LDPC Group-Wise Interleaving for High-Rate Data Transmission
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Solution Overview
Problem
Current data transmission using LDPC codes faces challenges in maintaining high communication quality, particularly in ensuring error-free transmission and avoiding the error floor phenomenon associated with turbo codes.
Innovation Solution
A data processing device and method that performs LDPC coding with a code length of 64800 bits and a coding rate of 13/15, incorporating group-wise interleaving and mapping to specific signal points, which interleave and deinterleave bit groups to enhance transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LDPC coding with code length of 64800 bits and coding rate of 13/15 is used, then error correction capability is improved, but device complexity increases
Solution Approach 1:
The 64800-bit LDPC code is divided into 180 bit groups of 360 bits each. Group-wise interleaving is applied to these bit groups, where the sequence of bit groups is permuted according to a specific pattern (even positions first, then odd positions). This segmentation approach maintains the strong error correction capability of the full-rate LDPC code while reducing implementation complexity by enabling parallel processing of smaller bit groups.
2Reliability
If group-wise interleaving is applied to bit groups of 360 bits, then transmission reliability is improved, but processing time increases
Solution Approach 1:
The bit groups are pre-organized into a specific sequence pattern before transmission. The group-wise interleaving pattern (0, 2, 4, ..., 178, 1, 3, 5, ..., 179) is predetermined and stored as a lookup table. During encoding, bits are simply routed according to this pre-calculated pattern, avoiding complex real-time calculations and reducing processing time while maintaining transmission reliability.
3Productivity
If mapping to signal points is performed in units of 2 bits, then modulation efficiency is improved, but error susceptibility increases
Solution Approach 1:
Different bit groups are mapped to different signal point positions in the constellation diagram based on their group index. Bits from even-positioned groups are mapped to in-phase components while bits from odd-positioned groups are mapped to quadrature components. This local differentiation in mapping strategy optimizes both modulation efficiency and error performance by distributing bits strategically across the signal constellation.
Data Source
AI summary
The present technology relates to a data processing device and a data processing method which can ensure high communication quality in data transmission using LDPC codes, in group-wise interleaving, an LDPC code having a code length N of 64800 bits and a coding rate r of 13/15 is interleaved in a unit of a bit group of 360 bit. In group-wise deinterleaving, a sequence of bit groups of the LDPC code which has been subjected to the group-wise interleaving is returned to an original sequence, the present technology can be applied to, for example, a case in which data transmission is performed using LDPC codes.