# Behind the Door: Practical Parameterization of Propagation Parameters for IEEE 802.11 ad Use Cases
## 5 Conclusions and Future Work  
Empirical results are always contingent on the geometry, measurement setup, and system configuration. That is why all empirical campaigns contribute to the literature by computing channel parameters in different scenarios. Specifically, in this work, we discuss several fundamental propagation parameters computed from empirical data in a typical and relevant use case of IEEE 802.11 ad networks that has only been partially covered in the literature. These parameters are relevant for tuning simulators or calibrating computational analyses of wireless networks by incorporating physical layer impairments. This allows the design of cross-layer evaluations, testing the performance of upper-layer protocols for a non-ideal physical layer.  
As a further contribution, this article presents empirical results for the design of IEEE 802.11 ad networks: an indoor high-speed wireless local area network operating at 60 GHz. We have demonstrated that, with the angular distribution of the received power, the link is stable, and there is more than one useful lobe if no significant movement exists along the link. Although moving pedestrians can cause substantial power losses, there are still a significant number of lobes to combine in angular combiners (MRC, SC, EGC) or in a beamformer to enhance link performance. We also note that small pointing errors can bring the STA to the noise floor. Moreover, we did not observe significant changes in the angular profiles of the received power at the STA when people worked at their desks (inside offices, moving freely, without walking). For the tested scenario, \"hiding\" the STA antenna behind a door (when transmitting from the aisle) showed significant losses (up to 40 dB) even if the link length did not change significantly.  
Regarding future work, we intend to extend these results to the outdoor-indoor case, where an outdoor base station provides service to indoor users. This will be representative of the operation of fifth-generation cellular systems, where the 60 GHz band is fundamental for high-speed data transmissions under very low latency constraints.  
Conceptualization, L.A., E.C. and A.A.; methodology, L.A., E.C. and A.A.; software, L.A., E.C. and A.A.; validation, L.A., E.C. and A.A.; formal analysis, L.A., E.C. and A.A.;  
Figure 6: Positions tested to estimate the losses after “hiding” from the LOS with corresponding angular profiles of received power (dBm unit) in the STA for the LOS (blue) and NLOS cases (magenta): (**A**) Pos. A, (**B**) Pos. B, and (**C**) Pos. C.  
investigation, L.A., E.C. and A.A.; resources, L.A., E.C. and A.A.; data curation, L.A., E.C. and A.A.; writing--original draft preparation, L.A., E.C. and A.A.; writing--review and editing, D.D. and P.P.J.; visualization, L.A., E.C. and A.A.A.; supervision, L.A.; project administration, L.A.; funding acquisition, L.A. All authors have read and agreed to the published version of the manuscript.  
This work was partially supported by ANID through the grant Fondecyt/Postdoc 3140045, and it was also partially funded by the Proyecto Conicyt/Basal Advanced Center for Electrical and Electronic Engineering (AC3E, Proyecto Basal FB0008), ANID FONDECYT Iniciacion 11240799, ANID FONDECYT Regular 1211132, and SENESCYT \"Convocatoria abierta 2014-primera fase (Acta CIBAE-023-2014)\".  
Not applicable  
The raw data supporting the conclusions of this article will be made available by the authors on request.  
The authors would also like to express their gratitude to the CYTED AgIoT Project (520 rt0011) and the CORFO CoTH2O Consortium for their generous support.  
The authors declare no conflicts of interest.