When you use a standard channel model in a MIMO configuration, the firmware automatically populates the antenna characteristics as specified in the standard. However, the PXB allows you to customize antenna characteristics such as antenna pattern, and antenna spacing to simulate a wide variety of operating environments.
.Note: All of the parameters listed below are not displayed simultaneously. Click a parameter below to view any related dependencies
| Rx Antenna Setup | Tx Antenna Setup |
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Tx Antennas |
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Rx Antennas |
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| Rx Probes | |
This is a read-only parameter.
This is a read-only parameter.
Displays the antenna geometry for the receiver antennas. For standard models, this parameter is set by the standard and cannot be edited.
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Uniform Linear Array |
Displayed as the default antenna type for standard configurations |
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Beamforming |
Displayed if the correlation type is beamforming in a 2x4 or 4x2 WiMAX configuration. |
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User Specified |
Displayed when any standard antenna geometry is changed. |
Choices: Omni-Directional, Three Sector, Six Sector, Uncorrelated, User Specified
Selects the radiation pattern of the antenna. The antenna pattern selection depends on factors such as: the propagation environment (number of scatters and location), as well as the performance attributes of interest (peak rate, improved coverage, maximum capacity). For standard models, this parameter is set by the standard and cannot be edited.
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Omni-Directional |
Selects an omni-directional antenna pattern that radiates the signal outward equally in all directions (360 degrees). Omni-directional antennas are typically used to cover large areas where the exact location of the receiver is unknown. One disadvantage is that an omni-directional antenna picks up much of the noise surrounding it and distributes the transmit power over all directions making for a weaker signal. |
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Three Sector |
Sets the radiation pattern of the antennas to use three 120o sectors to direct the transmitted energy in a certain direction. Sectorized antennas are employed to reduce co-channel interference over a restricted range and increase the possible reuse of a frequency channel by reducing potential interference. |
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Six Sector
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Sets the radiation pattern of the antennas to use six 60o sectors to direct the transmitted energy in a certain direction. Sectorized antennas are employed to reduce co-channel interference over a restricted range and increase the possible reuse of a frequency channel by reducing potential interference. |
| Uncorrelated |
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup. Sets the antenna to an uncorrelated state to remove the influence of the antenna on channel capacity. |
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User Specified
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Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup. Sets the radiation pattern of the antennas according to antenna parameters that you specify, including: Rotation Angle, Reference, Slice Elevation Angle, and Use Shared Phase Center. |
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
Sets the current position of the antenna array relative to the zero angle (boresight) established during the pattern measurement.
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
Sets the rotation angle of the array to be used for power reference during power calibration (usually the angle of maximum gain).
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
Sets the 2D projection onto the azimuth plane, of a slice through the origin of a 3D pattern, taken at this angle relative to the azimuth plane
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
If the antenna pattern shares the same phase center (reference point), set this parameter to On. The phase difference already includes the antenna distance influence on pattern phase and is therefore not considered during the correlation calculation.
If the antenna pattern does not share the same phase center (reference point), set the parameter to Off. The phase difference caused by the antenna elements position distance must be considered during the correlation calculation.
Dependency: This parameter is only available when a MIMO OTA Test > Ring of Probes Channel Model is selected and the Correlation Source is From Custom Antenna Setup.
This setting specifies whether the antenna probes in a MIMO OTA multiprobe test are configured in a single or double cluster.
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Single Polarization |
Each antenna position has a single antenna probe. |
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Dual Polarization |
Each antenna position has 2 antenna probes. |
Dependency: This parameter is only available when a MIMO OTA Test > Ring of Probes Channel Model is selected and the Correlation Source is From Custom Antenna Setup.
This setting specifies the positions of the antenna probes for MIMO OTA multiprobe test.
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Automatic Single Cluster |
The PXB will calculate optimal positions for the probes. Choosing this setting will cause Probe Polarization to be set to Single Polarization. |
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Full Circle |
Only available when the PXB is in an 8 Rx antenna configuration. Sets the 8 probes to be positioned in a circle. Choosing it will cause Probe Polarization to be set to Single Polarization. |
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Custom |
This setting allows the user to specify probe positions. |
Rx Antenna
This is a read-only parameter.
Displays the polarization and spacing for the antenna elements. For standard
models, these parameters are set by the standard and cannot be edited.
If the correlation source is From Antenna,
the antenna coordinates can be edited.
Polarization
This is a read-only parameter.
Displays the 
angle (degree)
of orientation
that aligns the antenna with respect to the direction of the waveform
propagation and relative to the earth's surface. (The polarization of
an antenna is the polarization of the electromagnetic wave radiated by
the antenna along a vector originating at the antenna and pointed along
the primary direction of propagation.)
X Coordinate
Range: ± 10 times the number of receive antennas * λ
Default Value: 0.00; evenly spaced by 0.5 λ starting at 0.
Resolution: 0.01
Sets the horizontal spacing of the antenna at the mobile station which is normalized by the carrier wavelength.
Y Coordinate
Range: ± 10 times the number of receive antennas * λ
Default Value: 0.00; evenly spaced by 0.5 λ starting at 0.
Resolution: 0.01
Sets the vertical spacing of the antenna at the mobile station which is normalized by the carrier wavelength.
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup, and the Antenna Pattern is User Specified.
Selects the antenna pattern file to be used to set the antenna gain through incremental angles of orientation. The file format for each user-defined antenna file consists of two parts: a parameter description section and a data section.
For configurations containing multiple antennas, each antenna’s pattern must be saved in a separate ascii text file. The antenna gain must always be complex when used with the PXB, expressed either in magnitude, phase format or real, imaginary format. (View a sample antenna file in real-imaginary format.)
Range: 0-360°
Default Value:((i-1)*360/n)°, for the ith probe out of n total probes.
Dependency: This parameter is only available when a MIMO OTA Test > Ring of Probes Channel Model is selected, Correlation Source is From Custom Antenna Setup, and Probe Constellation is Custom.
Sets where a probe is positioned relative to a 0 reference position in the chamber. Depending on the Antenna Probe Constellation setting, these values may be read-only or user-definable. There are n position settings, one for each Rx antenna, or n/2 settings when Probe Polarization is set to Dual Polarization.
This is a read-only parameter.
Displays the number of transmit antennas in the MIMO configuration.
This is a read-only parameter.
Displays the antenna geometry for the transmit antennas.
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Uniform Linear Array |
Displayed as the default antenna type for standard configurations. |
|
Beamforming |
Displayed if the correlation type is selected as beamforming in a 2x4 or 4x2 WiMAX configuration. |
|
User Specified |
Displayed when any standard antenna geometry is changed. |
Choices: Omni-Directional, Three Sector, Six Sector, Uncorrelated, User Specified
Selects the radiation pattern of the antenna. The antenna pattern selection depends on factors such as: the propagation environment (number of scatters and location), as well as the performance attributes of interest (peak rate, improved coverage, maximum capacity). For standard models, this parameter is set by the standard and cannot be edited.
|
Omni-Directional |
Selects an omni-directional antenna pattern that radiates the signal outward equally in all directions (360 degrees). Omni-directional antennas are typically used to cover large areas where the exact location of the receiver is unknown. One disadvantage is that an omni-directional antenna picks up much of the noise surrounding it and distributes the transmit power over all directions making for a weaker signal. |
|
Three Sector |
Sets the radiation pattern of the antennas to use three 120o sectors to direct the transmitted energy in a certain direction. Sectorized antennas are employed to reduce co-channel interference over a restricted range and increase the possible reuse of a frequency channel by reducing potential interference. |
|
Six Sector
|
Sets the radiation pattern of the antennas to use six 60o sectors to direct the transmitted energy in a certain direction. Sectorized antennas are employed to reduce co-channel interference over a restricted range and increase the possible reuse of a frequency channel by reducing potential interference. |
| Uncorrelated |
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup. Sets the antenna to an uncorrelated state to remove the influence of the antenna on channel capacity. |
| User Specified |
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup. Sets the radiation pattern of the antennas according to antenna parameters that you specify: Rotation Angle, Reference, Slice Elevation Angle, and Use Shared Phase Center. |
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
Sets the current position of the antenna array relative to the zero angle (boresight) established during the pattern measurement.
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
Sets the rotation angle of the array to be used for power reference during power calibration (usually the angle of maximum gain).
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
Sets the 2D projection onto the azimuth plane, of a slice through the origin of a 3D pattern, taken at this angle relative to the azimuth plane
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup and the Antenna Pattern is User Specified.
If the antenna pattern shares the same phase center (reference point), set this parameter to On. The phase difference already includes the antenna distance influence on pattern phase and is therefore not considered during the correlation calculation.
If the antenna pattern does not share the same phase center (reference point), set the parameter to Off. The phase difference caused by the antenna elements position distance must be considered during the correlation calculation.
This is a read-only parameter.
Displays the polarization and spacing for the antenna elements. For standard
models, these parameters are set by the standard and cannot be edited.
If the correlation source is From Antenna, the antenna coordinates can
be edited.
Polarization
This is a read-only parameter.
Displays the angle (degree) of orientation
that aligns the antenna with respect to the direction of the waveform
propagation and relative to the earth's surface. (The polarization of
an antenna is the polarization of the electromagnetic wave radiated by
the antenna along a vector originating at the antenna and pointed along
the primary direction of propagation.)
X Coordinate
Range: ± 10 times the number of transmit
antennas * λ
Default Value: 0.00 λ ; evenly spaced by 4 λ starting at 0.
Resolution: 0.01 λ
Sets the horizontal spacing of the antenna at the base station which is normalized by the carrier wavelength.
Y
Coordinate
Range: ± 10 times the number of transmit
antennas * λ
Default Value: 0.00; evenly spaced by 4 λ starting at 0.0
Resolution: 0.01 λ
Sets the vertical spacing of the antenna at the base station which is normalized by the carrier wavelength.
Dependency: This parameter is only available when the Correlation Source is From Custom Antenna Setup, and the Antenna Pattern is User Specified..
Selects the antenna pattern file to be used to set the antenna gain through incremental angles of orientation. The file format for each user-defined antenna file consists of two parts: a parameter description section and a data section.
For configurations containing multiple antennas, each antenna’s pattern must be saved in a separate ascii text file. The antenna gain must always be complex when used with the PXB, expressed either in magnitude, phase format or real, imaginary format. (View a sample antenna file in real-imaginary format.)
