Broadcast Signal Processing with PLP Segmentation and Header Compression
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in handling large amounts of data and ensuring reliable mobile reception.
Innovation Solution
The method involves processing input streams into Base Band frames of Physical Layer Pipes, compressing packet headers, encoding data with LDPC codes, and modulating using OFDM, while also employing MIMO encoding and interleaving to transmit and receive broadcast signals effectively across the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional data, then service quality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments data into multiple physical layer pipes (PLPs) with different priorities and characteristics. Each PLP can be independently encoded and transmitted, allowing efficient resource allocation. The segmentation enables parallel transmission of different data types (video, audio, additional data) through dedicated pipes, improving overall transmission efficiency while maintaining high data capacity.
Solution Approach 2:
The patent employs adjustable modulation and coding schemes (MCS) for different PLPs, allowing dynamic parameter changes based on channel conditions and service requirements. By changing coding rates, modulation orders, and pipe priorities, the system optimizes transmission efficiency for varying data amounts and service types without compromising quality.
2Adaptability or versatility
If digital broadcast system provides HD images, multi-channel audio and additional services, then service capability is improved, but robustness of transmission/reception networks deteriorates
Solution Approach 1:
The patent divides services into multiple PLPs with different robustness characteristics. Critical services (audio, essential video data) are assigned to PLPs with higher error protection, while less critical additional data uses PLPs with lower protection. This segmentation allows the system to maintain robustness for core services while supporting diverse service capabilities.
Solution Approach 2:
The patent applies forward error correction (FEC) and interleaving techniques beforehand to protect data before transmission. By pre-applying error protection mechanisms to different PLPs according to their importance, the system ensures robustness against channel impairments while maintaining the ability to provide diverse high-quality services.
3Adaptability or versatility
If digital broadcast system supports mobile reception equipment, then network flexibility is improved, but robustness of transmission/reception networks deteriorates
Solution Approach 1:
The patent implements dynamic PLP configuration and adaptive modulation/coding that can adjust to mobile reception conditions. The system dynamically allocates resources to different PLPs based on channel quality, allowing flexible support for mobile devices while maintaining robustness through adaptive error protection and resource allocation strategies.
Data Source
AI summary
The present invention provides a method of transmitting broadcast signals. The method includes, processing input streams into BB (Base Band) frames of PLPs (Physical Layer Pipes), wherein the input streams include a plurality of input packets, wherein each of the input packets include a packet header including information about synchronization of the input streams, wherein the processing input streams into BB frames further includes compressing the packet headers of the input packets in the input streams, generating the BB frames by using the compressed input packets; encoding data of the PLPs; building at least one signal frame by mapping the encoded data of the PLPs; and modulating data in the built signal frame by OFDM (Orthogonal Frequency Division Multiplexing) method and transmitting the broadcast signals having the modulated data.