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检索条件"主题词=convolutional Coding"

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Anytime Properties of Protograph-Based Repeat-Accumulate Codes

Anytime Properties of Protograph-Based Repeat-Accumulate Cod...

引用

IEEE Information Theory Workshop

作者： Zhang, Nan Noor-A-Rahim, Md. Vellambi, Badri N. Nguyen, Khoa D. Univ South Australia Inst Telecommun Res Adelaide SA 5095 Australia New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA

ISBN: (纸本)9781467378529

In this paper, a highly efficient protograph-based repeat-accumulate (P-RA) anytime code is proposed, which is derived from the combination of protograph-based low-density parity-check convolutional (P-LDPCC) and spatially coupled low-density parity-check convolutional (SC-LDPCC) codes. Density evolution technique is applied to demonstrate the anytime properties of the P-RA codes over the binary erasure channel (BEC). The simulation results show that P-RA codes perform better than SC-LDPCC and P-LDPCC codes. More importantly, the finite-length performance of P-RA codes is only dependent on the decoding delay rather than the decoding message position.

关键词： convolutional codes Decoding Delays Indexes Parity check codes Reliability theory reliability theory parity check codes DEcoding convolutional coding Codes delay Parity check

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Series concatenation of 2D convolutional codes 9

Series concatenation of 2D convolutional codes

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IEEE 9th International Workshop on Multidimensional (nD) Systems (nDS)

作者： Climent, Joan-Josep Napp, Diego Pinto, Raquel Simoes, Rita Univ Alacant Dept Matemat Ap Correus 99 E-03080 Alacant Spain Univ Aveiro Dept Math CIDMA Ctr Res & Dev Math & Applicat P-3810193 Aveiro Portugal

ISBN: (纸本)9781479987399

In this paper we study two-dimensional (2D) convolutional codes which are obtained from series concatenation of two 2D convolutional codes. In this preliminary work we confine ourselves to dealing with finite-support 2D convolutional codes and make use of the so-called Fornasini-Marchesini input-state-output (ISO) model representations. In particular, we show that the series concatenation of two 2D convolutional codes is again a 2D convolutional code and we explicitly compute an ISO representation of the code. Within these ISO representations we study when the structural properties of reachability and observability of the two given ISO representations carry over to the resulting 2D convolutional code.

关键词： concatenated codes convolutional codes Fornasini-Marchesini input-state-output model representations ISO model representations finite support 2D convolutional codes series concatenation convolutional codes ISO Linear systems Observability Polynomials Radio frequency Trajectory convolutional coding Observability ISO Concatenated codes radiofrequency Linear system trajectory Polynomial

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Estimation of the Noise Immunity of Troposphere Communication Systems with OFDM Signals and Available Ways to Increase Ones Bit Error Ratio

Estimation of the Noise Immunity of Troposphere Communicatio...

引用

Science and Information Conference (SAI)

作者： Rychkov, Eugene Patyukov, Victor Siberian Fed Univ Inst Engn Phys & Radio Elect Krasnoyarsk Russia

ISBN: (纸本)9781479985470

Research results are shown and noise immunity estimation is done for based on OFDM technolo*, tropospheric systems, with usage of the noise immunity of classical OFDM systems for mobile application. A modeling in MATLAB and LabVIEW PXI and an experimental test with error probability evaluation are performed. Investigation possibilities to tropospheric OFDM systems are estimated and proposed. System modules possible.

关键词： Noise immunity OM OFDM tropospheric inhomogeneity Rayleigh fading lognormal distribution convolutional coding PA PR frequency offset Doppler shift: weight function LabVIEW PXI FPGA XILINX Radiosvyaz MATLAB model WiEl 802.1.1a quasi-Rayleigh .BPSK QPSK 16-QAM convolutional coding PAPR reduction Guard Interval image transmission distortions zero-subcarriers pilots 5 Gllz

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Performance Estimation of DSSS Wireless Systems in Impulsive Interference

Performance Estimation of DSSS Wireless Systems in Impulsive...

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Joint IEEE International Symposium on Electromagnetic Compatibility (EMC) and EMC Europe

作者： Tengstrand, Sara Orn Stenumgaard, Peter Swedish Def Res Agcy Div Informat & Aeronaut Syst Kista Sweden

ISBN: (纸本)9781479966165

Radiated interference environments can significantly degrade the performance of the digital communication systems that are widely used today. Problems from such inter-system interference might need to be analyzed beforehand or as problems occur. Another application where such analysis is of interest is in systems using dynamic allocation of spectrum, where it serves as basis for spectrum allocation. To be useful in on-line applications, the analysis method should be fast and of low complexity. A common method is therefore to approximate the interference as Additive White Gaussian Noise, AWGN. However, if the noise is impulsive, this approximation can cause large errors in Bit Error Probability (BEP) estimation. It is desirable to avoid both under-and overestimations. Underestimations can lead to interference problems in the application, while overestimating could cause expensive protection measures to be used unnecessarily. One type of systems that have not received much interest regarding error estimation are those using both error correcting codes and direct sequence spread sprectrum, DSSS. Two systems using this combination are the third generation mobile telephony standard 3G UMTS, and the global navigation systems GPS and Galileo. In this paper we derive necessary conditions for when the Gaussian approximation can be used accurately for impulsive interference, in a DSSS system using convolutional coding.

关键词： impulsive interference Performance Evaluation Spectrum allocation direct sequence spread spectrum Interchannel interference Gaussian approximation AWGN Error analysis convolutional coding dynamic allocation Digital communication systems Error correction codes CARRIER SYSTEM galileo satellite navigation systems

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Self-Coded Distributed Space-Time coding for Two-way Full-Duplex Relay Networks

Self-Coded Distributed Space-Time Coding for Two-way Full-Du...

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IEEE Global Communications Conference

作者： Yi Liu Xiang-Gen Xia Zhiqiang Zhang Hailin Zhang State Key Laboratory of Integrated Service Network Xidian University Department of Electrical and Computer Engineering University of Delaware

ISBN: (纸本)9781479959532

In this paper, we consider two-way full-duplex (FD) relay networks, which allow relaying communications in both directions at the same time and over the same frequency band. We propose a distributed space-time coding scheme, which we call SC-DSTC (Self-Coded Distributed Space-Time coding), where the main idea is to perform convolutional encoding at the relay node and form a distributed linear convolutional space-time code (DLC-STC) together with the direct link. The convolutional code at the relay is realized by using part of the residual loop interference (RLI), which produces an automatic convolutional encoder. The amplifying factor is optimized when the loop channel information is imperfect. Simulation results show that the proposed SC-DSTC scheme can achieve asynchronous full cooperative diversity and is robust to the error of the loop channel information.

关键词： time coding space-time coding differential space-time coding Trunk Node Relay networks FULL DUPLEX convolutional coding Distribute Bidirectional relay

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Crypto-coding Technique for Land Mobile Satellite Channel

Crypto-Coding Technique for Land Mobile Satellite Channel

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5th International Conference on Signal and Image Processing (ICSIP)

作者： Khanai, Rajashri Kulkarni, G. H. Torse, Dattaprasad A. Gogte Inst Technol Dept Elect & Elect Engn Belgaum Karnataka India Jain Coll Engn Dept Elect & Elect Engn Belgaum Karnataka India Visvesvaraya Technol Univ Belgaum Karnataka India

ISBN: (纸本)9780769551005

In this paper, we have introduced an improved combined cryptography-error correction method, which is called "Crypto-coding". Although in previous experiments, combined error correction and encryption functionality has been studied into one single step, the modification needed in the introduction of encryption block improves the performance of the system. The combined System's performances are evaluated on Land Mobile Satellite (LMS) Channel. The results are compared with the system using ideal encryption and decryption.

关键词： Crypto-coding convolutional coding Simplified Data Encryption Standard Land Mobile Satellite (LMS) Channel

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Novel Fast Iterative Decoding Threshold Estimation for Protograph-Based LDPC convolutional Codes

Novel Fast Iterative Decoding Threshold Estimation for Proto...

引用

IEEE Global Communications Conference

作者： Tian Xia Hsiao-Chun Wu Hong Jiang School of Electrical Engineering and Computer Science Louisiana State University Alcatel-Lucent Bell Labs

ISBN: (纸本)9781479959532

The iterative decoding threshold (IDT) estimation for LDPC convolutional codes (LDPC-CCs) may become difficult over additive white Gaussian noise channels, especially when the termination length L gets very large or even approaches infinity. In this paper, we devise a novel fast IDT estimation scheme using the protograph-based extrinsic information transfer (PEXIT) analysis for protograph-based LDPC-CCs. Based on our new analysis, we propose a PEXIT-fast algorithm in which only the mutual information (MI) of a posteriori probability (APP) of the first variable node will be monitored to determine whether the current E_b/N_0 (signal-energy-per-information-bit to noise-power-spectral-density ratio) in evaluation is an upper bound or a lower bound of the IDT. Hence, it is no longer necessary to get through the whole MI evolution and the computational complexity can be greatly reduced thereby. We also design an efficient approach to determine the IDT for an LDPC-CC with an arbitrary large termination length L which can also be allowed to be infinity. The closeness between the known IDTs and the estimated IDTs using our proposed new method for several LDPC-CCs in simulation confirms the effectiveness of our scheme.

关键词： LDPC convolutional codes (LDPC-CCs) Iterative decoding threshold (IDT) Extrinsic information transfer (EXIT) analysis Protograph-based EXIT interdigital transducers AWGN channels AWGN Intimacy convolutional coding Iterative decoding Infinity low density parity check codes Upper bound complexity classes new methods

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Energy-Efficient Vision on the PULP Platform for Ultra-Low Power Parallel Computing

Energy-Efficient Vision on the PULP Platform for Ultra-Low P...

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IEEE Workshop on Signal Processing Systems (SiPS)

作者： Conti, Francesco Rossi, Davide Pullini, Antonio Loi, Igor Benini, Luca Univ Bologna Dept Elect Elect & Informat Engn Bologna Italy Swiss Fed Inst Technol Integrated Syst Lab Zurich Switzerland

ISBN: (纸本)9781479965885

Many-core architectures structured as fabrics of tightly-coupled clusters have shown promising results on embedded computer vision benchmarks, providing state-of-art performance with a reduced power budget. We propose PULP (Parallel processing Ultra-Low Power platform), an architecture built on clusters of tightly-coupled OpenRISC ISA cores, with advanced techniques for fast performance and energy scalability that exploit the capabilities of the STMicroelectronics UTB FD-SOI 28nm technology. As a use case for PULP, we show that a computationally demanding vision kernel based on convolutional Neural Networks can be quickly and efficiently switched from a low power, low frame-rate operating point to a high frame-rate one when a detection is performed. Our results show that PULP performance can be scaled over a 1x-354x range, with a peak performance/power efficiency of 211 GOPS/W.

关键词： Benchmark testing Clocks Computer architecture convolutional codes Kernel Parallel processing System-on-chip PARALLEL PROCESSING (COMPUTERS) Benchmark testing system-on-chip convolutional coding Computer Architecture Pulp Timing devices Kernel core construction tight coupling Sight Seeds

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Performance of Anti-Jamming Techniques with Bit Interleaving in OFDM-Based Tactical Communications 6

Performance of Anti-Jamming Techniques with Bit Interleaving...

引用

6th International Conference on Information Technology and Electrical Engineering (ICITEE)

作者： Puspitaningayu, Pradini Hendrantoro, Gamantyo Univ Negeri Surabaya Elect Engn Fac Engn Surabaya Indonesia Inst Teknol Sepuluh Nopember Elect Engn Fac Ind Technol Surabaya Indonesia

ISBN: (纸本)9781479953035

Tactical communications is a communication system which is applied to a military operation with some strict requirements compared to a commercial communication system. One of the important requirement is its security. This communication has a high risk to be attacked by jamming which generated by the adversary. The other important requirement is network flexibility to handle its high mobility and information exchange in a big order. To fulfil those special requirement of tactical communication, OFDM system is equipped with channel coding and interleaving to handle information damage caused by jamming. The jamming strategy used in this research is single-tone and multitone jamming which strike while information signal pass the AWGN channel. In this research,we evaluate the performance of OFDM system which is equipped with convolutional Encoder and Inter leaver with various schemes. By using a half-rate convolutional encoder, for both parameters BER and interleaving gain, helical-scan interleaver scheme shows the best performance among block and random interleaver. However due to its complexity in applying this scheme, block interleaver which is the second best is preferred.

关键词： Jamming convolutional coding Interleaving

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Toward Scalable Source Level Accuracy Analysis for Floating-point to Fixed-point Conversion 33

Toward Scalable Source Level Accuracy Analysis for Floating-...

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33rd IEEE/ACM International Conference on Computer-Aided Design (ICCAD)

作者： Deest, Gael Yuki, Tomofumi Sentieys, Olivier Derrien, Steven Univ Rennes 1 F-35014 Rennes France Inria Rocquencourt France

ISBN: (纸本)9781479962785

In embedded systems, many numerical algorithms are implemented with fixed-point arithmetic to meet area cost and power constraints. Fixed-point encoding decisions can significantly affect cost and performance. To evaluate their impact on accuracy, designers resort to simulations. Their high running-time prevents thorough exploration of the design-space. To address this issue, analytical modeling techniques have been proposed, but their applicability is limited by scalability issues. In this paper, we extend these techniques to a larger class of programs. We use polyhedral methods to extract a more compact, graph-based representation of the program. We validate our approach with a several image and signal processing algorithms.

关键词： embedded systems fixed point arithmetic floating point arithmetic graph theory signal processing analytical modeling techniques area cost constraints fixed-point arithmetic fixed-point conversion fixed-point encoding decisions floating-point conversion graph-based representation image processing algorithms polyhedral methods power constraints scalability issues scalable source level accuracy analysis signal processing algorithms Accuracy Arrays Convolution convolutional codes Equations Kernel Mathematical model Fixed-point arithmetic Embedded systems Signal processing algorithms floating point arithmetic Fixed point image processing algorithm convolutional coding Convolution Graph theory signal processing FLOATING POINTS Mathematical Model Kernel

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