sess造句

• Compare of the difference between stateful session bean and stateless sess ion bean
  对有状态和会话bean和无状态的会话bean进行了比较和分别论述。
• That improves the security performance of the conventional sess system and enhances the performance of anti - jamming
  Pn序列的这一特点使通信的安全性受到威胁。
• Therefore , fast and reliable synchronization algorithm is one of key technologies in sess system
  因此,迅速、可靠地建立同步是自编码扩频通信最主要的环节之一。
• According to the accounting equation , a firm is assumed to pos ? sess its assets subject to the rights of the creditors and owners
  根据会计等式，一个公司所拥有的资产应该等于债权人和所有者对企业的索取权总值。
• In sess , the special way producing the spreading codes determines that the spreading codes are more important in sess communication system
  在自编码扩频通信中,特殊的扩频序列产生方式决定了自编码扩频序列对于整个系统性能的影响更是巨大的。
• Some novel technologies are also proposed , such as two dimensional spread spectrum ( 2d - ss ) , self - encoded spread spectrum ( sess ) , multiple input multiple output ( mimo ) , orthogonal frequency division multiplexing ( ofdm ) and so on
  另外,对目前新兴的一些抗干扰技术,如二维扩频、超宽带、多天线、自编码扩频等技术也做了简单分析。
• The data recovery at the receiver requires the spreading codes . in sess system , the receiver doesn ’ t know which spreading code will be used , so first it must de - spread the received signal correctly to regenerate the spreading code
  自编码扩频系统的扩频序列是接收端事先未知的,不能用事先设计的本地扩频序列产生器产生,需要由恢复的数据获得。
• Based on the principles of dsss and sess , the mechanism of sess employing the ar filter is illuminated . it transfers the data source to dynamic gauss white noise . then quantizing and optimizing the noise , we can get the final spread sequence
  它动态地把信源序列转化成高斯白噪声分布的数据流,再通过量化、平衡编码进行序列优化,以得到所需的扩频码。
• The spreading code is acquired from the transmission data source . as a result , the method to generate the spread codes is very important . and the method determines the practical application of sess communication system
  自编码扩频通信的扩频序列是从待传输的信源数据流中获得的,因此信源的随机化技术是自编码扩频通信的基础,它在很大程度上决定了自编码扩频通信是否能获得实际应用。
• Shanghai zhengcai metalwork ltd . was found at 2001 , we pre - ferical produce all kinds of carport , bike shed , export hardw - are and foreign trade . the company pos - sess of seasoned te - chnical personnels andworkers
  上海正彩金属制品有限公司成立于2001年，是一家生产各式停车棚、停车架、出口金属制品及贸易多元化为一体的专业公司。公司拥有优秀的开发设计员，经验丰富、技术过硬的生产队伍和完善的生产设备。
• At 1999 , lim nguyen first brought forward a novel self - encoded spread spectrum ( sess ) system , which spread spectrum sequence is full builded by the source data . in sess system , which does not use pn codes . it employs random spreading sequences that are extracted from the information data
  自编码直扩通信是limnguyen在1999年首次提出的一种利用信源数据产生扩频序列的随机直扩技术,它产生具有随机的、动态可变的扩频序列,因而是一种较好的安全通信方式。
• Traditional spread spectrum communication adopts pseudo - noise ( pn ) codes as spreading codes . however , pn sequence is fixed and periodic , which threatens the transmission security . self - encoded spread spectrum ( sess ) employs random spreading sequences that are extracted from the random information data , abandoning the fixed sequence
  传统的扩频通信广泛采用伪噪声( pseudo - noise , pn )序列作为扩频序列, pn序列具有类噪声特性,但它实际上是确定的周期序列,容易被复制。
• Appropriate data compression methods are needed to assure the random nature of the information source and to enlarge its entropy . in this thesis , first , we present the theory of sess system , then the acquisition method of sess system is discussed in detail , finally , a acquisition model of sess system is built and simulated in the awgn channel , in the raleigh fading channel and in multi - address interfere condition . the simulation results show the acquisition method of sess system can be just as reliable as the conventional dsss systems
  本文首先对自编码扩频通信的基本原理,自编码扩频序列的产生方法及其产生的序列的特性进行了概述,然后详细讨论了直扩通信系统中的扩频码的捕获跟踪问题,根据自编码扩频通信的特点,设计了其捕获跟踪方案,并在加性高斯白噪声信道、瑞利衰落信道和多址干扰情况下进行了仿真。
• In this thesis , we present a novel spread spectrum communication system , self - encoded spread spectrum ( sess ) system , which does not use pn codes , and is unique in that traditional transmit and receive code generators based on maximal - length sequences or chaotic signals are not needed . then the spreading codes are stochastic and variable
  自编码扩频通信是一种较佳的安全通信方式,它利用传输的数据信息产生扩频码,避免了使用m序列、混沌序列等伪随机序列发生器,保证了扩频序列的随机性、动态可变性和信号的低截获率。
• In order to practice the sess communication system based on ar filter , the system must have the good performance of anti - jamming and multiple accessing . we analyze and simulate the ar - sess communication model , the important performance factors , the bit error ratio ( ber ) performance and the multiple accessing
  本文以ar自编码直接序列扩频通信方式为对象,讨论基于ar的自编码扩频通信系统( ar - sess )模型、影响ar - sess系统性能的重要因素、 ar - sess通信的信噪比和多址通信能力。
• In this thesis , first , we present the theory of sess system , the generation of the sess spreading code and its characteristics and the acquisition theory of conventional spread spectrum communication system . an efficient acquisition scheme based on periodically transmitting the synchronization head , which is composed of binary chaotic codes , using the matched filter and automatic decision threshold - level control based on a so - called constant false alarm criterion for sess system is present . the acquisition model of sess system is built and simulated in the awgn channel , the raleigh fading channel and imulti - address interfere condition
  本文首先概述了自编码扩频通信的原理、自编码扩频序列的产生方法及其特性和扩频通信系统编码同步的理论,然后针对自编码扩频通信系统提出了扩频序列捕获方案:周期性地加入混沌序列同步码,并采用恒虚警率匹配滤波器捕获法;在加性白高斯噪声信道、瑞利衰落信道和多址干扰情况下进行了仿真,分析了各种捕获性能:在选择性能最优的混沌序列、适当的序列长度、虚警概率及门限值的情况下,可以获得较短的捕获时间和较大的捕获概率。
• In 1999 , lim nguyen first brought forward a novel self - encoded spread spectrum ( sess ) system , in which spread spectrum sequence is fully built by the source data . it needs better understanding and studying on some problems , such as the principle of the sess system , the best coding of the spread sequence , communication synchronization and so on
  自编码直扩通信是limnguyen在1999年首次提出的一种利用信源数据构造扩频序列的随机直扩技术,此技术在自编码扩频机制、最佳扩频序列设计、自编码同步等方面还有待进一步的研究。