LDPC Parity Group Interleaving for Variable-Length Signaling
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Solution Overview
Problem
Existing channel encoding and modulation techniques for signaling information in broadcast systems are not robust enough, necessitating improved methods for efficient transmission.
Innovation Solution
A parity interleaving apparatus and method that segments parity bits of an LDPC codeword into groups and applies group-wise interleaving, optimized for signaling information transmission, including zero-padding and puncturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel encoding and modulation techniques are used for signaling information transmission, then the transmission process is simple, but the robustness and reliability of transmission deteriorates
Solution Approach 1:
The parity bits are segmented into multiple groups (first parity bit group, second parity bit group, third parity bit group) with different puncturing rates applied to each group. This segmentation allows differential protection levels for different portions of parity information, improving overall transmission robustness while managing complexity through structured organization
Solution Approach 2:
Different puncturing rates are applied to different parity bit groups based on their importance. The first parity bit group uses a first puncturing rate, the second group uses a second puncturing rate, and the third group uses a third puncturing rate. This local differentiation optimizes reliability for critical signaling information while controlling overall system complexity
2Productivity
If parity bits are not punctured, then transmission reliability is maintained, but transmission efficiency and bandwidth utilization deteriorates
Solution Approach 1:
Instead of transmitting all parity bits or none, the invention applies partial puncturing with different rates to different parity groups. This partial action approach removes only the least critical parity bits (third group with highest puncturing rate) while preserving more robustly protected parity bits (first group with lowest puncturing rate), achieving optimal balance between efficiency and reliability
Solution Approach 2:
The invention changes the puncturing rate parameter differently for each parity bit group. By varying the puncturing rate parameter across groups (first rate < second rate < third rate), the system adapts the transmission efficiency-reliability tradeoff to the specific requirements of different parity information portions
3Stability of the object's composition
If variable-length signaling information is transmitted without zero-padding, then information fidelity is preserved, but encoding and transmission process becomes inconsistent
Solution Approach 1:
Zero-padding is performed preliminarily on variable-length signaling information before LDPC encoding to standardize the input length. This preliminary action ensures that the encoding process receives consistent fixed-length input, improving encoding consistency and stability while the actual signaling information content remains intact for recovery at the receiver
Data Source
AI summary
A parity interleaving apparatus and method for variable length signaling information are disclosed. A parity interleaving apparatus according to an embodiment of the present invention includes a processor configured to generate a parity bit string for parity puncturing by segmenting parity bits of an LDPC codeword whose length is 16200 and whose code rate is 3/15, into a plurality of groups, and group-wise interleaving the groups using an order of group-wise interleaving; and memory configured to provide the parity bit string for parity puncturing to a parity puncturing unit.