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Highlights of signal processing for communications

IEEE SIGNAL PROCESSING MAGAZINE 1999年第2期16卷 14-50页

作者： Giannakis, GB Univ Minnesota Minneapolis MN 55455 USA

The celebration and highlights of 50 years of signal processing technology as it is applied to communication systems are presented. Some of the numerous opportunities this exciting area opens up for signal processing research and development are discussed. This celebration came at a time when a dramatic upswing in modern telecommunications worldwide is witnessed.

关键词： Signal processing modulation coding Sensor arrays Channel estimation Broadband antennas Antenna arrays Interference suppression Hardware Signal resolution Transform coding

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Complexity of a software GSM base station

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IEEE COMMUNICATIONS MAGAZINE 1999年第2期37卷 113-117页

作者： Turletti, T Tennenhouse, D INRIA High Speed Networking Res Grp Sophia Antipolis France MIT Comp Sci Lab Cambridge MA 02139 USA MIT Alfred P Sloan Sch Management Cambridge MA 02139 USA

There is increasing interest in developing radio-based applications in software. The new architecture for implementing mobile telephony base stations has the potential of offering many benefits: great cost savings by using one transceiver per BTS instead of one per channel, tremendous flexibility by moving system-specific parameters to the digital part, and allowing the support of a wide range of modulation and coding schemes. A very important problem in designing software radio applications is the need to estimate the required complexity of processing to dimension systems. For example, with a software GSM BTS it is critical to estimate the number of channels that can be supported by a given processor configuration, and to predict the impact of future processor enhancements on its capacity. This article is a short version of one which appeared in the IEEE Journal on Selected Areas in Communications Special Issue on Software Radios [1]. It focuses on the design of a software implementation of a GSM BTS and proposes a platform-independent evaluation of its computational requirements based on SPEC benchmarks [2].

关键词： GSM Base stations Application software Transceivers Software design Computer architecture Telephony Digital modulation modulation coding Software radio

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Impact of channel-state information on coded transmission over fading channels with diversity reception

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IEEE TRANSACTIONS ON COMMUNICATIONS 1999年第9期47卷 1284-1287页

作者： Taricco, G Biglieri, EM Caire, G Politecn Torino Dipartimento Elettron I-10129 Turin Italy Eurecom Mobile Commun Grp F-06904 Sophia Antipolis France

We study the synergy between coded modulation and antenna-diversity reception on channels affected by slow Rician fading, Specifically, we assess the impact of channel-state information (CSI) on error probability. We show that with a good coding and constant envelope modulations (for example, phase-shift keying) scheme the loss in performance when CSI is not available is moderate (around 1.5 dB). Moreover, as the diversity order grows, the channel tends to become Gaussian.

关键词： Communication channels (information theory) Fading (radio) Antennas Probability Error analysis Diversity reception Channel-state information (CSI) Channel state information Error probability Fading channels modulation coding diversity reception

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Performance of coded modulation employing differential encoding over Rayleigh fading channels

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ELECTRONICS LETTERS 1999年第2期35卷 122-123页

作者： Fischer, RFH Calabrò, S Lampe, LHJ Müller-Weinfurtner, SH Univ Erlangen Nurnberg Lab Nachrichtentech D-91058 Erlangen Germany Univ Palermo Dipartimento Ingn Elettr Palermo Italy

Multilevel coding and bit-interleaved coded modulation employing differential encoding and non-coherent reception over flat fading channels are assessed. To achieve high bandwidth efliciencies mixed amplitude/phase modulation is performed. It is shown that multiple symbol detection only provides gains for multilevel coding as Gray labelling of the differential symbols is not possible.

关键词： Signal encoding Communication channels (information theory) Rayleigh fading Bandwidth Gray labelling Bit-interleaved coded modulation Raleigh fading channels Bandwidth differential coding Rayleigh fading Multilevel coding bandwidth efficiency Signal encoding modulation coding Bit interleaved coded modulation flat fading channel

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Polytime coding as a means of pulse compression

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IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 1999年第2期35卷 716-721页

作者： Fielding, JE Radian Int Austin TX 78720 USA

A set of code sequences is proposed for radar applications in which all phase steps are equal and the time duration of each phase state is varied in order to properly approximate either a stepped-RE waveform or a linear FM waveform, Since these proposed waveforms have varying time durations at each phase state, they are referred to as "Polytime" codes. Polytime code sequences have the advantage that arbitrary time-bandwidth waveforms can be generated with a few phase states. Of particular interest are cases where phase is quantized into two states (i.e., 0 degrees and 180 degrees).

关键词： modulation coding phase coding pulse compression radar signal processing sequential codes Doppler tolerance Polytime coding arbitrary time-bandwidth waveforms code sequences linear FM waveform phase quantization radar applications stepp Radar signal processing phase coding waveforms sequential codes Pulse compression STATE(PHASE) Radar applications coding Sequence modulation coding

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Performance comparison of ATSC 8-VSB and DVB-T COFDM transmission systems for Digital Television Terrestrial Broadcasting

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 1999年第3期45卷 916-924页

作者： Wu, YY Commun Res Ctr Canada Ottawa ON K2H 8S2 Canada

This paper compares the performances of ATSC 8-VSB and DVB-T COFDM transmission systems for Digital Television Terrestrial Broadcasting. The comparison is based on the most recent laboratory test results and theoretic... 详细信息

关键词： Digital video broadcasting Digital TV TV broadcasting Testing modulation coding Digital modulation AWGN Peak to average power ratio Laboratories Digital multimedia broadcasting

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An overview of UCSD's Center for Wireless Communications

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IEEE PERSONAL COMMUNICATIONS 1999年第5期6卷 8-16页

作者： Acampora, AS Univ Calif San Diego Ctr Wireless Commun San Diego CA 92103 USA

UCSD's Center for Wireless Communications was founded in March 1995 as a partnership between the University and the wireless communications industry. Its goals include the definition and pursuit of a cutting-edge program of precompetitive, multidisciplinary research focused on wireless access systems, technologies, and applications;the creation of a relevant base of new knowledge with high commercial impact potential;and the production of graduates at all degree levels trained to meet industrial human resources needs. Of paramount importance to the achievement of these goals are the involvement, collaboration, and financial support of the CWC's Industrial Participants. Working in close cooperation with its Industrial Participants, the theme of broadband wireless access to the Internet was chosen as the unifying focus for the Center's programs, and five thrust areas have been defined: circuits, signal processing (smart antennas and compression), communication theory, networks, and software to wirelessly support multimedia applications. Seven specific goal-oriented projects are currently underway, each intended to meet the long-term interests of a subset of our Industrial Participants. These seven projects focus, respectively, on ad hoc home networks, universal wide-area wireless service. space-time processing, modulation/coding for enhanced coverage, linear power amplifiers, RF receivers, and changes to the Internet infrastructure needed to support ubiquitous broadband wireless access. Among the many issues being addressed are agent-based computing, division of responsibilities between the tetherless information portal and the infrastructure-based agents, battery-conserving protocols for the air interface, quality of service at the wireless networking layer? capacity enhancement and interference suppression on the radio air interface, modulation and coding, image and video compression, and low-power RF and integrated circuits for the handheld device.

关键词： Wireless communication Communication industry IP networks Broadband antennas modulation coding Radio frequency Handheld computers Production systems Industrial training Humans

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Effect of channel coding in digital holographic data storage

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 1999年第7A期38卷 4105-4109页

作者： Liu, J Phua, CC Chong, TC Wu, YH Boopathi, V Data Storage Inst Singapore 119260 Singapore

A random array exclusive OR modulation (REOM) channel coding technique is proposed for digital holographic data storage. The effect of channel coding on the system performance is analyzed through simulations. The performance of REOM is compared with that of other coding methods in terms of system raw bit error rate (BER) and signal-to-noise ratio (SNR). It is shown that REOM provides relatively uniform intensity distribution on the recording plane and therefore gives an improved performance.

关键词： holographic data storage channel coding modulation coding Fourier transform hologram

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Butterfly structure in trellis-coded modulation

Butterfly structure in trellis-coded modulation

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： J.C. Dill Yung-C. Lo A.R. Lindsey Electrical Engineering & Computer Science Ohio University Athens OH USA US Air Force Research Laboratory Rome NY USA

Trellis coded modulation was designed to improve error performance of synchronous data links without sacrificing data rate, or expanding bandwidth. The codes are interpreted as binary convolutional codes with a mapping of coded bits into multilevel/phase signals to increase free Euclidean distance. The technique referred to as "mapping by set partitioning" is claimed as an optimal assignment. The rules for assigning channel signals first proposed by Ungerboeck assure maximum free Euclidean distance. However, by taking advantage of a butterfly structure in the trellis and modifying Ungerboeck's rules, the multiplicity of error events with free Euclidean distance can be minimized. In this paper, the relationship between butterfly and signal assignment is revealed and a modified rule is proposed for optimality of the trellis assignment.

关键词： Euclidean distance Convolutional codes Signal mapping System performance modulation coding Bandwidth Lattices Amplitude modulation Convolution Computer science

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Performance analysis of trellis coded M-PSK systems over Rician fading channels with phase jitter

Performance analysis of trellis coded M-PSK systems over Ric...

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IEEE Conference on Vehicular Technology (VTC)

作者： M. Uysal E. Panayirci U. Aygolu Faculty of Electrical and Electronics Engineering Istanbul Technical University Istanbul Turkey Department of Electronics Engineering ISIK University Istanbul Turkey Department of Electrical Engineering Texas A and M University College Station TX USA

In this paper, the performance of trellis coded M-PSK systems in the fading environment is investigated. The combined effects of the fading and the non-ideal coherent receiver on the phase of the received signal are taken into account. Thus, performance analysis results will reflect the degradations both due to the effects of the fading on the amplitude of the received signal and of a noisy carrier reference, each modeled by the Rician and Tikhonov distributions, respectively.

关键词： Performance analysis Rician channels Jitter Phase noise Convolutional codes Noise level modulation coding Satellites Convolution Additive noise

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