28 GHz over-the-air measurement using an OTFS multi-user distributed MIMO under Doppler effect

Abstract This paper describes the experimental investigation of orthogonal time-frequency space (OTFS) modulation using a 28 GHz multi-user distributed multiple-input multiple-output (D-MIMO) testbed in over-the-air (OTA) and mobility environments to enhance cell throughput millimeter-wave band. We build D-MIMO having newly developed OTFS modulator demodulator, measured signals frequency-division multiplexing (OFDM) with up four user simultaneous connections on an actual office floor. Additionally, Doppler effect is mathematically analyzed confirmed measurements. indicates higher robustness time-variant channels than OFDM. The error vector magnitude (EVM) system are −22 dB 1.9 Gbps 100 MHz signal bandwidth, respectively. To our knowledge, this first describing OTA measurements EVM, throughput, spectral efficiency coherent beamforming system.