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Performance comparison of a novel DFT-based method and conventional channel coding methods for clipping noise cancellation in OFDM systems

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IEICE TRANSACTIONS ON COMMUNICATIONS 2004年第4期E87B卷 1034-1036页

作者： Saeedi, H Azmi, P Marvasti, F Iran Telecommun Res Ctr Multimedia Res Grp Tehran Iran Carleton Univ Dept Elect & Comp Engn Ottawa ON K1S 5B6 Canada Tarbiat Modares Univ Dept Elect Engn Tehran Iran Sharif Univ Technol Dept Elect Engn Tehran Iran

A DFT-Based method (DBM) has been proposed to compensate for the performance degradation caused by clipping distortion at the expense of bandwidth expansion. On the other hand, in any communication systems, conventional channel coding methods can be employed to improve performance. In this letter, the performance of the DBM and the channel coding methods (CCM) are compared. Furthermore, we introduce a hybrid system which outperforms both the DBM and the CCM.

关键词： OFDM clipping distortion channel coding discrete Fourier transform

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RECENT RESULTS ON THE USE OF CONCATENATED REED-SOLOMON VITERBI channel coding AND DATA-COMPRESSION FOR SPACE COMMUNICATIONS

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IEEE TRANSACTIONS ON COMMUNICATIONS 1984年第5期32卷 518-523页

作者： LIU, KY LEE, JJ Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA

The development of sophisticated adaptive source coding algorithms together with inherent error sensitivity problems fostered the need for efficient space communication at very low bit error probilbilities (\leq 10^{-6}) . This led to the specification and implementation of a concatenated coding system using an interleaved Reed-Solomon code as the outer code and a Viterbi-decoded convolutionai code as the inner code. This paper presents the experimental results of this channel coding system under an emulated S -band uplink and X -band downlink two-way space communication channel, where both uplink and downlink have strong carrier power. Test results verify that at a bit error probability of 10 -6 or less, this concatenated coding system does provide a coding gain of 2.5 dB or more over the viterbi-decoded convolutional-only coding system. These tests also show that a desirable interleaving depth for the Reed-Solomon outer code is 8 or more. The imptict of this "virtually" error-free space communication link on the transmission of images is discussed and examples of Simulation results are given.

关键词： Concatenated codes Reed-Solomon codes Viterbi algorithm channel coding Data compression Convolutional codes Downlink Source coding Communication channels System testing

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Embedded physical-layer authentication in cognitive radio requires efficient low-rate channel coding schemes

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IET COMMUNICATIONS 2017年第3期11卷 400-404页

作者： Wu, Xiaofu Nanjing Univ Posts & Telecommun Key Lab Minist Educ Broadband Wireless Commun & Sensor Ne Nanjing 210003 Jiangsu Peoples R China

In this study, the author investigates the practical limitation of the recently proposed embedded cryptographic signature authentication scheme at the physical layer. By employing the log-likelihood ratio of a tag bit and its approximation, the author shows that the equivalent authentication channel observed by the secondary receiver can be viewed as a binary-input additive white Gaussian noise channel. Then, the sphere-packing lower bound can be employed to show the transmission capability for practical finite-length authentication tags. To achieve the same effective coverage area for both the primary and secondary receivers, it essentially requires efficient low-rate channel coding schemes with near sphere-packing-bound performance at the secondary receiver, which contrasts sharply with the pessimistic conclusion of Jiang et al.

关键词： AWGN channels radio receivers cryptography digital signatures cognitive radio channel coding embedded physical-layer authentication cognitive radio low-rate channel coding embedded cryptographic signature authentication physical layer log-likelihood ratio equivalent authentication channel secondary receiver binary-input additive white Gaussian noise channel sphere-packing lower bound transmission capability finite-length authentication tags primary receivers

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channel coding QoS Evaluation for 3GPP Sub-6GHz and mmWave 5G V2X Highway Communication Systems 7

Channel Coding QoS Evaluation for 3GPP Sub-6GHz and mmWave 5...

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7th International Conference on Algorithms, Computing and Systems, ICACS 2023

作者： Chatzoulis, Dimitrios Chaikalis, Costas Kosmanos, Dimitrios Anagnostou, Kostas Karetsos, George Lampsas, Petros Department of Digital Systems University of Thessaly Larissa Greece Department of Informatics & Telecommunications University of Thessaly Lamia Greece

ISBN: (纸本)9798400709098

Vehicle-to-everything (V2X) communications has gained a lot of interest in recent years and inevitably became part of the 5th-Generation New Radio (5G-NR) technologies, namely the sub-6GHz 5G and millimeter wave (mmWave) 5G. Also, the 3rd-Generation Partnership Project (3GPP) has defined reliability, end-to-end latency, data rate and range as the most important quality of service (QoS) parameters, which become crucial in highway propagation environments where the vehicles are moving at high speeds. These parameters are mostly improved by channel coding, which is a mechanism for limiting errors and improving the communication quality. Therefore, in this paper, we investigate the impact of use of 4th-Generation Long-Term Evolution (4G-LTE) turbo codes, 5G-NR polar codes and low-density parity-check codes (LDPC) in 5G V2X highway propagation environments and analyze the QoS parameters for both sub-6GHz 5G and mmWave 5G technologies. Our analysis shows that turbo-based coding schemes can be a future candidate for small data frame 5G V2X highway communications, since they present superior performance in most of the aforementioned QoS parameters. © 2023 Copyright held by the owner/author(s).

关键词： channel coding

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Managing Imperfect Spectrum Sensing in the Secondary Service: Increasing Sensing Time or Adopting channel coding?

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IEEE COMMUNICATIONS LETTERS 2013年第6期17卷 1232-1235页

作者： Haddadi, Sadjad Saeedi, Hamid Navaie, Keivan Tarbiat Modares Univ Dept Elect & Comp Engn Tehran Iran Univ Leeds Sch Elect & Elect Engn Leeds LS2 9JT W Yorkshire England

Imperfect spectrum sensing in overlay spectrum sharing may cause collision between primary and secondary transmission resulting in performance degradation for primary users. To satisfy the quality of service requirement imposed by the primary service, the maximum probability of collision has to be kept below a given threshold. The collision, if occurs, also results in increasing error rate in the secondary system. What can be done if the secondary service needs better error rate than the value imposed by the collision constraint in the primary network? From secondary user perspective, this can be taken care of by employing channel coding techniques at the expense of effective rate reduction. Alternatively, one can increase the sensing time to reduce the collision probability at the expense of reducing the data transmission time. This also reduces the effective data rate for secondary users. In this letter, we compare these two approaches and demonstrate a situation where using rate-compatible Low-Density Parity-Check codes, the effective data rate for the coded case can be significantly more than that of the case without channel coding while exhibiting a considerably better performance. We then discuss necessary condition for such an advantage and come up with cases where increasing sensing time is preferred over adopting channel coding.

关键词： Cognitive radio networks channel coding low-density parity-check codes energy detector

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Arithmetic coding algorithm with embedded channel coding

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ELECTRONICS LETTERS 1997年第20期33卷 1687-1688页

作者： Elmasry, GF New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA

A joint lossless-source and channel coding approach that incorporates error detection and correction capabilities in arithmetic coding is exploited. The encoded binary data representation allows the source decoder to recover the source symbols, even with channel errors. The self-synchronisation property of arithmetic coding, the knowledge of the source statistics, and some added redundancy are used for error detection and correction.

关键词： arithmetic codes channel coding algorithm theory

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channel coding for joint colour and depth segmentation

Channel coding for joint colour and depth segmentation

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Lecture Notes in Computer Science

作者： Wallenberg, Marcus Felsberg, Michael Forssén, Per-Erik Dellen, Babette Linköping University Linköping SE-581 83 Sweden Llorens i Artigas 4-6 Barcelona 08028 Spain

ISBN: (纸本)9783642231223

Segmentation is an important preprocessing step in many applications. Compared to colour segmentation, fusion of colour and depth greatly improves the segmentation result. Such a fusion is easy to do by stacking measurements in different value dimensions, but there are better ways. In this paper we perform fusion using the channel representation, and demonstrate how a state-of-the-art segmentation algorithm can be modified to use channel values as inputs. We evaluate segmentation results on data collected using the Microsoft Kinect peripheral for Xbox 360, using the superparamagnetic clustering algorithm. Our experiments show that depth gradients are more useful than depth values for segmentation, and that channel coding both colour and depth gradients makes tuned parameter settings generalise better to novel images. © 2011 Springer-Verlag.

关键词： channel coding

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Special Issue on Advances in channel coding

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JOURNAL OF COMMUNICATIONS AND NETWORKS 2015年第4期17卷 325-327页

作者： Arikan, Erdal Lentmaier, Michael Montorsi, Guido Univ Notre Dame Indiana PA USA Univ Ulm D-89069 Ulm Germany German Aerosp Ctr DLR Inst Commun & Nav Oberpfaffenhofen Germany Tech Univ Dresden Vodafone Chair Mobile Commun Syst Dresden Germany Tech Univ Dresden Algorithms & Coding Res Grp Dresden Germany Lund Univ Dept Elect & Informat Technol S-22100 Lund Sweden Politecn Torino I-10129 Turin Italy Rensselaer Polytech Inst Dept Elect Engn Troy NY USA Sequoia Commun Stanford CA USA

Since the invention of turbo codes in 1993 there has been an enormous interest and progress in the field of capacity approaching code constructions. Many classical constructions have been replaced by newer, better performing codes with feasible decoding complexity. Most of these modern code constructions, such as turbo codes, Gallager's low-density parity-check (LDPC) codes and their generalizations, can be modeled by sparse graphical models. Spatial coupling of sparse graphical models has in the last years attracted a lot of interest due to the threshold saturation phenomenon, which leads to capacity achieving performance with iterative message passing decoding. Polar codes are a recently discovered class of capacity achieving codes that are formed by an explicit construction based on a phenomenon called channel polarization. These codes, too, have various low-complexity decoding algorithms based on message passing on a sparse graph that has a recursive structure similar to that of fast transforms in signal processing.

关键词： channel coding Iterative decoding Signal processing algorithms Communication systems Algorithm design and analysis

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channel coding Challenges for Short and Moderate Block Lengths-based Applications

Channel Coding Challenges for Short and Moderate Block Lengt...

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2023 International Telecommunications Conference, ITC-Egypt 2023

作者： Tarek, Amr Abdelaziz, Amr Al-Dahshan, Hisham Communication Department Cairo Egypt

ISBN: (纸本)9798350326062

Advanced channel coding schemes have recently gained much interest due to their capacity-approaching behavior, rendering them a vital choice for many applications in commercial systems such as satellite standards and cellular communications networks. Furthermore, the low-density parity-check (LDPC) codes have already been chosen for user data in 5G New Radio (NR) systems since they provide high throughput and efficient error-correcting capabilities. In contrast, Polar in 5G NR is used for control information with enhanced mobile broadband (eMBB) and broadcast channels (BCH) since they can introduce an efficient decoding performance for short block lengths. Furthermore, LDPC is used in broadband satellite applications (DVB-S2) and DVB-S2 extensions (DVB-S2X), where LDPC and BCH codes are serially concatenated. This paper examines and addresses the merits of Polar and LDPC codes and their ability to adhere to the stringent requirements of satellite communications and the Ultra-Reliable and Low-Latency Communication (URLLC) applications. Moreover, simulation is performed to evaluate the performance of the LDPC and Polar codes used in 5G's eMBB for short and moderate block lengths. More specifically, the convergence behavior regarding the number of iterations (LDPC) and list size (polar) is studied. Additionally, the performance and computational complexity are evaluated with various Polar and LDPC decoding algorithms. © 2023 IEEE.

关键词： channel coding

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Joint lossless-source and channel coding using automatic repeat request

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IEEE TRANSACTIONS ON COMMUNICATIONS 1999年第7期47卷 953-955页

作者： Elmasry, GF New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA

The susceptibility of arithmetic coding to errors is utilized for channel error recovery using an automatic repeat request (ARQ) scheme. The presented scheme optimizes the tradeoff between the redundancy added to overcome channel errors and detection capability. With this approach, the type of error pattern introduced by the channel does not affect the receiver's detection capability. This scheme is suitable for transmitting long files over low bit error rate channels, and it provides the assurance of reconstructing the original data, free from catastrophic errors.

关键词： channel coding Automatic repeat request Decoding Arithmetic Redundancy Frequency Bit error rate Shift registers Propagation losses Communications Society

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