RFID Reader Encoding for Higher Passive Tag Energy Transfer
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Solution Overview
Problem
Passive RFID tags face low energy acquisition during data transmission due to the limitations of existing encoding methods, such as the Manchester encoding method, which affects their operational efficiency.
Innovation Solution
A new data transmission method that encodes binary data using specific principles to modulate and transmit symbols with varying level transitions, optimizing energy delivery to the tag while maintaining unchanged bandwidth, by encoding binary data x1 and x2 with distinct level transitions and time lengths to enhance energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Manchester encoding method is used for data transmission to passive tag, then timing and synchronization information is abundant, but the energy acquired by passive tag is low
Solution Approach 1:
The patent changes the encoding parameters by using variable-length symbols instead of fixed-length Manchester encoding. Binary data '0' is encoded as a symbol with level transition in the middle, while binary data '1' is encoded as a symbol without level transition. This parameter change allows the system to maintain timing information while increasing the proportion of high-level signals, thereby improving energy acquisition for passive tags.
2Use of energy by moving object
If signal operation time is increased to increase energy acquisition at tag end, then energy acquired by tag increases, but data transmission efficiency decreases
Solution Approach 1:
The patent changes the temporal parameters of signal encoding by creating variable-length symbols where '0' has level transition and '1' does not. This allows the system to transmit data more efficiently while maintaining sufficient energy transfer, as the encoding scheme naturally produces more high-level signals without extending the overall transmission time.
Solution Approach 2:
The patent uses periodic modulation with variable symbol lengths to achieve both energy transfer and efficient data transmission. By periodically modulating the signal with different symbol patterns for '0' and '1', the system maintains rhythm and synchronization while optimizing energy delivery and transmission speed.
3Use of energy by moving object
If high level is used as much as possible in data encoding, then energy acquired by tag increases, but encoding complexity increases
Solution Approach 1:
The patent simplifies the encoding process by changing the fundamental parameter from fixed-length bipolar encoding to variable-length unipolar-like encoding. The encoding rule is straightforward: '0' gets level transition, '1' gets no level transition. This reduces encoding complexity while maximizing high-level signal usage for energy transfer.
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
The proposed method provides more energy to passive RFID tags compared to traditional Manchester encoding, ensuring efficient data transmission without increasing bandwidth occupancy, thus improving the operational efficiency of RFID systems.
Implementation Method 1
a tag, after entering into a magnetic field, receives radio frequency signal from a reader, and sends product information (a passive tag) stored in a tag chip by means of energy acquired through induced current
Data Source
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AI summary
A data transmission method is disclosed, and the method comprises: encoding binary data to be transmitted with encoding principle as follows: encoding binary data x1 in the manner of no jumping at middle phase; encoding binary data x2 in the manner of jumping at middle phase; and after encoding two binary data x1 consecutively with high level of no jumping at middle phase, encoding the immediate following binary data x1 with low level of no jumping at middle phase; encoding binary data x1 with high level of no jumping at middle phase, wherein the binary data x1 follows binary data x1 encoded by using low level of no jumping at middle phase; and encoding binary data x1 immediately following binary data x2 by using high level of no jumping at middle phase; modulating the encoded data; and transmitting the modulated signal.