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    Volume-8 Issue-3


    Title: Design of Double-Layer Microstrip Patch Antenna using Fractal Geometry for Multiband Applications

    Authors: Mayuri Panat and Dr. Swapnil Jain

    Abstract: In the proposed research work, double layer microstrip antenna structure using square shaped fractal geometry has been presented. Working frequency of antenna ranges between 1 to 6GHz which is suitable for multiband applications. Excitation provided through inset feeding present at layer of dual layer antenna as upper layer is electromagnetically coupled with that of bottom one. Easily available substrate FR4 is chosen as a dielectric surface in order to design antenna. Conventional rectangular microstrip antenna with a slot is compared with double layer structure and the design is simulated in validated tool computer simulation tool (CST).

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    Title: Novel High Speed And Low- Power Full Adders Based On Full-Swing XOR-XNOR

    Authors: D. Anuradha, S. Haroon Rasheed and K. Bhaskar Rao

    Abstract: This paper describes the operation of new proposed circuits for XOR or XNOR and simultaneous XOR and XNOR circuits. By using these proposed circuits we can achieve high optimization in terms of power consumption and delay. This optimization is due to low output capacitance and low short circuit power dissipation. By using these proposed XOR/XNOR and XOR-XNOR circuits we also proposed a six hybrid Full Adder circuits each performs a 1-bit addition operation. These Full Adder circuits are designed based on Full-Swing operation. Each full adder circuit gives its best performance in any one of the parameters that is power, delay, driving capability and so on. Thus we can reduce the power consumption, delay and power delay product (PDP).

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    Title: Improved Energy Efficiency of Massive MIMO ? OFDM System

    Authors: Dr.S.Marypraveena, R.Kanmani and R.Ramya

    Abstract: To investigate the feasibility of improving the energy efficiency (EE) of massive multiple input multiple-output (MIMO) - Orthogonal Frequency Division Multiplexing (OFDM) systems by considering the peak-to-average power ratio (PAPR) reduction of the OFDM signal and downlink transmitter (TX) power control. OFDM is becoming the most popular technique and it uses orthogonal signal to remove inter-signal interference. More PAPR ratio means that more power needs to be transmitted from transmitter side. In this paper, partial transmit sequence (PTS) technique is used to improve the peak-to-average power ratio (PAPR) statistics in OFDM system. These techniques are well-known as effective Energy Efficiency (EE) improvement methods, Numerical results show that the theoretical analysis is in good agreement with the simulation results, and thus can be used as useful tool to improve EE. A simulation result shows that the OFDM relay system with PTS scheme would achieve higher Energy Efficiency (EE) than the system without PAPR reduction.

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