802.11n MIMO

Open NetSim, Select Examples -> Internetworks -> Wi-Fi -> 802.11n-MIMO then click on the tile in the middle panel to load the example shown in below Figure


The following network diagram illustrates what the NetSim UI displays when you open the example configuration file for 802.11n-MIMO.


Network Settings

  1. Environment Grid length: 50m * 50m
  2. Distance between AP and Node is 20m.
  3. Set DCF as the medium access layer protocol under datalink layer properties of access_ point and wireless node
  4. Click on the Application icon present in the top ribbon/toolbar and set Transport Protocol to UDP
  5. WLAN Standard is set to 802.11n and No. of Tx and Rx Antennas is set to 1 in both access point and wireless node (Right-Click Access Point or Wireless Node > Properties > Interface Wireless > Transmitting Antennas and Receiving Antennas)
  6. Channel Characteristics $\rightarrow$ Path Loss only, Path Loss Model $\rightarrow$ Log Distance and Path loss Exponent$\rightarrow$ 3. (Wireless Link Properties.
  7. CBR application with 50Mbps generation rate. (Set Inter Arrival Time: 233 (micro sec)).
  8. Enable Plots.
  9. Simulate for 10 sec and check the throughput.
  10. Go back to the scenario and increase the Number of Tx and Rx Antenna 1*1 to 2*2, 3*3, 4*4 respectively and check the throughput in the results window.

Results and Discussion#

Number of Tx and Rx Antenna Throughput
1 x 1 23.97 Mbps
2 x 2 31.05 Mbps
3 x 3 33.38 Mbps
4 x 4 35.96 Mbps

MIMO is a method for multiplying the capacity of a radio link using multiple transmit and receive antennas. Increasing the Transmitting Antennas and Receiving Antennas in PHY Data rate (link capacity) and hence leads to an increase in application throughput