LDPC Bit-Group Interleaving for Decoding-Oriented Symbol Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for improved methods to support high decoding and receiving performance in digital broadcasting services, particularly in a multi-channel, wideband, and high-quality digital environment, where existing technologies fall short in providing efficient data transmission and reception.
Innovation Solution
A transmitting apparatus and method that utilizes an LDPC codeword encoder, interleaver, and modulator to map and transmit bits from a predetermined group of a low-density parity-check (LDPC) codeword, employing a parity check matrix and interleaving techniques to enhance decoding and receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transmission methods are used, then device complexity is reduced, but decoding and receiving performance deteriorates
Solution Approach 1:
The LDPC codeword is divided into multiple bit groups, and each bit group is processed separately through the interleaver. This segmentation allows the system to achieve improved decoding performance through structured interleaving while maintaining manageable processing complexity by handling each group independently rather than processing the entire codeword as a single unit.
Solution Approach 2:
The interleaver performs preliminary rearrangement of bit groups before modulation and transmission. By pre-organizing the bit groups in a specific interleaved sequence, the system prepares the data to be more resilient to channel errors, thereby improving decoding performance without adding complexity during the actual transmission and decoding phases.
2Reliability
If bit mapping is optimized for high performance, then receiving quality improves, but transmission processing time increases
Solution Approach 1:
The system applies different mapping strategies to different bit groups within the LDPC codeword. By optimizing the mapping of specific bit groups that are more critical for decoding performance while using standard mapping for others, the system achieves high receiving quality without uniformly increasing processing time across all bits.
Solution Approach 2:
The interleaver changes the arrangement parameters of bit groups in a systematic way that balances performance optimization with processing efficiency. By using defined interleaving patterns and parameters rather than exhaustive optimization, the system achieves improved receiving quality while avoiding excessive processing time requirements.
Data Source
AI summary
A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to generate a low-density parity check (LDPC) codeword by LDPC encoding of input bits based on a parity check matrix including information word bits and parity bits, the LDPC codeword including a plurality of bit groups each including a plurality of bits; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a modulation symbol, wherein the interleaver is further configured to interleave the LDPC codeword such that a bit included in a predetermined bit group from among the plurality of bit groups constituting the LDPC codeword onto a predetermined bit of the modulation symbol.