Sum-Signal Modulation for 5G Phase Noise Mitigation
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Solution Overview
Problem
Phase noise becomes a significant issue at high frequencies in 5G and 6G wireless communication, limiting the full utilization of bandwidth for messaging.
Innovation Solution
The implementation of a sum-signal demodulation method that modulates the amplitude and phase of the overall waveform of a message element, allowing for enhanced noise margins by mitigating both phase noise and amplitude noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional modulation schemes are used at high frequencies, then the system is simpler to implement, but phase noise severely degrades message accuracy and increases fault rates
Solution Approach 1:
The patent changes the modulation parameters by switching from conventional QAM schemes to sum-signal modulation with specific amplitude and phase level configurations. This parameter change creates a modulation scheme that is inherently more resistant to phase noise, allowing reliable communication at high frequencies where conventional schemes fail.
Solution Approach 2:
The system dynamically adapts the modulation scheme based on detected fault types. The base station receives feedback about specific fault conditions and selects appropriate modulation schemes from multiple options, making the system flexible and adaptive to changing phase noise conditions rather than using a fixed conventional scheme.
2Productivity
If higher modulation orders are used to increase throughput, then bandwidth utilization improves, but phase noise tolerance decreases and message faults increase
Solution Approach 1:
The patent employs sum-signal modulation with specific parameter configurations (Namp amplitude levels and Nphase phase levels) that optimize the trade-off between throughput and phase noise tolerance. By carefully selecting these parameters, the system achieves high data rates while maintaining robustness against phase noise, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The system dynamically selects modulation schemes based on channel conditions and fault feedback. When phase noise is detected, the system can switch to more robust modulation schemes, maintaining optimal throughput under varying conditions rather than being locked into a single high-order modulation that would be overly sensitive to phase noise.
3Adaptability or versatility
If multiple modulation schemes are implemented to handle different fault types, then adaptability improves, but system complexity increases
Solution Approach 1:
The patent segments the fault detection and correction process into distinct stages: fault detection, fault type classification, and modulation scheme selection. This segmentation allows the system to handle multiple fault types through a systematic, modular approach rather than requiring a monolithic complex system, making the added adaptability manageable.
Solution Approach 2:
The system uses feedback from the user device about detected fault types to automatically select appropriate modulation schemes. This feedback mechanism enables adaptability to different fault conditions while keeping the complexity manageable, as the selection process is automated based on received feedback rather than requiring complex manual configuration.
Data Source
AI summary
Reliable communications is a central goal of 5G and 6G. However, due to signal fading at high frequencies and interference due to crowding, message faults continue to be a problem. Disclosed are methods for base station and user devices to adjust the modulation scheme according to the types of faults received, including amplitude faults (incorrectly demodulated amplitude levels) and phase faults (incorrectly demodulated phase levels), among others. The base station can select a more suitable modulation scheme based on the types of faults observed by user devices, such as modulation schemes with more or fewer amplitude levels and phase levels. In some versions, the number of amplitude levels is different from the number of phase levels, to combat specific fault problems.