Specifications

Chapter 9 77
Measuring Digital Communications Signals
Making Multi-Carrier Power (MCP) Measurements
Measuring Digital Communications
Signals
Making Multi-Carrier Power (MCP)
Measurements
The multi-carrier power measurement measures the total power of up
to 12 carriers and their adjacent channels for up to three pairs of offset
frequencies. The offset frequency properties can be modified, including
the offset frequency, the integration bandwidth and upper/lower limits.
The carrier parameters can also be modified including carrier width,
carrier integration bandwidth and whether the carrier is on or off. MCP
can be setup with no radio standard selected or with radio standard
settings for IS-95 and W-CDMA. Results for carriers without power
present are displayed relative to the reference carrier. Results for
adjacent channels are displayed in absolute power (dBm).
The following example shows how to make an MCP measurement on a
W-CDMA base station broadcasting with 8 carriers on and with two
carriers off. The transmitting carriers are spaced at 5 MHz intervals at
the following frequencies: 977.5 MHz, 982.5 MHz, 987.5 MHz,
992.5 MHz, 1.0075 GHz, 1.0125 GHz, 1.0175 GHz and 1.0225 GHz.
NOTE Recommended equipment: The Agilent ESG signal generators can
be used to transmit W-CDMA multi-carrier signals of up to 4 carriers.
The multi-carrier signal parameters can be modified including channel
setup, frequency offset and carrier power. An alternative way to setup
multiple carriers is to use multiple ESGs, each transmitting one
W-CDMA signal.
Step 1. Connect a W-CDMA signal with multiple carriers broadcasting at the
frequencies stated above.
Step 2. Set the center frequency of the analyzer to the midpoint of all the
carriers:
Press
Preset, Factory Preset (if present).
Press
FREQUENCY Channel, Center Freq, 1, GHz.
Step 3. Set the analyzer radio mode to 3GPP W-CDMA as a base station device:
Press
Mode Setup, Radio Std, 3GPP W-CDMA.
Press
Mode Setup, Radio Std Setup, Device (BTS).
Step 4. Select the multi-carrier power one-button measurement from the
measure menu and then optimize the reference level and attenuation
settings suitable for the MCP measurement:
Press
MEASURE, Multi Carrier Power.
Press
Meas Setup, Optimize Ref Level.
Step 5. Set the carrier number to 10 (in our multi-carrier setup we have 8
carriers without 2 middle carriers):