mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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mowyobilobaTa Semadgenloba <strong>da</strong> funqcionirebis<br />
principebi TiTqmis mTlianad emTxveva GSM stan<strong>da</strong>rts.<br />
D-AMPS stan<strong>da</strong>rtis fiWuri kavSiris sistemis<br />
struqturuli sqema naCvenebia nax. 3.12-ze. am<br />
stan<strong>da</strong>rtSi analoguri salaparako signalis<br />
gar<strong>da</strong>qmnisaTvis cifrul formaSi gamoiyeneba VSELP<br />
koderi. salaparako diapazonis analoguri signali<br />
iyofa 20 mwm-is xanrgZlivobis segmentebad, romlebic<br />
gar<strong>da</strong>iqmneba 159 kodirebul bitad <strong>da</strong> romlebic<br />
Semdeg ga<strong>da</strong>icema 7,95 kbit/wm siCqariT. amis<br />
Semdeg es monacemebi ganicdis saarxo kodirebas,<br />
risTvisac gamoiyeneba xvevadi kodi siCqariT R=1/2.<br />
amasTan salaparako koderisagan wamosuli paketebi,<br />
romelic, rogorc aRiniSna, Sedgeba 159 bitisagan<br />
iyofa 2 jgufad: pirveli moicavs 77 bits; meore _<br />
82 bits. pirvel jgufSi xorcieldeba zemoT aRniSnuli<br />
xvevadi kodireba. amasTan 7 biti gamoiyeneba<br />
Secdomebis aRmosaCenad.<br />
nax. 3.12. D-AMPS (ADC) <strong>mobiluri</strong> fiWuri<br />
radiokavSiris gamartivebuli struqturuli sqema<br />
92<br />
meore jgufis bitebi ga<strong>da</strong>icema kodirebis gareSe.<br />
Sedegad, saarxo koderSi gar<strong>da</strong>qmnili 20 mwm xanrg-<br />
Zlivobis fragmenti warmodgenilia 260 bitiT, rac<br />
Seesabameba ga<strong>da</strong>cemis siCqares 13 kbit/wm-s. saarxo<br />
koderis gamartivebuli struqturuli sqema warmodgenilia<br />
nax. 3.13-ze. gamosasvleli siCqare (TDMA)<br />
kadris formirebis Sedegad Seadgens 16,2 kbit/wm-s<br />
1 abonentze. 260 kodirebuli bitiT Sedgenili paketi<br />
Semdgom ganicdis Senacvlebas, romlis principic<br />
mocemulia nax.3.14-ze. nebismieri salaparako fragmenti<br />
iyofa 2 Tanatol nawilad. erTi im nawilTagani<br />
ga<strong>da</strong>icema fragmentis sawyis fanjaraSi, xolo<br />
meore _ sami fanjariT ga<strong>da</strong>nacvlebul fanjaraSi.<br />
SetyobinebaTa radioarxSi ga<strong>da</strong>cemisaTvis gamoiyeneba<br />
speqtrul-efeqturi / 4 DQPSK modulacia,<br />
romelic realizdeba kvadraturuli sqemiT ga<strong>da</strong>mtan<br />
sixSireze pir<strong>da</strong>piri ga<strong>da</strong>cemiT.<br />
nax. 3.13. D-AMPS (ADC) stan<strong>da</strong>rtis saxazo kodirebis<br />
struqturuli sqema<br />
93
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