Equalizer with data recycling algorithm for fast convergence in 8-VSB DTV systems

The 8-vestigial sideband modulation (VSB) for digital television systems transmits a training sequence called field sync every 313 segments with a period of 24.2 ms. However, the field sync sequence is not long enough to guarantee the operation of an equalizer. So it takes many field sync sequences for the convergence of the equalizer especially in severely distorted channel conditions. In this paper, an algorithm called data recycling is proposed for fast convergence of the equalizer in 8-VSB systems. The data recycling algorithm utilizes only one field sync sequence for several times thereby reducing the convergence time for the equalizer. The control algorithm for the operation of the equalizer is also proposed with comparison of conventional equalizer.