Introduction to Wireless Local Loop: Broadband and Narrowband Systems (2nd Edition)
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Featuring developing technologies, updated market forecasts, and current regulatory initiatives, this text aims to keep the reader at the forefront of emerging products, services and issues affecting the field of wireless local loop (WLL) technology. The second edition includes new chapters on WLL deployment, the WLL market, and a substantial review of broadband technologies, as well as new sections on prediction of user requirements and the emerging UMTS standard.
installed lines in the year 2000. PA predicted that by the year 2000 more than 10% of all lines being installed would be wireless, while others predicted that the number of wireless lines installed per year could overtake wired lines before the year 2005. By early 1999 it was clear that these forecasts were hopelessly flawed. In January 1999 it was estimated that fewer than 2 million lines had been installed worldwide and that was only expected to increase to around 4 million by the year 2000.
would help Ionica. It didnt, and during 1998 BT offered all the Ionica customers a free passage back to their network. Ionica has now been closed down and the equipment disposed of. Within all of these reasons are many points from which operators could learn in the future. However, no issues fundamental to WLL have been suggested and it would appear that, although unfortunate, the demise of Ionica is not necessarily an indication that other WLL operators will fail. 6.3 How the market will
shortage of codes, but the interference from other users becomes slightly more problematic. It is worth going into this topic in a little more detail because the allocation of codewords has become a parameter that an operator needs to define in some CDMA WLL systems. Codewords are explained further in Section 8.6. Based on the discussion so far, it is apparent that the capacity of a CDMA system is limited by the amount of interference generated by other users employing the same frequency. As
PHS has simpler connection to the PSTN. ◗ PHS base stations have lower power consumption. Most of those claims have been discussed. However, it is worth examining the capacity issue in more detail. The starting point is to note that DECT has 12 traffic channels per 2-MHz bandwidth, that is, six per megahertz, while PHS has four traffic channels per 300-kHz bandwidth, or 13 per megahertz. However, PHS requires around 3 dB more cochannel protection as a result of its more complex modulation
legacy of 500 million copper lines worldwide, changing over to IP will be far from simple. IP The converging world of telephony, TV, and computers 17 is ill suited to voice transmission because of its variable delays. IP is ill suited to transmission over mobile radio networks due to the large header size, which means it uses scarce radio spectrum inefficiently. New versions of the IP protocol may start to overcome some of these problems, but others will remain more fundamental. Nevertheless,