Partial Response Feedback Receiver for Nonlinear Signal Compensation
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Solution Overview
Problem
Existing communications methods and systems are overly power hungry and spectrally inefficient, failing to effectively address non-linearity in signal transmission and reception.
Innovation Solution
The system employs non-linearity-compensated, partial response feedback mechanisms, including a pulse shaping filter and equalization circuitry, to optimize signal transmission and reception, using a combination of mapper, pulse shaper, timing pilot insertion, and equalizer circuits to manage inter-symbol interference and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional communications methods are used, then system simplicity is maintained, but spectral efficiency is poor and power consumption is high
Solution Approach 1:
The receiver is divided into multiple functional blocks including equalizer, non-linearity compensator, phase error detector, and symbol decoder. Each block performs a specific function in the signal processing chain, allowing complex operations to be distributed and managed systematically, thereby achieving high spectral efficiency without overwhelming system complexity
Solution Approach 2:
The equalizer performs preliminary signal restoration before subsequent processing stages. By pre-compensating for channel effects and inter-symbol interference early in the reception chain, the system simplifies downstream processing while maximizing spectral efficiency
Solution Approach 3:
The system employs feedback mechanisms where decoded symbols are re-encoded and compared with received signals to detect phase errors and non-linearities. This feedback loop enables continuous correction and optimization, achieving high spectral efficiency through iterative refinement without requiring overly complex open-loop systems
2Reliability
If non-linearity compensation is implemented, then tolerance to non-linearity improves, but device complexity increases
Solution Approach 1:
A dedicated non-linearity compensator block is introduced as an intermediary between the equalizer and phase error detector. This intermediary component specifically addresses non-linear distortion by comparing expected and actual signal characteristics, improving reliability without requiring complex modifications throughout the entire system
Solution Approach 2:
The patent replaces complex hardware-based non-linearity compensation with signal processing algorithms implemented in software or firmware. The non-linearity compensator uses digital signal processing techniques to model and compensate for non-linear effects, reducing hardware complexity while maintaining or improving reliability
3Productivity
If partial response feedback is used, then spectral efficiency increases, but sensitivity to phase error increases
Solution Approach 1:
A phase error detector is implemented that uses feedback from the symbol decoder to compare expected and received phase information. This feedback mechanism continuously corrects phase errors, allowing the system to achieve high spectral efficiency through partial response feedback without being overwhelmed by phase sensitivity
Solution Approach 2:
Phase correction is performed preliminarily in the phase error detector before symbol decoding. By pre-correcting phase errors using feedback from previously decoded symbols, the system reduces the impact of phase sensitivity on overall performance while maintaining high spectral efficiency
Data Source
AI summary
A receiver may receive a signal that was generated by passage of symbols through a non-linear circuit. An equalizer of the receiver may equalize the received signal based on a first non-linearity compensated, inter-symbol correlated (ISC) feedback signal to generate an equalized signal. The receiver may correct a phase error of the equalized signal to generate a phase-corrected equalized signal. The phase correction may be based on a second, non-linearity compensated, inter-symbol correlated (ISC) feedback signal.