Serial Link Monitoring Circuitry for Distortion-Aware Modulation Control
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Solution Overview
Problem
High-speed serial link technologies face challenges such as channel bandwidth, distortions (e.g., inter-symbol interference, jitter, noise), cost/power efficiency, and latency, which existing methods struggle to address effectively.
Innovation Solution
A link monitoring circuitry is employed to determine a figure of merit (FOM) of a communication link, enabling health monitoring, modulation scheme selection, and configuration optimization by analyzing analog waveform samples and digital bits, using techniques like waveform fitting, noise measurement, and equalization to improve channel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed serial link technologies advance to provide higher channel bandwidth, then data transmission capacity is improved, but channel distortions (inter-symbol interference, jitter, noise) worsen
Solution Approach 1:
The system performs preliminary channel characterization by transmitting training sequences and measuring the channel response before actual data transmission. This preliminary action allows the receiver to determine equalization parameters and modulation scheme selection in advance, compensating for anticipated channel distortions at high speeds.
Solution Approach 2:
The system dynamically changes operational parameters including equalization coefficients, modulation order, and coding rates based on measured channel conditions. By adjusting these parameters according to the figure of merit calculation, the system optimizes performance while adapting to the worsened channel distortions at higher bandwidths.
2Reliability
If complex monitoring and control techniques are implemented to address channel distortions, then link reliability is improved, but circuit complexity and power consumption increase
Solution Approach 1:
The monitoring circuitry is designed to perform multiple functions using the same hardware resources: channel characterization, figure of merit calculation, modulation scheme selection, and equalization parameter determination. This multi-functionality improves link reliability while minimizing the increase in circuit complexity by avoiding redundant dedicated circuits for each function.
Solution Approach 2:
The system uses the existing receiver signal processing path and available hardware resources to perform monitoring and channel characterization functions. Rather than adding completely independent monitoring circuits, the system leverages existing components to serve dual purposes, reducing the overall complexity overhead.
3Measurement precision
If advanced equalization and waveform fitting techniques are used to reduce distortions, then measurement precision is improved, but processing latency increases
Solution Approach 1:
The system applies waveform fitting and equalization techniques selectively based on the measured channel conditions and figure of merit. Rather than always applying the most computationally intensive processing, the system uses partial action by adapting the level of processing to the actual channel quality, thereby reducing average latency while maintaining precision when needed.
Data Source
AI summary
Various embodiments provide apparatuses, systems, and methods to determine a figure of merit (FOM) of a communication link (e.g., a serial communication link, also referred to herein as a channel) between a transmitter and a receiver. The FOM may be used to, for example, determine a health of the communication link during mission mode (normal operating mode), determine a modulation scheme to use for the communication link, determine a configuration to use for the receiver and/or transmitter, and/or another suitable use case. Other embodiments may be described and claimed.