Synthesis and simulation of digital demodulator for infrared data communication

Abstract

A high performance design methodology is described for a digital demodulator, which is intended for the noise immune wireless infrared data communication. In this methodology, ASK (Amplitude Shift Keying) infrared signals detected by a photo detector are digitized into two logic-level pulses by an infrared receiver, and the demodulation of the digitized signals is implemented by a new architecture. On account of the interference with optical noises from fluorescent lamps, an ASK receiver is realized by a 1-bit digital demodulator, which is designed with use of a high level synthesis tool COMPASS so as to implement an algorithm for removing the noises. A part of experimental results is also shown to demonstrate the practicability.