Pulse detection based on correlation of derivative data

A method, comprising:

• using one or more light sources to transmit at least a first light pulse encoding and a second light pulse encoding;
• using one or more detectors to detect a received light signal;
• determining a derivative data of the detected received light signal including by computing a derivative based on the detected received light signal;
• correlating the derivative data with at least a first reference data corresponding to the first light pulse encoding and a second reference data corresponding to the second light pulse encoding to determine a correlation result;
• and
• using the correlation result to identify which transmitted light pulse encoding corresponds to the received light signal.

A computer program product embodied in a non-transitory computer readable medium and comprising computer instructions for:

• causing one or more light sources to transmit at least a first light pulse encoding and a second light pulse encoding;
• causing one or more detectors to detect a received light signal;
• determining a derivative data of the detected received light signal including by computing a derivative based on the detected received light signal;
• correlating the derivative data with at least a first reference data corresponding to the first light pulse encoding and a second reference data corresponding to the second light pulse encoding to determine a correlation result;
• and
• using the correlation result to identify which transmitted light pulse encoding corresponds to the received light signal.