Intelligent Reflecting Surface Reflective-State Modulation
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Solution Overview
Problem
The challenge of improving spectrum efficiency in 6G wireless communication networks due to increased interference and limited line-of-sight links is addressed by integrating intelligent reflecting surfaces (IRS) with index modulation techniques.
Innovation Solution
A method for reflective index modulation using IRS, where data is divided into reflective and phase-amplitude domains, with reflective domain data activating or deactivating groups of reflecting elements and phase-amplitude domain data undergoing traditional modulation, enabling joint demodulation to recover transmitted data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IRS is deployed to provide direct communication links and reduce interference, then communication quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the data stream into two independent parts: reflective domain data (for controlling IRS element states) and phase-amplitude domain data (for traditional modulation). This segmentation allows the system to leverage IRS capabilities for improving communication quality while keeping the control mechanism simple and manageable through separate processing channels.
Solution Approach 2:
The patent introduces a new dimension for data transmission by utilizing the reflective domain (IRS element activation states) as an additional modulation domain beyond traditional phase-amplitude modulation. This dimensional expansion increases communication quality through diversity while maintaining simplicity in each individual domain.
2Productivity
If index modulation is applied to IRS-assisted system to improve spectrum efficiency, then spectrum efficiency is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent separates the modulation process into two independent domains: reflective domain modulation (controlling IRS element states) and phase-amplitude domain modulation (traditional signal modulation). This segmentation enables the system to achieve high spectrum efficiency through joint modulation while keeping detection and measurement straightforward by processing each domain separately at the receiver.
Solution Approach 2:
The patent introduces the IRS control unit as an intermediary that translates reflective domain data into IRS element activation patterns. This intermediary simplifies the detection process by providing a clear mapping between transmitted reflective indices and IRS states, making it easier to detect and measure the modulated signal.
3Adaptability or versatility
If more wireless devices are deployed to meet communication demands, then service coverage is improved, but interference among users increases
Solution Approach 1:
The patent utilizes the reflective domain as an additional dimension for signal transmission, creating orthogonal communication channels through different IRS activation patterns. This dimensional expansion allows more users to share the same physical medium with reduced interference, as each user can be assigned unique reflective domain signatures that are easily distinguishable at the receiver.
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
Enhances spectrum efficiency by transmitting additional data through reflective index modulation, improving communication quality and reducing interference.
Implementation Method 1
An IRS is comprised of many reflecting elements, each reflecting element can reflect wireless signals with an adjustable phase shift
Data Source
AI summary
A method for reflective index modulation based on intelligent reflecting surface, in which an IRS control unit is added into wireless communication system, and the data to be transmitted in a transmission is divided into two parts: a reflective domain data dr and a phase-amplitude domain data dc, the reflective domain data dr is transmitted through a wired connection to the IRS control unit to activate or deactivate each group of reflecting elements, the phase-amplitude domain data dc is modulated through traditional phase-amplitude domain modulation and transmitted to the IRS, the reflected signals contain the information of the reflective domain data dr, through the demodulating the baseband symbol ym,j, an estimated phase-amplitude modulation index m and an estimated reflective index j are obtained to recover the phase-amplitude domain data dc and the value of the reflective domain data dr respectively.