Adaptive Equalizer Using Voltage Amplitude Scanning
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Solution Overview
Problem
Current adaptive equalization methods face challenges such as long adaptive adjustment time, algorithm complexity, and real-time monitoring requirements, particularly in high-speed data transmission where inter symbol interference (ISI) is significant.
Innovation Solution
The method involves determining the range of reference voltage steps corresponding to the amplitude of output signals to adjust the compensation coefficient of an equalizer, allowing for quick and effective equalization of high-frequency signals by leveraging the amplitude of low-frequency signals, thereby reducing adaptive equalization time and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional adaptive equalization algorithms (spectrum equalization, zero forcing, or eye diagram monitoring) are used, then the equalizer can adapt to different channel conditions, but the adaptive adjustment time is long and the algorithm complexity is high
Solution Approach 1:
The patent changes the parameter used for adaptive adjustment from complex signal characteristics (eye diagram, histogram data) to a simple voltage amplitude parameter. By detecting the voltage amplitude of the output signal and comparing it with reference voltage steps, the system quickly determines the compensation coefficient without complex real-time monitoring, thus reducing adaptive adjustment time while maintaining adaptability.
2Adaptability or versatility
If traditional adaptive equalization algorithms are used, then the equalizer can adapt to different channel conditions, but the algorithm complexity increases and real-time monitoring is required
Solution Approach 1:
The patent extracts the essential information needed for adaptive equalization from the complex signal and focuses only on the voltage amplitude parameter. By taking out the amplitude information and using it as the sole basis for adjustment, the system eliminates the need for complex real-time monitoring of eye diagrams, histograms, and other signal characteristics, thereby reducing algorithm complexity while preserving adaptability.
3Measurement precision
If spectrum equalization technology is used, then frequency domain analysis is performed, but real-time judgment and adjustment are difficult and power consumption increases
Solution Approach 1:
The patent uses a simple voltage amplitude measurement approach that consumes minimal power compared to complex spectrum analysis. Instead of performing energy-consuming frequency domain analysis and real-time judgment, the system uses a straightforward voltage comparison method that requires little computational resources and power, achieving the same adaptive equalization function with significantly reduced energy consumption.
4Measurement precision
If zero forcing principle with high-speed clock synchronous sampling is used, then ISI detection is achieved, but the equalization effect greatly depends on the generation process of high-speed clock
Solution Approach 1:
The patent introduces a voltage amplitude parameter as an intermediary that bridges the gap between the input signal and the compensation coefficient. Instead of directly detecting ISI using complex high-speed clock synchronous sampling, the system uses the voltage amplitude of the output signal as an intermediate measurement to infer the compensation needs, thereby reducing dependence on high-speed clock generation while maintaining detection accuracy.
Data Source
AI summary
A method of realization of adaptive equalization and an adaptive equalizer. The adaptive equalizer comprises an equalizer unit, which is used for equaling an input signal according to a compensation coefficient to obtain an output signal; a sampling comparison unit, which is connected to an output of the equalizer and is used for sampling a comparison result of the output signal of the equalizer and a reference voltage corresponding to reference voltage step; a data processing unit, which is connected to the sampling comparison unit and the equalizer unit. It is used for scanning a reference voltage step to determine range of the reference voltage steps to which step the amplitude of the output signal is corresponding; and scanning a compensation coefficient step, and determining the compensation coefficient for equalization according to the range of reference voltage steps. The solution of the present invention resolves such problems as long adaptive adjustment time, algorithm complex and large power consumption of the existing self-adaptive equalization algorithm.