mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Setyobinebaze 320 mwm-iT adre. amitom, mobilur sadgurs<br />
aqvs sakmarisi dro Setyobinebis dekodirebisaTvis<br />
<strong>da</strong> informaciis ga<strong>da</strong>tvirTvisaTvis registrSi.<br />
amrigad, miiRweva misi sinqronizacia qselur<br />
drosTan. amis Semdeg <strong>mobiluri</strong> sadguri iwyebs<br />
gamoZaxebis erT-erTi arxis monitorings.<br />
CDMA stan<strong>da</strong>rtis mowyobilobis Semadgenloba<br />
ZiriTa<strong>da</strong>d igivea, rac GSM stan<strong>da</strong>rtis, misi struqturuli<br />
sqema mocemulia nax. 3.24-ze.<br />
nax. 3.24. CDMA stan<strong>da</strong>rtis qselis konfiguracia<br />
rogoc zemoT aRiniSna, CDMA stan<strong>da</strong>rtSi gamoiyeneba<br />
mravalobiTi SeRweva arxebis koduri gancalkevebiT,<br />
romelic efuZneba farTozolovani signalebis<br />
gamoyenebas. am stan<strong>da</strong>rtSi miiRweva laparakis<br />
ufro maRali xarisxi vidre GSM stan<strong>da</strong>rtSi,<br />
amasTan, analoguri salaparako signalebis cifrul<br />
formaSi gar<strong>da</strong>qmnisaTvis gamoiyeneba vokoderi kodirebis<br />
cvladi siCqariT, romelic efuZvneba koduri<br />
agznebiT wrfivi winaswarmetyvelebis algoriTmis<br />
gamoyenebas _ CELP (Code Excited Linear Predictive).<br />
es algoriTmi iyenebs a<strong>da</strong>mianis laparakis<br />
Taviseburebebs. vokoderis saSualebiT salaparako<br />
signalis sawyisi 64 kbiti/wm cifruli nakadi<strong>da</strong>n<br />
miiReba 8 an 13 kbiti/wm nakadi.<br />
106<br />
nax. 3.25. rbili estafeturi ga<strong>da</strong>cemis princi pi<br />
CDMA stan<strong>da</strong>rtis mimRebebSi gaTvaliswinebulia<br />
ramdenime korelatoris gamoyeneba erTdroulad.<br />
mimRebebma, miRebisa <strong>da</strong> <strong>da</strong>muSavebis ramdenime arxiT<br />
miiRes <strong>da</strong>saxeleba _ `Rake-mimRebi~. maT gaaCniaT<br />
miRebis 4 arxi, romelTagan samSi erTdroulad<br />
muSavdeba sami yvelaze Zlieri signali (meoTxe<br />
arxSi mudmivad midis Zebna im signalisa, romelsac<br />
aqvs samis Semdeg ufro maRali done). es signalebi<br />
aijameba <strong>da</strong> amrigad sistemaSi realizdeba miRebis<br />
droiTi <strong>da</strong>Zvris princi pi. es princi pi ilustrirebulia<br />
nax. 3.25-ze.<br />
CDMA stan<strong>da</strong>rtis sistemebSi gamoiyeneba kodirebis<br />
sxva<strong>da</strong>sxva meTodebi nax. 3.26-ze <strong>da</strong> 3.27-ze<br />
mocemulia Sesabamisad kodirebis sqemebi pir<strong>da</strong>pir<br />
<strong>da</strong> ukuarxSi. pir<strong>da</strong>pir arxSi monacemTa ga<strong>da</strong>cemis<br />
sabazo siCqare Seadgens 9,6 kbiti/wm-s (rac miiReba<br />
8,55 kbiti/wm siCqaris cifrul nakadze <strong>da</strong>matebiTi<br />
makoreqtirebeli orobiTi simboloebis <strong>da</strong>matebiT).<br />
107
Change language