IJSPR: Volume 05 Number 01
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IJSPR - Volume 05, Number 01

Published On : November 2014
SNo. Paper Title & Authors Page
Abstract: In this innovative information age, high data rate and strong reliability features our wire-less communication systems and is becoming the dominant factor for a successful deployment of commercial networks. MIMO-OFDM a new wireless broadband technology, has gained great popularity for its capability of high rate transmission and its robustness against multipath fading and other channel impairments. A major challenge to MIMO-OFDM systems is how to obtain the channel state in-formation accurately and promptly for coherent detection of information symbols and channel synchronization. A complex equivalent baseband MIMO-OFDM signal model is presented by matrix representation. This review paper addresses the wireless location problem which is mainly based on the OFDM technology. It is assumed that the observation data is corrupted by a zero-mean additive white Gaussian noise with a very small variance. Under this assumption, the noise term in the quasi-liner form is proved to hold a normal distribution approximately. Hence the ML (maximum-likelihood) estimation and the LS-type solution are equivalent.
Keywords— Channel Estimation, OFDM, Sparse, Channel estimation, Orthogonal Matching Pursuit.
Abstract: In this paper performance characterisation of microstrip antenna array with aperture coupled feeding technique is investigated. The antenna array is designed to operate at dual band frequencies of 3.12 GHz and 4.8GHz. The performance is analysed based on return loss, VSWR, radiation characteristics and bandwidth. The proposed antenna array design uses aperture coupled feeding and Frequency Selective Surface (FSS) as superstrate layer. Microstrip patch and coupling aperture simultaneously leads to produce dual band operation. The slot in antenna layer is designed in such a way that it is capable of producing dual band frequency of operation. This FSS consists of square metal patches. The FSS along with aperture coupled feeding technique significantly reduces back lobe radiation and side lobe level of microstrip antenna array. Also high directivity and wide bandwidth are achieved only by using FSS. A parametric analysis is done to find the appropriate height at which the FSS layer must be placed from the radiating element and the dimension of the square patches in the FSS. Using FSS in two element and four element microstrip antenna arrays resulted in improvement of |S11|dB by 4dB and 5dB, radiation characteristics by 11dB and 17 dB and bandwidth by 3.5 % and 5 %. Both the simulated and measured results are in good agreement with each other.
Keywords— aperture coupled feeding, dual band, microstrip antenna array, FSS, |S11|, radiation characteristics.
Abstract: This paper presents design of MEMS based energy scavenger that detects ambient vibrations and also converts the vibration energy into electrical energy using piezoelectric material. The major load components of highway bridges are dead loads, live loads (static and dynamic), environmental loads (temperature, wind, earthquake) and other loads (collision, emergency braking). Avoiding resonance disasters is a major concern in every structure. It is intended to develop cantilever based energy scavenger by deposition of piezoelectric material to monitor the vibrations and convert the same into electrical energy. The cantilever of E shaped has been designed and simulated with dimensions of 3.332mm x1.180mm for loading on bridges. The materials play a vital role in sensitivity of the device and PZT 5H is selected on the basis of material analysis carried out. The voltage generation of about 3.12 mV and Z-displacement of 4.03μm has been recorded at 100 Hz of frequency.
Keywords— MEMS, Vibration Energy scavenger, PZT.
Abstract: The switching power converters (SPCs) are widely used nowadays and it is a major cause for conducted noises. This paper proposes a conducted noise reduction in randomly switched flyback converters using Field Programmable Gate Array (FPGA) based Pipelined Sigma Delta Modulation (PSDM). The system uses PSDM which reduces the levels of conducted noises by oversampling and noise shaping concepts. The increasing performance, the flexibility, programmability and cost reduction of FPGA technology has made it apt for SPC applications. The proposed converter has been simulated and implemented using FPGA based controller. The Power Spectral Density (PSD) and noise spectrum results show that the conducted noise level has been effectively reduced.
Keywords— Noise Reduction, EMI, EMC, PWM, FPGA, Flyback Converters, PSDM.
Abstract: Flooding is a mechanism that distributes packets to every node exist in the network. The flooding mechanism is most frequently used in many application areas of wireless multi-hop networks. As flooding exploits hop-by-hop broadcasting which suffers from unreliable transmission of information and fading, it is hard to achieve the reliability in flooding. As unreliable flooding may cause to a coverage hole, which may affect the upper layer protocols. In this paper, we introduce a Reliable Routing Algorithm (RRA), which estimates the expected reliability using two-hop topology knowledge. The estimated reliability is the deciding factor to retransmit a packet. Using NS-2 simulator, we show that RRA achieves the higher reliability than RBP by adjusting the number of retransmissions considering the network topology, regardless of the network topologies, the node density or the number of bottlenecks.
Keywords—RRA, ACK, RBP.
Abstract: The distribution of water on earth surface within the natural land surfaces mainly depends upon the geography of the earth surface. The assessment of these processes like surface runoff, stream flow etc. mainly depends upon the geography of the earth surface. Digital Elevation Model (DEM) is a file containing latitude, longitude and elevation of earth surface. Many topographic features can be computed directly from (DEM). Assessment of topography manually is generally tedious, time consuming and often subject to error. In the present paper author has demonstrated the methodology of creating the DEM using two data set contour lines and elevation data using Survey of India topographic sheets in the scale 1:50,000.
Keywords— Contour, Elevation, Digital Elevation Model, Geogrpahical Information System, Topography.
Abstract: In this review paper we have done our analysis on various researches on MIMO STBC system in order to achieve the better system performance. This is well known that the performance of the wireless communication systems can be improved by using multiple transmit and receive antennas (MIMO), which is generally referred to as the MIMO technique, and has been incorporated. The space-time coding (STBC) is a promising way to realize the gain in the wireless communications system using MIMO. To increase the code rate and the throughput of the orthogonal space time block code for more than two transmit antennas is analyzed. Numerous researchers have investigated many benefits as well as a substantial amount of performance gain of receive diversity can be reproduced by using multiple antennas at transmitter to achieve transmit diversity. The development of transmit diversity techniques has started for the future enhancement of this rapid fashion research field. It can be expected multiple-input multiple-output technology to be a keystone of various wireless communication systems due to the possible increase in data rate and performance of wireless links offered by transmit diversity and MIMO technology.
Keywords— Wireless Communication, Multiple Input Multiple Output (MIMO) and Space Time Block Coding (STBC).
Abstract: This present stage of day to day affairs, the protection of data and legalisation is very important. Data authentication in image are achieved by watermarking .Watermarking is a technique for embedding hidden data that attaches copyright protection information to digital information. This provides an indication of ownership of the digital data. The proposed scheme employs a spatial domain visible colour image watermarking for improve the security and authentication. Pixel Mapping Method (PMM) is used in this proposed work. In this scheme using two parameters for scaling and embedding of an images. The quality of the watermarked images is analysed by comparing some parameters with original image. The proposed approach results in high value of PSNR between host image and watermarked image.
Keywords— Spatial domain watermarking, Visible image watermarking, Pixel mapping method, Peak signal to noise ratio.
Abstract: This work deals with new family of high boost voltage inverters that improve upon the conventional Trans-Z-source inverter and Trans-quasi-Z-source inverter. The efficiency of inverter circuit decreases due to the presence of discontinuous DC input current, ripple content and high inrush current during starting. These drawbacks are filtered out using improved Trans-Z-source inverter were it provides continuous input current, suppress resonant current at starting and higher boost voltage inversion capability. The aim of this work is to present the analysis, operating principle, simulation results of improved trans-Z-source inverter.
Keywords— Trans-Z-source inverter,shoot through state.
Abstract: In the FSS algorithm a technique will develop to determine and summarize the customer comment with the help of opinion mining and the natural language processing. Comments made by the customers some times are not able to understand by the computer so easily , so the intelligent technique help to overcome this problem that any web based business will become so easy and transparent to both customers and merchants. In the proposed work with the help of several steps like feature identification, sentiment analysis, and Summarization the orientation of each comment can be checked and user can know whether the comment is in favor or in against of the product.
Keywords- Opinion mining, natural language processing, feature identification, orientation