Journal ArticleDOI
Channel coding with multilevel/phase signals
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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
Wyner-Ziv coding based on TCQ and LDPC codes
TL;DR: The practical performance limit of Slepian-Wolf coded TCQ for quadratic Gaussian Wyner-Ziv coding is established, which mirrors that of entropy-constrained TCQ in classic source coding of Gaussian sources.
Journal ArticleDOI
Trellis-coded quantization designed for noisy channels
Min Wang,Thomas R. Fischer +1 more
TL;DR: The jointly designedTCQ/TCM system outperforms the straightforward cascade of separately designed TCQ and TCM systems and provides larger signal-to-noise ratio than Farvardin and Vaishampayan's (1991) channel-optimized vector quantization.
Proceedings ArticleDOI
Rateless spinal codes
TL;DR: A novel rateless code, the spinal code, which uses a hash function over the message bits to produce pseudo-random bits that in turn can be mapped directly to a dense constellation for transmission.
Book
Video Compression and Communications: From Basics to H.261, H.263, H.264, MPEG4 for DVB and HSDPA-Style Adaptive Turbo-Transceivers
TL;DR: Video Compression and Communications has been updated and condensed yet remains all-encompassing, giving a comprehensive overview of the subject, covering compression issues, coding delay, implementational complexity and bitrate.
Journal ArticleDOI
An improvement to generalized-minimum-distance decoding
D.J. Taipale,Michael B. Pursley +1 more
TL;DR: The performance of generalized minimum distance (GMD) decoding is better if the new criterion is used, and the weights used in GMD decoding are generalized to permit each of the possible M symbol values to have a different weight.
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.
Book
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.