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检索条件"主题词=Channel coding"

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Joint Cache-channel coding over Erasure Broadcast channels 12

Joint Cache-Channel Coding over Erasure Broadcast Channels

引用

12th International Symposium on Wireless Communication Systems (ISWCS)

作者： Timo, Roy Wigger, Michele Tech Univ Munich D-80290 Munich Germany Telecom ParisTech Paris France

ISBN: (纸本)9781467365406

We consider a cache-aided communications system in which a transmitter communicates with many receivers over an erasure broadcast channel. The system serves as a basic model for communicating on-demand content during periods of high network congestion, where some content can be pre-placed in local caches near the receivers. We formulate the cache-aided communications problem as a joint cache-channel coding problem, and characterise some information-theoretic tradeoffs between reliable communications rates and cache sizes. We show that if the receivers experience different channel qualities, then using unequal cache sizes and joint cache-channel coding improves system efficiency.

关键词： channel coding

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How to combat long echoes in OFDM transmission schemes: Sub-channel equalization or more powerful channel coding

How to combat long echoes in OFDM transmission schemes: Sub-...

引用

IEEE Global Telecommunications Conference

作者： Viterbo, E Fazel, K INST COMMUN TECHNOL GERMAN AEROSP RES ESTABDLRD-82234 OBERPFAFFENHOFENGERMANY

ISBN: (纸本)0780325109

The OFDM technique with guard-time, which has been proposed for terrestrial digital image and digital audio broadcasting applications in Europe, is an interesting approach to combat the frequency selectivity of the channel. However, it is sensitive to the interference caused by echoes longer than the guard-time. The aim of this article is twofold. First, the effects of the guard interval on a real case multipath channel are analyzed for an OFDM transmission system. The system performance is analytically derived as a function of the guard interval. The sensitivity of the OFDM system to the interference caused by echoes exceeding the guard-time is analyzed. The degradation due to the interference can be restored by applying two different techniques: using more powerful channel coding or employing sub-channel equalization. For channel coding, a combination of multilevel coding with multiresolution modulation, which is proposed for a digital terrestrial TV broadcasting, is used. The sub-channel equalizer is based on the DFE, where its adaptation calls-upon the LMS-algorithm, using the reference symbols sent periodically. Simulation results show that using powerful channel coding, rather than equalization, can partly restore the degradation caused by a shorter guard-time.

关键词： channel coding frequency selectivity subchannel Echoes Equalization channel equalization Orthogonal frequency division multiplexing television broadcasting Multilevel coding Transmission systems Fighter

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Design of an Indoor Wireless Optical Transceiver System with Source and channel coding

Design of an Indoor Wireless Optical Transceiver System with...

引用

IEEE Symposium on Industrial Electronics and Applications (ISIEA)

作者： Kho, Yau Hee Yong, Lisa Lau, Khai Ling Kiu, Kwong Ping Swinburne Univ Technol Sch Engn Comp & Sci Kuching 93350 Sarawak Malaysia

ISBN: (纸本)9781467330053;9781467330046

A prototype indoor wireless optical transceiver system that uses LED as transmitting light source has been designed and developed. This wireless optical transceiver system can transmit ASCII-coded data for a distance up to 50 meters, and achieve a data rate of 230.4kbps. Huffman source coding with variable code words length is implemented as a compression technique so that data redundancy is minimised and spectral efficiency increased, and channel error-correction coding using Hamming linear block codes is implemented to counter the effect of noise during transmission.

关键词： wireless communications free space optics optical communications source coding channel coding

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A channel coding Approach for Random Access Communication with Bursty Sources

A Channel Coding Approach for Random Access Communication wi...

引用

2010 IEEE International Symposium on Information Theory

作者： Luo, Jie Ephremides, Anthony Colorado State Univ Dept Elect & Comp Engn Ft Collins CO 80523 USA Univ Maryland Dept Elect & Comp Engn College Pk MD 20742 USA

ISBN: (纸本)9781424469604

We extend Information Theoretic analysis to time-slotted packet random access communication with bursty sources. A new channel coding approach for coding within each packet is proposed with built-in support for bursty sources phenomena, such as message underflow, and for random access mechanisms, such as packet collision detection. The coding approach does not require joint communication rate determination either between the transmitters or between the transmitters and the receiver. Its performance limitation is characterized by an achievable region defined in terms of communication rates, such that reliable packet recovery is supported for all rates within the region and reliable collision detection is supported for all rates outside the region. For random access communication over a discrete-time memoryless channel using a class of random coding schemes, it is shown that the maximum achievable rate region of the introduced coding approach equals the Shannon information rate region without a convex hull operation.

关键词： channel coding

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Graph-Based Analog Joint Source channel coding for 3D Haptic Communication 59

Graph-Based Analog Joint Source Channel Coding for 3D Haptic...

引用

59th Annual IEEE International Conference on Communications (IEEE ICC)

作者： Fujihashi, Takuya Koike-Akino, Toshiaki Corcodel, Radu Osaka Univ Grad Sch Informat & Sci Osaka Japan Mitsubishi Elect Res Labs MERL Cambridge MA 02139 USA

ISBN: (纸本)9781728190549

Haptic communication will be a key technology for extended reality (XR), robotics, and remote manipulation. The deformation magnitude of 3D deformable objects is a key attribute for realizing fine-grained remote manipulation. The typical solutions for sending the deformation magnitudes over wireless channels are to perform digital compression and transmission considering the channel quality, i.e., digital source-channel coding. However, the key problems of the solutions are 1) still large traffic and 2) catastrophic quality degradation due to channel quality fluctuation. This paper proposes a graph-based analog joint source-channel coding for 3D haptic communication. Specifically, Graph Fourier Transform (GFT)-based energy compression efficiently removes the redundancy across deformation magnitudes. In addition, the integration of unequal error protection and analog modulation prevents catastrophic degradation and gradually improves the reconstruction quality according to the instantaneous channel quality. Evaluation results using the deformation magnitude of various 3D objects show that the proposed scheme prevents quality degradation due to channel quality fluctuations and provides accurate deformation magnitude for remote users.

关键词： channel coding

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Joint channel coding Network coding for Multi-Way Relay Systems

Joint Channel Coding Network Coding for Multi-Way Relay Syst...

引用

SAI Computing Conference (SAI)

作者： Liu, William Imperial Coll London Dept Elect & Elect Engn London England

ISBN: (纸本)9781467384605

Physical layer network coding (PNC) with channel coding is a strategy that applies error correction at the relay nodes of a relay system to improve data communication reliability of the whole relay system. So far, channel coded PNC schemes have been studied for two-way relay systems, but have not been systematically proposed for general multiple-way relay systems. In this paper, joint channel coding network coding schemes (JCCNC) are proposed for compute-and-forward (CF) relaying scheme that is able to be applied to general types of PAM and QAM modulation systems. LDPC codes are used for channel coding. Numerical results from simulation show that these JCCNC schemes greatly improve the performance of the relay systems.

关键词： channel coding compute-and-forward lattice coding LDPC code multi-way relay PNC

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Source-channel coding Tradeoff in Multiple Antenna Multiple Access channels

Source-Channel Coding Tradeoff in Multiple Antenna Multiple ...

引用

IEEE International Symposium on Information Theory (ISIT)

作者： MolavianJazi, Ebrahim Laneman, J. Nicholas Univ Notre Dame Dept Elect Engn Notre Dame IN 46556 USA

ISBN: (纸本)9781457705953

We investigate channel code rates for communication of finite-dimensional analog sources over a multiple-antenna multiple access channel (MAC) so that the average end-to-end distortions are minimized. Our analysis uses the high-resolution quantization theory for the sources and the high-SNR diversity-multiplexing tradeoff for the MAC. We prove that carefully balanced channel coding rates, usually far from the boundary of the MAC capacity region, are necessary to achieve the optimal distortion exponent in a separated architecture. In particular, for the case of source vectors of equal dimension, we show that the channel interference from multiple users becomes crucial in characterizing the optimal channel coding rates if individual minimization of distortion for each user leads to a heavily loaded regime for the MAC.

关键词： channel coding Fading Multiplexing Receiving antennas Signal to noise ratio Time division multiple access antennas channel code rates combined source-channel coding diversity reception diversity-multiplexing tradeoff finite-dimensional analog sources multidimensional systems multiple antenna multiple access channels source-channel coding tradeoff

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Two-way joint source-channel coding with a fidelity criterion

Two-way joint source-channel coding with a fidelity criterio...

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IEEE International Symposium on Information Theory

作者： Maor, A Merhav, N Technion Israel Inst Technol Dept Elect Engn IL-32000 Haifa Israel

ISBN: (纸本)0780391500

Consider a source, {X-i, Y-i,}(i=1)(infinity), producing independent copies of a pair of jointly distributed RVs. The {X-i} part of the process is observed at some location, say A, and is supposed to be reproduced at a different location, say B, where the (Yi} part of the process is observed. Similarly, {Y-i} should be reproduced at location A. The communication between the two locations is carried out across two memoryless channels in K iterative bidirectional rounds. In each round, the source components are reconstructed at the other locations based on the information exchanged in all previous rounds and the source component known at that location, and it is desired to find the amount of information that should be exchanged between the two locations in each round, so that the distortions incurred (in each round) will not exceed given thresholds. We first derive a single-letter characterization of achievable rates for a pure source-coding problem with successive refinement. Then, for a joint source-channel coding setting, we prove a separation theorem, asserting that in the limit of long blocks, no optimality is lost by first applying lossy (two-way) successive-refinement source coding, regardless of the channels, and then applying good channel codes to each one of the resulting bitstreams, regardless of the source.

关键词： combined source-channel coding memoryless systems telecommunication channels fidelity criterion memoryless channels separation theorem successive-refinement source coding two-way joint source-channel coding Combined source-channel coding Memoryless channel memoryless systems Rounding off Bidirectional channel coding source coding

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Systematic Polar Codes for Joint Source-channel coding in Wireless Sensor Networks and the Internet of Things

Systematic Polar Codes for Joint Source-Channel Coding in Wi...

引用

14th International Conference on Mobile Systems and Pervasive Computing (MobiSPC) / 12th International Conference on Future Networks and Communications (FNC)

作者： Yaacoub, Charles Sarkis, Malak Holy Spirit Univ Kalsik USEK Dept Telecommun Fac Engn POB 446 Jounieh Lebanon NH USA

The Internet of Things (IoT) is becoming an increasingly growing topic of interest in the research community. Its requirements meet those of the next generation 5G mobile communication system which is expected to be an enabling technology for IoT, where networks of large numbers of sensors require massive connectivity demands. As polar codes have strongly entered into action within the standardization of 5G, this paper proposes and investigates the use of systematic polar codes for joint-source channel coding of correlated sources thus allowing, on one hand, the compression of the volume of data to be transmitted over the network, and on the other hand, the protection of this data from channel impairments. Results show that systematic polar codes can achieve a distributed compression with rates close to the theoretical bound, with better error rates obtained for larger blocks. However, stronger compression and shorter block lengths allow for a better robustness against transmission errors. (C) 2017 The Authors. Published by Elsevier B.V.

关键词： channel coding compression distributed source coding entropy internet of things systematic polar codes wireless sensor networks

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Fault-tolerant multipath transportation aided with channel coding and interleaver for wireless sensor networks

Fault-tolerant multipath transportation aided with channel c...

引用

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

作者： Liang, QL Wang, LM Univ Texas Dept Elect Engn Arlington TX 76019 USA

ISBN: (纸本)0780385233

In wireless sensor networks, the bandwidth and energy are limited, and some link failures may happen during data transmission. In this paper, we propose a fault tolerant Multipath Transportation Aided with channel coding and Interleaver (MTACCI) scheme for Wireless Sensor Networks. Simulation results show that this scheme works much better than the dual transportation scheme in static channel and diversity combining scheme in fading channel when link failures exist. Further analysis demonstrates that this scheme can solve the bandwidth and energy constraint problems, and makes wireless sensor networks survivable and resilient.

关键词： wireless sensor networks multipath transportation fault tolerant channel coding channel fading

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