LDPC Bit Mapping in Modulation Symbols for Robust Digital Broadcasting
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Solution Overview
Problem
Current digital broadcasting systems face challenges in providing robust encoding and decoding performance for high-quality digital television and multimedia services, particularly in ensuring reliable transmission and reception of digital signals.
Innovation Solution
A transmitter apparatus and signal processing method that employs Low Density Parity Check (LDPC) coding, interleaving, and modulation to map bits from LDPC codewords onto modulation symbols, optimizing bit arrangement based on the length of the LDPC codeword, modulation method, and code rate for improved decoding and receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional digital broadcasting systems are used, then basic transmission services are provided, but decoding and receiving performance is insufficient for high-quality digital television and multimedia services
Solution Approach 1:
The LDPC codeword is divided into multiple groups (e.g., 360 bits per group), and specific groups are selectively mapped to different bit positions within modulation symbols. This segmentation allows optimized arrangement of codeword bits to improve decoding performance while maintaining manageable system complexity through structured grouping.
Solution Approach 2:
Different groups of LDPC codeword bits are mapped to different bit positions within modulation symbols based on their importance and error protection requirements. This local quality differentiation optimizes the robustness of specific bit groups against channel errors, thereby improving overall decoding performance without uniformly increasing system complexity.
2Reliability
If LDPC coding with optimized bit arrangement is implemented, then decoding and receiving performance is improved, but the complexity of the transmitter apparatus increases
Solution Approach 1:
The transmitter apparatus structures the LDPC codeword into multiple groups and implements a systematic mapping process where specific groups are assigned to predetermined bit positions in modulation symbols. This segmentation approach improves transmission robustness through optimized bit arrangement while organizing the transmitter structure in a modular manner that manages complexity.
Solution Approach 2:
The system adjusts mapping parameters such as the selection of specific LDPC codeword groups and their corresponding bit positions within modulation symbols based on code rate and modulation method. These parameter changes optimize transmission robustness for different operating conditions without requiring fundamental changes to the transmitter apparatus structure.
Data Source
AI summary
A transmitter apparatus and a receiver apparatus are provided. The transmitter apparatus includes: an encoder configured to generate a low density parity check (LDPC) by performing LDPC encoding; an interleaver configured to interleave the LDPC codeword; and a modulator configured to map the interleaved LDPC codeword onto a modulation symbol. The modulator maps a bit included in a predetermined group from among a plurality of groups constituting the LDPC codeword onto a predetermined bit in the modulation symbol.