16200-Length LDPC Encoder Layout for Co-Channel Interference Tolerance
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Solution Overview
Problem
Current terrestrial TV broadcasting systems face significant co-channel interference issues, leading to white spaces where frequency reuse is not possible, resulting in inefficient spectrum use, especially in areas where signal overlap and synchronization are not guaranteed.
Innovation Solution
A new Low Density Parity Check (LDPC) code with a length of 16200 and a code rate of 4/15 is developed, utilizing a specific LDPC encoding technique that includes a systematic part, a dual diagonal matrix, and an identity matrix, with a sequence structure that allows efficient encoding and decoding, specifically designed for terrestrial cloud transmission systems to mitigate co-channel interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terrestrial TV broadcasting uses conventional frequency allocation, then co-channel interference is reduced, but spectrum efficiency deteriorates due to white spaces where frequency cannot be reused
Solution Approach 1:
The patent applies LDPC coding to convert the harmful effect of co-channel interference into a manageable problem through error correction. By using advanced error correction codes, the system can tolerate higher levels of interference, enabling frequency reuse in areas that would previously be white spaces, thus improving spectrum efficiency while maintaining reception robustness
Solution Approach 2:
The patent changes the coding parameters by implementing a specific LDPC code with length 16200 and code rate 4/15. This parameter change enables the system to achieve better error correction performance, allowing frequency reuse in overlapping areas and eliminating white spaces, thereby improving spectrum efficiency without sacrificing reception reliability
2Productivity
If frequency reuse is implemented in overlap areas, then spectrum efficiency improves, but co-channel interference increases requiring robust error correction
Solution Approach 1:
The patent transforms co-channel interference from a limiting factor into a manageable condition by implementing LDPC coding. The error correction capability allows the system to operate in high-interference environments created by frequency reuse, converting the harmful interference into an acceptable parameter that can be corrected through decoding
Solution Approach 2:
The patent applies error correction encoding in advance before transmission. By pre-processing the data with LDPC coding, the system prepares for the expected co-channel interference, enabling the receiver to recover original data even when signals from different transmitters overlap and interfere with each other
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 4/15. 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).