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Results 1 - 10
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3,709
Advanced Radio Channel Model for Magic WAND
- in Conf. Proc. ACTS Mobile Telecommunications Summit'96
, 1996
"... : The stochastic radio channel model (SRCM) derived within the Magic WAND project takes into account all propagation effects which have an impact on the system performance. Special attention has been paid to obtain an accurate description of the time and direction dispersive character of real rad ..."
Abstract
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Cited by 4 (3 self)
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: The stochastic radio channel model (SRCM) derived within the Magic WAND project takes into account all propagation effects which have an impact on the system performance. Special attention has been paid to obtain an accurate description of the time and direction dispersive character of real
Cognitive Radio: Brain-Empowered Wireless Communications
, 2005
"... Cognitive radio is viewed as a novel approach for improving the utilization of a precious natural resource: the radio electromagnetic spectrum. The cognitive radio, built on a software-defined radio, is defined as an intelligent wireless communication system that is aware of its environment and use ..."
Abstract
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Cited by 1541 (4 self)
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the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks. 1) Radio-scene analysis. 2) Channel-state estimation and predictive modeling. 3) Transmit-power control and dynamic spectrum management
Topology Control of Multihop Wireless Networks using Transmit Power Adjustment
, 2000
"... We consider the problem of adjusting the transmit powers of nodes in a multihop wireless network (also called an ad hoc network) to create a desired topology. We formulate it as a constrained optimization problem with two constraints- connectivity and biconnectivity, and one optimization objective- ..."
Abstract
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Cited by 688 (3 self)
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minimum power. We analyze the throughput, delay, and power consumption of our algorithms using a prototype software implementation, an emulation of a power-controllable radio, and a detailed channel model. Our results show that the performance of multihop wireless networks in practice can be substantially
Routing In Clustered Multihop, Mobile Wireless Networks With Fading Channel
, 2005
"... A clusterhead-token infrastructure for multihop, mobile wireless networks has been designed. Traditional routing algorithms in wireline networks are not feasible for mobile wireless environment due to the dynamic change in link connectivity. To gain better performance for clustered multihop, mobile ..."
Abstract
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Cited by 368 (9 self)
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compared with shortest-pathscheme, making multimedia tra c viable. A radio channel model has been included to investigate the impact of channel fading on our protocols. To reduce the run time, a parallel simulator has been designed. Speedups of up to tenfold have been observed on a 16 processor SP/2.
Characterizing the capacity region in multi-radio multi-channel wireless mesh networks
- in ACM MobiCom
, 2005
"... Next generation fixed wireless broadband networks are being increasingly deployed as mesh networks in order to provide and extend access to the internet. These networks are characterized by the use of multiple orthogonal channels and nodes with the ability to simultaneously communicate with many nei ..."
Abstract
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Cited by 244 (0 self)
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neighbors using multiple radios (interfaces) over orthogonal channels. Networks based on the IEEE 802.11a/b/g and 802.16 standards are examples of these systems. However, due to the limited number of available orthogonal channels, interference is still a factor in such networks. In this paper, we propose a
Rayleigh Fading Channels in Mobile Digital Communication Systems Part I: Characterization
- IEEE Communications Magazine
, 1997
"... When the mechanisms of fading channels were first modeled in the 1950s and 1960s, the ideas were primarily applied to over-thehorizon communications covering a wide range of frequency bands. The 3–30 MHz high-frequency (HF) band is used for ionospheric communications, and the 300 MHz–3 GHz ultra-hig ..."
Abstract
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Cited by 259 (0 self)
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-high-frequency (UHF) and 3–30 GHz super-high-frequency (SHF) bands are used for tropospheric scatter. Although the fading effects in a mobile radio system are somewhat different than those in ionospheric and tropospheric channels, the early models are still quite useful to help characterize fading effects in mobile
On the Performance of Ad Hoc Networks with Beamforming Antennas
- ACM MobiHoc
, 2001
"... Beamforming antennas have the potential to provide a fundamental breakthrough in ad hoc network capacity. We present a broad-based examination of this potential, focusing on exploiting the longer ranges as well as the reduced interference that beamforming antennas can provide. We consider a number o ..."
Abstract
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Cited by 287 (6 self)
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of enhancements to a conventional ad hoc network system, and evaluate the impact of each enhancement using simulation. Such enhancements include \aggressive" and \conservative " channel access models for beamforming antennas, link power control, and directional neighbor discovery. Our simulations
Avrora: Scalable Sensor Network Simulation With Precise Timing
- IN PROC. OF THE 4TH INTL. CONF. ON INFORMATION PROCESSING IN SENSOR NETWORKS (IPSN
, 2005
"... Simulation can be an important step in the development of software for wireless sensor networks and has been the subject of intense research in the past decade. While most previous efforts in simulating wireless sensor networks have focused on protocol-level issues utilizing models of the software i ..."
Abstract
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Cited by 270 (5 self)
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implementation, a significant challenge remains in precisely measuring time-dependent properties such as radio channel utilization. One promising approach, first demonstrated by ATEMU, is to simulate the behavior of sensor network programs at the machine code level with cycle-accuracy, but poor performance has
Analyzing the transitional region in low power wireless links
- In First IEEE International Conference on Sensor and Ad hoc Communications and Networks (SECON
, 2004
"... Abstract — The wireless sensor networks community, has now an increased understanding of the need for realistic link layer models. Recent experimental studies have shown that real deployments have a “transitional region ” with highly unreliable links, and that therefore the idealized perfect-recepti ..."
Abstract
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Cited by 241 (16 self)
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quantification of their influence. Specifically, we derive expressions for the packet reception rate as a function of distance, and for the width of the transitional region. These expressions incorporate important channel and radio parameters such as the path loss exponent and shadowing variance of the channel
Stochastic Radio Channel Model For Advanced Indoor Mobile Communication Systems
- Tech. Rep. COST 259 TD (98) 057, COST 259
, 1997
"... A stochastic radio channel model (SRCM) for broadband indoor mobile systems operating at 5.2 and 17 GHz has been derived within the ACTS project AC085 Magic WAND. The SRCM accurately describes the dispersive nature of real radio channels in time, frequency, direction, and polarization. These effects ..."
Abstract
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Cited by 17 (5 self)
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A stochastic radio channel model (SRCM) for broadband indoor mobile systems operating at 5.2 and 17 GHz has been derived within the ACTS project AC085 Magic WAND. The SRCM accurately describes the dispersive nature of real radio channels in time, frequency, direction, and polarization
Results 1 - 10
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3,709
