QAM Constellation Mapping for Phase-Noise-Tolerant Wireless Links

The patent applies parameter changes by modifying the QAM constellation geometry from traditional square arrangements to optimized constellations with adjusted amplitude and phase parameters. This includes varying the spacing and distribution of constellation points to maximize distance from decision boundaries, thereby improving noise tolerance while maintaining high spectral efficiency. The optimization involves changing multiple parameters simultaneously including amplitude levels, phase angles, and point distribution patterns.

The patent applies local quality by creating non-uniform constellation point distributions where different regions of the constellation have different spacing characteristics. Specifically, points are positioned to maximize minimum distance to decision boundaries while allowing variable spacing between adjacent points. This local optimization ensures that each constellation point has adequate noise margin in its specific location, collectively improving overall phase noise tolerance across the entire signal space.

The patent applies dynamics by implementing adaptive constellation selection and optimization capabilities. The system can dynamically choose from multiple pre-optimized constellation configurations based on channel conditions, signal-to-noise ratio, and phase noise characteristics. This allows the modulation scheme to adapt its complexity and structure in real-time, selecting simpler constellations when noise is high and more complex ones when conditions permit, thereby optimizing the trade-off between complexity and performance.