transmission capacity of wireless ad hoc networks with outage constraints pdf
Báo cáo hóa học: " Research Article On Wireless Ad Hoc Networks with Directional Antennas: Efficient Collision and Deafness Avoidance Mechanisms" ppt
... schemes have been proposed for wireless ad hoc networks with directional antennas. In principle, most of the proposed MAC protocols [11, 20–30] for ad hoc networks with directional antennas are ... is true in most casesin ad hoc networks with omnidirectional transmissions, ifRTS/CTS frames do not collide with other transmissions; with the directional transmission of RTS/CTS frames, thisassumption ... communicates directly with nodes within its wireless range and indirectly with othernodes using a dynamically computed, multihop route.In wireless ad hoc networks, the nonexistence of acentralized...
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Báo cáo hóa học: " Improving TCP Performance over Wireless Ad Hoc Networks with Busy Tone Assisted Scheme" pdf
... performance degrades severely in IEEE 802.11-basedwirelessadhoc networks. We first identify two critical issues leading to the TCP performance degradation: (1) unreliable broadcast, since broadcastframes ... whensender S broadcasts, T is the number of slots to transmit thebroadcast packet; or (b) even if there is another transmission, none of the one-hop neighbors of S is in the transmission range of the ... management in intercon-nected wireless/ wireline networks, UWB wireless communications systems, wireless security, and ad hoc and sensor networks. He is a coauthor of two books, and has published...
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Báo cáo hóa học: " A survey of performance enhancement of transmission control protocol (TCP) in wireless ad hoc networks" pptx
... in wireless ad hoc networks TCP was designed for wired networks without consider-ing the complexity of wireless networks. With theadvent of wireless technology TCP was also employed in wireless ... theperformance degradation of TCP in wireless ad hoc networks. The research community has produced a wide range of proposals to improve the performance of TCP in wireless ad hoc networks. This article ... in ad hoc wireless, networks. Ad hoc Netw. 4, 687–708 (2006). doi:10.1016/j.adhoc.2005.08.00137. E Hamadani, V Rakocevic, A cross layer solution to address TCP, intra-flowperformance degradation...
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Báo cáo hóa học: " Research Article On the Throughput Capacity of Large Wireless Ad Hoc Networks Confined to a Region of Fixed Area" pptx
... being wireless. Cellular phonesand wireless networks using 802.11 (WI-FI) are examples of this. Ad hoc networks are another type of wireless networks. They are formed by a collection of nodes without ... of throughput capacity of ad hoc wire-less networks has received a lot of attention starting with the article [1] in which it was shown that the throughput of random networks with uniform spatial ... INTRODUCTION Wireless networks consist of a number of nodes which com-municate with each other using high-frequency radio waves.Some of these networks have a wired backbone or infrastruc-ture with...
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Báo cáo hóa học: " Research Article Throughput Capacity of Ad Hoc Networks with Route Discovery" potx
... February 2007Recommended by Ananthram SwamiThroughput capacity of large ad hoc networks has been shown to scale adversely with the size of network n. However the needfor the nodes to find or ... INTRODUCTIONIn wireless ad hoc networks, the terminals (nodes) commu-nicate without the aid of any infrastructure. There are manychallenges involved in the design of these networks. One par-ticular ... probability of its success was established by analyti-cal means.The subject of this paper is the effect of the route dis-covery process (RDP) on the throughput capacity of ad hoc networks. Previous...
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Báo cáo hóa học: "Research Article OMNeT++-Based Cross-Layer Simulator for Content Transmission over Wireless Ad Hoc Networks" pot
... OMNeT++ for the study of transmission of data and multimedia content over hybridwired /wireless ad hoc networks and the design of innovativeradio access schemes. Details of the API allowing high-fidelity ... salient effect of this scheme is to dramatically simplifythe duplication of messages sent on the radio channel. In fact,before the transmission over the radio channel, instead of duplicating ... analyze theresilience of the signaling protocol when subject to radiochannel effects. Such a header is added to the bytes of DL-PDU payload, similarly to the UDP and IP headers aspresented in...
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Báo cáo hóa học: " On the Geometrical Characteristics of Three-Dimensional Wireless Ad Hoc Networks and Their Applications" pptx
... performance of wire-less ad hoc networks. Generally, wireless ad hoc networks can be modelled inthe framework of random graph. Nodes and links of a net-workareconsideredasverticesandedgesofarandomgraphG(V,E), ... simulation.4. NETWORK CAPACITY As mentioned above, the max-flow capacity is another im-portant parameter on the performance of network. However,in the case of wireless ad hoc networks, it is extremely ... EURASIP Journal on Wireless Communications and NetworkingFigure 1: Random graph model of wireless ad hoc network.able to communicate with each other directly with a givencovering radius, and it...
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WIRELESS AD-HOC NETWORKS docx
... Section 3 Wireless Ad- Hoc Networks4 Section 1MAC Protocols for Wireless Ad- Hoc Networks WIRELESS AD- HOC NETWORKS Edited by Hongbo Zhou Comparison of the Maximal Spatial Throughput of Aloha ... when the offered load exceeds Wireless Ad- Hoc Networks4 2 12 Mobile Ad- Hoc Networks Remark 4.1. In the absence of fading the maximum throughput of 0.068 (unit-size packets per unit of time and ... requirements for different classes of services. The main techniques Wireless Ad- Hoc Networks2 4 Comparison of the Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad- Hoc Networks 1310.5772/53264...
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security for wireless ad hoc networks
... vulnerabilities of ad hoc networks, some reside in their routing,others in their use of wireless links and still some others in their auto-configuration mech-anisms. These key functionalities of ad hoc networks ... used, especially in the context of broad-cast authentication. Broadcast ing and multicasting are used widely in a variety of appli-cations in wireless ad hoc networks. Example applications include ... compared with cellul ar networks. In fact, these networks arecalled WLAN networks since they typically provide the equivalent of LAN connectivityFigure 1.3. Architecture of cellular networks. 1.1...
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Báo cáo hóa học: " Coherence time-based cooperative MAC protocol 1 for wireless ad hoc networks" doc
... protocol1for wireless ad hoc networks Murad Khalid1*, Yufeng Wang1, Ismail Butun1, Hyung-jin Kim2, In-ho Ra3and Ravi Sankar1AbstractIn this article, we address the goal of achieving ... is thenotion of “Cooperative Communication” in ad hoc net-works. Cooperative communication harnesses the broad-cast nature of the wireless cha nnel and uses spatialdiversity of independent ... com-pared for increasing number of source nodes in the ad hoc network. All the nodes are randomly placed in aradius of 200 m. Concurrent transmissions always leadto collisions. Propagation delay...
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Báo cáo hóa học: "Research Article Transmission Strategies in MIMO Ad Hoc Networks" pot
... based on theoptimization of the quality of the received signal rather thanthe system capacity. In MIMO ad hoc networks, the transmission scheme of each user depends on that of other users since ... theproblem of capacity maximization and prove the fruitfulness of using MIMO techniques. However, evidencing this poten-tiality in the case of ad hoc networks is not a trivial problem.In these networks, ... ad hoc networks. The rest of this paper is organized as follows. In Section 2,a review of the pertinent works on the precoding methodsin MIMO ad hoc networks is presented. In Section 3,the capacity...
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Báo cáo hóa học: "Research Article Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks" ppt
... INfor improving the quality of video streams over multi-hop wireless ad hoc networks. Previous works on improving the quality of videostreaming over a wireless ad hoc network include differentaspects, ... streaming over a multihop wireless ad hoc network.In a multihop wireless ad hoc network, the quality of transferring real-time video streams could be seriously degraded, since everyintermediate ... a wireless ad hoc network could suffer serious QoS degradation because stalevideo packets are useless even if they can reach destinationsuccessfully. Serious packet delays on a wireless ad hoc...
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Báo cáo hóa học: " Research Article QoS-Aware Maximally Disjoint Routing in Power-Controlled Multihop CDMA Wireless Ad Hoc Networks" pdf
... for multihop CDMA wireless ad hoc networks. Aframework of power control with QoS constraints in CDMA w ireless ad hoc networks is introduced and the feasibility condition of the power control ... for multihop wireless ad hoc networks (consideredin this paper), where multiple concurrent transmissions areallowed.Power control is applied in a wireless ad hoc networkto control transmission ... wire-less ad hoc networks. In a wireless ad hoc network architecture, MAC proto-col plays a critical role in optimizing bandwidth efficiencyand resolving collisions due to the broadcast nature of wire-less...
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Báo cáo hóa học: " Research Article Spatial Multiplexing Gains for Realistic Sized Ad Hoc Networks with Directional Antenna Arrays" pdf
... MIMO ad hoc networks, ” IEEE Wire-less Communications, vol. 13, no. 4, pp. 62–76, 2006.[16] R. Ramanathan, “On the performance of ad hoc networks with beamforming antennas,” in Proceedings of ... bound on the throughput of a lattice ad hoc network with infinitely narrow beamwidth.Theorem 4. The uniform throughput T for an ad hoc networkon a square lattice with g beams of zero width for each ... concentrate on an ad hoc network model with nodes on integer lattice points over a 2D plane. We examine the limits of ad hoc network performance for systems with antenna arrays capable of allowing...
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Báo cáo hóa học: " TCP-M: Multiflow Transmission Control Protocol for Ad Hoc Networks" doc
... ad hoc networks [6]. After study-ing issues with the TCP in ad hoc networks, the authorshave taken a new approach using ATP to improve the per-formance of the transport layer protocol in ad ... demon-strated by other paths. In the case of ad hoc networks, pathunavailability leads to another route discovery process, whichfurther deteriorates ad hoc network performance:Ttransfer(N) ... involvedin using the TCP in a multipath ad hoc network environ-ment.3. TCP PERFORMANCE IN MULTIPATH AD HOC NETWORKS The TCP was originally designed for wired networks wherethe packet drop is generally...
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