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    Volume-7 Issue-5

    Title: Effects of Poisson node distribution and dynamic routing in Improvement of Lifetime of WSNs

    Authors: Rajiv Ranjan Tewari and Snehi Saraswati

    Abstract: Energy hole is a major problem found in wireless sensor networks, which implies that the nodes which are close to the sink region can die sooner as a result of these; nodes send their own data to sink further as forward data for alternative nodes. Due to effect of energy hole, despite the fact that energy continues to be remained in outer region nodes data would not be transferred to sink that affect the lifetime of the networks. In this paper, we proposed the jointly effect of poisson distribution of nodes towards the sink and Dynamic Routing to improve the lifetime of the WSNs. Effectiveness of our proposed technique is shown by simulation experiments.

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    Title: Virtual TelePresence Robot Feature with Virtual Assistance

    Authors: Hemant Kumar Varshney and Alaa Desher Farhood

    Abstract: A telepresence robot is a remote-controlled, wheeled device with a display to enable video streaming which enable the participants to view remote locations, as if they were there. It consists of a VR headset, with a smart phone in dual screen to experience virtual reality and four wheeled robotic vehicle. The movement of the Robot is controlled using a smart phone remote controller. The motion of the camera of the robot is controlled by the accelerometer, gyroscope, magnetometer and the data is processed by Arduino UNO and Raspberry Pi. Video streaming is received by the smart phone using the IP address specified by the Raspberry Pi.

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    Title: Fault Tolerance Design Techniques for Parallel Matrix Vector Multiplications

    Authors: M. Deepikakrishna and K. Rama Devi

    Abstract: Matrix vector multiplication is the process of multiplying a matrix with a vector. Multiplying matrices in parallel with a common input vector is Parallel Matrix Processing, and is most often performed in Modern digital signal Processing and Digital Communication Systems. In this paper Fault Tolerant Design techniques are proposed for Parallel Matrix Vector Multiplications. The Techniques combine ideas from error correction codes with the self checking capability of Matrix Vector Multiplication. Hamming code is used for single error correction and Bose Chaudhari Hocquenghem code (BCH) is used for Double error correction. Synthesis results show that the proposed techniques significantly reduce the overheads. Hence the proposed technique reduces the cost of providing fault Tolerance. The proposed design is synthesized in Xilinx 14.5.

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    Title: A Review on Radio over Fibre Optic Communication

    Authors: Parvesh Kumar and Kulwinder Kaur

    Abstract: Recently there has been observed a huge requirement of Bandwidth in wireless and wired communication with the advent of bandwidth demanding applications like video based interactive and multimedia services. Congestion and limited frequency spectrum have haltered the speed of communication systems to Megabits-per-second (Mbps) only. To achieve high data rates, the viable solution is bandwidth and the most assured path to Gbsps is the utilization of radio signals which occupies wideband. Fiber optic is the perfect intermediate for mm-wave communication owing to less cost as well as wide bandwidth. The resultant technology is known as the ROF technology. Radio over Fibre in mm-wave band is the promising technology to meet challenges of next generation communication systems. Bandwidth hungry services cause the traffic in the microwave band. To eliminate the congestion in this band researchers are focused to develop the solution. Frequency region of mm-wave frequency spectrum is the ultimate solution for the future very high-speed communication systems. The use of these waves offers the architecture of cheap wireless and small size transmission that is able to provide the suitable terminal mobility.

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    Title: Design of Approximate Radix-8 Booth Multiplier Using Carry Save Adder

    Authors: P. Anitha and K. Rama Devi

    Abstract: Multipliers are widely used in arithmetic units of microprocessors, multimedia and digital signal processor. Approximate computing is an attractive design methodology to achieve low power, high performance (low delay) and reduced circuit complexity by relaxing the requirement of accuracy. In this paper, approximate booth multipliers are designed based on radix_8 modified booth encoding (MBE) algorithms and regular partial product array that employs an approximate Wallace tree. Two approximate booth encoders are proposed and analyzed for error tolerant computing. The error characteristics are analyzed with respect to the so-called approximation factor that is related to the inexact bit width of the booth multipliers. Final accumulation is done using carry look ahead adder in the existing method which employs more speed and occupies more area. To reduce area, at the cost of speed carry save adder is used for final product accumulation in the proposed method. The design is simulated using Xilinx 14.5 and power and delay parameters are analyzed.

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    Title: Aperture Coupled Fractal Antenna for Wi-Max and WLAN Applications

    Authors: Dr.P.Jothilakshmi, J.Bharanitharan and N.Varnikha

    Abstract: In current wireless communication systems low profile, wider bandwidth and multiband and antennas are in great need for commercial as well as military applications. This has led to antenna research in several directions, one of the method to get multi band antenna is using fractal antenna elements. Proposed antenna operates in the frequencies 3.548GHz and 5.833GHz which can be used for both WiMAX and WLAN applications. Aperture coupled feeding technique is used. We have used CST software for simulating the antenna. Fractals are space filling contours that means electrically larger dimensions are compactly packed into small areas. As the electrical lengths are an important part of antenna design, this can be used as a feasible miniaturization technique. The proposed fractal antenna with two iterations have achieved a size reduction of 44.5%.

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    Title: Congestion Avoidance Protocols for Wireless Sensor Networks: A Survey

    Authors: Nishant

    Abstract: The fundamental issue in a wireless sensor network is congestion because of which the exhibitions of the network, for example, organize throughput and packet loss is influenced. To diminish the congestion from the WSN a near report has been done among AODV and KAODV utilizing karnaugh map. In this paper, we study the congestion avoidance protocols are AODV protocol and KAODV protocol.

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    Title: Comparative analysis of different PAPR reduction techniques in OFDM systems

    Authors: Vandana Pundir and Prof. Anwar Ahmad

    Abstract: Peak to average power ratio (PAPR) is a major drawback of Orthogonal frequency division multiplexing (OFDM) and Multiple-input multiple-output (MIMO) OFDM systems. A high PAPR OFDM signal causes distortion in non-linear devices. These non-linear devices can be High power amplifier (HPA), Analog to digital convertor (ADC) etc. In order to reduce the PAPR, a number of PAPR reduction schemes are identified and presented in literature. Some of them are Selective Mapping (SLM), Partial Transmit Sequence (PTS), Clipping, Tone Reservation and Tone injection, Coding schemes etc. In this paper, we have discussed about Clipping, PTS and SLM technique and their effects on OFDM signal. The SLM technique is modified by using PTS phase rotation vectors and Clipping technique. The performance of this modified SLM technique is compared with original OFDM, PTS and SLM. The simulation results are also presented for better understanding of our findings. Further, the PAPR and BER analysis of QPSK input over Rayleigh fading channel for Orthogonal STBC 4 x 1 MIMO is also presented.

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