Patent ID: 11025342

Abstract:
A method includes receiving X pilot symbols, determining light source sequence numbers of the X light sources based on the X pilot symbols, receiving M×X undersampled pulse width modulation-based pulse position modulation (UPPM) symbols and parsing the M×X UPPM symbols thereby obtaining original data from a sending node by using N light sources. Each of the X pilot symbols includes W waveform segments. Each of the W waveform segments includes a first light source sequence number indication part that indicates a light source sequence number. Waveforms of waveform segments with odd sequence numbers in the W waveform segments are the same, waveforms of waveform segments with even sequence numbers in the W waveform segments are the same, and a duration of each of the W waveform segments is equal. The X pilot symbols are in a one-to-one correspondence with X light sources.