R&S FSH
Digital Modulation Analyzer
Measurements on 1xEV-DO Signals
Operating Manual 1309.6275.12 - 14
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7.4.1.3 Channel Results
Channel results contain various results specific to one or more channels. The table
contains
C
the absolute channel power in dBm
C
the channel power in relation to the total signal power in dB
C
the channel power in relation to the pilot channel in dB
for the pilot channel (PICH), the MAC channel and the data channel.
The absolute and relative channel power is an average over the time the channel is
active in the measured slot.
In addition to the powers of the channels, the channel results also show quality
parameters for the pilot channel (PICH):
EVM
Error vector magnitude (EVM) of the pilot channel in %.
The EVM is the root of the ratio of the mean error power (root mean square) to the
power of an ideal reference signal.
An EVM of 0 % means a perfect signal.
Rho
Quality parameter Rho of the pilot channel.
Rho is specified in the CDMA2000 standard. It is the normalized, correlated power
between the measured signal and an ideal reference signal. The standard requires that
only the pilot channel is measured to get the results for Rho.
7.4.2 The PN Scanner
If you equip the R&S FSH with option R&S FSH-K47E, the PN scanner becomes
available.
If you are measuring over-the-air (OTA) signals, you can use the PN scanner result
display that shows the PN offset and the corresponding power. In order to be able to
determine the PN offsets of the base station you are scanning, you have to apply a
trigger to the R&S FSH from a GPS device such as the optional GPS receiver.
Note that the PN scanner result display shows the detected base station PN offsets as
well as the relative powers of these base stations. Above the display, the PN offsets
are listed in a table.
