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Spectral Flatness
Definition
Spectral flatness is a measurement of the power variations in the carriers of an OFDM (IEEE 802.11A) signal.
Standards
- IEEE Std 802.11a-1999 16 September 1999 Paragraph 17.3.9.6.2 Spectral Flatness
Measurement Subtleties
Spectral flatness only applies to OFDM in the IEEE 802.11a and HyperLan/2. It is measured during the 8us channel estimation phase of the burst, with all 52 carriers active but after the start of a normal burst. (See the figure for an example measurement).
Test Tools
You need a receiver capable of measuring power over the entire bandwidth of the signal to make this measurement. Either a Keysight ESA-E or PSA spectrum analyzer could make this measurement. Both analyzers also have a built-in measurement that displays the entire transmit spectral mask.