Novel Power-and-Subcarrier Loading Scheme for Improving Spectral Efficiency of Simplified Carrier-Assisted Differential Detection Receivers

In this paper, we propose a novel joint power-and-subcarrier loading scheme to improve the spectral efficiency (SE) for simplified carrier-assisted differential detection (CADD) receivers. Our simulation results show that the required electrical bandwidth of the simplified CADD receiver to achieve the reference bit-error-rate (BER) of 7% hard-decision forward error correction (HD-FEC) limit can be reduced with the help of the proposed joint power-and-subcarrier loading scheme, which increases the SE by 9-25% when the carrier to signal power ratio (CSPR) is 1-7dB as compared to the one with conventional interleaved subcarrier loading scheme. © 2024 Optica Publishing Group