Last Updated: August 29, 2007
This topic describes the Occupied Bandwidth measurement. Occupied Bandwidth is a measurement in the Dedicated Physical Channel measurement suite.
As defined by 3GPP TS 34.121 section 5.8, Occupied Bandwidth (OBW) is the bandwidth containing 99% of the total integrated power of the transmitted spectrum, centered on the assigned channel frequency. The test set allows the percentage of total integrated power to be adjusted from 70.0 to 99.0%.
During this measurement, a Gaussian filter with a resolution bandwidth (RBW) of 30 kHz or less is used to measure the distribution of the power spectrum in a measurement bandwidth greater or equal to 10MHz.
First, when the total integrated power is set to 99%, the total power found in the measured frequency range is calculated. Then, starting at the lowest frequency in the range and moving upward, the power distributed in each frequency is summed until this sum is 0.5% of the total power. This gives the lower frequency value. Next, starting at the highest frequency in the range and moving downward, the power distributed in each frequency is summed until 0.5% of the total power is reached. This gives the upper frequency value. The bandwidth between the 0.5% power frequency points is the occupied bandwidth.
Occupied Bandwidth is a measurement in the Dedicated Physical Channel measurement suite. See Dedicated Physical Channel Measurement Suite Measurement Parameters for details of the parameters that apply to measurements in the suite.
Occupied Bandwidth is a measurement in the Dedicated Physical Channel measurement suite. See Dedicated Physical Channel Measurement Suite Measurement Limits for details of the limits parameters that apply to measurements in the suite.
This result provides the integrity indicator for the Dedicated Physical Channel measurement suite. Normal indicates that the measurement suite completed successfully without error and the result is accurate. For details of other integrity indicators, see Measurement Integrity Indicator.
SCPI command: FETCh:WDPChannel:INTegrity?
The result indicates whether the Occupied Bandwidth measurement passes or fails.
SCPI commands: FETCh:WDPChannel:OBWidth[:PARTial]?, FETCh:WDPChannel:OBWidth:ALL?
This result provides the bandwidth in MHz that contains the specified percentage of the total integrated power of the transmitted spectrum, centered on the assigned channel frequency. The Occupied Bandwidth is the Upper Band Frequency minus the Lower Band Frequency. If the Multi-Measurement Count is enabled, the average Occupied Bandwith result is returned, otherwise a single measurement result is returned.
SCPI command: FETCh:WDPChannel:OBWidth[:PARTial]?, FETCh:WDPChannel:OBWidth:ALL?
This result provides the minimum occupied bandwidth in MHz measured during a multi-measurement. This result is not displayed on the front panel when the Multi-Measurement Count is Off.
SCPI command: FETCh:WDPChannel:OBWidth:ALL?
This result provides the maximum occupied bandwidth in MHz measured during a multi-measurement. This result is not displayed on the front panel when the Multi-Measurement Count is Off.
SCPI command: FETCh:WDPChannel:OBWidth:ALL?
This result provides the standard deviation of the occupied bandwidth in MHz measured during a multi-measurement. This result is not displayed on the front panel when the Multi-Measurement Count is Off.
SCPI command: FETCh:WDPChannel:OBWidth:ALL?
This result provides the highest frequency in MHz in the measured frequency range. Only averaged results are returned when the Multi-Measurement Count is enabled. If the Normalize parameter is enabled, results are Normalized to the expected frequency. Otherwise, absolute frequency results are returned.
SCPI command: FETCh:WDPChannel:OBWidth:ALL?
This result provides the lowest frequency in MHz in the measured frequency range. Only averaged results are returned when the Multi-Measurement Count is enabled. If the Normalize parameter is enabled, results are Normalized to the expected frequency. Otherwise, absolute frequency results are returned.
SCPI command: FETCh:WDPChannel:OBWidth:ALL?
This result provides the center frequency in MHz in the measured frequency range. This result is the mean of the upper and lower band frequencies. Only averaged results are returned when the Multi-Measurement Count is enabled. If the Normalize parameter is enabled, results are Normalized to the expected frequency. Otherwise, absolute frequency results are returned.
SCPI command: FETCh:WDPChannel:OBWidth:ALL?
Occupied Bandwidth is a measurement in the Dedicated Physical Channel measurement suite. See Dedicated Physical Channel Input Signal Requirements for details of the input signal requirements that apply to all measurements in the suite.