Results 121 to 130 of about 2,369 (180)

Characterization of multipath fading channels: channels with specular components

IEEE Transactions on Wireless Communications, 2005
A set of parameters collectively called recentered normalized mean square correlation (RC-NMSR) are introduced to characterize the quality of multipath fading channels with nonzero specular components. The consideration of nonzero specular components requires nontrivial generalization of the parameters previously introduced for wide-sense stationary ...
Do-Sik Yoo, Wayne E. Stark
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Fuzzy channel estimation in multipath fading CDMA channel

11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525), 2002
We study a multipath fading CDMA channel and introduce a fuzzy tracking method to estimate the complex channel coefficients in the downlink. The receiver is the conventional RAKE. The results given by the traditional alpha tracker, differential demodulation and known coefficients are compared to each other.
Antti Niemi, Jyrki Joutsensalo, Tapani Ristaniemi   +2 more
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MLSE equalization and decoding for multipath-fading channels

IEEE Transactions on Communications, 1991
A combined MLSE (maximum likelihood sequence estimation) equalizer and decoder with D-diversity reception is analyzed for slowly time-varying frequency-selective Rayleigh fading channels. An upper bound on the (decoded) bit error probability is derived. This bound is tight for high signal-to-noise ratios or when diversity reception is employed.
Wern-Ho Sheen, Gordon L. Stüber
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GQR models for multipath Rayleigh fading channels

IEEE Journal on Selected Areas in Communications, 2001
In this paper, reduced complexity statistical models for the representation of wide sense stationary-uncorrelated scattering doubly selective fading channels are developed. Their derivation is based on the evaluation of Fourier integrals by means of Gaussian quadrature rules.
CHIAVACCINI, Eugenio, VITETTA, Giorgio Matteo   +1 more
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Multistage multiuser detector for multipath fading channel

European Transactions on Telecommunications, 2001
AbstractIn this paper, the multistage multiuser detector for communication over multipath fading channel is considered. The detector consists of a matched filters bank and a linear equalizer whose outputs are diversity combined to produce initial data estimates.
Dejan M. Novakovic, Miroslav L. Dukic
openaire   +1 more source

Analysis of a CDMA downlink in multipath fading channels

2002 IEEE Wireless Communications and Networking Conference Record. WCNC 2002 (Cat. No.02TH8609), 2003
This paper deals with the performance analysis of a CDMA downlink in multipath fading channels. An approximate expression for the demodulated signal-to-noise ratio is developed for a conventional RAKE receiver. The expression includes an orthogonality factor that quantifies the performance gain of using orthogonal spreading codes in the presence of a ...
Wang Hai, Niclas Wiberg
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The relationship between fading and bandwidth for multipath channels

IEEE Transactions on Wireless Communications, 2005
A signal transmitted over a multipath channel experiences fading, the variability of which is a function of: 1) signal bandwidth; and 2) power delay profiles of the channel's specular and diffuse components. We analyze this general relationship and, for several important classes of multipath channel, we derive simple, closed-form approximations for ...
Martin V. Clark, Larry J. Greenstein
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Frequency estimation in slowly fading multipath channels

IEEE Transactions on Communications, 2002
This paper concerns the estimation of a frequency offset of a known (pilot) signal propagated through a slowly fading multipath channel, such that channel parameters are considered to he constant over the observation interval. We derive a maximum-likelihood (ML) frequency estimation algorithm for additive Gaussian noise and path amplitudes having ...
Vladimir M. Baronkin, Yuriy V. Zakharov, Tim C. Tozer   +2 more
openaire   +2 more sources

Statistical properties of the capacity of multipath fading channels

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications, 2009
It is well known that a frequency-nonselective multipath fading channel can be modeled by a sum of complex sinusoids, also called sum-of-cisoids (SOC). By using the SOC, we can efficiently model the scattered component of the received signal in non-isotropic scattering environments.
Gulzaib Rafiq, Matthias Pätzold 0001
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PSP array processing for multipath fading channels

IEEE Transactions on Communications, 1999
The performance of per-survivor processing (PSP) algorithms with stochastic gradient estimators is investigated for frequency-selective channels and array measurements. The focus is on the degree to which the underlying channel structure can be reliably exploited by such algorithms in tracking the time-varying channel and detecting the data.
Gent Paparisto, Keith M. Chugg
openaire   +1 more source