with Rake Receiver for WLAN System", 1st IEEE IFIP International Conference on Internet, The Next Generation of Mobile, Wireless and Optical Communications Networks, September 26-29, 2005, Kyrgyzstan.
  80. K. Rama Naidu, Ratnam V. Raja Kumar, and T. S. Lamba," Recursive Least Squares based Bussgang Algorithms for Blind Channel Equalization," 2005 IEEE, International Technical Conference on Circuits/Systems, Computers and Communications, 4-7 July 2005.
  81. Kumar. V and R. V. Raja Kumar, "Downlink Performance Simulation of a Finite Word Length Implemented QPSK Demodulator with Rake Receiver for 3G WCDMA", 20th IEEK International Technical Conference on Circuits/Systems, Computers and Communications, Vol. 3, July 4-7, 2005, South Korea.
  82. Kumar. V and R. V. Raja Kumar, "Performance Analysis of a CCK MODEM for WLAN System under AWGN and Rayleigh Fading Channels", 20th IEEK International Technical Conference on Circuits/Systems, Computers and Communications, Vol. 2, July 4-7, 2005, South Korea.
  83. Naidu, K.R.; Kumar, R.V.R.; Lamba, T.S," A Decision Feedback Equalizer Using Channel Matched Filter for WCDMA Systems," 2005 IEEE International Conference on Advanced Communication Technology, 21-23 Feb. 2005, Phoenix Park, Korea.
  84. Naidu, K.R.; Kumar, R.V.R.; Lamba, T.S," A correlation-based blind method for estimation and equalization of down-link WCDMA channels," 2005 IEEE International Conference on Personal Wireless Communications, 23-25 Jan. 2005 Page(s):517 - 521.
  85. Sarvagya, M. ; Raja Kumar, R.V., Performance analysis of the UMTS system for Web traffic over dedicated channels, 3rd International Conference on Information Technology: Research and Education, 2005. ITRE 2005, pp. 414 - 417.
  86. B.N. Bhandari, R.V. Raja Kumar and S.L.Maskara, "Uplink Performance of the IEEE 802.16 MAC layer Protocol for varying System parameters", National Conference on Communications (NCC-2005), 28-30 January, 2005, Indian Institute of Technology, Kharagpur, India.
  87. B.N.Bhandari, R.V. Raja Kumar and S.L. Maskara, "Uplink Performance of the IEEE 802.16 Medium Access Control (MAC) Layer Protocol", IEEE International conference on Personal Wireless Communications, January 23-25, 2005, New Delhi, India.
  88. B.N.Bhandari, R.S. Banjari, R.V. Raja Kumar and S.L. Maskara, "Sensitivity of the IEEE 802.11b MAC protocol Performance to the various protocol parameters", IEEE International conference on Communications, Circuits and Systems, Chengdu, China, Vol.1, pp.359-363, June 2004.
  89. Gordhan Singh Rathore, Subhadeep Ghosh and R.V. Raja Kumar, "Robust signal detection and timing synchronization schemes for OFDM based wireless systems", Proc. National Conference on Communications (NCC-2005), pp.373-377, 28-30 January, 2005, IIT, Kharagpur, India.
  90. Venkateswara Rao Kanchi and R.V.Raja Kumar, "Performance Comparison of the Modified Viterbi Equalizer and the CMF-DFE for WMAN Applications", Proc. National Conference on Communications (NCC-2005), pp.133-136, Jan. 28-30, 2005, IIT, Kharagpur,.India.
  91. Turbo Majumder and R. V. Raja Kumar, “A modified Viterbi algorithm based equaliser for wireless metropolitan area networks”, Proceedings of IEEE International Conference on Signal Processing and Communications, SPCOM 2004, 11-14 Dec 2004, pp. 154 – 158.
  92. Arijit De, R.V. Rajakumar, Arpan Pal, Subhra Sekhar Das and Balamurali, " Synchronization Algorithms for the IEEE 802.11 a/g Wireless LAN", National Conference on Communications (NCC 2004), I.I.Sc., Bangalore, Jan. 30th - Feb. 1st 2004.
  93. B. N. Bhandari, R. S. Banjari, R. V. Raja Kumar and S. L. Maskara, "Sensitivity of the IEEE 802.11b MAC Protocol Performance to the Various Protocol Parameters", International Conference on Communications, Circuits and Systems, Chengdu, China, Vol.1, pp.359-363, June 27-29, 2004.
  94. S. Das, R. V. Raja Kumar, M.I.Rahim,A. Pal,F.Fitzek and R. Prasad, "Low Complexity Residual Phase Tracking Algorithm for OFDM-based WLAN Systems", Proc. Fourth International Symposium on Communication Systems, Networks and Digital Signal Processing, pp. 128-131, July 20-22, 2004, Electronic and Computer Engineering, University of Newcastle, UK.
  95. Kedia, A., RajaKumar, R.V.A novel decision feedback equalizer for CCK signals in fading channels, TENCON 2004. 2004 IEEE Region 10 Conference, 21-24 Nov. 2004, Vol.B, pp.505 – 508.
  96. Kumar A, Bansal M, RajaKumar R.V, "Development of a Baseband Processor for Global Third Generation Wireless Communication Systems", WPMC '03, Kanagawa, Japan, Oct. 19th -22nd 2003.
  97. Kumar A, Bansal M, Raja Kumar, RVR, A Baseband Processor for Global Third Generation Wireless Communication Systems, Prof. International Conference on Communications and Broadband Networking(ICBN), May 5-7, 2003, Bangalore.
  98. K. R. Naidu and R. V. Raja Kumar, "Fading estimation using prediction in wireless communication systems", International Conference on Wireless Communication Systems, Dec. 2002.
  99. Kumar, R.V.R., Kumar, A., Development of a CDMA system with rake receiver for the third generation wireless communication systems Personal Wireless Communications, 2002 IEEE International Conference on, pp.309 -313, Dec. 15-17, 2002.
  100. Naidu, K.R.; Kumar, R.V.R.; Lamba, T.S., Pilot based predictive cancellation of fading in CDMA systems Personal Wireless Communications, 2002 IEEE International Conference on, pp.305 -308, Dec. 15-17, 2002.
  101. Biradar, G.S.; Kumar, R.V.R., A recursive least squares blind multiuser detector for wireless systems TENCON '02. Proc. of IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering, Vol.2, pp.1000 -1003, Oct. 28-31, 2002.
  102. A. K. Tiwari and R. V. Rajakumar, "An Adaptive Lattice Algorithm for Modeling and Compression of Picture Signals" Proceedings Eighth National Conference on Communications - 2002, pp.467-472, January 25-27, 2002.
  103. Ketan Humnabadkar and R. V. Rajakumar, "Dependence of Bit Error Performance of GPRS Convolutional Codecs on Depth of the Trellis used for Decoding", Proceedings Eighth National Conference on Communications - 2002, pp.315-319, January 25-27, 2002.
  104. M.R.Shinde, R.V.Raja Kumar and S.S.Pathak, " A routing strategy involving load balancing in multi - hop lightwave networks ", Proc. National Conf. On Communications ( NCC' 98 ), pp.452 - 457, jan.29 - 31, 1999.
  105. K. M. Malladi, R.V.Raja Kumar and K.V. Rao, "Gauss-Markov model formulation for the estimation of time-varying signals and systems," IEEE-SP Intl. Symp. on TIME-FREQUENCY and TIME- SCALE Analysis, Pittsburg, Pennsylvania, Oct 7-9, 1998.
  106. R.V.Raja Kumar, " Laboratory Experiments in Digital Signal Processing", DSPS Fest -2000, Dec.2-3, 2000, Bangalore.
  107. Sreekanth Reddy and R.V.Raja Kumar, " An RLS Algorithm for Wavelet Based Estimation of Time-Varying AR Models of Signals", DSPS Fest -2000, Dec.2-3, 2000, Bangalore.
  108. Malladi, K.M.; Rajakumar, R.V., Estimation of time-varying ar models of speech through Gauss-Markov modeling, Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003 (ICASSP '03), Vol. 6, pp.VI_305 -VI_308, April 6-10, 2003.
  109. Biradar, G.S.; Kumar, R.V.R., A recursive least squares blind multiuser detector for wireless systems TENCON '02. Proc. of IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering, Vol.2, pp.1000 -1003, Oct. 28-31, 2002.
  110. Kumar, R.V.R.; Kumar, A., Development of a CDMA system with rake receiver for the third generation wireless communication systems Personal Wireless Communications, 2002 IEEE International Conference on, pp.309 -313, Dec. 15-17, 2002.
  111. Dr. R.V. Rajakumar, Arpan Pal. Theory, Performance and Design Issues in OFDM systems, Tutorial Session in NCC, IISc. Bangalore, India, January, 2004.
  112. Suvra S. Das,Ratnam V.Rajakumar, Muhammad I.Rahman, Arpan Pal, Frank H.P. Fitzek, Ole Olsen, Ramjee Prasad. Low Complexity Residual Phase Tracking Algorithm for OFDM based WLAN Systems, CSNDSP Symposium 2004, Fourth International Symposium 20 - 22 July 2004

Important and Select Sponsored Research Projects Executed

  1. A cognitive spectrum allocation method for cellular, Vodafone Essar, May 2009 to May 2012.
  2. Energy efficient radio for next generation cellular, Vodafone Essar, May 2009 to May 2012.
  3. Self-configuring Networks: Flexible spectrum sharing for Next Generation Mobile-communication Systems, Vodafone Essar, May 2009 to May 2012.
  4. Development of Autonomous Underwater Vehicle, DOD, Mar.’03 to Feb.06
  5. A Personalized Selective Access Info. System, MHRD, 2003 to Apr.’2005.
  6. Turbo and other imp. FEC Cod. Sc. and DD, ISRO, Mar.’03 to Feb.‘05
  7. DSP Architectures for Software Radio, 2002-2003.
  8. Modernization of DSP and Communication Systems Laboratories, MHRD, 2000- 2002
  9. Advanced Radio and Multimedia Communications, 1996 - 99.
  10. Fibre-optic System Application Promotion Program (FOSAPP), 1987 - 94.
  11. TELEMATICS, 1989 - 98.
  12. Education and Research Network (ERNET), 1995 – 96.

Important and Select Consultancy Projects Executed on Invitation

  1. Creation of an R&D Plan for developing SDR and Cognitive Radio for DEAL, DRDO, 2007.
  2. Development of Voice Codecs, DEAL, DRDO, 2005-06.
  3. Evaluation of Weapon and Fire Control Algorithms, NSTL, DRDO, 2003.
  4. Development of WLAN (IEEE 802.11b), National Semiconductor Corpn, Santa Clara, USA, Nov.'02 to Oct.'03.
  5. IEEE 802.11a WLAN Phy. Layer development, Tata Consultancy Services May '03 to Apr.'04.
  6. Audio and Video Compression, DPS Technologies, Kolkata, 2001-2002.
  7. Architecture of an ASIC for Rake Receiver of UMTS, National Semiconductor Corpn, Santa Clara, USA, 2000-2001.
  8. Analysis and Design of a Detection System, NSTL, DRDO, 1994 - 97.
  9. Design of a CDMA Data Link, DLRL, DRDO, 1997 - 98.
  10. On the development of proximity fuse, NSTL, DRDO, 1992-93.

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