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interleaved coding and sequential transmission scheme for packet-level forward error correction over burst loss channels

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2017年第18期30卷 n/a-N.PAG页

作者： Weng, Yung-Tsung Shih, Chi-Huang Chou, Yeh-Kai Far East Univ Dept Comp Sci & Informat Engn Tainan Taiwan Hung Kuang Univ Dept Comp Sci & Informat Engn Taichung Taiwan Ind Technol Res Inst Div Network Based Serv Technol Informat & Commun Res Labs Hsinchu Taiwan

Burst packet loss is a common problem over wired and wireless networks and leads to a significant reduction in the performance of packet-level forward error correction (FEC) schemes used to recover packet losses during transmission. Traditional FEC interleaving methods adopt the sequential coding-interleaved transmission (SCIT) process to encode the FEC packets sequentially and reorder the packet transmission sequence. Consequently, the burst loss effect can be mitigated at the expense of an increased end-to-end delay. Alternatively, the reversed interleaving scheme, namely, interleaved coding-sequential transmission (ICST), performs FEC coding in an interleaved manner and transmits the packets sequentially based on their generation order in the application. In this study, the analytical FEC model is constructed to evaluate the performance of the SCIT and ICST schemes. From the analysis results, it can be observed that the interleaving delay of ICST FEC is reduced by transmitting the source packets immediately as they arrive from the application. Accordingly, an Enhanced ICST scheme is further proposed to trade the saved interleaving time for a greater interleaving capacity, and the corresponding packet loss rate can be minimized under a given delay constraint. The simulation results show that the Enhanced ICST scheme achieves a lower packet loss rate and a higher peak signal-to-noise-ratio than the traditional SCIT and ICST schemes for video streaming applications.

关键词： burst loss channel forward error correction interleaved coding interleaving delay sequential transmission

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coding Performance of Non-interleaved Non-Memoryless Optical Wireless Channels

Coding Performance of Non-Interleaved Non-Memoryless Optical...

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IEEE International Conference on the Science of Electrical Engineering (ICSEE)

作者： Bykhovsky, Dima Cohen, Dor Benafsha, Dor Sami Shamoon Coll Engn Dept Elect & Elect Engn Beer Sheva Israel

ISBN: (纸本)9781509021529

Over the last two decades there has been increasing interest in a free-space optical communication (FSO) as a backup or alternative to radio frequency communication. The main disadvantage of FSO through the atmosphere is related to time-varying turbulence-induced changes in the channel. Theoretical coding error performance analysis of such channels is challenging due to the complicated multidimensional integration that is required. In this paper, the coding error performance is analyzed using simulations with a recent non-memoryless optical channel simulator. The simulation results confirm theoretical analysis and show almost negligible influence of the channel memory on coding performance.

关键词： free-space optical communication non-memoryless channel interleaved coding Hamming codes repetitive coding turbulence

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Multilevel Reed-Solomon Codes for PMR Channels

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IEEE TRANSACTIONS ON MAGNETICS 2016年第2期52卷 1-8页

作者： Demirkan, Ismail Silvus, Gregory Istanbul Sehir Univ TR-34662 Istanbul Turkey Broadcom Corp Longmont CO 80503 USA

Reed-Solomon (RS) codes are commonly utilized in magnetic recording systems to correct error bursts. A soft-output Viterbi algorithm (SOVA) is a commonly used detector to provide soft information to error-correcting decoders. We propose a novel architecture of a multilevel interleaved RS coding scheme that not only provides better performance but also has less complexity than an equivalent RS code. This architecture implements an error event detector using the soft information generated by the SOVA detector. The performance and complexity of the decoding technique are compared with the well-known soft-decoding techniques, such as generalized minimum distance decoding and Chase decoding techniques.

关键词： Chase decoding error-correction coding generalized minimum distance (GMD) decoding interleaved coding multilevel coding perpendicular magnetic recording (PMR) Reed-Solomon (RS) codes soft-output Viterbi algorithm (SOVA)

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An analytical approach to evaluate service coverage in slow frequency-hopping mobile radio systems

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IEEE TRANSACTIONS ON COMMUNICATIONS 2001年第8期49卷 1447-1456页

作者： Chiani, M Agrati, E Andrisano, O Univ Bologna DEIS CSITE I-40136 Bologna Italy Siemens ICN SPA I-20092 Cinisello Balsamo MI Italy

The performance of a time-division multiple-access mobile radio system adopting slow frequency hopping is analyzed by following an original procedure that allows the evaluation of thermal noise and fast fading (e.g., Rayleigh) effects on block-coded transmission with nonideal interleaving. Starting from this approach, service coverage can be analytically evaluated when the "slow" disturbances affecting the transmission are fixed. The method proposed is able to take several impairments and parameters into account, such as shadowing and discontinuous transmission. The experimental results confirmed the validity of the theoretical approach.

关键词： fading channels frequency-hop communications interleaved coding mobile communication

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Achievable Capacity of Geostationary-Ground Optical Links

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2023年第12期41卷 3717-3725页

作者： Boddeda, Rajiv Arrieta, Daniel Romero Almonacil, Sylvain Renaudier, Jeremie Bigo, Sebastien Nokia Bell Labs F-91300 Massy France Paris Saclay Univ Saint Aubin France

We estimate the capacity of optical links at telecom wavelengths built upon existing terrestrial technologies. We study the impact of molecular absorption while varying the modulation scheme and compare the result with the ultimate capacity achievable in void. We then investigate the impact of atmospheric turbulence and evaluate how much capacity we recover with current mitigation techniques such as adaptive optics, and data coding coupled with delay diversity or data interleaving. We conclude by evaluating the achievable capacity in the presence of molecular absorption and atmospheric turbulence.

关键词： Index Terms-Adaptive optics interleaved coding optical communication satellite communication signal processing

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Design and analysis of turbo codes on Rayleigh fading channels

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 1998年第2期16卷 160-174页

作者： Hall, EK Wilson, SG Univ Virginia Dept Elect Engn Charlottesville VA 22903 USA

The performance and design of turbo codes using coherent BPSK signaling on the Rayleigh fading channel is considered. In low signal-to-noise regions, performance analysis uses simulations of typical turbo coding systems. For higher signal-to-noise regions beyond simulation capabilities, an average upper bound is used in which the average is over all possible interleaving schemes. Fully interleaved and exponentially correlated Rayleigh channels are explored. Furthermore, the design issues relevant to turbo codes are examined for the correlated fading channel. Turbo interleaver design criteria are developed and architectural modifications are proposed for improved performance.

关键词： codes concatenated coding fading channels interleaved coding Rayleigh channels

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Trellis codes for periodic erasures

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IEEE TRANSACTIONS ON COMMUNICATIONS 2000年第6期48卷 938-947页

作者： Wesel, RD Liu, XT Shi, W Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

This paper describes techniques for the design and analysis of trellis codes that provide reliable communication over every channel in a specified set of possible channels, where each channel is characterized by additive white Gaussian noise with a distinct periodic variation in signal-to-noise ratio. An important practical application for such trellis codes is the periodic erasure channel produced by partial-band interference dispersed by a block interleaver. We present trellis codes that provide reliable communication over all periodic erasure patterns of a given period for which the number of unerased coded bits per period is at least equal to the number of information bits per period.

关键词： fading channels interleaved coding periodic erasures trellis-coded modulation trellis codes

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coding schemes incorporating soft-decision DPSK over HF Rayleigh fading channels

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WIRELESS PERSONAL COMMUNICATIONS 2001年第2期16卷 95-113页

作者： Dimakis, CE Nissopoulos, IK Kouris, SS Aristotelian Univ Salonika Dept Elect Engn & Comp Engn Telecommun Div GR-54006 Salonika Greece

A soft-decision 8-DPSK modulation format is introduced in a concatenated coding scheme and the performance of the resulting system is evaluated over a slow Rayleigh fading HF ionospheric Link in the presence of Additive White Gaussian noise (AWGN). Well-known Ungerboeck TCM techniques are used as inner codes and a Reed-Solomon block code as outer code. The coded/modulated signal is differentially encoded before transmission to combat random phase changes caused by the channel. Soft-decision demodulator's output is used as an input to a modified Viterbi decoder that calculates the Euclidean distances of the received signal from an 8-PSK constellation adapted to the signal's amplitude variations. Block interleaving techniques are necessary to randomise long bursts of errors caused by the fading channel. Simulation results show that significant coding gains are achieved with a minor bandwidth expansion over uncoded, diversity or other coded systems. Finally, the interesting effects of interleaving on the performance of the proposed systems are analysed.

关键词： fading channels Trellis coded modulation concatenated coding differential phase shift keying interleaved coding

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Concatenated coding schemes and interleaving techniques over Rayleigh fading ionospheric channels

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2001年第2期14卷 199-216页

作者： Nissopoulos, IK Dimakis, CE Kouris, SS Aristotelian Univ Salonika Dept Elect Engn & Comp Engn Telecommun Div Salonika 54006 Greece

In this paper the performance of a concatenated coding scheme is evaluated over a slow Rayleigh fading HF ionospheric link with additive white Gaussian noise (AWGN). Well-known Ungerboeck TCM techniques onto an 8-PSK signal set are used as inner codes and Reed-Solomon block codes as outer codes. The coded/modulated signal is further differentially encoded before transmission to combat random phase changes. Block interleaving techniques are necessary to randomise long bursts of errors caused by the fading channel. The performance of the proposed concatenated coding system is investigated for various Doppler spreads. Significant coding gains are achieved over uncoded, diversity or other conventionally coded systems with a small bandwidth expansion. Finally the interesting effects of interleaving on the behaviour of the proposed systems are analysed. Copyright (C) 2001 John Wiley & Sons, Ltd.

关键词： ionospheric channel trellis-coded modulation concatenated codes differential phase shift keying interleaved coding

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Turbo-encoder design for symbol-interleaved parallel concatenated trellis-coded modulation

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IEEE TRANSACTIONS ON COMMUNICATIONS 2001年第3期49卷 425-435页

作者： Fragouli, C Wesel, RD Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

This paper addresses turbo-encoder design for coding with high spectral efficiency using parallel concatenated trellis-coded modulation and symbol interleaving. The turbo-encoder design involves the constituent encoder design and the interleaver design. The constituent encoders are optimized for symbol-wise effective free distance, and each has an infinite symbol-wise impulse response. We identify the canonical structures for the constituent encoder search space. In many cases of practical interest, the optimal structure for these constituent encoders connects the memory elements in a single row. This single row generally applies to turbo-code constituent encoders for parallel concatenation and is not restricted to symbol interleaving. To lower the error floor, a new semi-random interleaver design criteria and a construction method extends the spread-interleaver concept introduced by Divsalar and Pollara. Simulation results show that the proposed system employing symbol interleaving can converge at a lower signal-to-noise ratio than previously reported systems. We report simulation results between 0.5 and 0.6 dB from constrained capacity for rates of 2 and 4 bits/s/Hz.

关键词： concatenated coding convolutional codes interleaved coding trellis-coded modulation turbo codes

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