* The Correlation tab is not displayed for 1 Channel configurations.
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Run-time Adjustment of Fading Parameters For 1 Channel Generate and Fade or 1 Channel Fade (ext in) configurations:
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Displayed with the DVB-H, Mobile SFN, <echo type> profiles.
Displayed with the W-CDMA Birth-Death profile.
Displayed for each Fader with the LTE High Speed Train profile selection.
High (Hex)
Middle (Hex)
Low (Hex)
Choices: See table
Selects a default or standard-based fading model. The standard models cover SISO propagation environments that allow you to test whether your device meets the performance requirements as defined by the respective standard. The firmware automatically populates the path configurations for the selected standard model.
Default: On
Choices: On, Pass Through, Off
Turns fading on, off, or allows the faded signal to pass through a fader block.
On
Applies fading to the signal on the selected fader block in the configuration.
Pass Through
Passes the signal through the fader block without applying fading. This allows easier synchronization between the device-under-test (DUT) and the PXB with the same fader backoff as with the fader enabled.
Off
Turns the fader off; no signal is transmitted through the selected fader block.
Fader
Carrier Frequency
Default: 2.4 GHz
Range: 1 to 44 GHz
Sets the carrier frequency to be used for Doppler effects in the fading simulations. The carrier frequency is coupled to the Doppler frequency or the vehicle speed as selected under Carrier Frequency Coupling in the Fader Path Setup view. The carrier frequency entered here is not automatically coupled to any external instrument.
Dependency: Displayed only when a DVB/DVB-H/Mobile
SFN/<echo type> channel model is selected.
Default: 0 s
Range: 0 s to 1 ms
Sets the additional time delay (in seconds) for the DVB fading paths that are part of the echo signal. Use this command only after changing the Channel Model to DVB and selecting the Mobile SFN scenario echo type.
Dependency: Displayed only when a DVB/DVB-H/Mobile
SFN/<echo type> channel model is selected.
Default: 0 dB
Range: 0 dB to 20 dB
Sets the additional loss for the DVB fading paths that are part of the Weak long Echo signal. Use this setting only after changing the Channel Model to DVB and selecting the Mobile SFN scenario echo type.
Choices: On, Off
Turns dynamic fading on or off. With dynamic fading on, the dynamic fading feature will be started the next time the waveform is played. (Dynamic fading is not available for the following profiles: W-CDMA Birth Death, W-CDMA Moving Propagation, or High Speed Train).
Dynamic fadinguses data that you define to dynamically change the relative path loss, path delay, and UE speed for up to 24 paths for each fading channel. The data for dynamic fading is entered from a dynamic fading scenario file.
This cell is only visible when dynamic fading is enabled.
Accesses a window from which you can browse
to select a previously saved file that contains the fading scenarios to
use for dynamic fading.
A Microsoft Excel spreadsheet template is provided to create the dynamic fading scenario file. The Agilent Dynamic Fading Template can be found at the following places:
On the PXB Desktop
In the C:\<Program Files for Win XP><Program Files (x86) for Win 7>\Agilent\PXB\Infrastructure\Applications\Fading directory
On the internet at http://www.agilent.com/find/PXB under the Technical Support tab
Refer to Dynamic Fading for complete instructions on how to create the dynamic fading scenario file.
Dependency: Displayed only when a
W-CDMA BS or W-CDMA MS Birth-Death profile is the selected Channel Model.
Minimum Delay
Range: –25 to –0.1 ms
Default: –5.0 ms
Sets the minimum birth-death path delay when you select a Birth-Death delay profile for W-CDMA BS/MS. Although the minimum delay property is a negative value, the delay bins are actually shifted to the positive while maintaining the same bin spacing.
Maximum Delay
Range: 0.1 to 25 ms
Default: 5.0 ms
Sets the maximum birth-death path delay when you select a Birth-Death delay profile for W-CDMA BS/MS.
Range: 1 to 5 ms
Default: 1 ms
Sets the minimum step size of the random hops when you select a Birth-Death delay profile for W-CDMA BS/MS.
Range: 0.1 to 1 s
Default: 0.191 s
Sets the duration for each birth-death state when you select a Birth-Death delay profile for W-CDMA BS/MS.
Dependency: Displayed only when LTE High Speed Train is selected as the Channel Model
Default:
Tunnel: 150 m; Open Space: 500 m
Range: 10 m to 100 km
Sets the initial distance (Ds/2) that the mobile must travel before passing the base station (assuming that the initial distance is much larger than Dmin) when using the LTE high speed train channel model.
Range: 0 to 289 – 1
Sets the random number generation seed of the fading channel. If it is set to zero, the generated fading will be different for each playback to provide randomness for each test. To reproduce the same fading environment for the same configuration as the last time it was played, use the same seed value (other than 0) each time.
You can enter the entire 89-bit sequence directly into the random seed cell or use the high, medium, and low cells to designate the number in three segments for easier data entry.
Specifies the upper bits (0x0 to 0x1FFFFFF).
Specifies the middle bits (0x0 to 0xFFFFFFFF).
Specifies the lowest bits (0x0 to 0xFFFFFFFF).
