Communication system and method of data communications

A communication system, comprising:

• a transmitter configured to transmit a modulated signal, the transmitter comprising:
• a modulator configured to receive a data signal, and to generate the modulated signal responsive to the data signal and a carrier signal;
• a transmission line configured to carry the modulated signal;
• and
• a receiver configured to receive the modulated signal, and being coupled to the transmitter by the transmission line, the receiver comprising:
• a demodulator configured to demodulate the modulated signal responsive to a first carrier signal, the demodulator comprising:
• a mixer configured to generate a first signal based on the first carrier signal and the modulated signal;
• a filter coupled to the mixer, and configured to generate a filtered first signal based on the first signal, the filter having a gain controlled by a set of control signals;
• and
• a gain adjusting circuit coupled to the filter, and configured to adjust the gain of the filter, and to generate the set of control signals based on a voltage of the filtered first signal and a voltage of the first signal, the gain adjusting circuit comprising:
• a first peak detector coupled to the filter, and configured to detect a peak value of the voltage of the filtered first signal.

A method of data communications, comprising:

• demodulating a modulated signal responsive to a first carrier signal, thereby generating a demodulated data stream, wherein demodulating the modulated signal comprises:
• generating a first signal in response to mixing the first carrier signal and the modulated signal;
• generating, by a filter, a filtered first signal based on the first signal;
• generating a set of control signals based on a voltage of the filtered first signal and a voltage of the first signal, wherein generating the set of control signals comprises:
• detecting a peak value of the voltage of the filtered first signal;
• and
• adjusting a gain of the filter based on the set of control signals.