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Spurred by the dramatic mobile IP growth and the emerging Internet of Things(IoT) and cloud-based applications, wireless networking is witnessing aparadigm shift. By fully exploiting the spatial degrees of freedom, the massivemultipleinput- multiple-output (MIMO) technology promises significant gains inboth data rates and link reliability. This paper presents a time-divisionduplex (TDD)-based 128-antenna massive MIMO prototyping system designed tooperate on a 20 MHz bandwidth. Up to twelve single-antenna users can be servedby the designed system at the same time. System model is provided andlink-level simulation corresponding to our practical TDDbased massive MIMOprototyping system is conducted to validate our design and performance of thealgorithms. Based on the system hardware design demonstrated in this paper,both uplink real-time video and downlink data transmissions are realized, andthe experiment results show that 268.8 Mbps rate was achieved for eightsingle-antenna users using QPSK modulation. The maximum spectral efficiency ofthe designed system will be 80.64 bit/s/Hz by twelve single-antenna users with256-QAM modulation.

Design and Implementation of a TDD-Based 128-Antenna Massive MIMO Prototyping System