Influence of guard interval duration to interchannel interference in DVB-T2 signal

Systems for digital television signals transmission, as the most broadband transmission systems, use orthogonal frequency-division multiplexing (OFDM). Multipath propagation problem, characteristic of wireless transmission, can be efficiently solved using a cyclic prefix (CP), which is transmitted during the guard interval (G). Temporary symbols extension, to the removal of CP in the receiver, disturbs orthogonality and introduces interference between subcarriers. Matlab model of OFDM transmitter and receiver for the first and the second generation digital terrestrial television broadcasting system is implemented. Guard interval using effect is observed. Frequency characteristics are analyzed, and quantified with bit error rate (BER) in receiver.