Broadcast Signal Preamble Coding for Robust PLP Reception
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Solution Overview
Problem
Current digital broadcasting technologies face challenges in improving data transmission efficiency and error correction capabilities, particularly with increasing data sizes and the number of broadcasting channels, which affects the reliability and performance of signal transmission and reception.
Innovation Solution
The method involves generating layer-1 information, applying error correction encoding schemes such as LDPC with shortening and puncturing, interleaving, and modulating the signal frame for transmission, while also using a preamble with cyclic prefix and suffix for improved detection and error correction in the receiving apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correction encoding schemes with shortening and puncturing are applied to layer-1 information, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The error correction encoding is divided into two distinct schemes: a shortening scheme that removes redundant parity bits to increase data capacity, and a puncturing scheme that selectively removes certain bits to adjust code rate. This segmentation allows the system to achieve flexible error correction capabilities while managing complexity through modular design of the encoding process
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the code rate through controlled bit removal (puncturing) and adding dummy bits (shortening). By changing the ratio of information bits to total transmitted bits, the system adapts error correction strength to match channel conditions and data requirements, improving reliability without fixed complexity
2Reliability
If interleaving is applied to error-correction-encoded bits, then error correction performance is improved, but processing time increases
Solution Approach 1:
Interleaving is performed as a preliminary action immediately after error correction encoding and before modulation. By reordering the encoded bits in advance according to a predetermined pattern, the system prepares the data to resist burst errors during transmission. This preliminary interleaving ensures error correction performance is optimized before the signal enters the potentially error-prone transmission channel, while the fixed pattern keeps processing time predictable
3Reliability
If layer-1 information is arranged in the preamble with improved error correction, then reception performance is improved, but data transmission efficiency decreases
Solution Approach 1:
The patent applies different quality levels to different parts of the transmitted signal. The preamble containing layer-1 information receives enhanced error correction through shortening and puncturing schemes, ensuring high reliability for critical control data. Meanwhile, the main PLP data carries more payload information with appropriate but less intensive error correction. This local differentiation of quality ensures reception performance for critical information while maintaining overall data transmission efficiency
Solution Approach 2:
Error correction resources are partially applied to layer-1 information in the preamble through controlled shortening and puncturing, rather than applying maximum error correction to all data. This partial action provides sufficient protection for critical layer-1 information while leaving more capacity available for data transmission in the PLP portion, balancing reception performance with transmission efficiency
Data Source
AI summary
In one aspect of the present invention, the method receiving a signal is disclosed. The method includes receiving a signal transmitted in a radio frequency (RF) band including at least one RF channel, demodulating the received signal, parsing a preamble of a signal frame including layer-1 information, from the demodulated signal, deinterleaving bits of the layer-1 information, decoding the deinterleaved bits using an error correction decoding scheme including a shortening scheme and a puncturing scheme and obtaining physical layer pipes (PLPs) from the signal frame using the error-correction-decoded layer-1 information.