Adaptive Pre-emphasis Controller for Data Transmission ISI Reduction
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Solution Overview
Problem
Conventional data communication systems face challenges in automatically determining the optimum pre-emphasis strength value to minimize Inter-Symbol Interference (ISI) due to variable transmission conditions, such as transmission line length and speed, making it difficult to maintain reliable data transmission with minimal bit errors.
Innovation Solution
An adaptive pre-emphasis apparatus that includes a pattern generator, serializer, pre-emphasis circuit, and pre-emphasis controller, which automatically searches for and sets the optimum pre-emphasis strength value by measuring transmission errors like bit errors or eye size, allowing for automatic adjustment based on changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed pre-emphasis strength value is manually set in the transmitter, then the device complexity is reduced, but the reliability deteriorates because the system cannot adapt to variable transmission conditions such as transmission line length and data transmission speed
Solution Approach 1:
The patent implements a feedback mechanism where the receiver measures transmission errors (bit errors or eye size) and sends this information back to the transmitter. The transmitter's pre-emphasis controller uses this feedback to automatically adjust the pre-emphasis strength value, enabling the system to adapt to variable transmission conditions without increasing overall system complexity.
Solution Approach 2:
The system performs self-adjustment through automatic pre-emphasis control. The pre-emphasis controller automatically searches for and sets the optimum pre-emphasis strength value based on transmission error measurements, eliminating the need for manual intervention while maintaining reliable data transmission under varying conditions.
2Reliability
If the pre-emphasis strength value is increased to compensate for high frequency attenuation, then the signal quality improves, but the data eye pattern size decreases when the pre-emphasis strength becomes excessively large
Solution Approach 1:
The patent employs dynamic pre-emphasis control where the pre-emphasis strength value is not fixed but automatically adjusted based on measured transmission errors. The pre-emphasis controller continuously searches for the optimum pre-emphasis strength value that maximizes signal quality while maintaining adequate data eye pattern size, adapting to different transmission conditions in real-time.
Solution Approach 2:
The system changes the pre-emphasis strength parameter dynamically based on transmission conditions. By measuring transmission errors and adjusting the pre-emphasis strength value accordingly, the system optimizes the balance between compensating for high frequency attenuation and preserving data eye pattern size.
3Ease of operation
If manual control of pre-emphasis strength value is used, then the ease of operation is improved, but the adaptability deteriorates because the system cannot automatically adjust to changing transmission conditions
Solution Approach 1:
The patent implements automatic pre-emphasis control with feedback from the receiver. The receiver measures transmission errors and sends this information to the transmitter's pre-emphasis controller, which automatically adjusts the pre-emphasis strength value without requiring manual intervention, thereby maintaining ease of operation while achieving high adaptability to changing transmission conditions.
Solution Approach 2:
The system performs self-adjustment of the pre-emphasis strength value based on measured transmission errors. The pre-emphasis controller automatically searches for and sets the optimum value, eliminating the need for manual control while enabling the system to adapt to variable transmission conditions such as different line lengths and data rates.
Data Source
AI summary
Transmitters for data communication can include a pattern generator configured to generate parallel data stream composed of k bits, k being a natural number greater than 2, a serializer configured to convert the parallel data stream into a serial data stream, a pre-emphasis circuit configured to pre-emphasize the serial data stream based on a pre-emphasis control value, to transmit the pre-emphasized serial data stream to a receiver via a first transmission line, and a pre-emphasis controller configured to receive measured values of transmission errors of the pre-emphasized serial data stream from the receiver via a second transmission line, and configured to set the pre-emphasis control value corresponding to a minimum measured value of the transmission errors, to an optimum pre-emphasis control value.