摘要
混沌随机序列发生器在数字实现时面临有限字长效应,无法严格保证伪随机序列的非周期性.构建了一类包含最少模拟器件的新数模混合系统,分析比较了此类系统的非线性动力学行为.利用现场可编程逻辑门阵列和RC电路实现了混沌映射,构造了稳定的高速随机序列发生器,可产生100 Gbit/s以上速率的随机数.研究表明,数模混合系统的混沌性对元件参数变化不敏感,数模实现验证了新系统的存在性和物理上的可实现性.系统易于集成在数字加密、保密通信和雷达波形产生等应用系统中.
Random number generator plays an important role in many domains, including secret communication, radar wave- form generation, etc. However, the existing methods for generating random numbers cannot meet the actual demand for speed. Even worse, the use of analog device will restrict the speed of generator and robustness of system. As a result, researchers start to turn their eyes to digital implementation which is stabler and more efficient than the analog counterpart. Unfortunately, digital methods still have the disadvantages of dynamical degradation because of word length limitation effect. Though some remedies, such as increasing computing precision, cascading multiple chaotic sys- tems, pseudo-randomly perturbing the chaotic system, the switching multiple chaotic systems and error compensation method are proposed, but the limitations are still inevitable. In recent researches, continuous-time chaotic oscillators are used with digital devices to realize random number generator, and a new approach is proposed to solve the dynamical degradation of digital chaotic system by coupling the given digital chaotic map with an analog chaotic system, where the analog chaotic system is applied to anti-control the given digital chaotic map. However, this method also requires a whole continuous-time system realized with analog devices, which confines the system performance. In this paper, a new digital-analog hybrid chaotic map with only one analog capacitor is constructed to produce random numbers. Firstly, the block diagram of digital-analog hybrid system based on the single capacitance feedback is given, and the model of the system is derived from the block diagram. Secondly, the simple logistic map is applied to the model and its nonlinear dynamics behaviors are analyzed and compared to verify the correctness and effectiveness of the proposed method. Then a more complex two-way coupled saw tooth map is used to produce pseudorandom sequences through simulation smoothly. When designing the circuits of the system, a digi
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第16期167-175,共9页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61401204
61401198)
江苏省自然科学基金青年基金(批准号:K2014041565)
中央高校基本科研业务费(批准号:NP2015504)
南京航空航天大学基本科研业务费(批准号:NS2013025)资助的课题~~
关键词
随机序列发生器
有限字长
数模混合
非线性动力学
random number generator, limited word length, digital-analog hybrid, nonlinear dynamics
