Alberto S. Banacia, Rosana J. Ferolin
The IEEE 802.11af standard is a wireless local area network that operates in the television white space, requiring it to avoid inducing damaging interference to licensed users such as incumbent digital and television services. To achieve this, precise tools for estimating path loss are essential to prevent both underestimation and overestimation, which could either l imit the coverage of White Space Devices (WSDs) or fail to adequately shield primary or licensed users from unwanted emissions produced by secondary WSDs. This paper examines and compares the performance of various models for path loss, including Free Space Path Loss (FSPL), relevant portions of Recommendation ITU-R P.1411-11, and the linear and logarithmic regression models, against field measurement data to identify the most suitable path loss estimation model. The findings indicate that the logarithmic regression model exhibits the Root-Mean-Square Error (RMSE) that has the best performance, with a mean estimation error of 5 dB across all experimental locations where measurements were conducted. Additionally, the study suggests that the path loss model for free space can effectively provide a conservative path loss estimate for all sites, with an average overestimation of 18 dB, thereby ensuring adequate protection for primary users against potential interference from secondary users. © 2024 Seventh Sense Research Group®.
Department of Electrical and Electronics Engineering, University of San Carlos, Cebu City, Philippines; School of Engineering, University of San Carlos, Cebu City, Philippines
