The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For the design of a network layer routing scheme for Underwater Wireless Sensor Network (UWSN), physical layer cooperation is used in this paper which ensures energy efficiency. For achieving major goal of efficient data routing, a key factor is reliability for application-oriented UWSNs. All the nodes of network fortified by a unidirectional antenna cooperatively perform their propagation of data...
Nanonetworks comprise numerous wireless nodes, assembled at micro-to-nano scale. The unique manufacturing challenges and cost considerations of these networks make for minimal complexity solutions at all network layers. From a networking aspect, packet retransmissions should be kept minimal, while ensuring communication between any two nanonodes. In addition, assigning unique addresses to nanonodes...
Wireless mesh networks (WMNs) are emerging as a cost effective solution for last-mile broadband access. Multiple antennas or multiple input multiple output (MIMO)-based systems have the potential for improving the capacity of these networks manifolds. However, unique physical layer characteristics associated with MIMO-based systems require joint design among physical layer and upper layers. In this...
Wireless Mesh Networks (WMNs) have emerged as a cost effective and promising technology to provide broadband connectivity in several environments. In this work, we consider a cross layer optimal design of routing, medium access control (MAC) scheduling, and physical layer resource allocation for WMNs, where nodes are equipped with Multiple Input Multiple Output (MIMO) antennas. MIMO antennas can greatly...
We consider the problem of using multiple antennas to maximize end-to-end performance in a multi-hop ad hoc wireless network with opportunistic routing. We find that when a single data stream is sent per hop, performance is maximized by aggressively increasing spatial reuse, as opposed to increasing per-hop length or rate. We also show that using spatial multiplexing to transmit multiple streams per...
Most of the MAC and routing protocols proposed for wireless ad hoc networks are based on omni-directional antenna. Omni-directional antenna distributes energy in all directions, not only causing unnecessary interference to other nodes, but also reducing the potential range of the transmission. In this paper, we propose a novel medium access control and routing protocols for wireless ad hoc networks...
In this work a cross-layer optimization in centralized Wireless Mesh Networks equipped with multiple antennas is introduced. A scenario has been considered in which multiple antennas at each node are employed to suppress the interference through beam-forming. By integrating different constraints from MAC and Network layers, a mathematical LP formulation is presented to minimize the system activation...
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...
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...
The traditional networking builds on layered protocol architecture to isolate the complexities in different layers. It has been realized that real-life wireless sensor networks (WSNs) must be considered holistically across different layers for optimum performance. We consider a special case of WSNs that is deployed in underground tunnels. Underground communications present unique signal propagation...
In this paper, the wireless mesh backhaul using MIMO systems has been studied. In the mesh networking, information is routed from source to destination over multiple wireless links. On the other hand, using wireless MIMO systems, the channel capacity is significantly increased without additional signal power or bandwidth. We have used the linear programming to optimize the routing determination and...
In this paper, we introduce and evaluate ScaleMesh, a scalable miniaturized dual-radio wireless mesh testbed based on IEEE 802.11b/g technology- ScaleMesh can emulate large-scale mesh networks within a miniaturized experimentation area by adaptively shrinking the transmission range of mesh nodes by means of variable signal attenuators. To this end, we derive a theoretical formula for approximating...
Multiple-input-multiple-output (MIMO) transceivers can take advantage of random channel fading and multi-path delay spread for multiplying transfer rates (multiplexing gain), improve transmission quality/reliability (diversity gain) at no cost of extra spectrum, or allow the spatial separation of the signals of different transceivers in a multi-user scenario, thus providing a multiple-access gain.
We study the problem of transmission-side diversity and routing in a static wireless network. It is assumed that each node in the network is equipped with a single omnidirectional antenna and that multiple nodes are allowed to coordinate their transmissions in order to obtain energy savings. We derive analytical results for achievable energy savings for both line and grid network topologies. It is...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.