Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Keyword
-
- Ad hoc networks (2)
- MIMO (2)
- Multiple-input multiple-output communications (2)
- Spectral Efficiency (2)
- Advanced Distributed Learning-Registry (ADL-R) (1)
-
- Algorithms--Data processing (1)
- Buffer delay (1)
- CORDRA registry (1)
- Client–server computing (1)
- Computer networks (1)
- DSpace (1)
- Digital libraries (1)
- Digital library (1)
- Digital preservation (1)
- Distributed computing (1)
- End-to-end latency (1)
- Fault tolerance (1)
- FeDCOR (1)
- Independent component analysis (ICA) algorithm (1)
- Institutional repository (1)
- Mobile communication (1)
- Network protocols (1)
- Online learning algorithm (1)
- Optimum block adaptive ICA algorithm (1)
- Parallel Computer Architecture (1)
- Performance evaluation (1)
- QoS (1)
- Robot behavior (1)
- Search engines (1)
- Switching theory--Data processing (1)
Articles 1 - 9 of 9
Full-Text Articles in Engineering
An Experimental Analysis Of The Call Capacity Of Ieee 802.11b Wireless Local Area Networks For Voip Telephony, Brian Keegan, Mark Davis
An Experimental Analysis Of The Call Capacity Of Ieee 802.11b Wireless Local Area Networks For Voip Telephony, Brian Keegan, Mark Davis
Conference papers
In this paper we present the results from an experimental study of the call capacity of an IEEE 802.11b network when using VoIP telephony. Experiments include increasing the number of VoIP users in a wireless test-bed and increasing the level of background traffic until network saturation occurs. The experiments allow us to perform an analysis of the access point (AP) buffer dynamics. Results show that the network is capable of supporting up to 16 VoIP stations (STAs). Due to the operation of the IEEE 802.11 medium access control (MAC) mechanism, the AP acts as a bottleneck for all traffic destined …
End-To-End Latency Of A Fault-Tolerant Corba Infrastructure, Wenbing Zhao, Louise E. Moser, P. Michale Melliar-Smith
End-To-End Latency Of A Fault-Tolerant Corba Infrastructure, Wenbing Zhao, Louise E. Moser, P. Michale Melliar-Smith
Electrical and Computer Engineering Faculty Publications
This paper presents an evaluation of the end-to-end latency of a fault-tolerant CORBA infrastructure that we have implemented. The fault-tolerant infrastructure replicates the server applications using active, passive and semi-active replication, and maintains strong replica consistency of the server replicas. By analyses and by measurements of the running fault-tolerant infrastructure, we characterize the end-to-end latency under fault-free conditions. The main determining factor of the run-time performance of the fault-tolerant infrastructure is the Totem group communication protocol, which contributes to the end-to-end latency primarily in …
A Gradient-Based Optimum Block Adaptation Ica Technique For Interference Suppression In Highly Dynamic Communication Channels, Wasfy B. Mikhael, Tianyu Yang
A Gradient-Based Optimum Block Adaptation Ica Technique For Interference Suppression In Highly Dynamic Communication Channels, Wasfy B. Mikhael, Tianyu Yang
Department of Electrical Engineering and Computer Science - Daytona Beach
The fast fixed-point independent component analysis (ICA) algorithm has been widely used in various applications because of its fast convergence and superior performance. However, in a highly dynamic environment, real-time adaptation is necessary to track the variations of the mixing matrix. In this scenario, the gradient-based online learning algorithm performs better, but its convergence is slow, and depends on a proper choice of convergence factor. This paper develops a gradient-based optimum block adaptive ICA algorithm (OBA/ICA) that combines the advantages of the two algorithms. Simulation results for telecommunication applications indicate that the resulting performance is superior under time-varying conditions, which …
Mimo Communications In Ad Hoc Networks, Biao Chen, Michael J. Gans
Mimo Communications In Ad Hoc Networks, Biao Chen, Michael J. Gans
Electrical Engineering and Computer Science - All Scholarship
We study in this paper the network spectral efficiency in terms of bits/s/Hz of a MIMO (multiple-input multiple output) ad hoc network with K simultaneous communicating transmitter-receiver pairs. Assume that each transmitter is equipped with t antennas and each receiver implements single user detection. We show that in the absence of channel state information (CSI) at the transmitters, the asymptotic network spectral efficiency is limited by r nats/s/Hz as K -> ∞ and is independent of t and the transmit power. With CSI corresponding to the desired receiver available at the transmitter, we demonstrate that the asymptotic spectral efficiency is …
Mimo Communications In Ad Hoc Networks, Biao Chen, Michael J. Gans
Mimo Communications In Ad Hoc Networks, Biao Chen, Michael J. Gans
Electrical Engineering and Computer Science - All Scholarship
We study in this paper the network spectral efficiency in terms of bits/s/Hz of a MIMO (multiple-input multiple output) ad hoc network with K simultaneous communicating transmitter-receiver pairs. Assume that each transmitter is equipped with t antennas and each receiver implements single user detection. We show that in the absence of channel state information (CSI) at the transmitters, the asymptotic network spectral efficiency is limited by r nats/s/Hz as K -> ∞ and is independent of t and the transmit power. With CSI corresponding to the desired receiver available at the transmitter, we demonstrate that the asymptotic spectral efficiency is …
Efficient Scheduling For Sdmg Cioq Switches, Mei Yang, S. Q. Zheng
Efficient Scheduling For Sdmg Cioq Switches, Mei Yang, S. Q. Zheng
Electrical & Computer Engineering Faculty Research
Combined input and output queuing (CIOQ) switches are being considered as high-performance switch architectures due to their ability to achieve 100% throughput and perfectly emulate output queuing (OQ) switch performance with a small speedup factor S. To realize a speedup factor S, a conventional CIOQ switch requires the switching fabric and memories to operate S times faster than the line rate. In this paper, we propose to use a CIOQ switch with space-division multiplexing expansion and grouped input/output ports (SDMG CIOQ switch for short) to realize speedup while only requiring the switching fabric and memories to operate at the line …
Observed Web Robot Behavior On Decaying Web Subsites, Joan A. Smith, Frank Mccown, Michael L. Nelson
Observed Web Robot Behavior On Decaying Web Subsites, Joan A. Smith, Frank Mccown, Michael L. Nelson
Computer Science Faculty Publications
We describe the observed crawling patterns of various search engines (including Google, Yahoo and MSN) as they traverse a series of web subsites whose contents decay at predetermined rates. We plot the progress of the crawlers through the subsites, and their behaviors regarding the various file types included in the web subsites. We chose decaying subsites because we were originally interested in tracking the implication of using search engine caches for digital preservation. However, some of the crawling behaviors themselves proved to be interesting and have implications on using a search engine as an interface to a digital library.
Fedcor: An Institutional Cordra Registry, Giridhar Manepalli, Henry Jerez, Michael L. Nelson
Fedcor: An Institutional Cordra Registry, Giridhar Manepalli, Henry Jerez, Michael L. Nelson
Computer Science Faculty Publications
FeDCOR (Federation of DSpace using CORDRA) is a registry-based federation system for DSpace instances. It is based on the CORDRA model. The first article in this issue of D-Lib Magazine describes the Advanced Distributed Learning-Registry (ADL-R) [1], which is the first operational CORDRA registry, and also includes an introduction to CORDRA. That introduction, or other prior knowledge of the CORDRA effort, is recommended for the best understanding of this article, which builds on that base to describe in detail the FeDCOR approach.
Network Neutrality And The Economics Of Congestion, Christopher S. Yoo
Network Neutrality And The Economics Of Congestion, Christopher S. Yoo
All Faculty Scholarship
No abstract provided.