Please refer to the User Guide for selecting the LTE Signal Analyzer mode, setting up frequency, amplitude, and file management. In addition, perform the following 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 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.
Note
The Modulation Constellation will show a QPSK constellation when PBCH is being measured. PBCH Only mode is useful when making measurements over the air under conditions where the transmitted data uses MIMO.
The instrument also automatically selects PBCH only when OTA measurements are selected.
PBCH only is also necessary when connecting directly to the transmitter and MIMO is used, when measuring live traffic and assuming that precoding is used in that eNodeB.
4. Press Sync then the Sync Type submenu key to select between the Normal (SS) or RS for synchronization. RS should be selected ONLY when there is no sync signal. This happens only when directly connected to a base station that is configured such that one of the antenna ports does not have a sync signal. When RS is selected, the Cell ID submenu key becomes active. Enter the Cell ID of the base station. The Cell ID field is automatically populated with the last measured Cell ID for user convenience.
Note
Sync Type RS is only supported when BW is set to 10 MHz.
5. Press Back to return to the Setup main menu.
Antenna Status
The Antenna Status indicator can show when antennas are detected and which one is currently being measured. Antenna Status is displayed for any EVM measurement shown: Constellation, Control Channel Power, Modulation Summary and LTE Summary. The antennas icons are displayed at the lower‑left corner of the display screen (Figure: Antenna Status).
