Research on the optimised transceiver impedances for low‐voltage broadband PLC system

Abstract

The design of transceiver impedances is very important to improve the performance of the power line communication (PLC) system. In this study, it infers an expression of signal-to-noise ratio (SNR) related to transceiver impedances for broadband PLCs, and the optimal transceiver impedances are obtained by solving a maximisation problem. By the comparison of the SNR of PLC system with the proposed transceiver impedances and only optimised transmitter or receiver impedance, the conclusions are derived that the PLC system performance with the proposed transceiver impedances is better and the receiver impedance has a greater influence on the performance of the PLC system. To verify the advantage of the optimal transceiver impedances proposed in this study, the authors also make the comparison with the other two kinds of transceiver impedance optimisation methods by simulating SNR and transmission rate of the PLC system. The results show that in theory, the SNR and channel capacity of PLC system ca, maximally increase by 15 dB and 50 Mbits/s, respectively, using the proposed transceiver impedances by comparing with the other two impedance optimisation methods, which proves that the proposed transceiver impedances in this study can obtain the better performance of the PLC system.