RIS Beamforming Modulation Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently controlling and optimizing radio channel properties for improved performance, particularly in managing amplitude and phase shifts of electromagnetic waves, which affects modulation and beamforming capabilities.
Innovation Solution
A reconfigurable intelligent surface (RIS) with separately activable and controllable portions is used to generate modulated symbols by adjusting amplitude and phase shifts, applying beamforming weights, and dividing into sections for in-phase and quadrature parts to implement modulation schemes like A-PSK and QA-PSK, allowing for dynamic control of electromagnetic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional modulation and beamforming methods are used, then system performance is maintained, but hardware complexity and power consumption increase
Solution Approach 1:
The RIS surface is divided into multiple independently controllable portions or elements, each capable of being activated or deactivated. This segmentation allows the system to achieve different modulation states and beamforming patterns by selectively activating specific portions, thereby reducing the need for complex traditional modulation hardware while maintaining performance.
Solution Approach 2:
The RIS acts as an intermediary between the transmitter and receiver, performing modulation and beamforming functions through its reconfigurable surface properties. This intermediary approach eliminates the need for complex modulation hardware at the transmitter end, as the RIS itself performs the modulation by controlling the phase and amplitude of reflected signals.
2Productivity
If RIS portions are made fully controllable for high-performance modulation, then spectral efficiency improves, but control complexity increases
Solution Approach 1:
Instead of requiring all RIS portions to be simultaneously controllable for high-performance modulation, the system activates only the necessary portions based on the current transmission requirements. This partial action approach achieves the desired spectral efficiency while significantly reducing control complexity compared to full control of all portions.
Solution Approach 2:
The RIS system dynamically adjusts which portions are activated based on real-time communication requirements, channel conditions, and modulation needs. This dynamic reconfiguration allows the system to optimize spectral efficiency for each transmission while keeping control complexity manageable by activating only necessary portions.
3Reliability
If more RIS portions are activated for better beamforming, then beamforming performance improves, but power consumption increases
Solution Approach 1:
The system activates only the minimum necessary number of RIS portions required to achieve the desired beamforming performance for each transmission. By using partial action rather than activating all portions continuously, the system maintains beamforming effectiveness while significantly reducing power consumption.
Solution Approach 2:
RIS portions that are not needed for current transmissions are deactivated or discarded from active use, reducing power consumption. These portions can be recovered and activated when needed for different transmissions or channel conditions, allowing the system to maintain beamforming performance only when and where necessary.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances spectral efficiency and reduces hardware complexity, achieving better modulation and beamforming performance while maintaining low power consumption and complexity.
Implementation Method 1
A Reconfigurable intelligent surface (RIS) is a programmable or controllable structure that can be used to control the propagation of electromagnetic waves by changing the electric and magnetic properties of the surface
Implementation Method 2
the processor is configured to generate a phase of the one or more modulated symbols by controlling one or more phase shifts applied by the one or more activated portions of the RIS
Data Source
AI summary
Methods and apparatuses for controlling a reconfigurable intelligent surface (RIS) to generate one or more modulated symbols may be described herein. The processor may be configured to generate an amplitude of the modulated symbol(s) by activating one or more of the plurality of portions of the RIS. The processor may be configured to generate a phase of modulated symbol(s) by controlling one or more phase shifts applied by one or more activated portions of the RIS. The method may include transmitting the one or more modulated symbols using the RIS. The method may include a RIS-based joint beamforming and/or modulation scheme with low PAPR. The RIS may be divided into one or more portions for attaining various gains. The RIS may be divided into an In-phase and/or Quadrature branches. The method may include an Amplitude-phase shift keying (A-PSK) and/or Quadrature amplitude-phase shift keying (AQ-PSK) joint beamforming and/or modulation scheme(s).