LDPC Bit Repetition Pattern for Better Decoding in Transmitters
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Solution Overview
Problem
Current digital broadcasting systems face challenges in providing efficient signal transmission and reception, particularly in high-definition digital television and portable broadcasting devices, where existing methods do not adequately support improved transmitting and receiving schemes to meet user demands.
Innovation Solution
A transmitter equipped with a Low Density Parity Check (LDPC) encoder, puncturer, and repeater that selects specific bits from an LDPC codeword using a repetition pattern, punctures parity bits, and repeats selected bits to enhance decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bits are repeated in the LDPC codeword to improve decoding performance, then the reliability of signal transmission is improved, but the device complexity increases due to additional repeater components and repetition pattern processing
Solution Approach 1:
The LDPC codeword is divided into multiple bit groups, and the repetition operation is applied selectively to specific bit groups rather than the entire codeword. This segmentation allows the repeater to process only portions of the data, reducing overall system complexity while maintaining decoding performance improvements.
Solution Approach 2:
Different bit groups within the LDPC codeword are treated differently through selective repetition. The repetition pattern applies varying repetition operations to different local regions (bit groups) based on their importance or error characteristics, rather than uniformly repeating all bits. This local differentiation optimizes decoding performance while minimizing added complexity.
2Reliability
If selective bit repetition is implemented to enhance signal transmission, then the quality of reception is improved, but the processing time increases due to additional repetition operations
Solution Approach 1:
Instead of repeating all bits in the LDPC codeword, the system applies repetition only to selected bit groups determined by the repetition pattern. This partial action approach provides sufficient reception quality improvement while avoiding the excessive processing time that would result from repeating the entire codeword.
Solution Approach 2:
The repetition pattern is predetermined and applied during the encoding stage before transmission. By performing the repetition operation in advance as part of the encoding process, the system prepares the enhanced signal for transmission without adding processing delays at the receiving end during critical decoding operations.
Data Source
AI summary
A transmitter is provided. The transmitter includes at least one processor configured to implement: a Low Density Parity Check (LDPC) encoder which encodes input bits to generate an LDPC codeword including the input bits and parity bits; a puncturer which calculates a number of bits to be punctured in the parity bits and punctures the parity bits based on the calculated number of bits; and a repeater which selects at least a part of bits of the LDPC codeword based on a repetition pattern, and repeats the selected bits after the parity bits, wherein the repetition pattern is a pattern for selecting at least one bit group including the selected bits among a plurality of bit groups configuring the LDPC codeword.