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Experimental analysis of the joint statistical properties of azimuth spread, delay spread, and shadow fading

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TLDR
All essential parameters required for the implementation of a simulation model considering the joint statistical properties of the local azimuth spread, the local delay spread, and shadow fading are provided.
Abstract
Empirical results characterizing the joint statistical properties of the local azimuth spread (AS), the local delay spread (DS), and the shadow (slow) fading component are presented. Measurement data from typical urban, bad urban, and suburban (SU) environments have been analyzed. It is found that a log-normal distribution accurately fits the distribution function of all the investigated parameters. The spatial autocorrelation function of both AS, DS, and shadow fading can be modeled with an exponential decay function. However, for SU environments the spatial autocorrelation function is better characterized by a composite of two exponential decaying functions. A positive cross correlation is found between the AS and the DS, while both parameters are negatively correlated with shadow fading. All essential parameters required for the implementation of a simulation model considering the joint statistical properties of the AS, DS, and shadow fading are provided.

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Digital Communications

Digital communications

J.E. Mazo
TL;DR: This month's guest columnist, Steve Bible, N7HPR, is completing a master’s degree in computer science at the Naval Postgraduate School in Monterey, California, and his research area closely follows his interest in amateur radio.
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Beamforming: a versatile approach to spatial filtering

TL;DR: An overview of beamforming from a signal-processing perspective is provided, with an emphasis on recent research.
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Empirical formula for propagation loss in land mobile radio services

TL;DR: An empirical formula for propagation loss is derived from Okumura's report in order to put his propagation prediction method to computational use.
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Characterization of Randomly Time-Variant Linear Channels

TL;DR: Several new canonical channel models are derived in this paper, some of which are dual to those of Kailath, and a model called the Quasi-WSSUS channel is presented to model the behavior of such channels.