LDPC Codeword Interleaving for Better Broadcast Symbol 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 televisions and portable multimedia players, due to the increasing demand for efficient methods to support various receiving methods of digital broadcasting services.
Innovation Solution
A transmitting apparatus and method that performs LDPC encoding, interleaving, and modulation to map bits from a predetermined bit group of a low-density parity-check (LDPC) codeword onto a modulation symbol, using a parity check matrix and an interleaver to enhance decoding and receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encoding and modulation methods are used, then the system is simple to implement, but decoding and receiving performance is insufficient
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 encoding process to be broken down into manageable units while maintaining overall system performance and enabling parallel processing optimizations.
Solution Approach 2:
The interleaver performs preliminary reordering of bits within bit groups before modulation. This preliminary action optimizes the bit arrangement to improve decoding performance by ensuring that bits experiencing similar channel conditions are grouped together, without adding significant complexity to the overall system.
2Reliability
If bits are mapped without interleaving, then the processing is fast and simple, but decoding performance deteriorates due to poor bit distribution
Solution Approach 1:
The interleaver performs preliminary reordering of bits within bit groups before modulation. This preliminary action optimizes the bit arrangement to improve decoding performance by ensuring that bits experiencing similar channel conditions are grouped together, without adding significant complexity to the overall system.
Solution Approach 2:
The system changes the arrangement parameter of bits within bit groups through interleaving. By modifying the bit position parameters according to the interleaving pattern, the system achieves better decoding performance while maintaining efficient processing speeds through standardized interleaving operations.
3Reliability
If all bit groups are processed uniformly, then the processing is simple, but performance is suboptimal for different bit group types
Solution Approach 1:
The interleaver applies different interleaving patterns to different bit groups based on their specific characteristics. This local quality approach allows optimization of each bit group's arrangement according to its role in the codeword (e.g., information bits vs. parity bits), improving overall receiving performance without requiring completely different processing for each group.
Solution Approach 2:
The system changes the arrangement parameter of bits within bit groups through interleaving. By modifying the bit position parameters according to the interleaving pattern, the system achieves better decoding performance while maintaining efficient processing speeds through standardized interleaving operations.
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.