Path-Loss Characteristics of Urban Wireless Channels
Author(s)Herring, Keith T.; Holloway, Jack W.; Staelin, David H.; Bliss, Daniel W., Jr.
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Wireless channel data was collected in Cambridge, Massachusetts for diverse propagation environments over distances ranging from tens of meters to several kilometers using mobile 2.4-GHz transmitters and receivers. The 20-MHz bandwidth signals from eight individually movable van-top antennas were Nyquist sampled simultaneously with 12-bit accuracy. Although path-loss variance for any given link length within single residential/urban neighborhoods was large, single streets typically exhibited path-loss, L(dB)=-10 log10 (Pr/Pt) ?? 10?? log10 r + C, where P is the received or transmitted power, r the link-length, ?? the street-dependent path-loss coefficient, and C the loss incurred at street intersections. Measurements yielded ?? ?? 1.5 + 3.2?? ?? 0.27 for 2 < ?? < 5; ?? is the fraction of the street length having a building gap on either side. Experiments over links as short as 100 meters indicate a 10-dB advantage in estimating path loss for this model compared to optimal linear estimators based on link length alone. Measured air-to-ground links were well modeled by ?? = 2 for the elevated LOS path, and by stochastic log-normal attenuation for the ground-level scattering environment. These models permit path-loss predictions based on readily accessible environmental parameters, and lead to efficient nodal placement strategies for full urban coverage.
DepartmentLincoln Laboratory; Massachusetts Institute of Technology. Research Laboratory of Electronics
IEEE Transactions on Antennas and Propagation
Institute of Electrical and Electronics Engineers (IEEE)
Herring, K.T. et al. “Path-Loss Characteristics of Urban Wireless Channels.” IEEE Transactions on Antennas and Propagation 58.1 (2010): 171–177. © Copyright 2009 IEEE
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