LDPC Transmitter Parity Scheduling for Reliable Frame Transmission
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Solution Overview
Problem
Current signal transmission methods for digital broadcasting lack efficient mechanisms to provide improved performance and coding gains, particularly in high-definition digital television and portable broadcasting scenarios, where existing methods fail to optimize signal reception and transmission effectively.
Innovation Solution
A transmitter system incorporating a Low Density Parity Check (LDPC) encoder, repeater, puncturer, and additional parity generator to encode, repeat, puncture, and generate additional parity bits for improved signal transmission, specifically using LDPC codewords to enhance coding gain and diversity through selective repetition and puncturing of parity bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parity bits are repeated in the LDPC codeword to improve coding gain, then the reliability of signal transmission is improved, but the device complexity increases due to additional repeater and puncturer components
Solution Approach 1:
The parity bits are segmented into multiple groups, with selected groups being repeated and transmitted in the current frame while other groups are transmitted in previous frames. This segmentation allows the system to achieve diversity gain and coding gain without requiring complete repetition of all parity bits, thereby managing device complexity while improving reliability.
Solution Approach 2:
The system performs preliminary action by transmitting additional parity bits in previous frames before the actual data transmission in the current frame. This allows the receiver to have redundant parity information available in advance, improving error correction capability and reliability without adding complexity to the current frame's transmission structure.
2Reliability
If additional parity bits are transmitted in previous frames to improve diversity gain, then the coding gain is improved, but the loss of time occurs due to delayed transmission of complete parity information
Solution Approach 1:
The system uses periodic action by transmitting different groups of parity bits in alternating frames. Some parity groups are transmitted in previous frames while others are transmitted in the current frame, creating a periodic pattern that balances diversity gain with timely delivery of complete parity information, thereby reducing transmission delay.
3Reliability
If all parity bits are transmitted in the current frame to ensure complete error correction, then the reliability is improved, but the adaptability decreases when channel conditions vary
Solution Approach 1:
The system applies dynamics by making the parity bit transmission adaptive to channel conditions. Based on channel quality indicators, the system can dynamically adjust which parity groups are repeated in the current frame versus transmitted in previous frames, allowing optimal error correction performance under varying channel conditions while maintaining reliability.
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 to be transmitted to a receiver in a current frame; a repeater configured to repeat, in the LDPC codeword, at least some bits of the LDPC codeword in the LDPC codeword so that the repeated bits are to be transmitted in the current frame; a puncturer configured to puncture some of the parity bits; and an additional parity generator configured to select at least some bits of the LDPC codeword including the repeated bits, and generate additional parity bits to be transmitted in a previous frame of the current frame.