Broadcast Signal OFDM Framing for Virtual Channel Service Delivery
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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 reception equipment and indoor environments.
Innovation Solution
The system employs an encoder for service data, a frame builder for signal framing, and a modulator using Orthogonal Frequency Division Multiplexing (OFDM) to transmit broadcast signals, allowing for flexible data transmission and reception by classifying data components and signaling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple broadcast services are transmitted through the same RF signal bandwidth, then transmission flexibility and bandwidth utilization are improved, but data transmission efficiency and signal robustness deteriorate
Solution Approach 1:
The broadcast signal is segmented into multiple virtual channels, each carrying different service data streams. The transmitter divides the RF bandwidth into multiple logical channels through virtual channel mapping, allowing independent modulation and coding for each service type. This segmentation enables multiple services to coexist in the same RF bandwidth while maintaining their respective transmission efficiency and robustness characteristics.
2Reliability
If data is classified by components and transmitted as separate data pipes, then service quality control is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal data pipe structure that can carry multiple types of service data (video, audio, metadata, etc.) through a common transmission framework. Each data pipe is designed with multi-functional capabilities to handle different service components while maintaining a standardized interface. This universal structure simplifies the overall system complexity compared to having separate dedicated transmission paths for each service type, while still enabling quality control through selective modulation and coding parameters for each data pipe.
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 flexible broadcast service delivery through the same RF bandwidth, ensuring reliable digital broadcast signal transmission even with mobile or indoor reception.
Implementation Method 1
a modulator for modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme
Data Source
AI summary
The present invention provides an apparatus of transmitting broadcast signals, the apparatus including, an encoder for encoding service data, a frame builder for building at least one signal frame by mapping the encoded service data, a modulator for modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and a transmitter for transmitting the broadcast signals having the modulated data.