OFDM Broadcast Signal Framing for Multi-Service QoS and Robust 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, especially in mobile and indoor environments, while providing multiple broadcast services over the same RF signal bandwidth.
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, including mobile reception, by classifying data components and managing 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 patent segments the broadcast data into multiple data pipes, each carrying different service data. This segmentation allows independent encoding and modulation of each data pipe, enabling efficient multiplexing of multiple services within the same RF bandwidth while maintaining transmission flexibility and data efficiency.
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 divides broadcast data into component-based data pipes (e.g., video, audio, data services) that can be independently encoded, modulated, and transmitted. This segmentation enables differentiated Quality of Service (QoS) control for each component while using standardized processing blocks that minimize overall system complexity.
3Quantity of substance
If digital broadcast signals are transmitted with large amounts of data, then service quality is improved, but transmission robustness and network flexibility deteriorate
Solution Approach 1:
The patent employs OFDM modulation which transforms the transmission by dividing the data stream into multiple orthogonal subcarriers. This parameter change in the modulation domain allows efficient transmission of large data amounts while maintaining robustness through frequency diversity and resistance to multipath interference.
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 error-free reception of digital broadcast signals, even with mobile equipment, by controlling Quality of Service (QoS) for each service and utilizing Multiple Input Multiple Output (MIMO) systems.
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 lease one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and a transmitter for transmitting the broadcast signals having the modulated data.