NT1210
Lab 6.4: WLAN Placement
Exercise 6.4.1
There are three main types of antennas that can be used for WLAN APs: directional, omnidirectional, and right-angle. Describe each of these antenna types. You can get more powerful antennas that can broadcast longer distances. Why would these antennas be limited in use for standard WLAN placement in a home?
An omnidirectional antenna radiates transmissions out and receives transmissions in from all directions, although not equally in all directions. Most of the antennas in this category are thin rods or long flat sticks.
Exercise 6.4.2
Using Figure 6-12 as a guide, explain what type of antenna and which channel should be used for each of the APs that are placed. Given the capacity of each AP, is this placement sufficient to cover all the classrooms and labs? Why or why not?
A directional antenna is one that has a wide dispersion of more than 80 degrees and less than 120 degrees.
A highly directional antenna has a dispersion of 80 degrees to as little as 28 degrees, and is used for point-to-point transmission. Highly directional antennas use a line of perpendicular elements
Lab 6.4 Review
1. Radio signals attenuate through walls and obstacles. How would this affect AP placement in a home or office? Use your textbook and Internet research to justify your answer.
A AP’s signal would fade naturally the farther from the signal source you go but with the signal going through walls will further degrade the signal depending on the thickness of the wall. So you would have to account for walls or objects that could further degrade your signal from the source.
2. To which AP will a student in Classroom B connect? What about a student in Classroom A? What about a student in Lab A?
A student in classroom b connect to AP3. The student in classroom A will connect to AP2. A student in lab a would connect to AP 2.
3. Would more powerful antennas improve the AP placement in Figure 6-12? Why or why not? Use your textbook and Internet research to justify your answer.
A more powerful antenna would increase the singal output and should (should not could) make the signal able to keeps more of its strength with the increased signal output.
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References: [M.1225] ITU-R Recommendation M.1225, "Guidelines for evaluation of radio transmission technologies for IMT-2000," 1997 [Okumura1968] T. Okumura, E. Ohmore, and K. Fukuda, "Field strength and its variability in VHF and UHF land mobile service," Rev. Elec. Commun. Lab., pp. 825-73, September-October 1968. [Hata1980] M. Hata, "Empirical formula for propagation kiss ub kabd nibuke radui services," IEEE Trans. Veh. Tech., pp. 317-25, August 1980. [COST231] European Cooperative in the Field of Science and Technical Research EURO-COST 231, "Urban transmission loss models for mobile radio in the 900- and 1,800 MHz bands (Revision 2)," COST 231 TD(90)119 Rev. 2, The Hague, The Netherlands, September 1991, available at http://www.lx.it.pt/cost231/final_report.htm [Ikegami1984] F. Ikegami, S. Yoshida, T. Takeuchi, and M. Umehira, “Propagation factors controlling mean field strength on urban streets,” IEEE Trans. on Antennas Propagation, vol. 32, no. 8, pp. 822– 829, Aug. 1984. [Walfisch1988] J. Walfisch, H. L. Bertoni, "A theoretical model of UHF propagation in urban environments," IEEE Trans. on Antennas and Propagation, vol. 36, no. 12, pp. 1788-1796, Dec. 1988 [Erceg1999] V. Erceg et. al, “An empirically based path loss model for wireless channels in suburban environments,” IEEE JSAC, vol. 17, no. 7, July 1999, pp. 1205-1211. [Hari2000] K.V. S. Hari, K.P. Sheikh, and C. Bushue, “Interim channel models for G2 MMDS fixed wireless applications,” IEEE 802.16.3c-00/49r2, November 15, 2000, available as www.ieee802.org/16/tg3/contrib/802163c-00_49r2.pdf [Erceg2001] V. Erceg, et al, "Channel Models for Fixed Wireless Applications," IEEE 802.16.3c01/29r4, July 2001, available as www.ieee802.org/16/tg3/contrib/802163c-01_29r4.pdf [Molisch2005] Andreas F. Molisch, "Wireless Communications," Wiley 2005, 622 pp. and associated web page http://www.wiley.com/legacy/wileychi/molisch/supp/appendices/Chapter_7_Appendices.pdf [Goldsmith2005] Andrea Goldsmith, "Wireless Communications," Cambridge University Press, 2005, 644 pp. [Andrews2007] Jeffrey G. Andrews, Arunabha Ghosh, and Rias Muhamed, "Fundamentals of WiMAX: Understanding Broadband Wireless Networking,", Prentice-Hall, February 2007, 496 pp. [Cichon] Dieter J. Cichon, Thomas Kurner, "Propagation Prediction Models," Chapter 4, Available at www.it.lut.fi/kurssit/04-05/010651000/Luennot/Chapter4.pdf…
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