Homework SourseWireless Architecture Introduction Objective Using the provi
Wireless Architecture
Introduction:
Objective: Using the provided manufacturer specification sheets, determine if two 802.11AC wireless routers will be able to communicate with each other in multiple locations, and if so, which antenna should be used and why. The table below shows the distances between router locations shown in the diagram.
Position 1
Position 2
Position 3
Position 4
Position 5
0 meters
120 meters
215 meters
215 meters
120 meters
0 meters
100 meters
160 meters
100 meters
0 meters
70 meters
100 meters
0 meters
90 meters
Preparatory Reading:
The following sections from the indicated texts or documents should be read before carrying out this lab:
Text: Chapter 5 Sections 5.2
Objective Achievement Steps:
Step 1: Below is the Cisco specifications manual link for an Aeronet Access Point, that includes the minimum receive level for an 802.11n (-75dBm is more received power than -90 dBm), identify the transmit (again using 802.11n output power (here, the greater the positive number, the greater the transmit power), and a list of compatible antennas. Use an antenna gain of 2 dBi (both transmit and receive), with a dipole radiation pattern, and 802.11n frequency range (both 2.5 GHz and 5 GHz). Ignore any transmission line loss. Assume that your system uses a Modulation and Coding Scheme #5 (MCS5) and transmits with an HT20 (4 antennas) at max power for 2.4 GHZ and HT40 (4 antennas) at max power for 5 GHz.
Provide separate results for the 2.4 GHz frequency and the 5 GHz frequency.
https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-3600-series/data_sheet_c78-686782.html
Step 2: Using the presented building layout, the objective is to determine whether or not the link can be closed between two access points (APs) identified in the specification sheet. The diagram shows the possible locations for the WiFi Aps
Step 3: Using equation 5.4 in your text and assuming isotropic antennas in an obstructed factory (n=3), compute the path loss that will occur between the possible router positions. Add another column to the table above and list the path loss between each of the potential locations.
Step 4: Using the stock MIMO antenna (4 antennas) with 2 dBi gain, will all the APs be able to communicate directly? Calculate the receive signal level (RSL) between each of the potential locations. Create another table showing the RSL between each of the stations. Compare the RSL values with the minimum required power levels shown in the data sheet for each of the frequency ranges.
Step 5: Compare the RSL values with the minimum required power levels shown in the data sheet. Create another table indicting whether the two APs will be able to communicate. If the links cannot be closed between two locations, identify which locations cannot communicate directly. Does it make a difference whether you are communicating at 2.4 GHz or 5 GHz? Explain.
Step 6: How much antenna gain is required to close the link between the router positions that currently cannot communicate. Is this a practical antenna?
Step 7/conclusion: Complete a practical discussion on the amount of overhead/headroom that should be left when designing real wireless systems. This should be an analysis that includes critical thinking about real world problems with simple models.
| Position 1 | Position 2 | Position 3 | Position 4 | Position 5 |
| 0 meters | 120 meters | 215 meters | 215 meters | 120 meters |
| 0 meters | 100 meters | 160 meters | 100 meters | |
| 0 meters | 70 meters | 100 meters | ||
| 0 meters | 90 meters |
Solution
ANS:-
Given that,
Objective: Using the provided manufacturer specification sheets, determine if two 802.11AC wireless routers will be able to communicate with each other in multiple locations, and if so, which antenna should be used and why. The table below shows the distances between router locations shown in the diagram.
So, from the table mentioned above lets compute the total distance of coverage of each of the given routers
Dist (P2) = Dist (P1, P2) + Dist (P3, P2) + Dist (P4, P2) + Dist (P5, P2)
= (120 + 100 + 160 + 100) metres = 480 metres
Dist (P3) = Dist (P1, P3) + Dist (P2, P3) + Dist (P4, P3) + Dist (P5, P3)
= (215 + 100 + 70 + 100) metres = 485 metres
Dist (P4) = Dist (P1, P4) + Dist (P2, P4) + Dist (P3, P4) + Dist (P5, P4)
= (215 + 160 + 70 + 90) metres = 535 metres
Dist (P5) = Dist (P1, P5) + Dist (P2, P5) + Dist (P3, P5) + Dist (P4, P5)
= (120 + 100 + 100 + 90) metres = 410 metres
Hence, we see that Postion 4 is the best antenna location, since it covers the maximum range amongst the others.
