Energy-saving precoding method and system for stratospheric non-orthogonal multiple access in beam space

Abstract

The invention provides an energy-saving precoding method and system for stratospheric non-orthogonal multiple access in a beam space, and the method comprises the steps: deducing a scattering component theorem in a stratospheric channel in the beam space according to the limit theorem of a Toeplitz matrix when the scale of an antenna meets a preset requirement; according to a scattering componenttheorem, when the antenna scale reaches a preset requirement, exploring that the power of the signal is mainly concentrated on a direct component of a channel to obtain a user grouping scheme; according to the user grouping scheme, a non-orthogonal multiple access serial interference elimination technology is adopted to obtain a sorted user grouping scheme; digital precoding setting is performed by adopting a zero-forcing algorithm according to the equivalent channel matrix; and a user power calculation formula is optimized according to a scattering component theorem, a user grouping scheme and digital coding setting in a stratospheric channel in a beam space to achieve a precoding energy-saving effect. The HAP-NOMA algorithm in the beam space provided by the invention adopts statistical channel state information, and has the advantages of low information interaction amount, energy conservation and the like.

Description

technical field [0001] The present invention relates to a stratospheric wireless communication method, in particular to an energy-saving precoding method and system for stratospheric non-orthogonal multiple access in beam space. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the requirements of large traffic volume, high speed and high spectrum efficiency of wireless communication have become increasingly urgent, and spectrum resources have become increasingly scarce. The high-altitude platform communication system can seamlessly connect other heterogeneous networks, including: ground and satellite communication systems. The application of massive multiple-input multiple-output technology (Multiple-input Multiple-output, MIMO) on the stratosphere can greatly increase spectrum efficiency. For stratospheric communication technology, maintaining high-quality communication for a long time requires further research...

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Problems solved by technology

B.Wang, L.Dai, Z.Wang, N.Ge and S.Zhou "Spectrum and energyefficient beamspace MIMO-NOMA for millimeter-wave communications using lenses antenna array," IEEE Journal on Selected Areas in Communications, vol.35, no.10, pp.2370-2382, Oct.2017, using real-time CSI to study the precoding algorithm of satellite communication systems, but for massive MIMO communication systems, the feedback overhead of real-time feedback CSI is unacceptable

Z.Lian, L.Jiang, C.He and D.He's literature "User grouping and beamforming for HAP massive MIMOsystems based on statistical-eigenmode," IEEE Wireless Communications Letters, vol.8, no.3, pp.961- 964, June 2019, proposed a user grouping algorithm, but the system model he studied was the traditional stratosphere system, not the stratosphere system under the beam space; at the same time, the literature only considered the processing of the direct component, but ignored Processing of scattered components

[0005] To sum up, the existing stratospheric double-layer precoding schemes are all based on the traditional stratospheric MIMO system, which uses a large number of RFs and has low energy efficiency

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