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A Highly Efficient Receiver for Satellite-Based Automatic Identification System signal Detection 7

A Highly Efficient Receiver for Satellite-Based Automatic Id...

7th advanced Satellite Multimedia Systems conference / 13th signal processing for Space Communications Workshop (ASMS/SPSC)

作者： Colavolpe, Giulio Foggi, Tommaso Ugolini, Alessandro Lizarraga, Juan Cioni, Stefano Ginesi, Alberto Univ Parma DII I-43124 Parma Italy CNIT Res Unit Parma I-43124 Parma Italy ESA ESTEC Noordwijk Netherlands

ISBN: (纸本)9781479958931

An innovative receiver architecture for the satellite-based Automatic Identification System (AIS) has been recently proposed. In this paper, we describe a few modifications that can be introduced on the algorithms for synchronization and detection, that provide an impressive performance improvement with respect to the previous system. The receiver architecture has been designed for an on-board implementation, and for this reason all algorithms have been realized keeping the complexity as low as possible. A prototype for the proposed receiver has been implemented by the University of Parma and CGS S.p.A. Compagnia Generale per 10 Spazio under the ESA project FENICE.

关键词： Approximation methods Equations Interference Mathematical model Receivers Receivers Approximation method Mathematical Model automated identification system performance boost interference signal acquisition

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Session MP3 advanced signal processing algorithms

Session MP3 Advanced Signal Processing Algorithms

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Asilomar conference on signals, Systems & Computers

Start of the above-titled section of the conference proceedings record.

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Towards real time implementation of reconstructive signal processing algorithms using systolic arrays coprocessors

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JOURNAL OF SYSTEMS ARCHITECTURE 2010年第8期56卷 327-339页

作者： Castillo-Atoche, A. Torres-Roman, D. Shkvarko, Y. Univ Autonoma Yucatan Merida Yuc Mexico CINVESTAV Ctr Invest Estudios Avanzados IPN Guadalajara Jalisco Mexico

Reconstructive signal processing algorithms encompass a broad spectrum of computational methods. Fortunately, most of the methods fall into the classes of the matrix algebraic calculations, convolution, or transform type algorithms. These algorithms possess common properties such as regularity, locality and recursiveness. Considering such general class of reconstructive signal processing (SP) techniques, in this paper we propose a new Hardware/Software (HW/SW) co-design paradigm for the implementation of reconstructive SP algorithms via efficient systolic arrays integrated as digital SP coprocessors units. In particular, the selected matrix-matrix and matrix-vector multiplication algorithms are implemented in a systolic computing fashion that meets the real time SP system requirements when employing the developed Hardware/Software Co-Design method oriented at the use of a Xilinx Field Programmable Gate Array (FPGA) XC4VSX35-10ff668. (C) 2010 Elsevier B.V. All rights reserved.

关键词： Systolic arrays Hardware/Software co-design FPGA

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Experimental Verification of Intermodulation Distortion Models for Multicarrier Satellite Systems

Experimental Verification of Intermodulation Distortion Mode...

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8th advanced Satellite Multimedia Systems conference (ASMS) / 14th signal processing for Space Communications Workshop (SPSC)

作者： Delamotte, Thomas Knopp, Andreas Munich Univ Bundeswehr Chair Signal Proc D-85579 Neubiberg Germany

ISBN: (纸本)9781509016822

Due to the development of high throughput satellites, the multicarrier mode operation of high power amplifiers in the satellite transponders is nowadays a growing trend. This tendency poses new challenges in the design of algorithms able to mitigate the impairments induced by the nonlinear behavior of such amplifiers. One of these challenges is the construction of an accurate low complexity model of the distorted signals. In this work, simplified Volterra based models of a multicarrier satellite transmission chain are considered, and their ability to precisely model intermodulation distortion at the output of a measurement testbed is assessed using a normalized mean squared error criterion. Using a faster-than-Nyquist signaling strategy for the modulation of the signal carriers, it is emphasized how parameters like the input power backoff, the carrier spacing and the symbol duration can influence the precision of the models.

关键词： Intermodulation distortion

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Link Adaptation in Mobile Satellite Links: Field Trials Results

Link Adaptation in Mobile Satellite Links: Field Trials Resu...

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8th advanced Satellite Multimedia Systems conference (ASMS) / 14th signal processing for Space Communications Workshop (SPSC)

作者： Tato, Anxo Mosquera, Carlos Gomez, Iago Univ Vigo Signal Theory & Commun Dept Vigo 36310 Spain Ctr Tecnol Telecomunicac Galicia Gradiant Edificio CITEXVILocal 14 Campus Univ Vigo Vigo 36310 Spain

ISBN: (纸本)9781509016822

We describe the experiment that was carried out to communicate a Mobile Platform and a Ground Station through a Medium Earth Orbit (MEO) satellite. The physical layer in both ends, based on the specifications of the Satellite Component of the Universal Mobile Telecommunications System (S-UMTS), was implemented using Software Defined Radio (SDR) technology. The Mobile Terminal was boarded in both an unmanned aerial vehicle (UAV) and a car for the field trials. The ultimate goal was to test the practical performance of different physical layer adaptive techniques in the return link, and evaluate the open loop signal to noise ratio (SNR) contribution to the link adaptation algorithms.

关键词： Antennas

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Balancing Closed and Open Loop CSI in Mobile Satellite Link Adaptation 7

Balancing Closed and Open Loop CSI in Mobile Satellite Link ...

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7th advanced Satellite Multimedia Systems conference / 13th signal processing for Space Communications Workshop (ASMS/SPSC)

作者： Rico-Alvarinio, Alberto Arnau, Jesus Mosquera, Carlos Univ Vigo Signal Theory & Commun Dept Galicia Spain

ISBN: (纸本)9781479958931

We consider the problem of modulation and coding scheme selection in the return link of a mobile satellite system. We propose to use a weighted combination of both open loop and closed loop signal quality indicators to perform this selection. The combination weights are not selected by making any assumptions on the channel distribution;instead, they are dynamically adapted according to the ACK/NAK exchange between both ends. This adaptation procedure is obtained as a stochastic programming solution to an optimization problem. Numerical results will show the good performance of the proposed method compared to previous algorithms, and its robustness to environment changes.

关键词： MCS selection link adaptation rate adaptation mobile satellite open loop stochastic programming

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Bipartite Index Coding Protocol 7

Bipartite Index Coding Protocol

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7th advanced Satellite Multimedia Systems conference / 13th signal processing for Space Communications Workshop (ASMS/SPSC)

作者： Muhammad, Muhammad Schwarz, Stefanie German Aerosp Ctr DLR Inst Commun & Nav Oberpfaffenhofen Germany

ISBN: (纸本)9781479958931

In literature, the capacity of the Broadcast Packet Erasure Channel (BPEC) with feedback was derived and protocols were proposed. Out of these protocols, only few can be put in practice, because of their limitations. Mainly, these techniques impose impractical feedback assumption, which requests the feedback to be at the end of each time-slot. In this work, a novel protocol for reliable unicast transmissions over lossy broadcast links is proposed. Our approach represents a variation on the index coding theme, with bursty feedback. A satellite scenario, with the user-downlinks modelled as BPEC, is considered. Each user is downloading a different file composed of a set of distinct packets. Resulting from the channel broadcast nature, unintended users may overhear their neighbours packets. Using the side information and a bipartite graph, to model the problem at hand, allow us to build only instantly-decodable linear combinations, which are decoded by bit-wise XOR operations. These retransmissions occur at the end of every transmission round instead of every time-slot, which is a very realistic assumption in terrestrial wireless, cellular or satellite networks. Our protocol can easily serve an arbitrary number of users. Numerical results show that using our proposed scheme, rates very close to the capacity of the BPEC with feedback can be achieved.

关键词： Bipartite graph Encoding Indexes Protocols Satellite broadcasting Satellites signal processing algorithms Bipartite graph protocols Satellite broadcasting signal processing algorithms satellites Feedback coding SATELLITE NETWORKS

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Modulation Classifier for signals Used in Satellite Communications

Modulation Classifier for Signals Used in Satellite Communic...

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5th advanced Satellite Multimedia Systems conference / 11th signal processing for Space Communications Workshop (ASMS/SPSC)

作者： Flohberger, Markus Gappmair, Wilfried Koudelka, Otto Graz Univ Technol Inst Commun Networks & Satellite Commun Graz Austria

ISBN: (纸本)9781424468331

For the design of intelligent receivers, the classification of modulation schemes becomes an increasingly important task. Interestingly, the numerous papers on this subject neglect algorithms for the classification of APSK signals, although these are recommended in the DVB-S2 standard. Therefore, a featurebased method for classification of modulation schemes typically used in satellite communications, i.e. PSK, QAM and APSK, is proposed. As features, fourth-and sixth-order cumulants of the input samples are employed in this context. The performance of the moderately complex algorithm is verified by several simulation scenarios.

关键词： APSK signal classification DVB-S2 standard feature-based method intelligent receivers modulation modulation classifier modulation schemes satellite communication satellite communications signal classification

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Time-frequency analysis of a motor-generator 6

Time-frequency analysis of a motor-generator

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conference on advanced signal processing algorithms, Architectures, and Implementations VI

作者： Rohrbaugh, R USN CTR SURFACE WARFAREADV SIGNAL PROC BRANCHBREMERTONWA 98314

Time-frequency methods are applied for bearing analysis of a motor-generator. We show that these methods reveal features that are not seen by traditional methods, such as the power spectrum. These features may be used... 详细信息

ISBN: (纸本)0819422347

关键词： Time-frequency analysis Modulation Amplitude modulation Manufacturing Analytical research Corrosion Data modeling Quantum wells signal processing Warfare

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Mixed-radix approach to incremental DFT refinement

Mixed-radix approach to incremental DFT refinement

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conference on advanced signal processing algorithms

作者： WINOGRAD, JM NAWAB, SH BOSTON UNIV DEPT ECSBOSTONMA 02215

ISBN: (纸本)0819419222

Incremental refinement algorithms can quickly produce approximate results and may then improve the quality of those results in subsequent stages of computation. They offer promise for the development of real-time systems whose performance degrades gracefully under diminishing hard deadlines. We present a new class of incremental refinement algorithms which employ mixed-radix signal representations for the calculation of successive approximations to the DFT. This class includes algorithms with a wide range of cost/quality tradeoff characteristics. This work generalized a previously reported class of algorithms which employ binary signal representations only. The mixed-radix formulation allows solutions of a given level of quality to be achieved using significantly fewer arithmetic operations in many instances. Under certain restrictions, these algorithms can also be implemented with no computational overhead using fixed-point binary hardware.

关键词： APPROXIMATE processing INCREMENTAL REFINEMENT algorithms SUCCESSIVE APPROXIMATIONS DISCRETE FOURIER TRANSFORM SHORT-TIME FOURIER TRANSFORM MIXED-RADIX NUMBERING SYSTEMS REAL-TIME SYSTEMS

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