Communication System Equalization Adjustment via Periodic Training Pattern
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Solution Overview
Problem
In communication systems with high bit rates or long transmission paths, existing technologies face challenges in maintaining high communication quality due to signal attenuation and equalization issues.
Innovation Solution
A communication system comprising a transmission device and a reception device that utilize an alternate pattern alternating at regular intervals to adjust equalization characteristics based on detected frequency components, allowing for real-time adjustment of equalization parameters in the FFE, CTLE, and DFE circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an equalization circuit is used to maintain communication quality in high bit rate or long transmission path systems, then communication quality is improved, but the device complexity increases
Solution Approach 1:
The system transmits a training pattern before actual data transmission to pre-adjust the equalization characteristics. The reception device detects the training pattern, determines equalization parameters, and sends adjustment instructions back to the transmission device, preparing the equalization circuit in advance for optimal performance
Solution Approach 2:
The equalization characteristics are adjusted by changing parameters based on detected training pattern frequency components. The system varies equalization parameters dynamically according to the transmission path characteristics identified during the training phase, optimizing communication quality without permanent hardware modifications
2Manufacturing precision
If traditional training methods using pseudo-random patterns are used to adjust pre-emphasis amount, then equalization adjustment is achieved, but the measurement precision and adjustment accuracy are insufficient
Solution Approach 1:
Instead of using pseudo-random patterns, the system employs a periodic training pattern with known frequency components. This periodic structure enables precise frequency analysis through spectral detection, allowing accurate determination of transmission path characteristics and more precise equalization parameter adjustment
Solution Approach 2:
The reception device detects frequency components of the received training pattern, compares them with expected values, determines appropriate equalization parameters based on the detection results, and feeds back adjustment instructions to the transmission device. This closed-loop feedback mechanism ensures accurate equalization adjustment
Data Source
AI summary
A communication system includes: a transmission device including a transmission data generator, a pattern generator, a transmitter, and a control signal receiver, the transmission data generator that is configured to generate transmission data, the pattern generator that is configured to generate an alternate pattern alternating at every lapse of a predetermined time, the transmitter that includes a first equalization circuit and is configured to transmit a transmission signal including the transmission data and the alternate pattern, the first equalization circuit that is configured to adjust equalization characteristics on the basis of first instruction information, and the control signal receiver that is configured to receive the first instruction information; and a reception device including a receiver, a first detector, and a control signal transmitter, the receiver that is configured to receive the transmission signal, the first detector that is configured to detect a frequency component corresponding to the predetermined time of the alternate pattern included in the transmission signal, and the control signal transmitter that is configured to generate the first instruction information on the basis of a result of detection by the first detector and is configured to transmit the first instruction information.