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检索条件"主题词=modulation coding"

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Robust method for optimal PWM harmonic elimination based on the Chebyshev functions

Robust method for optimal PWM harmonic elimination based on ...

引用

International Conference on Harmonics and Quality of Power

作者： R. Pindado C. Jaen J. Pou Department of Electronic Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

A new procedure is presented, applied to single-phase DC-AC power converters with bipolar output, in order to perform a programmed harmonic elimination using a previous calculation of notch angles. The method is based on the transformation of the trigonometric equations system into its equivalent in algebraic form by means of Chebyshev functions. This gives notable advantages in terms of convergence and processing time. Later, a modulation technique is described for single-phase unipolar output power converters, that obtains an additional elimination on the three multiples order harmonic range. Finally, comparative results to the conventional SPWM (sinusoidal pulse width modulation) wave are presented.

关键词： Pulse width modulation Robustness Chebyshev approximation Pulse width modulation converters Equations Voltage Delta modulation modulation coding Switches Harmonics suppression

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Neural networks and semi-closed-loop predictive vector quantization for image compression

Neural networks and semi-closed-loop predictive vector quant...

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IEEE International Conference on Image Processing

作者： R. Cierniak L. Rutkowski Institute of Electronics and Control Systems Technical University of Czestochowa Poland

A new algorithm for image compression, named predictive vector quantization (PVQ), is developed based on competitive neural networks and optimal linear predictors. The semi-closed-loop PVQ methodology is suggested. Th... 详细信息

关键词： Neural networks Vector quantization Image coding Pulse modulation Image reconstruction modulation coding Pixel Decoding Control systems Electronic mail

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Layered space-frequency bit-interleaved coded modulation for MIMO systems

Layered space-frequency bit-interleaved coded modulation for...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： M.R. Mckay I.B. Collings Telecommunications Laboratory Sch. of Elec. and Info. Engineering University of Sydney Australia ICT Centre CSIRO Australia

We consider a layered space-frequency (LSF) extension to bit-interleaved coded modulation (BICM) for MIMO-OFDM systems. We derive tight analytical bounds for the coded BER when using zero-forcing (ZF) detectors. The analysis does not rely on standard BICM expurgation techniques, and provides exact expressions for the codeword pairwise error probability at high SNR. We show that the LSF extension achieves the same diversity order as non-layered systems, while also achieving significant cant SNR gains when the number of transmit antennas is large. We quantify the SNR gain and show that it is a function of the antenna configuration only, and is independent of the modulation and coding parameters. We also present simulation results for MIMO extensions to IEEE 802.11a OFDM WLANs

关键词： Interleaved codes modulation coding MIMO OFDM modulation Bit error rate Detectors Pairwise error probability Transmitting antennas Maximum likelihood detection Convolutional codes

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An adaptive spread spectrum correlation receiver

An adaptive spread spectrum correlation receiver

引用

IEEE Conference on Decision and Control

作者： John J. Patti Allan W. Roeder DCID Rome Air Development Center Rome NY USA Aircraft Equipment Division General Electric Company Limited Utica NY USA

The optimum adaptive receiver for the line of sight microwave transmission channel is developed assuming that the channel consists of a purely multipath structure yielding signals received at various delays, and that the variations of the parameters of the channel are much slower than the data bit rate. The receiver is adaptive in the sense that it contains a record of the channel parameters in a memory. The time constant of the smoothing filter is adjustable. An expression for a figure of merit is developed and presented. An experimental model of the receiver is described and preliminary experimental results are presented.

关键词： Spread spectrum communication Equations Bandwidth Aircraft Microwave devices Delay Bit rate Smoothing methods Filters modulation coding

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Wideband frequency excursions in computed AM-FM image models

Wideband frequency excursions in computed AM-FM image models

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IEEE Southwest Symposium on Image Analysis and Interpretation

作者： J.P. Havlicek D.S. Harding N.D. Mamuya A.C. Bovik Sch. of Electr. Eng. & Comput. Sci. Oklahoma Univ. Norman OK USA Center for Vision and Image Sciences University of Technology Austin TX USA School of Electrical & Computer Eng. University of Oklahama Norman OK USA

We examine two paradigms for computing multicomponent AM-FM image models. In channelized components analysis, estimates for one AM-FM component are extracted from each channel of a multiband filterbank. Tracked multi-component analysis represents an image using fewer components by tracking the estimated modulating functions of each component across the filter bank channels. While both approaches work well for synthetic images, they have difficulty with natural images that contain phase discontinuities. We show that phase discontinuities lead to wideband frequency excursions that make the computation of AM-FM models difficult and can also severely degrade the quality of image reconstructions obtained from the models. We use postfilters to ameliorate the effects of the frequency excursions and compute AM-FM models for two natural images.

关键词： Wideband Filter bank Image analysis Image reconstruction Military computing Computer vision Image representation Frequency modulation modulation coding Frequency domain analysis

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Iterative Partial PIC for Convolutionally Coded Multi-Carrier DS-CDMA

Iterative Partial PIC for Convolutionally Coded Multi-Carrie...

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International Conference on Computational Intelligence and Software Engineering (CiSE)

作者： Guoxiong Xu Quanhang Liu Sch. of Electron. Inf. Zhongyuan Univ. of Technol. Zhengzhou China

In this paper, we consider convolutionally coded multi-carrier DS-CDMA and propose turbo partial parallel interference cancellation (PPIC) and decoding, which is termed turbo PPIC/decoding. We make analysis and simulations for turbo PPIC/decoding by the computer. The simulation results shows that turbo PPIC/decoding, whether with a priori LLR feedback or with a posteriori LLR feedback, obtains the most dominant performance improvement for the first three iterations, but up to the fourth iteration, the performance improves little, and for the same number of iterations, turbo PPIC/decoding with a posteriori LLR feedback outperforms that with a priori LLR feedback in performance. We also compare turbo PPIC /decoding with turbo PIC/decoding which was previously discussed, which shows that Turbo PPIC /decoding is dominantly superior to Turbo PIC /decoding in performance.

关键词： Convolutional codes Multiaccess communication Iterative decoding Multiuser detection Interference cancellation Multiple access interference Feedback Convolution Computational modeling modulation coding

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Multilevel transmission scheme in single frequency networks

Multilevel transmission scheme in single frequency networks

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Asia-Pacific Conference on Microwave

作者： Xiang-Tao Sun Ke Gong Department of Electronic Engineering State Key Laboratory on Microwave and Digital Communications Tsinghua University Beijing China

ISBN: (纸本)078039433X

This paper tries to develop a multilevel transmission scheme for broadcasting data in wireless digital communication systems, which will allow users to have different data receiving rate according to the channel quality or the receiver ability. Multilevel coding and multiresolution modulation are the pivotal technology of this scheme. A set partitioning strategy and multistage decoding structure are discussed. The analysis and simulation results show that the performances of the system are both excellent in AGWN channel and multipath fading channel in SFN. The scheme can provide unequal error protection for different priority bits and achieve multilevel transmission for broadcasting data.

关键词： Frequency Wireless communication Digital communication modulation coding Decoding Performance analysis Analytical models Fading Error correction codes Broadcasting

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P5B-13 Improved Ultrasound Contrast Agent Detection in a Clinical Setting

P5B-13 Improved Ultrasound Contrast Agent Detection in a Cli...

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IEEE Symposium (IUS) Ultrasonics

作者： M. Emmer G. Matte P. van Neer A. van Wamel N. de Jong Biomedical Engineering Thorax Centre Erasmus Medical Center Rotterdam Rotterdam Netherlands Foundation for Fundamental Research on Matter Utrecht Netherlands Inter university Cardiology Institute of the Netherlands Utrecht Netherlands Physics of Fluids University of Twente Enschede Netherlands

Optical studies have shown threshold behaviour of phospholipid-coated contrast agent microbubbles. Below the acoustic pressure threshold, phospholipid-coated microbubbles oscillate significantly less than above the threshold. For microbubbles smaller than 3.0 mum diameter, pressure-dependent scattering was measured, which is believed to be the result of threshold behaviour. The aim of this study is to investigate if threshold behaviour is useful to enhance the contrast in power modulation images. For levovist and BR14 suspensions (filtered and native), a programmable ultrasound system recorded power modulation images at 2 MHz and acoustic pressures between 25 and 250 kPa. Results were compared to intensities recorded with a commercial ultrasound system. An inverse relationship between the pressure-dependency of the scattering and microbubble size was observed. Threshold behaviour enhances the contrast in power modulation images. Using a suspension with microbubbles smaller than 2.0 mum, at 2 MHz transmit frequency and an acoustic pressure of 250 kPa, the CTR value was 33 dB, which is 13 dB higher compared to a native BR14 suspension.

关键词： Ultrasonic imaging Optical scattering Suspensions Acoustic scattering Acoustic signal detection Optical filters Acoustic measurements Ultrasonic variables measurement modulation coding Frequency

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Turbo trellis coded modulation for fading channels

Turbo trellis coded modulation for fading channels

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IEEE Conference on Vehicular Technology (VTC)

作者： J. Yuan W. Feng B. Vucetic School of Electrical and Information Engineering University of Sydney Sydney NSW Australia

The paper presents new power and bandwidth efficient coding schemes that combine turbo codes with M-QAM modulation for fading channels. In the encoder, each group of information bits is associated with its parity check symbol which is alternately obtained from the first and second turbo component encoders. The coded digits of the two encoders are mapped to the in-phase and quadrature components of a modulation signal constellation separately. In the decoder, iterative decoding with symbol-by-symbol MAP algorithm can be employed. Using this approach, code schemes for bandwidth efficiencies of 2, 3 and 4 bits/s/Hz with M-QAM modulation are investigated. The simulation results show that the new schemes have superior performance to the known codes for the same bandwidth efficiency and interleaver size.

关键词： modulation coding Fading Bandwidth Turbo codes Iterative decoding Rayleigh channels Iterative algorithms Hamming distance Parity check codes Random variables

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modulation-mode and power assignment for MIMO-BICM schemes

Modulation-mode and power assignment for MIMO-BICM schemes

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ITG Workshop on Smart Antennas

作者： Andreas Ahrens Volker Kuhn Institute of Communications University of Rostock Rostock Germany

In this contribution we jointly optimize the number of activated MIMO layers and the number of bits per symbol along with the appropriate allocation of the transmit power under the constraint of a given fixed data throughput and integrity. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different signal constellations and mappings were used within a single codeword. EXIT charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding.

关键词： MIMO Interleaved codes modulation coding Transmitters Constraint optimization Throughput Constellation diagram Signal mapping Iterative decoding Bandwidth

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