LDPC Encoding for Broadcast Signal Transmission Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current digital broadcast signal transmission technologies face challenges in data transmission efficiency, robustness, and flexibility, particularly in handling large amounts of video/audio data and providing mobile reception capabilities.
Innovation Solution
The method involves encoding Data Pipe (DP) data using Low-Density Parity-Check (LDPC) codes, bit interleaving, and mapping onto constellations, followed by Orthogonal Frequency Division Multiplexing (OFDM) modulation, with specific parity check matrices and code rates to transmit broadcast signals efficiently, including Emergency Alert System (EAS) information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signal transmission is used to provide HD images and multi-channel audio, then the amount of video/audio data increases, but data transmission efficiency decreases
Solution Approach 1:
The broadcast signal is segmented into multiple Data Pipes (DPs), where each DP carries specific types of data (e.g., video, audio, subtitles). This segmentation allows for independent encoding and transmission optimization for different data types, improving overall transmission efficiency while handling large data volumes.
Solution Approach 2:
The patent employs Low-Density Parity-Check (LDPC) encoding with variable code rates to adapt the transmission parameters according to channel conditions and data requirements. By changing encoding parameters dynamically, the system maintains high transmission efficiency while accommodating large amounts of HD video and audio data.
2Reliability
If robustness of transmission/reception networks is improved for mobile reception equipment, then network flexibility increases, but device complexity increases
Solution Approach 1:
The system performs preliminary channel estimation and equalization before data reception, preparing the reception chain in advance for mobile conditions. This preliminary action enables the receiver to adapt to changing channel conditions without increasing real-time processing complexity.
Solution Approach 2:
The patent introduces intermediate processing stages including pilot signal insertion and channel estimation blocks that mediate between the physical channel and the data reception process. These intermediaries simplify the overall receiver design by handling complex robustness requirements in dedicated functional blocks.
Data Source
AI summary
A method for transmitting broadcast signals by an apparatus for transmitting broadcast signals, the method includes encoding service data according to a 16200 bit codeword and a 11/15 code rate based on addresses in a parity check matrix, wherein the encoded service data comprises information bits and parity bits; building at least one signal frame by mapping the encoded service data; modulating data in the built signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) scheme; and transmitting broadcast signals having the modulated data, wherein the encoding of the service data comprises: initializing the parity bits, adding the information bits to the parity bits of which addresses are based on values of entries in each row of the parity check matrix, wherein a row of the parity check matrix corresponds to a 360 bit group of the information bits.