wiki:802.11/Benchmarks/Rx_Char

Version 5 (modified by chunter, 9 years ago) (diff)

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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% 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)
6 Mbps BPSK 1/2 -82
9 Mbps BPSK 3/4 -81
12 Mbps QPSK 1/2 -79
18 Mbps QPSK 3/4 -77
24 Mbps 16-QAM 1/2 -74
36 Mbps 16-QAM 3/4 -70
48 Mbps 64-QAM 1/2 -66
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 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 WLAN Experiments Framework to measure PER.

No image "experimental_setup.jpg" attached to 802.11/Benchmarks/Rx_Char
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)
    2. 10 different scrambling sequence start points to generate waveforms with different peak-to-average-power (PAPR) features
  2. Load each waveform in to the N4010A's volatile memory as segment files.
  3. Create N4010A sequence files that send each waveform segment 1000x in a row
  4. Use WLAN Experiments Statistics to determine how many of the transmissions were fully received with a good FCS.

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