基于四维混沌系统的OFDM同步算法

针对传统同步算法计算复杂度高,符号同步和载波同步精度低,保密性差等缺点,提出一种基于四维混沌系统的OFDM同步算法.首先通过分析该四维系统的动力学特性、对初始值的敏感性和计算Lyapunov指数等方式,证明该系统是一个新混沌系统,并分析生成的混沌序列相关性质.然后将混沌序列用于构造一个L等分的同步训练序列,基于该同步训练序列提出一种新的OFDM系统符号同步和载波同步方法.理论分析和仿真结果表明新算法计算复杂度低,符号同步和载波同步精度高,增强了系统保密性.

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 cartier 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.