Results 241 to 250 of about 4,641,607 (284)

A new measure of index assignment in dynamic channels

Information Sciences, 2008
In dynamic noisy communication channels, a channel bit error rate (BER) varies with time. When channel distortion measure D"c is a function of bit error rate, an optimal index assignment to minimize D"c is not as uniformly optimal as BER varies. The paper presents a new distortion measure called expected channel distortion (ECD).
Jen-der Day, Jeng-Shyang Pan 0001
openaire   +2 more sources

Asymptotic Bounds on the Performance of a Class of Dynamic Channel Assignment Algorithms

IEEE Journal on Selected Areas in Communications, 1993
Dynamic channel assignment, adapting both to traffic variations as well as to changing mobile locations, is investigated. Several ad hoc schemes of this type have been described in the literature and found to yield interesting performance improvements. However, very little is known about the performance of the optimum assignment schemes. Both upper and
J Zander
exaly   +3 more sources

Dynamic Channel Assignment in Wireless LANs

2008 Workshop on Power Electronics and Intelligent Transportation System, 2008
A traffic-aware and client-aware algorithm for dynamically assigning channels to access points (APs) in wireless local access networks (WLANs) is proposed. Traffic loads and received signal strength (RSS) values are used to characterize interference. The problem of selecting channels to minimize total interference then reduces to the Max k-Cut problem,
Bo Wang, William Wu, Yongqiang Liu
openaire   +1 more source

Dynamic Channel Assignment in IEEE 802.11g

2008 International Wireless Communications and Mobile Computing Conference, 2008
In this paper, we propose a dynamic channel-assignment algorithm which minimizes the total interferences between access points (APs) of a Wireless Local Area Network (WLAN), while maintaining the Signal to Interferences Ratio (SIR) bigger than a certain threshold for all users. The algorithm initializes the channel assignment at the APs, and calculates
Mohammed Boulmalf, Tarik Aouam, Hamid Harroud   +2 more
openaire   +1 more source

Dynamic channel assignment in GSM networks

Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324), 1999
In this paper, we present simulation results on GSM cellular system performances and investigate a dynamic channel allocation (DCA) technique based on GSM metrics RXLEV and RXQUAL. The proposed DCA strategy is combined with a classical slow frequency hopping (SFH) scheme to improve the radio link quality and to provide higher capacity.
L. Le Bris, W. Robion
openaire   +1 more source

Distributed dynamic channel assignment schemes

IEEE 43rd Vehicular Technology Conference, 2002
Some distributed channel schemes for a one-dimensional cellular radio system are described. The channel assignment in the schemes proposed is based on signal strength measurements and therefore gives an improvement in capacity over schemes using reuse distance criterion for channel assignment. The proposed schemes are evaluated by simulations and their
D.J. Goodman, S.A. Grandhi, R. Vijayan
openaire   +1 more source

Channel quality dynamics for wireless packet data with dynamic channel assignment

GLOBECOM 97. IEEE Global Telecommunications Conference. Conference Record, 2002
We investigate how the interference/signal quality varies over time and the effect of channel setup delay on the signal quality for wireless packet data traffic with dynamic channel assignment (DCA). It is found that the SIR/interference conditions under packet data traffic becomes uncorrelated much more rapidly than that under conventional circuit ...
M. Cheng, null Li Fung Chang, J. Wang
openaire   +1 more source

A Dynamic Channel Assignment Scheme for Distributed Antenna Networks

2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 2012
In this paper, we propose a dynamic channel assignment (DCA) scheme for distributed antenna networks (DANs). DANs, in which many antennas are distributed in each cell, significantly reduce the transmit power compared to conventional cellular networks (CNs).
Ryusuke Matsukawa, Tatsunori Obara, Fumiyuki Adachi   +2 more
openaire   +1 more source

Computational challenges of dynamic channel assignment for military MANET

MILCOM 2015 - 2015 IEEE Military Communications Conference, 2015
The electromagnetic spectrum available for military use is increasingly crowded and scarce. The military must efficiently allocate spectrum by reusing channels to the maximum extent possible, while also limiting the number of channel changes over time for systems that require manual channel configuration. The classic channel assignment problem is often
Paul J. Nicholas, Karla L. Hoffman
openaire   +2 more sources

Dynamic channel assignment and routing for cognitive sensor networks

2012 International Symposium on Wireless Communication Systems (ISWCS), 2012
With the increase of the number of wireless sensing or metering devices, the collection of sensing data using wireless communication becomes an important part of many applications. Cognitive radio technology can be used to facilitate the deployment of a bandwidth efficient sensor system.
Celimuge Wu, Satoshi Ohzahata, Toshihiko Kato   +2 more
openaire   +2 more sources