Performance Comparison of Single and Multipath Routing Protocols in Adhoc Networks Er. Deepinder Singh Wadhwa*, Er. Tripatjot Singh Panag** Assistant Professor*, Assistant Professor** Department of Electronics and Communication Engg., BGIET, Sangrur* Department of Electronics and Communication Engg., BBSBEC, Fatehgarh Sahib** ABSTRACT In a Mobile adhoc network (MANET), Mobile nodes communicate with each other using multihop wireless links. There is no stationery infrastructure, for instance there is no base station. Each node in the network also acts as a router, forwarding data packets for other nodes [2] an adhoc network can be formed by mobile computers with wireless interfaces that communicate among themselves without any help of infrastructure. The network without infrastructure is known as adhoc network is formed by mobile stations inside a restricted area which communicate without the need of access point [3]. In an adhoc network the mobile nodes agree to serve as both routers and hosts. Now a day’s wireless networks started as choice of effective networking because of the successive developments in the wireless product technologies continue decline in prices and great freedom available to users to move without affecting their business [4]. Performance comparison of AOMDV, AODV and DSDV with ns-2 (version 2.34) simulations shows that AOMDV is able to achieve remarkable packet delivery fraction and almost similar throughput. 1. Introduction Now a day’s wireless networks started as a choice of effective networking because of the successive developments in the wireless product technologies due to continue decline in prices and a great freedom available for users to move without affecting the business [4]. In an adhoc network, mobile nodes communicate with each other using multihop wireless links. There is no stationary infrastructure; for instance, there are no base stations. Each node in the network also acts as a router, forwarding data packets for other nodes. A central challenge in the design of ad hoc networks is the development of Dynamic routing protocols that can efficiently find routes between communicating nodes. The routing Protocol must be able to keep up with the high degree of node mobility that often changes the network topology drastically and unpredictably. Such networks have been studied in the past in relation to the defense research, often under the name of packet radio networks [2]. An adhoc network is formed by mobile computers (nodes) with wireless interfaces that communicate among themselves without the help of any infrastructure. The network without infrastructure also known as adhoc network is formed by mobile stations (nodes) inside of restricted area which communicate without the need of access point [3]. In an adhoc network, mobile nodes agree to serve both routers and hosts. These nodes can dynamically leave and join the network, frequently without warning and possibly disrupting communication among other nodes [38]. Much wireless technology is based upon the principle of direct point to point communication. In most popular communication models such as wireless local area network (WLAN) and group standard for mobile communications (GSM), mobile nodes use an approach where communicate takes place to each other via some centralized access points. Therefore, centralization and infrastructure are a part of characteristics of such networks where necessarily needed for their configuration and operation [1]. Also, there is a existence of another approach where mobile nodes utilizing each other as access points or relays for traffic when they cannot establish a direct communication with end points. That model of communication is called mobile adhoc networks (MANETS). These networks can be set up randomly and when needed (on demand). In MANETS nodes have to announce their presence periodically and listen for their neighbors announcements broadcasts to discover and learn how to reach each other. Therefore, mobility and scalability are the main challenges in the infrastructure less networks. Deepinder Singh Wadhwa et al, Int. J. Comp. Tech. Appl., Vol 2 (5), 1486-1496 IJCTA | SEPT-OCT 2011 Available online@www.ijcta.com 1486 ISSN:2229-6093