A loop interference canceller for the relay stations in an single frequency network for digital terrestrial broadcasting

In each relay station in an SFN (single frequency network) for DTB (digital terrestrial broadcasting), the loop interference is caused by the coupling from the transmitting antenna to receiving antenna. The interference must be reduced to an allowable level in order to avoid problems with distortion and oscillation. We propose a frequency-domain adaptive cancellation algorithm which is operated by using Scattered Pilot information in the OFDM signal. In this paper, the principle of the proposed algorithm is outlined and the usefulness of the algorithm is verified by the results of computer simulations.