Indirect reflection detection for receiver circuitry protection in TDD transceivers

A communications device, comprising:

• a transmit signal path;
• a receive signal path;
• an isolation device coupled to the transmit signal path and the receive signal path, wherein the isolation device is configured to provide an analog transmit signal from the transmit signal path to an antenna port of the isolation device, wherein the isolation device is configured to provide an analog receive signal from the antenna port to the receive signal path;
• a coupler coupled to the receive signal path between the isolation device and an amplifier of the receive signal path;
• a power detector coupled to the coupler and configured to measure a power level of a transmit leakage signal in the receive signal path;
• and
• a comparator configured to compare the measured power level of the transmit leakage signal to a first threshold value and output a first alarm signal indicating that the measured power level of the transmit leakage signal exceeds the first threshold value;
• wherein the communications device is configured to reduce a transmit output power in response to the first alarm signal.