Achieving Mobility For Dvb-T By Signal Processing For Doppler Compensation

Mobile reception of DVB-T signal is significantly affected by the fastchanging transmission channel. As a result, existing equipment that is suited for static reception does not guarantee the necessary quality of service (QoS) for speeds beyond 30 km/h. In order to achieve higher speeds, most of the current solutions propose to use two antennas at the receiver and a more elaborate signal processing for the channel tracking. In this paper we consider a signal processing technique that specifically addresses the time-varying nature of the channel and allows to reach speed beyond 100 km/h on a receiver equipped with a single antenna. The proposed scheme performs the cancellation of the interference due to the channel variations and the channel estimation. The building blocks of the new algorithm have been optimised in order to reduce the complexity. A combination of both the new signal processing and the use of two antenna at the receiver has also been considered, in order to achieve high speed also for the configurations of the DVB-T which are most affected by mobility. Simulations show that the use of the new signal processing yields a significant improvement in terms of maximum speed that can be reached with an appropriate QoS