Design of Interpolated Two-Dimensional Filters with Nonrectangular Lattice for Digital Terrestrial Television Broadcasting

We investigated channel estimation with scattered pilots (SPs) in digital terrestrial television broadcasting (DTTB) and the performance of a receiver with a two-dimensional (2D) filter. High-accuracy interpolation is necessary because we perform channel equalization with SPs, which are inserted in transmit signals nonrectangularly. This interpolation is performed with a 2D filter that has a nonrectangular spectrum. However, the generation of the 2D filter involves heavy computational complexity. We propose a method of reducing the computational complexity by designing separable 2D filters. In addition, we present simulation results that compare our method with some conventional methods and show its effectiveness