mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
mobiluri telekomunikaciis miwispira da Tanamgzavruli sistemebi
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nax. 1.9. rTuli signalebi <strong>da</strong><br />
mravalsxivianobasTan brZola<br />
2) avtokorelaciuri funqciis <strong>da</strong>rCenili nawili,<br />
romelic warmoadgens gverdiTi furclebis<br />
erTobliobas maqsimaluri doniT R a .<br />
nax. 1.9.g-ze gamosaxulia koreliatoris gamoZaxili<br />
ramdenime signalze. Tu sxivebs Soris <strong>da</strong>yovneba<br />
t metia centraluri pikis xangrZlivobaze,<br />
maSin sxivebi SeiZleba gamoiyos. mravalsxivianobasTan<br />
brZolis aseTi principi iqna gamoyenebuli<br />
pirvelad farTozolovani signalebiT kav-<br />
Siris sistemaSi.<br />
26<br />
a) rTuli signalebis <strong>da</strong>muSavebis ZiriTadi<br />
princi pebi<br />
cnobilia sistemebSi rTuli signalebis <strong>da</strong>muSavebis<br />
ramodenime xerxi, magram yvela SemTxvevaSi aucilebelia<br />
ganxorcieldes:<br />
signalis bazis gafarToeba kodis meSveobiT;<br />
ga<strong>da</strong>mcemi <strong>da</strong> mimRebi mxareebis koduri sinqronizacia;<br />
sistemaSi urTierTxelSeSlebis donis Senar-<br />
Cuneba <strong>da</strong>saSveb farglebSi;<br />
optimaluri koduri mimdevrobebis gamoyeneba<br />
sistemis maxasiaTeblebis gaumjobesebis mizniT.<br />
arsebobs ori ZiriTadi xerxi signalebis bazis<br />
gafarToebisaTvis:<br />
ga<strong>da</strong>mtani sixSiris swrafi naxtomiseburi cvlileba;<br />
sixSiris speqtris pir<strong>da</strong>piri gafarToeba.<br />
ga<strong>da</strong>mtani sixSiris naxtomiseburi cvlilebis<br />
dros Setyobinebis yovel simbolos ga<strong>da</strong>scemen diskretul<br />
sixSireTa nakrebis meSveobiT.<br />
meore xerxis SemTxvevaSi viwrozolovan signals<br />
amravleben fsevdoSemTxveviT mimdevrobaze, romelic<br />
Sesdgeba N elementiani jgufebisagan (Cipebisagan),<br />
romelTa ganmeorebis periodi Т = N , sa<strong>da</strong>c erTi<br />
elementis xangrZlivobaa. am SemTxvevaSi signalis<br />
baza B ricxobrivad fsevdoSemTxveviTi mimdevrobis<br />
periodSi elementebis N raodenobis tolia.<br />
praqtikaSi xSirad iyeneben binarul fsevdoSemTxveviT<br />
mimdevrobas, romlis Semadgeneli elementebi<br />
pirobiTad SeiZleba aRiniSnos `+1~ <strong>da</strong> `-1~ simboloebiT.<br />
aseT mimdevrobebs aqvT mTeli rigi saWiro<br />
Tvisebebi:<br />
fsevdoSemTxveviT mimdevrobaSi `-1~ <strong>da</strong> `+1~ elementebis<br />
raodenoba <strong>da</strong>axloebiT Tanabaria;<br />
27
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