LDPC Bit-Group Mapping to Modulation Symbols for Better Decoding
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Solution Overview
Problem
There is a need for improved methods to support high decoding and receiving performance in digital broadcasting services, particularly in a multi-channel, wideband, and high-quality digital environment, where existing technologies fall short in providing efficient data transmission and reception.
Innovation Solution
A transmitting apparatus and method that employs LDPC encoding, interleaving, and modulation to efficiently map and transmit bits, using a parity check matrix and interleavers to optimize bit grouping and ordering, thereby enhancing decoding and receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transmission methods are used in digital broadcasting, then basic data transmission is achieved, but decoding and receiving performance is insufficient for high-quality multi-channel services
Solution Approach 1:
The LDPC codeword is divided into multiple bit groups, and each bit group is separately interleaved and mapped to specific bit positions in modulation symbols. This segmentation approach improves decoding performance by enabling granular control over bit distribution while managing complexity through modular processing of smaller bit group units.
Solution Approach 2:
Different bit groups are mapped to different bit positions within modulation symbols based on their specific characteristics and error protection requirements. This local quality approach optimizes the mapping strategy for each bit group individually, enhancing overall receiving performance by tailoring the transmission strategy to local needs rather than applying a uniform approach.
2Reliability
If bit groups are interleaved and mapped to specific modulation symbol bits, then bit error rate and frame error rate are reduced, but the processing complexity increases
Solution Approach 1:
The interleaving and mapping strategy is predetermined based on the LDPC code structure and modulation scheme. Bit groups are pre-assigned to specific bit positions in modulation symbols according to predefined patterns, which reduces processing complexity during actual transmission by eliminating the need for dynamic decision-making while maintaining optimal error performance.
Solution Approach 2:
The interleaving and mapping parameters are optimized based on code rate, modulation order, and bit group size. By adjusting these parameters according to specific transmission conditions, the system achieves improved error rates without proportionally increasing complexity, as the optimized parameters enable more efficient processing configurations.
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 of input bits based on a parity check matrix including information word bits and parity bits, the LDPC codeword including a plurality of bit groups each including a plurality of 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 interleaver is further configured to interleave the LDPC codeword such that a bit included in a predetermined bit group from among the plurality of bit groups constituting the LDPC codeword onto a predetermined bit of the modulation symbol.