Methods and arrangements for generating a waveform for frequency shift keying communications

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 waveform in the form of chips at a chipping clock frequency that switch a light source between on and off states to communicate via light sources that can be amplitude modulated such as LED lighting. Some embodiments may provide a method of transmitting the waveform via modulated LED lighting. 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 of generating a waveform for frequency shift keying data via a light source, the method comprising:
processing the data to determine chips indicative of the waveform, wherein processing the data comprises selecting chips indicative of the bits of the data, wherein the chips are indicative of on and off states of the light source, the processing comprising:
generating a start frame delimiter, the start frame delimiter comprising chips to establish a delimiter frequency;generating chips to establish a space frequency for each logic zero in the data; andgenerating chips to establish a mark frequency for each logic one in the data;wherein the direct current (DC) average value of the waveform is zero; and outputting the chips to establish the delimiter frequency, space frequency, and mark frequency in memory in a sequence indicative of the data.