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
Prolog to - High-performance compression of visual information-a tutorial review- part I: still pictures
TL;DR: In this two-part paper, the major building blocks of image coding schemes are overviewed and coding results are presented which compare state-of-the-art techniques for lossy and lossless compression.
Journal ArticleDOI
Joint design of fixed-rate source codes and multiresolution channel codes
Andrea Goldsmith,Michelle Effros +1 more
TL;DR: The fixed transmission rate constraint is relaxing by jointly optimizing the transmission rate, source code, and channel code and it is found that all three code designs have roughly the same performance when their bit allocations are optimized.
Journal ArticleDOI
Turbo-coded APSK modulations design for satellite broadband communications
TL;DR: The proposed coded modulation scheme is shown to provide a considerable performance advantage compared to current standards for satellite multimedia and broadcasting systems.
Journal ArticleDOI
PSK and DPSK trellis codes for fast fading, shadowed mobile satellite communication channels
TL;DR: The performance of 8-PSK and 8-DPSK trellis codes is presented for a class of fast fading, land mobile satellite communication channels and optimality is found to be dependent on the presence of lognormal shadowing.
Dissertation
Rekursive Codes mit der Plotkin-Konstruktion und ihre Decodierung
TL;DR: In dieser Arbeit werden Codes betrachtet, die allein durch rekursive Anwendung der |u|u+v|-Konstruktion, auch als PLOTKIN-kon Struktion bezeichnet, generiert werde.
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.