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An Agile Full-Duplex 5G Testbed for OTA Testing at 28 GHz: from GbE-based to OTA Live Streaming of 8 HD Videos

Duarte, L. ; Gomes, R. ; Ribeiro, C. ; Fernandes, T. ; Hammoudeh, Akram Hammoudeh ; Sanchez , M. ; Caldeirinha, R. F. S.

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Date: January 2019

This Temporary Document (TD) aims to report on recent advances presented in [1], [2] on a complete endto-end 5G testbed fully reconfigurable based on FPGA design, with a 1 GHz baseband processing ready for a 8x8 MIMO, and its extension and miniaturisation to 28 GHz.
Initial results of real-time over-the-air (OTA) 5G mmWave testbed demonstration, including both generation of new
waveforms (baseband) and the design of novel RF frontends at 28 GHz, providing a system throughput up to 16 Gbps, will be presented. The testbed has been designed as a real-time agile FPGA based platform based on Software-Defined-Radio (SDR) concept, enabling on-the-fly digital modulations up to 1024-QAM (IP TWEVO, Lda). Particular features will
be presented, which includes, but not limited to, the design of novel digital signal processing algorithms (in baseband)
to mitigate impairments induced by the radio channel, IQ imbalances, Doppler (CFO) effect and channel estimation
(with aid of both pilots and sequences), in addition to 8 x 8 MIMO-OFDM architecture easily scalable to support
(MASSIVE) MIMO configurations (32 x 32).