Wakeup receiver

A method, comprising:

• monitoring, at a wakeup receiver an input signal of a communication channel, wherein the input signal comprises a plurality of packets, each packet comprising a respective packet length;
• down-converting the input signal to a DC signal;
• digitizing the DC signal with an analog to digital converter (ADC) to provide an ADC output;
• applying, with a digital baseband (DBB) module, an automatic gain control (AGC) loop to the ADC output to provide a gain-controlled signal;
• determining a received signal strength indication (RSSI) based on the gain-controlled signal;
• for each packet, determining the respective packet length;
• comparing the RSSI and respective packet length with a two-dimensional template;
• based on the comparison, determining an interrupt condition;
• and
• based on determining the interrupt condition, generating a wakeup signal.

A digital baseband (DBB) module, comprising:

• an automatic gain control (AGC) loop and a processor,
• wherein the processor of the DBB module is executable to:
• apply the AGC loop to an output of an analog to digital converter (ADC) to provide a gain-controlled signal,
• determine a received signal strength indication (RSSI) based on the gain-controlled signal,
• for each of a plurality of packets, determine a respective packet length,
• compare the RSSI and the respective packet length with a two-dimensional template,
• based on the comparison, determine an interrupt condition, and
• based on determining the interrupt condition, generate a wakeup signal.

A method, comprising:

• applying, with a digital baseband (DBB) module, an automatic gain control (AGC) loop to an output of an analog to digital converter (ADC) to provide a gain-controlled signal;
• determining a received signal strength indication (RSSI) based on the gain-controlled signal;
• for each of a plurality of packets, determining a respective packet length;
• comparing the RSSI and the respective packet length with a two-dimensional template;
• based on the comparison, determining an interrupt condition;
• and
• based on determining the interrupt condition, generating a wakeup signal.