CAJ | 학술논문

混沌序列因其码组丰富、抗截获能力强等优点，常作为扩频码。单一混沌映射在平衡特性和随机性等方面存在不足，因而提出了一种新的混合混沌序列。将改进型Logistic映射与Chebyshev映射结合起来组成双混沌系统，在分析这种双混沌序列的相关性能的基础上，将其应用于直接序列扩频系统中。仿真结果表明，新的混合混沌序列具有更好的伪随机特性，能改善系统性能，可代替单一的混沌序列作为扩频码。
혼돈서렬인기마조봉부、항절획능력강등우점，상작위확빈마。단일혼돈영사재평형특성화수궤성등방면존재불족，인이제출료일충신적혼합혼돈서렬。장개진형Logistic영사여Chebyshev영사결합기래조성쌍혼돈계통，재분석저충쌍혼돈서렬적상관성능적기출상，장기응용우직접서렬확빈계통중。방진결과표명，신적혼합혼돈서렬구유경호적위수궤특성，능개선계통성능，가대체단일적혼돈서렬작위확빈마。
Because of its rich sequence and good anti-interception capability , chaotic sequence can be used as spreading code .Single chaotic map has disadvantage in the aspects of balance and randomness .To solve this problem , a new hybrid chaotic sequence is proposed .The dual chaotic system is consisted of two chaotic systems which are the improved Logistic map and Chebyshev map .Based on the analysis of relevant properties of this dual chaotic sequence , this sequence will be applied to the direct sequence spread spectrum system .The simulation results show that the new hybrid chaotic sequence , which can be used as spreading code instead of a single chaotic sequence , has better characteristics of pseudo-random and can greatly improve system performance .