Journal ArticleDOI
Channel coding with multilevel/phase signals
TLDR
A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance.Abstract:
A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth. This is achieved by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance. Soft maximum--likelihood (ML) decoding using the Viterbi algorithm is assumed. Following a discussion of channel capacity, simple hand-designed trellis codes are presented for 8 phase-shift keying (PSK) and 16 quadrature amplitude-shift keying (QASK) modulation. These simple codes achieve coding gains in the order of 3-4 dB. It is then shown that the codes can be interpreted as binary convolutional codes with a mapping of coded bits into channel signals, which we call "mapping by set partitioning." Based on a new distance measure between binary code sequences which efficiently lower-bounds the Euclidean distance between the corresponding channel signal sequences, a search procedure for more powerful codes is developed. Codes with coding gains up to 6 dB are obtained for a variety of multilevel/phase modulation schemes. Simulation results are presented and an example of carrier-phase tracking is discussed.read more
Citations
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Journal ArticleDOI
Bit-interleaved turbo equalization over static frequency-selective channels: constellation mapping impact
A. Dejonghe,Luc Vandendorpe +1 more
TL;DR: The asymptotic performance is first pointed out, emphasizing the fundamental role played by the constellation mapping, and this specific feature is then further analyzed using the extrinsic information-transfer chart technique, leading to an efficient optimization tool, showing that bit-interleaved TE can outperform its symbol- interleaved counterpart.
Patent
Digital signal decoder using concatenated codes
Khaled Fazel,Antoine Chouly +1 more
TL;DR: In this article, a decoding apparatus for decoding digital signals, such as digital television signals, which have been transmitted by concatenated coded modulation using partitioning levels of a constellation of points representing different code values is described.
Journal ArticleDOI
Joint optimization of TCQ-TCM systems
H.A. Aksu,Masoud Salehi +1 more
TL;DR: This work investigates the performance of joint TCQ/TCM systems and develops various system optimization techniques, considers channel optimized TCQ levels and asymmetric TCM symbol sets, and proposes a simulated annealing based algorithm for joint optimization of TCQ Levels and TCM symbols.
Proceedings ArticleDOI
8-PSK trellis codes on Rayleigh channel
TL;DR: The author proposes a suboptimal coded system that combines a regular convolutional code, bit interleaving, and an appropriate decoding technique, and the bounds on the error performance indicate that the best convolutionian code in conjunction with 8-PSK modulation and appropriate soft-decision metric is an attractive means of improving the reliability.
Proceedings ArticleDOI
A Novel Multilevel Coded Modulation Scheme for Fiber Optical Channel with Nonlinear Phase Noise
TL;DR: A multilevel coded modulation (MLCM) system in the presence of nonlinear phase noise for fiber optical communication is introduced and provides up to 2 dB gain over a forward error correcting scheme for a block error rates around 10-9 with the same overhead and complexity.
References
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Book
Information Theory and Reliable Communication
TL;DR: This chapter discusses Coding for Discrete Sources, Techniques for Coding and Decoding, and Source Coding with a Fidelity Criterion.
Journal ArticleDOI
The viterbi algorithm
TL;DR: This paper gives a tutorial exposition of the Viterbi algorithm and of how it is implemented and analyzed, and increasing use of the algorithm in a widening variety of areas is foreseen.
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Principles of Communication Engineering
I. M. Jacobs,J. M. Wozencraft +1 more
TL;DR: Textbook on communication engineering emphasizing random processes, information and detection theory, statistical communication theory, applications, etc.
Journal ArticleDOI
Convolutional codes I: Algebraic structure
TL;DR: Minimal encoders are shown to be immune to catastrophic error propagation and, in fact, to lead in a certain sense to the shortest decoded error sequences possible per error event.
Journal ArticleDOI
Coherent and Noncoherent Detection CPFSK
W. Osborne,M. Luntz +1 more
TL;DR: This work provides a complete analysis of the performance of CPFSK at high SNR as well as low SNR and thereby unifies and extends the results previously available.