Search Length (802.11a/g/j/p OFDM)

Menu Path: MeasSetup > IEEE 802.11a/g/j/p Demod Properties > Time tab

 Default: See OFDM Standard Presets Table

Search Length specifies the length of time to acquire the input signal (in seconds). This defines the length of time that the pulse search is performed. The Search Length data is shown in the Search Time trace.

The VSA searches within the specified Search Length and demodulates the first complete pulse (or burst) found. The pulse can occur anywhere within the Search Length. Pulses beyond the first complete pulse are disregarded and are not demodulated. In order for the pulse search algorithm to detect a pulse edge, the pulse must be at least 15 dB above the noise floor. The resultant pulse is then demodulated.

Longer pulse lengths increase the measurement time but make it more likely that a pulse will be found. If a pulse is not found a PULSE NOT FOUND status message is displayed.

See Also

Measurement Interval and Offset (802.11a/g/j/p OFDM)

Time Tab (802.11a/g/j/p OFDM)