Dynamic Constellation Configuration for Adaptive Signal Transmission
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Solution Overview
Problem
Current digital modulation methods, particularly QAM, face challenges in dynamically configuring constellation points for efficient signal transmission and reception, leading to suboptimal performance in varying channel conditions and user-defined settings.
Innovation Solution
The method involves configuring a constellation with blocks of 4 constellation points each, where the in-phase and quadrature-phase axis component differences from a reference point are dynamically set, allowing for flexible adjustment based on user input, channel state, and transmission methods, enabling efficient mapping and decoding of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional QAM modulation with fixed constellation points is used, then the modulation scheme is simple and easy to implement, but the system cannot adapt to varying channel conditions and user-defined settings, leading to suboptimal transmission performance
Solution Approach 1:
The patent implements dynamic constellation configuration where the constellation points can be adjusted based on channel conditions and user settings. The system dynamically changes the positions of constellation points in the I-Q plane, allowing adaptation to varying transmission environments while maintaining a manageable structure through predefined patterns.
Solution Approach 2:
The patent changes the parameters of constellation points (I-axis and Q-axis coordinates) to optimize transmission performance. By modifying the coordinates of constellation points based on channel state information and user-defined parameters, the system achieves adaptability without requiring complete redesign of the modulation scheme.
2Productivity
If high-order QAM modulation is used to increase transmission speed, then more bits can be transferred per symbol, but the system becomes more sensitive to noise and channel variations, worsening error rates
Solution Approach 1:
The patent applies local quality by creating blocks of 4 constellation points with specific geometric relationships. Each block has reference points and other points with defined I-axis and Q-axis differences, allowing localized optimization of point distributions to balance data rate and error resilience in different regions of the constellation diagram.
3Adaptability or versatility
If fixed constellation points are used as in traditional QAM, then the modulation scheme is standardized and easy to decode, but the system cannot optimize performance for different channel states and user requirements
Solution Approach 1:
The patent segments the constellation into blocks of 4 points each, with each block having a reference point and three other points with specific coordinate relationships. This segmentation allows independent configuration of different blocks based on channel conditions while maintaining a systematic structure that simplifies the decoding process through predictable geometric relationships.
Data Source
AI summary
An apparatus for transmitting a signal in accordance with an embodiment of the present invention includes a mapper configured to map a modulation symbol to a bit signal by referencing the constellation. The constellation includes a plurality of blocks, and each block includes constellation points, each of which has in-phase (I) axis component value and quadrature-phase (Q) axis component value whose difference from the I axis or Q axis component value of a reference point of the block is a first difference value or a second difference value.