12
Spectrum Master™ MS2720T Spectrum Analyzer Features
TD-SCDMA/HSPA+ Measurements (Option 882)
RF Measurements
Channel Spectrum
Channel Power
Occupied Bandwidth
Left Channel Power
Left Channel Occ B/W
Right Channel Power
Right Channel Occ B/W
Power vs. Time
Six Slot Powers
Channel Power (RRC)
DL-UL Delta Power
UpPTS Power
DwPTS Power
On/Off Ratio
Slot Peak-to-Average Power
Spectral Emission
RF Summary
Demodulation
Code Domain Power/Error
(QPSK/8 PSK/16 QAM/64 QAM)
Slot Power
DwPTS Power
Noise Floor
Frequency Error
Tau
Scrambling Code
EVM
Peak EVM
Peak Code Domain Error
CDP Marker
Modulation Summary
Over-the-Air (OTA) Measurements
Code Scan (32)
Scrambling Code Group
Tau
E
c
/I
o
DwPTS Power
Pilot Dominance
Tau Scan (Six)
Sync-DL#
Tau
E
c
/I
o
DwPTS Power
Pilot Dominance
Record
Run/Hold
Pass/Fail (User Editable)
Pass Fail All
Pass/Fail RF
Pass Fail Demod
Measurements
Occupied Bandwidth
Channel Power
Channel Power RCC
On/Off Ratio
Peak-to-Average Ratio
Frequency Error
EVM
Peak EVM
Peak Code Domain Error
Tau
Carrier Feedthrough
Noise Floor
TD-SCDMA/HSPA+ Measurements
The Spectrum Master features three
TD-SCDMA/HSPA+ 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.
Error Vector Magnitude (EVM) is the ratio
of errors, or distortions, in the actual
signal, compared to a perfect signal. EVM
faults will result in poor signal quality to
all user equipment. In turn, this will result
in extended hand off time, lower sector
capacity, and lower data rates, increasing
dropped and blocked calls.
Peak Code Domain Error (Peak CDE)
Peak CDE is the EVM of the worst code.
Code Domain displays show the traffic
in a specific time slot. Peak CDE faults
will result in poor signal quality to all
user equipment. In turn, this will result
in extended hand off time, lower sector
capacity, and lower data rates.
OTA Tau Scanner E
c
/I
o
E
c
/I
o
faults indicate excessive or
inadequate coverage and lead to low
capacity, low data rates, extended
handoffs, and excessive call drops.
DwPTS OTA Power Mapping
DwPTS OTA Power when added to
E
c
/I
o
gives the absolute sync code power
which is often proportional to PCCPCH
(pilot) power. Use this to check and plot
coverage with GPS. Coverage plots can
be downloaded to PC based mapping
programs for later analysis. Poor readings
will lead to low capacity, low data rates,
excessive call drops and call blocking.
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 uneven amplitude of sub-carriers. Data will
be less reliable on weak sub-carriers, creating a lower
overall 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.
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