Eq Impulse Response (802.11a/g/j/p OFDM)

Menu Path: Trace > Data > Channel X > Eq Impulse Response where X is the selected channel.

When 802.11a/g/j/p OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. Demodulation is enabled, Eq Impulse Response trace data shows the impulse response of the equalization filter.

This is similar to, but not the same as, the Digital Demod Eq Impulse response. The differences are:

• Digital Demodulation computes this by comparing the IQ Meas Time and IQ Ref Time data, while 802.11a/g/j/p OFDM digital demodulation computes it from the preamble of the burst.
• Digital Demodulation typically uses a running average to average multiple scans when computing the equalizer impulse response. 802.11a/g/j/p OFDM demodulation does not average, but computes a new equalizer response for each burst.
• The equalization filter is inherent to 802.11a/g/j/p OFDM Demodulation, it cannot be enabled/disabled like Digital Demodulation.

See Also

Ch Frequency Response (802.11a/g/j/p OFDM)

Available Trace Data (802.11a/g/j/p OFDM)