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Encyclopedia > Local Multipoint Distribution Service

Local Multipoint Distribution Service is a broadband wireless access technology that uses microwave signals operating between the 26GHz and 29GHz bands. In the United States, frequencies from 31.0 through 31.3 GHz are also considered LMDS frequencies. Three 45 Mbit/s wireless dishes on top of 307 W. 7th Street Fort Worth TX Broadband wireless access is a technology aimed at providing wireless access to data networks, with high data rates. ... This page is about the radiation; for the appliance, see microwave oven. ...


LMDS is a point-to-multipoint service, hence is typically deployed for access by multiple parties. Throughput capacity and distance of the link depends on the modulation method used - either phase-shift keying or amplitude modulation. Links up to 5 miles (8 km) from the base station are possible, but distance is typically limited to 1.5 miles by rain fade because heavy rain can severely attenuate signal levels. Point-to-multipoint (PT2MP) telecommunications is most typically (2003) used in wireless Internet and IP Telephony via gigahertz radio frequencies. ... Modulation is the process of varying a carrier signal, typically a sinusoidal signal, in order to use that signal to convey information. ... Phase-shift keying (PSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave). ... Amplitude modulation (AM) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating signal. ... In satellite communications, rain fade refers to the absorption of a microwave Radio Frequency (RF) signal by rain or snow, and is especially prevalent in frequencies above 11 GHz. ...


Point-to-point systems are also capable of using the LMDS frequencies and can reach slightly farther distances due to increased antenna gain. Point-to-Point telecommunications is most recently (2003) referenced regarding wireless data communications for Internet or Voice over IP via radio frequencies in the multi-gigahertz range. ...


See also

Multichannel multipoint distribution service, also known as MMDS or wireless cable, is a wireless telecommunications technology, used for general-purpose broadband networking or, more commonly, as an alternative method of cable television programming reception. ...

External links

  • LMDS Frequently Asked Questions

  Results from FactBites:
 
Local Multipoint Distribution Service - Wikipedia, the free encyclopedia (176 words)
Local Multipoint Distribution Service is a broadband wireless access technology that uses microwave signals operating between the 26GHz and 29GHz bands.
LMDS is a point-to-multipoint service, hence is typically deployed for access by multiple parties.
Throughput capacity and distance of the link depends on the modulation method used - either phase-shift keying or amplitude modulation.
  More results at FactBites »

 
 

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