METHODS AND APPARATUS FOR MULTIPHASE SAMPLING OF MODULATED LIGHT

摘要

A light transmitter to transmit multiple light packets, each formatted to include a same message comprising a series of bits, each bit represented as light that is intensity modulated over a bit period at a frequency indicative of the bit. The light packets are transmitted at different start-times to establish different phases, one for each of the light packets, to permit a light receiver to sample each message at a different phase of a fixed sample timeline that is asynchronous to the bit period and the frequency. The light receiver samples the multiple light packets based on the sample timeline, to sample each received message at one of the different sample phases, then constructs a best series of bits based on the multiple demodulated messages.

主权项

1. A method, comprising:
encoding an identical message in each of first and second light packets, including, for each light packet, cycling a light intensity at one of first and second frequencies for each bit of a message based on a value of the respective bit; and transmitting the first and second light packets, including transmitting the second light packet with a phase difference relative to the first light packet.