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28 Aug 09

Welcome to IEEE Xplore 2.0: On capacity of cognitive radio networks with average interference power constraints

  • On capacity of cognitive radio networks with average interference power constraints






    Cheng-Xiang Wang  

    Xuemin Hong  

    Hsiao-Hwa Chen  

    Thompson, J.  


    Joint Res. Inst. for Signal & Image Process., Heriot-Watt Univ., Edinburgh;







    This paper appears in: Wireless Communications, IEEE Transactions on



    Publication Date: April 2009


    Volume: 8, 

    Issue: 4



    On page(s): 1620-1625





    ISSN: 1536-1276


    INSPEC Accession Number: 10627523


    Digital Object Identifier: 10.1109/TWC.2009.071075


    <!--Start 2.5.3 code-->

    Current Version Published: 2009-05-02



    <!--End 2.5.3 code-->



















    Abstract

    Cognitive radio (CR) has been considered as a promising technology to improve the spectrum utilization. In this paper we analyze the capacity of a CR network with average received interference power constraints. Under the assumptions of uniform node placements and a simple power control scheme, the maximum transmit power of a target CR transmitter is characterized by its cumulative distribution function (CDF). We study two CR scenarios for future applications. The first scenario is called the CR based central access network, which aims at providing broadband access to CR devices. In the second scenario, the so-called CR assisted virtual multiple-input multiple-output (MIMO) network, CR is used to improve the access capability of a cellular system. The uplink ergodic channel capacities of both scenarios are derived and analyzed with an emphasis on understanding the impact of numbers of primary users and CR users on the capacity. Numerical and simulation results suggest that the CR based central access network is more suitable for less-populated rural areas where a relatively low density of primary receivers is expected; while the CR assisted virtual MIMO network performs better in urban environments with a dense population of mobile CR users.

Technology Review: Mapping a City's Rhythm

  • Mapping a City's Rhythm




    A phone application highlights hot spots and will soon show where different urban "tribes" gather.

08 Mar 09

Dynamic Tags

  • Expertise: Beginner

    Language: JavaScript


    September 6, 2005

    Dynamic <div> Tags

    Use JavaScript to make a <div> tag dynamically and then adds code to handle the onmouseclick event to it.": 

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    function element_event_onmouseclick() //its called for onmouseclick 
    { 
         	alert("Inside function onmouseclick");
       
    }


    Srimoyee Panda
07 Feb 09

Rover's GAE

终于碰到一个也喜欢自己折腾WebApp Map的人，哈哈！

tangf2004.appspot.com/1 - Preview

gps google maps internet services networks application blogs persons

  • OK，我的打算：

    http://Tangf.CnBlogs.Com ：还是我的主战场，把一些觉得可以放在这里的就尽量放在这里，一些太琐碎细小以及和技术无关的，基本上都不会放在这里。内容还是来自下面的技术blog和GPS站点，但不是全部。

    http://www.garminfans.cn(国外镜像：http://blog.garminfans.cn)：这是一个和GPS产品GPS产业相关的站点，将是我主要投入精力的地方，因为我真的希望能够告诉大家一些GPS的内容，希望能够对导航产业有一个良性的引导，当然话是说的大了，但至少是想让更多的人了解GPS产业。另外，此部分内容也会传到3snews站点，毕竟3snews还是一个非常不错的资讯站点，虽然一直也就那个样。

    http://www.ShareSh.cn：本来的打算仅仅是分享我在上海拍的一些照片，但一直拖到2008年才真的实现这一目标，08年1月终于将上海的近2000张照片整理完毕并上传，但其实那时我已经在北京了，然后北京又拍了很多的照片，整理了一下2000多张，所以就变成了分享上海和北京(分享上海：http://www.sharesh.cn/main.htm[国外镜像：http://sh.sharesh.cn]；分享北京：http://www.sharesh.cn/beijing/[国外镜像：http://bj.sharesh.cn])。北京自从08年国庆后拍的照片至今还是没有整理，够懒，另外页面方面也不是很满意，我是用纯粹的HTML做的，没有任何动态语言，纯手工，就是用VB写了个程序将重复的手工编程代码执行再变成HTML代码，反正工作量也不少。现在的想法是将原来纯粹的照片展示，变成游记、攻略、地图和照片四个TAB的内容，这样应该会比单纯的罗列照片要好很多，可惜的是个人还没有养成完事后立即写心得的习惯，所以此部分是一拖再拖。希望有时间的时候再整理一下吧。

    http://www.sharesh.cn/share(国外镜像：http://share.sharesh.cn)：其实这个是上面想法的延伸。现在都懒的拿相机了，但路过的地方又觉得有些好玩的就随意的用手机拍了下来，所以就促成了我建立一个blog来分享这些路过的照片的想法，可能也会讲述一些个人的生活经历和个人想法什么的吧。整理照片确实是一件麻烦的事情，就手机的照片我都更新的很慢，以前是在WEB后台更新的，速度慢的实在让我无法坚持，现在用Windows live writer要好多了，自动缩略图，支持wordpress、zblog连博客园都支持，还是很不错的。这些后面再写成技术类文章吧。但此站点仅仅是分享个人走过的看到的以及部分想到的。

    http://www.sharesh.cn/blog(国外镜像：http://blog.sharesh.cn)：这个其实是技术的主要站点，和上面的资讯以及分享类不同，所以我的副标题也就是三脚猫功夫的展示场，确实，我一直觉得我就会那么一点三脚猫功夫混点饭吃吃，今天把三脚猫功夫拿出来和大家分享，只希望大家能够互相学习互相进步吧。可能做技术的人就是很喜欢show或者说喜欢被别人肯定，我想写blog的人多少都会有一点这样的通病吧。当然，我也不能说是做技术的，毕竟我连编码都不会(会一点简单的VB和SQL)，不过我觉得解决问题的能力我还是有的，另外也可能与职业方向有一定关系，所以难以定位难以说清，我只是希望能够是一个外部和内部的桥梁。

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