Papers by Muralidhar Kulkarni
IET Communications, 2014
In this study, bit error rate (BER) performance of multiple input multiple output (MIMO) systems ... more In this study, bit error rate (BER) performance of multiple input multiple output (MIMO) systems employing transmit antenna selection with maximal ratio combining (TAS/MRC) and orthogonal space time block codes (OSTBC) is analysed and compared. Analysis has been done for several modulation schemes in equicorrelated Rayleigh fading channels. Novel infinite series expressions for BER of TAS/MRC are proposed in this work. The authors observe that the existing literature on performance analysis of TAS/MRC in correlated channels implicitly or explicitly assume no correlation on the transmitter side. In this work the authors overcome this shortcoming. An alternate closed-form expression for BER performance of OSTBC MIMO systems is derived. This closed-form expression is computationally efficient than existing expressions. Monte Carlo simulations were performed to validate the analytical results. It has been observed that TAS/MRC outperforms OSTBC in terms of BER performance in equicorrelated Rayleigh fading channel. As a case study, performance comparison of cognitive radio (CR) links employing OSTBC and TAS/MRC MIMO systems is investigated in order to show the usefulness of the present analytical study. Even though TAS is the optimum transmit antenna technique in terms of BER performance, OSTBC seems to be a promising alternative for more realistic scenarios in CR systems.
ModQUIC protocol performance verification with CUBIC and BBR congestion control mechanisms
International Journal of Internet Protocol Technology
An electronically switchable UWB to narrow band antenna for cognitive radio applications
Microwave and Optical Technology Letters
Omega Shaped Complementary Split Ring Resonator Loaded Bandwidth Reconfigurable Antenna for Cognitive Radio Applications
Procedia Computer Science
Data Aggregation using Compressive Sensing for Energy Efficient Routing Strategy
Procedia Computer Science
Modified QUIC protocol for improved network performance and comparison with QUIC and TCP
International Journal of Internet Protocol Technology
Range Adjustable Hybrid Multi Path Routing Algorithm for WSNs
International Journal of Sensor Networks
Improved network survivability using multi-threshold adaptive range clustering M-TRAC algorithm for energy balancing in wireless sensor networks
ABSTRACT
MIMO radar with spatial-frequency diversity for improved detection performance
2010 INTERNATIONAL CONFERENCE ON COMMUNICATION CONTROL AND COMPUTING TECHNOLOGIES, 2010
MIMO Radar with Spatial-Frequency Diversity for Improved Detection Performance Kiran V. Shanbhag ... more MIMO Radar with Spatial-Frequency Diversity for Improved Detection Performance Kiran V. Shanbhag Debasish Deb Muralidhar Kulkarni Department of ECE LRDE, Bangalore-560 093 Department of ECE NITK, Surathkal Email:[email protected] NITK, Surathkal ...
Multi Threshold Adaptive Range Clustering (M-TRAC) algorithm for energy balancing in wireless sensor networks
2012 Ninth International Conference on Wireless and Optical Communications Networks (WOCN), 2012
Integration of LwIP Stack over Intel(R) DPDK for High Throughput Packet Delivery to Applications
2014 Fifth International Symposium on Electronic System Design, 2014
A Dual Mode Uplink and Downlink Scheme for WiMAX
International Conference on Computational Intelligence and Multimedia Applications (ICCIMA 2007), 2007
A Dual mode Uplink and Downlink Scheme for WiMAX Inderjeet Kaur Kamal Thakur ... [6] Batra A., Ba... more A Dual mode Uplink and Downlink Scheme for WiMAX Inderjeet Kaur Kamal Thakur ... [6] Batra A., Balakrishnan, Improvements to the multi-band OFDM physical layer, IEEE, Consumer Communications and Networking Conference 2006, Vol 2, Jan 2006, pp 701 705. 351
Performance comparison of hard and soft-decision turbo coded OFDM systems
2010 IEEE International Conference on Wireless Communications, Networking and Information Security, 2010
... 664-668, Aug. 2002 [6] Shahram TalakoubLeila Sabeti, Behnam Shahrrava, and Majid Ahmadi, &quo... more ... 664-668, Aug. 2002 [6] Shahram TalakoubLeila Sabeti, Behnam Shahrrava, and Majid Ahmadi, "A linear Log-MAP algorithm for turbo decoding and turbo equalization," IEEE Int. Conf. on Wireless and Mobile Computing, Networking and Communications, Vol. ...
Mobile Ad hoc wireless networks (MANETs) assume no existing infrastructure is available for routi... more Mobile Ad hoc wireless networks (MANETs) assume no existing infrastructure is available for routing packets end-to-end in a network and instead rely on intermediary peers. The nodes in MANET are subject to various attacks that range from naïve eavesdropping to vicious battery draining attacks. Routing Protocols, data, bandwidth and battery power are the common target of theses attacks. This paper gives an overview of seven such secure routing protocols by presenting their characteristics and functionality along with their respective merits and drawbacks. A Comparison of these protocols is also presented based upon certain security parameters.
This paper describes the method to determine the frequency of an UWB (Ultra Wide Band) wave at wh... more This paper describes the method to determine the frequency of an UWB (Ultra Wide Band) wave at which the wave can cross the biological tissue with limited losses and deformation. A study on the influence of frequency variation in signal attenuation is carried especially at interfaces air-tissue and tissue-air. The biological tissue which is characterized by its thickness, its relative dielectric constant and its conductivity, is a sample of fat, localized at a distance of the antenna source which guarantees the inexistence of the attenuation at the amplitude of the electromagnetic fields in the air region. The thickness is about 2.8 cm but the conductivity and the dielectric constant vary with the frequency. The sample is localized in the middle of interest area and it is 50 cm away from transceiver antenna which send signal. A comparison is carried while applying double signals, one is a Gaussian monocycle pulse and other is a simple Gaussian pulse plane and uniform which normally tackles the surface of the samples. To calculate the attenuation of the wave in the biological tissue, we must simulate their propagation by solving Maxwell's equation in these environments. Several methods have been used such as Finite Element Method (FEM) and the Finite Differences Time Domain (FDTD) method.
A Turbo-encoded Optical Code division Multiple Access(OCDMA) system has been simulated and an app... more A Turbo-encoded Optical Code division Multiple Access(OCDMA) system has been simulated and an application specific design process has been proposed to implement a Turboencoded OCDMA modulated using Binary Pulse Position Modulation (BPPM) for transmission over optical fiber channels. The design process follows a modular approach and consists of four distinct modules RSC (Recursive Systematic Code) encoder, Pseudorandom Interleaver, Parallel to Serial Converter, BPPM circuit. A reference system has been designed for a frame size of 16 bits. Bit error rates were calculated for this reference design, assuming 10 simultaneous users using 5 iterations of the MAP decoding algorithm at various values of SNR for the two obtainable code rates (1/2; 1/3).
Congestion control mechanism is solely responsible for maintaining the performance of streaming d... more Congestion control mechanism is solely responsible for maintaining the performance of streaming data. However, when there is no congestion, a regular delivery window update is followed as a step by step process. The process can be improved by individual window update along with acknowledgement (ACK) as feedback to the server even in the absence of congestion. To achieve maximum throughput and minimum delay, we have suggested modification in the existing handshaking mechanism of quick UDP internet connections (QUIC) protocol. This paper presents an investigation of QUIC protocol performance and proposes a modified QUIC (ModQUIC): a modification in existing handshaking mechanism of QUIC to reduce control overhead. Chromium server-client model testbed setup results, show that the proposed technique gives stable output and improves performance in terms of overall throughput and delay over QUIC and transmission control protocol (TCP). Performance has been tested for limited (2 Mbps) and sufficient (10 Mbps) link bandwidth in presence of loss. The validation of results has been carried out with the help of linear regression model. The result show a throughput improvement of 35.66% and 51.93% over QUIC and TCP respectively and also the delay is reduced by 3% to 5% over QUIC and TCP. popular text books in microwave and radar engineering, communication systems, digital communications and information theory and coding. His teaching and research interests are in the areas of digital communications, fuzzy digital image processing, optical communication and networks and computer communication networks.
Carrier frequency offset (CFO) in orthogonal frequency division multiplexing systems results in h... more Carrier frequency offset (CFO) in orthogonal frequency division multiplexing systems results in heavy degradation to the system performance. Pulse shaping and Maximum likelihood estimation (MLE) are two of the several techniques available in the literature for reducing the undesired effects caused by CFO using inter carrier interference (ICI) cancellation and CFO correction respectively. In this paper, we combine these two techniques to cancel ICI further, thereby achieving a better bit error rate (BER) performance than the BER achieved by either of the two above mentioned schemes. It has been shown that around 1.7 dB BER performance improvement could be achieved using the new hybrid scheme as compared to MLE technique with low pass filtering. Further, the hybrid scheme adopted in this work is less sensitive to CFO compared to pulse shaping scheme.
Ensuring energy efficiency, data reliability, and security is important in wireless sensor networ... more Ensuring energy efficiency, data reliability, and security is important in wireless sensor networks (WSNs). A combination of variants from the cryptographic secret sharing technique and the disjoint multipath routing scheme is an effective strategy to address these requirements. Although Shamir's secret sharing (SSS) provides the desired reliability and information-theoretic security, it is not energy efficient. Alternatively, Shamir's ramp secret sharing (SRSS) provides energy efficiency and data reliability, but is only computationally secure. We argue that both these approaches may suffer from a compromised node (CN) attack when a minimum number of nodes is compromised. Hence, we propose a new scheme that is energy efficient, provides data reliability, and is secure against CN attacks. The core idea of our scheme is to combine SRSS and a round-reduced AES cipher, which we call "split hop AES (SHAES)". Both the simulation results and the theoretical analysis are employed to validate the near-sink CN attack, and a secure reliable scheme using SHAES is proposed.
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Papers by Muralidhar Kulkarni