OFDM Broadcast Multiplexing with Data Pipes for Mobile Reception
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and flexibility, particularly in handling large amounts of data and providing high-definition services across various environments, including mobile reception.
Innovation Solution
The method involves encoding service data using a shortening and puncturing scheme based on code rate, mapping data onto constellations, and modulating signal frames using OFDM, allowing for multiplexing of different broadcast services within the same RF signal bandwidth and enabling robust transmission and reception.
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 broadcast data into multiple data pipes (DP0, DP1, DP2, etc.), each carrying different service components. 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 variable code rates and modulation schemes (QPSK, 16-QAM, 64-QAM) that can be dynamically adjusted based on channel conditions and service requirements. This parameter adaptation enables efficient transmission of large data volumes while maintaining optimal transmission efficiency under varying conditions.
2Adaptability or versatility
If digital broadcast signals include various types of additional data, then service functionality is improved, but transmission robustness deteriorates
Solution Approach 1:
Different service data types (video, audio, additional data) are segmented into separate data pipes with dedicated error correction codes. This segmentation allows tailored protection strategies for each data type, maintaining transmission robustness while supporting diverse service functionalities.
Solution Approach 2:
The patent applies forward error correction (FEC) codes and redundancy mechanisms beforehand to protect data before transmission. This pre-protection ensures robustness against transmission errors while allowing the system to carry various types of additional data services.
3Manufacturing precision
If broadcast signals are optimized for high-definition services, then image quality is improved, but reception reliability in mobile and indoor environments deteriorates
Solution Approach 1:
The patent uses adaptive modulation and coding schemes that can switch between different configurations (e.g., QPSK with high code rate for HD content, lower-order modulation for mobile reception). This parameter adaptability allows the system to maintain image quality for HD services while ensuring reliable reception in challenging mobile and indoor environments.
Solution Approach 2:
The transmission system dynamically adjusts its parameters based on channel conditions detected at the receiver. This dynamic adaptation enables the system to optimize between image quality and reception reliability in real-time, particularly for mobile and indoor reception 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 corresponding to each of a plurality of data transmission units, an encoder for encoding physical signaling data by a shortening scheme and a puncturing scheme, a mapper for mapping the encoded service data onto constellations, a frame builder for building at least one signal frame including preamble data, a modulator for modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a transmitter for transmitting the broadcast signals carrying the at least one modulated signal frame.