Multi-Class Coded Layered Asymmetrically Clipped Optical OFDM

Multi-class channel coded layered asymmetrically clipped optical orthogonal frequency-division multiplexing (LACO-OFDM) is proposed, where the achievable rate of the system is derived based on our mutual information analysis. We conceive a multi-class channel encoding scheme integrated with the layered transmitter. At the receiver, both the coded and uncoded likelihood ratios are extracted for inter-layer interference cancellation and symbol detection, respectively. Simulations are conducted, and the results show that our design approaches the achievable rate within 1.1 dB for 16-QAM fourlayer LACO-OFDM with the aid of a half-rate eight-iteration turbo code at BER = 10
^-3
, outperforming its conventional counterpart by about 3.6 dB.