Introduction to Wireless Local Loop: Broadband and Narrowband Systems (2nd Edition)
William Webb
Language: English
Pages: 421
ISBN: 1580534759
Format: PDF / Kindle (mobi) / ePub
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.
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Voice, and (potentially) video is likely to undermine significantly their business case. WLL operators also are operating in a world where competitors are not just the PTOs but also the terrestrial and satellite broadcasters and the cellular operators, against which appropriate strategies must be developed. Finally, broadband WLL technologies started to become available during 1999. These provide the WLL operator with higher bit rates, allowing them to compete more directly against the other.
Summary of access technologies Table 3.3 provides a summary of all the access technologies discussed in this chapter. The next part of the book examines in more detail the environments and economics of WLL and shows why predictions for WLL networks are currently showing rapid growth. 40 Introduction to Wireless Local Loop Table 3.3 Comparison of Different Access Technologies Access Technology Data Rates Advantages Disadvantages Voiceband modems <56 Kbps Low cost, immediate installation.
In the first part to show exactly where and 44 Introduction to Wireless Local Loop why WLL is appropriate and where it has been to date. Chapter 4 considers the different telecommunications environments in the world and analyzes the need for WLL in each of these environments. This analysis is complemented by a short history of WLL, illustrating where its key market areas lie. Chapter 5 builds on the qualitative analysis of different markets by considering the general economics of WLL and.
Deployed during 1999 GSM half rate 6.5 Kbps Slightly worse than GSM full rate Unlikely to be widely used TETRA 4.4 Kbps To be demonstrated enhanced speech quality, was introduced in 1999, and other improvements can be expected. The data rate required for WLL speech has already fallen to 16 Kbps and probably will fall as low as 8 Kbps in 5 to 10 years. Further advances beyond that would be entirely possible. 8.2 Error-correction coding and interleaving Information transmitted via a.
Practice such amplifiers are extremely expensive and inefficient in their use of power. In summary, the advantage of FDMA is that it is the simplest access method to implement. The disadvantages are the following: ◗ The loss of efficiency caused by imperfect filtering; ◗ The expensive radio frequency (RF) elements required at the base station. Now that technology has advanced to the point at which other access methods can be implemented at relatively low cost, the single advantage of FDMA is.