Fig. 5
From: Improved demapping for channels with data-dependent noise
Maximum rate. Maximum achievable rate for different demappers for the nonlinear channel in scenario 1. The achievable rate for the proposed covariance-based demapper (solid line) and standard demapper (dashed line) is compared to the theoretical limit obtained from the symbol-level channel model (dots). Rates are plotted for 64-APSK and 128-APSK modulation schemes for an input power of -3 dB relative to amplifier saturation