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检索条件"主题词=Convolutional coding"

共 225 条记录，以下是141-150 订阅

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Performance of Rate 1/2 convolutional Encoder with Adaptive Feedback-Controlled on Hyperchaotic-Chaotic States

Performance of Rate 1/2 Convolutional Encoder with Adaptive ...

引用

Conference of the Complex Adaptive Systems on Responding to Continuous Global Change in Systems Needs

作者： Arasteh, Davoud So Univ & A&M Coll Dept Elect Engn Technol Baton Rouge LA USA

In this paper we have studied the performance of rate. 1/2 convolutional encoders with adaptive states developed in chaotic and hyperchaotic regions. These states are generated by varying the control parameters in a feedback. controlled system. Several sets of closed. loop simulations are performed to demonstrate the benefit of information. based chaos system. In particular, it is demonstrated that two varieties of an information. based systems provide improved performance over all the encoder choices when hyperchaos states are utilized. Special attention was paid to the algorithmic complexity of the systems for an entire class of rate. 1/2 encoders. The decoder is able to recover the encrypted data and is able to reasonably estimate the bit error rate for different signal strengths under a noisy AWGN channel. This indicates that the encoder can update the information map in real time to compensate for changing data for both chaotic and hyperchaotic states. This is the evidence that occasional changes in the data stream can be handled by the decoder in a real time application. Numerical evidence indicates algorithmic complexity associated with the hyperchaotic. encrypted and convolutionally-encoded data, provide better security along with the increase in the error correcting capacity of the decoder. (C) 2010 Published by Elsevier B.V.

关键词： Chaotic encryption convolutional coding algorithmic complexity Feedback-Controlled Hyperchaotic System

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Multiple symbol differential detection in jammed FH systems

Multiple symbol differential detection in jammed FH systems

引用

15th IEEE International Symposium on Personal, Indoor, Mobile, Radio Communications (PIMRC 2004)

作者： Koivu, S Siltala, S Iinatti, J Univ Oulu Ctr Wireless Commun FI-90014 Oulu Finland

ISBN: (纸本)0780385233

Non-coherent detection is usually applied in frequency hopping (FH) systems, because reliable coherent detection is very difficult. With multiple symbol differential detection (MSDD) a non-coherent system can achieve the performance of coherent differentially encoded systems. Due to its is complexity, two computationally simpler hard-decision feedback algorithms, multiple-symbol based decision-feedback differential detection (MSD DF-DD) and multiple symbol observation interval (MSOI), are studied and compared in partial-band jammed FH system. Additionally the system which uses maximum- a-posteriori (MAP) algorithm as inner decoder is studied and its performance is compared to MSD DF-DD and MSOI. The performance improvement of the MSD DF-DD and MSOI using two simple limiters are also studied. The non-iterative versions of MSD DF-DD and MSOI have very similar performance. MSD DF-DD benefits from the iterative processing more effectively than MSOI in jammed and non-jammed simulations. The impact of jamming depends strongly on its bandwidth. The narrower the jamming band is, the more the performance of the alaorithms decrease. MAP-based decoding performs significantly better than either of the algorithms.

关键词： convolutional coding hard decision feedback limiter partial-band jamming

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Deep Cross-Modal Hashing 30

Deep Cross-Modal Hashing

引用

30th IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Jiang, Qing-Yuan Li, Wu-Jun Nanjing Univ Dept Comp Sci & Technol Collaborat Innovat Ctr Novel Software Technol & I Natl Key Lab Novel Software Technol Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781538604571

Due to its low storage cost and fast query speed, crossmodal hashing (CMH) has been widely used for similarity search in multimedia retrieval applications. However, most existing CMH methods are based on hand-crafted features which might not be optimally compatible with the hash-code learning procedure. As a result, existing CMH methods with hand-crafted features may not achieve satisfactory performance. In this paper, we propose a novel CMH method, called deep cross-modal hashing (DCMH), by integrating feature learning and hash-code learning into the same framework. DCMH is an end-to-end learning framework with deep neural networks, one for each modality, to perform feature learning from scratch. Experiments on three real datasets with image-text modalities show that DCMH can outperform other baselines to achieve the state-of-the-art performance in cross-modal retrieval applications.

关键词： Neural networks Databases Training convolutional codes Binary codes Semantics Machine learning binary code convolutional coding Semantics Neural network Cross-modal Database Familial Hypertrophic Cardiomyopathy Functional training hashing Artificial Intelligence Machine Learning Training semiotics

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A Complete MacWilliams Theorem for convolutional Codes

A Complete MacWilliams Theorem for Convolutional Codes

引用

IEEE Information Theory Workshop (ITW)

作者： Lai, Ching-Yi Hsieh, Min-Hsiu Lu, Hsiao-feng Univ Technol Sydney Ctr Quantum Computat & Intelligent Syst Fac Engn & Informat Technol Sydney NSW 2007 Australia Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu 30010 Taiwan

ISBN: (纸本)9781479959990

In this paper, we prove a MacWilliams identity for the weight adjacency matrices based on the constraint codes of a convolutional code (CC) and its dual. Our result improves upon a recent result by Gluesing-Luerssen and Schneider, where the requirement of a minimal encoder is assumed. We can also establish the MacWilliams identity for the input-parity weight adjacency matrices of a systematic CC and its dual. Most importantly, we show that a type of Hamming weight enumeration functions of all codewords of a CC can be derived from the weight adjacency matrix, which thus provides a connection between these two very different notions of weight enumeration functions in the convolutional code literature. Finally, the relations between various enumeration functions of a CC and its dual are summarized in a diagram. This explains why no MacWilliams identity exists for the free-distance enumerators.

关键词： convolutional codes Fourier transforms Hamming weight Kernel Optical wavelength conversion Systematics Vectors Hamming weight Optical wavelength conversion Dual Kernel convolutional coding Fourier Transform

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Improved convolutional code design for 3GPP TDD systems

Improved convolutional code design for 3GPP TDD systems

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IEEE Wireless Communications and Networking Conference

作者： Wu, G Li, YH Philips Res E Asia Shanghai 200070 Peoples R China

ISBN: (纸本)0780389662

convolutional code is one of important channel codes to combat fading and noise in 3GPP 3.84/1.28Mcps TDD systems. However, the design of the convolutional codes used in current specifications just obtain the best performance for BPSK modulation and AWGN propagation channel. In 3GPP 3.84/1.28Mcps TDD systems, QPSK modulation is adopted. Moreover, multipath fading channels are often encountered in the practical communication environments. Therefore, convolutional codes used in the specifications cannot always achieve the best performance in the practical 3GP 3.84/1.28Mcps TDD systems. In this paper, we proposed an improved convolutional encoder for 3GPP 3.84/1.28Mcps TDD downlink system by analyzing the integration effects of QPSK modulation and multipath fading channels on the code design. Performance analysis and simulation show that better system performance can be achieved by using the proposed encoder.

关键词： convolutional coding 3GPP TDD rayleigh fading channel

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IRA Code Design for Iterative Detection and Decoding: A Setpoint-based Approach 79

IRA Code Design for Iterative Detection and Decoding: A Setp...

引用

IEEE 79th Vehicular Technology Conference (VTC-Spring)

作者： Lenkeit, F. Bockelmann, C. Wuebben, D. Dekorsy, A. Univ Bremen Dept Commun Engn D-28359 Bremen Germany

ISBN: (纸本)9781479944828

In this paper, a novel setpoint-based design approach for Irregular Repeat Accumulate (IRA) codes in iterative detection and decoding structures is presented. In contrast to conventional IRA code design in which the convolutional decoder is combined with the detector, the goal behind this approach is to keep the IRA decoding structure consisting of convolutional decoder and repetition decoder intact, i.e. to consider it as an inner loop of the overall detection structure. The outer loop is then composed of the IRA decoder and the system specific detector. This approach requires to adapt the irregular repetition code jointly to the convolutional decoder as well as to the detector which is achieved by formulating setpoints for the inner and outer code characteristic. As will be shown, the presented code design approach, although starting from a completely different viewpoint as the conventional approach, leads to an irregular repetition code with a very similar transfer characteristic and code rate than the conventional approach.

关键词： convolutional codes iterative decoding IRA code design convolutional decoder irregular repeat accumulate codes irregular repetition code iterative detection repetition decoder setpoint based design convolutional codes Decoding Detectors Iterative decoding Iterative methods MIMO Turbo codes Iterative decoding convolutional coding DEcoding turbo codes iterative methods multiple input multiple output systems detector repetition coding decoders Codes

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Recursive Spatial Multiplexing in Interference-Limited Indoor Scenarios 21

Recursive Spatial Multiplexing in Interference-Limited Indoo...

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21st IEEE Symposium on Communications and Vehicular Technology in the BeNeLux (IEEE SCVT)

作者： Shah, Ibrahim A. Dahlhaus, Dirk Mohamad, Usama Y. Mansour, Nour Hunziker, Thomas Univ Kassel Commun Lab Kassel Germany Lucerne Univ Appl Sci & Arts Luzern Switzerland

ISBN: (纸本)9781479980307

Recursive spatial multiplexing (RSM), a closed loop multiple-input multiple-output (MIMO) structure for achieving the capacity offered by MIMO channels with a low-complexity detector, is investigated in measured indoor MIMO transmission channels limited by different types of interference. It is seen that RSM can deal effectively with interferences following either a Gaussian mixture or Middleton distribution. In cases of interferences which are symmetric alpha stable distributed, however, RSM suffers from a performance degradation. Performance improvements resulting from the use of a convolutional coding at the single-input single-output (SISO) encoder of the RSM architecture are investigated for the different interference distributions.

关键词： Gaussian processes MIMO communication convolutional codes indoor radio radiofrequency interference space division multiplexing Gaussian mixture Middleton distribution RSM SISO encoder convolutional coding indoor MIMO transmission channels interference-limited indoor scenarios low-complexity detector multiple-input multiple-output structure recursive spatial multiplexing single-input single-output encoder symmetric alpha stable Bit error rate Covariance matrices Interference MIMO Multiplexing Receivers Vectors convolutional coding space division multiplexing multiple input multiple output systems indoor radio MIMO communication Radiofrequency interference Gaussian processes Bit error rate MULTIPLEXOR Receivers interference variance covariance matrix Covariance matrix

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Extracting Features from Requirements: Achieving Accuracy and Automation with Neural Networks 25

Extracting Features from Requirements: Achieving Accuracy an...

引用

25th IEEE International Conference on Software Analysis, Evolution and Reengineering (SANER)

作者： Li, Yang Schulze, Sandro Saake, Gunter Otto Von Guericke Univ Magdeburg Germany

ISBN: (纸本)9781538649695

Analyzing and extracting features and variability from different artifacts is an indispensable activity to support systematic integration of single software systems and Software Product Line (SPL). Beyond manually extracting variability, a variety of approaches, such as feature location in source code and feature extraction in requirements, has been proposed for automating the identification of features and their variation points. While requirements contain more complete variability information and provide traceability links to other artifacts, current techniques exhibit a lack of accuracy as well as a limited degree of automation. In this paper, we propose an unsupervised learning structure to overcome the abovementioned limitations. In particular, our technique consists of two steps: First, we apply Laplacian Eigenmaps, an unsupervised dimensionality reduction technique, to embed text requirements into compact binary codes. Second, requirements are transformed into a matrix representation by looking up a pre-trained word embedding. Then, the matrix is fed into CNN to learn linguistic characteristics of the requirements. Furthermore, we train CNN by matching the output of CNN with the pre-trained binary codes. Initial results show that accuracy is still limited, but that our approach allows to automate the entire process.

关键词： Feature extraction Convolution Binary codes Laplace equations convolutional codes Predictive models Semantics binary code Laplace's equation Feature extraction convolutional coding Automation Convolution Prediction models Semantics Matrix representation Neural network

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An Integrated System for Underwater Wireless Image Transmission 28

An Integrated System for Underwater Wireless Image Transmiss...

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28th IEEE International Conference on Microelectronics (ICM)

作者： Atallah, Asmaa M. Ali, Hanaa S. Abdallah, M. I. Zagazig Univ Fac Engn Dept Elect & Commun Zagazig Egypt

ISBN: (纸本)9781509057214

This paper focuses on presenting an efficient underwater acoustic communication system for image transmission. Water nature slows propagation speed down, and corrupts the transmitted signal. Moreover, the channel capacity is limited. The proposed system aims at effectively withstanding channel effects, minimizing the bit error rate and obtaining images with acceptable quality at the receiver. This system includes four parts;image source coding, channel coding, modulation scheme and image denoising. Set partitioning in hierarchical trees (SPIHT) is used for efficient image compression. To detect transmission errors, reduce the decoder complexity and increase the efficiency of transmission, convolutional coding is employed. Quadrature amplitude modulation (4-QAM) is used with orthogonal frequency division multiplexing (OFDM) to provide a reliable spectrally efficient system and enhance its resistivity to channel effects. Differential coding is used with 4-QAM to handle phase errors, while avoiding complex carrier tracking. To improve the image quality, 2-D double-density dual-tree complex discrete wavelet transform (DWT) is used to denoise the received decompressed image. Simulation results show that the proposed system is capable of transmitting and receiving underwater images with acceptable quality.

关键词： underwater channel convolutional coding SPIHT OFDM image denoising differential QAM

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Delay-Exponent of Bilayer Anytime Code

Delay-Exponent of Bilayer Anytime Code

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IEEE Information Theory Workshop (ITW)

作者： Noor-A-Rahim, Md. Nguyen, Khoa D. Lechner, Gottfried Univ South Australia Inst Telecommun Res Adelaide SA Australia

ISBN: (纸本)9781479959990

In this paper, we study the design and the delay-exponent of anytime codes over a three terminal relay network. We propose a bilayer anytime code based on anytime spatially coupled low-density parity-check (LDPC) codes and investigate the anytime characteristics through density evolution analysis. By using mathematical induction technique, we find analytical expressions of the delay-exponent for the proposed code. Through comparison, we show that the analytical delay-exponent has a close match with the delay-exponent obtained from numerical results.

关键词： convolutional codes Decoding Delays Encoding Noise measurement Parity check codes Relays parity check codes Noise measurement convolutional coding relay DEcoding Codes delay Relay networks coding

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