DOI: 10.1109/TMTT.2024.3389151   IEEEXplore: https://ieeexplore.ieee.org/document/10509592    

Uplink and Downlink TDD Distributed MIMO Testbed with 1-bit Radio-over Fiber Architecture

2.35 GHz demonstrated in this testbed.

A dither signal combined with the received RF signal is used to generate a binary waveform at the remote radio head (RHH) in the uplink. An RF waveform is generated at the control unit (CU) by a bandpass sigma-delta modulation technique in the downlink. These techniques assures low error vector magnitude (EVM) performance for 1-bit sampling at the CU.

Distributed MIMO applications in 6G wireless networks.

100 MHz radio bandwidth at 2.35 GHz carrier; 10 GS/s sample rate. 42 dB dynamic range of the AGC, 60m line-of sight for 23 dBm UE signals. EVM of 3.3% 10.9% for 10 MBd single-carrier 16 QAM modulation demonstrated .