hat
Nan yon rezo frekans sèl tout transmeteur endividyèl yo dwe egzakteman tan senkronize. Chak transmetè dwe emèt senbòl OFDM absoliman idantik an menm tan an. Se modulasyon nan DVB-T estriktire nan ankadreman, yon sèl ankadreman yo te konpoze de 68 senbòl OFDM. Kat ankadreman fè moute yon sèl sa yo rele super-ankadreman ak de super-ankadreman fè moute sa yo rele mega-ankadreman (nan mòd 2k kat super-ankadreman yo). Ak konsiderasyon diferan dire tan nan OFDM senbòl la, ki depann sou paramèt yo nan itilize batman ak kodaj (mòd sa vle di nimewo nan transpòtè, to Kòd, entèval gad palè elatriye), tan dire a nan ankadreman sèl ka diferan, tou.
eng
In a single frequency network all the individual transmitters must be exactly time synchronized. Every transmitter must broadcast absolutely identical OFDM symbol at the same time. The DVB-T modulation is structured in frames, one frame being composed of 68 OFDM symbols. Four frames make up one so-called super-frame and two super-frames make up so-called mega-frame (in the mode 2k four super-frames). With regard to different time duration of the symbol OFDM, which depends on the parameters of used modulation and encoding (mode i.e. number of carriers, code rate, guard interval etc.), the time duration of single frame can be different, too.