Table 5-10; Table 5-11 - Viavi CX100 ComXpert Operation Manual

Chapter 5 RF Instrument Function Descriptions
RF Test
Control/Setting
Coarse Search
Frequency
Control/Setting
Modulation Type
Modulation Order
Symbol Rate
Oversampling
Number of Symbols
Control/Setting
Gain
Equalizer Length
Equalizer Plot
Length
5.2.7.6.3 Digital Filter Types
The CX100 Digital Demod filters are used to limit bandwidth and reduce inter-symbol
interference (ISI). The CX100's digital demodulator produces a measured signal and a
reference signal. The measured signal is the signal that results from demodulating the
waveform; the reference signal is the signal that results from demodulating a signal that
contains no errors.
Rev 002
5 - 26
Table 5-9 Digital Meter General Settings (Continued)
Description
The Coarse Search Frequency setting determines
whether or not the digital receiver searches for the received
signal if the signal is not present at the defined Center
Frequency.
When this is enabled, the coarse frequency estimation
block of the VSA computes a rough estimation of the
frequency offset of the received signal and searches for the
signal within the estimated offset range.
Table 5-10 Digital Meter Modulation Settings
Description
This menu selects the digital modulation type of the signal
being analyzed.
This field defines the number of possible symbols in the
constellation of the modulation.
This field defines the number of symbols per second of the
received signal.
This field defines the number of samples per symbol to
analyze the signal.
This field defines the number of symbols used to calculate
the parameters in each block of data.
Table 5-11 Digital Meter Equalizer Settings
Description
The equalizer gain is used to adjust the coefficients of the
equalizer filter.
This field defines the length in number of taps of the
equalizer filter.
This field defines the number of points of the spectrum plot
of the channel estimated by the equalizer.
CX100 ComXpert Operation Manual 22144015
August 2023