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
By clicking the "Download Paper" button, you are agreeing to our terms and conditions.