LDPC Interleaving and Bit Mapping for Robust Digital Broadcasting
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Solution Overview
Problem
Current digital broadcasting systems face challenges in providing robust encoding, decoding, and receiving performance, particularly with the increasing demand for high-quality digital services and diverse receiving methods.
Innovation Solution
A transmitting apparatus and method that includes an LDPC encoder, an interleaver configured to interleave LDPC codewords, and a modulator to map bits from predetermined bit groups onto modulation symbols, utilizing a parity check matrix and specific interleaving techniques to enhance decoding and receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interleaving methods are used for LDPC codewords, then the system can support basic digital broadcasting services, but the decoding and receiving performance is insufficient for high-quality digital services
Solution Approach 1:
The interleaver is divided into multiple functional sections: a first interleaver that performs initial interleaving on the LDPC codeword, and a second interleaver that performs additional interleaving on the output of the first interleaver. This segmentation allows the system to achieve superior decoding performance through multi-stage processing while maintaining manageable complexity by distributing functions across separate modules.
2Adaptability or versatility
If complex interleaving techniques are applied to enhance service quality, then robust encoding and decoding performance is achieved, but the system complexity increases
Solution Approach 1:
The multi-stage interleaving structure is designed to provide universal support for various digital broadcasting services and receiving methods. The same interleaver configuration can handle different service types (standard definition, high definition, portable reception) by adjusting input parameters, making the system versatile without requiring separate specialized structures for each service type.
Data Source
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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 based on a parity check matrix; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a plurality of modulation symbols, wherein the modulator is configured to map bits included in a predetermined bit group from among a plurality of bit groups constituting the LDPC codeword onto a predetermined bit of each of the modulation symbols.