Broadcast Transmission With Compressed FEC Pointers Without Mapping Tables
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Solution Overview
Problem
Existing methods for digital terrestrial television broadcasting, such as ISDB-T, require complex implementations due to the need for tables to map abbreviated FEC block pointers to their corresponding values for each modulation method and segment, increasing the information size and complexity of reception devices.
Innovation Solution
A transmission and reception system that utilizes a compressed FEC block pointer expressed as an integer multiple of the greatest common divisor of possible values, eliminating the need for tables to restore the pointer, thereby simplifying the implementation and reducing information size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an abbreviated pointer is used to reduce information size, then the pointer size is reduced, but the reception device complexity increases due to the need for mapping tables
Solution Approach 1:
The invention extracts only the necessary portion of the pointer information that cannot be determined by simple calculation. Instead of transmitting the complete pointer, only the offset from the calculated base position is transmitted, eliminating the need for complex mapping tables while preserving the ability to reconstruct the full pointer value at the receiver.
Solution Approach 2:
The invention introduces an intermediary calculation step where the receiver computes a base pointer position using known parameters (segment number, OFDM frame structure) and then adds the transmitted offset to obtain the final pointer value. This intermediary approach replaces the need for pre-stored mapping tables with a simple arithmetic operation.
2Reliability
If a mapping table is used to restore abbreviated pointers, then pointer restoration is possible, but implementation becomes complicated
Solution Approach 1:
The receiving device uses its own internal knowledge of the frame structure and segment positioning to automatically calculate the base pointer position. This self-service approach eliminates the need for externally provided mapping tables, making the implementation simpler while maintaining accurate pointer restoration through deterministic calculation.
3Loss of information
If the pointer is expressed as an integer multiple of the greatest common divisor, then the pointer compression is more efficient, but the calculation complexity increases
Solution Approach 1:
The invention changes the parameter representation by expressing the pointer as an offset from a base position that is itself an integer multiple of the greatest common divisor. This parameter transformation allows for more efficient compression because the offset value is always smaller than the full pointer value, while the calculation remains relatively simple using basic arithmetic operations.
Data Source
AI summary
There is provided a transmission device, a transmission method, a reception device, and a reception method that allow a reduction in information size of a pointer in a simpler manner. The transmission device includes: a generation unit that generates physical layer control information, the physical layer control information being included in a physical layer frame; and a transmission unit that transmits the physical layer frame as a broadcast signal to which a layered division multiplexing method is applied. The physical layer control information includes a compressed pointer obtained by compressing a pointer that indicates a position of the first error correction code block in the physical layer frame and is expressed by an integer multiple of the greatest common divisor of possible values of the pointer. The present disclosure can be applied to a transmission system compatible with a broadcasting method such as the next-generation method of the ISDB-T method, for example.