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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Patent
Digital broadcast transmitting/receiving system having an improved receiving performance and signal processing method thereof
Hae-Joo Jeong,Yong-Deok Chang +1 more
TL;DR: In this paper, a digital broadcast transmitting/receiving system and a signal processing method thereof that can improve the receiving performance of the system was proposed. But the received performance was not analyzed in a multi-path channel.
Patent
Digital signal transmission system based on partitioning of a coded modulation with concatenated codings
Antoine Chouly,Americo Brajal +1 more
TL;DR: In this article, a multistage channel encoder (12) carries out concatenation of internal and external codes to blocks and divides the coding over various partitioning levels of the constellation.
Journal ArticleDOI
Optimal decoding of coded PSK and QAM signals in correlated fast fading channels and AWGN: a combined envelope, multiple differential and coherent detection approach
TL;DR: The maximum likelihood sequence estimator for the reception of coded digital phase modulated signals with single or multiamplitude constellations, transmitted over a multiplicative, frequency-nonselective Rayleigh or Rician channel and corrupted by additive white Gaussian noise is derived.
Journal ArticleDOI
Trellis-coded vector quantization
TL;DR: Trellis-coded quantization is generalized to allow a vector reproduction alphabet and it is shown that for a stationary ergodic vector source, the quantization noise is zero-mean and of a variance equal to the difference between the source variance and the variance of the reproduction sequence.
Journal ArticleDOI
Entropy-constrained trellis-coded quantization
Thomas R. Fischer,M. Wang +1 more
TL;DR: An entropy-constrained trellis-coded quantization (ECTCQ) design algorithm is presented, based on the generalized Lloyd algorithm for trellIS code design and the entropy- Constrained vector quantization design algorithm.
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.