16200-Bit LDPC Encoder Layout for Co-Channel Broadcast Reception
Find Innovative SolutionsGenerate Solutions
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 codeword of length 16200 with a code rate of 5/15 is developed, utilizing an LDPC encoding technique that efficiently performs encoding using a sequence derived from a parity check matrix, specifically a circulant permutation matrix, to generate a systematic and parity part, enabling efficient encoding and decoding in overlapping signal areas with co-channel interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a new LDPC codeword with length 16200 and code rate 5/15 is designed, then spectrum efficiency is improved by eliminating white spaces, but device complexity increases due to the need for specialized encoding structures
Solution Approach 1:
The LDPC codeword is segmented into a systematic part (5400 bits) and a parity part (10800 bits), with the parity part further divided into first parity bits (720 bits) and second parity bits (10080 bits). This segmentation allows the encoder to process different portions of the data with appropriate complexity, improving spectrum efficiency while managing device complexity through structured division of the encoding task.
Solution Approach 2:
The patent specifies precise parameters for the LDPC code including codeword length N=16200, information bit length K=5400, code rate 5/15, and parity part lengths (M1=720, M2=10080). These parameter changes optimize the balance between error correction capability and computational complexity, enabling efficient spectrum utilization without excessive device complexity.
2Productivity
If an LDPC encoding technique using a sequence derived from a parity check matrix is implemented, then encoding efficiency is improved for DVB broadcast standard, but manufacturing precision requirements increase for implementing the specific encoding sequence
Solution Approach 1:
The parity check matrix sequence is pre-calculated and stored in the encoder before actual encoding operations. The sequence, which defines the accumulation pattern for generating parity bits from the systematic part, is prepared in advance according to the specified DVB broadcast standard parameters. This preliminary action enables efficient real-time encoding while ensuring precise implementation of the encoding sequence.
3Reliability
If the LDPC code is optimized for terrestrial cloud transmission, then reception robustness is improved in overlap areas, but adaptability to other broadcast standards decreases
Solution Approach 1:
The LDPC code design with N=16200, K=5400, and code rate 5/15 is configured to serve multiple functions: it optimizes performance for terrestrial cloud transmission in overlap areas while maintaining compatibility with DVB broadcast standards. The systematic part length of 5400 and parity part structure are specifically chosen to achieve both reception robustness and standard compliance.
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 16200 and a code rate of 5/15. 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).