Rejection of co-channel interference in the TDS-OFDM-based DTTB system

For the TDS-OFDM-based DTTB system, the receiver is extremely sensitive to the co-channel interference (CCI) introduced by analogue television (TV) service. Utilizing the line synchronization mechanism of analogue TV signal, the CCI is detected by means of the time-domain autocorrelation of the received signal. In this paper, we present a scheme of notch filtering to reject the CCI in the time domain, which considerably enforces the immunity of the TDS-OFDM receiver to the CCI. And the solution is verified in Chinese DTTB system, and simulation results indicate that the notch filtering improve the robustness against the CCI about 20dB in terms of signal interference ratio (SIR).