no code implementations • 22 Feb 2023 • Fabrizio Carpi, Sivarama Venkatesan, Jinfeng Du, Harish Viswanathan, Siddharth Garg, Elza Erkip
Downlink massive multiple-input multiple-output (MIMO) precoding algorithms in frequency division duplexing (FDD) systems rely on accurate channel state information (CSI) feedback from users.
no code implementations • 3 Jan 2023 • Stefan Wesemann, Jinfeng Du, Harish Viswanathan
Ever since the invention of Bell Laboratories Layer Space-Time (BLAST) in mid 1990s, the focus of MIMO research and development has been largely on pushing the limit of spectral efficiency.
no code implementations • 28 Jun 2022 • Nitish Deshpande, Miguel R. Castellanos, Saeed R. Khosravirad, Jinfeng Du, Harish Viswanathan, Robert W. Heath Jr
The narrowband and far-field assumption in conventional wireless system design leads to a mismatch with the optimal beamforming required for wideband and near-field systems.
no code implementations • 19 May 2022 • Manav Kohli, Abhishek Adhikari, Gulnur Avci, Sienna Brent, Aditya Dash, Jared Moser, Sabbir Hossain, Igor Kadota, Carson Garland, Shivan Mukherjee, Rodolfo Feick, Dmitry Chizhik, Jinfeng Du, Reinaldo A. Valenzuela, Gil Zussman
The measured OtI path gain can vary by up to 40 dB for a given link distance, and the empirical path gain model for all data shows an average of 30 dB excess loss over free space at distances beyond 50 m, with an RMS fitting error of 11. 7 dB.
no code implementations • 8 Mar 2022 • Dipankar Shakya, Dmitry Chizhik, Jinfeng Du, Reinaldo A. Valenzuela, Theodore S. Rappaport
For 28 GHz with 1 W/polarization transmit power in the urban street grid, the downlink data rates for 90% of outdoor users are estimated at over 250 Mbps.
no code implementations • 17 Feb 2022 • Silvio Mandelli, Marcus Henninger, Jinfeng Du
The surge of massive antenna arrays in wireless networks calls for the adoption of analog/hybrid array solutions, where multiple antenna elements are driven by a common radio front end to form a beam along a specific angle in order to maximize the beamforming gain.
no code implementations • 28 Dec 2019 • ohaned Chraiti, Dmitry Chizhik, Jinfeng Du, Reinaldo A. Valenzuela, Ali Ghrayeb, Chadi Assi
We demonstrate that the training time required by the proposed scheme is only 5% of that of exhaustive search.
no code implementations • 1 Aug 2019 • Jinfeng Du, Dmitry Chizhik, Reinaldo A. Valenzuela, Rodolfo Feick, Guillermo Castro, Mauricio Rodriguez, Tingjun Chen, Manav Kohli, Gil Zussman
Coverage in the street directly illuminated by a roof edge antenna is found to suffer an average excess loss of 11 dB relative to free space at 200 m, with empirical slope-intercept fit model representing the data with 7. 1 dB standard deviation.