Efficient Model-driven Beam Steering System Design And Implementation

With the prevalence of wireless devices and maturation of communication facility,the increasing demand for wireless transmission drives the development of the high-frequency band transmission industry.The wireless transmission service is catching more and more attention in commercial.However,the low robustness during the move is the Achilles'heel of the millimeter-wave's transmission.60GHz radio communicates through high directional links formed by beamforming of phased-array rather than using omnidirectional antennas as commonly used in Wi-Fi/cellular networks.Mobile devices or obstruction will result in beam misalignment between Tx and Rx,and often lead to enormous increase in delay and even link interruption.The traditional 60 GHz protocol re-aligns the beams by scanning the spare Tx/Rx beams.However,this cumbersome process will take up a lot of channel time.This paper provides a model-driven beam control method for 60 GHz links in mobile scenarios.This work is based on the observation that the SCP of 60 GHz channel at adjacent locations are highly correlated.With this correlation,the SCP can be reconstructed when Tx/Rx is moving using reverse engineering without any channel scanning.We also design and incorporate greedy approximation algorithm in the system to greatly reduce the computational complexity associated with reverse engineering.In this way,the system can predict the best new beams with minimal overhead and readj ust the links of mobile devices.Our experimental results show that compared with the latest technologies in various practical situations,the system designed in this paper can bring several times of throughput growth.