Ambient Backscatter Phase-Shift Precoder for Interference Management
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Solution Overview
Problem
Ambient backscatter communication systems face challenges in achieving effective data decoding due to the interference from interfering signals, which complicates the implementation and increases energy costs, especially in IoT applications, as the receiving device struggles to reach the required power threshold in complex propagation environments.
Innovation Solution
The system employs a focusing precoder with phase-shifting capabilities to modulate the phase of signals, optimizing the phase difference between backscattered and interfering signals, allowing for advantageous combinations that maximize electromagnetic power received, thereby simplifying the implementation and reducing the complexity of electronics required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving device performs processing operations to cancel the interfering signal, then the decoding capability is improved, but the device complexity and implementation cost increase
Solution Approach 1:
The patent applies this principle by using the interfering signal constructively through phase-shifting to enhance the backscattered signal power at the receiving device, rather than attempting to cancel it. The source device adjusts the phase of the interfering signal to align with the backscattered signal, converting what was previously harmful interference into a beneficial power enhancement that simplifies the receiving device while maintaining decoding capability
Solution Approach 2:
The patent applies this principle by performing phase-shifting of the interfering signal at the source device before the signal reaches the receiving device. This preliminary action at the source eliminates the need for complex signal processing at the receiving end, as the power enhancement is already achieved before the signal arrives at the receiver
2Productivity
If the transmitting device backscatters the ambient signal, then data communication is enabled, but the electromagnetic power received by the receiving device may not reach the power threshold due to interfering signals
Solution Approach 1:
The patent applies this principle by changing the phase parameter of the interfering signal through phase-shifting. By adjusting the phase of the interfering signal to align with the backscattered signal, the system increases the total electromagnetic power received at the receiving device, ensuring it reaches the required power threshold for reliable data communication
Solution Approach 2:
The patent converts the harmful interfering signal into a beneficial power source by phase-shifting it to constructively combine with the backscattered signal. This approach transforms the interference that previously prevented power threshold achievement into a power enhancement mechanism that enables reliable data communication
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 the efficiency of ambient backscatter communication by increasing the power variation between non-backscattering and backscattering states, making it easier to reach the power threshold and improve data decoding, while reducing the complexity and cost of implementation.
Implementation Method 1
a step of phase-shifting, by the source, one of the components of the precoder P according to said value φ_i, so as to obtain a precoder Q_i
Data Source
AI summary
A method for selection by an ambient backscatter system including a source as well as transmitting and receiving devices, the source being associated with a precoder for focusing signals towards the devices. Furthermore, the method includes, for a plurality of values ϕ_1, . . . , ϕ_N: a phase-shift, by the source, of one of the components of the precoder according to the value ϕ_i, so as to obtain a precoder Q_i; an emission, by the source, using the precoder Q_i; an acquisition, by the receiving device, of power measurements during non-backscattering and backscattering states, a determination, by the receiving device, of a value D1_i representative of a power deviation between the measurements. The method also includes a selection, by the receiving device, of a maximum value among the values D1_1, . . . , D1_N.