Baseband Signal Encryption And SOPC Achieve Based On Chaos Theory

I have been studied a baseband signal encryption based on chaos theory method and used of FPGA logic resources to achieve the base-band signal encryption in this paper.The design of the encryption systems can be divided into three main parts: Central control part, base-band signal encryption part and QPSK modulation output part.NiosⅡsoft-core processor as the control part controled the base-band signal encryption part and QPSK modulation output part. Baseband signal encryption part ranged by the number of parameters of piecewise linear chaotic map to achieve output - cipher text feedback function design. The sensitivity of the initial value, the distribution, and autocorrelation function properties of the range of number of parameters PLCM of base-band signal encryption function were good.The encrypted signal from the QPSK modulation output finally.The basic functions of the system are completed on-chip FPGA and DA conversion by external chips, such as filtering and amplification circuit and so on. The hardware resources to achieve a reconfigurable encryption system have been minimal.