The current issue of the IETE Journal of Research (Vol.61, No.6, November–December 2015) contains 15 articles. These articles present on-going research and developments taking place in the broad areas of Electrical Engineering, Communication Engineering, Information Technology, Electromagnetics and Computer Science and Engineering.
The paper ‘Active Rectifier-based Harmonic Compensator for a Direct Torque Controlled Induction Motor Drive’, gives the design of an active front-end rectifier for the dual purposes of AC to DC conversion and harmonic compensation for improving power quality. The inverter in the drive uses 5-level direct torque controller for induction motor control. The efficacy of harmonic compensation is demonstrated through current total harmonic distortion measure.
In the paper titled ‘An Assessment of SPSS Grid Interfaced SPV System under Abnormal Grid Conditions’, a PLL-less control algorithm is given for wide variation in grid voltage condition for solar photo-voltaic array interfaced with a single-phase single-stage grid. The fast voltage changes in the grid are taken care of by including a feed-forward term in the control algorithm. The paper demonstrates the operation of the solar energy conversion system under abnormal grid conditions.
In ‘An Efficient Calibration Scheme for Satellite Onboard Receive Digital Beamformer’, a fast calibration scheme for the receive digital beamformer system on a satellite is presented. The system consists of a phased array antenna of arbitrary topology, receive RF electronics and digital beamforming processor. The performance has been studied through simulations under different SNR, initial phase and amplitude error conditions.
The paper ‘ANN-based Hand Gesture Recognition Using Self Co-articulated Set of Features’, addresses the problem of hand gesture recognition that is useful for human and machine interaction. The authors use a proposed set of features that includes the number and orientation of self co-articulation strokes that are unwanted strokes, and an artificial neural network based classifier. The performance has been studied through experimentation with 40 gestures.
In the paper titled ‘Ant-based Integrated Traffic Control and Management in ATM Networks’, an efficient traffic management scheme for ATM networks is presented. It controls the occurrence of congestion and allocates bandwidth for different traffic services in a prioritized manner while monitoring the quality of service requirements of the different traffic classes. The performance of the scheme is studied in simulation environment and compared with existing architectures in terms of packet loss, packet throughput and end-to-end delay parameters.
The paper ‘C-shaped Complementing Patch Antenna for Broadband Communications’, deals with the design of an optimized planar CPW fed complementing C-shape patch antenna. The specifications are achieved with an artificial neural network or simulated annealing based optimization methods. The results are compared with electromagnetic simulations and prototype measurements.
In the paper ‘Detection of Attacks for IDS using Association Rule Mining Algorithm’, the authors present an association rule mining algorithm for an intrusion detection system for detecting different types of network attacks. The performance of the algorithm is studied using KDD Cup 1999 dataset for various kinds of attacks and is compared with previous algorithms in terms of detection rate and false positives.
The paper on ‘Extended Rice code and its application to R-tree compression’ gives a method for variable length coding of non-negative integers based on the approach of Rice code and fast extended Golomb code. The method is used to compress the coordinates in R-tree structure for indexing spatial data. It is used to represent small, middle, and large range of numbers. The compression performance is studied and compared with other coding methods.
In the paper ‘Near-optimal Estimates for Modeling Kurtosis-matched GGL in TH-UWB Multiuser Systems’, a method for near-optimal estimation of a generalized Gaussian-Laplacian distribution is presented. The estimation is based on the method of moment estimation (MME). Its utility is in the context of multi-user interference modeling in an ultra-wideband (UWB) system. The paper considers an approach of MME combined with kurtosis matching to accurately model the impulsive characteristic of multi-user interference and noise. The performance is compared with other UWB receivers.
The paper ‘Novel DS-UWB Partial Rake Receiver over Different UWB Channels’ studies the performance of an ultra-wideband (UWB) system using reduced complexity Rake receiver. The Rake receiver uses either partial combining (PRAKE) or selective combining (SRAKE) methods that are compared in terms of complexity, resolvability of multipath. The authors also study modifications of the PRAKE algorithm so that the performance improves further. The performance is studied for different channel conditions.
The paper ‘On the Adaptive Sum-capacity of Distributed Multiple Access with Individual CSI’ presents the estimation of power-controlled adaptive sum capacity i.e. the maximum throughput achievable, for several classes of block-fading multiple access channel. A block fading multiple access channel (MAC) is considered in which each transmitter is aware of its own link channel state information (CSI) only, while the receiver has access to the complete CSI of all the links. The schemes have certain useful properties that are also discussed in the paper.
In the paper ‘Optimal Operating Condition for Co-located Device-to-Device Paris’, the problem of device-to-device communication is studied with the aim of reducing or eliminating interference between the devices and the cellular user equipment. The operating condition for D2D pairs deployed in the same region is derived and a lower bound on the throughput of D2D pair networks and the optimal number of D2D pairs that can coexist is derived in the paper.
The paper ‘Optimizing SU Transmission Time under Collision Constraint Considering PU Returns’ presents an analytical framework for secondary user's spectrum access. It relates to the problem of finding the optimum transmission time for secondary users in cognitive radio networks to maximize transmission efficiency. The amount of interference between the primary user and a secondary due to the primary user's returns is derived and the probabilities of collision and transmission efficiency are given that is useful for obtaining the optimum transmission time.
The paper ‘Power System Stability Improvement in Presence of Renewable Energies and TCSC’ considers the use of thyristor controlled series capacitor (TCSC) for flexible alternating current transmission system. It considers wind and other distributed generators as hybrid energy production systems and studies the stabilization of the power system using TCSC. The quality of power supply, power system security and stability are studied in the paper.
The paper ‘Underwater Sensor Network Positioning Using an AUV Moving on a Random Waypoint Path’ gives a localization scheme for underwater acoustic sensor networks using autonomous underwater vehicle (AUV). The AUV moves on a random waypoint path and uses directional acoustic beams with fixed steering angle and width to localize sensor nodes, while the sensor nodes use received message sequences from the AUV beams to localize themselves. The efficacy of the scheme has been studied through simulations in which different beam width, transmission intervals etc. have been considered.