Nonlinear Quantization for Power-Domain Non-Orthogonal Multiple Access Passive Optical Network

A passive optical network (PON) system is required to accommodate multi-services represented by fifth/sixth (5G/6G) mobile communication systems. While maintaining low cost, meet these requirements (which are high capacity, latency, and reliability), the PON must a large number of units (ONUs). The use power-domain non-orthogonal multiple access (PD-NOMA) for has been studied increase accommodatable ONUs. However, with an in ratio transmitted power between multiplexed ONUs, effect quantization noise analog-to-digital converter (ADC) more significant. This study proposes apply optimal quantizer based on Lloyd-Max algorithm nonlinear algorithm) PD-NOMA-PON. In general, requires continuous probability density function when setting partitions. We adopt estimated from discrete distribution extracted low-resolution ADC using expectation maximization algorithm. conduct experiments verify feasibility proposed downlink confirm improvement signal-to-noise penalty all ratios.