OFDM Signal Transmission with Twisted Interleaving and LDPC Decoding
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Solution Overview
Problem
Current digital broadcasting technologies face challenges in efficiently transmitting and receiving signals with high data transmission efficiency, particularly in handling increased data sizes and channel numbers, due to limitations in error correction and modulation schemes.
Innovation Solution
The method involves encoding preamble data using a row-column twisted interleaving scheme, modulating using Orthogonal Frequency Division Multiplexing (OFDM), and decoding with a shortened and punctured LDPC scheme, while maintaining compatibility with existing systems to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional error correction and modulation schemes are used, then system compatibility is maintained, but data transmission efficiency is limited
Solution Approach 1:
The patent applies parameter changes by modifying the interleaving scheme from conventional methods to a specific row-column twisted interleaving pattern with optimized parameters (M=3, N=4). This changes the structural parameters of the transmission system to achieve higher data transmission efficiency while maintaining compatibility through standardized OFDM modulation and LDPC decoding frameworks
2Quantity of substance
If larger data sizes and more channels are transmitted, then service capacity increases, but noise robustness and overhead management become problematic
Solution Approach 1:
The patent applies segmentation by dividing the encoded preamble data into multiple segments that are interleaved in a row-column twisted pattern. This segmentation distributes data across multiple time slots and frequencies, improving noise robustness while enabling larger data sizes and more channels to be transmitted efficiently
Solution Approach 2:
The patent introduces a two-dimensional interleaving structure (row-column twisted fashion) that adds spatial and temporal dimensions to data transmission. This dimensional approach enhances noise robustness by spreading data across multiple dimensions, allowing larger data sizes and more channels while maintaining reliability
3Productivity
If conventional interleaving schemes are used, then implementation is simple, but data transmission efficiency is insufficient
Solution Approach 1:
The patent combines multiple interleaving techniques (row interleaving, column interleaving, and twisting) into a composite row-column twisted interleaving scheme. This composite approach achieves superior data transmission efficiency by integrating the strengths of different interleaving methods while managing complexity through systematic design
Data Source
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AI summary
A real-time image monitoring and recording system includes a plurality of IP cameras and a plurality of surveillance servers. The IP cameras and the surveillance servers can process anycast packets. The surveillance servers control the IP cameras and store data generated by the IP cameras. Peer-to-peer connection exists between the surveillance server and its neighboring surveillance servers. Any surveillance server stores configuration data of its neighboring surveillance servers rather than the configuration data of all the surveillance servers.