OFDM Broadcast Signal Framing for Multi-Service Robust Reception
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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
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 services and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple broadcast services are transmitted through the same RF signal bandwidth, then transmission efficiency and spectrum utilization are improved, but data transmission robustness and reliability deteriorate
Solution Approach 1:
The transmission system segments data into multiple transport streams, each assigned to different time slots or frequency resources within the RF bandwidth. This segmentation allows multiple services to share the spectrum while maintaining individual service reliability through dedicated resource allocation and error correction coding for each segment.
Solution Approach 2:
The system dynamically allocates time-frequency resources and adjusts modulation schemes based on channel conditions for each service. This dynamic adaptation enables the system to maintain robustness for critical services while maximizing overall transmission efficiency by optimizing resource distribution in real-time.
2Adaptability or versatility
If digital broadcast systems transmit large amounts of video/audio data and additional services, then service functionality and content richness are improved, but data transmission efficiency and network robustness deteriorate
Solution Approach 1:
The broadcast system employs a universal transport stream framework that can carry multiple types of content (video, audio, data services) through a common transmission infrastructure. This multi-functional approach allows diverse services to be delivered efficiently through standardized encoding, multiplexing, and transmission protocols, improving overall data transmission efficiency while maintaining service versatility.
Solution Approach 2:
The system dynamically changes transmission parameters such as modulation order, code rate, and resource allocation based on service requirements and channel conditions. This parameter adaptation enables efficient transmission of large data volumes by optimizing the balance between data rate and error protection for different service types.
3Adaptability or versatility
If digital broadcast systems provide HD images, multi-channel audio and additional services, then service quality and content diversity are improved, but transmission bandwidth requirements and system complexity increase
Solution Approach 1:
The system merges multiple high-quality service streams (HD video, multi-channel audio, data services) into a unified transport structure with standardized processing chains. This consolidation reduces system complexity by using common encoding, error correction, and transmission mechanisms for all service types while maintaining the quality and diversity of individual services.
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 enables efficient data transmission and reception of various broadcast services with improved Quality of Service (QoS) control, increased robustness, and flexibility, ensuring error-free digital broadcast signal transmission even with mobile or indoor reception equipment.
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.