@article{maeng_ozdemir_guvenc_sichitiu_dutta_mushi_2023, title={AERIQ: SDR-Based LTE I/Q Measurement and Analysis Framework for Air-to-Ground Propagation Modeling}, ISSN={["1095-323X"]}, DOI={10.1109/AERO55745.2023.10115787}, abstractNote={In this paper, we introduce AERIQ: a software-defined radio (SDR) based I/Q measurement and analysis framework for wireless signals for aerial experimentation. AERIQ is integrated into controllable aerial vehicles, it is flexible, repeatable, and provides raw I/Q samples for post-processing the data to extract various key parameters of interest (KPIs) over a 3D volume. Using SDRs, we collect I/Q data with unmanned aerial vehicles (UAVs) flying at various altitudes in a radio dynamic zone (RDZ) like outdoor environment, from a 4G LTE eNB that we configure to operate at 3.51 GHz. Using the raw I/Q samples, and using Matlab's LTE Toolbox, we provide a step-by-step description for frequency offset estimation/correction, synchronization, cell search, channel estimation, and reference signal received power (RSRP). We provide various representative results for each step, such as RSRP measurements and corresponding analytical approximation at different UAV altitudes, coherence bandwidth and coherence time of the channel at different UAV altitudes and link distances, and kriging based 3D RSRP interpolation. The collected raw data as well as the software developed for obtaining and post-processing such data are provided publicly for potential use by other researchers. AERIQ is also available in emulation and testbed environments for external researchers to access and use as part of the NSF AERPAW platform at NC State University.}, journal={2023 IEEE AEROSPACE CONFERENCE}, author={Maeng, S. J. and Ozdemir, O. and Guvenc, I. and Sichitiu, M. L. and Dutta, R. and Mushi, M.}, year={2023} }
 @article{gurses_funderburk_kesler_powell_rahman_ozdemir_mushi_sichitiu_guvenc_dutta_et al._2023, title={Demonstration of Joint SDR/UAV Experiment Development in AERPAW}, ISSN={["2155-7578"]}, DOI={10.1109/MILCOM58377.2023.10356351}, abstractNote={The Aerial Experimentation and Research Platform for Advanced Wireless (AERPAW) is an outdoor testbed providing the experimenters access to programmable radios and programmable vehicles. A key aspect of AERPAW is its experiment development environment. This demo introduces potential users to the main capabilities of AERPAW’s development environment. The demo exercises the main three flexible testbed capabilities, namely the ability of an experimenter to choose a wireless radio setup, a vehicle setup, and to set up traffic. The experiment is then executed live, and the collected data is post-processed and displayed.}, journal={MILCOM 2023 - 2023 IEEE MILITARY COMMUNICATIONS CONFERENCE}, author={Gurses, Anil and Funderburk, Mark and Kesler, John and Powell, Keith and Rahman, Talha F. and Ozdemir, Ozgur and Mushi, Magreth and Sichitiu, Mihail L. and Guvenc, Ismail and Dutta, Rudra and et al.}, year={2023} }
 @article{maeng_ozdemir_guvenc_sichitiu_mushi_dutta_2023, title={LTE I/Q Data Set for UAV Propagation Modeling, Communication, and Navigation Research}, volume={61}, ISSN={["1558-1896"]}, DOI={10.1109/MCOM.005.2200784}, abstractNote={Unmanned aerial vehicles (UAVs) have recently been gaining considerable attention due to their vast range of potential applications. To facilitate UAV use cases involving beyond visual line of sight (BVLOS), cellular networks have emerged as ground connectivity points, enabling remote control and payload communication for UAV links. However, the availability of limited datasets obstructs the study of cellular technology coverage for UAV flights at different altitudes and the development of machine learning (ML) techniques for improving UAV communication and navigation. In this article, we introduce raw LTE in-phase and quadrature (I/Q) sample data sets obtained from physical field experiments of the NSF AERPAW experimentation platform. A UAV equipped with a software-defined radio (SDR) was flown at altitudes ranging from 30 m to 110 m, collecting raw I/Q samples from an SDR-based LTE base station operating at 3.51 GHz. We have implemented a standardized metadata format that can be used to replicate the results obtained from the collected datasets. The post-processing of raw I/Q samples is described and representative results are provided. In the end, we give examples of potential uses of the provided dataset, post-processing sample code, and I/Q collection sample experiment code by other ML, wireless, and UAV researchers.}, number={9}, journal={IEEE COMMUNICATIONS MAGAZINE}, author={Maeng, Sung Joon and Ozdemir, Ozgur and Guvenc, Ismail and Sichitiu, Mihail L. and Mushi, Magreth and Dutta, Rudra}, year={2023}, month={Sep}, pages={90–96} }
 @article{maeng_ozdemir_nandakumar_guvenc_sichitiu_dutta_mushi_2023, title={Spectrum Activity Monitoring and Analysis for Sub-6 GHz Bands Using a Helikite}, ISSN={["2155-2487"]}, DOI={10.1109/COMSNETS56262.2023.10041314}, abstractNote={In this paper, we report sub-6 GHz spectrum measurement results at multiple ground fixed nodes and a helikite flying at altitudes up to 500 feet. Measurements are carried out at the NSF AERPAW platform in Raleigh, NC. We first describe our measurement methodology using software defined radios (SDRs) and explain the details of the measurement environment. Subsequently, we analyze the impact of terrain, measurement altitude, measurement frequency, and the time of the day on spectrum measurements for various different sub-6 GHz bands. In particular, we present spectrum occupancy results from various different LTE bands first in a rural environment, and then in an urban campus environment. Results show that for both environments, measured power at a given spectrum band increases with altitude up to 500 feet. On the other hand, in the urban environment, an abrupt increase in the aggregate received power is observed in all considered bands as the helikite rises above the buildings, when compared with the more gradual increase of the received power in same bands for the rural environment.}, journal={2023 15TH INTERNATIONAL CONFERENCE ON COMMUNICATION SYSTEMS & NETWORKS, COMSNETS}, author={Maeng, S. J. and Ozdemir, O. and Nandakumar, H. N. and Guvenc, I. and Sichitiu, M. L. and Dutta, R. and Mushi, M.}, year={2023} }
 @article{maeng_guvenc_sichitiu_floyd_dutta_zajkowski_ozdemir_mushi_2022, title={National Radio Dynamic Zone Concept with Autonomous Aerial and Ground Spectrum Sensors}, ISSN={["2164-7038"]}, DOI={10.1109/ICCWORKSHOPS53468.2022.9814648}, abstractNote={National radio dynamic zone (NRDZs) are intended to be geographically bounded areas within which controlled experiments can be carried out while protecting the nearby licensed users of the spectrum. An NRDZ will facilitate research and development of new spectrum technologies, waveforms, and protocols, in typical outdoor operational environments of such technologies. In this paper, we introduce and describe an NRDZ concept that relies on a combination of autonomous aerial and ground sensor nodes for spectrum sensing and radio environment monitoring (REM). We elaborate on key characteristics and features of an NRDZ to enable advanced wireless experimentation while also coexisting with licensed users. Some preliminary results based on simulation and experimental evaluations are also provided on out-of-zone leakage monitoring and real-time REMs.}, journal={2022 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS)}, author={Maeng, S. J. and Guvenc, I and Sichitiu, M. L. and Floyd, B. and Dutta, R. and Zajkowski, T. and Ozdemir, O. and Mushi, M.}, year={2022}, pages={687–692} }
 @article{mushi_joshi_dutta_guvenc_sichitiu_floyd_zajkowski_2022, title={The AERPAW Experiment Workflow - Considerations for Designing Usage Models for a Computing-supported Physical Research Platform}, ISSN={["2159-4228"]}, DOI={10.1109/INFOCOMWKSHPS54753.2022.9798061}, abstractNote={The AERPAW project is an ambitious project, funded by the PAWR program of the US NSF, to create a remote accessible research platform for a research facility with some distinct features that makes its usage model unique, and non-obvious to many researchers desirous of making use of this platform. AERPAW is primarily a physical resource (not a computing or cyber-resource) - the RF enviroment, and the airspace. Experimenters can explore them through radio transceivers and Unmanned Aerial Vehicles, both under the Experimenter’s programmatic control. Since the entire workflow of the user is through the mediation of virtual computing environments, users often tend to think of AERPAW as a computing resource, and find some of the experiment workflow counter-intuitive. In this paper, we articulate the challenges and considerations of designing an experiment workflow that balances the need for guaranteeing safe testbed operation, and providing flexible programmatic access to this unique resource.}, journal={IEEE INFOCOM 2022 - IEEE CONFERENCE ON COMPUTER COMMUNICATIONS WORKSHOPS (INFOCOM WKSHPS)}, author={Mushi, Magreth and Joshi, Harshvardhan P. and Dutta, Rudra and Guvenc, Ismail and Sichitiu, Mihail L. and Floyd, Brian and Zajkowski, Thomas}, year={2022} }