The current issue of the IETE Journal of Research (Vol.60, No.2, Mar-Apr. 2014) contains 10 articles. These articles present on-going research and developments taking place in the broad areas of Electromagnetics, Communication Engineering, Bio-medical Engineering, and Electrical Engineering.
In the paper “Optimization and development of O-shaped triple-band microstrip patch antenna for wireless communication applications,” the authors give the design of a triple-band patch antenna for wireless communication applications. The antenna covers three different bands that are suitable for WLAN, ISM, IMT ITS and other applications. The antenna performance was studied in terms of return loss and VSWR through simulations using electromagnetic simulation software. The antenna was fabricated and its performance is compared with the simulation study.
The following paper titled “Performance analysis of a cooperative MAC protocol of wireless ad hoc networks,” presents a cooperative MAC priority protocol that uses the priority value of upper layers to select different paths to nodes in a wireless ad hoc network. A Markov chain model is given to analyze the performance of the protocol. The authors also give a closed-form solution for a saturated system throughput and the energy consumption. The performance is verified through simulation results.
The paper on “New combined adaptive (NCA) algorithm for smart antenna system applications,” gives an algorithm for improving the performance of smart antenna systems in mobile communications. The NCA algorithm uses a proposed initialization with a modified version of the normalized least squares (NLMS) algorithm to achieve improved interference suppression compared to the NLMS algorithm. The algorithm has been tested with additive white Gaussian noise and Rayleigh fading channels.
The paper on “Cuckoo search algorithm for emission reliable economic multi objective dispatch problem,” is concerned with the emission, reliable, economic dispatch (ERED) problem using the multi-objective cuckoo search algorithm. The multi-objective function forms a non-smooth and non-convex surface for which the optimal solution is given using the cuckoo search algorithm. The optimal solution is studied on a 6-unit benchmark system and two IEEE bus systems. The results have also been compared with other existing solutions.
The paper “A fully-integrated dual band CMOS power amplifier using a variable switched interstage matching network” presents the design of a dual band two-stage amplifier for WLAN and Wi-MAX applications. The dual band design is area efficient as it reduces the requirement for off-chip matching networks. Further, the power amplifier does not use any off chip component. The performance evaluation is given using simulation studies and measurements. It is also compared with other reported specifications.
The following paper on “False data elimination in heterogeneous wireless sensor networks using location-based selection of aggregator nodes,” is concerned with the problem of eliminating injected false data in heterogeneous wireless sensor networks that may otherwise compromise on data integrity and reduce bandwidth and power efficiency. The paper also investigates the problem of battery drain at aggregator nodes.
The paper on “Voice pathology assessment systems for dysphonic patients: detection, classification and speech recognition,” deals with the task of diagnosing patients for sulcus, cyst, polyp, GERD and vocal cord paralysis from their voice. A software system has been designed to detect and classify voice disorders and recognize digits from word utterances instead of the more commonly used sustained vowel utterances. Different features such as MFCC, LPCC, RASTA, and PLP are used along with SVM classifier and the results are compared.
The following paper titled “A novel image fusion system for multi-sensor and multiband remote sensing data” presents an image fusion system for synthesizing images that are not feasible to be obtained with a single remote sensing satellite image. Different fusion methods are given for different combinations such as PAN sharpening, SAR sharpening, high resolution SAR with panchromatic image, multi-polarization SAR images and ascending pass SAR image with descending pass SAR images. The fused images are compared visually for performance estimation.
In the next paper on “The real implementation of ANFIS channel equalizer into the system of software defined radio,” the authors present an adaptive neuro- fuzzy inference system (ANFIS) for channel equalization and BER reduction in communications. The ANFIS channel equalizer is implemented on a PXI platform. The paper presents experimental results for QAM modulation schemes and comparisons with other equalizers such as LMS based ones in terms of BER performance.
The last paper “Polynomial basis multiplier using cellular systolic architecture” presents polynomial basis Montgomery multiplier architecture over Galois fields using cellular semi-systolic hardware. The proposed Montgomery multiplication algorithm can exploit parallelism by computing through two independent parts simultaneously. The area complexity comparison in terms of total transistor count and time complexity comparison have been done with other architectures.