Abstract
In a Differential Chaos Shift Keying (DCSK) system, the reference and information chaotic bearing signals are transmitted in two consecutive time slots. This design requires twice the bit duration....
Highlights
The basic idea of digital communication system using chaotic carrier is that the information bits are mapped to a sample function of chaotic signal from one or more chaotic attractors
With chaotic synchronization, a local synchronized copy of each sample function has to be produced at the receiver
This is due to variable energy value at each bit which clearly shows the limitation of the Gaussian-approximation method
Summary
The basic idea of digital communication system using chaotic carrier is that the information bits are mapped to a sample function of chaotic signal from one or more chaotic attractors. Bits are mapped to actual non-periodic output of chaotic circuits and not to parameters of certain sample functions. The major difference between a chaotic carrier and conventional carrier is that the sample function for a given symbol is non-periodic and different from one bit to another (Kolumban, Kennedy, & Chua, 1997). The received signal is corrupted by noise which makes repeating of the exact copy a challenging task due to non-periodicity properties (Kolumban, Kennedy, & Chua, 1998). Obtaining an optimum threshold to distinguish between signal sets does not depend only on signal power at the correlator output, and on the noise power estimation which is the major drawback of non-coherent systems (Lau & Tse, 2003)
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