2011 International Symposium on Nonlinear Theory and Its Applications
Laser-based Chaos Communication
A. J. Lawrance, C. Chima-Okereke,
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The paper first reports statistical and nonlinear dynamical analysis of a sequence of 10 million paired outputs from two synchronized free-space lasers. The objective is to make an empirical study of such outputs prior to their use as message carrying waves in chaos communication applications. The results obtained from this investigation support the use of synchronized chaotic laser waves in a somewhat modified version of binary antipodal chaos shift-keying (CSK) communication. Instead of studying BER performance by mathematical simulation of chaotic sequences, the more realistic laser waves are used to obtain spreading sequences. CSK theory of BER involving Gaussian assumptions is adapted and comparisons made with empirical results which are not supported by Gaussian assumptions. Differences are not large, except at high spreading, but suggest future enhanced modelling.