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IEEE Wireless Communications and Networking Conference (IEEE WCNC)

作者： Xu, Chao Wang, Jessie Hui Xie, Shilin Wang, Jilong Tsinghua Univ Inst Network Sci & Cyberspace BNRist Beijing Peoples R China Zhongguancun Lab Beijing Peoples R China

ISBN: (纸本)9798350303582;9798350303599

Forward Error Correction (fec) is the preferred method for recovering lost packets in time-sensitive applications. However, setting the code rate to adapt to changing network environment is still a significant but challenging problem. Recently, researchers explored deep learning (DL) methods to solve this problem, but DL-based methods come with increased computation overhead and decision-making latency compared to traditional methods, which may make these methods infeasible or less effective. Thus, real-time network (RTN) providers usually have trouble with these two questions when considering whether to adopt a DL-based method: (1). How much additional computing resources are required by each DL-based method? (2). If resource competition occurs, can these DL-based methods be able to make timely code rate decisions? In this paper, we evaluate existing proposed DL-based methods for code rate determination in terms of computational cost to answer these two questions. Particularly, we measure the computational resources and the time required by these DL-based methods for making one code rate decision. We find that among existing DL-based methods, some methods require several times or even tens of times more computational resources to achieve timely decision-making. Furthermore, we identify that three methods are prone to resource competition with existing fec schemes, which indicates that RTN providers need to configure their computing resources carefully when selecting these methods. We further analyze the reasons behind this phenomenon and provide some design suggestions for RTN providers.

关键词： fec coding RTN provider Computational cost Code rate determination Deep-learning based method

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The Problems of Digital TV and Radio Broadcasting Systems Implementation

The Problems of Digital TV and Radio Broadcasting Systems Im...

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17th International Conference on Distributed Computer and Communication Networks (DCCN)

作者： Dvorkovich, Viktor P. Dvorkovich, Alexander V. Bauman Univ Moscow Russia Moscow Power Engn Inst Moscow Russia

ISBN: (纸本)9783319052090;9783319052083

Implementation of digital broadcasting systems requires the solution of a set of problems, including national and international standardization, advances in video and channel coding, measurement methods and equipment for broadcasting systems. Different systems could be effective for highly populated and sparsely inhabited regions. New digital terrestrial multimedia broadcasting system may solve such problems. Some key characteristics of the RAVIS system are presented and the prospects of the system are discussed.

关键词： Digital broadcasting Multiplex Video coding Metrology fec coding QEF

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Using DVB-S2 Over Asymmetric Heterogeneous Optical to Radio Frequency Satellite Links

Using DVB-S2 Over Asymmetric Heterogeneous Optical to Radio ...

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MILCOM Military Communications Conference

作者： Shoup, Ryan List, Nancy Fletcher, Andrew Royster, Thomas MIT Lincoln Lab Lexington MA 02420 USA

ISBN: (纸本)9781424481804

The DVB-S2 coding standard has seen widespread use in many radio frequency (RF) communications applications. The availability of commercial-off-the-shelf (COTS) intellectual property (IP) that can be used to rapidly prototype and field communications systems makes this well-performing, standards-based approach to forward error correction (fec) coding extremely attractive. In this paper, we evaluate the application of the DVB-S2 coding standard to an asymmetric satellite communications channel. The uplink comprises a fading optical link employing binary differential phase-shift keyed (DPSK) modulation, while the downlink comprises an RF link employing 16-ary amplitude and phase shift keyed (16-APSK) modulation. To simplify the payload implementation, hard-decision uplink demodulation is considered with uplink channel state information transmitted on the downlink for soft-decision decoding in the ground-based receiver. Additionally, we outline many of the trade offs in the overall system design, and some performance results of a baseline design are presented.

关键词： 16-ary amplitude and phase shift keyed modulation DPSK DVB-S2 coding standard fec coding asymmetric heterogeneous optical to radio frequency satellite links commercial-off-the-shelf intellectual property differential phase shift keying differential phase-

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Space-Time Linear Precoding and Iterative LMMSE Detection for MIMO Channels without CSIT

Space-Time Linear Precoding and Iterative LMMSE Detection fo...

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IEEE International Symposium on Information Theory (ISIT)

作者： Yuan, Xiaojun Ping, Li City Univ Hong Kong Dept Elect Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781457705953

We propose a space-time coding scheme for efficient transmission over multiple-input multiple-output (MIMO) channels without channel state information at the transmitter (CSIT). The proposed scheme involves linear precoding (LP) at the transmitter and iterative linear minimum mean-square error (LMMSE) detection at the receiver. We develop a procedure to jointly optimize the forward-error-control (fec) coding and LP, taking into consideration of the iterative detection process. Our analysis shows that the proposed scheme can perform close to the outage capacity of MIMO channels.

关键词： Encoding fec coding Interference Iterative decoding LP MIMO MIMO channels MIMO communication Receivers Signal to noise ratio forward error control coding iterative LMMSE detection iterative linear minimum mean square error detection iterative methods least mean squares methods linear codes multiple-input multiple-output channels outage capacity precoding signal detection space-time codes space-time coding scheme space-time linear precoding wireless channels

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A Novel and Blind Detection Scheme For Asymmetric PCMA System 3

A Novel and Blind Detection Scheme For Asymmetric PCMA Syste...

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3rd International Conference on Computer Science and Network Technology (ICCSNT)

作者： Mo, Ping-hua Fan, Xiao-xing You, Ling Southwest Elect & Telecommun Technol Res Inst Chengdu Peoples R China

ISBN: (纸本)9781479905614

A novel and blind detection scheme for the asymmetric Paired Carrier Multiple Access (PCMA) satellite communication system is proposed in the paper. Recently, the asymmetric application mode of PCMA, which is efficient and pragmatic in the VSAT network, has been studied with great interest. In our research, the symbol interference cancellation and Forward Error Correction (fec) coding are introduced to remove the influence on the detection of weak signal instead of reconstructing the big carrier. As shown in the simulation results, the proposed scheme performs well at the low Signal to Noise Ratios (SNR) scenario which is typical in the asymmetric PCMA systems.

关键词： asymmetric PCMA symbol interference cancellation fec coding

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Comment on "error rate performance of the projection code" - Authors' reply

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IEEE TRANSACTIONS ON COMMUNICATIONS 1998年第5期46卷 575-575页

作者： Li, D Yang, G Schilling, DL AT&T Bell Labs Holmdel NJ 07733 USA NEC Amer Inc Irving TX 75038 USA Golden Bridge Technol Inc W Long Branch NJ 07764 USA

The optimum choice of the slopes used to perform the encoding process in a projection code always results in maximizing the minimum Hamming distance so that d = 2(r).

关键词： fec coding

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Low rate channel coding for CDMA systems

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2000年第6期54卷 353-363页

作者： Kühn, V Dekorsy, A Kammeyer, KD Univ Bremen Dept Commun Engn D-28359 Bremen Germany T Nova DeutschTelekom Innovationsgesell mbH Technologiezentrum D-64295 Darmstadt Germany

This paper investigates aspects of channel coding in CDMA systems where each user occupies a bandwidth much larger than the information bit rate. This inherent bandwidth expansion requires the application of powerful low rate codes with low decoding complexity. In this context, three different coding strategies are under consideration: the combination of convolutional and repetition codes, the code-spread system consisting of a single very low rate convolutional code and finally a serial concatenation of convolutional, Walsh-Hadamard and repetition code. The latter scheme will be iteratively decoded whereas the other two schemes can be maximum likelihood decoded. Analytical and simulation results turn out that the Walsh-Hadamard coded system is the best choice among the considered scenarios for low up to medium system load. Besides these investigations, single- and multi-carrier CDMA are compared when powerful low rate coding is applied. It is shown that only minor differences can be observed between the two concepts.

关键词： OFDM-CDMA SC-CDMA fec coding concatenated codes iterative decoding turbo decoding

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A Novel and Blind Detection Scheme For Asymmetric PCMA System

A Novel and Blind Detection Scheme For Asymmetric PCMA Syste...

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International Conference on Computer Science and Network Technology

作者： Ping-hua Mo Xiao-xing Fan Ling You Southwest Electron. & Telecommun. Technol. Res. Inst. Chengdu China

ISBN: (纸本)9781479905607

关键词： error correction codes interference suppression multi-access systems satellite ground stations signal detection fec coding SNR scenario VSAT network asymmetric PCMA system asymmetric paired carrier multiple access blind detection scheme forward error correction coding satellite communication system signal to noise ratios symbol interference cancellation weak signal detection Decoding Demodulation Encoding Forward error correction Signal to noise ratio Timing asymmetric PCMA

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