LDPC Code Interleaving for Fading-Channel Burst Error Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LDPC codes are susceptible to burst errors during transmission, particularly in fading channels, due to their structure which separates information bits from parity check bits, making them vulnerable to consecutive symbol fading.
Innovation Solution
Incorporating an interleaver that changes the bit stream order of LDPC codes according to a preset rule before modulation, and a de-interleaver that resumes the original order at the receiver, to improve robustness against burst errors, while maintaining the original functionality of the LDPC codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LDPC codes are transmitted with separate information bits and parity check bits, then the code structure is simple and easy to decode, but the system becomes susceptible to burst errors in fading channels
Solution Approach 1:
The patent applies segmentation by dividing the LDPC codeword into information bits and parity check bits, then applying different interleaving strategies to each segment. The information bits undergo one interleaving process while parity check bits undergo another, allowing the system to maintain the simple separate structure for easy decoding while improving robustness through differential treatment of segments during transmission
Solution Approach 2:
The patent introduces an interleaver as an intermediary component between the encoder and channel. This intermediary reorders the bit stream according to a preset rule, acting as a mediator that transforms the vulnerable sequential structure into a more robust interleaved structure without changing the fundamental LDPC code properties or decoding complexity
2Reliability
If the bit stream order of LDPC codes is changed using an interleaver, then robustness to burst errors is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining and storing the interleaving rule in both transmitter and receiver before transmission begins. The interleaver uses a preset rule that is agreed upon in advance, allowing the complex reordering operation to be performed efficiently using predetermined patterns rather than requiring complex real-time computation during transmission
Solution Approach 2:
The patent changes the parameter of bit stream ordering by applying a specific interleaving pattern. Instead of transmitting bits in their original sequential order, the system transforms the order parameter according to a mathematical rule, converting a simple sequential structure into an interleaved structure that disperses burst errors while maintaining reversibility at the receiver
Data Source
AI summary
A low density parity check code transmission method and device, for use in improving the anti-burst-error capability of a low density parity check code. The method provided by the present application comprises: an interleaver changes the sequence of bit streams of a low density parity check code according to a preset rule, and outputs to a modulator the low density parity check code the sequence of bit streams of which is changed; the modulator modulates the low density parity check code the sequence of bit streams of which is changed and then sends the modulated low density parity check code to a receive end by using a channel.