Backscatter Signal Reception Using Pilot-Based Channel Estimation
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Solution Overview
Problem
Zero-power terminals in wireless communication systems support only simple modulation modes like amplitude shift keying, leading to suboptimal signal reception performance due to envelope detection by the receiver.
Innovation Solution
Implement a method where a primary system receiver estimates channel information of a backscattering link using pilot signals, enabling improved reception performance by compensating for channel variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If zero-power terminals use simple modulation mode (ASK) for backscattering communication, then device complexity is reduced, but signal reception performance deteriorates
Solution Approach 1:
The patent introduces a first device (full-duplex device) as an intermediary that receives both the second device's active transmission signal and the third device's backscattering signal simultaneously. This intermediary performs channel estimation using pilot signals to separate and decode the backscattering communication, enabling reliable reception of simple ASK modulated signals without increasing the complexity of the zero-power terminal itself.
2Ease of operation
If receiver uses envelope detection manner for ASK signal, then detection simplicity is improved, but signal reception performance deteriorates
Solution Approach 1:
The system implements feedback through channel estimation using pilot signals embedded in the transmission. The first device estimates the backscattering channel based on received pilot signals and uses this channel information to optimally detect the backscattering data, transforming simple envelope detection into a performance-optimized detection process through feedback-driven channel compensation.
3Productivity
If first device receives both active transmission signal and backscattering signal simultaneously, then spectrum efficiency is improved, but signal detection difficulty increases
Solution Approach 1:
The patent segments the received signal into distinct components through channel estimation. By using pilot signals transmitted by the second device and backscattered by the third device, the first device separates the strong active transmission signal from the weak backscattering signal in the composite received signal, enabling independent detection of both signals simultaneously without mutual interference.
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 data reception quality by utilizing channel estimation to mitigate interference and improve signal detection in both backscattering and non-backscattering scenarios.
Implementation Method 1
the second signal is obtained by backscattering a fourth signal by a third device
Data Source
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AI summary
A wireless communication method and device are provided. The method includes the following. A first device receives a first target signal and a second target signal on a target time unit, where the first target signal includes a first signal and a second signal, the second target signal includes a third signal, the first signal and the third signal are transmitted by a second device through active transmission, the second signal is transmitted by a third device through backscattering of a fourth signal, and the first signal, the third signal, and the fourth signal each includes a pilot signal.