Multipath interference


Multipath interference

Multipath interference is a phenomenon in the physics of waves whereby a wave from a source travels to a detector via two or more paths and, under the right condition, the two (or more) components of the wave interfere. Multipath interference is a common cause of "ghosting" in analog television broadcasts.

Conditions

The condition necessary is that the components of the wave remain coherent throughout the whole extent of their travel.

Coherent waves that travel along two different paths will arrive with phase shift, hence interfering with each other.

The interference will arise owing to the two (or more) components of the wave having, in general, travelled a different length (as measured by optical path length – geometric length and diffraction (differing optical speed)), and thus arriving at the detector out of phase with each other.

The signal due to indirect paths interfere with the required signal in amplitude as well as phase which is called multipath fading.

See also


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Multipath — may refer to: Multipath propagation in electromagnetic wave propagation Multipath I/O in operating system input/output subsystems Multipath routing in packet switching networks Multipath interference in wave transmission This disambiguation page… …   Wikipedia

  • Interference (wave propagation) — Two point interference in a ripple tank. In physics, interference is the phenomenon in which two waves superpose each other to form a resultant wave of greater or lower amplitude. Interference usually refers to the interaction of waves that are… …   Wikipedia

  • Multipath propagation — This article is about the electromagnetic propagation phenomenon. For the computing storage term, see Multipath I/O. For the routing term, see Multipath Routing. In wireless telecommunications, multipath is the propagation phenomenon that results …   Wikipedia

  • Co-channel interference — or CCI is crosstalk from two different radio transmitters using the same frequency. There can be several causes of co channel radio interference; four examples are listed here. Cellular Mobile Networks: In cellular mobile communication (GSM LTE… …   Wikipedia

  • Intersymbol interference — In telecommunication, intersymbol interference (ISI) is a form of distortion of a signal in which one symbol interferes with subsequent symbols. This is an unwanted phenomenon as the previous symbols have similar effect as noise, thus making the… …   Wikipedia

  • Orthogonal frequency-division multiplexing — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • Code division multiple access — This article is about a channel access method. For the mobile phone technology referred to as CDMA, see IS 95 and CDMA2000. Multiplex techniques Circuit mode (constant bandwidth) TDM · FDM  …   Wikipedia

  • Distributed transmission system — This article is about terrestrial broadcasting. For electrical power distribution, see distributed generation. In North American digital terrestrial television broadcasting, a distributed transmission system (DTS or DTx) is a form of single… …   Wikipedia

  • Digital television transition in the United States — Further information: Digital television transition The DTV (an abbreviation of digital television, also called digital broadcast) transition in the United States was the switchover from analog (the traditional method of transmitting television… …   Wikipedia

  • TV and FM DX — TV DX and FM DX is the active search for distant radio or television stations received during unusual atmospheric conditions. The term DX is an old telegraphic term meaning long distance. VHF/UHF television and radio signals are normally limited… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.