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检索条件"主题词=adaptive coding"

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Characterization of the resonant and coupling parameters of dielectric resonators of NRD-guide filtering devices

Characterization of the resonant and coupling parameters of ...

引用

Microwave, MTT-S International Symposium

作者： F. Frezza A. Galli G. Gerosa P. Lampariello Department of Electronic Engineering University of Roma La Sapienza Italy

The design of millimeter-wave filtering devices using dielectric resonators of various shapes in nonradiative dielectric (NRD) waveguides is considered. By developing different approximate and rigorous theoretical methods, the resonant and coupling properties (frequencies, field configuration, unloaded and loaded quality factors, scattering parameters, etc.) are modeled and implemented in an adaptive code. Experimental comparison through suitable measurements are performed to validate the theoretical and numerical results.< >

关键词： Resonance Dielectric devices Resonator filters Filtering Millimeter wave technology Shape Frequency Q factor Scattering parameters adaptive coding

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Meteor burst in the post 2000 era

Meteor burst in the post 2000 era

引用

MILCOM, Military Communications Conference

作者： C. Marriott V. Oduol A. Ghosh B. Tailor MPB Technol. Inc. Pointe Claire Que. Canada MPB Technologies Inc. Pointe Claire QUE Canada

In recent years a renewed interest has been shown in the possibility of using meteor burst links in tactical communications, both for networking and covert operations. Some of the applications that recent performance improvements would permit are evaluated. In evaluating the feasibility of a meteor burst implementation, certain technical and physical limitations are addressed. For the success of these applications, interoperability with other communication systems is necessary. The level of interoperability with other media, and the standards necessary to assure this interoperability are examined. Methods of minimizing and combating jamming are proposed. Meteor burst systems can be used in a large number of applications within a tactical environment. The principal disadvantage of the meteor burst medium is the problem of interference to other spectrum users from the probe end, and the interference from other users at the receiver end. The low throughput characteristic of meteor burst compares with some of the channel capacities used in other systems. Interoperability with other networks or communications links is relatively easy if certain straightforward protocols and standards are established.< >

关键词： Frequency Throughput Automatic repeat request Protocols Signal processing algorithms Communication systems adaptive coding Jamming Reflection Radio communication

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Optimal Opportunistic Multicast for Minimizing Broadcast Latency in Wireless Networks

Optimal Opportunistic Multicast for Minimizing Broadcast Lat...

引用

IEEE International Conference on Communications (ICC)

作者： W. Huang K. L. Yeung Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

In this paper, we study opportunistic multicast scheduling (OMS) in a wireless network with a central base station (BS) broadcasting a common packet to multiple users with different instantaneous channel conditions. Our objective is to minimize the broadcast latency, which is defined as the total transmission time required for all intended users in a multicast group to receive the packet. Based on the instantaneous channel conditions, BS can send a packet at different transmission rates. Sending at a higher rate allows a shorter packet transmission time, but only a limited number of users with sufficient channel quality can receive the packet. To reach all users in a multicast group, the packet must be transmitted multiple times. We can see that the broadcast latency depends on the transmission rate used and the number of transmissions required. In this paper, we formulate the problem of minimizing broadcast latency as a dynamic programming problem, and a close-loop optimal opportunistic multicast scheduling scheme (OOMS) is derived.

关键词： Broadcasting Delay Wireless networks Base stations Dynamic programming Dynamic scheduling adaptive coding Modulation coding Diversity methods Communications Society

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Backward adaptive Pre/Post-Filtered DPCM with Near-Optimal Rate-Distortion Performance

Backward Adaptive Pre/Post-Filtered DPCM with Near-Optimal R...

引用

IEEE International Conference on Communications (ICC)

作者： Y. Fan J. Wang J. Sun R. Xie Department of Electrical Engineering Shanghai Jiaotong University Shanghai China

In this paper, we propose two backward adaptive coding algorithms based on a recently invented pre/post-filtered DPCM (Differential Pulse-Coded Modulation) codec. The pre/post-filters and the predictor are adapted jointly. Source statistics are assumed unknown a priori. One of the algorithms is based on power spectrum estimation, and the other gradient descent. Some properties of the algorithms are analyzed. Experiment results show that both algorithms achieve near-optimal rate-distortion performance, significantly outperforming the adaptive DPCM without adaptive pre/post-filtering.

关键词： Rate-distortion Codecs Statistics Pulse modulation adaptive coding Algorithm design and analysis Decoding Communications Society Sun Modulation coding

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Hybrid test vector compression in system-on-chip test — An overview and methodology

Hybrid test vector compression in system-on-chip test — An ...

引用

International Conference on Computers and Devices for Communication (CODEC)

作者： Satyendra N. Biswas Sunil R. Das Emil M. Petriu Altaf Hossain Department of Electrical Engineering Technology Georgia Southern University Statesboro GA USA School of Information Technology and Engineering Faculty of Engineering University of Ottawa Ottawa ONT Canada Department of Computer and Information Science College of Arts and Sciences Troy University Montgomery AL USA

This paper presents a comprehensive study on a number of hybrid test vector compression methods for VLSI circuit testing. In the proposed approaches, a software program is loaded into the on-chip processor memory along with the compressed test data sets. To minimize on-chip storage besides testing time, the test data volume is first reduced by compaction in a hybrid manner before downloading into the processor. The methods utilize a set of adaptive coding techniques for realizing lossless compression. The compaction program need not be loaded into the embedded processor, as only the decompression of test data is required for the automatic test equipment. The developed schemes necessitate minimal hardware overhead, while the on-chip embedded processor can be reused for normal operation on completion of testing. As an extension of the earlier works, this paper also reports further results on studies of the problem and demonstrates the feasibility of the suggested methodologies with simulation results on ISCAS 85 combinational and ISCAS 89 full scan sequential benchmark circuits.

关键词： System testing System-on-a-chip Circuit testing Compaction Very large scale integration Software testing adaptive coding Automatic testing Automatic test equipment Hardware

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On the improvement of low elevation angle satellite communications impaired by tropospheric fading effects

On the improvement of low elevation angle satellite communic...

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MILCOM, Military Communications Conference

作者： J.C. Kim D.E. Schall System and Information Technology Group TRW Inc. Fairfax VA USA

Performance impairments occur on C- and Ku-band satellite communications links because of severe tropospheric fading effects when the elevation angle of the ground station is very low (<50). Two cases of satellite communications link impairment are discussed; the first is for data transmission from a high latitude ground station as found in NASA's Earth Orbiting Satellite (EOS) program. The second is for data transmission from LEO/MEO satellites at all latitudes. Experimental data shows that deep fading of satellite communications signals because of severe tropospheric absorption is as much as 27 dB during the worst summer month between a high latitude station and a geosynchronous satellite. With this amount of deep fading, if would be extremely difficult to transmit low-BER data during the summer months. The mitigation techniques proposed consist of: (a) adaptive coding by using a combination of the Reed-Solomon code, convolutional code, and interleaving, and (b), for lower orbit LEO satellites a shaped (depressed cardioid) antenna pattern. Using the same adaptive coding technique, the amount of contact time by ground stations at any latitude with LEO/MEO satellites could be increased substantially by enabling operation to very low elevation angles generally considered unusable. Using the shaped (depressed cardioid) antenna pattern, the received signal level could be maximized at very low elevation angles.

关键词： Satellite communication Satellite ground stations Fading Low earth orbit satellites Data communication Artificial satellites adaptive coding Cardiology Earth Observing System Absorption

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Noncoherent adaptive code acquisition scheme using a differential detection technique in DS/SS systems

Noncoherent adaptive code acquisition scheme using a differe...

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IEEE Conference on Vehicular Technology (VTC)

作者： Takki Yu Jonghyung Kwun Hyounggoo Jeon Daesik Hong Changeon Kang Information and Telecommunication Laboratory Department of electronics Yonsei University Seoul South Korea Department of information and Communications Engineering Dongeui University busan South Korea

A noncoherent adaptive code acquisition scheme is proposed by employing a differential detection technique. The carrier phase offset in the PN signal component of the filter input is removed by a differential detector. The numerical results for the detection and false alarm probabilities, and the mean acquisition time are derived. The performance of the proposed system is verified by simulations. The proposed system is compared with the conventional system using a matched filter by considering the mean acquisition time and the false alarm probability simultaneously. Simulation results show that the proposed system has a good performance under overall channel conditions, especially at low SNR, and outperforms the matched filter by 4-6 dB under an AWGN channel for 16 taps.

关键词： adaptive coding Detectors adaptive filters Phase detection Matched filters AWGN channels Signal generators Hardware Phase estimation Testing

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Delay Compensation Strategies for an Efficient Radio Resource Management in DVB-S2 Systems

Delay Compensation Strategies for an Efficient Radio Resourc...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： C.P. Niebla C. Kissling Institute of Communications and Navigation German Aerospace Center Wessling Germany

This paper deals with the design and evaluation of a complementary issue that supports efficient radio resource management strategies in DVB-S2 systems with adaptive coding and modulation: the selection of suitable modulation and coding schemes that maximize instantaneous channel efficiency for each receiver. The inherent delays in the considered satellite system causes that when the channel information is available at the gateway, it is outdated. For this reason, delay compensation techniques are proposed in this paper in order to optimize the selection of suitable physical layer configurations

关键词： Delay Resource management Digital video broadcasting Modulation coding Channel estimation Satellite broadcasting Low pass filters Physical layer Bit error rate adaptive coding

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adaptive code allocation in multicode-CDMA for transmitting H.263 video

Adaptive code allocation in multicode-CDMA for transmitting ...

引用

IEEE Conference on Wireless Communications and Networking

作者： B. Deep Wu-Chi Feng Computer & Information Science Ohio State Uinversity Columbus OH USA Ohio State University Columbus OH US

This paper proposes a new way to incorporate H.263 video into existing voice/data code-division multiple access (CDMA) networks using a multi-code access protocol. A channel allocation policy is proposed that "shares" codes for larger I-frame video transmission and allocates a fixed number of codes for P-frame transmissions. The base station in a given cell of a CDMA network controls this allocation method, but bandwidth access distribution is based on both mobile host requests and base station forced requests. This scheme allows more efficient allocation of resources in the bandwidth-limited wireless spectrum and improves the quality of service (QoS) of video traffic over this lossy environment.

关键词： adaptive coding Multiaccess communication Base stations Quality of service Access protocols Channel allocation Force control Bandwidth Resource management Communication system traffic control

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adaptive error control for hybrid (satellite-terrestrial) networks

Adaptive error control for hybrid (satellite-terrestrial) ne...

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IEEE Conference on Wireless Communications and Networking

作者： S. Cho Broadband and Wireless Networking Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

Hybrid satellite-terrestrial networks are becoming increasingly popular for asymmetric multimedia services such as file transfer and database services. This paper presents an adaptive error control (AEC) protocol for the hybrid network, in which the transmitter uses a combination of automatic repeat request (ARQ) over terrestrial links and forward error control (FEC) scheme with adaptive code rate over satellite links. Throughput performance shows that the proposed AEC protocol adapts to a time-variant satellite channel better than the static hybrid ARQ protocol under different satellite channel conditions.

关键词： Programmable control adaptive control Error correction Protocols Automatic repeat request Satellites Multimedia databases Transmitters Forward error correction adaptive coding

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