OFDM Broadcast Signal Framing for Robust MIMO Reception
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in transmitting large amounts of data and ensuring reliable reception, especially with mobile or indoor equipment.
Innovation Solution
The method involves encoding service data, bit interleaving, and mapping it into OFDM symbols for modulation, allowing for transmission of multiple broadcast services through the same RF signal bandwidth using MIMO systems, enhancing data transmission efficiency and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast systems transmit large amounts of video/audio data and additional data, then service quality and functionality are improved, but data transmission efficiency and network robustness deteriorate
Solution Approach 1:
The patent segments broadcast data into multiple transport streams, each carrying different service components (video, audio, data). These segmented streams are then multiplexed onto a single RF channel, enabling efficient transmission of large data volumes while maintaining manageable transmission efficiency for each segment.
Solution Approach 2:
The patent creates a universal broadcast transmission system that can carry multiple service types (HD video, multi-channel audio, data services) through a unified RF signal structure. The single RF channel serves multiple functions by transporting diverse data streams simultaneously via time-division multiplexing.
2Reliability
If digital broadcast systems provide HD images, multi-channel audio and additional services, then service quality is improved, but transmission robustness and network flexibility worsen
Solution Approach 1:
The patent implements dynamic service component mapping where service components can be flexibly assigned to different transport streams and time slots. The system can dynamically adjust which services are transmitted in which time periods, enabling both high service quality and adaptable network flexibility for mobile reception scenarios.
Solution Approach 2:
The patent changes transmission parameters by using time-division multiplexing with variable time slot allocations for different service components. This allows the system to maintain high service quality for fixed reception while providing network flexibility for mobile reception by adjusting the timing and composition of transmitted service components.
3Adaptability or versatility
If multiple broadcast services are transmitted through the same RF signal bandwidth, then transmission flexibility is improved, but signal complexity increases
Solution Approach 1:
The patent merges multiple broadcast services into a single multiplexed RF signal by combining segmented transport streams in the time domain. This merging approach achieves transmission flexibility for delivering multiple services while managing signal complexity through systematic multiplexing rather than transmitting separate RF signals for each service.
Solution Approach 2:
The patent transitions from frequency-division multiplexing to time-division multiplexing, moving services into the time domain dimension. This dimensional change allows multiple services to share the same RF bandwidth without requiring complex frequency management, thereby improving transmission flexibility while controlling signal complexity through time-based separation.
4Productivity
If data is classified by components and transmitted as separate data pipes, then data management efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent segments service data into distinct service components (video, audio, data) organized as separate data pipes or transport streams. This segmentation improves data management efficiency by enabling independent handling and prioritization of different service types while managing processing complexity through standardized segmentation rules and clear component identification.
Data Source
AI summary
The present invention provides an apparatus of transmitting broadcast signals. The apparatus includes, an encoder for encoding service data, a bit interleaver for bit interleaving the encoded service data, a mapper for mapping the bit interleaved service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, an OFDM modulator for modulating data in the built at least one signal frame by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data.