摘要：An evolution on new discipline under nonlinear engineering was considered based on two facts: the first one is based on the higher order effects that takes place and plays more importance in current designs and the second one is focused mainly on non-linear behavior for the new upcoming designs. While considering for the latter one, the complexity of non-linear behavior in random manner is called "chaos", which is now applied for various areas like communications, physiology, signal processing. In this paper, we propose an effective method for improving the security in Orthogonal Frequency Division Multiplexing (OFDM) by the use fractals in the form of chaos.
