Broadcast Signal Transmission Using Time Interleaved Data Pipes
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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 mobile reception, especially with the transition from analog to digital broadcast signals.
Innovation Solution
The method involves encoding data pipes corresponding to multiple services, mapping encoded data onto constellations, performing time interleaving by skipping zero-value cells, building signal frames, and modulating data using an OFDM scheme for transmission, allowing for multiple services to be transmitted through 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 and functionality are improved, but data transmission efficiency and network robustness deteriorate
Solution Approach 1:
The patent segments broadcast data into multiple data pipes (DP0, DP1, DP2, etc.), each carrying different service components. This segmentation allows independent processing, encoding, and transmission of different data streams, improving overall transmission efficiency while handling large data volumes through parallel processing.
Solution Approach 2:
The patent introduces time-interleaving in the time domain to multiplex multiple data pipes. By allocating different time slots to different data pipes and using time-domain multiplexing, the system efficiently transmits multiple services simultaneously without interfering with each other, thus improving data transmission efficiency.
2Adaptability or versatility
If digital broadcast signals include various types of additional data, then service functionality is improved, but transmission robustness deteriorates
Solution Approach 1:
The patent applies different encoding schemes and error correction parameters to different data pipes based on their specific requirements. For example, audio data may use more robust encoding than text data, allowing each service component to have optimized transmission characteristics suitable for its nature, thereby maintaining robustness while supporting diverse services.
3Adaptability or versatility
If the system supports mobile reception equipment, then network flexibility is improved, but transmission robustness deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation and adaptive modulation across multiple data pipes. The system can dynamically adjust transmission parameters, allocate bandwidth, and adapt to changing channel conditions in real-time, providing both flexibility for mobile reception and robustness through adaptive error correction and retransmission mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances data transmission efficiency, improves robustness, and enables flexible transmission of various broadcast services, including high-definition images and multi-channel audio, even with mobile reception equipment, by controlling Quality of Service (QoS) for each service and utilizing MIMO systems.
Implementation Method 1
modulating data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and transmitting the broadcast signals having the modulated data
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 Data Pipe (DP) data corresponding to each of a plurality of DPs, wherein each of a plurality of DPs carries at least one service component, a mapper for mapping the encoded DP data onto constellations, a time interleaver for time interleaving (TI) the mapped DP data at DP level by skipping cells having zero values of the DP data, a frame builder for building at least one signal frame including the time interleaved DP data, a modulator for modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplex (OFDM) scheme and a transmitter for transmitting the broadcast signals having the modulated data.