Method and system for determining filter coefficient

Abstract

The invention is concerned with the method and the system for confirm the coefficient of the filter, the system includes: the sending chip, the receiving chip, the system unit that connects with the sending chip and the receiving chip by the system unit interface, the method is: computes the channel characteristic according to the outputting waveform data of the sending chip and the receiving chip; analog creates the sending pulse signal that is same as the driving waveform edge of the sending chip; traverses the filter coefficient combination, based on each filter coefficient combination, gets the pulse response or eye pattern that is corresponding with the filter coefficient combination by combine the channel characteristic and the sending pulse signal; compares the eye height extent of the eye pattern to confirm the filter coefficient; or compares the waveform extent of the pulse respond and the coding crosstalk target to confirm the filter coefficient, solves the problem in the existing technology.

Description

technical field [0001] The invention relates to signal processing technology in the communication field, in particular to a method and system for determining filter coefficients. Background technique [0002] In the communication process, digital signals are transmitted in the communication channel and have higher and higher transmission rates. Since the channel insertion loss characteristics of the communication channel will affect the signal, once the loss of the communication channel will affect the quality of the signal, The degradation of signals during transmission in communication channels is becoming more and more obvious. In order to ensure high-quality and fast transmission of signals, the channel loss of communication channels such as printed circuit boards and cables cannot be ignored. [0003] Channel loss includes conductor loss and dielectric loss. In the low frequency range, the conductor loss is generally greater than the dielectric loss; beyond a certain f...

AI Technical Summary

Problems solved by technology

[0020] 1. In the existing technical solutions, manual traversal of the filter coefficients is required, and each traversal requires manual measurement of the eye diagram of the receiving end. The steps of traversal and measurement are performed manually, resulting in cumbersome and time-consuming operations.

[0021] 2. The existing technical solution requires the use of an oscilloscope to measure the eye diagram of the receiving end. Due to the limitation of actual conditions, it is very difficult or even impossible to test the receiving waveform at the receiving chip.

[0022] 3. The position of measuring the eye diagram in the existing technical scheme is generally outside the package of the receiving chip, that is, at the receiving end. Due to the influence of the chip package and junction capacitance, there is a difference between the eye diagram inside the receiving chip and the eye diagram measured outside the package. The difference affects the accuracy of determining the filter coefficients

[0023] 4. In the existing technical solutions, complex adaptive equalization technology is required to determine the filter coefficients inside the receiving chip, which increases the difficulty and complexity of chip design, and increases the cost and power consumption of the chip at the same time

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