CDMA demodulator measurements are selected by pressing the Measurements main menu key then the Demodulator submenu key. CDMA demodulator measurements include Code Domain Power (CDP), CDP table, and modulation summary. To demodulate cdmaOne and CDMA2000 1xRTT signals, connect the instrument to the base station following the setup instructions.
To make CDMA Demodulator measurements, connect the instrument to the base station and follow these setup instructions:
1. Press the Setup main menu key to open the Setup menu.
2. Press the PN Setup submenu key and choose No Trig, GPS, or External.
3. Press the PN Search Type submenu key and select Auto search or Manual search by toggling the submenu key.
Note
If Manual Search is selected, then press Manual PN Offset submenu key and enter the PN value manually.
4. Press Back to go to the previous (Setup) menu.
5. Press the Walsh Codes submenu key to choose 64 codes or 128 codes based on the transmitting signal.
6. Press the Measurement main menu key to open measurements menu.
7. Press the Demodulator submenu key to activate the Demodulator measurements menu.
CDP Setup
The CDP screen displays 64 Walsh Codes or 128 Walsh Codes. Pilot, Sync, Paging, and Quick Paging codes are displayed in a control channel table for easy viewing. Pilot power, channel power, Rho, channel carrier feedthrough, RMS phase error, Frequency Error, and Noise Floor measurements are displayed as numerical values.
From the Demodulator submenu, use the following procedure for CDP:
1. Press the CDP submenu key to display the Code Domain Power menus. This may require pressing the CDP submenu key a second time (Figure: Demodulator, CDP Setup).
2. Press the Zoom submenu key to activate zoom for 16, 32, or 64 codes.
3. Press the Zoom Start Index submenu key and enter the desired location manually.
4. Press CDP Units to select either Relative power (in dB) or Absolute power (in dBm).
Demodulator, CDP Setup
CDP Table View Setup
The CDP table view displays all of the active codes in a tabular format.
From the Demodulator measurement menu, use the following procedure for CDP Table view:
1. Press the CDP submenu key to display the Code Domain Power menus.
2. Press the Zoom submenu key to activate zoom for 16, 32, or 64 codes.
3. Press the Zoom StartIndex submenu key and enter the desired location manually.
4. Press CDP Units to select either Relative power (in dB) or Absolute power (in dBm).
