At last , this dissertation present an algorithm that performs joint frequency offset acquisition , channel estimation and data detection for each active user . users ’ separation is accomplished at the base station through space - alternating generalized - expectation ( sage ) techniques 最后本文给出了一种可以对每个用户进行载波频偏获取、信道估计和数据侦测的盲信道同步算法,并借助于sage算法在基站( bs )对用户信号进行分离。
However , multiuser detection techniques exploit the underlying structure induced by the spreading codes of active users in ds / cdma system . it can efficiently suppress mai and mitigate near - far effect , which dramatically improves the performance and increase the capacity of ds / cdma system 而多用户检测技术则充分利用了系统扩频码内在的结构信息，能有效的抑制多址干扰、克服远近效应，极大的提高系统容量、改善系统性能。
Striving for superexcellent technology - oriented for over 7 - year , tencent keep steady developing space in high speed . more than 5 . 805 hundred million registered accounts and enormous active users demonstrate our powerful technological capabilities of various im applications and of internet applications with big load and traffic Qq超过5 . 805亿截止到2006年12月31日注册帐户的庞大受众群体现了腾讯对强负载大流量网络应用和各类即时通信应用的技术实力。
But the frequent use of training sequence is certainly a waste of channel bandwidth . research shows that with the prior knowledge of only the signature waveform and timing of the user of interest , blind adaptive multiuser detector can effectively detect data symbol of the desired user without training data sequence for every active user 在传统多用户检测技术基础上，自适应多用户检测利用训练序列在仅知道期望用户地址pn码及其定时信息条件下就可以进行检测，不足的就是训练序列占用了额外的频率资源。
Based on the method of subspace , the problems of the estimation of active users and timing in asynchronous cdma systems are studied , the algorithms of the estimation of active user and timing are given , and the performances are analyzed . furthermore , the problems of the estimation of channel parameters and timing are discussed in multipath fading asynchronous cdma communication system 基于多子波神经网络的多用户检测方法是在已知激活用户数和时延等信道参数的假设下提出来的，但是在通信过程中这些参数都是随时间变化的，因此必须对这些参数进行实时地估计。
Users who are leaving the university of macau are urged to copy those files and emails which they would like to retain onto removalbe storage or transfer their files to other valid user accounts , they should also transfer any available balance from their purchased quota for the printing service to another active user 所有即将离开本校的用户，请紧记将所有需要保存的文件及电子邮件复制到可携式装置上，或将这些文件转存到其他有效的用户帐户中去，并且将其所购买的打印服务馀额转给另一位有效的用户。
In this paper we present an association _ rule - based recommendation system . which extract usage paterns from web log file and use the concept lattice as its data structure storing frequent itemsetso and we show how to use concept lattice generated to compute a recommendation set for the active user , on real time 本文提出了一个基于关联规则挖掘的个人化技术，它使用概念格( conceptlattice )作为存储频繁页面集的数据结构。我们将讨论如何利用这个结构实时地为当前用户产生推荐集，以及这个结构与web语义内容相结合的优势。
For domino 6 . 5 testing , we used 1 . 5 gb for the nsf buffer pool , but for domino 7 we needed to shrink this back to the default of 1 . 2 gb due to the increased numbers of users we needed to support . we also increased server pool tasks , server max concurrent trans , and nsf dbcache maxentries to better deal with the increased numbers of active users 对于domino 6 . 5的测试来说，我们使用了1 . 5 gb作为nsf缓冲池的大小，但是对于domino 7来说，需要将这个值缩减为缺省的1 . 2 gb ，因为我们需要支持更多用户。
Recognize the current focused topic of interests to the active user as his navigational pattern . define the page recommendation ranking function , considering that whether a page has been visited by active user in his current session should be distinguished among pages to be suggested . design and implement a recommendation algorithm with high accuracy and low time 4 .确定当前用户感兴趣的主题为该用户的访问模式;将候选推荐集中的web页面是否已被当前用户访问过所带来的推荐权值差异考虑其中,确定最终的推荐函数;设计并实现具有较高精确性及较低时间复杂度的推荐算法。
Traditional multiuser detector make good use of all signals which resuilt in multiple access interference so that it provides optimum mai resistance . ( 1 ) nevertheless , it assumes that the receiver can acquire the signature waveform and timing of desired user and the interfering users ; ( 2 ) it has no ability to suppress intercell multiple access interference ; ( 3 ) it cannot be applied in downlink channels . adaptive multiuser detector eliminates the need to know the signature waveforms and the timing of the interferes and has to need training data sequences for every active user 传统多用户检测在单用户检测技术基础上，充分利用造成多址干扰的所有用户的信息进行联合检测，从而具有良好的抗多址干扰能力，但存在一些缺陷： ( 1 )不仅要求知道期望用户的地址pn码及其定时信息，还要求其他干扰用户的地址pn码及其定时信息； ( 2 )不能消除其他相邻小区的多址干扰对本小区的影响； ( 3 )不能直接应用在cdma移动通信系统中的下行链路。
