CAJ | 학술논문

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.
침대전통동보산법계산복잡도고,부호동보화재파동보정도저,보밀성차등결점,제출일충기우사유혼돈계통적OFDM동보산법.수선통과분석해사유계통적동역학특성、대초시치적민감성화계산Lyapunov지수등방식,증명해계통시일개신혼돈계통,병분석생성적혼돈서렬상관성질.연후장혼돈서렬용우구조일개L등분적동보훈련서렬,기우해동보훈련서렬제출일충신적OFDM계통부호동보화재파동보방법.이론분석화방진결과표명신산법계산복잡도저,부호동보화재파동보정도고,증강료계통보밀성.
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.