LDPC Codeword Interleaving for Broadcast Symbol-Bit Mapping
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Solution Overview
Problem
There is a need for improved decoding and receiving performance in digital broadcasting services, particularly in high-quality digital television and portable multimedia systems, due to the increasing demand for efficient data transmission methods.
Innovation Solution
A transmitting apparatus and method that performs LDPC encoding, interleaving, and modulation to efficiently map bits from a low-density parity check (LDPC) codeword onto modulation symbols, using a parity check matrix and an interleaver to enhance decoding and receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional data transmission methods are used in digital broadcasting, then system simplicity is maintained, 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 complex interleaving operation to be applied to manageable units while maintaining overall system performance and enabling parallel processing capabilities.
Solution Approach 2:
The interleaving operation is performed in advance on the LDPC codeword before modulation and transmission. This preliminary action on the bit sequence improves the statistical properties of the transmitted signal, thereby enhancing decoding performance without adding complexity during the critical reception and decoding phases.
2Reliability
If advanced interleaving techniques are applied to LDPC codewords, then receiving performance is improved, but processing complexity increases
Solution Approach 1:
The interleaving process applies different permutation patterns to different bit groups within the LDPC codeword. This local differentiation in processing creates optimal local statistical properties for each bit group while maintaining a systematic overall structure that can be efficiently implemented and reversed at the receiver.
3Productivity
If bit mapping is optimized for specific modulation symbols, then transmission efficiency is improved, but system adaptability deteriorates
Solution Approach 1:
The system employs parameter-based control where the interleaving pattern and bit group processing are adjusted according to modulation order and code rate parameters. This allows the same fundamental architecture to achieve optimized transmission efficiency for specific modulation schemes while maintaining adaptability to different modulation types through parameter reconfiguration rather than structural changes.
Data Source
AI summary
A transmitting apparatus is provided. The transmitting apparatus includes: an encoder configured to perform a low-density parity check (LDPC) encoding on input bits using a parity check matrix to generate an LDPC codeword comprising information word bits and parity 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 modulator is further configured to map a bit included in a predetermined bit group from among a plurality of bit groups constituting the LDPC codeword onto a predetermined bit of the modulation symbol.