LDPC Encoder Sequence Layout for 64800-Length DVB Codewords
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Solution Overview
Problem
Current terrestrial TV broadcasting systems suffer from co-channel interference leading to white spaces, which reduce spectrum efficiency, and existing LDPC codes are not optimized for the DVB broadcast standard, particularly for terrestrial cloud transmission with overlapping signals and varying content.
Innovation Solution
A new LDPC codeword with a length of 64800 and code rate of 7/15, utilizing a sequence-based encoding method that efficiently generates parity bits using a parity check matrix, reducing memory requirements and improving decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new LDPC codeword with length of 64800 and code rate of 7/15 is designed for DVB broadcast standard, then reception robustness and spectrum efficiency are improved, but device complexity and encoding difficulty increase
Solution Approach 1:
The LDPC codeword of length 64800 is divided into multiple blocks or segments that can be processed independently or in parallel. The encoding process is segmented into systematic part generation and parity part generation, allowing modular implementation that reduces overall complexity while maintaining reception robustness.
Solution Approach 2:
The code rate is specifically set to 7/15 and codeword length to 64800, optimizing parameters for DVB broadcast standard. These parameter changes enable better error correction performance and spectrum efficiency while being tailored to the specific requirements of digital terrestrial broadcasting systems.
2Productivity
If LDPC encoding is performed using traditional methods, then encoding can be achieved, but memory requirements and processing time increase
Solution Approach 1:
The parity check matrix and encoding parameters are pre-configured and stored in memory before actual encoding operations. This preliminary preparation allows the encoder to quickly access necessary data during encoding, reducing processing time and memory access overhead during active transmission.
Solution Approach 2:
The essential encoding information is extracted and stored in a compact form in memory, separating the critical parity check matrix elements from the full codeword structure. This extraction allows efficient memory usage by storing only the necessary encoding parameters rather than the entire codeword data.
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 7/15. 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).