= Investigating Physical Carrier Sensing in the DCF with Multiple Traffic Flows =

== Appendix: Multi-Flow Performance of Different PHY Rates ==

We have characterized the same quad-flow network for different PHY rates we well. This appendix summarizes that study.

=== Experiment Setup ===

To test the different PHY rates, we sought to further eliminate uncontrolled variables by conducting the experiment over RF cabling and attenuators.

[[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:OTW_setup.png, width=500)]]

The above figure shows the experimental setup. The RF power splitter/combiner used is a [https://warpproject.org/trac/attachment/wiki/802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs/ZAPD-2-272%2B.pdf?format=raw Mini-Circuits ZAPD-2-272+]. The above configuration of attenuators roughly approximates an equilateral triangle topology, where each of the three nodes is connected with and is in carrier sensing range of the other two.

 * Packet Length: 1400 byte payloads (1428 byte MPDUs, with MAC header and FCS)
 * Tx Power: 5 dBm
 * Trial Duration: 300 seconds
 * 2.4GHz channel 1
 * Physical Carrier Sensing Threshold: approximately -70 dBm

=== Results ===

The data shown below uses the same visualizations that are explained in [wiki:../ the original application note].

||=  PHY Rate  =||=  Throughput vs. Time  =||=  Throughput Histogram  =||
||=  6 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R0_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R0_xput_hist.png, width=300)]]  ||
||=  9 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R1_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R1_xput_hist.png, width=300)]]  ||
||=  12 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R2_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R2_xput_hist.png, width=300)]]  ||
||=  18 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R3_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R3_xput_hist.png, width=300)]]  ||
||=  24 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R4_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R4_xput_hist.png, width=300)]]  ||
||=  36 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R5_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R5_xput_hist.png, width=300)]]  ||
||=  48 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R6_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R6_xput_hist.png, width=300)]]  ||
||=  54 Mbps  =||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R7_xput_vs_time.png, width=300)]]  ||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:R7_xput_hist.png, width=300)]]  ||