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The operation of Ad-hoc networks depends on the cooperation among nodes to provide connectivity and communication routes. However, such an ideal situation may not always be achievable in practice. Some nodes may behave maliciously, resulting in degradation of the performance of the network or even disruption of its operation altogether. To mitigate the effect of such nodes and to achieve higher levels...
Due to the limited energy-source and mostly unattended nature of the wireless sensor networks, efficient use of energy has a critical importance on the lifetime of the applications accomplished by such networks. Although in most of the cases sensor nodes are battery-powered, there are application scenarios in which battery- and mains-powered nodes coexist. In this paper, we present an approach and...
In this paper focusing on multihop decode and forward ad hoc network, a distributed power optimized cooperative algorithm based on greedy geographical routing (POCGR) is proposed. We are concerned about optimizing the transmit power and reducing the total number of hops in a multihop wireless relay network jointly. We propose POCGR routing algorithm which minimizes the total power consumption while...
Clearly, making use of user cooperation transmission technique in a multi-hop wireless network improves its performance in terms of transmission reliability and gives birth to multi-hop wireless relay networks. In this paper, we investigate and evaluate the Bit Error Rate (BER) of multi-hop wireless relay networks employing distributed Space-Time Block Coding (STBC) at many relays' levels. One relays'...
In a wireless ad hoc network, relays are used for passing the data from a source to a sink when the source is too far to reach the sink due to their transmission-range limitation. To evaluate the reliability of data transmission from source s to sink t, this paper proposes a mathematical analysis to calculate the probability of s-t connectedness when there can be failed relays. By using the technique...
Emergency message propagated in vehicular networks is delay intolerance and crucial for safety management. While the non-real-time traffic can highly improves the quality and comfortable of everyday. However, due to the limited transmission coverage and the poor quality of time-varying wireless environment, the two type traffic need relay to assist in the completion of communication. So this paper...
Huge interest and demand on information superhighway have pressed various telecommunications research fronts and lead to a new form of future Internet consisting of wired and wireless segments where resource-constrained devices such as palm pilots and sensors may become integral parts of the Internet rather than access-only platforms. One of the key design problems is the security in such heterogeneous...
Internet Relay Chat (IRC) is a critical application in military networks for maintaining situational awareness and conducting battle management at all echelons. But these networks are often subject to frequent disconnections, limited bandwidth, and long delays, especially when using satellite services and field radios. Such conditions are inhospitable to TCP, and thus the standard IRC protocol, which...
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