Papers by Ramachandran Venkatesan
Flow Assurance Challenges in Deepwater Gas Developments
Proceedings of Asia Pacific Oil and Gas Conference and Exhibition, 2007
Modeling Wind Field and Pollution Transport over a Complex Terrain Using an Emergency Dose Information Code SPEEDI
Journal of Applied Meteorology, 1997
Atmospheric dispersion code system SPEEDI (System for Prediction of Environmental Emergency Dose ... more Atmospheric dispersion code system SPEEDI (System for Prediction of Environmental Emergency Dose Information) has been applied to simulate the field experiments conducted over a complex terrain. A diagnostic mass-consistent wind field model of the code system simulates the flow over an isolated hill using the routinely measured data from sodars and a meteorological tower. An objective basis for the adjustment
Performance Evaluation of the Multicast Balanced Gamma (BG) Switch
In this paper, we present the performance evaluation of arecently proposed multicast switch archi... more In this paper, we present the performance evaluation of arecently proposed multicast switch architecture forbroadband communications. Using distributed control and amodular, multistage design, the multicast Balanced Gamma(BG) switch features a high performance for unicast,multicast and combined traffic under both uniform and non-uniform traffic conditions. The key features of the multicastBG switch are that, although it has buffers on input andoutput
WiMAX Signal Detection Algorithm Based on Preamble-Induced Second-Order Cyclostationarity
Global Telecommunications Conference, . GLOBECOM . IEEE, 2010
In this paper we present a new algorithm for detecting mobile Worldwide Interoperability for Micr... more In this paper we present a new algorithm for detecting mobile Worldwide Interoperability for Microwave Access (WiMAX) signals in cognitive radio systems, which is based on preamble-induced second-order cyclostationarity. We derive closed form expressions for the cyclic autocorrelation function (CAF) and cyclic frequencies (CFs) due to the preamble, and use these results in the proposed algorithm for signal detection. The
Balancing between robustness and energy consumption in underwater acoustic sensor networks
2015 IEEE Wireless Communications and Networking Conference (WCNC), 2015
Development of an artificial neural network based induction motor speed estimator
Seminars in Colon and Rectal Surgery, 1996
This paper derives two functional relationships between the stator quantities and speed from the ... more This paper derives two functional relationships between the stator quantities and speed from the induction motor dynamic equations. As singularities are present in these relationships, direct estimation of speed using artificial neural networks (ANNs) with these stator inputs is not possible. This paper proposes a scheme which employs two ANNs to recover motor speed. An added benefit of this scheme
Estimation of Extreme Water Levels Due to Cyclonic Storms: A Case Study for Kalpakkam Coast
The International Journal of Ocean and Climate Systems, 2010
... AD Rao, Indu Jain and R. Venkatesan* Centre for Atmospheric Sciences, Indian Institute of Tec... more ... AD Rao, Indu Jain and R. Venkatesan* Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India * IGCAR, Department of Atomic Energy, Kalpakkam-603 102, India ... AD Rao, Indu Jain and R. Venkatesan 3 ...
Joint signal detection and classification of mobile WiMAX and LTE OFDM signals for cognitive radio
2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers, 2010
ABSTRACT Spectrum awareness is one of the most challenging tasks in cognitive radio (CR). To adeq... more ABSTRACT Spectrum awareness is one of the most challenging tasks in cognitive radio (CR). To adequately adapt to the changing radio environment, it is necessary for the CR to be able to perform joint detection and classification of low signal-to-noise ratio (SNR) signals without requiring much a priori information on the signal parameters. In this paper, we propose a joint detection and classification algorithm for the mobile Worldwide Interoperability for Microwave Access (WiMAX) and Long Term Evolution (LTE) signals. The algorithm has the advantage that it requires relaxed information on the signal parameters. Simulation results are presented, which show the efficiency of the proposed algorithm under diverse scenarios.
Proceedings of the 1996 IEEE IECON. 22nd International Conference on Industrial Electronics, Control, and Instrumentation, 1996
This paper proposes two techniques for speed estimation of induction motors using artificial neur... more This paper proposes two techniques for speed estimation of induction motors using artificial neural networks. The techniques are based on speed expressions obtained from the induction motor dynamic equations. Two of the equations obtained have singularities, and hence direct speed estimation from these is not possible. The paper proposes a scheme using two ANNs to recover the speed from these two equations. However, it is possible to combine these two equations in a way that removes the singularities. Another method, based on this equation, is presented for obtaining the speed directly from the output of an ANN. These methods are general and easily implementable using commercially available ANN devices.
Induction motor speed estimation using artificial neural networks
Proceedings of 1996 Canadian Conference on Electrical and Computer Engineering, 1996
This paper derives two functional relationships between the stator quantities and speed from the ... more This paper derives two functional relationships between the stator quantities and speed from the induction motor dynamic equations. As singularities are present in these relationships, direct estimation of speed using artificial neural networks (ANNs) with these stator inputs is not possible. The paper proposes a scheme which employs two ANNs for this purpose. The outputs of the two ANNs are
Delivery analysis of multicasting in BitTorrent enabled ad hoc network (MBEAN) routing
Proceeding of the 2006 international conference on Communications and mobile computing - IWCMC '06, 2006
... John's, NL, Canada A1B 3X5 [email protected] ... The algorithm implementing MBEAN ro... more ... John's, NL, Canada A1B 3X5 [email protected] ... The algorithm implementing MBEAN routing protocol has been simulated using one of the commonly used simulation tools, namely, network simulator (ns-2), initially developed by re-searchers at UCB with the wireless ...
An Improved Communications Model for Underwater Sensor Networks
IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference, 2008
... John's, NL, Canada Email: (peter.king,venky,licheng)@mun.ca ... Furthermore, we conduct ... more ... John's, NL, Canada Email: (peter.king,venky,licheng)@mun.ca ... Furthermore, we conduct case studies using real environment data from Newfoundland in the Atlantic Region to demonstrate the differences between the proposed model and commonly used NS-2 models, which ...
A study of channel capacity for a seabed underwater acoustic sensor network
OCEANS 2008, 2008
... Peter King, Ramachandran Venkatesan, and Cheng Li Faculty of Engineering and Applied Science ... more ... Peter King, Ramachandran Venkatesan, and Cheng Li Faculty of Engineering and Applied Science Memorial University of Newfoundland St. John's, NL, Canada Email: (peter.king,venky,licheng)@mun.ca ... N(f) = Nt(f) + Nw(f) + Ns(f) + Nth(f). (4) ...
Atmospheric Research, 2009
Meteorological measurements were carried out at North Chennai semi rural area during pre-monsoon ... more Meteorological measurements were carried out at North Chennai semi rural area during pre-monsoon period as a part of an air quality study program. Analysis of the data showed the effects of coastal terrain namely the land-sea breeze circulation, temperature cooling during the sea breeze, difference in onset times at these sites etc. Sea breeze onset was observed with a sharp
Cyclostationarity-Based Detection of LTE OFDM Signals for Cognitive Radio Systems
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010
ABSTRACT In this paper, a distinctive cyclostationarity-based feature of the Long Term Evolution ... more ABSTRACT In this paper, a distinctive cyclostationarity-based feature of the Long Term Evolution (LTE) Orthogonal Frequency Division Multiplexing (OFDM) signals used in the Frequency Division Duplex (FDD) downlink transmission is proved, and further employed for their detection. This relates to the existence of the reference signals (RSs) used for channel estimation and cell search/acquisition purposes. The analytical closed form expressions for the RS-induced cyclic autocorrelation function (CAF) and cyclic frequencies (CFs) are derived. Based on these findings, a signal detection algorithm is then developed. Simulation results show that the proposed algorithm achieves a good detection performance for low signal-to-noise ratios (SNRs), short sensing times, and under diverse channel conditions.
Journal of Chemical Sciences, 1998
The synthesis, spectral, magnetic and electrochemical properties of a series of binuclear Cu(II) ... more The synthesis, spectral, magnetic and electrochemical properties of a series of binuclear Cu(II) complexes of new unsymmetrical binucleating ligands (H2L1, H2L2) are described where H2L1=4-methyl-2-[N-methyl piperazin-1-yl) methyl]-6-[(prolin-1-yl)-methyl] phenol and H2L2=4-bromo-2-[N-methyl piperazin-1-yl)methyl]-6-[(prolin-1-yl)]-methyl] phenol. The exogenous ligands were incorporated into the complexes: hydroxo [Cu2 L(OH)(H2O)2] ClO4·H2O (L1=1a, L2=1b), acetato, [Cu2L(OAc)2]·H2O (L1=2a, L2=2b), nitrito, [Cu2(L(NO2)2(H2O)2] (L1=3a, L2=3b), azido, [CuL(N3)2]·3H2O (L1=4a, L2=4b). Complexes 1a,
Implementation of Vector Floating-point processing unit on FPGAs for high performance computing
2008 Canadian Conference on Electrical and Computer Engineering, 2008
A vector floating point unit (VFPU) for high accuracy scientific computing is reported. The core ... more A vector floating point unit (VFPU) for high accuracy scientific computing is reported. The core module, a vector register file, is divided into eight lanes. One lane contains 16 vector registers, each including 16times32-bit elements, and is connected to a floating point adder and a floating point multiplier. A flag register is used to indicate the calculation sequence for the
BEAN - BitTorrent enabled ad hoc networks
WiMob'2005), IEEE International Conference on Wireless And Mobile Computing, Networking And Communications, 2005., 2005
... BEAN BitTorrent Enabled Ad Hoc Networks Paul Gillard, Member, IEEE, Padmini Vellore, Studen... more ... BEAN BitTorrent Enabled Ad Hoc Networks Paul Gillard, Member, IEEE, Padmini Vellore, Student Member, IEEE, and Ramachandran Venkatesan, Senior Member, IEEE A 0-7803-9182-9/05/$20.00 ©2005 IEEE. - 186 - ... 2, 3, 7, 28. [10] CSR Murthy and BS Manoj, Ad ...
GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference, 2009
In this paper, we propose a new method, called Load-Aware Channel Assignment Exploiting Partially... more In this paper, we propose a new method, called Load-Aware Channel Assignment Exploiting Partially Overlapping Channels (Load-Aware CAEPO), which uses not only non-overlapping channels but also partially overlapping channels. We further improve our scheme by introducing the concept of node grouping to enhance the performance, and develop another new channel assignment algorithm called Load-Aware CAEPO-G. Simulation results demonstrate that our proposed schemes can significantly improve the aggregated network performance.
This paper presents the architecture design as well as the performance analysis of a new cell-bas... more This paper presents the architecture design as well as the performance analysis of a new cell-based multicast switch for broadband communications. Using distributed control and a modular design, the Balanced Gamma (BG) switch features a high performance for unicast, multicast and combined traffic under both random and bursty conditions. Although it has buffers on input and output ports, the multicast BG switch follows predominantly an output-buffered architecture. The performance is studied under uniform and non-uniform multicast traffic in terms of cell loss ratio and cell delay. The results are compared with those from an ideal pure output-buffered multicast switch to demonstrate how close its performance is to that of the ideal but impractical switch. Comparisons with other published switches reveals the superior of the BG switch and the tradeoffs between complexity and performance in a packet switch design. It is shown that the multicast BG switch achieves a performance close to...
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Papers by Ramachandran Venkatesan