A timing recovery for return channel of digital video broadcasting

We investigate the design of an interpolation filter of a multi-frequency TDMA (MF-TDMA) demodulator which is applied to DVB-RCS (digital video broadcasting-return channel system via satellite). If sampling is not synchronized to the data symbols, timing adjustment in the digital receiver must be performed by interpolation. It is impossible for the conventional ideal (sinc) interpolation filter coefficient actually to extend to infinity. We propose two interpolation filters (the Kaiser window interpolation filter and the sinc interpolation filter using the Kaiser window) for low side-lobes. Simulation results show that the performance improvement is realized by employing the proposed (optimal) interpolation filter.