64800-Length LDPC Encoding for Co-Channel Interference
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Solution Overview
Problem
Current terrestrial TV broadcasting systems face co-channel interference issues, leading to white spaces where frequency reuse is not possible, resulting in deteriorated spectrum efficiency, and existing LDPC codes are not optimized for the DVB broadcast standard or specific LDPC encoding methods.
Innovation Solution
A new LDPC code with a length of 64800 and code rate of 3/15 is developed, utilizing a quasi-cyclic LDPC encoding technique with a specific sequence and parity check matrix structure, enabling efficient encoding and decoding for terrestrial cloud transmission systems, reducing memory requirements and improving decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional terrestrial TV broadcasting is used, then transmission coverage is achieved, but co-channel interference occurs leading to white spaces and deteriorated spectrum efficiency
Solution Approach 1:
The patent applies parameter changes by optimizing the LDPC code parameters (code length of 64800 and code rate of 3/15) specifically for terrestrial cloud transmission. This involves modifying the parity check matrix structure and using quasi-cyclic encoding to achieve better error correction performance that enables frequency reuse in overlapping coverage areas, thereby improving spectrum efficiency while maintaining reception robustness
2Reliability
If LDPC code with length of 64800 and code rate of 3/15 is used, then error correction capability close to Shannon limit is achieved, but encoding and decoding complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the LDPC encoding process into systematic parts and parity parts, and further segmenting the parity check matrix into quasi-cyclic blocks. This segmentation allows for more manageable processing of the large code length (64800) while maintaining the error correction capability close to the Shannon limit, thereby reducing encoding complexity through structured organization
Solution Approach 2:
The patent uses specific parameter choices (code length 64800, code rate 3/15, quasi-cyclic structure with specific block sizes) that optimize the balance between error correction performance and encoding complexity. These parameter changes enable efficient implementation while achieving near-Shannon-limit performance
Data Source
AI summary
A low density parity check (LDPC) encoder, an LDPC decoder, and an LDPC encoding method are disclosed. The LDPC encoder includes first memory, second memory, and a processor. The first memory stores an LDPC codeword having a length of 64800 and a code rate of 3/15. The second memory is initialized to 0. The processor generates the LDPC codeword corresponding to information bits by performing accumulation with respect to the second memory using a sequence corresponding to a parity check matrix (PCM).