Mobile pseudo-Doppler OAM wireless downlink system

By using multiple receiving antennas and pseudo-Doppler technology in mobile receivers to process OAM signals, the problems of low signal-to-noise ratio and sensitivity to positioning errors in traditional OAM communication systems in mobile receivers are solved, and the communication link capacity and signal recovery capability at far-field distances are improved.

CN115868119BActive Publication Date: 2025-09-12HUAWEI TECH CO LTD
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Patent Information

Application Number
CN202180037398.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-05-29
Filing Date
2021-05-29
Publication Date
2025-09-12
Estimated Expiration
2041-05-29

AI Technical Summary

Technical Problem

Traditional RF communication systems based on orbital angular momentum (OAM) suffer from low signal-to-noise ratio and sensitivity to positioning errors in mobile receivers, which limits the capacity improvement of wireless communication links, especially at far-field distances.

Method used

At least three receiving antenna elements are used. By selecting components such as antenna switch switching, phase adjustment unit, modulator, duplex coupler and orthogonal filter group, combined with pseudo-Doppler technology and fast Fourier transform, fractional pseudo-Doppler frequency shift processing and mode separation of OAM signals are realized to adapt to the position change of mobile receiver.

Benefits of technology

The OAM signal processing accuracy and wireless communication link capacity of mobile receivers at far-field distances are improved, the restrictions on large receiving antennas and operating distances are reduced, and the signal recovery capability is enhanced.

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Abstract

The disclosed systems, structures, and methods relate to an orbital angular momentum (OAM) receiver. The OAM receiver includes: at least three receiving antenna elements for receiving radiated OAM-RF waves and generating antenna element output signals; a selection antenna switch for receiving a second receiving antenna element RX 2a and the third receiving antenna element RX 2b outputs and switching between the outputs; a phase adjustment unit for adjusting the phase of the output of the antenna selection switch according to K; a multiple coupler for providing a proportional sum of two modulated signals and a proportional difference of two modulated signals; a switch unit for limiting the coupler output signal to a gating time interval in which a fractional pseudo-Doppler frequency shift occurs; an orthogonal filter bank for generating a vector X(t) including low frequency shift values ​​associated with all K OAM modes; and an adjustment unit for facilitating separation of the OAM‑RF waves.
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