Broadcast Signal MIMO Precoding and OFDM Modulation
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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 reception, especially with mobile or indoor equipment.
Innovation Solution
The method involves encoding service data and signaling data, applying MIMO precoding, and modulating using OFDM to transmit broadcast signals, allowing for flexible data transmission and reception across the same RF signal bandwidth, with the ability to classify and process data by service components.
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, each carrying different types of broadcast data (video, audio, additional services). This segmentation allows efficient resource allocation and transmission optimization for different data types, resolving the contradiction between transmitting large amounts of data and maintaining transmission efficiency.
Solution Approach 2:
The patent employs MIMO precoding and OFDM modulation to dynamically adjust transmission parameters such as modulation order, coding rate, and resource allocation. These parameter changes enable adaptive transmission that maintains efficiency while handling variable data volumes and service requirements.
2Adaptability or versatility
If digital broadcast signals include various types of additional data and services, then service diversity and functionality are improved, but network robustness and transmission reliability deteriorate
Solution Approach 1:
The patent divides broadcast data into separate data pipes for different service types (video, audio, additional services). This segmentation isolates critical services from non-critical ones, allowing differential protection strategies that maintain overall network robustness while supporting diverse services.
Solution Approach 2:
The patent implements forward error correction (FEC) and redundancy mechanisms in advance of potential transmission failures. By preparing error correction codes and redundant data paths beforehand, the system maintains reliability even when transmitting diverse and complex service data.
3Adaptability or versatility
If broadcast signals are transmitted to support mobile reception equipment and indoor reception, then reception coverage and accessibility are improved, but signal robustness and transmission reliability deteriorate
Solution Approach 1:
The patent applies MIMO precoding to transmit different signal versions or enhancements tailored to specific reception conditions (mobile vs. fixed, indoor vs. outdoor). This local quality adjustment optimizes signal characteristics for different reception scenarios while maintaining overall system reliability.
Solution Approach 2:
The system dynamically changes transmission parameters including modulation schemes, coding rates, and MIMO configurations based on detected reception conditions. This adaptive parameter adjustment ensures robust signal delivery to mobile and indoor receivers without compromising overall network reliability.
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals, the method comprises encoding service data, encoding signaling data, MIMO (Multiple-Input and Multiple-Output) precoding the encoded service data, building at least one signal frame including the MIMO precoded service data and the encoded signaling data, modulating data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and transmitting the broadcast signals having the modulated data.