METHODS AND ARRANGEMENTS FOR FREQUENCY SHIFT COMMUNICATIONS BY UNDERSAMPLING

摘要

Embodiments may provide a way of communicating via an electromagnetic radiator, or light source, that can be amplitude modulated such as light emitting diode (LED) lighting and receivers or detectors that can determine data from light received from the amplitude modulated electromagnetic radiator. Some embodiments may provide a method of transmitting/encoding data via modulated LED lighting and other embodiments may provide receiving/decoding data from the modulated LED lighting by means of a device with a low sampling frequency such as a relatively inexpensive camera (as might be found in a smart phone). Some embodiments are intended for indoor navigation via photogrammetry (i.e., image processing) using self-identifying LED light anchors. In many embodiments, the data signal may be communicated via the light source at amplitude modulating frequencies such that the resulting flicker is not perceivable to the human eye.

主权项

1. A method comprising:
generating, by a frequency shift keying modulator, an output signal at a delimiter frequency, the delimiter frequency being between a first frequency and a second frequency, wherein the output signal at the delimiter frequency can facilitate demodulation of data to transmit, the data having bits associated with a first group and a second group, wherein the first group is associated with the first frequency and the second group is associated with the second frequency; generating, by the frequency shift keying modulator, the output signal at the first frequency to transmit bits associated with the first group; generating, by the frequency shift keying modulator, the output signal at the second frequency to transmit bits associated with the second group; and applying, by the frequency shift keying modulator, the output signal to a light source to generate light comprising the data.