無線寬頻網(wǎng)絡(luò)設(shè)計規(guī)劃研究報告-文庫吧資料
2024-08-17 01:14本頁面
【正文】 s replaced by blue and light gray is replaced by orange. Following are some zoomed in views for Figure 5 and Figure 6.%%.. Figure 7 Zoomed in view of Figure 5. Figure 8 Zoomed in view of Figure 6.We will consider another example with smaller area below. The system as shown in Figure 9 has a dimension of 230 m by 340 m. Thirtyseven AP’s are included. Some sites are on top of each other but have different elevations, as they are on different floors. All parameters are same as the previous example. The major difference is that the area of this example is much smaller.(2)的面積比案例(1)小了許多.The coverage of all AP’s is shown in Figure 10. As can be seen in Figure 11, three AP’s can cover the whole area 100 percent. Since there are three nonoverlapping channels available, there will be no cochannel interference if only two AP’s are used.Figure 9 Example of 37 Ap’s Figure 10 Coverage of the 37AP Example Figure 11 Coverage of three AP’sCONCLUSIONSThe above two examples illustrate that for small areas, the design is simple because the whole area can be covered by no more than three AP’s. And there is no cochannel interference if no more than three channels are used. When many AP’s are used, for bigger area, channels have to be reused and the first example illustrates a systematic procedure for system optimization..The blocking issue is not addressed here because the transmitter power cannot be adjusted. On the other hand, if the power is fixed, there is a saturation point as to how many AP’s can be deployed in an area. If we use more AP’s beyond the saturation, the coverage might improve, but the cochannel interference will get worse. Since the number of AP’s can be saturated, the capacity also has a maximum and cannot be further enhanced.In general, if the transmitter power can be adjusted like in a cellular system, we can acmodate more traffic. In high traffic density area, we can lower the power and install more AP’s and vice versa. This makes the design more plex but this is the only way that the blocking issue can be dealt with.. References[1] William . Lee, “Mobile Communications Engineering”,McGrawHill, 1982.[2] Asha Mehrotra, “Cellular Radio: Analog and Digital Systems”, Artech House Publishers, 1994. [3] Griff L. Bilbro and Wesely E. Snyder, “Optimization of Functions with Many Minima”, IEEE Trans. On Systems, Man and Cybernetics, vol. 21, No. 4, July/August 1991.相關(guān)訊息請參閱……30 / 30。 when one goes up, the other goes down. When we start removing AP’s from the system, unavoidably, the coverage goes down. The goal here is to remove AP’s in an optimum way such that the maximum number of AP’s can be removed while the coverage stays above 90 %. If we can tolerate a lower coverage, we can set f higher and more AP’s can be removed. When we set f at , the optimization result is indicated in Figure 4. Fourty AP’s remain with coverage of %. The removed AP’s are shown in Green.%,%.綠色的圓圈表示從系統(tǒng)中刪除的AP. Figure 4 Cove
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1