| 摘要 |
<p>Apparatus (130) and method for receiving a QAM signal using a backward compatible hierarchical coding scheme to increase data transmission using finer constellations, while maintaining compatability with existing Direct Broadcasting Satellite (DBS) systems. The apparatus employs multiple stages of decoders (146,170) such that the finer constellations of the QAM signal are unraveled at different stages.</p> |
