Digital Receiver Waveform Compensation for Skew and Amplitude Distortion
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Solution Overview
Problem
In high-speed digital signal processing, the sampling rate of A/D converters is limited by operating speed and power consumption, making it difficult to achieve sufficient distortion compensation for super high-speed signals, particularly in next-generation optical fiber communication systems exceeding 100 Gb/s, where skew and insufficient bandwidth complicate distortion control and circuit size.
Innovation Solution
A digital receiver with a compensation filter that sets skew and amplitude compensation amounts and determines filter coefficients for accurate phase and amplitude compensation, using FIR filters for linear interpolation and amplitude compensation to address these limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling rate of A/D converters is increased to improve distortion compensation accuracy, then the compensation precision is improved, but the operating speed and power consumption of the A/D converter are exceeded
Solution Approach 1:
The patent applies dynamics by making the filter coefficients adaptive rather than fixed. The coefficients are dynamically adjusted based on the actual signal characteristics and distortion conditions, allowing the system to achieve optimal compensation performance without requiring excessive sampling rates. This dynamic adaptation enables accurate distortion compensation at practical sampling rates.
Solution Approach 2:
The patent changes the parameters of the compensation filter by optimizing and adapting the filter coefficients according to the specific signal conditions. By adjusting these parameters (coefficients) rather than increasing the sampling rate, the system achieves improved distortion compensation accuracy while maintaining feasible operating speeds and power consumption levels.
2Measurement precision
If the sampling rate of A/D converters is increased to improve distortion compensation, then the compensation accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent achieves improved distortion compensation accuracy by optimizing filter coefficients rather than increasing sampling rate. This parameter optimization approach maintains power consumption at acceptable levels while achieving the desired compensation performance, avoiding the exponential power consumption increase that would result from higher sampling rates.
3Measurement precision
If complex distortion compensation is applied to super high-speed signals, then the compensation accuracy is improved, but the circuit size increases
Solution Approach 1:
The patent uses dynamic coefficient adaptation instead of complex fixed-structure compensation circuits. By making the filter coefficients adaptive and可调, the system achieves high compensation accuracy with a more compact circuit implementation, avoiding the need for large-scale complex compensation structures.
Solution Approach 2:
The patent achieves accurate distortion compensation by optimizing filter parameters (coefficients) rather than increasing circuit complexity. This parameter-based approach maintains compact circuit size while achieving the required compensation performance for super high-speed signals.
Data Source
AI summary
An objective is to provide a digital receiver and a method of compensating waveform that are capable of compensating waveform distortion without increasing the circuit size. A digital receiver 100 according to the present invention includes distortion compensation filters 103 that compensate waveform distortion included in an input signal, skew compensation amount setting units 106 for setting a skew compensation amount used for compensating phase distortion among the waveform distortion, amplitude compensation amount setting units 107 for setting an amplitude compensation amount used for compensating amplitude of the input signal that attenuates upon the compensation of the phase distortion using the skew compensation amount, and filter coefficient calculation circuits 108 for determining a filter coefficient to be set to the distortion compensation filters 103 based on the skew compensation amount and the amplitude compensation amount.