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检索条件"主题词=modulation coding"

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New views of transfer function based performance analysis of coded modulations

New views of transfer function based performance analysis of...

引用

Asilomar Conference on Signals, Systems & Computers

作者： D. Kucukyavuz M.P. Fitz Department of Electrical Engineering Ohio State Uinversity USA

Transfer function methods are attractive in the performance analysis of coded modulations since they allow averaging of all possible error event probabilities. However, they can be computationally intensive when the code has a large number of states. A method to reduce the complexity of the transfer function method is proposed. In addition, transfer function methods for computing the upper bound of the bit error probability in a flat fading channel are presented. These bounds are simple and tight at high SNR.

关键词： Transfer functions Performance analysis modulation coding Fading Upper bound Decoding Error probability Digital communication Interleaved codes AWGN channels

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Nonuniformly offset polyphase synthesis of a bandpass signal from complex-envelope samples

Nonuniformly offset polyphase synthesis of a bandpass signal...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： D. Scholnik J.O. Coleman Radar Division Naval Research Laboratory Inc. Washington D.C. DC USA

In this paper we consider the synthesis of a bandpass signal from complex-envelope samples using a polyphase conversion structure based on periodically nonuniform output samples. This approach provides the flexibility to independently choose the sampling rate and carrier frequency, overcoming the restrictions of reconstruction from uniformly spaced output samples. Key to the design of such a system is a particular equivalent filter with a piecewise-constant impulse response that determines both the actual implementation filters and system performance. The transition times of this impulse response are found to be periodically nonuniform, leading to a characterization of the corresponding frequency response. An example design using a previously unavailable carrier frequency is presented which requires fewer filter taps than the alternative, a higher-rate uniform system.

关键词： Signal synthesis Band pass filters Finite impulse response filter Nonlinear filters Sampling methods modulation coding Frequency response Linear programming Laboratories Radar

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Adaptive coded-modulation in multipath fading channels

Adaptive coded-modulation in multipath fading channels

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IEEE Conference on Vehicular Technology (VTC)

作者： Young Min Kim W.C. Lindsey Communication Science Institute University of Southern California Los Angeles CA USA LinCom Corporation Los Angeles CA USA

We have seen an explosive expansion and growth in wireless communications and a vision of communicating; any-where any-time is becoming reality. Future mobile radio systems are projected to support a data rate of up to a few Mbps. Considering current digital mobile radio systems are being operated at a spectral efficiency less than 1 bit/sec/Hz, the spectral efficiency of future wireless systems must be increased substantially to maximize the utilization of scarce radio spectrum and to make such high data rate services economically feasible. Adaptive coded modulation (ACM) is a promising way to provide a substantial improvement in spectral efficiency for slow fading channels. The basic idea is to adapt system functionality such as modulation, coding, information rate, and transmission power to varying channel conditions. In this work the potential of adaptive coded modulation was investigated using cut-off rate analysis in multipath fading channels. It was shown that the adaptive coded modulation can provide several folds of increase in spectral efficiency compared to a fixed modulation system employing QPSK when the channel varies slowly.

关键词： Fading Frequency modulation coding Shape Power system modeling Channel state information Pulse shaping methods AWGN Mobile communication Explosives

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Analysis of fuzzy logic and autoregressive video source predictors using T-tests

Analysis of fuzzy logic and autoregressive video source pred...

引用

International Symposium on Signal Processing and Its Applications (ISSPA)

作者： B. Qiu School of Computer Science and Software Engineering Monash University Clayton VIC Australia

This paper presents performance comparison of a fuzzy logic predictor and an autoregressive predictor. Multi-step ahead predictions were made on the traffic intensity of digital video sources coded with an MPEG coder (hybrid motion compensation/differential pulse code modulation/discrete cosine transform method). Although current coding standards recommend constant bit rate (CBR) output by means of a smoothing buffer, the method inherently produces variable bit rate (VBR) output, and VBR transmission is necessary for high quality delivery. Prediction results described in this paper have been obtained using a fuzzy logic prediction scheme, and the conventional linear autoregressive (AR) algorithm. Prediction errors are analysed with low order statistical parameters and hypothesis tests. The proposed fuzzy prediction methods offer higher accuracy and can be applied to the development of usage parameter control (UPC), connection admission control (CAC) and congestion control algorithms in ATM networks.

关键词： Fuzzy logic Pulse modulation Bit rate Motion compensation Digital modulation Intensity modulation modulation coding Discrete cosine transforms Smoothing methods Error analysis

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A class-coded modulation method using orthogonal wavelets

A class-coded modulation method using orthogonal wavelets

引用

IEEE Conference on Wireless Communications and Networking

作者： E. Okamoto Huan-Bang Li M. Tanaka H. Wakana Communications Research Laboratories Kashima Ibaraki Japan

Researchers have studied two types of digital multi-carrier modulation, wavelet packet modulation (WPM), and fractal modulation. The advantage of WPM is that it allows signal time and frequency to be divided and multiplexed. Therefore the time and frequency of noise signals, e.g., tone and impulse noise, can be identified and effectively partitioned in packets. Using this advantage, we propose a class-coded modulation method for WPM that has good bit error rate (BER) performance when the length of the code constraint is extended and can select time and frequency noise signals simultaneously. This report describes the proposed method and the computer simulations carried out to test its effectiveness.

关键词： Digital modulation Block codes Bit error rate modulation coding Wavelet packets Working environment noise Fractals Frequency conversion Decoding Testing

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Iterative decoding of product codes with a priori information over a Gaussian channel for still image transmission

Iterative decoding of product codes with a priori informatio...

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Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042)

作者： A. Elbaz R. Ryndiah B. Solaiman O. Ait Sab Department Signal et Communication Technopôle Brest Iroise ENST de Bretagne Brest France IMT Atlantique Bretagne-Pays de Loire Brest Bretagne FR

In this paper we propose an optimized transmission system for still images. This system comprises a VQ source encoder with a compression rate of 9. The source data is encoded using a BCH product code and mapped on a 16-QAM constellation. The codebook and channel encoder have been optimized to minimize distortion in presence of transmission errors. We use a new joint source-channel turbo decoding algorithm of the product code. As compared to classical channel decoding algorithms (soft decoding), we obtain an improvement of 0.7 dB in terms of coding gain for a BER of 10/sup -5/. The PSNR of the received image exhibits an improvement of 11 dB as compared to conventional turbo decoding at low SNRs.

关键词： Iterative decoding Product codes Gaussian channels Books Source coding Channel coding Prototypes Vector quantization Image coding modulation coding

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An active tagging system using circular polarization modulation

An active tagging system using circular polarization modulat...

引用

Microwave, MTT-S International Symposium

作者： M. Kossel H. Benedickter W. Baechtold Laboratory for Electromagnetic Fields and Microwave Electronics Swiss Federal Institute of Technology Zurich Switzerland

An active read/write microwave tagging system using circular polarization modulation as a novel modulation scheme for RFID systems to reduce demodulation complexity and power consumption on the battery powered tag is presented. Additional coding of the circular polarization modulated data reduces transmission errors due to polarization inversion at multipath propagation.

关键词： Tagging Batteries modulation coding Radio frequency Electromagnetic wave polarization Demodulation Signal processing Decoding Switches Microwave technology

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Orthogonality division multiple access LTI transmit filters for ISI-channels

Orthogonality division multiple access LTI transmit filters ...

引用

IEEE International Conference on Communications (ICC)

作者： A.F. Shalash K.K. Parhi Level One Communications New Jersey Design Center Morganville NJ USA Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN USA

In this paper, the problem of multiple access over digital subscriber loops is introduced and defined as FIR LTI filter design over linear dispersive channels. The 2-D FIR CAP/QAM based modulation line code is extended to the multi-dimensional system to accommodate multiple access topology. The concept of orthogonality division multiple access, ODMA, is used as the methodology to achieve that goal. The problem of increasing the number of dimensions is stated as a minimax optimization problem, then solved using sequential quadratic programming. 3, 4, and 6-dimensional systems are introduced to support multiple access applications. Computer simulations are carried out to evaluate the performance and functionality of the orthogonal signaling line code.

关键词： Finite impulse response filter DSL Digital filters Nonlinear filters Dispersion Quadrature amplitude modulation modulation coding Multidimensional systems Topology Minimax techniques

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Soft-output decoding for concatenated error correction in high-order PRML channels

Soft-output decoding for concatenated error correction in hi...

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IEEE International Conference on Communications (ICC)

作者： H. Sawaguchi S. Mita Central Research Laboratory Hitachi and Limited Kokubunji Tokyo Japan Data Storage and Retrieval Division Hitachi and Limited Odawara Kanagawa Japan

A soft-output decoding scheme was developed for the cyclic-redundancy-check error-correction-code (CRCC) concatenated error correction by applying the list and soft-symbol-output Viterbi algorithm (list-SOVA). By focusing on just the specified dominant error-events in the maximum-likelihood (ML) sequence detector, a soft-output data-reliability generator and a list generator were efficiently simplified for soft-output decoding. The soft-output decoding enables multiple dominant error events within a data block to be corrected without increasing the CRCC redundancy and modifying the CRCC structure. It can also help prevent the CRCC miscorrection when correcting the multiple error-events. It was confirmed that the soft-output decoding with a reasonably sized data-block list can perfectly correct the double error-events within a data-block on a 16/17 rate quasi-MTR-coded modified E/sup 2/PRML (ME/sup 2/PRML) channel at a practical error-rate.

关键词： Concatenated codes Error correction Maximum likelihood decoding Detectors Error correction codes Viterbi algorithm Maximum likelihood detection Redundancy Magnetic recording modulation coding

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Discrete multitone modulation with least squares inverse channel filtering

Discrete multitone modulation with least squares inverse cha...

引用

IEEE International Conference on Personal Wireless Communication

作者： V.U. Reddy B.K. Dey S. Dasgupta Department of Electrical Communication Engineering Indian Institute of Science Bangalore India ECE Department University of Iowa USA

ADSL (asymmetric digital subscriber line) transmission technology meets Internet access requirement quite well and offers telephone companies a technology for connecting virtually all Internet users at megabit rates. The ANSI (American National Standards Institute) proposes discrete multitone (DMT) modulation with DFT (discrete Fourier transform) bases as the carriers for the ADSL system. Recently, discrete wavelet multitone modulation has been studied with non-blind and blind equalization schemes. We propose an entirely different approach which combines the multitone modulation and optimal orthonormal subband coding.

关键词： OFDM modulation Least squares methods Discrete Fourier transforms DSL Internet telephony Joining processes ANSI standards Discrete wavelet transforms Blind equalizers modulation coding

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