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Session 2D: Test and Measurement - Part 1
Azimuth Systems, Brian Nutter, Carl B. Dietrich, Channel Emulator, cognitive radio, Dan McLane, DSP, Edward Wolfe, Elliot Briggs, Erik Org, Field to Lab Testing, FPGA, Garrett Vanhoy, Harris Corporation, Innovative Integration, Inc., LTE Testing, Majid Manteghi, Multi-path, Pearson & Assessment & Information Group, Psychometric Approaches, Real World Test, Real-time, Software Defined Radio, Texas Tech University, University of Arizona, Virginia Tech, Volodymyr Podosinov
Regency D => Tue, Nov 29, 2011 (03:15 PM - 05:15 PM)
Author (A - C):
Author (D - I):
Author (J - N):
Majid Manteghi, Dan McLane, Brian Nutter
Author (O - S):
Erik Org, Volodymyr Podosinov
Author (T - Z) :
Garrett Vanhoy, Edward Wolfe
Session 2D: Test and Measurement - Part 1
15:15 Using Field to Lab Testing to Connect Design, Manufacture and Deployment of SDR and CR with Real World Test
Author: Erik Org (Azimuth Systems, USA)
Abstract - The ultimate test for a developer or test engineer is one that accurately captures the user experience in a controlled, repeatable, and cost-effective way. The benefit of such a test is that devices and systems will work as expected when delivered to the end users. The typical solution -- drive testing -- can be very expensive and time consuming. Test solutions that bring the real world into the test lab with effective and easy-to-use implementations are precisely what are needed to rapidly assess and benchmark the performance of innovative technologies such as software defined radio (SDR) and cognitive radio (CR). Often, however, standard channel models are not sufficient to accurately benchmark device performance before a device is deployed to the field. Situations that arise in the field, such as "Rising Pilot" where a device under test (DUT) is briefly exposed to high power pilot from an adjacent base station because of the urban landscape, can result in unintended consequences. The ability to identify, map and playback these scenarios enables test engineers to more easily evaluate DUT performance over a wide range of unique RF conditions.
15:39 A Real-Time Multi-Path Fading Channel Emulator Developed for LTE Testing
Authors: Elliot Briggs (Texas Tech University, USA); Brian Nutter (Texas Tech University, USA); Dan McLane (Innovative Integration, Inc., USA)
Abstract - When developing a communications system, it is useful to perform tests in channel environments in which the system is intended to operate. Many modern mobile communications systems must be tolerant to high mobility and fast-changing channel conditions, which makes field testing difficult. In order to test specific channel conditions, or repeat time-varying sequences that occur in the channel environment, it is useful to have a programmable system that can emulate the conditions found in an actual time-varying radio channels in real-time. In the 3GPP long term evolution (LTE) standard, 3 channel power-delay profiles have been defined for conformance testing, each with varying mobility. An FPGA-based channel emulator has been developed that conforms to the LTE models, yet is flexible enough to allow the user to define their own model if desired. The channel emulator is built around flexibility, allowing the user to define both the power-delay profile as well as the maximum Doppler frequency with high resolution.
16:03 A Hybrid DSP and FPGA System for Software Defined Radio Applications
Authors: Volodymyr Podosinov (Virginia Tech, USA); Majid Manteghi (Virginia Tech, USA)
Abstract - Software defined radio is vastly researched field right now, due to the fact that given one type of hardware, multiple radio personalities can be implemented. There are a few commercial and government companies who already use the concept of software defined radio in their products. Researches use software defined radio to study the field of cognitive radio, and to research new algorithms. Currently, there are a few options on the market for software defined radio for research. USRP (Universal Serial Radio Peripheral) from Ettus Research LLC is one of them. The platform costs $700 and provides analog front end, with FPGA inside for some filtering and up/down-conversion. Ettus Research recently introduced USRP2 that costs $1400 and provides more capabilities. Rice University makes WARP platform based around FPGA, but it costs $8500. This research introduces a new platform for software defined radio research that is based around DSP and FPGA, and allows for quick interchange of RF front ends, similar to USRP platform. Compared to USRP platform, the platform is embedded and does not require PC to generate or receive data.
16:27 Cognitive Radio Testing Using Psychometric Approaches (BEST of R&D TRACK)
Authors: Carl B. Dietrich (Virginia Tech & Wireless @ Virginia Tech, USA); Edward Wolfe (Pearson & Assessment & Information Group, USA); Garrett Vanhoy (University of Arizona, USA)
Abstract - Cognitive radios promise efficient spectrum use, but their flexibility complicates testing. We propose to improve cognitive radio development and testing using approaches developed for efficiently measuring and testing human cognitive characteristics.Cognitive radio testing requirements, applicable psychometric approaches, and a planned software-controlled cognitive radio testbed are described.