Abstract : The first digital terrestrial TV system developed in Europe is DVB-T standard. OFDM modulation has been adopted by this standard. Some receiver algorithms associated to DVB-T system are based on pilot subcarriers which carry symbols known in advance by the receivers. In our study, we propose to spread each pilot symbols over several subcarriers using a precoding function. Hence, we develop a channel estimation method based on these pilots. Besides, an extension of this algorithm to space dimension is proposed. In a second part, carrier frequency offset and sampling frequency offset estimation algorithms processed before and after deprecoding function are developed. The last part focuses on the optimization of multiple antennas (MIMO) schemes in a single frequency network context. We introduce a 3D MIMO scheme which results from the combination of two different MIMO codes. An analysis on the choice of the codes constituting the 3D MIMO scheme distributed on two and three transmitters.