Pulse-matched filter-based packet detection apparatus and method

A packet detection method comprising:

• converting an optical wireless communication signal into an electrical signal;
• converting the electrical signal into a digital signal;
• demodulating the digital signal based on a packet detection signal;
• executing, by at least one digital signal processor, instructions stored in a memory to obtain a first correlation representing a correlation between a pulse obtained by oversampling a modulated pulse and the digital signal;
• executing, by the at least one digital signal processor, instructions stored in the memory to obtain a second correlation representing a correlation between the first correlation and a preamble code stored in the memory;
• and
• executing, by the at least one digital signal processor, instructions stored in the memory to generate the packet detection signal by comparing the second correlation and a packet detection threshold value,
• wherein the optical wireless communication signal is modulated by an on-off keying (OOK) method, and
• the modulated pulse is an OOK modulated pulse.

An optical wireless communication device comprising:

• a light receiving module receiving an optical signal;
• and
• a packet detection apparatus detecting an optical wireless communication signal among the received optical signals,
• wherein the packet detection apparatus comprises:
• a photoelectric converter converting the optical wireless communication signal into an electrical signal;
• an analog-to-digital converter (ADC) converting the electrical signal into a digital signal;
• a demodulator configured to demodulate the digital signal based on a packet detection signal;
• and
• at least one digital signal processor and memory including instructions that, when executed by the at least one digital signal processor, implement:
• a pulse-matched filter generating and outputting a first correlation representing a correlation between a pulse obtained by oversampling a modulated pulse and the digital signal, the at least one digital signal processor performing the oversampling;
• a correlator generating and outputting a second correlation representing a correlation between the first correlation and a preamble code stored in the memory;
• and
• a packet detection signal generator generating and outputting the packet detection signal by comparing the second correlation and a packet detection threshold value,
• wherein the optical wireless communication signal is modulated by an on-off keying (OOK) method, and
• wherein the modulated pulse is used in the on-off keying (OOK) modulation method.