By Jan Kruys
This booklet is set the speculation and perform of spectrum sharing and is geared toward a large viewers. even though it addresses simple technical matters, the emphasis is on perform instead of conception. In offering an total photo of spectrum sharing, this booklet covers the why--the regulatory points in addition to the how--the technical elements. The latter is supported with a theoretical taxonomy of dimensions, modes and technique of spectrum sharing and a couple of functional circumstances of spectrum sharing are mentioned, utilizing tested applied sciences as examples.
This e-book should still turn out available to instant platforms designers, RF engineers and protocol builders in addition to to planners for giant scale instant LAN deployments. the mix of theoretical rationalization and perform established research is anticipated to turn out helpful for radio spectrum managers and regulators in addition to criteria improvement organizations.
Further, this publication should still end up priceless for educators and scholars in that it offers perform orientated heritage for the extra summary fabric provided in textbooks facing radio spectrum similar theory.
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Additional info for Sharing RF Spectrum with Commodity Wireless Technologies: Theory and Practice
For a point source radiating into free space, the decay exponent is 2 – this reflects that the RF signal propagates as a sphere of increasing size. In practice, the decay exponent can vary from less than two to more than ten – the higher values reflecting refraction, and other forms of distortion as well as shadowing and blocking that affect the propagation of the RF waves. This subject is treated in more detail in Chap. 5, The Physics of Spectrum Sharing. Suffice it here to note that the two factors above make it impossible to accurately determine which piece of spectrum is used by whom at a given location.
G. WiMAX systems could be operated in this band as well; the modified rule allows “restricted contention protocols” in the Kolodzy . See FCC 07-78. 22 See FCC-05-56A1. 20 21 24 2 Radio Regulations and Policies lower 25 MHz. 23 Chapter 9 considers other co-existence issues related to WiMAX and other 4G technologies. 11 Working Group quickly ratified an Amendment (“y”) to their Wireless LAN standard that contains the technical requirements necessary for “wireless LANs” to operate under the new rules.
13 The literature on radar is vast. org/wiki/Radar). 15 From a spectrum sharing point of view, the importance of radio astronomy and other scientific uses of the radio spectrum lies in the fact that the very high gain of these systems make them very susceptible to man-made interference. 3 Spectrum Sharing Use of the radio spectrum has caused enormous changes in the ways people and organizations communicate, conduct their business and entertain themselves. Because of the apparently limitless propagation of radio waves, early spectrum “decisions” focused on separating different types of usages and different groups of users from each other in the spectrum domain: separate frequency bands were assigned to radio telegraphy, radio broadcasting, later radio telephony, radio-location (radar), etc.
Sharing RF Spectrum with Commodity Wireless Technologies: Theory and Practice by Jan Kruys