Patent ID: 8446987
Filing Date: 2013-05-21
Classification: H04L

Abstract:
1. A receiver for receiving 1024 QAM symbols, comprising: a 1024 QAM demodulator for down converting an incoming RF signal to baseband and converting said baseband signal to digital samples, and for performing equalization filtering, automatic gain control gain adjustments, timing recovery, and carrier phase and frequency recovery; a legacy DOCSIS compatible demapper and error correction decoder coupled to receive output samples from said 1024 QAM demodulator and functioning to deinterleave, descramble, differentially decode and Trellis decode the received samples and recover the codewords and use parity bits in said codewords to detect and correct errors therein so as to output data encoded in 256 QAM symbols which were transmitted as part of said 1024 QAM symbols; and means for recovering data in new data symbols, which were vector summed with said 256 QAM symbols at a headend transmitter, based at least in part upon an error signal generated by a 256-QAM slicer coupled to receive said output samples from said 1024 QAM demodulator.