Backscatter Communication Frame for Multi-Tag Spectrum Efficiency
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Solution Overview
Problem
In backscatter communication, the use of sine wave signals for excitation leads to reduced spectrum usage efficiency due to the need for data transmission with only one tag at a time, resulting in wasted transmission resources.
Innovation Solution
A data transmission method that generates a frame carrying data for multiple tags using different modulation schemes, allowing simultaneous communication by indicating the modulation schemes and transmission rates within the frame, enabling multiple tags to receive data concurrently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sine wave signal is used as the excitation signal for backscatter communication, then self interference can be easily eliminated due to constant waveform, but spectrum usage efficiency is reduced because only one tag can be communicated with at a time
Solution Approach 1:
The excitation signal is segmented into multiple orthogonal components (e.g., different orthogonal frequency division multiplexing subcarriers or orthogonal code sequences). Each tag is assigned a unique orthogonal component, allowing multiple tags to be addressed simultaneously while maintaining the ability to eliminate self-interference through orthogonal properties.
Solution Approach 2:
The system transitions from single-dimension time-division multiplexing to multi-dimensional orthogonal multiplexing by introducing additional dimensions such as frequency or code orthogonality. This allows multiple tags to communicate simultaneously on the same time-frequency resource without interference, improving spectrum efficiency while maintaining reliability.
2Ease of operation
If data is transmitted to only one tag at a time using conventional backscatter communication, then communication simplicity is maintained, but transmission resources are wasted and spectrum usage efficiency is reduced
Solution Approach 1:
The base station is designed with multi-functionality to simultaneously generate and manage multiple orthogonal excitation signals for different tags. The system maintains operational simplicity at the base station while enabling concurrent communication with multiple tags, thus improving spectrum efficiency without significantly increasing operational complexity.
Solution Approach 2:
The system performs preliminary assignment of orthogonal signaling resources (frequency subcarriers or code sequences) to different tags before actual data transmission. This pre-configuration enables multiple tags to communicate simultaneously without requiring complex real-time resource management, maintaining ease of operation while improving productivity.
Data Source
AI summary
Embodiments of this application disclose a data transmission method, apparatus, and system in backscatter communication, to improve spectrum usage efficiency of data. An embodiment of this application provides a data transmission method in backscatter communication, including: generating a first frame, where the first frame carries first data and second data, the first data and the second data in the first frame use different modulation schemes, the first data is sent to a first tag, and the second data is sent to a second tag; and sending the first frame to the first tag and the second tag.