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检索条件"主题词=modulation coding"

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Hybrid DS/SFH spread-spectrum multiple-access communications over nonselective fading channels

Hybrid DS/SFH spread-spectrum multiple-access communications...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Sang Kyu Park Jin Tae Kim Department of Electronic Communication Engineering Hanyang University South Korea Hyundai Electronics Limited South Korea

ISBN: (纸本)0780319273

The performance of asynchronous hybrid direct-sequence/slow-frequency-hopped spread-spectrum multiple-access systems over nonselective Rayleigh fading channels is analyzed. We consider binary phase shift keying modulation with coherent demodulation, random spreading code sequences and hopping patterns. As a receiver model, both hard limiting correlation receiver and linear correlation receiver are considered. Bit error probabilities of the systems with/without near-far effect are obtained using a Gaussian interference approximation. The results show that hard limiting receivers are superior to linear correlation receivers over nonselective Rayleigh fading channel.< >

关键词： Spread spectrum communication Fading Frequency AWGN Binary phase shift keying modulation coding Demodulation Jamming Interference Niobium

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Outage simulations for digital microwave radio systems with trellis-coded modulation

Outage simulations for digital microwave radio systems with ...

引用

IEEE International Conference on Communications (ICC)

作者： C.J. Carlisle W.K. Kennedy M. Shafi Department of Electrical and Electronic Engineering University of Canterbury New Zealand Telecom Corporation of New Zealand Limited New Zealand

Recent studies have shown that trellis-coded modulation can achieve coding gains in the residual intersymbol interference environment that exists after adaptive equalization on terrestrial digital microwave radio (DMR) systems. Simulated system signatures for 140 Mb/s DMR systems incorporating trellis-coded 512-QAM modulation are presented and the results compared to the system signatures of equivalent uncoded 256-QAM systems. At a threshold bit-error rate (BER) of 10/sup -3/, the signature of the uncoded system can be degraded by the addition of coding. However, at a threshold BER of 10/sup -4/, it is found that trellis coding improves the system signature. Conditional probabilities of outage and the percentage of error-free seconds are also calculated for the coded and uncoded systems.< >

关键词： Digital modulation Decoding Intersymbol interference Convolutional codes Convolution Bit error rate Fading Feedback modulation coding Probability

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Manoeuvring flight control

Manoeuvring flight control

引用

American Control Conference (ACC)

作者： M. Pachter P.R. Chandler L. Smith Department of Electrical & Computer Engineering Air Force Institute of Technology OH USA Wright Laboratory WL/FIGC OH USA

The development of control laws for manoeuvring flight, specifically, a high amplitude velocity vector roll is addressed. The plant model has seventh order nonlinear dynamics with coupled pitch and lateral directional dynamics. Using time scale separation and pointwise linearization, a receding horizon linear quadratic optimal control law with full state feedback is synthesized online. Also online, the pilot inputs are modulated using linear programming to prevent actuator rate saturation over the optimization horizon. The nonlinear control law performance is demonstrated in a fighter aircraft simulation with a rudder failure during a loaded roll manoeuvre.

关键词： Aerospace control Velocity control Vectors Couplings Optimal control State feedback modulation coding Linear programming Hydraulic actuators Aircraft

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Performance evaluation of high level coded modulation over satellite channels

Performance evaluation of high level coded modulation over s...

引用

[Conference Record] GLOBECOM '92 - Communications for Global Users: IEEE

作者： P. Fines A.H. Aghvami Communications Research Group Department of Electrical and Electronic Engineering King''s College London UK

The performance of various coded and uncoded bandwidth efficient modulation schemes capable of providing bandwidth efficiency of 2 b/s/Hz over satellite links, is studied. The schemes are: Gray-coded 8-PSK (phase-shift keying), uncoded 8-AMPM, uncoded pi /2 8-AMPM, trellis-coded modulation (TCM) 16-QAM (quadrature-amplitude modulation), pi /4 TCM 16-QAM, and TCM 16-PSK, all bandlimited with roll-off factor alpha =0.5. The satellite high-power traveling wave tube amplifier (TWTA) is assumed to incorporate a soft-limiter-type linearizer in order to obtain the best possible bit error rate (BER) and minimum out of band emission (OBE). Performance, obtained by computer simulation, is expressed as the total carrier-to-noise (CNR) loss for a given BER, which is the sum of the CNR degradation due to the nonlinearities and high-power amplifier backoff. The performances of the various schemes are compared.< >

关键词： modulation coding Bit error rate Bandwidth Satellites Phase modulation High power amplifiers Phase shift keying Performance loss Computer simulation Degradation

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Clinical comparison of pulse and chirp excitation

Clinical comparison of pulse and chirp excitation

引用

IEEE Symposium (IUS) Ultrasonics

作者： M.H. Pedersen T.X. Misaridis J.A. Jensen Department of Ultrasound Herlev Hospital University of Copenhagen Herlev Denmark Center for Fast Ultrasound Imaging Technical University of Denmark Kongens Lyngby Denmark E.S.P.C.I. Laboratoire Ondes et Acoustique Paris France

Coded excitation (CE) using frequency modulated signals (chirps) combined with modified matched filtering has earlier been presented showing promising results in simulations and in-vitro. In this study an experimental ultrasound system is evaluated in a clinical setting, where image sequences are assessed by skilled medical doctors. The effect on penetration depth and image quality were measured. A modified clinical scanner with a 4 MHz single element mechanical transducer, and external transmitter and receiver boards (RASMUS system) were used. The system allowed rapid toggling between chirp and short pulse excitation to simultaneously produce identical image sequences using both techniques. Nine healthy male volunteers were scanned in abdominal locations. All sequences were evaluated by 3 skilled medical doctors, blinded to each other and to the technique used. They assessed the depth (1) in which image quality decreased and (2) in which the image would be insufficient for clinical diagnosis. Furthermore they compared image quality in matching pairs of conventional and CE images. The average increase in penetration depth were almost 2 cm. Side-by-side comparison showed that coded image quality was consistently rated better; significant (p/spl les/0.05) when images were cropped at minimum the depth for good image quality and highly significant (p<0.001) when cropped at maximum depth sufficient for clinical diagnosis. We conclude that coded excitation with linear FM chirps improves penetration and image quality significantly in a clinical setting.

关键词： Image quality Frequency modulation Image sequences Biomedical imaging Medical diagnostic imaging Clinical diagnosis Chirp modulation modulation coding Matched filters Filtering

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Reduced complexity turbo detection for coded DS-CDMA systems employing BPSK modulations

Reduced complexity turbo detection for coded DS-CDMA systems...

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

作者： M.A. Ouameur D. Massicotte Department of Electrical and Computer Engineering Université du Québec à Trois Rivières Trois-Rivieres QUE Canada

In this paper, a reduced complexity turbo detection receiver for coded DS-CDMA signals employing the BPSK modulation technique is presented. The new scheme is based on a new family of MMSE filter whose coefficients are thought to be the solution of a (forced) real valued cost function in the bit rather than a complex one as in conventional MMSE receivers. The new receiver provides, on average, 2 dB gain with less number of iterations. Simulation results for performance evaluation are conducted under the most interesting scenarios including asynchronous multipath channels, time varying channels and multirate systems.

关键词： Multiaccess communication Binary phase shift keying modulation coding Convolutional codes Convolution Detectors Multipath channels Filters Cost function Iterative decoding

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Performance Analysis of a Semi-fixed Mapping Scheme for VoIP Services in Wireless OFDMA Systems

Performance Analysis of a Semi-fixed Mapping Scheme for VoIP...

引用

International Conference on Wireless and Mobile Communications (ICWMC)

作者： Jaewoo So Department of Electronic Engineering Sogang University Seoul South Korea

Informing users about new resource assignments has to be broadcast, thus generating a substantial amount of the mapping overhead that influences the system throughput. In particular, the performance of voice-over-Internet protocol (VoIP) services is seriously affected by the mapping overhead because the VoIP packet size is small. In order to reduce the mapping overhead, a semi-fixed mapping scheme based on the periodicity of VoIP traffic was introduced. However, up to now, the detailed operation and the analysis of the semi-fixed mapping scheme have not been studied. This paper develops analytical and simulation models and evaluates the performance of a semi-fixed mapping scheme for VoIP services in wireless orthogonal frequency division multiple access systems.

关键词： Performance analysis Traffic control Analytical models Resource management Media Access Protocol Broadcasting Frequency conversion modulation coding Downlink Wireless communication

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Design of statistically based buffer control policies for compressed digital video

Design of statistically based buffer control policies for co...

引用

IEEE International Conference on Communications (ICC)

作者： J. Zdepski D. Raychaudhuri K. Joseph David Samoff Research Center Inc. Princeton NJ USA

The authors present an investigation of statistically based approaches to the design of buffer-control algorithms for interfacing a compressed digital video source to a constant rate channel. Since compression techniques such as DPCM (differential pulse code modulation) or transform coding result in variable bit rate encoded video, rate buffering and adaptive encoding are often used to maintain high average image quality, while avoiding buffer overflow events. As the first step to a quantitative methodology for the design and evaluation of adaptive buffer-control algorithms, an example adaptive-spatio-temporal/DPCM source is statistically characterized in terms of long-term rate distributions for each potential encoding mode (which are useful for general mode selection), along with more detailed intermode and intramode rate statistics (which provide useful information for mode switching). Two specific adaptive mode control algorithms based on these statistical characterizations are proposed: (a) the expected rate policy line algorithm, driven by conditional intermode expectation statistics, and (b) the constant overflow probability algorithm driven by conditional intramode distributions. Simulation results comparing the proposed algorithms with a conventional buffer level based control heuristic are presented, demonstrating the potential for substantial performance improvement at the expense of only a modest increase in encoder complexity.< >

关键词： Image coding Algorithm design and analysis Video compression Pulse modulation Statistical distributions Pulse compression methods modulation coding Transform coding Bit rate Image quality

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Performance assessment of tandem connection of enhanced cellular coders

Performance assessment of tandem connection of enhanced cell...

引用

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

作者： S.F. Campos Neto F.L. Corcoran A. Karahisar Lucent Technologies Bell Laboratories Innovations Clarksburg MD USA Teleglobe International Montreal Canada

The growth and increased competition in the second-generation (digital) cellular communication market has led service providers to improve the speech quality in their systems by introducing enhanced speech coders. Advancements in speech coding allowed designers to aim at toll-quality for these enhanced coders, and investigation of the impact of speech coders on the end-to-end quality of the public switched telephone network (PSTN) is necessary. This paper presents the continuation of a series of studies on the impact of tandem connection of cellular systems, where the quality of the enhanced cellular coders for major systems in use today is studied in the context of PSTN interconnection. A major conclusion of this study is that deployment of enhanced coders in second-generation cellular systems makes possible a substantial increase in quality of the cellular connections when in tandem with other speech coders in long haul international networks.

关键词： Speech enhancement Cellular networks Multiaccess communication Pulse modulation Speech coding Time division multiple access Circuits modulation coding Bit rate Testing

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SCM-Based Retransmission Scheme in Multi-Hop Relay Networks

SCM-Based Retransmission Scheme in Multi-Hop Relay Networks

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jiming Chen Shan Jin Research & Innovation Center Alcatel Shanghai Bell Corporation Limited Shanghai China

Recently, there has been an upsurge of interest in multi-hop relay in both academia and industry. By breaking a long-distance low-quality link into two or more high-quality segments, multi-hop relay is introduced to enable traffic/signaling forwarding between base station and mobile user with the benefits of throughput enhancement and coverage extension. In this paper, we propose a novel retransmission method, named SCM-based retransmission scheme, which is designed to take advantage of the multi-hop nature of the cellular network. Practically, we show that the proposed scheme improves performance with respect to its current solutions in terms of throughput, and cell latency.

关键词： Spread spectrum communication Relays Throughput Delay modulation coding Technological innovation Telecommunication traffic Decoding Downlink Base stations

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