Study on Chaotic Sequences for Spread Spectrum Communication Based on Nonlinear Digital Filters

Chaotic pseudo-noise (PN) sequences for spread spectrum (SS) communications ranks amongst the most promising applications of chaos to communications. Of special interest is the use of chaotic sequences for frequency-hopping and direct-sequences spread spectrum communications. In this paper, a chaos-based sequence generator with the multidimensional chaotic system is designed. Some modifications are introduced to the n-dimensional nonlinear digital filters in order to improve the period and distribution property of the resulted sequence. The property of chaotic sequences that are generated is similar to that of pseudo-noise sequence. Test results show that the property of chaotic sequences that are generated by the proposed generator is accordant with those in theory