By Andrew Miceli
A instruction manual for technicians, making use of wisdom of significant instant communications applied sciences to the real-world events that technicians come upon on a daily basis. This moment version beneficial properties fabric on such severe applied sciences as GPRS, area, CDMA-2000 and WCDMA, and comprises an advent to community layout and function concerns.
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Additional info for Wireless Technician's Handbook (Artech House Mobile Communications Library) 2nd edition
Example text
As long as the cells were far enough apart so as to not to interfere with each other, frequencies could be reused. Planning these frequency channel plans thus became a large part of the cellular industry. The design engineer must estimate decide the distance required before reusing frequencies. Too much distance will naturally decrease spectrum efficiency. 4 The coverage area of a cell depends on several factors, including the power output of the transmitter, the performance of the receiver, the terrain (including some dynamic, seasonal terrain aspects, such as foliage), as well as the amount of interference in the system.
Thus, NA-TDMA, or IS-54 and later IS-136, was born. IS-136 uses the same channel spacing as the analog system and can use the same control channels as well. This allowed for a seamless transition to digital. In all of North and South America IS-136 had become a leading force, largely because of the ease of implementation. With three time-domain channels per 30kHz channel, this system can quickly improve system capacity over AMPS. The Americas did take another path as well in designing a system for capacity.
This magnifies their already existing coverage issues. Thus, the concept of the tower-top amplifier was developed. Like the repeater, the tower-top amplifier is a low-noise amplifier designed to allow the base station to receive lower level signals. One of the issues with tower-top amplifiers is that they very often will add noise as they increase the desired signal. Known as the noise figure, this can be the limiting factor for their ability to receive low-level signals. The ability of a system to receive a signal and demodulate it correctly is very often determined by the S/N ratio.