Narrowband signals are signals that occupy a narrow range of frequencies or that have a small fractional bandwidth.[1] In the audio spectrum, narrowband sounds are sounds that occupy a narrow range of frequencies. In telephony, narrowband is usually considered to cover frequencies 300–3400 Hz, i.e. the voiceband.
In the study of wired channels, narrowband implies that the channel under consideration is sufficiently narrow that its frequency response can be considered flat. The message bandwidth will therefore be less than the coherence bandwidth of the channel. That is, no channel has perfectly flat fading, but the analysis of many aspects of wireless systems is greatly simplified if flat fading can be assumed.
Two-Way Radio Narrowbanding refers to a U.S. Federal Communications Commission (FCC) Order issued in December 2004 requiring all CFR 47 Part 90 VHF (150-174 MHz) and UHF (421-470 MHz) PLMR (Private Land Mobile Radio) licensees operating legacy wideband (25 kHz bandwidth) voice or data/SCADA systems to migrate to narrowband (12.5 kHz bandwidth or equivalent) systems by January 1, 2013.[2]
^Hagen, Jon B. (2009). Radio-Frequency Electronics : Circuits and Applications (2nd ed.). Leiden: Cambridge University Press. ISBN978-0-511-58012-3.
^(PDF). Archived from the original (PDF) on 2013-07-24. Retrieved 2010-08-29.
External linksedit
FCC website
FCC Part 90 LMR VHF/UHF Narrowbanding Information and Licensee Resources
Narrowbanding Resource Guide for 2013
January 01, 1970
narrowband, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, march, 2011, le. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Narrowband news newspapers books scholar JSTOR March 2011 Learn how and when to remove this message Narrowband signals are signals that occupy a narrow range of frequencies or that have a small fractional bandwidth 1 In the audio spectrum narrowband sounds are sounds that occupy a narrow range of frequencies In telephony narrowband is usually considered to cover frequencies 300 3400 Hz i e the voiceband In radio communications a narrowband channel is a channel in which the bandwidth of the message does not significantly exceed the channel s coherence bandwidth In the study of wired channels narrowband implies that the channel under consideration is sufficiently narrow that its frequency response can be considered flat The message bandwidth will therefore be less than the coherence bandwidth of the channel That is no channel has perfectly flat fading but the analysis of many aspects of wireless systems is greatly simplified if flat fading can be assumed Contents 1 Two way radio narrowband 2 See also 3 References 4 External linksTwo way radio narrowband editTwo Way Radio Narrowbanding refers to a U S Federal Communications Commission FCC Order issued in December 2004 requiring all CFR 47 Part 90 VHF 150 174 MHz and UHF 421 470 MHz PLMR Private Land Mobile Radio licensees operating legacy wideband 25 kHz bandwidth voice or data SCADA systems to migrate to narrowband 12 5 kHz bandwidth or equivalent systems by January 1 2013 2 See also editBroadband Electromagnetic interference Land mobile service Rural internet Ultra wideband Wideband Narrowband IoTReferences edit Hagen Jon B 2009 Radio Frequency Electronics Circuits and Applications 2nd ed Leiden Cambridge University Press ISBN 978 0 511 58012 3 FCC Order issued in December of 2004 PDF Archived from the original PDF on 2013 07 24 Retrieved 2010 08 29 External links editFCC website FCC Part 90 LMR VHF UHF Narrowbanding Information and Licensee Resources Narrowbanding Resource Guide for 2013 Retrieved from https en wikipedia org w index php title Narrowband amp oldid 1127678829, wikipedia, wiki, book, books, library,
