Equalizer Coefficient Feedback for Faster High-Speed Link Training
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Solution Overview
Problem
High-speed communication systems face inter-symbol interference due to low-pass frequency response characteristics of communication channels, leading to signal distortion and degradation, which existing equalizers struggle to effectively compensate for.
Innovation Solution
The implementation of a training operation where receiver-side equalizer coefficients are used to iteratively adjust transmitter-side equalizer coefficients, minimizing their absolute values to reduce inter-symbol interference, with control information being fed back to enhance the equalization performance of both transmission and reception equalizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed communication is implemented, then data exchange capacity increases, but inter-symbol interference and signal distortion occur due to low-pass frequency response characteristics
Solution Approach 1:
The transmitter-side equalizer performs pre-equalization on the signal before transmission to compensate for the low-pass frequency response characteristics of the communication channel. By adjusting the coefficients of the transmitter-side equalizer in advance based on receiver-side equalizer coefficients, the signal is pre-conditioned to counteract expected channel distortion, thereby maintaining signal quality at high data exchange rates
Solution Approach 2:
The system implements a feedback mechanism where the receiver-side equalizer coefficients are used to iteratively adjust the transmitter-side equalizer coefficients. The receiver measures the actual signal quality and feeds back coefficient adjustment information to the transmitter, enabling continuous optimization of the pre-equalization process to maintain reliable communication at high speeds
2Reliability
If traditional equalization methods are used, then signal distortion is compensated, but training time is excessive
Solution Approach 1:
The receiver-side equalizer coefficients are calculated in advance during a brief training period, and these pre-calculated coefficients are then used to configure the transmitter-side equalizer. This preliminary calculation approach avoids the need for lengthy iterative training of the transmitter-side equalizer, significantly reducing training time while maintaining equalization performance
Solution Approach 2:
The system copies the receiver-side equalizer coefficients to the transmitter-side equalizer as an initial configuration. By using the receiver's measured coefficients as a starting point for the transmitter's pre-equalization, the system leverages the receiver's training results to quickly establish effective transmitter-side equalization without requiring separate extensive training
Data Source
AI summary
An electronic device includes a reception equalizer that performs, a first equalization on a first signal based on a first coefficient, and one or more second equalizations on one or more second signals based on the first coefficient, the one or more second signals being based on a second coefficient associated with one or more characteristics of a transmission equalizer of the external device, and circuitry that iteratively sends control information generated based on the first coefficient to the external device until a termination condition is satisfied with regard to the first coefficient, the control information causing the second coefficient to be increased or decreased, the iteratively sent control information causing a first absolute value of the first coefficient corresponding to a final equalization of the one or more second equalizations to become smaller than a second absolute value of the first coefficient corresponding to the first equalization.