WNMC_Exercise 1 - Wireless Channels, Propagation, & Computations

 

Scenario 1

As a new graduate network engineer, you are tasked with designing a robust public Wi-Fi network for a busy urban square. The area comprises multiple high-rise buildings, trees, and moving people. You are to ensure reliable connectivity for the mobile network users.

Question: Explain how multipath fading will impact the network's performance in the urban city square. Propose specific strategies you will put in place to mitigate the effects of multipath fading. How will each of these strategies improve signal quality and data reliability for the mobile users?

Scenario 2 

As a telecommunications consultant, you are hired by a company to deploy a new cellular base station to provide coverage for a remote rural community. The area is fairly flat with few obstacles, but the distance between the base station and users can be several kilometers.

Question: Using the Friis transmission equation, calculate the required transmitter power (in Watts) for the base station to ensure a minimum received power of −100 dBm at a distance of 10 km. Assume the transmitter antenna gain (Gt​) is 12 dBi, the receiver antenna gain (Gr​) is 2 dBi, and the operating frequency (f) is 2 GHz. Show all steps of your calculation.

Scenario 3

As a network administrator for a hospital, you are tasked with setting up a reliable wireless link to transfer critical patient data from a mobile cart to the central server. The system needs to support a high data rate and be highly secure. The received signal power is −80 dBm, and the noise power is −60 dBm.

Question:

1.     Compute the Signal-to-Noise Ratio (SNR) in dB for this wireless link.

2.     Based on your calculated SNR, explain why this SNR is adequate for the task (Note: it is patient-critical data being transmitted via the link). 

3. Explain what you can do to improve the SNR.