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

Figure4-18

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

Figure4-19

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