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
Single Carrier Frequency Domain Equalization with Time Domain Noise Prediction for Wideband Wireless Communications
Yu Zhu,Khaled Ben Letaief +1 more
TL;DR: A novel structure, FDE-NP, which consists of a linear frequency domain equalizer (FDE) and a time domain noise predictor (NP) and it is shown that the proposed scheme has lower complexity and achieves better performance and complexity trade-off than the conventional FDE designs.
Journal ArticleDOI
Matched information rate codes for Partial response channels
TL;DR: This paper designs capacity-approaching codes for partial response channels as concatenations of inner trellis codes and outer low-density parity- check (LDPC) codes, and names it a matched information rate (MIR) design.
Proceedings ArticleDOI
Analysis and design of interleaver mappings for iteratively decoded BICM
Jun Tan,Gordon L. Stuber +1 more
TL;DR: The design rules on the symbol mapper are derived and a new symbol mapping design, called the maximum squared Euclidean weight (MSEW) symbol mappers, is presented for both 8-PSK and 16-QAM.
Journal ArticleDOI
Structure, optimization, and realization of FFSK trellis codes
TL;DR: The structure of combinations of (l,k) binary trellis encoders and fast frequency-shift keying (FFSK) modulation is studied and it is concluded that, regardless of the particular realization, the best combinations can always be obtained by using a so-called matched convolutional code.
Proceedings ArticleDOI
Field tests of adaptive modulation and coding for underwater acoustic OFDM
TL;DR: The effective signal-to-noise ratio (SNR) computed after channel estimation and channel decoding is proposed as a new performance metric for mode switching, which is shown to predict the system performance more consistently than the input SNR and the pilot SNR.
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.