Changes between Version 3 and Version 4 of 802.11/Benchmarks/Rx_Char

Timestamp:

Dec 9, 2014, 10:15:33 AM (9 years ago)

Author:

chunter

Comment:

--

802.11/Benchmarks/Rx_Char

@@ -3 +3 @@
 = Receiver Characterization =
 
-The IEEE 802.11 Standard specifies a minimum receiver sensitivity that all 802.11 devices must achieve. This sensitivity is specified as a receive power (in dBm) in which a device must achieve no worse than a 10% PER for PPDU receptions of 1000 octets. The receiver minimum input sensitivity requirements are specified in Section 18.3.10.2 of 802.11-2012 and are reproduced here:
+The IEEE 802.11 Standard specifies a minimum receiver sensitivity that all 802.11 devices must achieve. This sensitivity is specified as a receive power (in dBm) in which a device must achieve no worse than a 10% packet-error-rate (PER) for PPDU receptions of 1000 octets. The receiver minimum input sensitivity requirements are specified in Section 18.3.10.2 of 802.11-2012 and are reproduced here:
 
 ||=  Rate  =||=  Modulation / Coding  =||=  Minimum Sensitivity (dBm)  =||
@@ -15 +15 @@
 ||  54 Mbps  ||  64-QAM 2/3  ||  -65  ||
 
+The values specified in this table recognize that higher rate transmissions require higher SNR (and therefore higher delivered power) than lower rate transmissions.
 
+== Receiver Sensitivity Test ==
+
+To test our Rx PHY against these measures, we use the [http://www.keysight.com/en/pd-326092-pn-N4010A/wireless-connectivity-test-set?&cc=US&lc=eng Keysight N4010A Wireless Connectivity Test Set] to generate known-good 1000 octet transmissions and deliver those transmissions to WARP v3 at a specified power. Then, we use the [wiki:802.11/wlan_exp WLAN Experiments Framework] to measure PER.
 
 ||  [[Image(experimental_setup.jpg, width=600)]]  ||
 ||  [[Image(setup.png, width=600)]]  ||
 ||  '''Experimental Setup'''  ||
+
+
+=== Methodology ===
+1. Construct PPDU waveforms in MATLAB for each PHY rate that have the following characteristics:
+  1. 1000 octet PPDU length (i.e., a 972 byte payload + 14 byte MAC header + 4 byte FCS)
+  1. 10 different scrambling sequence start points to generate waveforms with different peak-to-average-power (PAPR) features
+1. Load each waveform in to the N4010A's volatile memory as segment files.
+1. Create N4010A sequence files that send each waveform segment 1000x in a row
+1. Use [https://warpproject.org/docs/mango-wlan-exp/node.html#statistics-commands WLAN Experiments Statistics] to determine how many of the transmissions were fully received with a good FCS.