This paper describes the application of 4096-QAM, low density parity check codes (LDPC), and orthogonal frequency division multiplexing (OFDM) to transmission over a hybrid fiber coaxial cable plant (HFC). These techniques enable data rates of several Gbps.
A complete derivation of the equations used for log domain sum product LDPC decoding is provided. The reasons for selecting OFDM and 4K-QAM are described.
Analysis of performance in the presence of noise taken from field measurements is made