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= Investigating Hidden Nodes and RTS/CTS Access =

This application note presents results from a simple experiment using the [wiki:802.11 Mango 802.11 Reference Design] and its [wiki:802.11/wlan_exp experiments framework]. We use three WARP v3 nodes to build a basic 802.11 network, with one AP and two stations (STA). 

== Table of Contents ==
1. [#ExperimentalSetup Experimental Setup]
1. [#AggregateResults Aggregate Results]
1. [#TxRxLogResults Tx/Rx Log Results]
1. [#Resources Source Code]
1. [wiki:./appendix Appendix]

= Experimental Setup =

The experiments described below use 3 Mango WARP v3 kits, each running the [wiki:../../../Changelog#a1.3Release 802.11 Reference Design (version v1.3)], including the [wiki:../../../wlan_exp WLAN Experimental Framework].

||  [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:experimental_setup_photo.jpg, width=600)]]  ||
||  '''Experimental Setup'''  ||

== Experiment Details ==
 * Packet Length: 1400 byte payloads (1428 byte MPDUs, with MAC header and FCS)
 * PHY Rate: 18 Mbps (QPSK, code rate 3/4) for data MPDUs
 * Tx Power: 15 dBm
 * 2.4GHz channel 1

We use 4 traffic flows in our experiments:
 * '''Flow 1:''' Backlogged traffic from STA_1 to AP
 * '''Flow 2:''' Backlogged traffic from STA_2 to AP

 [[Image(wiki:802.11/wlan_exp/app_notes/dcf_with_multiple_flows/figs:experimental_flows.png, width=600)]] 

The colors in the figure above are used throughout this app note to denote each flow.

= Tx/Rx Log Results =


----

= Resources =

== Python Scripts ==

Download: [raw-attachment:multi-flow_python_scripts_v1_00.zip multi-flow_python_scripts_v1_00.zip]
 * Requirements:
  * 3 WARP v3 Kits configured as 1 AP and 2 STA
  * [wiki:802.11/Changelog#a1.0Release Mango 802.11 Reference Design v1.0]

Zip Contents:
 * '''multi-flow_experiment.py''' - This script will run the experiment and write the log files from each board to the directory in which this script is executed.
 * '''multi-flow_plotter.py''' - This script will open the generated log files and produce the plots used in the application note.
 * '''log_analysis_util.py''' - Utility script that is used by multi-flow_plotter.py. This should not be run directly. Instead, it should be in the same directory as multi-flow_plotter.py

== Experiment Data ==

In addition to providing the python scripts to gather and process the data in this application note, we also provide the actual data log files we gathered, processed, and presented.

Download: [http://warpproject.org/dl/app-notes/multi-flow_log_data_v1_00.zip multi-flow_log_data_v1_00.zip] (371MB)