multipath

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multipath

[′məl·tə‚path]
(electromagnetism)

multipath

(1) See multipath routing.

(2) A radio signal that winds up taking two or more paths because the signal is reflected off buildings or other obstructions. Although multipath is a problem with all kinds of radio transmission, ghosts on a TV channel are an example of multipath that you can see with your own eyes. See antenna diversity.
References in periodicals archive ?
In detecting low altitude targets, the presence of reflections from sea or ground surface can cause multipath propagation. In some literatures, the implicit assumption is that only one reflection path exists [12].
However, also terrestrial signals experience multipath propagation. Multipath propagation biases range estimates if standard correlator based methods are used.
Reference [26] proposes the following distributions for different fading types: Gaussian distribution with mean equal to the RSS mean for flat fading; Log-normal distribution for slow fading due to shadowing effects; Rayleigh or Ricean distribution for fast fading due to multipath propagation.
The experiment - long-term GNSS measurements to monitor changes in multipath propagation errors GNSS signal - was implemented at the field laboratory of the Research Institute of Geodesy, Topography and Cartography, v.v.i.
The coherence will be low when there are more number of multipath propagation in the medium.
For CS based channel estimation methods, an important assumption of sparse multipath channel, where a multipath propagation channel can be separated into a few strong paths and many uncountable weak paths whose transmission energy is approximate to zero, should stand in practical application.
To make the system robust to multipath propagation, a cyclic prefix is added.
In SS communications, the ZCZ property can make spreading codes more robust to the effects of multipath propagation. In fact, a delay spread Tmax within the ZCZ interval may be tolerated, assuming that each ith user's signal, affected by a relative path delay Ti, satisfies the condition:
The fast fading is due to multipath propagation of radio wave.
Small scale fading is caused by multipath propagation and Doppler spread.
Other topics include chaos in optical communications, channel equalization for chaotic communications systems, using coupled maps to improve synchronization performance, blind source separation in the context of deterministic signals, isochronal synchronization and digital chaos-based communication, and the robustness of chaos to multipath propagation media.
For studying multipath propagation in this channel, we consider ray theory model [16] as a mathematical model.