Data Carrier Load Modulation Adaptation for Distance
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Solution Overview
Problem
Existing data carriers for contactless communication with a base station via an electromagnetic field struggle to accurately determine transmission data due to the distance-dependent speed of the antenna signal's envelope rise and fall, leading to unreliable data analysis at the base station.
Innovation Solution
Incorporating detection means to determine the energy information of the antenna signal, comparator means to adjust the ratio of load and off-load periods based on the detected energy information, and modification means to optimize the duration ratio of these periods according to the distance from the base station, ensuring effective data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data carrier uses fixed load and off-load periods for modulation, then the modulation scheme is simple, but the base station cannot reliably analyze the antenna signal when the data carrier is far away due to distance-dependent envelope rise and fall speeds
Solution Approach 1:
The patent applies dynamics by making the load and off-load period durations adjustable rather than fixed. The modification means dynamically change the duration ratio of load periods to off-load periods based on the detected distance from the base station. This allows the modulation scheme to adapt to different transmission distances, ensuring reliable signal analysis at the base station regardless of whether the data carrier is close or far away.
Solution Approach 2:
The patent implements feedback by using detection means to measure the distance between the data carrier and base station, then using this distance information to adjust the modulation parameters. The comparator means compare the detected distance with reference values and the modification means adjust the load/off-load period ratio accordingly. This closed-loop feedback mechanism ensures optimal modulation settings for reliable data transmission.
2Length of stationary object
If the data carrier is positioned far from the base station, then the communication range is extended, but the envelope of the antenna signal rises and falls too slowly for reliable data analysis
Solution Approach 1:
The patent applies parameter changes by modifying the temporal parameters of the modulation signal - specifically the durations of load and off-load periods - based on the transmission distance. When the data carrier is far from the base station, the system extends the load period duration and shortens the off-load period duration. This parameter adjustment compensates for the slow envelope rise and fall speeds caused by distance, ensuring the base station can still reliably detect and analyze the signal envelope for data retrieval.
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 solution allows for reliable analysis of the antenna signal at the base station by adjusting the load and off-load periods, improving data transmission accuracy and reducing errors, especially when the data carrier is positioned far from the base station.
Implementation Method 1
an antenna coil connected to a first coil terminal and to a second coil terminal, in which antenna coil an antenna signal can be induced in operation by the electromagnetic field
Implementation Method 2
the electromagnetic field being load-modulated during the load periods by modifying the value of the impedance of a modulation load that is connected at least indirectly to the first coil terminal and the second coil terminal
Data Source
AI summary
In a data carrier (1), there are provided modification means (19) for modifying, as a function of the distance between the data carrier (1) and the base station (4), the ratio of the duration of a load period (TB) to the duration of an off-load period (TE), at which ratio the data carrier (1) load-modulates the electromagnetic field (HF) generated by a base station (4).