Variable OFDM Interleaving Seeds for Flexible Broadcast Frames
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, especially when handling large amounts of data and providing high-definition services, particularly in mobile and indoor reception environments.
Innovation Solution
The method involves encoding service data, mapping it into Orthogonal Frequency Division Multiplex (OFDM) symbols, frequency interleaving using a variable interleaving seed based on cyclic shifting and FFT size, and modulating the data for transmission, allowing multiple services to be transmitted through the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast systems 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 variable modulation schemes and coding rates that can be dynamically adjusted based on channel conditions and service requirements. By changing transmission parameters adaptively, the system maintains high data transmission efficiency even when transmitting large amounts of data for multiple services.
2Manufacturing precision
If digital broadcast systems provide HD images and multi-channel audio services, then service quality is improved, but network robustness deteriorates
Solution Approach 1:
The patent applies different error correction codes and modulation schemes to different data pipes based on their specific requirements. Critical data like audio and signaling information receive more robust protection, while video data uses optimized schemes balancing quality and robustness. This local quality approach maintains high service quality while ensuring network robustness.
Solution Approach 2:
The patent implements forward error correction (FEC) coding before transmission, adding redundant data that allows the receiver to correct errors without retransmission. This beforehand cushioning protects against channel impairments and ensures reliable delivery of high-quality HD video and audio data.
3Adaptability or versatility
If digital broadcast systems support various additional services, then service versatility is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent creates a universal data pipe structure that can carry different types of services (video, audio, data services, interactive content) through the same transmission framework. This multi-functionality allows the system to support diverse services efficiently without requiring separate dedicated channels for each service type.
Solution Approach 2:
The patent enables dynamic allocation of data pipe resources and adaptive modulation/coding based on current channel conditions and service demands. This dynamics allows the system to optimize transmission efficiency for each service while maintaining versatility to support multiple service types simultaneously.
4Adaptability or versatility
If digital broadcast systems consider mobile reception equipment, then network flexibility is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent implements dynamic parameter adjustment based on mobile reception conditions, including adaptive modulation, coding rate selection, and data pipe allocation. By continuously adapting to changing channel conditions experienced by mobile devices, the system maintains acceptable transmission efficiency while providing flexible support for mobile reception.
Solution Approach 2:
The patent changes transmission parameters such as modulation order, coding rate, and guard interval length based on detected channel conditions and service requirements. These parameter changes enable the system to maintain data transmission efficiency across varying mobile reception environments while preserving network flexibility.
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data, wherein the different interleaving-seed is generated based on a cyclic shifting value and wherein an interleaving seed is variable based on an FFT size of the modulating.