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Statistical Ordering of Bit Positions in Pulse Position Modulated Code for Infrared Data Transmission Throughput Optimization

IP.com Disclosure Number: IPCOM000038498D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31

Publishing Venue

IBM

Related People

Authors:
Munoz-Bustamante, C Dixon, JD Zalph, WN [+details]

Abstract

A technique is described whereby the transmission of data, utilizing infrared technology, is statistically optimized so as to obtain the maximum throughput rate, thereby providing communications capability with devices requiring throughput rates on the order of 1.5 Mbit/sec. Infrared data transmission has been considered practical, when data encoding/decoding techniques are utilized, which can tolerate duty cycle distortions and provide timing information. So as to provide the best distance and bit-error-rate characteristics, a pulse position modulation type of code was developed whereby data is encoded into the position of a pulses within a field of allowable "time slots". The technique was called time division pulse modulation (TDPM) encoding.