Patent ID: 9160601
Filing Date: 2015-10-13
Classification: H04L,H04N

Abstract:
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.