Broadcast Signal Data Pipe Framing for Robust OFDM Reception
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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 providing high-definition services, especially with mobile reception equipment.
Innovation Solution
The implementation of a method for transmitting and receiving broadcast signals using Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) systems, which allows for multiplexing data from multiple services into a single RF signal bandwidth, enabling efficient data transmission and reception with improved robustness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional services, then service quality and functionality are improved, but data transmission efficiency and network robustness deteriorate
Solution Approach 1:
The patent segments broadcast data into multiple data pipes, each carrying different types of data (video, audio, additional services). This segmentation allows independent optimization of transmission parameters for each data type, improving overall transmission efficiency while maintaining high data volumes for HD video and multi-channel audio.
Solution Approach 2:
The patent employs OFDM modulation which changes the transmission parameter from single-carrier to multi-carrier frequency division multiplexing. This parameter change enables efficient transmission of large data volumes by dividing the bandwidth into multiple orthogonal subcarriers, each carrying modulated data symbols, thereby improving data transmission efficiency for high-definition services.
2Quantity of substance
If digital broadcast signals include HD images, multi-channel audio and additional services, then service quality is improved, but network robustness deteriorates
Solution Approach 1:
The patent implements forward error correction (FEC) coding before data transmission, adding redundant parity bits to the data payload. This beforehand cushioning protects the robustness of HD video, multi-channel audio, and additional services by enabling error detection and correction at the receiver, ensuring reliable delivery of large data volumes over noisy broadcast channels.
Solution Approach 2:
The patent divides the broadcast data into multiple transport streams and further segments them into data pipes with different priority levels and error protection schemes. Critical data (video, audio) receives stronger FEC protection, while additional services use lighter protection, optimizing the balance between data volume transmission and network robustness for each service type.
3Adaptability or versatility
If digital broadcast system provides HD images and additional services, then service functionality is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent creates a universal broadcast framework where a single OFDM physical layer infrastructure supports multiple service types (HD video, multi-channel audio, data services, interactive services). The data pipe architecture provides multi-functionality by allowing flexible configuration of transmission parameters, modulation schemes, and error protection levels to accommodate diverse service requirements within the same broadcast stream, maintaining transmission efficiency across different service functionalities.
4Productivity
If broadcast signals are optimized for high data transmission, then service quality is improved, but robustness for mobile reception deteriorates
Solution Approach 1:
The patent implements dynamic adaptation of transmission parameters including modulation order, code rate, and guard interval length based on channel conditions. For mobile reception scenarios with time-varying channels, the system dynamically adjusts these parameters to maintain both data transmission efficiency and robustness, allowing HD video and audio services to be delivered reliably under varying mobility conditions.
Solution Approach 2:
The patent uses OFDM with configurable subcarrier spacing and guard intervals to adapt to different mobility scenarios. By changing these parameters, the system maintains robustness for mobile reception while preserving data transmission efficiency for high-definition services, overcoming the trade-off between efficiency and robustness in mobile environments.
Data Source
AI summary
A method and an apparatus for receiving broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse a signal frame from the demodulated broadcast signals, a time deinterleaver to time deinterleave data in the parsed signal frame and a decoder to decode the time deinterleaved data.