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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
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Munoz-Bustamante, C: AUTHOR [+3]

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.

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

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. When this prior art was developed [*], data was encoded so as to provide the positioning of one pulse within a field of sixteen allow

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able sequential time slots, thereby encoding four bits of information, as shown in Fig. 1. In this form of encoding, each pulse serves as the end marker for the current encode and start pulse for the next encode. Therefore, to encode the nibble Å0000', two time slots were required. On the average, eight time slots were required for typical encoding operations. Since infrared transmission switching speeds typically require that each time slot be greate...