In recent years, cellular voice networks have transformed into powerful packet-switched access networks for both voice communication and Internet access. Evolving Universal Mobile Telecommunication System (UMTS) networks and FIRST Long Term Evolution (LTE) installations now deliver bandwidths of several megabits per second to individual users, and mobile access to the Internet from handheld devices and notebooks is no longer perceived as slower than a Digital Subscriber Line (DSL) or cable connection. Bandwidth and capacity demands, however, keep rising because of the increasing number of people using the networks and because of bandwidth-intensive applications such as video streaming. Thus, network manufacturers and network operators need to find ways to continuously increase the capacity and performance of their cellular networks while reducing the cost.
標(biāo)簽： BRINGING NETWORKS Beyond and 3G 4G
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
A decade ago, I FIRST wrote that people moved, and networks needed to adapt to the reality that people worked on the go. Of course, in those days, wireless LANs came with a trade-off. Yes, you could use them while moving, but you had to trade a great deal of throughput to get the mobility. Although it was possible to get bits anywhere, even while in motion, those bits came slower. As one of the network engineers I worked with put it, “We’ve installed switched gigabit Ethernet everywhere on campus, so I don’t understand why you’d want to go back to what is a 25-megabit hub.” He un- derestimated the allure of working on the go.
標(biāo)簽： Survival 802.11 Guide
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
Without conceding a blemish in the FIRST edition, I think I had best come clean and admit that I embarked on a second edition largely to adopt a more geometric approach to the detection of signals in white Gaussian noise. Equally rigorous, yet more intuitive, this approach is not only student-friendly, but also extends more easily to the detection problem with random parameters and to the radar problem
標(biāo)簽： Communication Foundation Digital in
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
Homogeneous Partitioning of the Surveillance Volume discusses the implementation of the FIRST of three sequentially complementary approaches for increasing the probability of target detection within at least some of the cells of the surveillance volume for a spatially nonGaussian or Gaussian “noise” environment that is temporally Gaussian. This approach, identified in the Preface as Approach A, partitions the surveillance volume into homogeneous contiguous subdivisions.
標(biāo)簽： Receivers Adaptive Antennas and
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
YoumayaskwhyIwrotethisbook.Therearemany,manypersonalreasonsaswithanyauthor I suppose. The FIRST two reasons and probably the most important are my love of flying and my love of radio engineering. This may sound rather dull but I love flying in any machine be it balloon, glider, propeller aircraft, microlight through to airline jets and the experience of it. The more I do it the more I feel I understand it.
標(biāo)簽： Communication Aeronautical Systems Radio
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
One traditional view of how wireless networks evolve is of a continuous, inevitable progres- sion to higher link speeds, combined with greater mobility over wider areas. This standpoint certainly captures the development from FIRST and second generation cellular systems focused on voice support, and the early short-range wireless data networks, through to today’s 3G cellular and mobile broadband systems; there is every confidence that the trend will continue some way into the future.
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
The aim of this book, the FIRST of two volumes, is to present selected research that has been undertaken under COST Action IC0902 ‘‘Cognitive Radio and Net- working for Cooperative Coexistence of Heterogeneous Wireless Networks’’ (http://newyork.ing.uniroma1.it/IC0902/). COST (European Cooperation in Sci- ence and Technology) is one of the longest-running European frameworks sup- porting cooperation among scientists and researchers across Europe.
標(biāo)簽： Communication Cognitive
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
In 2005, when the world crossed-over to Web 2.0, business professionals and managers in every industry – from traditional retail to high tech media and telecom – felt the FIRST powerful tremors of the strategic shifts taking place, sweeping away traditional business models and altering competitive landscapes.
上傳時(shí)間： 2020-05-27
上傳用戶(hù)：shancjb
Mobile communication has gained significant importance in today’s society. As of 2010, the number of mobile phone subscribers has surpassed 5 billion [ABI10], and the global annual mobile revenue is soon expected to top $1 trillion [Inf10]. While these numbers appear promising for mobile operators at FIRST sight, the major game-changer that has come up recently is the fact that the market is more and more driven by the demand for mobile data traffic [Cis10].
標(biāo)簽： Coordinated Multi-Point
上傳時(shí)間： 2020-05-27
上傳用戶(hù)：shancjb
How will future generations refer to our times? Will it be known as one of space exploration, genetics, atomic energy or computing? Possibly, but I think it is more likely to be ‘The age of communications’. Not since printed books and newspapers were FIRST introduced has there been such an explosion of communication. None of this technology could function without modern cables and, just as important, competent installers.
標(biāo)簽： Applications Cabling Copper
上傳時(shí)間： 2020-05-27
上傳用戶(hù)：shancjb
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