mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
mravalsadguriani SeRweva arxebis droiTi gancalkavebiT<br />
(TDMA-Time Division Multiple Access).<br />
zoga<strong>da</strong>d signalebis droiT struqturas aqvs<br />
nax.3.7-ze naCvenebi saxe. Tav<strong>da</strong>pirvelad analoguri<br />
salaparako signali gar<strong>da</strong>iqmneba cifrul TanmimdevrobaSi,<br />
romelsac ukeTdeba <strong>da</strong>Sifvra <strong>da</strong> kodireba,<br />
rac aucilebelia informaciis Secdomebisagan<br />
<strong>da</strong>cvisaTvis ga<strong>da</strong>cemisa <strong>da</strong> miRebis procesSi. am<br />
mizniT gamoiyeneba:<br />
_ blokuri kodireba _ miRebisas Secdomebis<br />
swrafi aRmoCenisaTvis;<br />
_ xvevadi kodireba _ erTeulovani Secdomebis<br />
gasworebisaTvis;<br />
_ Senacvleba _ paketuri Secdomebis erTeulovan<br />
SecdomebSi gar<strong>da</strong>qmnisaTvis.<br />
am gar<strong>da</strong>qmnebis Sedegad TiToeuli anaTvali warmodgeba<br />
<strong>da</strong>Sifruli Setyobinebis saxiT, romelic<br />
Sedgeba 114 bitisagan _ ori 57 bitiani <strong>da</strong>moukidebeli<br />
bloki (nax. 4.7), romlebic erTmaneTisagan gamoyofilia<br />
etalonuri mimdevrobiT (26 biti). am mimdevrobis<br />
miRebisas ganisazRvreba <strong>da</strong>maxinjebis xasiaTi<br />
signalis ganawilebis traqtSi <strong>da</strong> Sedegad<br />
mimRebis maxasiaTeblebi formirdeba drois mocemul<br />
momentSi muSa pirobebis Sesabamisad.<br />
kavSirisa <strong>da</strong> marTvis arxebiT informaciis ga<strong>da</strong>cemisaTvis,<br />
agreTve, ga<strong>da</strong>mtani sixSiris SewyobisaTvis,<br />
droiTi sinqronizaciis uzrunvelyofisaTvis <strong>da</strong><br />
kavSiris arxSi SeRwevisaTvis gamoiyeneba 5 tipis<br />
droiTi intervali _ `fanjara~:<br />
_ NB (Normal Burts)-normaluri droiTi intervali;<br />
_ SB (Synchronisation Burts)-droiTi sinqronizaciis<br />
intervali;<br />
78<br />
_ DB (Dummy Burts)-<strong>da</strong>sayenebeli intervali;<br />
_ FCB (Frequency Correction Burts) _ sixSiris Sewyobis<br />
droiTi intervali.<br />
GSM stan<strong>da</strong>rtSi erT salaparako arxSi ga<strong>da</strong>cemisaTvis<br />
gamoyeneba normaluri droiTi intervali<br />
NB (paketi) 0,577 mwm-is xanrgZlivobiT, romelic Seicavs:<br />
<strong>da</strong>Sifruli informaciis 114 bits; or napira<br />
kombinacias (TB-Tail Bits) 3-3 biti TiToeulisaTvis;<br />
or sakontrolo bits, romelic yofs erTmaneTisagan<br />
Setyobinebis <strong>da</strong>Sifrul bitebsa <strong>da</strong> etalonur<br />
mimdevrobas; <strong>da</strong>cvis intervals GP (Guard Period) 2,25<br />
bitis ga<strong>da</strong>cemis drois intervaliT. es niSnavs, rom<br />
NB intervali Seicavs 156,25 bits, xolo erTi bitis<br />
xangrZlivoba Seadgens 3,69 mkwm-s.<br />
nax. 3.7. GSM stan<strong>da</strong>rtSi kadrebis struqtura <strong>da</strong><br />
signalebis formireba<br />
79
Change language