ISSN(Print):2320–3765 ISSN (Online): 2278–8875 International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering Vol. 2, Issue 6, June 2013 Copyright to IJAREEIE www.ijareeie.com 2169 COMPARISON OF ENERGY CONSUMPTION IN MOBILE AD-HOC NETWORK BY INCREASING THE SPEED OF THE NETWORK USING OFDM Himanshu Prakash Rajput 1 , Rajan Mishra 2 Research Scholar, MMM Engineering College, Gorakhpur, India 1 Assistant Professor, MMM Engineering College, Gorakhpur, India 2 ABSTRACT: This paper shows the comparison of energy of Mobile ad-hoc network by increasing the mobile speed of the entire network. The technology used in this paper is OFDM and the results is shown using Qualnet. KEYWORD: - QUALNET, OFDM, MANET, QPSK, DPSK I. INTROUCTION Communication is one of the important aspects of life. The purpose of communication is to transport an information bearing signal from a source to a user destination through a communication channel. A communication system may be in analog as well as in digital form. In analog form continuous signals are being used that vary continuously with time where as in digital system discrete electrical signals are used for transmission. II. ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) OFDM is a modulation technique used for many wireless communication applications including Mobile Communication. OFDM is similar to frequency division multiplexing with a difference that in OFDM all the sub-bands are used by one source at a given time. In OFDM the band is divided into 52 sub-bands with 48 sub-bands for sending data and 4 sub-bands for the control information. The interference is reduced due to this division in sub-bands. DPSK (Differential Phase Shift Keying) and QPSK (Quadrature Phase Shift Keying) is used in OFDM systems to avoid need to track the time varying channel. It provides much more security to the data. It is robust to channel pair impairment and provides large data rates. Parallel Transmission is used in OFDM while the data is transmitted. The two basis limitations of OFDM include High PAPR (Peak to Average Ratio) and the large dynamic range of signals. The OFDM Mainly works at Physical and MAC layer only. OFDM provides transmission of many signals simultaneously through a single channel where each signal has its own separate frequency. It is used in systems such as Wi-Fi(802.11a/g/n), Wi-Max(802.16), DSL (Digital Subscriber Line) and DVB-T (Digital Video Broadcasting-Terrestrial). It handles the multi-path interference which generates frequency selective fading and Inters symbol Interference (ISI). It is a modulation scheme that can convert a single wideband signal into series of independent narrow band signals placed side-by side in frequency domain. Its main benefit is that the sub carriers in OFDM can overlap each other. With the advancement of DSP Technologies, It delivers up to 54 Mbps in 5 GHz ISM band. The applications of OFDM have been scarce. III. RESULTS AND ANALYSIS Here initially we have considered a network with 4 mobile nodes placed in rectangular grid as shown in fig 1. The protocol distance is taken as 1 hop. The OFDM works in 5 GHz ISM band hence the channel frequency is taken as 5.2 GHz with a bandwidth of 20 MHz, the minimum data rate is set as 6Mbps. The Antenna Height is 1.5m. The maximum mobile speed is taken as 1.3m/s. The model is taken as two ray path loss model with shadow fading of 12dB for making it suitable for indoor environment. The two ray path loss model is a model that is valid for line of sight and it consist of one direct ray and other reflected ray. It is a type of deterministic path loss model. The path loss is defined as the difference between transmitted and received power. OFDM has symbol duration of 4μs.Each OFDM can support 24 un-coded bits. The effect of fading is neglected.