OFDM Broadcast Frame Mapping for Mobile and Indoor 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 for mobile reception and indoor environments, while providing multiple broadcast services over the same RF signal bandwidth.
Innovation Solution
An apparatus and method that utilize an encoder for encoding service data, a frame builder for mapping encoded data, and a modulator using Orthogonal Frequency Division Multiplexing (OFDM) to transmit broadcast signals, allowing for flexible data transmission and reception, including mobile and indoor reception, by classifying data components and transmitting signaling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast systems transmit large amounts of video/audio data and additional services, then service functionality 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 efficient resource allocation and transmission optimization for each data type, resolving the contradiction between transmitting large amounts of data and maintaining transmission efficiency.
2Adaptability or versatility
If digital broadcast systems provide multiple broadcast services, then service versatility is improved, but network robustness deteriorates
Solution Approach 1:
The patent divides broadcast services into separate data pipes with independent transmission paths. This segmentation isolates service failures, ensuring that problems in one service do not affect others, thereby maintaining network robustness while supporting multiple services.
Solution Approach 2:
The patent dynamically adjusts transmission parameters (modulation schemes, coding rates) for different data pipes based on channel conditions and service requirements. This adaptability allows the system to maintain robustness across multiple services by optimizing each pipe's parameters according to its specific needs.
3Quantity of substance
If digital broadcast systems increase data transmission capacity, then service functionality is improved, but transmission reliability deteriorates
Solution Approach 1:
The patent employs different modulation and coding schemes for different data pipes based on their priority and channel conditions. High-priority data uses more robust schemes, while lower-priority data uses higher-capacity schemes, resolving the contradiction between capacity and reliability through parameter optimization.
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, including in mobile and indoor environments, while providing various broadcast services over the same RF bandwidth.
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.