formulasearchengine - User contributions [en]

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2015-01-12T21:28:31Z

128.8.86.208: /* History */

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2014-12-16T22:59:58Z

128.8.78.84: Grammatical error

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2014-11-14T20:12:56Z

128.8.140.87:

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2014-07-14T13:22:45Z

128.8.86.156: /* Applications */

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2013-04-08T21:18:31Z

128.8.86.19:

{{About|the electromagnetic propagation phenomenon|the computing storage term|Multipath I/O|the routing term|Multipath Routing}}
{{nofootnotes|date=November 2009}}
In [[wireless]] [[telecommunication]]s, '''multipath''' is the [[radio propagation|propagation]] phenomenon that results in [[radio]] [[signalling (telecommunications)|signals]] reaching the receiving [[antenna (electronics)|antenna]] by two or more paths. Causes of multipath include [[atmospheric ducting]], [[ionospheric reflection]] and [[refraction]], and [[reflection (physics)|reflection]] from water bodies and terrestrial objects such as mountains and buildings.

The effects of multipath include constructive and destructive [[Interference (wave propagation)|interference]], and [[phase (waves)|phase shifting]] of the signal. Destructive interference causes fading. Where the magnitudes of the signals arriving by the various paths have a distribution known as the [[Rayleigh distribution]], this is known as [[Rayleigh fading]]. Where one component (often, but not necessarily, a [[line of sight (telecommunications)|line of sight]] component) dominates, a [[Rice distribution|Rician distribution]] provides a more accurate model, and this is known as [[Rician fading]].

==Examples of multipath propagation==

In [[fax|facsimile]] and [[television]] [[transmission (telecommunications)|transmission]], multipath causes [[jitter]] and [[ghosting (television)|ghosting]], seen as a faded duplicate image to the right of the main image. Ghosts occur when transmissions bounce off a mountain or other large object, while also arriving at the antenna by a shorter, direct route, with the receiver picking up two signals separated by a delay.

[[File:Multipath propagation diagram en.svg|thumb|Radar multipath echoes from an actual target cause ghosts to appear.]]

In [[radar]] processing, multipath causes ghost targets to appear, deceiving the radar [[receiver (radio)|receiver]]. These ghosts are particularly bothersome since they move and behave like the normal targets (which they echo), and so the receiver has difficulty in isolating the correct target echo. These problems can be overcome by incorporating a ground map of the radar's surroundings and eliminating all echoes which appear to originate below ground or above a certain height.

In digital radio communications (such as [[GSM]]) multipath can cause errors and affect the quality of communications. The errors are due to [[intersymbol interference]] (ISI). [[Equalization filter|Equalisers]] are often used to correct the ISI. Alternatively, techniques such as [[orthogonal frequency division modulation]] and [[rake receiver]]s may be used.

In a Global Positioning System receiver, Multipath Effect can cause a stationary receiver's output to indicate as if it were randomly jumping about or creeping. When the unit is moving the jumping or creeping is hidden, but it still degrades the displayed accuracy.

==Multipath propagation in wired media==
Multipath propagation may also happen in wired media, especially where [[Impedance matching|impedance mismatch]] causes [[signal reflection]]. A well-known example is [[power line communication]].

High-speed power line communication systems usually employ multi-carrier modulations (such as [[OFDM]] or [[Wavelet]] OFDM) to avoid the [[intersymbol interference]] that multipath propagation would cause.

The [[ITU-T]] [[G.hn]] standard provides a way to create a high-speed (up to 1 Gigabit/s) [[local area network]] using existing home wiring ([[power line communication|power lines]], phone lines and [[ethernet over coax|coaxial cables]]). G.hn uses OFDM with a [[cyclic prefix]] to avoid ISI. Because multipath propagation behaves differently in each kind of wire, G.hn uses different OFDM parameters (OFDM symbol duration, Guard Interval duration) for each media.

==Mathematical modeling==
[[File:Multipath impulse response.png|thumb|right|320px|Mathematical model of the multipath impulse response.]]
The mathematical model of the multipath can be presented using the method of the [[impulse response]] used for studying [[linear system]]s.

Suppose you want to transmit a single, ideal [[Dirac delta function|Dirac pulse]] of [[electromagnetism|electromagnetic]] power at time 0, i.e.

:<math>x(t)=\delta(t)</math>

At the receiver, due to the presence of the multiple electromagnetic paths, more than one pulse will be received (we suppose here that the [[channel (communications)|channel]] has infinite [[Bandwidth (signal processing)|bandwidth]], thus the pulse shape is not modified at all), and each one of them will arrive at different times. In fact, since the electromagnetic signals travel at the [[speed of light]], and since every path has a geometrical length possibly different from that of the other ones, there are different air travelling times (consider that, in [[free space]], the light takes 3 μs to cross a 1 km span). Thus, the received signal will be expressed by

:<math>y(t)=h(t)=\sum_{n=0}^{N-1}{\rho_n e^{j\phi_n} \delta(t-\tau_n)}</math>

where <math>N</math> is the number of received impulses (equivalent to the number of electromagnetic paths, and possibly very large), <math>\tau_n</math> is the time delay of the generic <math>n^{th}</math> impulse, and <math>\rho_n e^{j\phi_n}</math> represent the complex amplitude (i.e., magnitude and phase) of the generic received pulse. As a consequence, <math>y(t)</math> also represents the impulse response function <math>h(t)</math> of the equivalent multipath model.

More in general, in presence of time variation of the geometrical reflection conditions, this impulse response is time varying, and as such we have

:<math>\tau_n=\tau_n(t)</math>

:<math>\rho_n=\rho_n(t)</math>

:<math>\phi_n=\phi_n(t)</math>

Very often, just one parameter is used to denote the severity of multipath conditions: it is called the '''[[multipath time]]''', <math>T_M</math>, and it is defined as the time delay existing between the first and the last received impulses

:<math>T_M=\tau_{N-1}-\tau_0</math>

[[File:Multipath transfer function.png|thumb|right|320px|Mathematical model of the multipath channel transfer function.]]
In practical conditions and measurement, the multipath time is computed by considering as last impulse the first one which allows to receive a determined amount of the total transmitted power (scaled by the atmospheric and propagation losses), e.g. 99%.

Keeping our aim at linear, time invariant systems, we can also characterize the multipath phenomenon by the channel transfer function <math>H(f)</math>, which is defined as the continuous time [[Fourier transform]] of the impulse response <math>h(t)</math>

:<math>H(f)=\mathfrak{F}(h(t))=\int_{-\infty}^{+\infty}{h(t)e^{-j 2\pi f t} d t}=\sum_{n=0}^{N-1}{\rho_n e^{j\phi_n} e^{-j2 \pi f \tau_n}}</math>

where the last right-hand term of the previous equation is easily obtained by remembering that the Fourier transform of a Dirac pulse is a complex exponential function, an [[eigenfunction]] of every linear system.

The obtained channel transfer characteristic has a typical appearance of a sequence of peaks and valleys (also called ''notches''); it can be shown that, on average, the distance (in Hz) between two consecutive valleys (or two consecutive peaks), is roughly inversely proportional to the multipath time. The so-called '''coherence bandwidth''' is thus defined as

:<math>B_C \approx \frac{1}{T_M}</math>

For example, with a multipath time of 3 μs (corresponding to a 1 km of added on-air travel for the last received impulse), there is a coherence bandwidth of about 330 kHz.

== See also ==
* [[Choke ring antenna]], a design that can reject extraneous multipath signals
* [[Diversity scheme]]s
* [[Fading]]
* [[Multipath interference]]
* [[Olivia MFSK]]
* [[Orthogonal frequency-division multiplexing]]
* [[Signal flow]]
* [[Ultra wide-band]]
* [[Doppler spread]]
* [[Lloyd's mirror]]

==References==
* [[MIL-STD-188]]
* [[Federal Standard 1037C]]

{{FS1037C}}

{{Audio broadcasting}}
{{Telecommunications}}

[[Category:Broadcast engineering]]
[[Category:Radio frequency propagation]]

[[ar:شعث الصرط]]
[[de:Mehrwegempfang]]
[[es:Propagación Multicamino]]
[[fr:Multipath]]
[[ko:다중경로]]
[[it:Multipath fading]]
[[nl:Meerwegontvangst]]
[[ja:マルチパス]]
[[sv:Flervägsfel]]
[[zh:多径]]

Rainbow table

2012-08-30T14:22:45Z

128.8.130.16:

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Numerical smoothing and differentiation

2012-07-20T19:33:52Z

128.8.142.21: /* Convolution coefficients */

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2012-03-11T19:22:04Z

128.8.86.162: /* Geometrical interpretation */

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