A jms - based data synchronization method between heterogeneous databases under distributed network environment is provided . the key technologies involved in the process of implementing the method are discussed in detail 摘要针对分布式网络环境下异构数据库间数据同步的问题,提出了一种基于jms的数据同步方法,并对该方法实现过程中涉及到的关键技术进行了研究。
Associated with the research project , the author has done some research on the synchronization issues in utran and the synchronization methods used in ip networks to transport circuit emulation services ( ces ) 本文结合科研项目的需要,对第三代移动通信系统陆地无线接入网( utran )中的各种同步问题以及全ip网络中传送电路仿真业务的同步方法进行了比较深入的研究。
( 2 ) a new synchronization method based on barker code is designed which is simple , effective for uwb system . ( 3 ) a new channel estimation method based on music algorithm is given , which is compared with ml algorthim . and the effection is proved by ( 3 )采用数学公式推导出基于music算法的信道估计的理论公式,得出了仿真结果,将其与较为成熟的ml算法比较,并在实测数据中加以验证。
This thesis researched the time synchronization method for 2d - ss system , and deeply discussed the bit error rate ( ber ) performance of multicarrier domain spread spectrum chip - level differential detection ( mc - ss - cldd ) in the presence of multi - user interference 本论文从多载波扩频通信系统出发,提出了广义二维扩频系统的同步算法,并对多载波频域扩频码片级差分检测技术在多用户情况下的系统性能进行了深入的研究。
The method can be used in the measurement of periodic and nonperiodic signal . according to the high accuracy and fixed gate - time measurement method , based on the multiple period synchronization method , the high speed , high accuracy and continuous frequency measurement is accomplished 将其再与一种从多周期同步法发展而来的高精度、定闸门法相结合,从而实现了高速、高精度、连续频率测量,这非常适合非频率量的频率传感信号的测量。
A modified synchronization approach by using sliding windows is proposed . the pre - processing for obtaining principal eigenvectors is a smoothing procedure for the dsss signal . the computer simulations show that the approach is more convenience in low snr comparing with other code synchronization methods 3 、提出了一种改进滑动窗的盲同步方法,该方法利用求主特征向量的过程,对扩频信号进行平滑降噪预处理,实现了较低信噪比下的码同步。
Then the proposed method is applied to the uplink of the multiuser ofdm ( ofdma ) . two synchronization methods based on cyclostationarity are proposed here for two different subcarrier allocation modes . the simulation results demonstrate the good performances of the proposed estimators 针对多用户ofdm系统中载波分配方式的不同,对两种分配方式分别提出了基于ofdm信号循环平稳特性的同步估计算法,通过仿真看出算法具有良好的估计性能。
This paper researches deeply and compared about some kind of chaos synchronization methods by systematical analysis and numerical simulation method , which include pecora - carroll synchronization method , feedback synchronization method , couple synchronization method and self - adapt synchronization method 文章重点通过系统分析和数值模拟方法对实现混沌同步的各种方法进行了深入研究,包括pecora - carroll同步,反馈同步,耦合同步,自适应同步。
In the second part , the synchronization prosperity of several chaotic secure communication methods are discussed and compared , from which we think the active - passive synchronization method is the best one for building chaotic synchronization secure communication system 接着讨论混沌同步保密通信实用化存在的关键问题,对几种混沌同步保密通信方案的同步特性作了研究比较,指出主动?被动同步方案保密通信最适合用来建立混沌同步保密通信系统。
Moreover two types of non - cooperative sequences estimation and despreading schemes are introduced briefly . 2 . several usual blind code synchronization methods , including delay multiply ( sliding autocorrelation ) , maximum norm and average noise reduction approaches are summed up and analyzed by computer simulations 2 、总结和介绍了几种常用的盲码同步方法,包括延迟相乘(滑动自相关)法、最大范数法、平均降噪法等,并进行了计算机仿真和分析。