Multi Antenna refers to a system that involves the use of multiple antennas at both the transmitter and receiver ends. This technology is commonly known as Multiple Input, Multiple Output (MIMO) in the context of wireless communication. The primary purpose of using multiple antennas is to improve the efficiency and reliability of data transmission by exploiting spatial diversity. These systems play a crucial role in modern wireless communication by harnessing spatial diversity to enhance data throughput, reliability, and overall system performance.



Enabling Cooperative Hybrid Beamforming in TDD-based Distributed MIMO Systems

Enabling Cooperative Hybrid Beamforming in TDD-based Distributed MIMO Systems Distributed massive MIMO networks are envisioned to realize cooperative multi-point transmission in next-generation wireless systems. For efficient cooperative hybrid beamforming, the cluster of access points (APs) needs to obtain precise estimates of the uplink channel to perform reliable downlink precoding. However, due to the radio frequency (RF) impairments between the transceivers at the two en-points of the wireless channel, full channel reciprocity does not hold which results in performance degradation in the cooperative hybrid beamforming (CHBF) unless a suitable reciprocity calibration mechanism is in place. We propose a two-step approach to calibrate any two hybrid nodes in the distributed MIMO system. We then present and utilize the novel concept of reciprocal tandem to propose a low-complexity approach for jointly calibrating the cluster of APs and estimating the downlink channel. Finally, we validate our calibration technique’s effectiveness through numerical simulation.