http://ciscoarticles.com/rss/rss.php en-us Copyright 2012, ahmetalperenemir@gmail.com ahmetalperenemir@gmail.com Cisco Articles http://ciscoarticles.com/rss/rss.php Collection hourly 4 1901-01-01T00:00+00:00 http://ciscoarticles.com/3G-Handset-and-Network-Design/Early-Efforts.html Motorola proposed what turned out to be a rather overambitious project known as Iridium. Other vendor consortia, which included companies like Hughes and Raytheon with space sector experience, proposed similar projects. After a number of years, spectrum was allocated, and after a number of years, systems were built. In the meantime, terrestrial networks—first and ... en-us Early Efforts http://ciscoarticles.com/rss/article_view.php?articleId=5535 Copyright 2012, 2011-11-09T00:00:00+02:00 text http://ciscoarticles.com/3G-Handset-and-Network-Design/Satellite-Networks.html Satellite Networks In the 1980s, first-generation cellular systems generally provided quite poor geographic coverage. It varied substantially from country to country and from operator to operator, but typically you might experience demographic coverage of 70 percent to 80 percent of the population, which would equate to 50 percent to 60 percent geographic coverage. The difference ... en-us Satellite Networks http://ciscoarticles.com/rss/article_view.php?articleId=5534 Copyright 2012, 2011-11-09T00:00:00+02:00 text http://ciscoarticles.com/3G-Handset-and-Network-Design/Setting-the-Stage-for-Satellite.html Setting the Stage for Satellite An alternative method of hiding RF and switch hardware, and avoiding the NIMBY factor, is to put the hardware up in the sky or into space. There have been a number of proposals and demonstration projects showing the possibility of mounting transceivers in weather balloons or unpiloted high-flying aircraft ... en-us Setting the Stage for Satellite http://ciscoarticles.com/rss/article_view.php?articleId=5533 Copyright 2012, 2011-11-09T00:00:00+02:00 text http://ciscoarticles.com/3G-Handset-and-Network-Design/The-NIMBY-Factor.html The NIMBY Factor One reason for hiding base stations and antennas is that if people don’t know that the hardware is there, they cannot complain about it—the “not in my back yard,” or NIMBY factor. Although it is well beyond the scope of this book to discuss exposure limits, it is an area of ... en-us The NIMBY Factor http://ciscoarticles.com/rss/article_view.php?articleId=5532 Copyright 2012, 2011-11-09T00:00:00+02:00 text http://ciscoarticles.com/3G-Handset-and-Network-Design/Wireless-Delivery-Platforms-.html Alternative Fixed-Access and Mobility Access Wireless Delivery Platforms As we move up in frequency, particularly above 10 GHz, radio waves behave in a very similar way to light. We showed in Chapter 11 that it makes a lot of sense to do indoor RF calculations, using similar design techniques to those used in lighting ... en-us Wireless Delivery Platforms http://ciscoarticles.com/rss/article_view.php?articleId=5531 Copyright 2012, 2011-11-09T00:00:00+02:00 text