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检索条件"主题词=error correction coding"

共 278 条记录，以下是151-160 订阅

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Improving Characteristics of Tropospheric Communication Systems 1

Improving Characteristics of Tropospheric Communication Syst...

引用

1st International Scientific-Practical Conference on Problems of Infocommunications Science and Technology (PIC S&T)

作者： Popovskiy, Vladimir Loshakov, Valeriy Marchuk, Artem Kharkiv Natl Univ Radio Elect Telecommun Syst Dept Kharkov Ukraine

This paper analyzes the modern ways to improve reliability and capacity troposcatter communications systems based on using error-correction coding, spatial diversity, adaptive multi-position modulation and digital pro... 详细信息

ISBN: (纸本)9781479973422

关键词： tropospheric communication energy gain spatial diversity digital wavelet processing error correction coding adaptive modulation

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Simultaneous laser ranging and communication from an Earth-based satellite laser ranging station to the Lunar Reconnaissance Orbiter in lunar orbit

Simultaneous laser ranging and communication from an Earth-b...

引用

Conference on Free-Space Laser Communication and Atmospheric Propagation XXV

作者： Sun, Xiaoli Skillman, David R. Hoffman, Evan D. Mao, Dandan McGarry, Jan F. Neumann, Gregory A. McIntire, Leva Zellar, Ronald S. Davidson, Frederic M. Fong, Wai H. Krainak, Michael A. Zuber, Maria T. Smith, David E. NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)9780819493798

We report a free space laser communication experiment from the satellite laser ranging (SLR) station at NASA Goddard Space Flight Center (GSFC) to the Lunar Reconnaissance Orbiter (LRO) in lunar orbit through the on board one-way Laser Ranging (LR) receiver. Pseudo random data and sample image files were transmitted to LRO using a 4096-ary pulse position modulation (PPM) signal format. Reed-Solomon forward error correction codes were used to achieve error free data transmission at a moderate coding overhead rate. The signal fading due to the atmosphere effect was measured and the coding gain could be estimated.

关键词： Laser range finder lidar free-space optical communication error correction coding

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A Tight Estimation of the Security Gap over the Fast Fading Wiretap Channel

A Tight Estimation of the Security Gap over the Fast Fading ...

引用

9th International Wireless Communications and Mobile Computing Conference (IWCMC)

作者： Baldi, Marco Bianchi, Marco Maturo, Nicola Chiaraluce, Franco Univ Politecn Marche DII Ancona Italy

ISBN: (纸本)9781467324809

In this paper, we provide a tight estimation of the security gap for the wiretap channel with fast Rayleigh fading. The error rate has already been used as a practical physical layer security metric, and the security gap has been defined to exploit such a metric over the wiretap channel with additive white Gaussian noise. We study two different approaches for estimating the security gap also over a fast fading wiretap channel. The first approach is quite conservative, and tends to overestimate the security gap. The second approach instead allows to perform a more realistic evaluation, and to highlight the gain achievable through information scrambling and coding, even when both the legitimate receiver and the eavesdropper channels are known only in statistical terms.

关键词： Security gap estimation fast fading wiretap channel physical layer security scrambling error correction coding

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An Integrated Signaling-Encryption Mechanism to Reduce error Propagation in Wireless Communications: Performance Analyses

An Integrated Signaling-Encryption Mechanism to Reduce Error...

引用

IEEE International Workshop Technical Committee on Communications Quality and Reliability

作者： Olama, Mohammed M. Matalgah, Mustafa M. Bobrek, Miljko Oak Ridge Natl Lab Computat Sci & Engn Div Oak Ridge TN 37831 USA Oak Ridge Natl Lab Elect & Elect Syst Res Div Oak Ridge TN 37831 USA Univ Mississippi Dept Elect Engn University MS 38677 USA

ISBN: (纸本)9781479985753

Traditional encryption techniques require packet overhead, produce processing time delay, and suffer from severe quality of service deterioration due to fades and interference in wireless channels. These issues reduce the effective transmission data rate ( throughput) considerably in wireless communications, where data rate with limited bandwidth is the main constraint. In this paper, performance evaluation analyses are conducted for an integrated signaling-encryption mechanism that is secure and enables improved throughput and probability of bit-error in wireless channels. This mechanism eliminates the drawbacks stated herein by encrypting only a small portion of an entire transmitted frame, while the rest is not subject to traditional encryption but goes through a signaling process ( designed transformation) with the plaintext of the portion selected for encryption. We also propose to incorporate error correction coding solely on the small encrypted portion of the data to drastically improve the overall bit-error rate performance while not noticeably increasing the required bit-rate. We focus on validating the signaling-encryption mechanism utilizing Hamming and convolutional error correction coding by conducting an end-to-end system-level simulation-based study. The average probability of bit-error and throughput of the encryption mechanism are evaluated over standard Gaussian and Rayleigh fading-type channels and compared to the ones of the conventional advanced encryption standard (AES).

关键词： cryptography quality of service (QoS) throughput bit-error rate error correction coding Rayleigh fading advanced encryption standard (AES) Monte Carlo simulations

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BIDIRECTIONAL INTERLEAVERS FOR LDPC DECODERS USING TRANSMISSION GATES

BIDIRECTIONAL INTERLEAVERS FOR LDPC DECODERS USING TRANSMISS...

引用

IEEE Workshop on Signal Processing Systems (SiPS 2009)

作者： Cushon, Kevin Gross, Warren J. Mannor, Shie McGill Univ Dept Elect & Comp Engn Montreal PQ Canada

ISBN: (纸本)9781424443345

Low-density parity check (LDPC) codes are used for forward error correction in several state-of-the-art and upcoming communications standards. This paper presents a new interleaver architecture for LDPC decoders, especially suitable for multi-mode codes such as IEEE 802.16e (WiMAX) and IEEE 802.1 In (Wi-Fi), that utilizes a bidirectional datapath and shuffle network composed of transmission gates. An implementation of this architecture for IEEE 802.1 In achieves 28% area reduction and similar throughput compared to a unidirectional reference design.

关键词： Parallel architectures error correction coding decoding very-large-scale integration

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Remote Reinforcement Learning over a Noisy Channel

Remote Reinforcement Learning over a Noisy Channel

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IEEE Global Communications Conference (GLOBECOM) on Advanced Technology for 5G Plus

作者： Roig, Joan S. Pujol Gunduz, Deniz Imperial Coll London Dept Elect & Elect Engn London England Samsung Elect R&D Inst UK Staines TW18 4QE Surrey England

ISBN: (纸本)9781728182988

A collaborative multi-agent reinforcement learning (RI) problem is considered, where agents communicate over a noisy communication channel towards achieving a common goal. In particular, we consider a remote-controlled version of a single-agent RL problem, in which the system state is observed by a guide agent, while the actions arc taken by a scout. The guide can communicate to the scout over a noisy communication link, reminiscent of a remote-controlled version of the single-agent RI problem. This transformation turns the original single-agent Markov decision process (MDP) into a two-agent partially observable MDP (POMDP). In conventional systems, communication and learning tasks are taken care of separately. We show the suboptimality of this approach, and propose a deep Q-learning solution that aims at learning the optimal policy taking into account the channel impairments.

关键词： Reinforcement learning learn to communicate deep Q-learning error correction coding

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Lower bounds on the existence of binary error-correcting variable-length codes

Lower bounds on the existence of binary error-correcting var...

引用

IEEE Information Theory Workshop

作者： Lamy, C Bergot, FX THALES Commun France Gennevilliers France

ISBN: (纸本)0780377990

This paper deals with codes that combine source and channel encoding operations. After discussing the potential usefulness of these variable-length error correcting (VLEC) codes, necessary conditions on their length distribution are established. It is shown that, depending on the targetted application, several families of VLEC codes can be defined, whose conditions of existence differ.

关键词： variable-length error-correcting codes variable-length codes error correction coding joint source-channel coding bounding methods

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A secure and robust approach to scalable video authentication

A secure and robust approach to scalable video authenticatio...

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4th International Conference on Multimedia and Expo (ICME 2003)

作者： Sun, QB He, DJ Zhang, ZS Tian, Q Inst Infocomm Res I2R Singapore 119613 Singapore

ISBN: (纸本)0780379659

In this paper, we present a secure and robust content authentication scheme for scalable video streaming. In our authentication scheme we consider three common video transcoding methods as acceptable content manipulations, when the streaming bit-rate needs to be reduced, namely frame resizing, frame dropping and multi-cycle coding. By employing error correction coding (ECC) in different ways, the proposed scheme is insensitive to those incidental distortions introduced during the transcoding (i.e., robust) while is still sensitive to other intentional distortions such as frame alterations and insertion (i.e., secure). One key feature in our scheme is that it achieves an end-to-end authentication independent of transcoding infrastructure and obtains a good compromise between system robustness and security.

关键词： scalable video authentication watermarking digital signature error correction coding

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Non-Binary Coded Modulation and Iterative Detection for High Spectral Efficiency in MIMO

Non-Binary Coded Modulation and Iterative Detection for High...

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46th Asilomar Conference on Signals, Systems and Computers

作者： Chang, Nicholas B. Romero, David L. MIT Lincoln Lab Lexington MA 02420 USA

ISBN: (纸本)9781467350518

Non-binary low density parity check codes (LDPC) have been shown to outperform their binary counterparts and attain the best-known performance among error-correction codes. At the same time, it has also been established that wireless communication using multiple-input multiple-output (MIMO) schemes dramatically increases system capacity and reliability when information symbols are appropriately coded and modulated across transmit antennas. Recent works have studied techniques for applying non-binary LDPC codes to MIMO systems and demonstrated near-capacity performance. However, the constellation sizes in the proposed approaches are limited by the Galois field (GF) size of the non-binary LDPC code, thus limiting the maximum spectral efficiency of the proposed joint modulation-coding approaches. In practice, the GF size may be limited by computational complexity reasons but high spectral efficiencies are desired. Thus, we study iterative coded modulation based techniques for applying non-binary LDPC codes to higher order modulations. These methods have been well-studied for binary codes but not for non-binary codes. It is demonstrated that performance of the technique is dependent on the mapping of GF symbols to constellations, but applying the appropriate mapping attains near-capacity performance. To reduce the error floor region for smaller field sizes, while maintaining steep waterfall curves, we combine a nonbinary-based accumulator with a parallel concatenated coding scheme.

关键词： error correction coding nonbinary low-density parity-check space-time coding multiple-input multiple-output (MIMO) iterative detection factor graph belief propagation

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Joint Source Channel coding with Hermitian Symmetric DFT Codes

Joint Source Channel Coding with Hermitian Symmetric DFT Cod...

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International Symposium on Circuits and Systems Nano-Bio Circuit Fabrics and Systems (ISCAS 2010)

作者： Kumar, A. Anil Makur, Anamitra Nanyang Technol Univ Sch Elect & Elect Engn Singapore Singapore

ISBN: (纸本)9781424453092

This paper considers the joint source channel coding using a new class of DFT codes which we refer to as Hermitian symmetric DFT (HSDFT) codes. A new decoding algorithm for decoding of HSDFT codes is presented. With this new decoding algorithm and an appropriate transmission scheme, HSDFT codes are capable of correcting more burst errors than the capacity of any maximum distance separable (MDS) code. Experimental results obtained by transmission of image over binary symmetric channel and Gilbert-Elliot channel are also presented, which show that HSDFT codes perform similar to the existing DFT class of codes on a binary symmetric channel while it performs consistently better (by around 2dB) on a Gilbert-Elliot like channel.

关键词： error correction coding joint source channel coding DFT codes subspace algorithms

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