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International Conference on Broadband Networks (BroadNets)

作者： A. Doha H. Hassanein Telecommunications Research Lab Department of Electrical and Computer Engineering Queen's University ONT Canada Telecommunications Research Lab School of Computing Queen's University ONT Canada

Most of today's broadband networks, including the recently ratified IEEE 802.16 standard, employ reservation based multiple media access control. A problem pertinent to reservation MAC protocols is the division of frame slots between the contention and data transmission processes. In most of the reservation MAC protocols no specific ratio is standardized, leaving proprietary solutions address the local network environment. As both processes are equally important for maintaining efficient delay and throughput performance, a solution must consider the timely varying traffic load. For example, heterogeneity and cooperation of networks promote access technologies that can sustain waves of increasing traffic load. In this paper, we start by instituting a framework for efficient allocation of frame resources to the contention and data transmission processes in light of the delay and throughout performance. We then propose a dynamic resource allocation controller based on a Markovian optimization model, where the optimization parameters are tuned according to specific preferential criteria of service providers. Our model achieves opportunistic performance improvements, on a per frame basis, over the best-case static allocation. Through simulation, we study the merits of our proposed optimized controller with respect to the framework. We show by illustrative examples and numerical results that the controller successfully fulfills the framework objectives.

关键词： Access protocols Broadband communication Delay Media Access Protocol Data communication Throughput Telecommunication traffic Resource management Hybrid fiber coaxial cables Time division multiple access

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An 8 GHz ultra wideband transceiver prototyping testbed

An 8 GHz ultra wideband transceiver prototyping testbed

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International Workshop on Rapid System Prototyping (RSP)

作者： D. Agarwal C.R. Anderson P.M. Athanas Configurable Computing Lab Virginia Polytechnic Institute and State University Blacksburg VA USA Mobile and Portable Radio Research Group Bradley Department of Electrical Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Software defined radios have the potential of changing the fundamental usage model of wireless communications devices, but the capabilities of these transceivers are often limited by the speed of the underlying processors and FPGAs. This paper presents a testbed for the design of an impulse-based ultra wideband communication system. The transceiver is being developed using software/reconfigurable radio concepts and will be implemented using commercially available off-the-shelf components. The receiver uses eight 1 GHz ADCs to perform time interleaved sampling at an aggregate rate of 8 Gsamples/s. The high sampling rates present extraordinary demands on the down-conversion resources. The output of each ADC is in a different clock domain, with clocks offset in increments of 125 ps. Samples are captured by the high-speed ADC and processed using a Xilinx Virtex-II Pro (XC2VP70) FPGA. The testbed has two components: a non-real time part for data capture and signal acquisition, and a real-time part for data demodulation and signal processing. The non-real time component uses the internal block RAMs to store a set of samples and one of the PowerPC cores to process the data offline, to minimize logic resource usage. The real-time part uses distributed memory to store incoming data and processes it using hardwired multipliers and FPGA logic cells. The overall objective is to demonstrate a testbed that will allow researchers to evaluate different UWB modulation, multiple access, and coding schemes, and will support raw data rates of up to 100 MB/s.

关键词： Ultra wideband technology Transceivers Prototypes Testing Field programmable gate arrays Software radio Sampling methods Clocks Signal processing Logic

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On reducing the operational cost of bandwidth adaptation algorithms

On reducing the operational cost of bandwidth adaptation alg...

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International Conference on Broadband Networks (BroadNets)

作者： A.-E.M. Taha H.S. Hassanein H.T. Mouftah Telecommunications Research Lab Department of Electrical and Computer Engineering Queen's University Kingston ONT Canada School of Computing Queen's University Kingston ONT Canada Center for Research in Photonics School of Information Technology and Engineering Ottawa University Ottawa ONT Canada

Bandwidth adaptation algorithms (BAA) assume an integral role in radio resource management (RRM) frameworks for future wireless networks. Taking advantage of the nature of adaptive multimedia application, they empower system providers with allocation versatility and economic increase. Due to the dynamic nature to be witnessed in future networks, BAA has been set to be trigger at every change in the system state. This burdens the different entities involved in RRM. In this work, the concept of stochastically triggered BAA (STBAA) is proposed. The tradeoff between admission ratios and users satisfaction is evaluated. It is found that considerable gains can still be achieved with the adaptation not fully engaged

关键词： Costs Bandwidth Resource management Wireless networks Multimedia systems Linear programming Quality of service Performance evaluation Call admission control Radio control

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Journal of Information Science and engineering: Editorial notice

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Journal of Information Science and engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

No abstract available

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Microwave spectral analysis using optical spectral holeburning

Microwave spectral analysis using optical spectral holeburni...

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2004 IEEE International Topical Meeting on Microwave Photonics - Technical Digest, MWP'04

作者： Mohan, R. Krishna Cole, Zachary Reibel, Randy R. Chang, Tiejun Merkel, Kristian D. Babbitt, Wm. Randall Colice, Max Schlottau, Friso Wagner, Kelvin H. Spectrum Lab. Montana State University Bozeman MT 59717-3510 Optoelectronic Computing Systems Center Department of Electrical and Computer Engineering University of Colorado at Boulder Boulder CO 80309-0425

A microwave spectrum analyzer capable of capturing multi-GHz spectra with sub-MHz resolution and unity probability of intercept based on optical spectral holebuming materials is proposed and initial demonstrations pre... 详细信息

关键词： Spectrum analysis

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A comparative study of the suitability of a custom computing machine and a VLIW DSP for use in 3G applications

A comparative study of the suitability of a custom computing...

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IEEE Workshop on Signal Processing Systems (SIPS)

作者： J. Neel S. Srikanteswara J.H. Reed P.M. Athanas Mobile and Portable Radio Research Group Bradley Department of Electrical and Computer Engineering Virginia Technology USA Configurable Computing Lab Bradley Department of Electrical and Computer Engineering Virginia Technology USA

As wireless communications advances, the complexity of waveform processing places an ever increasing demand on baseband processing resources. As this is a difficult problem for traditional processing solutions to address, many have looked to reconfigurable computing as a solution. For 3G systems, whose intense processing requirements exacerbate these problems, we have previously proposed in (S. Srikanteswara et al, Soft Radio Impl. for 3G and Future High Data Rate Syst., Globecom 2001) the use of custom computing machines (CCMs), also known as adaptive computing machines (ACMs). This paper introduces a method for measuring processor performance which is independent of chip architecture. This method is then used to perform a comparative analysis on the suitability of Virginia Tech's Stallion CCM and Texas, Instrument's TMS320C6201 processor for use in 3G applications.

关键词： VLIW Digital signal processing computer architecture Application software Semiconductor device measurement Field programmable gate arrays Hardware Software radio Baseband Analog integrated circuits

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SCI networking for shared-memory computing in UPC: blueprints of the GASNet SCI conduit

SCI networking for shared-memory computing in UPC: blueprint...

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Conference on Local computer Networks (LCN)

作者： H. Su B. Gordon S. Oral A. George High-performance Computing and Simulation (HCS) Research Lab Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

Unified Parallel C (UPC) is a programming model for shared-memory parallel computing on shared- and distributed-memory systems. The Berkeley UPC software, which operates on top of their Global Addressing Space Networking (GASNet) communication system, is a portable, high-performance implementation of UPC for large-scale clusters. The Scalable Coherent Interface (SCI), a torus-based system-area network (SAN), is known for its ability to provide very low latency transfers as well as its direct support for both shared-memory and message-passing communications. High-speed clusters constructed around SCI promise to he a potent platform for large-scale UPC applications. This work introduces the design of the core API for the new SCI conduit for GASNet and UPC, which is based on active messages (AM). Latency and bandwidth data were collected and are compared with raw SCI results and with other existing GASNet conduits. The outcome shows that the new GASNet SCI conduit is able to provide promising performance in support of UPC applications.

关键词： computer networks Intelligent networks ISO standards Concurrent computing Delay Distributed computing Parallel programming Parallel processing Large-scale systems Programming profession

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Experimental characterization of QoS in commercial Ethernet switches for statistically bounded latency in aircraft networks

Experimental characterization of QoS in commercial Ethernet ...

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Conference on Local computer Networks (LCN)

作者： A. Jacobs J. Wernicke S. Oral B. Gordon A. George High-performance Computing and Simulation (HCS) Research Lab Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

Aircraft networks are used to service mission-critical avionics systems as well as cabin systems such as in-flight entertainment. These networks require that the switches used offer line-rate switching as well as bounded latency and jitter. Gigabit Ethernet offers an interesting replacement to traditional proprietary networks because of its high performance and low cost. We develop a framework for analyzing the abilities of Gigabit Ethernet switches to provide probabilistic guarantees for reliably low latency using quality of service (QoS) controls. From the perspective of control capabilities, management complexity, and implementation success we compare the strengths and weaknesses of three modern Ethernet switches. These switches exhibit a broad range of configuration options and are representative of the different levels of QoS implementation available today. We use the performance metrics of latency, jitter, and packet loss to characterize the success of a service policy. The results from a variety of network, load, and traffic scenarios are presented in terms of these metrics. Through the results, we are able to gain insight into the individual switch implementations of QoS.

关键词： Ethernet networks Switches Delay Aircraft Quality of service Aerospace electronics Jitter Mission critical systems Costs Measurement

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Simulative analysis of the RapidIO embedded interconnect architecture for real-time, network-intensive applications

Simulative analysis of the RapidIO embedded interconnect arc...

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Conference on Local computer Networks (LCN)

作者： D. Bueno A. Leko C. Conger I. Troxel A.D. George High-performance Computing and Simulation (HCS) Research Lab Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

RapidIO is an emerging standard for switched interconnection of processors and boards in embedded systems. We use discrete-event simulation to evaluate and prototype RapidIO-based systems with respect to their performance in an environment targeted towards space-based radar applications. This application class makes an ideal test case for a RapidIO feasibility study due to high system throughput requirements and real-time processing constraints. Our results show that a baseline RapidIO system is well suited to space-based radar, providing significant improvements over typical bus-based architectures. Our results also show that extensions to the RapidIO protocol such as cut-through routing and transmitter-controlled flow-control would provide minimal performance improvements for the applications under study.

关键词： Analytical models Embedded system Discrete event simulation Virtual prototyping Radar applications System testing Throughput Real time systems Spaceborne radar Routing protocols

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Access delay analysis in reservation multiple access protocols for broadband local and cellular network

Access delay analysis in reservation multiple access protoco...

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Conference on Local computer Networks (LCN)

作者： A. Doha H. Hassanein Telecommunications Research Lab Electrical and Computer Engineering Department Queen's University Canada Telecommunications Research Lab School of Computing Queen's University Canada

This work analyzes reservation request access delay in reservation multiple access protocols in light of frame contention slot allocation. Variations of the reservation MAC protocol are widely used in local and cellular network technologies. We derive an analytical model for access delay of reservation request packets that reflects the impact of per-frame number of contention slots on access delay of a request packet. We obtain insightful observations on this relation and as a result show that a new family of delay and throughput constrained dynamic contention slot allocation schemes can be developed.

关键词： Intelligent networks Access protocols Land mobile radio cellular systems Media Access Protocol Delay Scheduling computer networks Frequency conversion Telecommunication computing Downlink

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