Digitally Controllable Scatterer Codewords for Unified Wavefront Shaping
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Solution Overview
Problem
Conventional methods for configuring Digitally Controllable Scatterers (DCS) in electromagnetic systems face high computational complexity, require significant time to converge, and are not harmonized for different wavefront manipulations, leading to inefficient and complex codeword generation and exchange.
Innovation Solution
A radio frequency device and method that determines a codeword based on quadric surface properties to configure the phase shifts of DCS scattering elements, allowing for efficient manipulation of electromagnetic waves in various scenarios, reducing computational complexity through a compressed codeword representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel estimation techniques are used to configure DCS phase shifts, then the propagation channel can be estimated, but the computational complexity becomes exponential with respect to the number of scattering elements
Solution Approach 1:
The patent segments the codeword representation into two parts: a common component that applies to all scattering elements and a differential component that provides element-specific adjustments. This segmentation reduces the overall computational complexity while maintaining channel estimation accuracy, as the common component can be computed once and reused across all elements.
Solution Approach 2:
The patent changes the parameter representation from individual phase shifts for each scattering element to a compressed representation using common and differential components. This parameter transformation reduces the exponential complexity to a manageable level while preserving the essential channel characteristics needed for accurate estimation.
2Adaptability or versatility
If conventional codeword generation methods are used, then far-field or near-field wavefront manipulation can be achieved, but the methods are not harmonized for different wavefront scenarios
Solution Approach 1:
The patent creates a universal codeword generation framework that handles both far-field and near-field wavefront scenarios through a single harmonized method. The common-differential component structure provides a unified approach that adapts to different wavefront types without requiring separate specialized algorithms, thereby improving versatility while reducing complexity.
3Manufacturing precision
If detailed codeword information for all scattering elements is stored and exchanged, then precise DCS configuration is achieved, but the storage and exchange requirements become very large
Solution Approach 1:
The patent extracts the common component from the full codeword representation, separating it from the differential components. This extraction allows the majority of the configuration information to be stored and exchanged efficiently as a single common component, while only minimal differential data is needed for precise element-specific configuration, dramatically reducing data volume.
Solution Approach 2:
The patent transforms the storage and exchange parameters from individual element-specific phase values to a compressed common-differential representation. This parameter change reduces the data volume from exponential to linear or logarithmic scale while maintaining the precision needed for accurate DCS configuration through the differential adjustment mechanism.
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
Enables flexible and efficient manipulation of electromagnetic waves by DCS, reducing computational complexity and codeword storage, and enabling applications such as beam focusing, single/multi-user focusing, and hologram generation across near and far field scenarios.
Implementation Method 1
a DCS comprising a scattering surface that comprises a plurality of scattering elements, each having a controllable phase shift
Implementation Method 2
control the scattering elements of the scattering surface of the DCS, using the codeword, to form the desired electromagnetic wave by scattering the electromagnetic wave transmitted by the transmitter
Data Source
AI summary
The disclosure provides a radio frequency device, comprising a DCS with a surface that comprises scattering elements having a controllable phase shift, a transmitter configured to transmit an electromagnetic wave onto the scattering surface of the DCS, and a DCS controller. The DCS controller determines a codeword based on one or more parameters of the DCS, a characteristic of the electromagnetic wave transmitted by the transmitter and a characteristic of a desired electromagnetic wave scattered by the scattering surface of the DCS 102. The codeword determines a phase shift configuration for the plurality of scattering elements of the scattering surface of the DCS. Then, the DCS controller controls, using the codeword, the scattering elements of the scattering surface of the DCS to form the desired electromagnetic wave by scattering the electromagnetic wave transmitted by the transmitter.