Broadcast Signal Framing With Data Pipes for Robust Mobile Reception
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Solution Overview
Problem
Current digital broadcast systems face challenges in efficiently transmitting large amounts of data, ensuring robustness, and flexibility, particularly in mobile reception environments, due to limitations in data transmission efficiency and network robustness.
Innovation Solution
The proposed solution involves encoding DP data using LDPC encoding, bit interleaving, MIMO encoding, and OFDM modulation, with the inclusion of continual pilots based on FFT sizes, allowing for multiplexing of multiple broadcast services within the same RF signal bandwidth and enabling flexible data transmission and reception.
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 HD images and multi-channel audio services are provided, but data transmission efficiency and network robustness need improvement
Solution Approach 1:
The patent segments the broadcast data into multiple data pipes (DP0, DP1, DP2, DP3) that can be independently encoded, modulated, and transmitted. Each data pipe carries specific types of data (e.g., DP0 for video, DP1 for audio, DP2 for additional services, DP3 for signaling), allowing parallel processing and efficient utilization of available bandwidth, thereby improving data transmission efficiency for large amounts of data
Solution Approach 2:
The patent introduces time-domain multiplexing as an additional dimension for data transmission. By arranging data pipes in different time slots within a superframe structure and using time interleaving, the system efficiently utilizes the time dimension to transmit multiple types of data simultaneously, improving overall data transmission efficiency without requiring additional frequency bandwidth
2Quantity of substance
If digital broadcast signals include various types of additional data, then HD images and multi-channel audio services are provided, but network robustness needs improvement
Solution Approach 1:
The patent applies different encoding schemes and modulation strategies to different data pipes based on their specific requirements. For example, video data in DP0 may use more robust encoding with lower code rates, while signaling data in DP3 may use higher rate coding. This localized optimization of transmission parameters for each data type improves overall network robustness while accommodating various types of additional data
Solution Approach 2:
The patent implements forward error correction (FEC) coding and time interleaving as preventive measures against channel errors. The FEC codes add redundancy to the data before transmission, and time interleaving spreads data across multiple time slots, providing cushioning against burst errors. This beforehand protection ensures reliable transmission of various data types including additional services data
3Adaptability or versatility
If broadcast signals are transmitted for mobile reception equipment, then service flexibility is improved, but data transmission efficiency and network robustness need improvement
Solution Approach 1:
The patent implements dynamic resource allocation where data pipes can be flexibly assigned to different services and time slots based on current network conditions and service requirements. The superframe structure allows dynamic adjustment of data pipe configurations, enabling the system to adapt to mobile reception scenarios while maintaining efficient data transmission through optimized coding and modulation parameters
4Adaptability or versatility
If multiple broadcast services are multiplexed in time domain, then service versatility is improved, but system complexity increases
Solution Approach 1:
The patent segments multiple broadcast services into separate data pipes with clear functional assignments (DP0-DP3). Each data pipe is independently processed through encoding, modulation, and mapping, which simplifies the management of multiple services compared to handling them as a single integrated stream. The segmentation approach makes the system more manageable despite the increased versatility
Solution Approach 2:
The patent creates a universal data pipe framework where the same basic structure and processing steps can carry different types of services. The data pipe concept serves multiple functions: it can carry video, audio, additional services, and signaling data using the same transmission infrastructure and processing methodology, reducing overall system complexity through standardization
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals includes encoding DP data according to a code rate, wherein the encoding further includes LDPC encoding the DP data according to the code rate, bit interleaving the LDPC encoded DP data, mapping the bit interleaved DP data onto constellations, MIMO (Multi Input Multi Output) encoding the mapped DP data, and time interleaving the MIMO encoded DP data; building at least one signal frame by arranging the encoded DP data; and modulating data in the built signal frame by OFDM method and transmitting the broadcast signals having the modulated data, wherein the step of modulating includes inserting CPs in the built signal frame based on a CP set which includes information about locations of CPs, wherein the CP set is defined based on FFT size.