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1. Experimentation with full-duplex wireless in the COSMOS testbed

   Chen, T. ; Welles, J. ; Kohli, M. ; Baraani Dastjerdi, M. ; Kolodziejski, J. ; Sherman, M. ; Seskar, I. ; Krishnaswamy, H. ; Zussman, G. ( January 2019 , IEEE ICNP’19 Workshop Midscale Education and Research Infrastructure and Tools (MERIT), 2019)

   In order to support experimentation with full-duplex (FD) wireless, we integrated the FlexICoN Gen-2 wideband FD radio with the city-scale PAWR COSMOS testbed [1]. In particular, the implemented FD radio consists of an antenna, a customized Gen-2 RF self-interference (SI) canceller box, a USRP software-defined radio (SDR), and a compute node. The RF canceller box includes an RF SI canceller implemented using discrete components on a printed circuit board (PCB), which emulates its RFIC canceller counterpart. The Gen-2 RF SI canceller achieves 50 dB RF SI cancellation across 20 MHz bandwidth using the technique of frequency-domain equalization (FDE) [2]. In this abstract, we present the design and implementation of the remotely accessible Gen-2 wideband FD radio integrated with the COSMOS sandbox at Columbia University. We also present an example real-time wideband FD wireless link demonstration using the GNU Radio software. 

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2. Open-Access Full-Duplex Wireless in the ORBIT and COSMOS Testbeds

   https://doi.org/10.1145/3411276.3412185  

   Kohli, Manav ; Chen, Tingjun ; Dastjerdi, Mahmood Baraani ; Welles, Jackson ; Seskar, Ivan ; Krishnaswamy, Harish ; Zussman, Gil ( September 2020 , in Proc. ACM MobiCom'20 Workshop on Wireless Network Testbeds, Experimental evaluation & Characterization (WiNTECH))

   null (Ed.)

   ABSTRACT In order to support experimentation with full-duplex (FD) wireless, we recently integrated two generations of FD radios in the open-access ORBIT and COSMOS testbeds. First, we integrated a customized 1st generation (Gen-1) narrowband FD radio in the indoor ORBIT testbed. Then, we integrated two 2 nd generation (Gen-2) wideband FD radios in the city-scale PAWR COSMOS testbed. Each integrated FD radio consists of an antenna, a customized RF self-interference (SI) canceller box, a USRP software-defined radio (SDR), and a remotely accessible compute node. The Gen-1/Gen-2 RF SI canceller box includes an RF canceller printed circuit board (PCB) which emulates a customized integrated circuit (IC) RF canceller implementation. The amplitude- and phase-based Gen-1 narrowband RF canceller achieves 40 dB RF SIC across 5 MHz. The Gen-2 wideband canceller is based on the technique of frequency-domain equalization (FDE) and achieves 50 dB RF SI cancellation (SIC) across 20 MHz. In this paper, we present the design and testbed integration of the two generations of FD radios. We then present example experiments that can be remotely run and modified by experimenters. Finally, we discuss future improvements and potential FD wireless experiments that can be supported by these open-access FD radios integrated in the COSMOS testbed. 

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3. Remote experimentation with open-access full-duplex wireless in the COSMOS testbed

   https://doi.org/10.1145/3372224.3417324  

   Kohli, Manav ; Chen, Tingjun ; Welles, Jackson ; Dastjerdi, Mahmood Baarani ; Kolodziejski, Jakub ; Sherman, Michael ; Seskar, Ivan ; Krishnaswamy, Harish ; Zussman, Gil ( September 2020 , in Proc. ACM MOBICOM'20, 2020)

   null (Ed.)

   ABSTRACT To support experimentation with full-duplex (FD) wireless, we recently integrated two FlexICoN Gen-2 wideband FD radios in the open-access, city-scale NSF PAWR COSMOS testbed. Each integrated FD radio consists of an antenna, a customized Gen-2 RF self-interference (SI) canceller box, a USRP software-defined radio, and a remotely accessible compute node. The RF SI canceller box includes an RF canceller printed circuit board which emulates an integrated circuit implementation based on the technique of frequency-domain equalization. The Gen-2 canceller box can achieve up to 50 dB RF SI cancellation across 20 MHz bandwidth. In this demo, we present the design and implementation of the open-acccess, remotely accessible FD radios that are integrated in the indoor COSMOS Sandbox 2 at Columbia University. We also demonstrate example experiments that are available to researchers, where demo participants can observe the visualized performance of the open-access FD radios 

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4. Demo Abstract: Open-Access Full-Duplex Wireless in the ORBIT Testbed

   Tingjun Chen, Mahmood Baraani ( January 2018 , IEEE INFOCOM'18)

   In order to support experimentation with full-duplex (FD) wireless, we integrated an open-access FD transceiver with the ORBIT testbed [1]. In particular, an ORBIT node with a National Instruments (NI)/Ettus Research Universal Software Radio Peripheral (USRP) N210 software-defined radio (SDR) was equipped with the Columbia FlexICoN Gen-1 customized RF selfinterference (SI) canceller box. The RF canceller box includes an RF SI canceller that emulates an RFIC canceller, which is implemented using discrete components. It achieves 40 dB RF SI cancellation across 5MHz bandwidth. This demonstration presents the design and implementation of the open-access FD transceiver and the baseline program, as well as an example of a remote FD experiment where 85 dB overall SI cancellation is achieved across both the RF and digital domains. 

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5. Poster: Enabling wideband full-duplex wireless via frequency-domain equalization

   Chen, T. ; Baraani Dastjerdi, M. ; Welles, J. ; Zhou, J. ; Krishnaswamy, H. ; Zussman, G. ( January 2019 , ACM MOBICOM’19)

   Full-duplex (FD) wireless can significantly enhance spectrum efficiency but requires tremendous amount of selfinterference (SI) cancellation. Recent advances in the RFIC community enabled wideband RF SI cancellation (SIC) in integrated circuits (ICs) via frequency-domain equalization (FDE), where reconfigurable RF filters are used to channelize the SI signal path. In [2], we designed and implemented an FDEbased RF canceller on a printed circuit board (PCB). We also presented an optimized canceller configuration scheme based on the derived canceller model, and extensively evaluated the performance of the FDE-based FD radios in a softwaredefined radio (SDR) testbed in different network settings. 

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