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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Coding and multiple-access over fading channels
TL;DR: These Ecole polytechnique federale de Lausanne EPFL students developed a novel and scalable system of communication based on the principles of reinforcement learning and social reinforcement learning.
Patent
Enhanced turbo product codes
TL;DR: In this article, a hyper-encoder module is proposed to decode a block of data having a plurality of sub-blocks, and each sub-block includes a number of systematic block code codewords.
Journal ArticleDOI
Multilevel turbo coding with short interleavers
TL;DR: The impact of the interleaver, embedded in the encoder for a parallel concatenated code, called the turbo code, is studied and it is shown that an increased minimum Hamming distance can be obtained by using a structured interleavers.
Journal ArticleDOI
Multidimensional Signal Constellations for Voiceband Data Transmission
Allen Gersho,Victor B. Lawrence +1 more
TL;DR: The purpose of this paper is to describe the basic theory and implementation for a particular 2 bits/dimension four-dimensional (two-symbol interval) encoding which readily lends itself to simple encoding and decoding.
Journal ArticleDOI
Performance of nonuniform constellations on the Gaussian channel
TL;DR: This paper demonstrates theoretically that for channel SNRs of practical interest, there is actually a small gain in immunity to Gaussian noise, and an appropriate coded modulation scheme can produce gains of about 0.25 dB.
References
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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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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.