mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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sa<strong>da</strong>c m aris erTi mimdevrobis droiTi biji<br />
meoris mimarT. aqe<strong>da</strong>n gamomdinare CamovayaliboT<br />
urTierTkorelaciuri funqciisadmi moTxovnileba<br />
Semdegi saxiT:<br />
R max R m min<br />
b<br />
k<br />
l<br />
kl<br />
.<br />
urTierTkorelaciuri funqciis amonavardnis<br />
maqsimaluri done un<strong>da</strong> iyos rac SeiZleba mcire;<br />
avtokorelaciuri funqciis gverdiTi furclebis<br />
maqsimaluri done un<strong>da</strong> iyos rac SeiZleba mcire.<br />
CDMA sistemebSi farTo gamoyeneba aqvT N mimdevrobaze<br />
<strong>da</strong>fuZnebul binarul kodebs. es ganpirobebulia<br />
perioduli avtokorelaciuri funqciebis<br />
mqone iseTi kodebiT, romlebisTvisac:<br />
<br />
R , 1<br />
na m 1/<br />
N ,<br />
m<br />
mod N<br />
m<br />
mod N<br />
.<br />
yoveli muSa arxisaTvis gamoiyofa samisamarTo<br />
mimdevroba. CDMA sistemebs SeswevT unari imuSaon<br />
sxva radioteqnikuri saSualebebis diapazonSi. kav-<br />
Siris aseTi <strong>sistemebi</strong> uzrunvelyofen usafrTxoebis<br />
maRal xarisxs <strong>da</strong> ga<strong>da</strong>cemuli informaciis konfidencialurobas.<br />
CDMA sistemebma farTo gamoyeneba<br />
hpoves kavSiris Si<strong>da</strong> sistemebSi, ris Sedega<strong>da</strong>c<br />
farTozolovani signalebi ganicdian nakleb<br />
<strong>da</strong>nakargebs maTi gavrcelebis gzaze <strong>da</strong> iZlevian<br />
<strong>da</strong>maxinjebebTan efeqturi brZolis SesaZleblobas.<br />
g) signalis xelSeSlasTan fardoba kavSiris arxebSi<br />
signalis xelSeSlasTan fardoba uku arxSi<br />
mimReb mxareze <strong>da</strong>brkolebebisa <strong>da</strong> mezobeli arxebis<br />
signalebis zemoqmedeba iwvevs xmaurs mimRebis<br />
32<br />
saxazo traqtSi. korelatoris gamosasvlelze s/x<br />
2 2E<br />
fardoba q<br />
Ni<br />
N0<br />
<br />
;<br />
sa<strong>da</strong>c N i / 2 _ aris xmauris simZlavris ormxrivi<br />
speqtraluri simkvrive <strong>da</strong> Sesabamisad arxebsSorisi<br />
xmauri; E—informaciuli gzavnilis erTi simbolos<br />
energia (nax. 1.11).<br />
xmauris simZlavris <strong>da</strong> urTierT<strong>da</strong>brkolebaTa<br />
speqtraluri simkvriveebi tolia:<br />
Tburi xmauris simZlavris speqtruli simkvrive<br />
0 K T =K T w 1<br />
b x b 0 ,<br />
N <br />
23<br />
sa<strong>da</strong>c K =1.38 10 b <br />
_ bolcmanis mudmivaa;<br />
T =T w 1<br />
x 0 _ mimRebis saxazo traqtis xmauris temperatura;<br />
T 0 =290K, w _ mimRebis saxazo traqtis xmauris<br />
koeficienti.<br />
urTierTxelSeSlebis simZlavris speqtraluri<br />
simkvrive:<br />
N<br />
0<br />
<br />
M <br />
s<br />
BS<br />
1 P M P<br />
rx min<br />
s rx <br />
F<br />
F<br />
BS<br />
sa<strong>da</strong>c M s 1 P _ am av e fiWi s aq t i u r i<br />
rx min<br />
abonentebi<strong>da</strong>n momdinare urTierTxelSeSlebis<br />
BS<br />
simZlavrea; M sP<br />
_ urTierTxelSeSlebis<br />
rx min<br />
simZlavrea, romelic momdinareobs mezobeli fiWis<br />
aqti uri abonente bisagan, _koefic ient ia;<br />
M s _mocemuli fiWis aqtiuri abonentebis ricxvia;<br />
BS<br />
F_signalis speqtris siganea; Prx _ signalis<br />
min<br />
minimaluri moTxovnili simZlavrea mimRebis saxazo<br />
traqtis Sesasvlelze.<br />
informaciuli gzavnilis erTi simbolos energia<br />
33<br />
BS<br />
min<br />
,
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