CS 6710: Wireless Networks

Due: Tuesday February 23, 5PM

In this assignment, you will get introduced to Qualnet, a network simulator with significant support for wireless networks that is widely used both commercially and within the academic research community.  

1. Setup and reading: Download and install Qualnet following the instructions sent by email.  

2. A two-node wireless network scenario: Set up the following scenario.
   

   Node number:            2
   Terrain:                    1000*1000
   Traffic pattern:        CBR
   Packet Length:          512B
   Data Rate:                1Mbps
   Simulation time:      10s
   Static Routing
   
   Also set the following values for these physical layer parameters:
   Propagation Limit: -111.0dBm
   Antenna Eficiency: 1.0
   Antenna Mismatch Loss: 0.0dB
   Antenna Connection Loss: 0.0dB
   Antenna Model: Omnidirectional
   
   
3. Transmission range: Find out the corresponding transmission ranges of 8 settings obtained by varying the following 3 dimentions:
   
   Tx Power:               1dBm, 10dBm,
   Tx Receive Threshold:   -81.0dBm, -91dBm
   PROPAGATION-PATHLOSS:    FREE-SPACE,  TWO-RAY
   
   Compare the results for the 8 different settings, and compare the results of the free space setting with the equations for the free space model studied in class.
    
4. Performance analysis of different signal coding schemes: Set the following parameters.
   
   Transmission Power: 1dBm
   Receiver Sensitivity -100.9
   Reception Threshold   -100.9
   
   Using BER as the receiving criteria, compare the packet loss ratios under three different coding schemes: BPSK, DPSK, DQPSK. 
   Plot the packet loss rate as a function of traffic distance, varying the distance in step of 20 meters from 250m to 350m.
   
   Change the packet length to 32B, repeating the above simulations.