Using IF-scale delays to emulate the effects of site-specific multipath in a digital wireless channel emulator

Authors:
Jason Matusiak;Richard Graham;Keith Taylor;Eric Anderson;Brenton Walker
Affiliations:
Gardetto Engineering, Hanover, MD, USA;EurekaSound LLC, Sewickley, PA, USA;University of Maryland - College Park, College Park, MD, USA;Carnegie Mellon University, Pittsburgh, PA, USA;Laboratory for Telecommunications Sciences/US Dept of Defense, College Park, MD, USA
Venue:
Proceedings of the 8th ACM international workshop on Wireless network testbeds, experimental evaluation & characterization
Year:
2013

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Abstract

Laboratory-based wireless testbeds are essential for performing repeatable experiments with experimental protocols and devices. Several many-to-many wireless emulators have been proposed and built, but existing systems still rely on simplified channel models, such as free-space path loss, or general stochastic fading models. We have begun using site-specific channel modeling software to drive experiments. In this paper we describe our prototype digital channel emulator with multiple discrete-time taps, and several experiments using a site-specific, 3D ray-tracing channel model, controlling and highlighting the effects of RF multipath. We describe and evaluate a technique for emulating RF-scale interference with discrete delay taps with a resolution on the timescale of IF.