OFDM Broadcast Signal Framing for QoS-Controlled Multi-Service Delivery
Find Innovative SolutionsGenerate Solutions
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
An apparatus and method utilizing an encoder for encoding service data, a frame builder for mapping encoded data, and a modulator employing Orthogonal Frequency Division Multiplexing (OFDM) to transmit broadcast signals, allowing for flexible data transmission and reception across different service components and signaling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple broadcast services are transmitted through the same RF signal bandwidth, then data transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments broadcast data into multiple data pipes, each carrying different service components (video, audio, metadata). This segmentation allows efficient multiplexing of multiple services within the same RF bandwidth while maintaining manageable system complexity through modular processing at both transmitter and receiver ends.
Solution Approach 2:
The patent implements a universal data pipe structure that can carry various types of broadcast services (HD video, audio, metadata, emergency alerts) through the same transmission framework. This multi-functionality enables the system to transmit multiple services efficiently without requiring separate dedicated systems for each service type.
2Reliability
If robust transmission is ensured for mobile reception equipment and indoor environments, then reliability is improved, but data transmission efficiency decreases
Solution Approach 1:
The patent employs dynamic adaptive modulation and coding schemes that adjust transmission parameters based on channel conditions. In mobile and indoor environments with poor signal quality, the system automatically selects more robust but lower-rate modulation schemes, while in favorable conditions it uses higher-rate schemes to maximize efficiency.
Solution Approach 2:
The patent changes transmission parameters (modulation order, coding rate, guard interval length) dynamically according to channel conditions and service requirements. This allows the system to optimize the balance between reliability and transmission efficiency for different reception scenarios including mobile and indoor environments.
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.