mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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adiokavSiris qselebis abonentebis urTierTSoris<br />
qseluri roumingi.<br />
CEPT-is 1980 wlis rekomen<strong>da</strong>ciis Sesabamisad, saer-<br />
To evropuli fiWuri <strong>sistemebi</strong>s miwisze<strong>da</strong> <strong>mobiluri</strong><br />
kavSirisaTvis GSM stan<strong>da</strong>rtSi gaTvaliswinebulia<br />
ga<strong>da</strong>cemebis muSaoba or sixSirul diapazon-<br />
Si: ga<strong>da</strong>cema <strong>mobiluri</strong> sadguri<strong>da</strong>n sabazo sadgur-<br />
Si xorcieldeba _ 890-915 mhc-ze, xolo sabazo sadguri<strong>da</strong>n<br />
mobilur sadguramde (abonentamde) _ 935-<br />
960 mhc-ze.<br />
amasTan, kavSiris seansis dros arxebis ga<strong>da</strong>rTvisas,<br />
am sixSireebs Soris sxvaoba konstantaa <strong>da</strong><br />
toli 45 mhc-is. mezobel arxebs Soris sixSireTa<br />
sxvaoba (<strong>da</strong>Zvra) aris 200 khc-is toli. amrigad, miReba/<br />
ga<strong>da</strong>cemisaTvis gamoyofil sixSireTa zolSi (25 mhc)<br />
SeiZleba ganTavsdes kavSiris 124 radioarxi.<br />
GSM stan<strong>da</strong>rtSi gamoiyeneba TDMA (Tiame Division<br />
Multiplexing Access _ mravlobiTi SeRweva arxebis<br />
droiTi gancalkevebiT), rac saSualebas iZleva erT<br />
ga<strong>da</strong>mtan sixSireze ganTavsdes 8 salaparako arxi<br />
erTdroulad. gar<strong>da</strong>qmnis mowyobilobad gamoiyeneba<br />
salaparako kodeki RPE-LTR regularuli impulsuri<br />
agznebiT <strong>da</strong> ga<strong>da</strong>cemis siCqariT 13 kbit/wm-Si.<br />
salaparako signalebis <strong>da</strong>muSaveba aRniSnul<br />
stan<strong>da</strong>rtSi xdeba salaparako signalebis wyvetili<br />
ga<strong>da</strong>cemis DTX-(Discontinuous Transmission) sistemebSi<br />
miRebuli wesiT, romelic uzrunvelyofs ga<strong>da</strong>cemis<br />
CarTvas mxolod maSin, roca momxmarebeli iwyebs<br />
laparaks <strong>da</strong> gamorTvas pauzebSi <strong>da</strong> laparakis<br />
<strong>da</strong>srulebisas (nax. 3.1.).<br />
66<br />
<strong>da</strong>balsixSiruli<br />
Sesasvleli<br />
gamaZlierebeli<br />
DTX<br />
marTva <strong>da</strong><br />
muSaoba<br />
VAD<br />
salaparako<br />
signalis<br />
koderi<br />
komfortuli<br />
xmauris<br />
maformirebeli<br />
salaparako<br />
signalis<br />
eqstrapolacia<br />
salaparako<br />
signalis<br />
koderi<br />
komfortuli<br />
xmauris<br />
maformirebeli<br />
67<br />
DTX<br />
marTva <strong>da</strong><br />
muSaoba<br />
gamaZlierebeli<br />
nax. 3.1. GSM stan<strong>da</strong>rtSi laparakis <strong>da</strong>muSavebis<br />
procesis struqturuli sqema<br />
DTX sistema imarTeba laparakis aqtiurobis deteqtoriT<br />
VAD (Voice Activity Detector), romelic uzrunvelyofs<br />
rogorc xmauriani laprakis, ise laparakis<br />
gareSe xmauris intervalebis aRmoCenas <strong>da</strong> gamoyofas<br />
im SemTxvevaSic ki, roca xmauris done laparakis<br />
donis Tanazomadia.<br />
radioarxebSi Secdomebisagan <strong>da</strong>cvis mizniT gamoiyeneba<br />
blokuri <strong>da</strong> xvevadi kodireba SenacvlebiT.<br />
kodirebisa <strong>da</strong> Senacvlebis efeqturobis amaRleba<br />
<strong>mobiluri</strong> sadgurebis mcire siCqariani ga<strong>da</strong>adgilebisas<br />
miiRweva seansis procesSi muSa sixSireeb
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