IJEECM Journal of Electronics & Communication (IJEECM-JEC)

Design And Implementation Of QPSK Modulation System

Authors: S.Yogitha, D.P.Raju

Abstract: Quadrature Phase Shift Keying (QPSK) is one of the most popular digital modulations. The QPSK modulator consumes less power and bandwidth in a modern devices but for a system like satellite and mobile devices where their operations are power limited, this is a problem that needs to be fixed. The objective is to design the QPSK modulator that uses less power for operation and it should be bandwidth efficient. Although, this process may seem to be insignificant at initial stage, but this modulation scheme enables the carrier to transmit the 2-bits of information instead of 1-bit. This doubling makes the bandwidth of the carrier, more effective. The proposed modulator successfully modeled with Verilog Hardware Description Language (HDL), simulated with Xilinx Integrated Software Environment (ISE) version 14.5 software. QPSK modulation is also performed on MATLAB tool

Keywords: Verilog, QPSK, PHASE, MATLAB, Communication

Delay Efficient ACT Module Implementation Using VLSI Arithmetic Circuit

Authors: Pidugu Gopi, SVNK Pavan Kumar

Abstract: The discrete cosine transform (DCT) is a widely-used and important signal processing tool employed in a plethora of applications. Typical fast algorithms for nearly-exact computation of DCT require floating point arithmetic, are multiplier intensive, and accumulate round-off errors. Recently proposed fast algorithm arithmetic cosine transform (ACT) calculates the DCT exactly using only additions and integer constant multiplications, with very low area complexity, for null mean input sequences. The ACT can also be computed non-exactly for any input sequence, with low area complexity and low power consumption, utilizing the novel architecture described. However, as a trade-off, the ACT algorithm requires 10 non-uniformly sampled data points to calculate the eight-point DCT. This requirement can easily be satisfied for applications dealing with spatial signals such as image sensors and biomedical sensor arrays, by placing sensor elements in a non-uniform grid. In this work, a hardware architecture for the computation of the null mean ACT is proposed, followed by a novel architecture that extend the ACT for non-null mean signals. All circuits are implemented and tested and synthesized using the Xilinx ISE14.7.

Keywords: DCT, ACT, EIGHT-POINT DCT, AFT

CLOUD based Home Automation using RASPBERRY PI

Authors: B.Annie keziah, K.Kiran murthy

Abstract: IOT or Internet Of Things is an upcoming technology that allows us to control hardware devices through the internet. Every one seems to automate most of the possible things to take advantage in providing ease in life, secure and saving electricity. In this we propose to use IOT in order to control home appliances, thus automating modern homes through the internet. This system uses three loads to demonstrate as house lights. Our user friendly interface allows a user to easily control these home appliances through the internet. For this system we use a Raspberry Pi. This Pi is having inbuilt wifi modem to access internet By using that wifi module we get user commands over the internet. Algorithm is developed in python language, which is default programming language provided by Raspberry Pi. Pi processes these instructions to operate these loads accordingly. PIR, Gas sensor are used detect the person and the leakage of gas in the home. The detected information will be updates in the internet by using wifi module. Thus this system allows for efficient home automation over the internet.

Keywords: Home automation, Python, Raspberry Pi, WI-FI dongle, PIR.

An Efficient Design and Implementation of MZI Based All Optical Reversible Carry Look Ahead Adder

Authors: T.Swarna Latha, Koyya Ramesh

Abstract: Carry look ahead adder (CLA) is the fastest of all adders and achieve speed through parallel carry computations. This method does not require the carry signal to propagate stage by stage. In this project, an efficient reversible implementation of Carry-Look ahead Adder (CLA) in all-optical domain is presented. Now-adays, semiconductor optical amplifier (SOA)- based Mach–Zehnder interferometer (MZI) plays a vital role in the field of ultra-fast all-optical signal processing. We have used all optical based Mach-Zehnder Interferometer (MZI) switches to design the CLA circuit implementing reversible functionality. The design of reversible circuit with optical technology can be implemented using Semiconductor Optical Amplifier (SOA) based Mach-Zehnder Interferometer (MZI) switch, which has significant advantages of high speed, low power, fast switching time and ease of fabrication. A conventional carry select adder is still power consuming due to the dual ripple carry adder structures having cin as ‘0’ and ‘1’. An efficient method which replaces the ZCLA instead of RCA with cin=’0’in the conventional CSLA is efficient and this CLA with the Mach zehnder interferometer technique can be more helpful and advantageous for the digital optical fibre communications.

Keywords: Home automation, Python, Raspberry Pi, WI-FI dongle, PIR

Iris and Fingerprint based security control system

Authors: Thota Ramarao, Y Veera raju

Abstract:

Authentication is a fundamental issue to any trustoriented computing system and also a critical part in many security protocols. In addition, uthentication also serves as the first step for many other security purposes, such as key management and secure group communication [5]. Passwords or smartcards have been the most widely used authentication methods due to easy implementation and replacement; however, memorizing a password or carrying a smartcard, or managing multiple passwords/smartcards for different systems (one for each system),is a significant overhead to users. In addition, they are artificially associated with users and cannot truly identify individuals Performing authentication is notoriously difficult. Biometrics has been widely used and adopted as a promising authentication [8] method due to its advantages over some existing methods, particularly, its resistance to losses incurred by theft of passwords and smart cards.....................

Keywords: ARM7 (LPC2148), RFID, Fingerprint module, pc cam, keypad, buzzer, DC motor

SYNTHESIS AND IMPLEMENTATION OF UART USING VHDL CODES

Authors: YARLAGADDA SIRISHA, S. KOTESHWARAO

Abstract:

The proposed paper describes the universal asynchronous receiver/transmitter i.e. UART which is the kind of serial communication protocol which allows the full duplex communication in serial link. This paper presents the hardware implementation of a high speed and efficient UART using FPGA. The UART consists of three main components namely transmitter, receiver and baud rate generator which is nothing but the frequency divider. This has been simulated on ModelSim SE 10.0a and has been implemented by using Verilog description language which has been synthesized on FPGA kits such as Virtex4 and Spartan3.

Keywords: UART, maximum frequency, number of slices.

Robot based Gas Detecting in Coal Mines

Authors: Sk. Basha, Koduri Jhonson

Abstract:

As one of the largest coal production and consumption countries in the world, China is also one of the related accidents occurred frequently countries such as gas explosion, flood, breaking out of fire during the exploitation of coal mine. Coal Mine Detection Robot can be substituted or partial substituted for emergency workers to enter the mine shaft disaster site and detect hazardous gas and do some environmental exploration and surveying task. Coal Mine Detection Robot uses infra-red spectrum absorption way to detect methane, carbon monoxide and such gas simultaneously. The principle of gas surveymeter of infra-red spectrum is according to the selectively absorption of infrared radiation by the mash gas................

Keywords: Coal Mine Detection Robot; Methane; CO; Infrared Spectrum Absorption
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