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Frame structure for a QAM system

  • US 9,160,601 B2
  • Filed: 06/30/2014
  • Issued: 10/13/2015
  • Est. Priority Date: 01/30/2009
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a QAM demapper that extracts a trellis coded data frame from modulation symbols in a signal received by a modem using transmission mode information provided in the signal, the transmission mode information comprising a trellis code rate and a QAM constellation used to produce the trellis coded data frame, wherein the transmission mode information is provided in a synchronization packet that comprises different binary sequences for real and imaginary parts of the modulation symbols; and

    a Viterbi decoder that extracts a frame comprising a plurality of Reed-Solomon (RS) packets from the trellis coded data frame using the trellis code rate, wherein each of a sequence of frames extracted by the Viterbi decoder comprises a constant number of RS packets regardless of transmission mode of the each frame.

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