A Beam Tracking Method for Unmanned Aerial Vehicle Millimeter Wave Communication

Abstract

The invention discloses an unmanned aerial vehicle millimeter wave communication beam tracking method. A time slot structure of unmanned aerial vehicle millimeter wave communication is designed into an exchange time slot and T tracking time slots, and the process in the exchange time slot comprises receiving MSI feedback; Calculating an actual beamforming vector according to the actual position and attitude information of the receiving-end unmanned aerial vehicle in MSI feedback, and predicting the position and attitude information of the receiving-end unmanned aerial vehicle in T tracking time slots in the future; Transmitting information through the actual beamforming vector, Wherein the process in the tracking time slot comprises the steps of calculating a predicted beam forming vectoraccording to a predicted position and attitude information; And transmitting information through the prediction beam forming vector. The position and the posture of the unmanned aerial vehicle are effectively tracked, the millimeter wave communication spectrum efficiency of the unmanned aerial vehicle can be improved under the condition that the unmanned aerial vehicle rapidly moves, channel stateinformation feedback of pilot frequency and a receiving end is not needed, and the time delay error difference between the unmanned aerial vehicle and the real motion state can be reduced.

Description

technical field [0001] The invention relates to the technical field of millimeter-wave beam tracking of unmanned aerial vehicles, in particular to a method for tracking beams of millimeter-wave communication of unmanned aerial vehicles. Background technique [0002] mmWave beam tracking is a technique for maintaining mmWave communication links. Millimeter-wave communication uses narrow beams to compensate for the high path loss of millimeter-wave propagation, and obtains corresponding analog beamforming vectors through beam tracking technology to maintain millimeter-wave beam alignment, which can make full use of antenna array gain, maintain millimeter-wave communication links, and improve mmWave communication performance. [0003] At present, the millimeter-wave beam tracking method mainly uses auxiliary information such as position or directly tracks the signal arrival angle / departure angle. For example, in "Robust beam-tracking for mmWave mobile communications", the ext...

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Problems solved by technology

[0005] The existing scheme only considers the use of the position information of the sending and receiving ends or the position and attitude information of the sending end itself and the direct tracking of the signal arrival angle / departure angle, and does not consider the influence of the attitude change of the UAV movement at the sending and receiving ends. When the movement speed of the UAV is high, there may be obvious lag or even misalignment in the tracking of the signal departure angle / arrival angle, which will affect the millimeter wave beam alignment and reduce the communication rate; when the attitude of the UAV at the transceiver end changes significantly, only It is difficult to achieve a good tracking effect with the millimeter-wave beam tracking assisted by position information assistance / the transmitter's own position and attitude information, which affects the performance of millimeter-wave communication between UAVs

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