Synchronization scheme using four-dimensional chaotic system for OFDM

As the traditional synchronization algorithm had the shortcoming of the high computational complexity, the low accuracy of the timing synchronization and carrier synchronization and the weak system confidentiality, it presented a kind synchronization scheme using four-dimensional chaotic system for OFDM. Firstly it proved that the system was a new chaotic system through the analysis of the dynamics of four-dimensional system, the sensitivity to the initial value and the calculation for Lyapunov, and analyzed the nature of the chaotic sequence generated by this new system. Then a sub-L training synchronization sequence used the chaotic sequence was constructed, and a novel timing synchronization and frequency-offset estimation scheme was proposed. Theoretical analysis and experiment results demonstrate that the algorithm has low computing complexity, high precision of timing synchronization and carrier synchronization, strong system confidentiality in contrast with the traditional algorithm.