Implementing 802.11, 802.16, and 802.20 Wireless Networks: by Ron Olexa

By Ron Olexa

This isn't one other publication approximately fitting a house or “hobby” wireless method. in its place, this publication indicates you ways to plot, layout, set up, and function WLAN structures in companies, associations, and public settings akin to libraries and motels. In different phrases, this booklet is full of critical details for critical pros liable for imposing powerful, excessive functionality WLANs masking components as small as a espresso store or as huge as whole groups.

Ron Olexa offers a great starting place in RF/wireless thought because it applies to WLANs. His targeted, thorough assurance of propagation at GHz frequencies is helping the mysteries of WLAN assurance (such as the way it can switch from season to season as a result of foliage). You’ll additionally know about antenna radiation styles and achieve so that you can layout you WLAN to have the assurance you wish with no inflicting interference to (or discomfort interference from) different WLANs.

  • Covers the commonly used 802.11 kin, in addition to the hot 802.16 and 802.20 standards
  • Focuses on large advertisement community implementations, resembling in public structures and businesses
  • Author has over 25 years of expertise with mobile structures and instant networks

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Extra info for Implementing 802.11, 802.16, and 802.20 Wireless Networks: Planning, Troubleshooting, and Operations (Communications Engineering)

Sample text

It just so happens that in the case of the PA system, the frequencies fall into the range of human hearing, and the medium conveying them (air) allows these mechanical vibrations to be heard. The same thing happens in the RF oscillator, but it normally happens at frequencies outside the range of human hearing and it occurs not with physical vibration of the air, but with electrical and magnetic vibration described by the AC signal. Simple oscillators like those shown in Figure 2-4 rely on the resonant characteristics of either a tuned LC circuit or the resonance exhibited by a quartz crystal.

So a resonator can also be constructed from a piece of quartz crystal sandwiched between two conducting plates. When voltage is applied to the conducting plates, it causes mechanical stress in the crystal. A frequency exists at which the crystal will start to vibrate, stressing and relaxing in a rhythmic pattern. The resonant frequency of a quartz crystal is dependent upon its physical size. The most important dimension is its thickness. Quartz crystals exhibit a very stable resonant frequency, and are commonly used in modern oscillators as to generate the fundamental frequency that will ultimately become the transmitted RF signal.

These channels are nothing more than smaller slices of spectrum that are assigned to a transmitter and receiver and define their exact operating frequency. These channels are of varying spectral size and quantity, these characteristics being dictated by the band and type of communication service to be offered. RF Generation and Transmission Generation of the RF signal is the duty of the transmitter. The transmitter is comprised of a number of elements, each having a unique duty. A block diagram of a simple transmitter is shown in Figure 2-3.

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