Dynamic Metasurface Uplink MIMO for Low-Power Near-Field Beamforming
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Solution Overview
Problem
Existing large-scale MIMO wireless communication systems face challenges with high power consumption, high hardware costs, and limited laying area, particularly in near-field broadband uplink transmissions.
Innovation Solution
A near-field broadband uplink MIMO transmission method assisted by a dynamic metasurface antenna, which involves jointly designing a baseband beamforming matrix and a weight matrix of the dynamic metasurface antenna to maximize the near-field broadband large-scale MIMO uplink sum rate, considering near-field effects, frequency-selective fading, and spatial broadband effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large-scale MIMO is implemented with existing hybrid beamforming technology, then transmission performance is improved, but power consumption increases sharply
Solution Approach 1:
The patent changes the fundamental parameters of the antenna system by using metasurface technology with tunable permittivity and permeability, replacing traditional hybrid beamforming hardware. This allows achieving large-scale MIMO performance with reduced power consumption through analog domain signal processing and dynamic parameter adjustment of the metasurface elements.
Solution Approach 2:
The patent substitutes the mechanical/electronic hybrid beamforming system with a metasurface-based system that processes signals in the analog domain. This replacement eliminates the need for complex digital signal processing chains and associated power consumption, while maintaining or improving transmission performance.
2Productivity
If large-scale MIMO is implemented with existing hybrid beamforming technology, then transmission performance is improved, but hardware costs increase
Solution Approach 1:
The patent utilizes metasurface elements with tunable electromagnetic parameters (permittivity and permeability) that can be adjusted dynamically. This approach replaces expensive traditional antenna arrays and beamforming hardware with a more cost-effective metasurface implementation that achieves the same or better performance through parameter control rather than complex hardware.
Solution Approach 2:
The metasurface antenna structure serves multiple functions simultaneously: it acts as both the radiating element and the beamforming device, and can operate across different frequency bands and modes (TE/TM). This multi-functionality reduces the need for separate components, thereby lowering overall hardware costs while maintaining transmission performance.
3Productivity
If large-scale MIMO is implemented with existing hybrid beamforming technology, then transmission performance is improved, but laying area is limited
Solution Approach 1:
The patent employs metasurface technology which consists of thin-film structures with sub-wavelength elements. These flexible, planar structures can be deployed in compact spaces and conform to various surfaces, enabling large-scale MIMO functionality without requiring extensive laying area compared to traditional rigid antenna arrays.
Solution Approach 2:
The metasurface antenna utilizes the electromagnetic field dimension rather than physical space dimension for signal processing. By manipulating electromagnetic parameters in the metasurface layers, the system achieves beamforming and signal processing capabilities without proportionally increasing the physical footprint, thus overcoming the laying area limitation.
Data Source
AI summary
The present invention discloses a near-field broadband uplink MIMO transmission method assisted by a dynamic metasurface antenna. The method includes: Broadband signals sent by a plurality of users distributed in a near-field region are processed with a large-size dynamic metasurface antenna as a receive antenna on a base station side, which can reduce system hardware costs and power consumption; and compared with the current hybrid beamforming based on a phase shifter and a conventional antenna, hybrid beamforming based on the dynamic metasurface antenna can effectively improve transmission performance. The present invention proposes an algorithm framework jointly designing a dynamic metasurface antenna and a baseband beamformer and including method such as matrix-weighted mean square error sum (MWMSE) minimization, alternate optimization, matrix vectorization, and MM. The present invention implements near-field broadband large-scale MIMO uplink transmission assisted by a dynamic metasurface antenna with low algorithm complexity and good convergence.