Broadcast Signal Transmission Using NUQ Modulation and Data Segmentation
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Solution Overview
Problem
Current digital broadcast signal transmission technologies face challenges in data transmission efficiency, robustness, and network flexibility, especially in mobile and indoor environments, due to the large amount of video/audio data and additional services required for high-definition images and multi-channel audio.
Innovation Solution
The method involves encoding service data using QAM, NUQ, or NUC, mapping it into OFDM symbols, and modulating the data for transmission through a MIMO system to achieve transmission flexibility and robustness, allowing for multiple services over the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital broadcast signals transmit large amounts of video/audio data for HD images and multi-channel audio, then service quality is improved, but data transmission efficiency deteriorates
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 each data pipe's transmission parameters, improving overall transmission efficiency while maintaining high service quality through dedicated bandwidth allocation for each data type.
Solution Approach 2:
The patent employs variable modulation schemes (QAM, NUQ, NUC) and adaptive coding parameters that can be changed dynamically based on channel conditions and service requirements. This allows the system to optimize transmission efficiency for different data types and channel states while maintaining reliable HD video and audio transmission.
2Adaptability or versatility
If digital broadcast signals include various additional services, then service diversity is improved, but network robustness deteriorates
Solution Approach 1:
The patent divides additional services into separate data pipes with independent error protection and transmission parameters. This segmentation ensures that failures or interference affecting one service type do not propagate to others, maintaining network robustness while supporting diverse services including data broadcasting, interactive services, and emergency alerts.
Solution Approach 2:
The patent implements forward error correction (FEC) and redundancy mechanisms in advance for each data pipe carrying different services. This beforehand cushioning protects against channel errors and interference, ensuring robust transmission of diverse services including HD video, audio, and additional data services simultaneously.
3Adaptability or versatility
If broadcast signals are transmitted for mobile reception equipment, then reception flexibility is improved, but signal robustness deteriorates
Solution Approach 1:
The patent implements dynamic parameter adjustment for mobile reception, including adaptive modulation schemes (QAM, NUQ, NUC) and variable coding rates that can be changed in real-time based on detected channel conditions. This dynamics allows the system to maintain robust signal transmission while adapting to the varying reception environments of mobile devices.
Solution Approach 2:
The patent changes transmission parameters such as modulation order, coding rate, and data pipe allocation dynamically based on mobile receiver feedback and channel quality indicators. These parameter changes enable the system to optimize between reception flexibility for different mobile scenarios and signal robustness against mobile channel impairments like Doppler shift and fading.
Data Source
AI summary
The present invention provides an apparatus of transmitting broadcast signals. The apparatus includes, an encoder encoding service data, a constellation mapper mapping the encoded service data by either QAM, NUQ (Non Uniform QAM) or NUC (Non Uniform Constellation), a mapper mapping the mapped service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a modulator modulating data in the built at least one signal frame by an OFDM scheme and a transmitter transmitting the broadcast signals having the modulated data.