The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
Laser Review
Chaotic Features of Almost Periodic Frequency Arrangement (APFA)
Isao NAKAZAWAKen UMENO
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2020 Volume 48 Issue 5 Pages 233-

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Abstract
Based on the expansion in the capacity of communication networks to connect not only persons but also machine-to-machine systems, we propose an almost periodic frequency arrangement (APFA) constructed with disjoint sets of irrational number groups created using the power root of a prime number. In this paper, we explain the research process of spreading codes using chaotic codes, and the chaotic features of APFA that are derived from the approximate periodic frequency function using a new frame Lyapunov exponent, which estimates the phase difference sensitivity depending on the frame number. The findings of this study indicate that it is possible to connect more than one million channels at a base station using the super-multicarrier APFA systems with the same communication quality characteristics as current systems.
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© 2020 by The Laser Society of Japan
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