Broadcast Signal Framing with Multi-Data Pipes for Robust OFDM
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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 video/audio data and providing mobile reception services.
Innovation Solution
The proposed solution involves a broadcast signal transmission method that formats input streams into multiple data pipes, encodes them using low density parity check (LDPC) codes, performs bit-interleaving and multiple-input multiple-output (MIMO) encoding, and modulates the data using orthogonal frequency division multiplexing (OFDM), while also incorporating diagonal-time-interleaving and frequency-interleaving techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data, then service quality improves, but data transmission efficiency deteriorates
Solution Approach 1:
The transmission system segments data into multiple data pipes (DPs), each carrying different types of broadcast data. This segmentation allows efficient handling of large data volumes by distributing them across multiple organized channels, improving overall transmission efficiency while maintaining high data capacity
Solution Approach 2:
The system employs configurable code rates for LDPC encoding that can be adjusted based on service requirements. By changing the code rate parameter, the system optimizes the balance between data capacity and transmission efficiency for different broadcast services
2Reliability
If multiple encoding and modulation schemes are used, then robustness improves, but device complexity increases
Solution Approach 1:
The system performs bit-interleaving before modulation and diagonal-time-interleving before transmission. These preliminary actions prepare the data in advance to resist channel impairments, improving robustness without requiring complex real-time processing during transmission
Solution Approach 2:
The system dynamically selects code rates and modulation schemes based on channel conditions and service requirements. This dynamic adaptation allows the system to maintain robustness while adjusting complexity to match actual transmission needs
3Adaptability or versatility
If network flexibility is improved for mobile reception, then adaptability improves, but data transmission efficiency deteriorates
Solution Approach 1:
The broadcast system uses universal data pipe structures and encoding schemes that work across both traditional broadcast and mobile reception scenarios. This multi-functionality allows the same system to serve diverse platforms efficiently without sacrificing transmission performance
Solution Approach 2:
The system dynamically adjusts transmission parameters including code rate and modulation depth based on reception conditions. This allows optimal efficiency for stable broadcast reception while maintaining adaptability for mobile scenarios with varying channel conditions
Data Source
AI summary
The present invention provides a method for transmitting a broadcast signal. The method for transmitting the broadcast signal according to the present invention may comprise the steps of: formatting input streams into multiple data pipes (DPs); encoding data of the multiple DPs according to a code rate for each DP; generating at least one signal frame by mapping the encoded data of the multiple DPs; and modulating data of the generated signal frame in an orthogonal frequency division multiplexing (OFDM) scheme, and transmitting the broadcast signal including data of the modulated signal frame.