Proceedings ArticleDOI
Simplified Kalman estimation of fading mobile radio channels: high performance at LMS computational load
Lars Lindbom
- Vol. 3, pp 352-355
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TLDR
Low-complexity algorithms for channel estimation in Rayleigh fading environments are presented, using a novel averaging approach to replace the online update of the Riccati equation with a constant matrix.Abstract:
Low-complexity algorithms for channel estimation in Rayleigh fading environments are presented. The channel estimators are presumed to operate in conjunction with a Viterbi decoder, or an equalizer. The algorithms are based on simplified internal modeling of time-invariant channel coefficients and approximation of a Kalman estimator. A novel averaging approach is used to replace the online update of the Riccati equation with a constant matrix. The associated Kalman gain is expressed in an analytical form. Compared with RLS (recursive least squares) tracking, both a significantly lower bit error rate and a much lower computational complexity are achieved. >read more
Citations
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Journal ArticleDOI
Tracking of time-varying mobile radio channels .1. The Wiener LMS algorithm
TL;DR: The proposed algorithms are transformed into a Wiener filtering problem, and the parameters are modeled as correlated ARIMA processes with known dynamics, leading to a new framework for systematic and optimal design of simple adaptation laws based on prior information.
Journal ArticleDOI
Tracking of time-varying mobile radio channels. II. A case study
TL;DR: Low-complexity Wiener LMS (WLMS) adaptation algorithms, of use for channel estimation, are evaluated on the fast fading radio channels encountered in IS-136 TDMA systems, with the aim of clarifying several issues.
Journal ArticleDOI
Channel estimation in narrowband wireless communication systems
TL;DR: This tutorial paper reviews commonly used approaches to channel estimation, both time-invariant and time-varying channels, and considers both pilot symbol interpolation and data-directed channel tracking.
Patent
Synchronization of nodes
TL;DR: In this paper, a method and apparatus for adjusting an oscillator in a network for frequency drift was proposed, where nodes in the network exchange time stamp messages, which contain the time the time stamp message is transmitted, the nodes measurement of an interval and an uncertainty value for the nodes estimation of the interval.
Journal ArticleDOI
Adaptive MLSE performance on the D-AMPS 1900 channel
TL;DR: It is shown that the receiver specification points for D-AMPS 1900 are met and that performance can be further enhanced with fractionally spaced equalization and/or receiver-antenna diversity combining.
References
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BookDOI
Adaptive Algorithms and Stochastic Approximations
TL;DR: The juxtaposition of these two expressions in the title reflects the ambition of the authors to produce a reference work, both for engineers who use adaptive algorithms and for probabilists or statisticians who would like to study stochastic approximations in terms of problems arising from real applications.
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Design of adaptive algorithms for the tracking of time‐varying systems
TL;DR: Multistep algorithms, introduced in the Soviet literature, are generalized and systematically studied; they are shown to provide significant improvements over the classical (one-step) methods for the purpose of tracking.
Journal ArticleDOI
Design of adaptive algorithms for the tracking of time varying systems
TL;DR: Multistep algorithms, introduced in the Soviet literature, are generalized and systematically studied and shown to provide significant improvements over the classical (one-step) methods for the purpose of tracking.