Subframe Grouping for Multipath and Doppler Suppression
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Solution Overview
Problem
In broadcast standards like ATSC 3.0, the influence of multipath propagation and Doppler shift cannot be effectively suppressed due to freely set control parameters for subframes, leading to reception issues in data transmission.
Innovation Solution
A data processing apparatus and method that arranges subframes in physical layer frames by subframe groups with the same FFT sizes, allowing for appropriate setting of modulation and demodulation parameters to mitigate multipath propagation and Doppler shift effects through specific parameter relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control parameters are freely set for each subframe, then adaptability and versatility are improved, but reliability deteriorates due to inability to suppress multipath propagation and Doppler shift
Solution Approach 1:
The patent segments subframes into groups with identical FFT sizes, creating a hierarchical structure where individual subframe flexibility is maintained within groups while groups themselves follow uniform parameters. This segmentation allows control parameter flexibility at the subframe level while ensuring reliability through consistent group-level parameters that resist multipath propagation and Doppler shift effects.
Solution Approach 2:
The patent applies local quality by allowing different control parameters for different subframe groups while maintaining identical parameters within each group. This enables local adaptation to different transmission conditions for different groups of subframes, while ensuring that each local region (subframe group) has optimized parameters for reliable reception.
2Productivity
If different FFT sizes are used for each subframe, then productivity and data transmission efficiency are improved, but manufacturing precision deteriorates due to inconsistent parameter settings
Solution Approach 1:
By dividing subframes into groups with identical FFT sizes, the patent maintains parameter consistency within each group (manufacturing precision) while allowing different FFT sizes for different groups (productivity). This segmentation enables efficient resource allocation across groups while ensuring consistent processing within each group.
Solution Approach 2:
The patent merges multiple subframes with identical FFT sizes into subframe groups, treating them as a unified entity with consistent parameters. This merging ensures parameter consistency across merged subframes while allowing the group structure to support different FFT sizes for different groups, thereby maintaining both precision and efficiency.
3Reliability
If control parameters are uniformly set for all subframes, then reliability is improved by suppressing multipath propagation and Doppler shift, but adaptability deteriorates
Solution Approach 1:
The patent segments subframes into groups, applying uniform control parameters within each group to ensure reliability while allowing different parameter settings for different groups to maintain adaptability. This segmentation resolves the contradiction by enabling both uniformity (for reliability) and diversity (for adaptability) at different hierarchical levels.
Solution Approach 2:
The patent introduces dynamics by allowing the system to adaptively select different control parameters for different subframe groups based on transmission conditions, while maintaining static uniform parameters within each group. This dynamic approach enables the system to balance reliability and adaptability by adjusting parameters at the group level while preserving consistency within groups.
Data Source
AI summary
The present technology relates to a data processing apparatus and a data processing method which can suppress the influence of multipath propagation and the Doppler shift.A data processing apparatus includes a processing unit which performs modulation processing on a physical layer frame including a preamble, which includes a modulation parameter, and one or more subframes, which include data, in which any modulation parameter can be set for each of the subframes, and the subframes are arranged in the physical layer frame collectively by subframe groups which are collections of the subframes with FFT sizes, which are same, when IFFT operation is performed on symbols included in the physical layer frame. The present technology can be applied to, for example, data transmission compliant to a broadcast standard such as ATSC 3.0.