Path-Loss characteristics of urban wireless channels

Keith T. Herring, Jack W. Holloway, David H. Staelin, Daniel W. Bliss

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

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(P r/Pt) ≅ 10αlog10r ± 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 α ≅ 1.5±3.2β±0.27 for 2<α<5;β 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 α =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.

Original languageEnglish (US)
Article number5325795
Pages (from-to)171-177
Number of pages7
JournalIEEE Transactions on Antennas and Propagation
Volume58
Issue number1
DOIs
StatePublished - Jan 2010

Keywords

  • Attenuation
  • Communication channels
  • Data models
  • Fading channels
  • Microwave propagation
  • Multipath channels
  • Multiple-input multiple-output (MIMO) systems
  • Propagation
  • Statistics
  • Urban areas

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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