Amplitude-Phase Modulation for 5G Phase Noise Mitigation
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Solution Overview
Problem
Phase noise significantly impairs wireless communication at high frequencies, limiting the bandwidth and throughput in 5G and 6G networks, necessitating effective noise mitigation strategies.
Innovation Solution
The implementation of a method that uses multiplexed amplitude-phase modulation schemes, allowing for the demodulation of messages by separating received waves into orthogonal I- and Q-branches, and selecting appropriate amplitude and phase levels to mitigate phase and amplitude noise, with the ability to switch between different modulation schemes based on fault rates to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional modulation schemes are used at high frequencies, then the system is simple to implement, but phase noise severely degrades communication reliability and bandwidth usage
Solution Approach 1:
The patent changes the modulation parameters by switching between different modulation schemes (e.g., from QPSK to 16QAM) based on the measured phase noise level. The system adjusts the modulation order and characteristics dynamically to match the current channel conditions, thereby maintaining reliable communication despite varying phase noise levels.
Solution Approach 2:
The system implements feedback by measuring the phase noise level and using this information to select the appropriate modulation scheme. The receiver estimates phase noise characteristics and feeds this information back to the transmitter, which then adapts the modulation parameters accordingly, creating a closed-loop system that responds to phase noise conditions.
2Productivity
If higher modulation orders are used to increase bandwidth, then throughput improves, but phase noise margins are reduced and communication reliability deteriorates
Solution Approach 1:
The system dynamically adapts the modulation scheme based on real-time phase noise conditions. Instead of using a fixed high-order modulation, the system can switch between different modulation orders (e.g., QPSK, 16QAM, 64QAM) depending on the measured phase noise level, allowing it to maximize throughput when conditions permit while ensuring reliability when phase noise is high.
Solution Approach 2:
The patent changes the modulation parameters by switching between different modulation schemes (e.g., from QPSK to 16QAM) based on the measured phase noise level. The system adjusts the modulation order and characteristics dynamically to match the current channel conditions, thereby maintaining reliable communication despite varying phase noise levels.
3Reliability
If adaptive modulation switching is implemented to mitigate phase noise, then communication reliability improves, but system complexity increases
Solution Approach 1:
The system performs preliminary action by pre-configuring multiple modulation schemes with different phase noise margins and characteristics. Instead of designing a completely adaptive system from scratch, the system uses pre-defined modulation modes that can be switched between based on phase noise conditions, reducing the complexity of real-time adaptation.
Solution Approach 2:
The patent segments the modulation system into distinct, pre-defined modulation schemes (e.g., QPSK mode, 16QAM mode, 64QAM mode), each optimized for specific phase noise conditions. This segmentation allows the system to switch between discrete modulation types rather than continuously adapting, simplifying the implementation while maintaining reliability.
Data Source
AI summary
Message faults are expected to become a major problem for next-generation 5G/6G networks, due to signal fading, high backgrounds, and high density of users. Disclosed are methods to modulate and demodulate messages to optimize noise margins, greatly enhancing reliability at negligible cost, according to some embodiments. A transmitter can modulate a message using amplitude-phase modulation, yet a receiver can conveniently receive and process the signals according to separate in-phase (I) and quad-phase (Q) branches, that is, according to QAM. The receiver can then convert the I and Q values to the original waveform amplitude and phase mathematically, and then demodulate those values using predetermined amplitude and phase levels as provided by a proximate demodulation reference. By converting the as-received QAM values to the as-transmitted amplitude-phase values, the receiver can thereby avoid many noise vulnerabilities inherent in QAM-modulated messages, and thereby obtain the full noise margins provided by amplitude-phase modulation.