LDPC Transmitter Segmentation for Fewer FEC Frames
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Solution Overview
Problem
Existing signal transmitters and receivers face challenges in efficiently segmenting and encoding information bits to meet the performance requirements for digital broadcasting, particularly in high definition digital television and portable broadcasting, where varying signal lengths can exceed preset values, leading to excessive parity bits and inefficient error correction.
Innovation Solution
A transmitter is designed with a segmenter that divides information bits into blocks based on preset reference values, using an outer encoder and Low Density Parity Check (LDPC) encoder to generate parity bits, ensuring the number of segmented bits is equal to or less than a specific number, and adjusts code rates and repetition conditions to optimize encoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If information bits are segmented into blocks based on preset reference values, then error correction efficiency is improved and the number of FEC frames is reduced, but device complexity increases due to multiple encoders and segmentation logic
Solution Approach 1:
The information bits are segmented into multiple blocks based on preset reference values before encoding. This segmentation allows each block to be processed independently by the outer encoder and LDPC encoder, improving error correction efficiency while enabling parallel processing that can mitigate the complexity increase through modular architecture
Solution Approach 2:
The preset reference values used for segmentation are dynamically determined based on the code rate and repetition conditions. This dynamic adaptation allows the system to optimize the segmentation granularity according to different transmission scenarios, improving reliability while avoiding unnecessary complexity for fixed scenarios
2Reliability
If the number of segmented information bits is limited to be equal to or less than a specific number, then encoding performance is improved, but the productivity of data transmission is reduced due to increased segmentation overhead
Solution Approach 1:
The specific number limit for segmented information bits is not fixed but is determined based on the code rate and repetition conditions. By adjusting this parameter dynamically, the system can optimize the balance between encoding performance and transmission efficiency for different operational scenarios, preventing excessive segmentation overhead while ensuring performance requirements are met
Data Source
AI summary
A transmitter is provided. The transmitter includes: a segmenter configured to segment information bits into a plurality of blocks based on one of a plurality of preset reference values; an outer encoder configured to encode each of the plurality of blocks to generate first parity bits; and a Low Density Parity Check (LDPC) encoder configured to encode each of the plurality of blocks and the first parity bits to generate an LDPC codeword including second parity bits, wherein the one of the preset reference values is determined depending on at least one of a code rate used to encode each of the plurality of blocks and the first parity bits and whether to perform repetition of at least a part of the LDPC codeword in the LDPC codeword.