LDPC Transmitter Parity Scheduling for Coding Gain and Diversity
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Solution Overview
Problem
Current signal transmission methods for digital broadcasting lack efficiency in providing improved performance and coding gain, particularly in high-definition digital television and portable broadcasting scenarios, where existing methods fail to effectively utilize parity bits for enhanced signal reception.
Innovation Solution
A transmitter system incorporating a Low Density Parity Check (LDPC) encoder, repeater, puncturer, and additional parity generator to generate and transmit additional parity bits, which are used to enhance coding gain and diversity by selectively repeating and puncturing parity bits within the LDPC codeword.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional parity bits are generated and transmitted, then coding gain and diversity are improved, but device complexity increases
Solution Approach 1:
The parity bits are segmented into two groups: first parity bits transmitted in the current frame and second parity bits transmitted in the previous frame. This segmentation allows the system to achieve diversity gain by distributing parity information across different time slots while maintaining manageable complexity through structured transmission patterns.
Solution Approach 2:
Second parity bits for the current frame are generated and transmitted in advance in the previous frame. This preliminary action ensures that parity information is available earlier, improving error correction capability and coding gain without requiring complex real-time processing during the current frame transmission.
2Reliability
If repetition of parity bits is performed, then diversity gain is improved, but loss of time increases
Solution Approach 1:
Parity bits are transmitted periodically across different frames through a structured pattern where second parity bits are sent in the previous frame and first parity bits are sent in the current frame. This periodic transmission achieves diversity gain by distributing information across time slots while maintaining efficient time utilization through regular, predictable transmission intervals.
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.