By William Webb Ph.D.
That includes constructing applied sciences, up-to-date industry forecasts, and present regulatory projects, this article goals to maintain the reader on the vanguard of rising items, companies and concerns affecting the sphere of instant neighborhood loop (WLL) expertise. the second one version comprises new chapters on WLL deployment, the WLL industry, and a considerable evaluate of broadband applied sciences, in addition to new sections on prediction of consumer necessities and the rising UMTS typical.
Read or Download Introduction to Wireless Local Loop: Broadband and Narrowband Systems (Artech House Mobile Communications Library.) PDF
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Extra info for Introduction to Wireless Local Loop: Broadband and Narrowband Systems (Artech House Mobile Communications Library.)
Other successful cellular systems include the cdmaOne standard and the IS-136, or TDMA cellular standard. Both have been used for Access technologies 37 WLL, as discussed later, both in cellular frequency bands and other available bands. For example, IS-136 systems have been deployed in South America in the 400-MHz band as WLL solutions. Cellular systems have many disadvantages as an access technology, particularly low capacity and high cost. In developed countries, it can be expected that for some time they will continue to fulfill the role of providing mobility but will not present significant competition to the other access methods.
However, the same spectrum cannot be used in adjacent cells because interference would occur. The spectrum typically needs to be divided into clusters of 11 cells to avoid interference, that is, each cell has around 36 MHz of spectrum. Some cells cover millions of users, with the result that each subscriber has only a few tens of hertz. Thus, providing individual services for each subscriber, such as VoD, clearly is not going to be possible. Satellite is in a similar situation. It has more spectrum, around 1 GHz in total, and does not need to divide that spectrum among different cells in the same manner as terrestrial.
Some earlier cable networks require substantial reengineering to allow voice traffic to be carried. 1 Competing Providers in a Convergent World Entity Technology Telephony Broadcast Computer PTO Twisted pair, ISDN, xDSL One and two lines VoD High-speed asymmetrical access Narrowband WLL operator Wireless Two lines No 64-Kbps access Cellular operator Cellular and cordless One line No Limited but mobility Cable operator Coax One and two lines 50+ channels High-speed symmetrical Terrestrial broadcast Analog and digital TV No 510 channels Some download potential Satellite broadcast Analog and digital No 50+ channels No Broadband WLL operator Wireless Yes 50+ channels High-speed asymmetrical or symmetrical access An operator that can offer all types of service through one access medium should be well placed to maximize economies of scale and hence succeed in the marketplace.