26,599 research outputs found
Readout Electronics for Flat Panel PSPMT with Multiple CPU and Full Parallel Acquisition
No full textAuthor Peter FitzSimons speaking at the National Library of Australia, Canberra, 13 November 2012 /
No full textTitle from acquisitions documentation.; Part of the collection: Portraits of author Peter FitzSimons speaking at the National Library of Australia, Canberra, 13 November 2012.; Acquired in digital format; access copy available online.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
Modeling and analysis of slow CW decrease IEEE 802.11 WLAN
No full textThe IEEE 802.11 medium access control (MAC) protocol provides a contention-based distributed channel access mechanism for mobile stations to share the wireless medium, which may introduce a lot of collisions in case of overloaded active stations. Slow contention window (CW) decrease scheme is a simple and efficient solution for this problem. In this paper, we use an analytical model to compare the slow CW decrease scheme to the IEEE 802.11 MAC protocol. Several parameters are investigated such as the number of stations, the initial CW size, the decrease factor value, the maximum backoff stage and the coexistence with the RequestToSend and ClearToSend (RTS/CTS) mechanism. The results show that the slow CW decrease scheme can efficiently improve the throughput of IEEE 802.11, and that the throughput gain is higher when the decrease factor is larger. Moreover, the initial CW size and maximum backoff stage also affect the performance of slow CW decrease scheme
Guest Editorial Introduction to the Special Issue on the 2022 IEEE International Solid-State Circuits Conference (ISSCC)
No full textThe International Technical Program Committee (ITPC) of the IEEE International Solid-State Circuits Conference (ISSCC) selects outstanding articles from the papers presented at the conference and invites the authors to submit an extended manuscript to the Special Issue of IEEE Journal of Solid-State Circuits (JSSC). This November issue contains the selected papers from the Imagers, microelectromechanical systems (MEMS), and Displays (IMMD) and the Technology Directions (TD) sub-committees. Papers from Analog, Data Converters, Power Management, RF, and Wireless subcommittees are included in the December issue. Finally, the January issue will contain papers from Digital Architectures and Systems, Digital Circuits, Machine Learning, Memory, and Wireline subcommittees.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Quantum Circuit Architectures and Technolog
A selective delayed channel access (SDCA) for the high-throughput IEEE 802.11n
No full textAbstract— In this paper we investigate the potential benefits of a selective delayed channel access algorithm (SDCA) for the future IEEE 802.11n based high-throughput networks. The proposed solution aims to resolve the poor channel utilization and the low efficiency that EDCA’s high priority stations adhere due to shorter waiting times and consequently to the network’s degrading overall end performance. The algorithm functions at the MAC level where it delays the packets from being transmitted by postponing the channel access request, based on their traffic characteristics. As a result, the flow’s average aggregate size increases and consequently so is the channel efficiency. However, in some situations we notice that further deferring has a negative impact with TCP applications, thus we further introduce a traffic awareness feature that allows the algorithm to distinguish which flows are using the TCP protocol and override any additional MAC delay. We validate through various simulations that SDCA improves throughput significantly and maximizes channel utilization
Portrait of Paul Ham at the National Library of Australia, 15 November 2011 /
No full textTitle from nformation supplied by photographer.; Part of the collection: Podcast photograph of author Paul Ham at the National Library of Australia, 15 November 2011.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
Evaluation study of IEEE 1609.4 performance for safety and non-safety messages dissemination
No full textThe IEEE 1609.4 was developed to support multi-channel operation and channel switching procedure in order to provide both safety and non-safety vehicular applications. However, this protocol has some drawback because it does not make efficient usage of channel bandwidth resources for single radio WAVE devices and suffer from high bounded delay and lost packet especially for large-scale networks in terms of the number of active nodes. This paper evaluates IEEE 1609.4 multi-channel protocol performance for safety and non-safety application and compare it with the IEEE 802.11p single channel protocol. Multi-channel and single channel protocols are analyzed in different environments to investigate their performance. By relying on a realistic dataset and using OMNeT++ simulation tool as network simulator, SUMO as traffic simulator and coupling them by employing Veins framework. Performance evaluation results show that the delay of single channel protocol IEEE 802.11p has been degraded 36% compared with multi-channel protocol
Conference Report : 2015 IEEE International Future Energy Electronics Conference (IEEE IFEEC 2015) November 1-4 2015 Taipei Taiwan
No full text2015 IEEE International Future Energy Electronics Conference (IEEE IFEEC 2015)
November 1-4 2015 Taipei Taiwanjournal articl
Modeling link adaptation algorithm for IEEE 802.11 wireless LAN networks
No full textLink adaptation is a critical component of IEEE 802.11 systems. In this paper, we analytically model a retransmission based Auto Rate Fallback (ARF) link adaptation algorithm. Both packet collisions and packet corruptions are modeled with the algorithm. The models can provide insights into the dynamics of the link adaptation algorithms and configuration of algorithms parameters. It is also observed that when the competing number of stations is high, packet collisions can largely affected the performance of ARF and make ARF operate with the lowest date rate, even when no packet corruption occur. This is in contrast to the existing assumption that packet collision will not affect the correct operation of ARF and can be ignored in the evaluation of ARF. The work presented in this paper can provide guidelines on configuring the link adaptation algorithms and designing new link adaptation algorithms for future high speed 802.11 systems
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