OFDM Broadcast Signal Framing for Robust Multi-Service Transmission
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Solution Overview
Problem
Current digital broadcast systems face challenges in efficiently transmitting and receiving large amounts of data, particularly in providing multiple broadcast services through the same RF signal bandwidth, ensuring robustness and flexibility, especially for mobile and indoor reception.
Innovation Solution
The method involves encoding service data, mapping it into signal frames using Orthogonal Frequency Division Multiplexing (OFDM), and transmitting these signals, allowing for flexible data transmission and reception by classifying data components and managing signaling information effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple broadcast services are transmitted through the same RF signal bandwidth, then transmission efficiency is improved, but signal robustness deteriorates
Solution Approach 1:
The broadcast signal is segmented into multiple frames, with each frame containing data for different services. This allows independent encoding and transmission of each service while sharing the same RF bandwidth, maintaining both efficiency and robustness through structured organization
Solution Approach 2:
Different encoding parameters and modulation schemes are applied to different frames or service data within frames based on their specific requirements. This allows optimization of each service's transmission while maintaining overall system efficiency through parameter adaptation
2Adaptability or versatility
If data is classified by components and transmitted as separate data pipes, then service flexibility is improved, but system complexity increases
Solution Approach 1:
Service data is segmented into distinct components and transmitted through separate data pipes, allowing independent processing and flexible service composition. The receiver can selectively process only the components it needs, reducing effective complexity while maintaining flexibility
Solution Approach 2:
The system employs a universal frame structure and transmission protocol that can carry multiple service components through different data pipes. This standardized multi-functional framework reduces complexity by providing a single interface for handling diverse services
Data Source
AI summary
The present invention provides a method of transmitting broadcast signals, the method including encoding service data, building at least one signal frame by mapping the encoded service data, modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and transmitting the broadcast signals having the modulated data.