Transmitter Baseband Header Padding Overhead Reduction
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Solution Overview
Problem
In DVB-T2 digital broadcasting, the direct inclusion of data field length information in the baseband header leads to transmission overhead, even when no padding field is inserted, due to the fixed size allocation of the DFL field.
Innovation Solution
A method to determine the data field length based on the presence and size of the padding field, where the padding length field and indicator are used to dynamically adjust the baseband frame structure, allowing for efficient mapping of data streams without unnecessary overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the DFL field directly indicates the data field length in the baseband header, then the receiver can easily determine the data field length, but transmission overhead increases even when no padding field is inserted
Solution Approach 1:
The patent extracts the data field length indication function from the fixed DFL field in the baseband header. Instead of always including a 2-byte DFL field, the system removes this field when padding is not inserted, and uses only a 1-byte padding indicator field to convey length information, thereby eliminating unnecessary overhead while preserving the ability to indicate data field length.
Solution Approach 2:
The patent introduces dynamic behavior to the baseband header structure. The DFL field is conditionally included based on whether padding is inserted. When no padding is inserted, the DFL field is omitted and the padding indicator field is set to indicate zero padding length. This dynamic adjustment allows the header size to adapt to actual data requirements, reducing overhead when possible while maintaining accurate length indication when needed.
2Device complexity
If the baseband header includes fixed size allocation for DFL field, then the structure is simple and easy to process, but bandwidth efficiency decreases due to unnecessary overhead
Solution Approach 1:
The patent transforms the static baseband header structure into a dynamic one where the DFL field is conditionally present. The header structure adapts based on padding requirements: when no padding is inserted, the header is smaller (without DFL field); when padding is inserted, the DFL field is included. This dynamic structure maintains processing simplicity while improving bandwidth efficiency by eliminating unnecessary fields.
Solution Approach 2:
The patent applies different structural qualities to different situations. Instead of a uniform header structure, the system uses a variable structure where the presence of the DFL field depends on local conditions (whether padding is inserted). This allows the header to have optimal quality (minimal size) in cases where full length indication is not needed, while providing complete functionality when required.
3Reliability
If padding field is inserted to handle insufficient data stream mapping or network delay, then data integrity is maintained, but transmission overhead increases
Solution Approach 1:
The patent applies partial action by conditionally inserting padding only when necessary. Instead of always inserting padding fields, the system assesses whether padding is needed based on data stream mapping requirements and network delay conditions. When no padding is needed, the padding indicator field is set to indicate zero padding, eliminating unnecessary overhead while maintaining data integrity when padding is actually required.
Data Source
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AI summary
A transmitter includes a baseband frame generator configured to generate a baseband frame comprising a baseband header, a data field, and a padding field; and a mapper to map a plurality of data streams to the data field, wherein the baseband frame generator is further configured to insert a padding length field indicating a byte number of the padding field in the baseband frame, and insert a padding indicator field indicating information about the padding length field in the baseband header.