Application of 4K-QAM, LDPC and OFDM for Gbps Data Rates over HFC Plant (2013)

By David John Urban, Comcast

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

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