OFDM for Digital TV Terrestrial Broadcasting

This paper treats the problem of digital TV terrestrial broadcasting in presence of co-channel interference from analogue TV services. The channel capacity is calculated for the optimum distribution of the transmitted power. An OFDM scheme is presented which is designed to be robust to the analogue TV interference. Power and number of bits per symbol are assigned to each OFDM channel to give the maximum data rate for a given signal to interference ratio. Simulations of the proposed scheme, for 8 MHz bandwidth and interference from a system G PAL signal, show that acceptable error rate can be achieved for e.g. 27 Mbit/s at a signal to interference ratio of-6 dB. The proposed scheme is suitable for the next generation terrestrial TV networks which are going to coexist with the current analogue systems.