Uneven Frequency-Domain Basis Allocation for Type II CSI

The patent applies local quality by allocating different numbers of frequency-domain basis vectors to different spatial-domain components based on their individual characteristics. Specifically, spatial-domain components with larger delay spreads are assigned more frequency-domain basis vectors, while those with smaller delay spreads receive fewer vectors. This non-uniform allocation optimizes CSI quality for each component rather than using a uniform approach, directly resolving the contradiction between measurement precision and structure complexity.

The patent changes the parameter of basis vector allocation from uniform to non-uniform distribution across spatial-domain components. By varying the number of frequency-domain basis vectors as a parameter based on delay spread characteristics, the system achieves better CSI quality without proportionally increasing overall feedback overhead, thus resolving the technical contradiction.

The patent segments the frequency domain into multiple sub-bands and further divides the spatial domain into multiple components based on delay spread. By segmenting both dimensions and applying unequal sampling rates to different segments, the system achieves fine-grained CSI quality without requiring uniformly large sub-bands, thus resolving the contradiction between feedback overhead and CSI quality.

The patent applies local quality by assigning different sampling rates to different spatial-frequency segments based on their channel characteristics. Segments with higher delay spreads receive higher sampling rates (more basis vectors), while segments with lower delay spreads receive lower sampling rates. This localized optimization maintains CSI quality without uniformly increasing feedback overhead across all segments.

The patent applies local quality by allocating frequency-domain basis vectors unevenly across spatial-domain components based on their delay spreads. For higher rank representations, this non-uniform allocation ensures that only the necessary number of basis vectors are used for each component, preventing proportional increase in feedback overhead while maintaining the capacity benefits of higher layer counts.

The patent changes the allocation parameter from uniform to non-uniform distribution of basis vectors. By adjusting this parameter based on delay spread characteristics, the system enables higher rank representations without proportionally increasing feedback overhead, thus resolving the contradiction between productivity and device complexity.