QAM Constellation Mapping for Phase-Noise-Robust Modulation

The patent applies local quality by using non-uniform constellation point distributions where different regions of the constellation have different spacing characteristics. Specifically, constellation points are arranged with larger minimum distances in directions more susceptible to phase noise, while maintaining tighter packing in other directions to preserve spectral efficiency. This localized optimization of point spacing resolves the contradiction by adapting the constellation geometry to the specific noise characteristics of the channel.

The patent changes the geometric parameters of the constellation by using non-square aspect ratios and non-uniform scaling between in-phase and quadrature components. By adjusting these parameters, the constellation can be optimized for specific noise conditions, particularly phase noise at higher frequencies. This parameter optimization allows the system to maintain higher spectral efficiency while improving robustness against noise through careful geometric design.

The patent introduces asymmetry by using non-square constellation geometries where the scaling factors for in-phase and quadrature components differ. This asymmetric design allows the constellation to be rotated and scaled independently in different directions, enabling optimization for phase noise conditions. The asymmetric structure provides greater resilience to phase noise by creating larger effective distances in phase-affected directions while maintaining high data rates through efficient packing.

The patent applies dynamics by making the constellation geometry adaptable through selective scaling and rotation operations. The system can dynamically adjust the effective constellation orientation and spacing based on channel conditions, particularly phase noise characteristics. This dynamic adaptation allows the higher-order QAM to maintain robustness against noise while preserving spectral efficiency, resolving the contradiction between data rate and noise sensitivity.

The patent segments the QAM constellation into independently scalable in-phase and quadrature components with different scaling factors. This segmentation allows separate optimization of each component's contribution to noise resilience. By treating the I and Q components differently through distinct scaling, the system can compensate for phase noise effects while maintaining a relatively simple implementation structure that builds upon conventional QAM frameworks.

The patent creates a universal constellation framework that can be adapted to different frequency bands and noise conditions through parameter adjustment. The non-square constellation with independent scaling factors serves multiple functions: it maintains compatibility with standard QAM implementations, provides enhanced phase noise resilience at higher frequencies, and can be configured for various spectral efficiency requirements. This multi-functionality resolves the contradiction by making the system both simple to implement and robust at higher frequencies.