How to mitigate interference from carrier signal attenuation in a concentrator?

Power line carrier signals attenuate during transmission, and this attenuation increases with frequency and distance, making them susceptible to noise. Improving immunity requires addressing the transmission, reception, and signal processing stages. At the transmitter, forward error correction (FEC) coding and interleaving techniques enhance the signal's resistance to sudden interference. Appropriately increasing transmit power (in compliance with regulations) is also crucial. At the receiver, a high-sensitivity carrier chip is used, and a low-noise amplifier (LNA) is pre-amplified. Automatic gain control (AGC) circuitry is incorporated into the carrier receiving channel to dynamically adjust the gain to handle signal fluctuations. Digital signal processing (DSP) techniques are employed for adaptive filtering and noise cancellation. In the coupling circuit, the matching network is optimized to reduce insertion loss. Through these comprehensive measures, the carrier receiver can still demodulate correctly even with a signal attenuation of 60dB and a signal-to-noise ratio below 0dB, extending the communication distance by 20%.