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Matthias Goelke

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About Matthias Goelke

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  1. The prediction results of the DPM model are basically impacted by the defined propagation exponents (before and after breakpoint, both LOS and OLOS) and the defined value for the interaction loss (e.g. 13 dB). So I it is recommended to tune these values (propagation exponents and interaction loss) first instead of modifying the building materials. In ProMan there is the possibility to import the measurements, assign the measurement files to a specific Tx antenna and then consider the measurement files for an auto-calibration of the DPM model parameters. Please have a look in the ProMan manual for further details (search for “calibration”).
  2. How can the WinProp DPM model be adapted to measurements?
  3. The computation of the radio coverage in WinProp can be done in a first step for each RF system (typically each RF system use its own frequency band). Based on assumptions how much power will be radiated from the Tx antennas into the other frequency bands (and how the reception of the other frequency bands will be attenuated on the receiving end) in terms of an adjacent channel leakage ratio (ACLR) it is then possible to post-process these radio coverage plots for the individual RF systems to determine the interference situation. In a WinProp network planning project (e.g. for LTE or WLAN) generally only the co-channel interference is computed, while the adjacent channel interference is neglected. This means for the determination of the interference on a specific frequency band (RF system) a project with the Tx antennas for all the considered RF systems can be defined and then the Tx power for the Tx antennas of the other RF systems can be reduced by the above mentioned ACLR (which needs to be derived outside of WinProp).
  4. How WinProp can be used for the interference analysis between different RF systems?
  5. With PRO-V the WallMan tool allows to define time-variant objects (group of polygons and trajectories of movement including speed profile) and then the corresponding object data can be saved for various time steps in individual databases (i.e. one idb file per time step). In the API it is then possible to define one database (i.e. one idb file) for the simulation, based on this approach the WinProp API function can be called subsequently with different idb files for the multiple time steps. So the main benefit of adding the PRO-V module is in the additional WallMan functionalities (WallMan does not run under the API, i.e. the additional functionalities are in the WallMan GUI version), while for running the predictions there will be no additional feature, but the WinProp_Predict function from the API can be called for each time step with a separate idb file.
  6. Can time-variant objects be considered in the WinProp API?
  7. For the limitation of the prediction area in ProMan after the simulation there is the following possibility: For this purpose you can define a mask file, just by copying one of the result files, rename the file to e.g. mask.mas, load it in ProMan and then draw with the Edit Data button (pencil button) a rectangle over the total result and setting all values to 1 (value can be changed with the Change Edit-Value button, i.e. the 123 button) and finally set the pixels outside the building to 0 as shown in the following figure. In order to see what you have drawn you need to adapt the scale as shown below. The corresponding mask file can be used to mask every result file which is displayed in ProMan via Edit => Mask Data => Mask Result File (0/1). Based on this e.g. the outdoor pixels will be set to not computed (N.C.) and only the pixels inside indoor will be considered (also for the statistical evaluation like CDF).
  8. How can the prediction area in ProMan be limited to a certain region (e.g. shape of a building)?
  9. The reported error (d3dx10_43.dll is missing) occurs if the required DirectX DLLs are missing. Please run setup.exe for the correct installation of WinProp. However the web installer for DirectX will not work without internet connection. WinProp requires the installation of DirectX 9. The driver can be downloaded from the following link and then copied to the corresponding PC: https://www.microsoft.com/en-US/download/confirmation.aspx?id=34429
  10. The program can’t start because d3dx10_43.dll is missing. What do I need to do?
  11. In HyperView (Postprocessor) change numeric format from "Auto" to "Engineering". This allows to display results with up to 12 digits.
  12. How to output displacements with more digits than the default 5 ? (I found this question in another forum and thought it may be of general interest)
  13. The impact of the MIMO interference on the number of streams is basically visible in case of distributed MIMO systems. In this case the MIMO antenna elements are located on different positions (e.g. inside other rooms) and thus experience different channel conditions, i.e. the power received from the different Tx antenna elements is no longer the same at a certain location. Then due to the assumed MIMO interference model (with e.g. 20 dB relative contribution of interference) it happens that some streams can be no longer received (due to the reduced SNIR) and thus the number of streams is reduced. In case of co-located MIMO systems the channel conditions for the different Tx antenna elements are almost the same. Therefore you don’t experience a degradation of the number of streams due to the assumed MIMO interference, as in this case all the streams will be affected in the same way. Thus you have either all the streams transmitted or none at all.
  14. What is the difference between interleaved and co-located MIMO?
  15. In ProMan only the SISO channel is computed regarding the wave propagation. Thus for the MIMO network planning of co-located MIMO systems in ProMan it is assumed that there is sufficient distance between the antenna elements to avoid performance degradation. Typically in indoor scenarios (especially in closed buildings) there are always sufficient multipaths for allowing MIMO spatial multiplexing. The SISO channel information computed in ProMan can be saved in str files. The str files can be postprocessed in the MIMOMan tool for getting the MIMO channel matrix (and also the MIMO channel capacity) by considering specific geometries of the MIMO antenna elements on both transmitting and receiving end. Based on this approach the phases of the rays computed and saved in the str file will be adapted according to the individual location of the MIMO antenna element. The MIMO channel matrix computed in MIMOMan considers then the correlation between the antenna elements. Regarding the power definition for the individual antenna elements (MIMO streams) in ProMan, please define the Tx power for each antenna element, so that the power sum is below the device EIRP.
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