LDPC Transmitter Repetition Scheme for Broadcast 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 of a broadcasting signal, allowing for improved decoding performance by selectively adding and puncturing parity bits based on specific calculations.
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, repeater, and puncturer. Each module performs a specific function in the bit repetition process, allowing for modular implementation and independent optimization of each component while achieving overall improved decoding performance.
Solution Approach 2:
Instead of repeating all bits, the repeater selectively repeats only a portion of the bits generated by the LDPC encoder. The number of repeated bits is determined by a specific equation based on the input bit count, providing partial repetition that improves reliability without unnecessarily increasing complexity.
2Productivity
If parity bits are punctured to reduce transmission overhead, then loss of information increases, but productivity improves
Solution Approach 1:
The puncturer removes only a portion of the parity bits rather than all of them. The number of punctured bits is calculated based on the input bit count, providing partial puncturing that improves transmission efficiency while retaining sufficient parity information for reliable decoding.
Solution Approach 2:
The system dynamically adjusts the number of punctured parity bits based on the input bit count. By changing the puncturing parameter according to the specific transmission conditions, the system optimizes the balance between transmission efficiency and information retention for different scenarios.
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.