TECHNICKÁ UNIVERZITA V KOŠICIACH FAKULTA ELEKTROTECHNIKY A INFORMATIKY Katedra elektroniky a multimediálnych telekomunikácií

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1 TECHNICKÁ UNIVERZITA V KOŠICIACH FAKULTA ELEKTROTECHNIKY A INFORMATIKY Katedra elektroniky a multimediálnych telekomunikácií Vedúci DP : prof. Ing. Stanislav Marchevský, CSc. Konzultant : Ing. Lukáš Sendrei Študent : Bc.František Dely 1/9

2 Cieľ práce : Oboznámenia sa s DVB-T/T2 a LTE Čo to je, výhody/nevýhody, prečo práve tie 2 systémy Koexistencia medzi DVB-T/T2 a LT800 Kde dochádza ku interferencií a prečo Možné riešenia problému Typy riešení, možnosti testovania, pokrytie atď... 2/9

3 DVB-T/T2: Digital Video Broadcasting Terrestrial (DVB-T) prechod z analog/digital na Slovensku Využitie UHF spektra na prenos signalu ( Mhz) Možnosť prenášať audio, video a ine dáta v digitalnej podobe pomocou MPEG s využítím OFDM modulácie. Convolučne kódovanie + Red Solomonové kódy (Oprava) DVB-T2 Nove možnosti efektivne využitie kodekov MPEG-2,4 a H možnosť prenosu v HDTV(High definiton TV) Oproti DVB-T využíva 256 stavovú QAM=prenos viac dát Vačia prenosová rýchlosť, širka pásma, kapacita a rýchlosť kodovania. LDPC(Lower density parity check) a BCH na opravu chýb 3/9

4 LTE (Long Term Evolution): Najnovší štandard mobilnej technologie, časti GSM 4G Oveľa rýchlejšia technlogia ako známa 3G(UMTS) a jej rozšírenia HSPA, HSPA+ s menšou latenciou Technologia urcena na vyskorychlostný internet v mobilných sietiach s rýchlosťou sťahovania až 21,6 a nahrávania 7,2 MB/s Menej technlogockých prvkov vačší výkon, šetrenie baterie Využíva OFDMA(Orthogonal frequency division multiplex) Delenie na mensie signaly nahustene na sebe, Prisposobenie sa skutocnym podmienkam a využiva efektívne frekv.kanály podľa ich šírky prenosova rýchlosť. 4/9

5 Koexistencia medzi LTE800 a DVB-T/T2 ITU World Radio Conference (2007) - priradenie vrchnej časti UHF spektra novej mobilnej 4G sieti. Zrušenie TV knálov Vznik interferencie medzi 60 kanálom digitalnej TV a LTE pri 800 Hz Silny LTE800 signal ruší DVB-T signál, dokonca ho prekryje len 1 MHz ochranny interval, veľa bazových stanic 4G 5/9

6 Koexistencia medzi LTE800 a DVB-T/T2 DVB-T prijímač v blizkosti vysielača LTE (bunkovy system) vysoké rušenie LTE vysielač je rušený DVB-T prijímačom( settop box) 6/9

7 Koexistencia medzi LTE800 a DVB-T/T2 Možnosti riešenia : Filtracia pomocou filtra na Bázových staniciach LTE Filter priamo na antene DVB-T prijímačov (parabola) Filter medzi parabolov a settop boxom, ktorý zamedzí príjem frekvencií pod 790 MHz. Zníženie vysielacieho výkonu Bázových staníc, na miestach kde dochádza k najvačšej interferencíí Menšie pokrytie mobilnej siete menšia rýchlosť prenosu Zmena polarizacií antén Ina na BS a ina na DVB-T Problem pri veľkých DVB-T vysielačoch a prijímačoch, ktoré je obtiažne meniť Existujú aj iné spôsoby zníženia interferencie, azda najelpšia je vytvoriť aspoň 2MHz ochranný interval medzi LTE a DVB-T kanálom 60. 7/9

8 Použitá literatúra [1] DotEcon Ltd: 800MHz auction: Co-existence of LTE systems in MHz with Digital Terrestrial Television, August [2] Kresimir Sakic, Sonja Grgic, The Influence of the LTE System on DVB-T Reception, September 2010, Zadar, Croatia [3] Toshiba: Interference to TV signals (Long Term Evolution- LTE) < [4] PROGIRA: Interference from future mobile network services in frequency band MHz to digital TV in frequencies below 790 MHz, May 2009 [5] TECHNOPEDIA, Cory Janssen: Digital Video Broadcasting- Terrestrial (DVB-T) < [6] Igor Funa, DVB-T, < [7] Irini S.Reljn, Alexander N. Sugaris, DVB STANDARD DEVELOPMENT, October 2009, [8] Enensys technologies: General overview of DVB-T2 standard, < 8/9

9 TECHNICKÁ UNIVERZITA V KOŠICIACH FAKULTA ELEKTROTECHNIKY A INFORMATIKY Katedra elektroniky a multimediálnych telekomunikácií František Dely /9

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