Anritsu 3GPP, Measurement Manual

Page: 113 / 244

LTE Signal Analyzer 5-4 LTE Modulation Measurements
3GPP MG PN: 10580-00234 Rev. Y 5-9
Markers
Markers are available for use in the Power vs Resource Block measurement. The markers will
outline the selected RB. Above the two-dimensional grid, the specific RB subcarrier/sub-frame
coordinates will be displayed along with its power level.
Constellation
This measurement displays the constellation of the demodulated symbols over the first
sub-frame and a results table of the measurements described below. See
Figure 5-7
on page 5-12 .
Ref Signal (RS) Power
Reference Signal power displayed in dBm or Watts. The reference signal is used for downlink
channel estimation.
EVM (rms)
The RMS (%) of all the error vectors, between the reconstructed ideal signals and the received
signals, divided by the RMS value of the ideal signals. When
EVM Max Hold
is
On
(
Setup
menu), two values are displayed. The first number is the maximum EVM (rms) value since
Reset and the second number is the current measured value. Reset occurs when setup
parameters are changed or by toggling the
EVM Max Hold
button.
Freq Error
The difference between the measured carrier frequency and the specified carrier frequency is
the frequency error. This number is only as accurate as the frequency reference that is used,
and is typically only useful with a good external frequency reference or GPS.
Carrier Frequency
Carrier Frequency is the measured transmitter operating center frequency.
Sync Signal (SS) Power
Sync signal power displayed in dBm or Watts.
EVM (pk)
The peak (%) of all the error vectors, between the reconstructed ideal signals and the received
signals, divided by the RMS value of the ideal signals. When
EVM Max Hold
is
On
(
Setup
menu), two values are displayed. The first number is the maximum EVM value since
Reset and the second number is the current measured value.
Freq Error (ppm)
Freq Error displayed in parts per million (ppm).
Cell ID
Cell identifying information sent by the transmitter in the sync signal.