Backscatter Wireless Reception Using Pilot-Aided 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 system receiver.
Innovation Solution
Implement a method where a first device receives a first and second target signal, with the second signal being obtained by backscattering a fourth signal, and includes a pilot signal to enhance channel estimation and improve signal reception performance.
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 second device as an intermediary that performs active transmission of pilot signals to assist the zero-power terminal. This intermediary device enables the terminal to perform backscattering communication without needing its own active transmission capability, thus maintaining low complexity while improving signal reception performance through better channel estimation
Solution Approach 2:
The patent changes the modulation parameters by using QPSK modulation for the active transmission signals instead of simple ASK. This parameter change in the transmission scheme allows for more robust communication while the zero-power terminal still uses simple backscattering, resolving the contradiction between simplicity and performance
2Device complexity
If zero-power terminals use envelope detection for signal reception, then device complexity is reduced, but measurement precision of channel estimation deteriorates
Solution Approach 1:
The second device acts as an intermediary that transmits known pilot signals, enabling the zero-power terminal to perform more accurate channel estimation through backscattering. The intermediary's active transmission provides reference signals that improve measurement precision without increasing the terminal's complexity
Solution Approach 2:
The system performs preliminary transmission of pilot signals by the second device before the actual data transmission. This preliminary action provides channel estimation information in advance, allowing the zero-power terminal to compensate for channel effects without needing complex real-time processing
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 signal reception performance by enabling accurate channel estimation and data recovery in zero-power terminals using backscattering communication.
Implementation Method 1
the second signal is obtained by backscattering a fourth signal by a third device
Data Source
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.