OFDM Broadcast Signal Framing for Mobile Reception Robustness
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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 reception.
Innovation Solution
The method involves encoding service data, time interleaving, and modulating it using Orthogonal Frequency Division Multiplexing (OFDM) to transmit broadcast signals efficiently over the same RF signal bandwidth, allowing for flexible service classification and error-free reception even with mobile equipment or in indoor environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast signals transmit large amounts of video/audio data and additional services, then service functionality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments broadcast data into multiple logical channels (transport streams, service streams, elementary streams) that can be independently processed and transmitted. This segmentation allows efficient resource allocation and multiplexing, improving both service functionality and transmission efficiency by enabling selective transmission and prioritization of different data types.
Solution Approach 2:
The patent introduces time-interleaving in the time domain to multiplex multiple logical channels. By distributing data from different channels across multiple time slots, the system achieves efficient utilization of transmission bandwidth while maintaining service functionality, resolving the contradiction between transmitting large amounts of data and maintaining transmission efficiency.
2Adaptability or versatility
If digital broadcast systems provide HD images, multi-channel audio and additional services, then service quality is improved, but robustness of transmission/reception networks deteriorates
Solution Approach 1:
The patent implements error correction coding and time-interleaving before transmission to provide robustness against channel impairments. By preparing error protection mechanisms in advance and distributing data across multiple time slots, the system maintains service quality while improving reliability of transmission and reception, especially for mobile reception equipment.
3Adaptability or versatility
If digital broadcast systems consider mobile reception equipment, then reception flexibility is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent employs dynamic time-interleaving schemes that can adapt to different reception conditions. The system can adjust the time-slot allocation and interleaving depth based on channel characteristics, enabling flexible reception for mobile equipment while maintaining efficient data transmission by optimizing resource allocation according to actual transmission conditions.
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 corresponding to a number of physical paths, a time interleaver to time interleave the encoded service data in each physical path, a frame builder to build at least one signal frame including the time interleaved service data, 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 transmitting the broadcast signals having the modulated data.