3GPP MG PN: 10580-00234 Rev. T 6-1
Chapter 6 — TD-LTE Signal Analyzer
6-1 Introduction
The Time-Division Long Term Evolution (TD-LTE) Signal Analyzer offers three
measurement options:
• RF Measurements
The following display types are provided for RF measurements: Channel Spectrum
display, Power vs. Time, ACLR display, Spectral Emission Mask display, and the RF
Summary table.
• Modulation Measurements
Modulation measurements can be viewed in Power vs Resource Block, Constellation
display, Control Channel Power display, or the Modulation Summary table.
• Over-The-Air (OTA) Measurements
Over-the-Air measurements include Scanner, Tx Test, Coverage Mapping, and Carrier
Aggregation. EMF measurements are available with Option 444.
6-2 General Measurement Setups
Please refer to the User Guide for selecting the TD-LTE Signal Analyzer mode, setting up
frequency, amplitude, and file management. In addition, perform the following TD-LTE
specific setup procedures.
1. Press the Setup main menu key.
2. Press the BW submenu key to open the Select Bandwidth list. Select the desired
Bandwidth with the arrow keys or rotary knob and press Enter.
3. Press the EVM Max Hold submenu key On to display both the Maximum EVM value
since Reset and the current measured value. This applies to EVM RMS and Peak
values. Selecting Off displays only the current measured value.
4. Press the EVM Mode submenu key to select either Auto or PBCH Only. Selecting Auto
measures Physical Downlink Shared Channel (PDSCH) if data is available, otherwise
it measures Physical Broadcast Channel (PBCH), a control channel that carries a
broadcast message. Selecting PBCH Only forces a PBCH measurement.
5. Press the Trigger submenu key. The Trigger menu opens to set Trigger Source and
Trigger Polarity. For Trigger Source, select No Trig or Ext. Then select the trigger edge
by setting Trigger Polarity to Rising or Falling. Press the Back submenu key to return to
the Setup menu.
6. (Not applicable for all models) Press the Ext. Ref. Freq submenu key to configure the
instrument using an external reference frequency. The External Reference Frequency
list opens. Highlight the desired frequency and press Enter.
Note
The Constellation will show a QPSK constellation when PBCH is being measured.
PBCH Only mode is especially useful when making measurements over the air
under conditions where the transmitted data uses MIMO.
To Next Page
Loading...
