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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
IEICE TRANSACTIONS on Communications
Publication Date: 1999/08/25
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
infrared, ASK, spectrum, coding, PSM, co-existence,
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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.