Results 261 to 270 of about 52,986 (291)

Locating the Node by Exploiting Shadowing Fading

2015 IEEE 82nd Vehicular Technology Conference (VTC2015-Fall), 2015
Shadowing fading is generally considered to be detrimental to node localization based on received signal strength (RSS). However, in this paper, we propose a new localization method which exploits shadowing fading to localize the node with unknown position.
Zhenghuan Wang, Fei Gao, Heng Liu, Shengxin Xu, Yaping Ni   +4 more
openaire   +1 more source

Modeling of Fading and Shadowing

2011
Various models to describe the statistical fluctuations in wireless channels are presented. These models range from the simple Rayleigh ones, to cascaded ones, and to complex models such as those based on κ – μ, η – μ, and Nakagami-N-gamma distributions. They are compared in terms of their properties, error rates and outage probabilities.
openaire   +1 more source

Maximal Ratio Combining (MRC) in Shadowed Fading Channels in Presence of Shadowed Fading Cochannel Interference (CCI)

Wireless Personal Communications, 2011
Simultaneous existence of multipath fading and shadowing leads to worsening conditions in wireless channels. This is further compounded by the interference from other base stations operating at the same frequency. The effect of this cochannel interference (CCI) and shadowed fading in error rates is studied when maximal ratio combining is used to ...
openaire   +1 more source

Improving target tracking by incorporating shadowing fading

2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2015
To accurately localize the target, wireless positioning systems use range measurements from different anchors, which are deployed around the monitored region in advance. In most applications where the target such as a human body has a certain volume, the target will shadow the wireless links comprised of the anchors, making the received signal strength
Zhenghuan Wang, Fei Gao, Heng Liu, Shengxin Xu, Yaping Ni, Jie Yang   +5 more
openaire   +1 more source

MGF for gamma‐shadowed ricean fading channel

European Transactions on Telecommunications, 2007
AbstractThe moment‐generating function (MGF) of the received signal‐to‐noise ratio (SNR) is a convenient tool in the performance analysis of modulation schemes in fading channels. In this letter, we derive the MGF for gamma‐shadowed Ricean fading channels under the assumption that the average power of the Ricean fading is characterised by a gamma ...
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Shadow fading correlation between uplink and downlink

IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202), 2002
Selection diversity among base stations can be employed to combat shadow fading in mobile telephony. Selection of the strongest uplink received signal from a mobile at several base stations is straightforward. However, determining the base station from which to transmit to the mobile for downlink diversity often relies on the assumption that shadow ...
E. Perahia, D.C. Cox
openaire   +1 more source

Uplink Capacity with Correlated Lognormal Shadow Fading

VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009
In this paper we study the effect of Base Station (BS) and User Terminal (UT) on the capacity of the Gaussian Cellular Multiple Access Channel. We also build a Monte Carlo simulator using realistic system parameters and distance dependent shadowing correlation estimation models.
Dimitrios Kaltakis, Muhammad A. Imran, Reza Hoshyar   +2 more
openaire   +1 more source

Secure the shadow ere the substance fade

History of Photography, 2004
Abstract If we dip into the Oxford English Dictionary for information on the word ‘shade’, we find that ‘the shades’ was in use as a term for the Underworld by the late sixteenth century and that soon afterwards it was being applied as well to the inhabitants of that region, the ghosts and disembodied spirits of the dead.
B. A. Henisch, H. K. Henisch
openaire   +1 more source

On the utility of gamma PDF in modeling shadow fading (slow fading)

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363), 2003
Shadow fading causes random fluctuations of the envelope mean at the mobile. The lognormal distribution is widely accepted for this phenomenon. In this paper we argue that, based on theoretical results and measured data, gamma distribution does the job as well.
A. Abdi, M. Kaveh
openaire   +1 more source

Second-Order Statistics of $��-��$ Shadowed Fading Channels

2015
In this paper, novel closed-form expressions for the level crossing rate (LCR) and average fade duration (AFD) of $ - $ shadowed fading channels are derived. The new equations provide the capability of modeling the correlation between the time derivative of the shadowed dominant and multipath components of the $ - $ shadowed fading envelope ...
openaire   +1 more source