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Power conservation for maximizing the lifetime of the limited battery powered ad hoc networks are one of the most important factors in a network design. Transmitting at high power may assure network connectivity but sacrifice network lifetime and increases the interference as well. Meanwhile transmitting at lower power reduces the interference on the expense on network robustness. We investigate the...
Cognitive radios (CR) and cooperative communications represent new paradigms that both can effectively improve the spectrum efficiency of future wireless networks. In this paper, we investigate the problem of cooperative relay in CR networks for further improved network performance. The objective is to provide an analysis for the comparison of two representative cooperative relay strategies, decode...
Since the pioneering research work of Ahlswede et al. in 2000, Network Coding (NC) has rapidly emerged as a major research area in electrical engineering and computer science due to its wide applicability to communication through real networks. The many contributions available in the literature to date, ranging from pure theoretical studies on fundamental limits to practical experimentations in real-world...
In this paper, the amount of energy saving is studied in cooperative multi-hop wireless sensor networks with the constraint of a given outage probability. In these networks, each node transmits its signal to the next m_coop nodes on the route ending with the sink node. Nakagami channels are considered. Numerical results show that the purposed cooperative routing can provide considerable energy saving...
In this paper, a general framework, called probability-based solution (PBS), is proposed to balance the trade-off between the accessibility (in terms of the success probability to find a route reaching the destination) and the performance (in terms of spectral efficiency, outage probability or energy consumption) of distributed routing schemes in multi-hop wireless networks. In the PBS, the candidate...
We consider the benefits of coding in wireless networks, specifically its role in exploiting the local broadcast property of the wireless medium. We first argue that for unicast, the throughput achieved with network coding is the same as that achieved without any coding. This argument highlights the role of a general max-flow min-cut duality and is more explicit than previous proofs. The maximum throughput...
Recent years have seen an increasing need of wireless networks in a mobile environment serving for more complex tasks and applications. Mobility becomes an indispensable factor of the system design and has been widely recognized as a general cause of packet loss. Though many works have been done on mobility study, to the best of our knowledge, they are mainly based on simulations or analytical studies...
We investigate the cooperative routing problem in the single-source single-destination systems for the delay-sensitive case by using the proposed “Cooperative Graph” approach. The “Cooperative Graph” enumerates all possible cooperative routes in the problem. In a “Cooperative Graph”, a vertex represents a route. For each route, optimal scheduling is required under a total end-to-end duration constraint...
This paper studies energy and throughput performance of cooperative routing in wireless networks that support cooperative beamforming at the physical layer. Cooperative beamforming is a form of cooperative communication in which multiple nodes each equipped with a single omnidirectional antenna coordinate their transmissions in such a way that the individual signals constructively combine at the intended...
In wireless networks, the conventional routing approach is to pre-select the next-hop receiver for a packet based on knowledge of the network topology. However, when the nodes experience fading that changes on the order of the packet duration, a conventional routing approach will often offer poor performance because the pre-selected receiver may not be able to recover the packet because of fading...
A transport layer protocol supporting multihoming allows an application to transmit data via multiple paths simultaneously (termed concurrent multipath transfer, or CMT for short). SCTP is an IETF-supported transport layer protocol with built-in multihoming capability. Earlier work by Iyengar et. al.proposed a CMT protocol using SCTP multihoming for improving application throughput, which studied...
We present a formal model for modeling and reasoning about security protocols. Our model extends standard, inductive, trace-based, symbolic approaches with a formalization of physical properties of the environment, namely communication, location, and time. In particular, communication is subject to physical constraints, for example, message transmission takes time determined by the communication medium...
In this paper, we present a linear programming formulation for the throughput optimization problem in wireless networks that support multi-packet reception (MPR) capability. The formulation takes into account the use of both directional and omni-directional antennas as well as the use of multiple transmitter interfaces per node. The joint routing and scheduling problem is decoupled into routing and...
We present our initial work on the design and of an opportunistic forwarding scheme for a wireless network. The main focus in our work is to take advantage of the interplay of the lower layer parameters and thus decide the design aspects of the forwarding decisions for an adaptive probabilistic opportunistic forwarding scheme. We have already shown that our opportunistic scheme can outperform single...
We study the dissemination of common information from a source to multiple peers within a multihop wireless network, where peers are equipped with uniform omni-directional antennas and have a fixed cost per packet transmission. While many peers may be interested in the dissemination service, their valuation or utility for such a service is usually private information. A desirable routing and charging...
High security and low energy consumption are two of the most important features in implementing today's wireless network systems and applications. They are not totally unrelated in terms of system design. In fact, there is a tradeoff relationship between security and energy. Generally the more secure a system is, the more energy it consumes. In this paper, we integrate a confidentiality (security)...
Recent advances in the physical layer have enabled the simultaneous reception of multiple packets by a node in wireless networks. In this paper, we present a generalized model for the throughput optimization problem in wireless networks that support multi-packet reception (MPR) capability. Our model directly accounts for nodes with multiple transmitter antennas, which can be directional or omni-directional...
Link quality measurement (LQM), i.e. packet reception ratio (PRR) measurement, is becoming an indispensable component in multihop wireless networks. However, in all the existing LQM mechanisms, a common fact is that a node's knowledge about the forward PRR from itself to its neighbor is informed by the neighbor. On the one hand, this receiver- dependent measurement provides accurate and timely updates...
In this paper, we analyze the transport capacity characteristic of VANET in 802.11. Based on these, the collision and interference of VANET are also studied. A probability analysis model is applied in VANET. The number of collision/interference source impacted packets transmission-receive according to the probability model. A new scheme -one hop one channel, is proposed for multi-interface routing...
Multimedia applications have been widely developed. These applications use TCP-friendly congestion control mechanisms. One of the congestion control mechanisms which multimedia applications use is the TCP-friendly rate control (TFRC). This mechanism is designed for wired networks which any packet loss indicates congestion loss and the sending rate is reduced correspondingly. In this paper, we propose...
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