RFID Symbol Coding with Leading-Bit Subsets for Higher Data Rates
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Solution Overview
Problem
Conventional RFID systems face limitations in data transmission rates due to the complexity of signal processing and the number of symbols within a symbol duration, which restricts data transfer rates and increases processing complexity.
Innovation Solution
A method for coded data transmission that divides symbols into two sub-sets, with a 'leading bit' indicating the sub-set assignment, allowing for increased bit duration and reduced processing complexity, and uses load-modulation to transmit encoded symbols within a symbol duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional coding schemes with numerous higher order coding methods are applied, then the data transmission rate is improved, but the processing complexity increases tremendously
Solution Approach 1:
The patent divides the set of symbols into two distinct sub-sets, where each sub-set is assigned to a specific bit value (0 or 1). This segmentation allows the receiver to first identify which sub-set a symbol belongs to based on the bit value, thereby simplifying the decoding process. Instead of evaluating numerous symbols simultaneously, the system narrows down the search space to one of two sub-sets, significantly reducing processing complexity while maintaining high data transmission rates.
2Productivity
If the number of symbols within a symbol duration is increased to enhance data rate, then the data transmission rate is improved, but the complexity of signal processing increases
Solution Approach 1:
By segmenting the symbol set into two sub-sets based on bit values, the patent reduces the computational burden of signal processing. The receiver can efficiently determine the transmitted symbol by first identifying the appropriate sub-set through bit value evaluation, then searching within that specific sub-set. This approach enables higher data rates without proportionally increasing processing complexity.
Solution Approach 2:
The patent performs preliminary classification of symbols into two sub-sets before the actual decoding process. By pre-organizing the symbol space according to bit values, the system prepares the data structure in advance to facilitate faster and simpler processing during reception. This preliminary action reduces the real-time processing requirements while maintaining high transmission efficiency.
3Productivity
If a position of transition within a symbol duration defines a symbol of a coded character set, then data transmission is achieved, but the number of symbols within a symbol duration is limited resulting in low data rates
Solution Approach 1:
The patent segments the coded character set into two sub-sets based on the position of transitions within the symbol duration. By associating each sub-set with a specific bit value, the system can transmit more information per symbol without significantly increasing the complexity of the coding scheme. The receiver uses the transition position to identify the sub-set, thereby efficiently decoding the transmitted data at higher rates.
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 significantly enhances data transfer rates by almost doubling the data rate while simplifying signal processing, allowing for more efficient data transmission in RFID systems.
Implementation Method 1
far field communication systems are based on a radar principle. A portion of the incoming power of said electromagnetic carrier wave signal produced by the base station is reflected by the antenna of the transponder and returned to the base station. This is also referred to as 'backscatter' principle.
Implementation Method 2
In order to transmit data from the transponder to the base station, for example a load resistor, being connected in parallel with the coil is switched on and off in time with a data stream to be transmitted via an air interface. An amplitude of a reflected portion of electromagnetic carrier wave can thus be modulated (so called load-modulation).
Implementation Method 3
If the transponder is moved into an electromagnetic field provided by the base station, a current is induced in the large area coil of the transponder and the electronic circuit of the transponder is powered up.
Data Source
AI summary
A method for coded data transmission between a base station (10) and at least one transponder (20) within a wireless data transmission system (1), the method comprising the steps of: —providing a set of symbols (S1 . . . S2n) for encoding data (DD), wherein the set of symbols (S1 . . . S2n) is divided into at least two sub-sets (SS1, SS2), and wherein each symbol (S1 . . . S2n) of the complete set is assigned to one of said at least two sub-sets (SS1, SS2); —encoding said data (DD) using symbols (S1 . . . S2n) of said at least two sub-sets (SS1, SS2), wherein at least one encoded symbol (S1 . . . S2n) comprises several bits; —transmitting each encoded symbol (S1 . . . S2n) within a symbol duration (SD) of an encoded data signal (DS) between said base station (10) and at least one transponder (20), wherein the sub-set (SS1, SS2) assigned to each encoded symbol (S1 . . . S2n) is indicated by a value of at least one bit (LB) of each encoded symbol (S1 . . . S2n); —identifying the value of said at least one bit (LB) of the transmitted encoded symbols within the encoded data signal (DS); —determining the sub-set (SS1, SS2) assigned to each encoded symbol (S1 . . . S2n) depending on the identified value of said at least one bit (LB); and —decoding each encoded symbol (S1 . . . S2n) according to the determined sub-set (SS1, SS2).