Abstract. In this paper
new and existing approaches are developed to data transfer for chaos-based
communication systems. Chaotic communication has many advantages over
traditional communication for its broadband, noise like characteristics. In the
traditional communication based on Chaos Shift Keying, synchronization needs to
be established between the transmitter and receiver of the system. Due to the
extreme sensitivity of initial value of chaotic signal, it is very difficult to
achieve synchronization. So this method is difficult to be applied practically.
To solve this problem, an Orthochaotic Data Transfer system was proposed, in
which chaos synchronization is not necessary. The chaotic signal is divided
into pulses of a given duration. When transmitting the current pulse following
the previous one is exposed orthogonalization or collinearization depending on
transmitted data. On the receiver side the scalar product of the current
received pulse and the previous received pulse is calculated and the decision is
performed about transfer of one of the three numbers. Synchronization of the
receiver and the transmitter are done on the basis of changes in sign of the
mutual energy of the neighboring chaotic impulses. The new system was deeply
studied and was compared with the Binary Phase Shift Keying modulation. The
efficient of the proposed approach is illustrated with plots of dependences of bit-error
rate on signal to noise ratio. It can be clearly seen that the Orthochaotic
Data Transfer is realizable in digital secure communication.
Keywords: broadband pseudo
noise signal, chaotic signal, chaos synchronization, orthogonalization and
collinearization of chaotic pulses, correlation receiving, chaotic digital
secure communication.
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