These first three groups of settings apply to all basic and advanced carriers. The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD carriers only.
Fading parameters are not available when the Waveform Generation Length parameter is set to >16 frames.
Choice: Off | On
Default: Off
Double-click or use the drop-down menu to turn the channel On or Off.
Channel State Off - The software simulates the signal at the base station transmitter antenna.
Channel State On - The software simulates the signal at the mobile station receiver antenna.
When the channel state is on, enable at least one path in the Multipath Configuration window. See Multi-Paths Setting (Static).
For multiple signal generator configurations, you must turn the Channel State on before you can change the number of BS antennas using the Total number of Antennas parameter in the Downlink Setup node. When the channel state is off, you must change the number of signal generators (for example, Quick Setup M x 1, M x 2, M x 4) to change the number of BS antennas.
Choice: Mobile | Static
Mobile is not available in this Signal Studio release.
Displays the number of base station antennas.
For multiple signal generator configurations, you must turn the Channel State on before you can change the number of BS antennas using the Total number of Antennas parameter in the Downlink Setup node. When the channel state is off, you must change the number of signal generators (for example, Quick Setup M x 1, M x 2, M x 4) to change the number of BS antennas.
Displays the number of mobile station antennas.
This value is set by the software to the number of signal generators configured in your physical or simulated hardware setup.
Click the 
icon to display the available channel parameters.
This parameter is active when Channel Type is set to Static.
Click on the button in
the cell to bring up the 
Multipath
Configuration
window, which enables you to add up to 20 paths with delay, power, and
phase impairments to simulate the multi-point reflection experienced in
a real-world multipath environment. The editing table was designed so
that you can edit and enable or disable individual paths as needed for
fine-tuning.
Note that there are tabs for each channel, for example, channel H10 for the channel from Tx Antenna 1 to Rx Antenna 0. Click the arrows to display additional tabs.
The following impairments can be made to each path:
Delay (0 to 20000 ms) - A reflected signal bounces off of one or more surfaces before reaching the receiver, resulting in a longer path than the line-of-sight signal. This delays the reflected signal relative to the line-of-sight signal.
Power (-100 to 0 dB) - Power Attenuation occurs with reflected signals as a result of the added distance they travel, compared to the line-of-site signal. Other factors may also contribute to signal power attenuation, such as the characteristics of the reflecting surface.
Phase (-360 to 360 Deg) - Signals become distorted as they reflect off of walls or other surfaces or wrap around corners, causing a shift in phase relative to the line-of-site signal. The user can adjust the phase of each multipoint signal to simulate such distortions.
When enabling a multipath configuration,
it is best to turn off RF
Blanking. Leaving Blanking on can result in partial blanking of any
delayed multipaths (see the figure below). To disable RF Blanking, click
the Instrument in the tree view
and set the RF Blanking to None. You can also turn off RF blanking on
the signal generator after the waveform file has been downloaded
.
