Journal ArticleDOI
MLSE for an unknown channel .I. Optimality considerations
Keith M. Chugg,Andreas Polydoros +1 more
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TLDR
It is shown that a fractionally-spaced whitened matched filter, matched to the known data pulse, provides a set of sufficient statistics when a tapped delay line channel model is assumed, and that the problem is ill-posed when the channel impulse response is generalized to a CT, finite-length model.Abstract:
The problem of performing joint maximum-likelihood (ML) estimation of a digital sequence and unknown dispersive channel impulse response is considered starting from a continuous-time (CT) model. Previous investigations of this problem have not considered the front-end (FE) processing in detail; rather, a discrete-time signal model has been assumed. We show that a fractionally-spaced whitened matched filter, matched to the known data pulse, provides a set of sufficient statistics when a tapped delay line channel model is assumed, and that the problem is ill-posed when the channel impulse response is generalized to a CT, finite-length model. Practical approximations are considered that circumvent this ill-posed condition. Recursive computation of the joint-ML metric is developed. Together, the FE processing and metric recursion provide a receiver structure which may be interpreted as the theoretical foundation for the previously introduced technique of per-survivor processing, and they lead directly to generalizations. Several FE processors representative of those suggested in the literature are developed and related to the practically optimal FE.read more
Citations
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Journal ArticleDOI
Maximum likelihood sequence detection using a pilot tone
TL;DR: This paper derives, analyzes, and simulates a maximum likelihood (ML) sequence detector (MLSD) for a linearly modulated signal transmitted with a pilot tone (PT-MLSD), and many of the disadvantages of other pilot tone systems are avoided.
Book ChapterDOI
Per-Survivor Processing (PSP)
Andreas Polydoros,Keith M. Chugg +1 more
TL;DR: It is argued that PSP not only offers superior and robust performance versus the classical segregated-task architectures in many challenging environments, but that it is also the natural way of approaching the decoding problem from first principles, thus making it the appropriate vehicle for integrated-task receiver design.
Journal Article
The Design of an SCFNN Based Nonlinear Channel Equalizer
TL;DR: It is demonstrated that the SCFNN-based digital channel equalizer possesses the ability to recover the channel distortion effectively and can be close to that of the Bayesian optimal solution and ANFIS.
Journal ArticleDOI
Adaptive soft‐decision algorithms for mobile fading channels
TL;DR: Simulation results show a significant improvement of the suggested adaptive soft-dec decision algorithms over the standard configuration, which consists of a hard-decision channel equalizer followed by a convolutional decoder.
References
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Book
Adaptive Filter Theory
TL;DR: In this paper, the authors propose a recursive least square adaptive filter (RLF) based on the Kalman filter, which is used as the unifying base for RLS Filters.
Book
Optimization by Vector Space Methods
TL;DR: This book shows engineers how to use optimization theory to solve complex problems with a minimum of mathematics and unifies the large field of optimization with a few geometric principles.
Journal ArticleDOI
Maximum-likelihood sequence estimation of digital sequences in the presence of intersymbol interference
TL;DR: In this paper, a maximum likelihood sequence estimator for a digital pulse-amplitude-modulated sequence in the presence of finite intersymbol interference and white Gaussian noise is developed, which comprises a sampled linear filter, called a whitened matched filter, and a recursive nonlinear processor, called the Viterbi algorithm.
Journal ArticleDOI
Characterization of Randomly Time-Variant Linear Channels
TL;DR: Several new canonical channel models are derived in this paper, some of which are dual to those of Kailath, and a model called the Quasi-WSSUS channel is presented to model the behavior of such channels.
Journal ArticleDOI
Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems
TL;DR: A uniform receiver structure for linear carrier-modulated data-transmission systems is derived which for decision making uses a modified version of the Viterbi algorithm, which operates directly on the output signal of a complex matched filter and requires no squaring operations.