Pseudo-N-order Spiral Modulation for Phase Noise Resilience

The signal constellation is segmented into multiple circular layers with different radii, where each layer contains signal points with specific amplitude levels. This segmentation allows the system to distribute signal points across different amplitude levels, creating a structure that is both spectrally efficient and resilient to phase noise, as points on outer layers are less affected by phase variations.

The patent employs a circular constellation structure where signal points are arranged on concentric circles rather than a rectangular grid. This curved, radial arrangement ensures that signal points are equidistant from the origin, making the modulation inherently more robust to phase noise while maintaining high spectral efficiency through optimized point distribution.

The patent designs a universal modulation framework that can operate in multiple modes: it functions as traditional QAM when phase noise is minimal, and transitions to spiral-like behavior when phase noise is significant. This multi-functionality allows a single transceiver structure to handle both high spectral efficiency requirements and phase noise robustness without requiring separate hardware for different modulation schemes.

The modulation scheme dynamically adjusts its characteristics based on channel conditions and phase noise levels. The constellation geometry and signal point distribution can be adaptively modified, allowing the system to optimize between spectral efficiency and phase noise robustness in real-time, thereby eliminating the need for fixed, complex dual-structure transceivers.