LDPC Interleaving and Bit Mapping for Better Broadcast Decoding
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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, where existing methods do not adequately support various receiving methods for digital broadcasting.
Innovation Solution
A transmitting apparatus and method that uses an LDPC codeword encoder, interleaver, and modulator to map bits from a predetermined bit group onto a modulation symbol, 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 low, but decoding and receiving performance deteriorates
Solution Approach 1:
The LDPC codeword is divided into multiple bit groups, and each bit group is independently interleaved using different interleaving patterns. This segmentation allows the system to achieve improved decoding performance through diverse bit distribution while maintaining manageable processing complexity by handling each group separately rather than treating the entire codeword as a single unit.
Solution Approach 2:
Different bit groups within the same LDPC codeword are assigned different interleaving patterns, creating local variations in bit distribution characteristics. This local quality approach enables optimized error correction for different parts of the codeword based on their specific requirements, improving overall decoding performance without requiring complete reprocessing of the entire signal.
2Reliability
If simple mapping is used, then processing speed is high, but receiving performance deteriorates
Solution Approach 1:
The interleaving operation is performed on the LDPC codeword before modulation and transmission. This preliminary action prepares the bit sequence in advance with optimized distribution patterns, so that during reception and decoding, the pre-arranged bit groups can be processed more efficiently, improving receiving performance without adding significant processing delay during critical transmission phases.
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 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 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.