Broadcast Signal Transmission Using Frequency Interleaving
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, especially when handling large amounts of data and providing high-definition services, particularly in mobile and indoor environments.
Innovation Solution
The method involves encoding service data, mapping it into OFDM symbols, performing frequency interleaving using different interleaving seeds for each OFDM symbol pair, and modulating the data using an OFDM scheme to transmit broadcast signals through the same RF signal bandwidth, allowing for flexible and robust transmission and reception of multiple services.
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 the broadcast data stream into multiple logical channels (LCs), each carrying different types of data (video, audio, additional data). This segmentation allows efficient resource allocation and transmission optimization for different data types, improving overall transmission efficiency while maintaining high data capacity
Solution Approach 2:
The patent employs multi-carrier modulation (OFDM) to transmit data across multiple frequency dimensions simultaneously. By dividing the data stream into parallel sub-carriers, the system achieves high data transmission efficiency through frequency-domain parallel processing, resolving the contradiction between large data volume and transmission efficiency
2Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional data, then service quality and functionality are improved, but network robustness deteriorates
Solution Approach 1:
The patent implements forward error correction (FEC) coding before data transmission, adding redundant error correction codes to the data stream. This beforehand cushioning protects against transmission errors and signal degradation, maintaining network robustness even when transmitting large amounts of data over challenging channels
Solution Approach 2:
The patent dynamically adjusts transmission parameters including modulation order, coding rate, and guard interval based on channel conditions. By changing these parameters adaptively, the system maintains robust transmission reliability while accommodating large data volumes, resolving the contradiction between data quantity and network robustness
3Adaptability or versatility
If the system provides HD images, multi-channel audio and various additional services, then service diversity and quality are improved, but device complexity increases
Solution Approach 1:
The patent designs a universal broadcast signal structure that can carry multiple service types (HD video, multi-channel audio, additional data) through a unified framework of logical channels and transport streams. This multi-functional design allows a single transmission system to deliver diverse services without requiring separate dedicated systems for each service type, managing complexity while maximizing versatility
4Adaptability or versatility
If the system considers mobile reception equipment, then reception flexibility is improved, but transmission robustness deteriorates
Solution Approach 1:
The patent implements dynamic parameter adjustment capabilities where transmission parameters (modulation scheme, coding rate, guard interval) are adapted in real-time based on channel conditions and receiver capabilities. This dynamic adaptation maintains robustness for mobile receivers experiencing varying channel conditions while preserving reception flexibility across different device types and scenarios
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data.