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Modeling and Analysis of the Crankshaft Using Ansys Software REFERENCES: [1.] Rincle Garg, Sunil Baghla, “Finite element analysis and optimization of crankshaft”, International Journal of Engineering and Management Reaserch, vol-2,Issue-6,ISSN: 2250-0758, Pages:26-31, December 2012. [2.] C.M Balamurugan, R. Krishnaraj, Dr.M.sakhivel, K.kanthavel, Deepan Marudachalam M.G, R.Palani, “Computer Aided modelling and optimization of Crankshaft”, International Journal of scientific and Engineering Reaserach, Vol-2, issue-8, ISSN:2229-5518, August-2011. [3.] Gu Yingkui, Zhou Zhibo, “Strength Analysis of Diesel Engine Crankshaft Based on PRO/E and ANSYS”, Third International Conference on Measuring Technology and Mechatronics Automation, 2011. [4.] Abhishek choubey, Jamin Brahmbhatt, “Design and Analysis of Crankshaft for single cylinder 4-stroke engine”, International Journal of Advanced Engineering Reaserch and studies, vol-1, issue-4, ISSN:2249-8974, pages: 88-90, July-sept 2012. [5.] R.J Deshbhratar, Y.R Suple, “ Analysis and optimization of Crankshaft using FEM”, International Journal of Modern Engineering Reasearch, vol-2, issue-5, ISSN:2249-6645, pages:3086-3088, Sept-Oct 2012. [6.] Farzin H. Montazersadgh and Ali Fatemi “ Stress Analysis and Optimization of Crankshafts Subjected to Dynamic Loading”, AISI, August 2007. www.<strong>ijcer</strong>online.com ||May ||2013|| Page 89
International Journal of Computational Engineering Research||Vol, 03||Issue, 5|| Efficient Model for OFDM based IEEE 802.11 Receiver with Autocorrelation technique And CORDIC algorithm Mathana.J.M 1 , Anusha.S.L 2 , Jamal Hajara Parveen.J.M.H 3 , Vaishnavi.J.P 3 1 Associate Professor, Department of ECE, RMK college of Engineering and Technology, India. 2, 3, 4 Department of ECE, RMK college of Engineering and Technology, Tamilnadu, India ABSTRACT: To achieve compact spectral utilization with utmost efficiency in OFDM based WLAN receiver, Autocorrelator and CORDIC algorithm is used. This paper deals with simulation of these algorithms using Verilog HDL. An Autocorrelator takes care of frame synchronization, time synchronization, frequency synchronization by autocorrelating the received signal. CORDIC is an iterative trigonometric algorithm that performs vector rotations with one additional bit of accuracy for each iteration. It is used to estimate frequency offset by calculating the phase of the maximum correlating signal. Keywords - Autocorrelator, CORDIC, frequency offset, Iteration, Synchronization. I. INTRODUCTION During recent years the need for mobile broadband communications has increased rapidly placing new demands for the wireless local area networks (WLANs). To answer these needs, the European Telecommunications Standards Institute (ETSI) is working on HIPERLAN (HIgh PERformance LAN) standards. The HIPERLAN/2 architecture is easily adapted and integrated with a variety of fixed networks. It has a very high transmission rate up to 54 Mbit/s in 5GHz band. This is achieved by making use of a modularization method called Orthogonal Frequency Digital Multiplexing (OFDM) [1]. The basic idea of OFDM is to transmit broadband, high data rate information by dividing the data into several interleaved, parallel bit streams, and let each bit stream modulate a separate subcarrier [1]. The property of orthogonality allows simultaneous transmission on a lot of sub-carriers in a tight frequency space without interference from each other. This acts as an advantage in OFDM [3][4][5].Therefore, OFDM is becoming the chosen modulation technique for wireless communication. OFDM is particularly efficient in time-dispersive environments. With the help of OFDM, sufficient robustness can be achieved to provide large data rates to radio channel impairments. OFDM requires extensive use of Autocorrelator and CORDIC. In this paper we will give the implementation details needed by the Hiperlan 2 standard, but most of the work can be generalized to the IEEE standards since physical layer in both three standards are similar (a common synchronization solution is found in [2]). The paper is organized as follows. In section II we describe the WLAN Receiver structure and its modulation technique is discussed. In section III and IV we discuss about Autocorrelator and CORDIC blocks respectively. The simulation results of these blocks are discussed in section V. Finally conclusions are drawn in section VI. II. WLAN RECEIVER MODEL 2.1. Modulation Scheme A combination of modulation and multiplexing constitutes the orthogonal frequency division multiplexing, in other words OFDM. Modulation is the process of transforming the carrier into waveforms suitable for transmission across channel, according to parameters of modulated signal [6]. A key feature of the physical layer is to provide several physical layer modes with different coding and modulation schemes, which are selected by link adaptation. BPSK, QPSK and QAM are the supported subcarrier modulation schemes. The most useful type of modulation for OFDM (orthogonal frequency division multiplexing) is Quadrature amplitude modulation (QAM). QAM changes phase and amplitude of the carrier, and it is a combination of amplitude shift keying (ASK) and phase shift keying (PSK). www.<strong>ijcer</strong>online.com ||May ||2013|| Page 90
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