WCDMA Analyzer Measurement Guide : WCDMA Analyzer (Option 871) : WCDMA Demod Summary
 
WCDMA Demod Summary
WCDMA demod summary measurements are used for compliance testing of 3GPP WCDMA networks and can evaluate active antenna systems for dynamic physical layer attributes and received power levels of the transmitted signal.
WCDMA Demod Summary View
An example WCDMA Demod Summary measurement is shown in Figure: WCDMA FDD Demod Summary Measurement.
WCDMA FDD Demod Summary Measurement 
1. WCDMA Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the sweep setting, center frequency and reference level. See STATUS PANEL (WCDMA Demod Summary).
2. SYNC: This section consists of primary scrambling code, code group, frequency error and a sync status.
3. Frequency Error: This section shows the frequency error of all the measured signals. It is the difference between the measured carrier frequency and the specified carrier frequency. This measurement is only as accurate as the frequency reference that is used and is typically only useful with a good external frequency reference or GNSS (GPS). It consists of the following data:
• Count: The total number of frequency measurements included in the averaging measurement.
• Average: The average value of all frequency measurements made.
• Standard Deviation: The measure of the spread of frequency measurements. The standard deviation is the average difference of all measurements from the average frequency measurement. Typically 68% of all measurements will fall within the standard deviation value shown.
• Minimum: The single lowest frequency value measured.
• Maximum: The single highest frequency value measured.
WCDMA Summary Table View
The WCDMA Demod summary table displays the measured values of carrier frequency which is calculated as the sum of center frequency and frequency error, channel power, occupied bandwidth and scrambling code, as shown in Figure: WCDMA Summary Table View.
WCDMA Summary Table View
1. Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the center frequency, frequency error type, and band configuration. See STATUS PANEL (WCDMA Demod Summary).
2. SUMMARY TABLE: This field indicates the current beam summary page.
• Carrier Frequency: The sum of center frequency and frequency error.
• Frequency Error: Frequency error is the difference between the received center frequency and the specified center frequency. This is tied to external frequency reference accuracy and is typically useful only with a good external frequency reference. To view average frequency error, select AVERAGE from FREQ ERROR TYPE drop-down in the status panel.
• Channel Power: The total power transmitted within a specified frequency or channel bandwidth.
• Occupied BW: The bandwidth containing 99% of the total integrated power within the transmitted spectrum around the selected center frequency.
• Scrambling Code: Identifies and distinguishes the cells and sectors in a WCDMA network.
 
Note 
Option 871, WCDMA measurement is designed to support direct cable connection only, Over-the-Air (OTA) measurements are not supported.
 
STATUS PANEL (WCDMA Demod Summary)
The status panel illustrated in this section is unique to the current analyzer and to the particular measurement and view that is selected.
Figure: Status Panel with Minimized Icons (Demod Summary) shows the WCDMA status panel that covers the WCDMA demod summary measurements.
Status Panel with Minimized Icons (Demod Summary)
 
SWEEP: Toggles the current sweep setting between continuously or sweep once.
SWEEP ONCE
When sweep is set to single sweep, SWEEP ONCE updates the measurement display. Data continues to be captured in the background.
RESTART AVERAGING
Restarts the average frequency error value of the all the frequency measurements made.
FREQUENCY ERROR TYPE
Selects the frequency error type as either current or average. Shows the current frequency error value when CURRENT is selected. Shows the average of frequency error of all the measured channels. Note that this is only available in WCDMA summary table view.
REF LEVEL
Sets the reference level of the top graticule line in the selected units. If the reference level offset is not zero, OFFSET REF LEVEL is displayed at this location. Refer to Setting Amplitude.
CENTER FREQUENCY
Sets the center frequency of the measurement channel.
ATTEN LEVEL
Manually sets the attenuation level. This feature is not available when auto range or auto attenuation is enabled.
PRE AMP
Turns the low-noise front-end preamplifier on or off. To ensure accurate measurement results, the largest signal into the instrument input when the preamplifier is turned on should be less than –40 dBm. The preamplifier cannot be turned on if auto attenuation is on and the reference level is above –40 dBm.
FREQ REFERENCE
Indicates the current frequency reference source of Internal, External, or GNSS (GPS) Hi Accuracy (requires GPS). The instrument automatically selects the frequency reference in the following order of priority: external, GNSS (GPS), then the internal time base.