mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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2.6. naxazi<strong>da</strong>n Cans, rom miRebul rTul signals,<br />
martiv sawyis signalTan Se<strong>da</strong>rebiT aqvs xmaurise-<br />
bri saxe sixSiris F intervalSi. gasagebia, rom<br />
rac ufro `gaWimulia~ F rTuli signalis zoli<br />
mudmivi E energiis dros, miT ufro naklebia signalis<br />
energiis speqtraluri simkvrive.<br />
signalebi didi baziT xasiaTdebian mTeli rigi<br />
upiratesobebiT. aseTebia:<br />
kavSiris <strong>sistemebi</strong>s maRali xelSeSlamdgradoba;<br />
kavSiris arxebSi signalebis <strong>da</strong>maxinjebebTan<br />
efeqturi brZolis SesaZlebloba;<br />
mravali abonentis erTdrouli muSaoba six-<br />
Siris saerTo zolSi arxebis koduri <strong>da</strong>yofis xarjze;<br />
sixSiris speqtris ufro efeqturi gamoyeneba<br />
SezRudul teritoriaze.<br />
nax. 1.8. signalis speqtris gar<strong>da</strong>qmna<br />
24<br />
sistemis xelSeSla<strong>da</strong>culoba - xelSeSlebis<br />
zemoqmedebasTan <strong>da</strong>pirispirebis saSualebaa. radiokavSiris<br />
arxSi <strong>da</strong>maxinjeba mniSvnelovanwilad<br />
ganpirobebulia signalebis mravalsxivuri gavr-<br />
celebiT, rodesac signali modis miRebis wertil-<br />
Si sxva<strong>da</strong>sxva gziT. mravalricxovani <strong>da</strong>brkolebe-<br />
bi<strong>da</strong>n areklebs mivyavarT miRebis wertilSi sxive-<br />
bis interferenciasTan, rac mniSvnelovnad arTulebs<br />
kavSiris sistemis muSaobas. milevis kompensacii-<br />
saTvis Cveulebriv zrdian sabazo sadguris ga<strong>da</strong>-<br />
cemis simZlavres 10...20 db-mde. rTuli signalebis<br />
gamoyeneba iZleva mravalsxivianobasTan brZolis<br />
ufro efeqtur saSualebas.<br />
rTuli signalebis gamoyenebisas SesaZlebelia<br />
calkeuli sxivebis signalebi gamoiyos saerTo in-<br />
terferenciuli suraTi<strong>da</strong>n miRebis dros korel-<br />
aciuli <strong>da</strong>muSavebis xarjze. nax.1.9,a-ze gamosaxulia<br />
kompleqsuri fazamani pulirebuli rTuli signa-<br />
li T xangrZlivobiT. nax.1.9,b-ze gamosaxulia sig-<br />
nali koreliatoris gamosasvlelze _korelatoris<br />
gamoZaxili. es gamoZaxili Seesabameba signalis av-<br />
tokorelaciur funqcias, romelsac aqvs 2T xangr-<br />
Zlivoba. masSi SeiZleba gamovyoT ori mkveTrad<br />
gansxvavebuli struqtura:<br />
1) signalis avtokorelaciuri funqciis centr-<br />
Si wvrili impulsis saxiT mkveTri naxtomi _ wodebuli<br />
centralur pikad, romlis amplitu<strong>da</strong>a R 0 ,<br />
xolo xangrZlivoba ukuproporciulia signalis<br />
speqtris siganisa: τ 0 =1/ F.<br />
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