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In most existing wireless networks, end users obtain data content from the wired network, typically, the Internet. In this manner, virtually all of their traffic must go through a few access points, which implies that the capacity of wireless network is limited by the aggregated transmission data rate of these access points. To fully exploit the capability of wireless network, we envision that future...
In Mobile Ad-hoc Networks (MANETs) the absence of any fixed infrastructure and mobility brings attractiveness for its usage in time-critical applications and collaborative computing. In this paper, we investigate the performance of our MANET testbed in mixed environment considering horizontal and vertical topologies. We analyze the behavior of Optimized Link State Routing (OLSR) protocol and consider...
Network Coding has been proven to be a method that will increase the throughput of network. Network coding will perform an XOR operation in the intermediate nodes to improve the throughput of the network. The simulation of network coding in AODV to search for the route to destination will be conducted in MATLAB. This paper introduces the development of simulation to illustrate the performance of network...
Among Many fundamental communication primitives in mobile ad hoc networks, 1-hop broadcast plays an important role in which a message from the source node is delivered to all nodes within the source node's transmission range. Despite the importance of it, 1-hop broadcast is not easy to accomplish due to collisions in wireless networks known as Hidden Terminal problem. This paper presents a MAC protocol...
Ad hoc On-demand Distance Vector (AODV) is a routing schema for delivering messages in a connected Mobile Ad hoc Network (MANET). Connectivity between any sources to destination pair in the network exists when they are in radio range of each other. Local Repair is an important issue in routing protocol which is needed for minimizing flooding and performance improvement. Routes can be locally repaired...
The performance of wireless ad hoc networks is mostly be limited by the traffic congestion. To alleviate such a problem, Cognitive Radio (CR) technology can be used. The contribution of this paper is to investigate a CR-based Medium Access Control (MAC) layer for wireless ad hoc networks. We aim to focus on a Cognitive MAC protocols for a no licensed user which can be enabled to access the large amount...
The Mobile Ad hoc Networks (MANETs) are normally deployed in the disaster affected areas where there is a big damage to infrastructural resources or in the military operations in the remote areas, where the infrastructural resources are virtually nonexistent. The performance of these networks is known to be dependent upon various parameters such as transmission range, mobility, bandwidth and residual...
A Mobile Ad hoc Network (MANETs) is a group of wireless mobile terminals, which cooperate together by routing packets to each other on a temporary network. MANETs are attracting attention for their potential use in several fields such as collaborative computing and communications in indoor and outdoor environments. Considering mobility of the terminals, routing is a key process for operation of MANETs...
The applications for Mobile Ad-hoc Networks (MANETs) are increasing and many research is done in this field. Real world experiments are an important way to test the behavior and performance of MANETs. We implemented a MANET test bed, to test these networks. In this paper, we compare the experimental results of our indoor MANET test bed for different environments, in a horizontal plane and a vertical...
A significant portion of communication across tactical edge networks includes multicast traffic to support collaboration among many separate multicast groups. In order to provide a reliable and scalable network, it is critical to optimize its multicast performance. However, multicast traffic performance in radio networks is limited by the data link layer design for distribution of multicast traffic...
Mobile Ad Hoc Network (MANET) is a dynamic network without fixed infrastructure due to their wireless nature and can be deployed as multi-hop packet networks. It is a wireless network and has dynamic topology due to its node mobility. Networks are being used in various areas and the demand of users nowadays has motivated the emergence of the heterogeneous MANET. Compared to homogeneous MANET, heterogeneous...
In this paper, we propose a general framework to evaluate and compare both throughput and energy efficiency of mobile ad hoc networks. This framework is built upon a probabilistic, energy-aware, calculus for the analysis of broadcast, unicast and multicast wireless communications. The results of our analyses can be used to replace a network component with a more efficient one — with respect to different...
TCP is a transport layer protocol providing end-to-end reliable data transfer over IP based network. Wired TCP versions have been developed many years and have good performance. When they are deployed in wireless environment, they show poor performance. In this paper we present our evaluation on TCP performance in the term of throughput unfairness in an IEEE802.11-based ad hoc network. We evaluate...
Traffic in future Mobile Ad-Hoc Network (MANET) is expected to carry a mix of real time multimedia, and non real time file transfer etc. Providing Quality of Service (QoS) for these different applications is difficult and the current research on MANET is choosing the Cross Layer Design for providing QoS. The packet loss due to collision is misinterpreted by MANET as route failure and this triggers...
This paper proposes a cross-layer adaptive cooperative MAC protocol (CAC-MAC) based on IEEE 802.11 DCF, which forms a complete Application-MAC-PHY layer framework. The main feature of CAC-MAC protocol is an adaptive selection of data transmission scheme according to packet length and instantaneous wireless channel conditions. Simulation results show that the novel protocol significantly improves the...
Networks are being used in various areas and the demand of users nowadays has motivated the emergence of the Mobile Ad Hoc Network (MANET). MANET is a dynamic network without fixed infrastructure due to their wireless nature and can be deployed as multi-hop packet networks. It is a wireless network and has dynamic topology due to its node mobility. There are two types of MANET, homogeneous and heterogeneous...
In this paper we are investigating the capacity of Mobile Ad Hoc Networks under a concurrent transmission constraint imposed by common MAC layer protocols (such as 802.11). This problem is known to be an NP-hard combinatorial problem and a greedy algorithm has been proposed for solving it in polynomial time. We propose an efficient algorithm for solving the exact problem and compare the exact and...
TCP Vegas congestion algorithm was designed for wired networks, but has poor performance when used in mobile ad hoc network. This paper analyses the impact of hops changing in mobile ad hoc network on the performance of TCP Vegas, and presents a new algorithm named TCP Vegas-HA (TCP Vegas — Hops Adaptive) to improve the performance of TCP Vegas in mobile ad hoc network. As the minimum round-trip time...
Mobile Ad-hoc networks(MANET)s are self organizing networks which can form a communication network without any fixed infrastructure. The constant bit rate (CBR) traffic is very well known traffic model for mobile Ad-hoc network. CBR traffic generates data packets at a constant rate. This constant rate packet generational is good enough for text data packets. The multimedia applications generally generate...
This paper describes and investigates the performance enhancement techniques used in IEEE 802.11g MANET in AODV and DSDV routing environment. Through variation of Short Interframe Space (SIFS) values, a better scheme to enhance the wireless network performance can be achieved. This is important especially to assign high priority network nodes that carry time sensitive data to reach the intended receiver...
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