Broadcast Signal Transmission Using Time Interleaving and OFDM
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and flexibility, particularly in handling large amounts of data and ensuring reliable reception, especially with mobile or indoor equipment.
Innovation Solution
The method involves encoding service data, time interleaving, and modulating it using OFDM, allowing for the transmission of multiple broadcast services through the same RF signal bandwidth, with advanced error correction and signaling mechanisms to ensure quality of service and robustness.
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 data into multiple transport streams, each carrying different service components (video, audio, additional services). This segmentation allows independent optimization of each stream's transmission parameters, improving overall transmission efficiency while maintaining high data volumes for HD video and multi-channel audio.
Solution Approach 2:
The patent introduces time-domain multiplexing as an additional dimension for data transmission. By organizing data into time-division multiplexed frames with specific structures (including synchronization sections and service data sections), the system efficiently handles large data volumes across multiple services without compromising transmission efficiency.
2Quantity of substance
If digital broadcast systems provide HD images, multi-channel audio and additional services, then service quality is improved, but network robustness deteriorates
Solution Approach 1:
The patent incorporates synchronization sections at the beginning of each transport stream that contain advance information about the stream structure, service types, and data organization. This preliminary action allows receivers to properly configure error correction and data processing before the actual service data arrives, enhancing robustness for HD video and audio transmission.
Solution Approach 2:
The patent implements error correction coding and redundancy mechanisms in advance of data transmission. The transport stream structure includes dedicated sections for error correction data and retransmission information, providing a cushion against transmission errors that may occur when broadcasting large volumes of HD video and audio data.
3Adaptability or versatility
If digital broadcast systems support mobile reception equipment, then accessibility is improved, but reception reliability deteriorates
Solution Approach 1:
The patent implements dynamic synchronization mechanisms that allow the broadcast system to adapt to mobile reception conditions. The synchronization sections contain adjustable parameters that can be modified in real-time based on channel conditions, enabling reliable reception for mobile devices while maintaining support for various service types.
Solution Approach 2:
The patent employs parameter changes in the transport stream structure to optimize for mobile reception. By dynamically adjusting modulation parameters, coding rates, and frame structures based on channel conditions, the system maintains reception reliability for mobile equipment while continuing to provide HD video, audio, and additional services.
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 reliable broadcast signal reception even with mobile or indoor equipment, providing flexible and high-quality digital broadcast services.
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, the apparatus comprises an encoder to encode service data, a mapper to map the encoded service data, a time interleaver to time interleave the mapped service data, wherein the time interleaving is performed depending on number of physical paths for the service data, a frame builder to build at least one signal frame including the time interleaved service data, a modulator to modulate data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter to transmit the broadcast signals having the modulated data.