By Ron Olexa
This isn't one other ebook approximately fitting a house or "hobby" wireless procedure. as an alternative, this e-book indicates you the way to plot, layout, set up, and function WLAN platforms in companies, associations, and public settings similar to libraries and motels. In different phrases, this publication is full of critical details for severe pros accountable for imposing powerful, excessive functionality WLANs masking parts as small as a espresso store or as huge as complete groups. Ron Olexa offers an outstanding origin in RF/wireless thought because it applies to WLANs. His special, thorough insurance of propagation at GHz frequencies is helping you realize the mysteries of WLAN insurance (such as the way it can swap from season to season because of foliage). you will additionally know about antenna radiation styles and achieve so that you can layout you WLAN to have the assurance you would like with no inflicting interference to (or agony interference from) different WLANs. * Covers the generally used 802.11 kinfolk, in addition to the hot 802.16 and 802.20 criteria * makes a speciality of great advertisement community implementations, comparable to in public structures and companies * writer has over 25 years of expertise with mobile platforms and instant networks
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Extra info for Implementing 802.11, 802.16, and 802.20 Wireless Networks: Planning, Troubleshooting, and Operations
If the signal on the input gets too large, the device gets overdriven and no longer ampliﬁes in a linear fashion. This is why ﬁltering the signal coming from the antenna is critical. The energy contained in out of band signals can add to the total signal seen by the RF ampliﬁer and cause it to be overdriven, even if the desired signal is of low intensity. On the other hand, devices that can tolerate high power signals exhibit higher noise and lower sensitivity. Selection of the best compromise is up to the designer of the receiver and is based upon the average signal levels that will be seen at the device’s input.
In radio work, the most common coax has 50 or 75 ohm impedance. The most common for the systems discussed in this book are the 50 ohm varieties. Selecting the proper coax is important. The impedance must be correct in order for it to mate with the impedance of the antenna and radio. Energy ﬂows with the least impairment when the impedances of all elements are equal. Using a cable or antenna with a different impedance from the radio causes an impedance mismatch. This mismatch causes energy to reﬂect away from the load back towards its source.
By design, it will be simplistic in its approach. The intent is only to familiarize you with the basic operation of the building blocks of a radio-based system. Each of these building blocks is in reality a very complex device about which entire books have been written. If you’re interested in learning more about a particular subject, volumes of information can be found in other texts and in manufacturers’ literature. Radio is a word used to deﬁne a system involving the transmission and reception of an electromagnetic wave upon which has been impressed some form of information.
Implementing 802.11, 802.16, and 802.20 Wireless Networks: Planning, Troubleshooting, and Operations by Ron Olexa