Equalize (802.11b/g DSSS/CCK/PBCC)

Select the Equalize check box to apply the VSA's equalization filter to your measurement. Specify the filter length in the Filter Length text box.

Equalization and DSSS/CCK/PBCC modulation

A general overview of equalization is included under About Equalization and Using Equalization.

The 802.11b specification does not provide for equalization prior to computing EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format.. This means that any linear distortion, such as group delay distortion in the IF, will increase EVM. When EVM is high, the equalizer can be used as a diagnostic tool. If use of the equalizer significantly improves the EVM result, then the channel frequency response should be examined for flatness problems (i.e., group delay distortion). If it does not, then the problem is more likely related to noise, non-linear distortion, or spurious error.