Abstract: Generally, coherent or noncoherent method can be applied to chaso-based digital communication for digital informationdetection. In this paper, a kind of noncoherent detection technology for chaotic signal based on probabilistic method is presented. The method consists of maximum-likelihood and Bayesian formulation. Nonconherent detection is realized by the reconstruction of chaotic signal at CSK receiver. Firstly, the transmitter undergoes bifurcation-parameter modulation according to transmitted digit. Due to the chaotic si gnals sensitivity to parameter, the received chaotic signals with different bifurcation parameter is different. Corresponding to the different calculated probabilities, the transmitted digital signal can be decode correctly. The simulation results using Matlab agrees well with the presented theory.

Key words: noncoherent detection, chaotic signal, maximum-likelihood, Bayesian formulation