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Fade Dynamic Characteristics on Olympus 12.5 GHz Link

Fade Dynamic Characteristics on Olympus 12.5 GHz Link

引用

European Conference on Microwave

作者： Francesco Barbaliscia Renzo Perfetti Fondazione Ugo Bordoni Rome Italy

First data from the propagation experiments with the Olympus satellite have been analyzed at 12.5 GHz in Rome for a 18 months period, on an event basis. The dynamic characteristics of the attenuation due to rain are examined to extract the design figures for those communication systems making use of allocation of countermeasures on a dynamic basis. A suitable preprocessing of attenuation data has been performed. The correlation of both the slope and the duration of fade events with the attenuation level have been analyzed, giving useful results for fade-countermeasure applications.

关键词： Attenuation Satellites Information filtering Information filters Data mining Rain fading Real time systems Earth Frequency diversity adaptive coding

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An adaptive fast multiple reference frames selection algorithm for H.264/AVC

An adaptive fast multiple reference frames selection algorit...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Peng Wu Chuang-Bai Xiao College of Computer Science and Technology Beijing University of Technology Beijing China

To make full use of the temporal correlation of video sequences, H.264/AVC adopts multiple reference frames to enhance the coding quality. While the performance being improved, the complexity of computation has been increased linearly, too. In this paper, we study motion characteristic of video sequences and spatial correlation in video frames first, and then we propose an adaptive fast multiple reference frames selection algorithm. It can decrease the number of reference frames for motion compensation, and reduce the complexity of coding adaptively according to the features of video sequences. The results show that our algorithm achieves 45% coding time saving on average with unnoticeable quality loss.

关键词： Automatic voltage control Video sequences Motion compensation PSNR IEC standards ISO standards Motion estimation Educational institutions Computer science adaptive coding

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Advanced Physical and MAC Layer Techniques for DVB-based Interactive Satellite Terminals

Advanced Physical and MAC Layer Techniques for DVB-based Int...

引用

The Institution of Engineering and Technology Seminar on Digital Video Broadcasting Over Satellite: Present and Future

作者： A. Ginesi R. Rinaldo R. De Gaudenzi O. Del Rio ESTEC Noordwijk Netherlands

ISBN: (纸本)9780863417306;0863417302

This paper presents some enhanced techniques that can be successfully applied to the return link of interactive satellite terminals with some estimated performance gains. In particular the following techniques are presented: i) an enhanced forward error correction (FEC) scheme with improved performance with respect to the current turbo code, ii) a novel framing and layer 2 encapsulation scheme optimized for adaptive physical layer and matching traffic characteristics, iii) high order modulation schemes (i.e. 8PSK and possibly 16APSK) with adaptive coding and modulation and a variety of code rates; iv) optimized contention-based access

关键词： Satellite terminals return channel satellites user terminal DVB-S2 adaptive coding Physical layer End users MAC layer Entertainment services Interactive DVB-S 8-PSK broadband

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adaptive code acquisition using a GO-CFAR processor in DS/CDMA systems

Adaptive code acquisition using a GO-CFAR processor in DS/CD...

引用

IEEE Region 10 International Conference TENCON

作者： Hong Gil Kim Iickho Song Sun Yong Kim Jung Hoon Lee Suk Chan Kim Department of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon South Korea Department of Electronics Engineering Hallym University Chuncheon Kangwon South Korea

We propose to use a greatest of (GO) CFAR processor for PN code acquisition in DS/CDMA systems. We compare the single-dwell scheme without the verification mode using the GO CFAR processor with that using the cell averaging (CA) and order statistics (OS) CFAR processors. From the simulation results, we can observe that the DS/CDMA systems with the GO CFAR processor has better performance than those with the CA and OS CFAR processors at abrupt change of the variance.

关键词： adaptive coding Multiaccess communication Additive white noise Gaussian noise Signal to noise ratio Detectors Interference Radar detection AWGN Noise generators

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adaptive color image compression based on visual attention

Adaptive color image compression based on visual attention

引用

International Conference on Image Analysis and Processing

作者： N. Ouerhani J. Bracamonte H. Hugli M. Ansorge F. Pellandini Institute of Microtechnology University of Neuchâtel Neuchatel Switzerland

This paper reports an adaptive still color image compression method which produces automatically selected ROI with a higher reconstruction quality with respect to the rest of the input image. The ROI are generated on-the fly with a purely data-driven technique based on visual attention. Inspired from biological vision, the multicue visual attention algorithm detects the most visually salient regions of an image. Thus, when operating in systems with low bit rate constraints, the adaptive coding scheme favors the allocation of a higher number of bits to those image regions that are more conspicuous to the human visual system. The compressed image files produced by this adaptive method are fully compatible with the JPEG standard, which favors their widespread utilization.

关键词： Color Image coding Layout Humans Computational modeling Biological system modeling Feature extraction Image reconstruction adaptive coding Visual system

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From Gigabit to Multi-Gigabit: mm Waves in Mobile Networks' Backhaul

From Gigabit to Multi-Gigabit: mm Waves in Mobile Networks' ...

引用

IEEE Globecom Workshops

作者： Istvan Frigyes Laszlo Csurgai-Horvath Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In recent years mm-wave point-to-point radios appeared among wireless equipment. The large available bandwidth in principle up to 10 GHz - the sparse utilization of the frequency band and efficient spatial filtering make them very advantageous for the backhaul of cellular networks. Present day equipment transmit 1 Gbit/sec over paths of several, about 1 to 3 km-s. The aim of this paper is to briefly present features and applications of these equipments and to discuss development possibilities. Concerning the increase of hop length the already used technique of rate adaptation is analyzed and two diversity techniques are presented. About increase of transmission rate up to 10 Gbit/sec it is shown that simply rescaling the methods used in actual systems is virtually non-viable and more sophisticated methods are needed. Two techniques are proposed and investigated, (i) Spatial demultiplexing of channels is presented; conditions of application are shown, (ii) Possibilities offered by adaptive coding are investigated.

关键词： Bandwidth Bit rate Frequency Land mobile radio cellular systems Urban areas Optical fiber devices Next generation networking Filtering Demultiplexing adaptive coding

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Design and implementation of the 155 Mbps adaptive modem for broadband satellite communications

Design and implementation of the 155 Mbps adaptive modem for...

引用

International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Eun-A Choi Dae-Ig Chang Nae-Soo Kim Broadband Wireless Communication Research Department Radio & Broadcasting Research Laboratory ETRI Daejeon South Korea

ISBN: (纸本)0780374428

We present the design and implementation of a 155 Mbps satellite modem adaptively compensated against rain attenuation. In order to compensate rain attenuation over a high-speed satellite link, adaptive coding schemes with variable coding rates and pragmatic TCM, that can decode both QPSK and TC-8PSK using the same Viterbi decoder, are studied and analyzed. The pragmatic TCM with rate 2/3, selected as the optimal parameters for implementation, is modeled by VHDL. The key design issues are how to achieve a high data rate and how to integrate into a single ASIC chip various functions such as different data rates, scrambler/descrambler, interleaver, encoder/decoder, and BPSK/QPSK/8PSK modulator/demodulator. The implemented 155 Mbps adaptive modem has simplified interface circuits among the many functional blocks, and parallel processing architecture to achieve the high data rate. This 155 Mbps adaptive modem was designed and implemented by a single ASIC chip with the 0.25 /spl mu/m CMOS standard cell technology.

关键词： Modems Broadband communication Satellite communication Decoding Rain Attenuation Quadrature phase shift keying Application specific integrated circuits CMOS technology adaptive coding

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Estimation of the performance of link adaptation in mobile radio

Estimation of the performance of link adaptation in mobile r...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： J. Dunlop J. Irvine P. Cosimini Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK University of Strathclyde Glasgow Glasgow GB Dept. of Electron. & Electr. Eng. Strathclyde Univ. Glasgow UK

The paper is concerned with the performance of a packet based radio access mechanism for the third generation mobile employing link adaptation. The work has been carried out as part of the European RACE R2084 advanced time division multiple access system (ATDMA). Within the project considerable attention has been given to the incorporation of adaptive features for efficient use of radio spectrum.

关键词： Land mobile radio Robustness Time division multiple access adaptive coding Resource management Power control Testing Channel coding Error correction codes Programmable control

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adaptive code rate for orthogonal code hopping multiplexing (OCHM) in synchronous downlink

Adaptive code rate for orthogonal code hopping multiplexing ...

引用

IEEE Conference on Wireless Communications and Networking

作者： Jae Kyun Kwon Suwon Park Dan Keun Sung Heesoo Lee Department of EECS Korea Advanced Institute of Science and Technology Daejeon South Korea Telecommunications Research and Development Center Samsung Electronics Company Limited Suwon Gyeonggi South Korea Mobile Telecommunication Research Laboratory Electronics and Telecommunications Research Institute Daejeon South Korea

We proposed an Orthogonal Code Hopping Multiplexing (OCHM) scheme as a new statistical multiplexing scheme in synchronous downlink. OCHM enables a large number of users to share a limited number of code channels through statistical multiplexing. In this paper, we obtain the optimal code rate in several traffic load environments by simulation and summarize the appropriate traffic load region for each code rate as the optimal code rate. An adaptive code rate control scheme is proposed and the base station adaptively changes the code rate according to traffic environments in order to save power.

关键词： adaptive coding Downlink OFDM Telecommunication traffic Information rates Degradation Code division multiplexing Error analysis Collision mitigation Automatic control

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SAT01-4: A Study of Fairness Issues in the Assignment of Bandwidth to Elephant TCP Connections Sharing a Rain-Faded GEO Satellite Channel

SAT01-4: A Study of Fairness Issues in the Assignment of Ban...

引用

IEEE Globecom 2006

作者： Nedo Celandroni Franco Davoli Erina Ferro Alberto Gotta Areadella Ricercadel C.N.R. ISTI-CNR Pisa Italy University of Genoa Research Unit Genoa Italy

The goodput of long-lived TCP connections can be maximized in error-prone channels by trading bandwidth for Bit Error Rate (BER). This fact can be exploited in the bandwidth and transmission parameters' assignment, by means of adaptive coding and Modulation (ACM), in satellite systems; in such a case, multiple source- destination (SD) pairs actually "see" channels with diverse characteristics, owing to unequal weather conditions. However, when dealing with multiple SD assignments, both aspects of goodput-maximization and fairness must be dealt with. Improving the effectiveness of TCP may be relatively easy, but maintaining the effectiveness while maintaining the fairness is a challenge. The paper numerically analyzes the fairness behavior of two bandwidth allocation methods to TCP connections, experiencing diverse fading conditions.

关键词： Bandwidth Bit error rate Satellite broadcasting Forward error correction Fading Channel allocation Physical layer adaptive coding Modulation coding Satellite ground stations

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