mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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3.4. <strong>mobiluri</strong> <strong>telekomunikaciis</strong> meore<br />
Taobis (2G) CDMA stan<strong>da</strong>rtis fiWuri<br />
<strong>sistemebi</strong><br />
<strong>mobiluri</strong> fiWuri radiokavSiris sistema<br />
CDMA-s agebis princi pi.<br />
CDMA stan<strong>da</strong>rtSi, arxebis koduri <strong>da</strong>yofisaTvis<br />
gamoiyeneba uolSis orTogonaluri kodebi. uol-<br />
Sis kodebi formirdeba uolSis matricis striqoneb-<br />
isagan:<br />
00<br />
00<br />
<br />
01<br />
01<br />
WL<br />
00<br />
11<br />
<br />
<br />
<br />
01<br />
10<br />
<br />
am matriciis gansakuTrebuloba mdgomareobs ima-<br />
Si, rom misi yoveli striqoni orTogonaluria nebismieri<br />
striqonis mimarT, romelic miRebulia<br />
logikuri uaryofis operaciis meSveobiT. IS-95 stan<strong>da</strong>rtSi<br />
gamoiyeneba 64-e xarisxis matrica. mimRebis<br />
gamosasvlelze signalebis gamosayofad gamoiyeneba<br />
cifruli filtri. orTogonaluri signalebis<br />
SemTxvevaSi filtri SeiZleba aiwyos im<strong>da</strong>gvarad,<br />
rom mis gamosasvlelze yovelTvis iqneba logikuri<br />
nuli, im SemTxvevis gamoklebiT, roca miiReba is<br />
signali, romelzec isaa awyobili. uolSis mixedviT<br />
kodireba gamoiyeneba pir<strong>da</strong>pir arxSi (sabazo<br />
sadguri<strong>da</strong>n saabonento terminalisaken) momxmarebelTa<br />
gamoyofisaTvis. im sistemebSi, sa<strong>da</strong>c gamoiyeneba<br />
IS-95, yvela saabonento sadguri muSaobs erTdroulad,<br />
erTi <strong>da</strong> igive sixSireTa zolSi.<br />
CDMA stan<strong>da</strong>rtis sistemis gamartivebuli struqturuli<br />
sqema mocemulia nax. 3.18-ze. informaciu-<br />
98<br />
li signali kodirdeba uolSis mixedviT <strong>da</strong> Semdgom<br />
erTiandeba ga<strong>da</strong>mtanTan, romlis speqtri winaswar<br />
farTovdeba fsevdoSemTxveviTi mimdevrobis wyaros<br />
signalze ga<strong>da</strong>mravlebiT. yovel informaciul signals<br />
eniWeba uolSis sakuTari kodi, Semdgom isini<br />
erTiandeba ga<strong>da</strong>mcemSi <strong>da</strong> filtris gavliT xmauris<br />
signalis msgavsad miewodeba ga<strong>da</strong>mcem antenas.<br />
amrigad, mimRebis Sesasvlels miewodeba sasargeblo<br />
signali-mezobeli fiWebis sabazo sadgurebis<br />
fonuri xmauri <strong>da</strong> sxva <strong>mobiluri</strong> abonentebis xelisSemSleli<br />
signalebi. maRalsixSiruli filtraciis<br />
Semdeg signali miewodeba korelators, sa<strong>da</strong>c<br />
xdeba speqtris SekumSva <strong>da</strong> cifrul filtrSi<br />
sasargeblo signalis gamoyofa winaswar mocemuli<br />
uolSis kodis gamoyenebiT. xelSeSlis speqtri<br />
izrdeba <strong>da</strong> korelatoris gamosasvlelze miiReba<br />
xmauri. praqtikulad, mobilur sadgurebSi gamoiyeneba<br />
ramdenime korelatori<br />
nax. 3.18. CDMA stan<strong>da</strong>rtis sistemis muSaobis<br />
princi pi<br />
99
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