Atec Anritsu-MT8221B - Manual (Page 13)

13
BTS Master™ Base Station Analyzer Features
cdmaOne/CDMA2000 1X Signal Analyzers (Options 0042, 0043, 0033)
RF Measurements
(Option 0042)
Channel Spectrum
Channel Power
Occupied Bandwidth
Peak-to-Average Power
Spectral Emission Mask
Multi-carrier ACPR
Demodulation
(Option 0043)
Code Domain Power Graph
Pilot Power
Channel Power
Noise Floor
Rho
Carrier Feed Through
Tau
RMS Phase Error
Frequency Error
Abs/Rel/ Power
Pilot
Page
Sync
Q Page
Code Domain Power Table
Code
Status
Power
Multiple Codes
Code Utilization
Over-the-Air (OTA) Measurements
(0ption 0033)
Pilot Scanner (Nine)
PN
E
c
/I
o
Tau
Pilot Power
Channel Power
Pilot Dominance
Multipath Scanner (Six)
E
c
/I
o
Tau
Channel Power
Multipath Power
Limit Test – 10 Tests Averaged
Rho
Adjusted Rho
Multipath
Pilot Dominance
Pilot Power
Pass/Fail Status
CDMA Signal Analyzers
The BTS Master features three CDMA
measurement modes:
• RF Measurements
• Demodulation
• Over-the Air Measurements (OTA)
The goal of these measurements is
to increase data rate and capacity by
accurate power settings, ensuring low
out-of-channel emissions, and good signal
quality. These attributes help to create a
low dropped call rate, a low blocked call
rate, and a good customer experience.
Cell site technicians or RF engineers can
make measurements Over-the-Air (OTA)
to spot-check a transmitter’s coverage and
signal quality without taking the cell site
off-line. When the OTA test results are
ambiguous one can directly connect to the
base station to check the signal quality
and transmitter power.
Adjacent Channel Power Ratio (ACPR)
ACPR measures how much of the carrier
gets into neighboring RF channels. ACPR,
and multi-channel ACPR, check the closest
(adjacent) and second closest (alternate)
RF channels for single and multicarrier
signals. High ACPR will create interference
for neighboring carriers. This is also an
indication of low signal quality and low
capacity, which can lead to blocked calls.
RMS Phase Error
RMS Phase Error is a measure of signal
distortion caused by frequency instability.
Any changes in the reference frequency
or the radio’s internal local oscillators will
cause problems with phase error. A high
reading will cause dropped calls, low signal
quality, low data rate, low sector capacity,
and blocked calls.
Noise Floor
Noise Floor is the average level of the
visible code domain noise floor. This will
affect Rho. A high noise floor will result
in dropped calls, low signal quality, low
data rate, low sector capacity, and blocked
calls.
E
c
/I
o
E
c
/I
o
indicates the quality of the signal
from each PN. Low E
c
/I
o
leads to low data
rate and low capacity.
RF Measurements – Spectral Emissions Mask
The 3GPP spectral emission mask is displayed. Failing
this test leads to interference with neighboring carriers,
legal liability, and low signal quality.
Modulation Quality – EVM
High or low values will create larger areas of cell-to-
cell interference and create lower data rates near cell
edges. Low values affect in-building coverage.
Over-the-Air Measurements – Sync Signal Power
Check for un-even amplitude of sub-carriers. Data will
be less reliable on weak sub-carriers, creating a lower
over-all data rate.
Pass/Fail Test
Set up common test limits, or sets of limits, for
each instrument. Inconsistent settings between base
stations, leads to inconsistent network behavior.