Cross QAM Symbol Mapping by Bit Reliability Class

The patent applies local quality by differentiating the reliability characteristics of different symbol positions within the cross M-QAM constellation. Specifically, it identifies that certain bit positions (e.g., first and fourth bits in 32-QAM) have lower error rates while others have higher error rates. The invention maps different data priorities to different symbol positions based on their local reliability characteristics, thereby optimizing overall transmission reliability while maintaining high data rates.

The patent implements preliminary action by pre-classifying symbol positions into reliability classes before actual data transmission. The system预先 determines which symbol positions have better error rate performance and establishes a mapping strategy in advance. This allows the transmitter to proactively allocate higher-priority data to more reliable positions, preventing error propagation and improving overall link reliability before transmission occurs.

The patent applies segmentation by dividing the symbol mapping process into distinct stages: first classifying symbol positions into reliability classes, then mapping data bits to symbols based on their priority and the reliability characteristics of target positions. This segmented approach breaks down the complex mapping task into manageable steps, reducing implementation complexity while maintaining the benefits of high-order QAM modulation.

The patent utilizes parameter changes by dynamically adjusting the mapping strategy based on channel conditions and data priority requirements. The system can change mapping parameters such as which symbol positions receive which data priorities, allowing flexible adaptation to different transmission scenarios. This parameter-based control simplifies the overall system design by providing a configurable framework rather than requiring complex fixed mapping logic.