Patent ID: 7073116
Filing Date: 2006-07-04
Classification: H03M,H04L

Abstract:
1. A hierarchical QAM transmission system comprising: a hierarchical QAM transmitter responsive to a first and a second data stream, for transmitting a hierarchical QAM signal comprising a level 1 signal, representing the first data stream, having an uncoded first bit error rate performance, and a level 2 signal, representing the second data stream, having an uncoded second bit error rate performance lower than the first bit error rate performance; a hierarchical QAM receiver, coupled to the hierarchical QAM transmitter, for receiving the hierarchical QAM signal and producing received first and second data streams; first error detection and correction circuitry processing the first data stream, for encoding the first data stream by a code having a first detection and correction power; and second error detection and correction circuitry processing the second data stream for encoding the second data stream by a code having a second error detection and correction power; wherein the coded bit error rate performance of the first data stream is closer to the coded bit error rate performance of the second data stream than the uncoded bit error rate performance of the first data stream is to the uncoded bit error rate performance of the second data stream.