HSDPA displays the spreading factor (OVSF codes) 256 or 512 codes and high speed downlink physical shared channel codes HS‑PDSCH. The right or left active codes can be selected using the cursor. The selected code power versus time and constellation are displayed. The demodulator also displays CPICH, P‑CCPCH, S‑CCPCH, PICH, P‑SCH and S‑SCH power in table format.
HSDPA Measurement Summary
Note
This screen is available with the W-CDMA/HSDPA demod option only.
HSDPA Procedure
1. Press the Demodulator submenu key to list the Demod menu.
2. Press the HSDPA submenu key to activate the HSDPA measurement. The red dot on the submenu key indicates HSDPA is selected.
3. If needed, press the HSDPA key again to display the HSDPA measurement signal parameters.
4. Press the Total Time submenu key to set the time or the Single Sweep Time submenu key to set the time for the power versus time display. The maximum time is 72 hours.
5. Use the cursor to select the desired code. The code parameters are displayed on the screen.
6. Press the IQ Persistence submenu key and use the keypad or rotary knob to set the IQ Persistence to 2. The instrument will display the constellation diagram after the first sample, and then update the constellation diagram after the second sample. IQ Persistence can be set as high as 48. When the maximum is reached, the first sample is replaced.
Note
The W-CDMA modulation type is QPSK, and the HSDPA modulation is 16QAM or QPSK.
Activating Markers
1. Press the Marker main menu key to display the Marker menu.
2. Press the Marker submenu key to select the appropriate marker (1 through 6). The underlined marker number is the currently selected marker.
3. Press the On/Off submenu key to activate the selected marker.
4. Press the Marker Table submenu key to display the Marker table. The marker table is displayed on the screen below the measurements table.
Note
Markers can be used to read the individual code power, symbol EVM (@ EVM) and type of code and can be activated in all the W-CDMA/HSDPA measurements.
