多用户MIMO系统THP预编码研究

详细论述非线性预编码THP原理,并对其结构进行了分析、改进,进一步增加系统容量,使其在系统容量和鲁棒性方面获得更好的平衡点。     

自适应THP模运算因子选取方法

以下行多用户多输入单输出(MU-MISO)系统为例,分析了在发送端采用汤姆林森-哈拉希玛预编码(THP)时,模运算因子的选取对系统性能的影响。通过考察每一步与该因子相关的数据处理过程,说明了在低信噪比(SNR)区域,为了获得较好的系统性能,应当在保证星座图不重叠的基础上,使模运算因子尽可能地小。而后通过固定SNR下的梯度调整,寻找出最佳的模运算因子。通过仿真可以看出,理论分析结果与蒙特卡洛仿真结果相吻合,随着SNR的增加,系统的最佳模运算因子趋于某个固定值,该值与经典论文在对应调制方式下的推荐值相接近。为了优化低SNR区域的系统性能,该文进一步提出了一种自适应的模运算因子选取方法。     

CSIT获得中带有错误呈现的鲁棒THP设计

In this paper, a robust THP is proposed for broadcast channel in multi-user multi-input multi-output (MU-MIMO) system, in which the channel uncertainty caused by feedback delay and mobile speed is taken into account. In order to acquire the imperfect channel state information at transmitter (CSIT), a dynamic CSIT model is introduced where the channel temporal and spatial correlations are considered. By utilizing the unchanged channel statistics and accurate outdated feedback channel information jointly, the...     

多用户多天线系统中基于THP的低复杂度调度排序算法

本文提出了下行多用户多天线系统中一种新的基于Tomlinson-Harashima预编码(THP)的低复杂度调度排序算法.该算法根据THP与误符号率的特点,将调度和排序结合在一起,有效降低了复杂度.仿真结果表明,本文提出的算法在平均误符号率性能上逼近贪婪调度best-first排序,而复杂度更低,在实际系统中有很好的应用价值.     

ZTE to Provide DSL Equipment to Telemar

ZTE Corporation, China's largest listed telecommunications manufacturer and leading wireless solutions provider, has been selected by Telemar, Brazil's largest fixed line operator, to provide IP-based DSLAM terminals and ATM DSLAM for its DSL infrastructu…     

Solutions to Smooth Evolution from GSM to WCDMA

Concerning the development trend of the GSM/GPRS network,andfrom the angle of radio networks and core networks,this article pre-sents three concrete solutions to the evolution towards WCDMA.Itpoints out that the overlay network scheme has the minimum impacton the operation of current networks,and ensures the evolution ofNGN to all-IP networks and the smooth transition of 2G services.     

ZTE in Strategic Alliance to Bring Triple Play Broadband to India

World-class Television over IP (TVolP) and high-speed broadband Internet access will be just some of the services available in the NCR region of Delhi, India following an agreement reached between ZTE Corporation and Atlas Interactive (India) Private Limited. The strategic alliance, expected to be worth more than one billion Rupees, involves supplying and commissioning a TVolP network as the foundation for a range of triple play (voice, video and data) services for subscribers. "This…     

Preface to the JESTC

It is a pleasure to write a few words on the occasion of the publ ication of the first issue of the Journal of Electronic Science and Technology of China.Electronics is a vast field and there must be millions of pages of technical papers on electronics published every year.The Institute of Electrical and Electronics Engineers(IEEE)has over one hundred journals,     

ZTE Teams with Polkomtel to Deliver Unprecedented Access to Multimedia Applications

ZTE Corporation,a leading global provider of telecommunications equipment and network solutions,announced on June 6,2007 that it has signed a strategic cooperation agreement with Polkomtel S.A.,one of the top three mobile telephony operators in Poland.     

Service-oriented Access to Next Generation Networks—from Service Creation to Execution

Existing telecommunication networks and classical roles of operators are subject to fundamental change. Many network operators are currently seeking for new sources to generate revenue by exposing network capabilities to 3rd party service providers. At the same time we can observe that services on the World Wide Web (WWW) are becoming mature in terms of the definition of APIs that are offered towards other services. The combinations of those services are commonly referred to as Web 2.0 mash-ups. Rapid service design and creation becomes therefore important to meet the requirements in a changing technology and competitive market environment. This report describes our approach to include Next Generation Networks (NGN)-based telecommunications application enabler into complex services by defining a service broker that mediates between 3rd party applications and NGN service enablers. It provides policy-driven orchestration mechanisms for service enablers, a service authorization functionality, and a service discovery interface for Service Creation Environments. The work has been implemented as part of the Open SOA Telco Playground testbed at Fraunhofer FOKUS.     

An Approach to High-Order Cumulants Used to Detect Multifrequency Signalsin Telephone Networks

1 Introduction There are two kinds of signals in distance telephone networks. One is a line signal, the other, a multifrequency signal. The multifrequency signals are divided into forward ones and backward ones. The forward signals adopt the coding patter…     

浅谈B to B电子商务

讨论B to B的基本结构、组成及其主要技术，并介绍了B to B的一些市场情况。     

赤柱——Welcome to Wonderland

这本来不是一个我熟悉的地方，电影中，电视上，书本里，更熟悉的香港，应该是荷里活道、鸭寮街、旺角、西贡、铜锣湾……惟一一次见过赤柱，还是《鉴证实录》里一闪而过的美利楼一角。可自打去过之后，凡有人问起，我总忙不迭地推荐赤柱。     

You''''ll get attached to us

SMTA(Surface mount Technology Association)是一个全球性的表面贴装技术协会。SMTA组织一年一次的     

Relax to win新款手机游戏

没错，这个像耳塞一样的家伙就是未来游戏的操纵杆。飞利浦（Philips）与知名电信运营商Orange共同开发未来的手机和电脑游戏，而游戏的理念就是“Relax to win”。游戏时将操纵杆夹在手指间，传感器会收集皮肤的导电情况以判断玩家是否处在放松状态，并通过无线电传送到电脑或者手机上，当你足够放松时，屏幕上的恐龙就会飞起来。     

Push to Talk业务简析

Push to Talk被视为能够给运营商带来显著利润增长的新数据业务，应用前景业界非常看好。本文对PTT业务的发展现状、业务特性、市场应用等方面进行了简要分析。     

ZTE Shows Commitment to India

ZTE Corporation, China's largest listed telecommunications manufacturer and leading wireless solutions provider, is showing its commitment to India by sponsoring a programme to help students at Jawahar Vidyalaya higher secondary school in Chennai, southern India. Through the programme, organised by Bharat Vikas Parishad, ZTE has donated books and other study materials, uniforms and equipment to enable students with disabilities to lead more independent lives. "I am very pleased to be abl…     

GIO to Sleep睡眠眼罩

失眠已经成为现代人的流行病之一，为了能让自己每天能尽快地与周公”唠嗑”，人们可谓”八仙过海，各显神通”，但归根到底也不过就是“数绵羊”式的让自己能集中所有的精力到睡觉这件事上来。Glo to Sleep睡眠眼罩就是一件能让你轻松集中精力的助眠佳品。眼罩内部各有两条发光带，它们并不用电，只需将它们对着灯光照射会儿，当它们发出幽蓝光线时就可以工作了。光带的发光度很低，只有0.16 lUX，并随时间推移会降至0.01lux，但在完全黑暗的眼罩中，隔着眼皮它们也能让你充分地将精神集中起来，以类似于冥想催眠的方式尽快入睡。     

P to P和软交换

电话网发展的第一阶段是逐步过渡到以软交换为核心的网络,但软交换在许多地方沿用了电话网的思路,并不是纯粹以IP为基础通信网的最佳选择。它作为电话网向IP网演进的权宜之计和过渡方案而登场,但是IP网的无连接特性和开放性注定了软交换的作用将是昙花一现的;未来发展的趋势是网络将趋于简单,而终端将越来越复杂,功能越来越强大;在电话网发展的第二阶段,在纯IP的环境中具有更高效率的通信模式,将会成为通信的主流。