A New Coding Scheme for Infrared ASK Communication Systems Which Have Zero-Spectrum Points within the Main-Lobe Region

Makoto NAKAMURA  Yoshihiro OHTANI  Yutaka IKEDA  Hiroshi UNO  Akihiro FUJII  Yoshiaki NEMOTO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E82-B   No.8   pp.1169-1179
Publication Date: 1999/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: Optical Systems and Technologies
Keyword: 
infrared,  ASK,  spectrum,  coding,  PSM,  co-existence,  

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Summary: 
In the present paper, a new coding scheme for infrared ASK communication systems--Pulse Sequence Modulation (PSM)--will be proposed, which uses a combination of pulse sequences so that it canattain zero-spectrum points at specific frequencies within the main-lobe region. The interference to the other IR systems was a problem of the conventional infrared ASK communication systems. The proposed PSM coding scheme reduces the interference by decreasing the emission at specific frequencies, and helps multiple IR communication systems co-exist without deteriorating coding efficiency.