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混沌PN序列的DSP实现及其性能分析 被引量:2
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作者 王莹 王光义 《杭州电子科技大学学报(自然科学版)》 2012年第1期1-5,共5页
为了产生性能良好的伪噪声序列,该文提出了一个新的混沌系统。基于该系统和数字信号处理器研究了混沌伪噪声序列的一种产生方法,对获得的序列进行了随机性测试,测试结果及密钥空间、密钥敏感性分析表明,该序列性能良好并能满足信息加密... 为了产生性能良好的伪噪声序列,该文提出了一个新的混沌系统。基于该系统和数字信号处理器研究了混沌伪噪声序列的一种产生方法,对获得的序列进行了随机性测试,测试结果及密钥空间、密钥敏感性分析表明,该序列性能良好并能满足信息加密的需要。 展开更多
关键词 混沌伪噪声序列 数字信号处理器 序列性能分析
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一种新型离散指数混沌映射的实现及其研究 被引量:3
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作者 王伟 彭存建 《现代电子技术》 2014年第1期83-85,89,共4页
针对Logistic映射参数简单、混沌区间范围小的缺点,提出一种新型的离散指数混沌映射。通过引入指数项和增加参数个数,进而扩大映射的混沌区间。利用常规的动力学分析方法,对指数混沌映射进行了动力学特性分析,包括Lyapunov指数图、分岔... 针对Logistic映射参数简单、混沌区间范围小的缺点,提出一种新型的离散指数混沌映射。通过引入指数项和增加参数个数,进而扩大映射的混沌区间。利用常规的动力学分析方法,对指数混沌映射进行了动力学特性分析,包括Lyapunov指数图、分岔图等。在此基础上,对Logistic映射和离散指数混沌映射进行了特性比较。最后对由该离散混沌映射产生的序列进行NIST测试,测试结果表明序列性能更良好。 展开更多
关键词 指数混沌 LOGISTIC映射 动力学特性 序列性能分析
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一种新型指数混沌系统及其DSP数字化实现 被引量:2
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作者 卢军 王光义 《杭州电子科技大学学报(自然科学版)》 2012年第5期1-4,共4页
该文提出了一种基于Chen系统的新型三维指数混沌系统。重点分析了系统参数对整个混沌系统的影响,给出了混沌系统吸引子图,Lyapunov指数图,分叉图等。最后利用DSP实现了该混沌系统,并对由系统生成的数字序列做了NIST测试,测试结果表明序... 该文提出了一种基于Chen系统的新型三维指数混沌系统。重点分析了系统参数对整个混沌系统的影响,给出了混沌系统吸引子图,Lyapunov指数图,分叉图等。最后利用DSP实现了该混沌系统,并对由系统生成的数字序列做了NIST测试,测试结果表明序列性能良好。 展开更多
关键词 理论分析 李雅普诺夫指数 数字信号处理 序列性能分析
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Time-Ordered Collaborative Filtering for News Recommendation 被引量:6
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作者 XIAO Yingyuan AI Pengqiang +2 位作者 Ching-Hsien Hsu WANG Hongya JIAO Xu 《China Communications》 SCIE CSCD 2015年第12期53-62,共10页
Faced with hundreds of thousands of news articles in the news websites,it is difficult for users to find the news articles they are interested in.Therefore,various news recommender systems were built.In the news recom... Faced with hundreds of thousands of news articles in the news websites,it is difficult for users to find the news articles they are interested in.Therefore,various news recommender systems were built.In the news recommendation,these news articles read by a user is typically in the form of a time sequence.However,traditional news recommendation algorithms rarely consider the time sequence characteristic of user browsing behaviors.Therefore,the performance of traditional news recommendation algorithms is not good enough in predicting the next news article which a user will read.To solve this problem,this paper proposes a time-ordered collaborative filtering recommendation algorithm(TOCF),which takes the time sequence characteristic of user behaviors into account.Besides,a new method to compute the similarity among different users,named time-dependent similarity,is proposed.To demonstrate the efficiency of our solution,extensive experiments are conducted along with detailed performance analysis. 展开更多
关键词 similarity collaborative compute recommendation filtering users hundreds Collaborative Recommendation interested
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Despreader for Direct Sequence Spread Spectrum System and Its Performance Analysis
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作者 何先灯 裴昌幸 易运晖 《Transactions of Tianjin University》 EI CAS 2010年第4期275-278,共4页
A new type of despreader for direct sequence spread spectrum signal is proposed. Compared with traditional despreaders, the new despreader does not contain hard decision ware or handle binary sequence any more, and th... A new type of despreader for direct sequence spread spectrum signal is proposed. Compared with traditional despreaders, the new despreader does not contain hard decision ware or handle binary sequence any more, and the locally stored spread spectrum signals are pre-modulated baseband signals (such as Gaussian minimum shift keying (GMSK) signals), which are much more similar to the received spread spectrum signals. Moreover, the missed detection probability of the despreader is about one order of magnitude lower than that of traditional ones. Based on the maximum likelihood criterion and phase probability density function of demodulated signal, a new method of ana- lyzing the despreaders’ performance is put forward, which is proved to be more accurate than traditional methods according to the numerical results. Finally, an adaptive despreader under different signal-to-noise ratios is given. 展开更多
关键词 spread spectrum communication matched filter digital matched filter PROBABILITY
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