Integrate and Dump Infrared Receiver for Four-Slot Pulse Position Modulation Decoding
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
This article describes a circuit arrangement for a correlation detector which can be used for pulse position modulation (PPM) and is known as an "integrate and dump" receiver. It is known in the industry that a matched filter receiver is the optimum receiver for any given signal. A matched filter is one which has an impulse response which is the same as the signal waveform shape in the time domain. For example, a matched filter for a rectangular pulse is one that has a transfer function h(T) such that when an impulse function is convolved with h(T), the result is a rectangular pulse. A special case of a matched filter receiver for binary data is called a correlation detector. This is one where the ideal symbols for a "0" and a "1" are known and available in the detector.