Broadcast Signal Time Interleaving for Multiplexed OFDM Services
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in handling large amounts of data and ensuring reliable mobile and indoor reception.
Innovation Solution
The method involves encoding service data, time interleaving, and modulating it using OFDM schemes to transmit broadcast signals, allowing for multiple services to be multiplexed and transmitted through the same RF signal bandwidth, with MIMO systems enhancing robustness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals 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 data into multiple data pipes (transport streams) that can be independently transmitted and managed. Each data pipe carries specific service data or additional data, allowing efficient resource allocation and transmission control for large data volumes without overwhelming the network
Solution Approach 2:
The patent introduces time-domain multiplexing as an additional dimension for data transmission. By transmitting multiple broadcast services and data pipes in different time slots within the same RF signal bandwidth, the system efficiently handles large data amounts while maintaining transmission efficiency
2Adaptability or versatility
If digital broadcast signals include various types of additional data, then service functionality is improved, but network robustness deteriorates
Solution Approach 1:
The patent separates different types of data (video, audio, additional services) into distinct data pipes with independent transmission paths. This segmentation allows the network to maintain robustness by isolating errors to specific pipes while preserving functionality through diverse data types in other pipes
Solution Approach 2:
The patent applies different transmission parameters (modulation schemes, coding rates, time slot allocations) to different data pipes based on their specific requirements. This allows the system to optimize each pipe for its data type while maintaining overall network robustness through parameter diversity
3Manufacturing precision
If the system provides HD images and multi-channel audio, then service quality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent utilizes time-domain multiplexing to transmit multiple high-quality service streams (HD video, multi-channel audio) simultaneously within the same RF bandwidth. By allocating different time slots to different service components, the system maintains high service quality while improving overall transmission efficiency through bandwidth reuse
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals, the apparatus comprises an encoder to encode service data, a time interleaver to interleave the encoded service data, a frame builder to build at least one signal frame including the time interleaved service data, wherein the at least one signal frame includes a plurality of OFDM symbols, a modulator to modulate data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme, and a transmitter to transmit the broadcast signals having the modulated data.