An optimum model to estimate path losses for 400‐MHz‐band land mobile radio

Abstract

AbstractIt is difficult to estimate path loss for land mobile radio using a single path loss model such as the diffraction model or the Okumura model when mobile radio is utilized in a widespread area. Furthermore, high accuracy of the path loss estimation is needed when the radio system is digitized, because degradation of CNR due to interference worsens communications. In this paper, conventional path loss models, that is, the diffraction model, Okumura model, and two‐ray model, were evaluated using 400‐MHz land mobile radio field measurements, and a method for improving path loss estimation by using each of these conventional models selectively was proposed. The ratio of error between −10 dB and +10 dB for the method applying the correction factor derived from our field measurements was 71.41%, while the ratios for the conventional diffraction and Okumura models without any correction factors were 26.71% and 49.42%, respectively. © 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(3): 50–60, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10138