OFDM Broadcast Frame Multiplexing for Robust Multi-Service 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 and indoor reception, as they struggle to multiplex multiple services within the same RF signal bandwidth.
Innovation Solution
An apparatus that includes 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 across different services and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple broadcast services are transmitted using conventional digital broadcast systems, then data transmission capacity increases, but transmission efficiency and robustness deteriorate due to inability to multiplex services within the same RF signal bandwidth
Solution Approach 1:
The patent introduces time-domain multiplexing as an additional dimension for service transmission. By assigning different services to different time slots within the same RF bandwidth, the system achieves multi-service capability without sacrificing transmission efficiency. The frame structure divides transmission time into multiple slots, allowing simultaneous transmission of multiple services through time division.
Solution Approach 2:
The patent segments the broadcast data into multiple service components that can be independently processed and transmitted. Each service is divided into manageable data units that are mapped to specific time slots and frequency resources. This segmentation enables flexible resource allocation and improves overall system efficiency by allowing selective transmission of different service components.
2Adaptability or versatility
If digital broadcast systems transmit large amounts of video/audio data and additional services, then service functionality increases, but transmission robustness and network flexibility deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation where transmission parameters such as modulation schemes, coding rates, and time slot assignments can be adjusted based on channel conditions and service requirements. This dynamic adaptation allows the system to maintain robustness under varying conditions while supporting diverse service functionalities. The frame structure allows flexible reconfiguration of resource allocation for different services.
Solution Approach 2:
The patent applies different transmission qualities and protection levels to different service components based on their specific requirements. Critical services receive higher protection levels and more robust coding, while less critical services use more efficient but less protected transmission modes. This localized quality adjustment optimizes the balance between service functionality and transmission robustness.
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 solution enables efficient data transmission and reception of various broadcast services with improved Quality of Service (QoS) and robustness, supporting mobile and indoor reception by multiplexing data across the same RF signal 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 lease one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and a transmitter for transmitting the broadcast signals having the modulated data.