Transmission Equalizer for Non-Contact Magnetic Coupling
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Solution Overview
Problem
Existing near-field wireless communication technologies using non-contact magnetic coupling face challenges with high-frequency distortion due to peak frequencies in the voltage transfer function, which conventional FIR filters struggle to correct, leading to waveform distortions and interference in signal transmission.
Innovation Solution
A transmission equalizer is designed with multiple signal paths that apply different time delays and tap coefficients, allowing for variable delay settings, including relative time delays shorter than a symbol time or set to the reciprocal of peak frequencies, to effectively correct high-frequency distortions in non-contact coupling transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional FIR filter is used to correct distortion in non-contact coupling transmission, then the device complexity is reduced, but the manufacturing precision of distortion correction deteriorates due to inability to correct high-frequency peaks
Solution Approach 1:
The equalizer is segmented into multiple parallel signal paths (first signal path and second signal path) with different delay characteristics. Each path processes the input signal independently with specific time delays, allowing targeted correction of different frequency components. The segmented structure enables precise control over the frequency response to correct high-frequency peaks while maintaining manageable device complexity.
Solution Approach 2:
The equalizer employs variable time delays in the signal paths that can be dynamically adjusted. The first signal path has a shorter time delay while the second signal path has a longer time delay, creating dynamic phase relationships that can be optimized for different operating conditions. This dynamic adjustment capability allows the equalizer to adapt to varying transmission conditions and maintain high correction precision across different scenarios.
2Ease of operation
If the time delay is set to symbol time or half symbol time as in conventional wire transmission, then the ease of operation is maintained, but the measurement precision of high-frequency distortion correction deteriorates
Solution Approach 1:
The equalizer changes the time delay parameter from conventional symbol-time based values to specific values optimized for non-contact coupling characteristics. The first signal path uses a time delay of T/2 while the second signal path uses a time delay of T, where T is the symbol time. This parameter change enables precise correction of high-frequency peaks introduced by the non-contact coupling transmission medium while maintaining operational simplicity through clear, standardized delay settings.
3Speed
If non-contact coupling transmission is used to achieve high data rate in ultra-short distance, then the speed of transmission is improved, but the object-generated harmful factors worsen due to high-frequency distortion and waveform degradation
Solution Approach 1:
The equalizer converts the harmful high-frequency distortion introduced by non-contact coupling into a correctable signal characteristic. By introducing controlled time delays and combining the delayed signals with appropriate weighting, the equalizer transforms the peaky frequency response into a smoother, more desirable response. This approach turns the harmful high-frequency peaks into manageable elements that can be precisely corrected through signal processing.
Solution Approach 2:
The equalizer performs preliminary signal processing at the transmitter end by pre-delaying and weighting the signal components before they enter the non-contact coupling transmission medium. This preliminary action compensates for the harmful high-frequency distortion that will occur during transmission, ensuring that the received signal maintains good waveform characteristics even at high data rates and ultra-short distances.
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 solution effectively corrects high-frequency distortions and improves signal quality by aligning relative time delays with peak frequencies, enhancing data transmission accuracy and reducing jitter and intersymbol interference.
Implementation Method 1
The non-contact coupling of the pair of coupling elements includes a magnetic coupling (inductive coupling) or an electrical coupling (capacitive coupling)
Data Source
AI summary
A transmission apparatus includes a transmission equalizer that equalizes a transmission signal transmitted in a signal transmission performed via a non-contact coupling including a magnetic coupling of a pair of coupling elements. The transmission equalizer creates plural equivalent transmission signals by branching the transmission signal; and includes plural signal paths that respectively give time delays different from each other to the equivalent transmission signals, and respectively multiplies the delayed transmission signals by tap coefficients. In addition, at least one pair of signal paths is set includes a variable delay circuit that can change the corresponding time delay to be given to the corresponding transmission signal.