Simultaneously Transmitting and Reflecting (STAR) RIS Assisted Over-the-Air Computation Systems

no code implementations • 5 Jan 2023 • Xiongfei Zhai, Guojun Han, Yunlong Cai, Yuanwei Liu, Lajos Hanzo

The performance of over-the-air computation (AirComp) systems degrades due to the hostile channel conditions of wireless devices (WDs), which can be significantly improved by the employment of reconfigurable intelligent surfaces (RISs).

Hybrid Beamforming for Massive MIMO Over-the-Air Computation

no code implementations • 8 Jun 2020 • Xiongfei Zhai, Xihan Chen, Jie Xu, Derrick Wing Kwan Ng

It is shown that for the special case with a fully-digital receiver at the AP, the achieved MSE of the massive MIMO AirComp system is inversely proportional to the number of receive antennas.

Energy Efficiency Optimization for Millimeter Wave System with Resolution-Adaptive ADCs

no code implementations • 18 May 2020 • Hualian Sheng, Xihan Chen, Xiongfei Zhai, An Liu, Min-Jian Zhao

This letter investigates the uplink of a multi-user millimeter wave (mmWave) system, where the base station (BS) is equipped with a massive multiple-input multiple-output (MIMO) array and resolution-adaptive analog-to-digital converters (RADCs).

Quantization