LDPC Transmitter Bit Repetition and Puncturing for Decoding Reliability
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Solution Overview
Problem
Current signal transmitters and receivers face limitations in providing improved performance for digital broadcasting services, particularly in high-definition digital television and portable broadcasting devices, as existing methods do not adequately address the need for enhanced transmitting and receiving schemes.
Innovation Solution
A transmitter system utilizing a Low Density Parity Check (LDPC) encoder, repeater, and puncturer to encode and repeat bits, thereby improving decoding performance by selectively adding and puncturing parity bits, which enhances the transmission of broadcasting signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bits are repeated to improve decoding performance, then reliability is improved, but device complexity increases
Solution Approach 1:
The transmitter is divided into three functional modules: LDPC encoder for encoding input bits, repeater for selective repetition of parity bits, and puncturer for selective puncturing. This segmentation allows each module to perform its specific function independently, improving decoding performance through bit repetition while managing complexity through modular design.
Solution Approach 2:
The repeater and puncturer dynamically select which parity bits to repeat or puncture based on calculated numbers of bits. The system adapts the repetition and puncturing operations according to the specific input bits and channel conditions, optimizing decoding performance while controlling the complexity through selective rather than universal operations.
2Productivity
If parity bits are punctured to reduce transmission overhead, then productivity is improved, but reliability deteriorates
Solution Approach 1:
The puncturer performs partial puncturing on only some parity bits rather than all parity bits. By selectively puncturing a calculated number of parity bits based on the input bits, the system achieves transmission efficiency improvements while maintaining sufficient reliability through the repetition of selected parity bits and preservation of others.
Data Source
AI summary
A transmitter is provided. The transmitter includes: a low density parity check (LDPC) encoder configured to encode input bits to generate an LDPC codeword including the input bits and parity bits; a repeater configured to select at least a part of bits constituting the LDPC codeword and add the selected bits after the input bits; and a puncturer configured to puncture at least a part of the parity bits.