Frequency Hopped - Spread Spectrum system
Italian translation: salto di frequenza - sistema di distribuzione dello spettro
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| 11:10 Mar 19, 2007 |
| English to Italian translations [PRO] Tech/Engineering - Electronics / Elect Eng | |||||||
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|  Selected response from: Valeria Faber Italy Local time: 16:07 | ||||||
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| 4 +1 | salto di frequenza - sistema di spettro sparso |
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Answers
3 mins confidence: 
peer agreement (net): +1
peer agreement (net): +1| frequency hopped - spread spectrum system salto di frequenza - sistema di spettro sparso Explanation: . -------------------------------------------------- Note added at 5 min (2007-03-19 11:15:26 GMT) -------------------------------------------------- nei sistemi wireless ci sono due tipi di sistemi: a salto di frequenza (Frequence hopping) o a spargimento dello spettro (SSS) -------------------------------------------------- Note added at 6 min (2007-03-19 11:17:03 GMT) -------------------------------------------------- se preferisci puoi dire **sistema a spettro distribuito** -------------------------------------------------- Note added at 6 min (2007-03-19 11:17:17 GMT) -------------------------------------------------- "Spread-spectrum radio communications, long a favorite technology of the military because it resists jamming and is hard for an enemy to intercept, is now on the verge of potentially explosive commercial development. The reason: spread-spectrum signals, which are distributed over a wide range of frequencies and then collected onto their original frequency at the receiver, are so inconspicuous as to be 'transparent.' Just as they are unlikely to be intercepted by a military opponent, so are they unlikely to interfere with other signals intended for business and consumer users -- even ones transmitted on the same frequencies. Such an advantage opens up crowded frequency spectra to vastly expanded use. -------------------------------------------------- Note added at 7 min (2007-03-19 11:17:58 GMT) -------------------------------------------------- Spread Spectrum uses wide band, noise-like signals. Because Spread Spectrum signals are noise-like, they are hard to detect. Spread Spectrum signals are also hard to Intercept or demodulate. Further, Spread Spectrum signals are harder to jam (interfere with) than narrowband signals. -------------------------------------------------- Note added at 8 min (2007-03-19 11:19:03 GMT) -------------------------------------------------- Frequency hopping systems -- The wideband frequency spectrum desired is generated in a different manner in a frequency hopping system. It does just what its name implies. That is, it "hops" from frequency to frequency over a wide band. The specific order in which frequencies are occupied is a function of a code sequence, and the rate of hopping from one frequency to another is a function of the information rate. -------------------------------------------------- Note added at 9 min (2007-03-19 11:20:14 GMT) -------------------------------------------------- http://it.wikipedia.org/wiki/Frequency-hopping_spread_spectr... -------------------------------------------------- Note added at 10 min (2007-03-19 11:20:58 GMT) -------------------------------------------------- http://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum -------------------------------------------------- Note added at 17 min (2007-03-19 11:28:07 GMT) -------------------------------------------------- naturalmente esistono altri tipi di sistemi (ibridi, con registri o codici), ma oramai si parla prevalentemente di questi. In questo link trovi ulteriori informazioni sul funzionamento: http://cbdd.wsu.edu/kewlcontent/cdoutput/TR502/page74.htm -------------------------------------------------- Note added at 50 min (2007-03-19 12:01:03 GMT) -------------------------------------------------- www.sss-mag.com/ss.html - 29k cas.et.tudelft.nl/~glas/ssc/techn/techniques.html searchnetworking.techtarget.com/sDefinition/0,,sid7_gci525695,00.html |
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