LDPC Bit-Group 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 and fail to provide enhanced user experiences.
Innovation Solution
A transmitting apparatus and method that employs LDPC encoding, interleaving, and modulation to map bits from a predetermined bit group of 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 transmission methods are used, then device complexity is reduced, 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 and mapped to modulation symbols. This segmentation allows the receiver to process and decode bit groups independently, improving decoding performance while managing system complexity through modular processing
Solution Approach 2:
An interleaver is introduced as an intermediary component between the LDPC encoder and the modulator. The interleaver rearranges the order of bits within bit groups before modulation, providing diversity gain and improving decoding performance without significantly increasing overall system complexity
2Reliability
If bit mapping is performed without interleaving, then processing speed is improved, but receiving performance deteriorates
Solution Approach 1:
The bit stream is segmented into fixed-size bit groups that are processed independently through interleaving and mapping operations. This segmentation enables parallel processing of multiple bit groups, reducing overall processing time while maintaining the performance benefits of interleaving
Solution Approach 2:
The interleaving operation is performed in advance on bit groups before modulation and transmission. By pre-processing the bit groups with interleaving, the system prepares the data for more robust reception without adding time-critical processing steps during the transmission phase
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.