LDPC Transmitter Additional Parity Scheduling for Coding Gain
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Solution Overview
Problem
Current broadcasting signal transmission methods lack efficiency in providing improved performance and coding gain, particularly in digital broadcasting services requiring advanced signal reception schemes.
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 broadcasting signals, enhancing coding and diversity gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional parity bits are generated and transmitted in previous frames, then coding gain and diversity gain are improved, but transmission overhead and system complexity increase
Solution Approach 1:
The parity bits are segmented into two categories: those transmitted in the current frame and those transmitted as additional parity bits in previous frames. This segmentation allows the receiver to combine parity information from multiple frames, improving coding gain and diversity gain while distributing the transmission load across different time slots.
Solution Approach 2:
The additional parity bits for current frame data are generated and transmitted in advance during previous frames. This preliminary action enables the receiver to have access to parity information before the actual data transmission, improving error correction capability and overall system reliability.
2Reliability
If repetition of parity bits is performed in the LDPC codeword, then diversity gain is improved, but transmission time and bandwidth utilization are reduced
Solution Approach 1:
Repetition of parity bits is performed periodically within the LDPC codeword structure. Specifically, certain parity bits are repeated at defined intervals to provide diversity gain without continuously duplicating all parity bits, thereby balancing reliability improvement with transmission efficiency.
3Productivity
If puncturing of parity bits is performed, then transmission overhead is reduced, but error correction capability is degraded
Solution Approach 1:
Certain parity bits are punctured (discarded) from the current frame transmission to reduce overhead, but these same parity bits are recovered and transmitted as additional parity bits in previous frames. This allows the receiver to reconstruct the full parity information for error correction while achieving reduced overhead in the primary transmission.
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.