Channel Estimation And Equalization About China Terrestrial Television Broadcasting System

China digital television terrestrial broadcasting standard GB20600-2006 is based on TDS-OFDM (Time-Domain Synchronous orthogonal Frequency Division Multiplexing) systems. In this system, pseudonoise (PN) sequences, rather than cyclic prefixes, are inserted as guard interval between consecutive inverse discrete Fourier transformed (IDFT) symbol blocks. So, due to non-cyclic property of this system's signal, the simple channel estimation and equalization techniques for conventional cyclic prefixed OFDM (CP-OFDM) can not be applied to TDS-OFDM. Firstly, this paper introduces the signal block structure of the GB20600-2006 standard, and points out the advantages of this standard. Then, this thesis presents a detail step of a channel estimation and equalization method. Channel estimation depends on time domain correlation and iterative interference cancellation techniques, while equalization adopts the frame body cyclic restoration technique in the presented method. Finally, the simulation results about channel estimation and equalization based on GB20600-2006 system is given. The simulation results confirm the validity and feasibility of these channel estimation and equalization approaches.