Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
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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 multiple services, particularly in mobile and indoor reception environments.
Innovation Solution
The method involves encoding service data, mapping it into OFDM symbols, frequency interleaving using a variable interleaving seed based on cyclic shifting and FFT size, and modulating the data for transmission, allowing for efficient transmission and reception of multiple services over the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast systems 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 data pipes, each carrying different types of data (video, audio, additional services). This segmentation allows efficient resource allocation and transmission optimization for each data type, resolving the contradiction between providing diverse services and maintaining transmission efficiency.
Solution Approach 2:
The patent introduces time-domain multiplexing as an additional dimension for data transmission. By transmitting different data pipes at different time slots within the same RF bandwidth, the system provides multiple services without sacrificing transmission efficiency, as each service gets dedicated time resources.
2Adaptability or versatility
If digital broadcast systems provide multiple services through same RF bandwidth, then network flexibility is improved, but transmission robustness deteriorates
Solution Approach 1:
The patent divides the broadcast signal into multiple data pipes with independent transmission paths. Each data pipe can be optimized for specific service requirements, allowing flexible service provision while maintaining robustness through independent error handling and retransmission strategies for each pipe.
Solution Approach 2:
The patent implements dynamic resource allocation where time slots and frequency resources are dynamically assigned to different data pipes based on service requirements. This dynamic approach enables network flexibility while maintaining transmission robustness through adaptive error correction and resource reassignment.
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, wherein the different interleaving-seed is generated based on a cyclic shifting value and wherein an interleaving seed is variable based on an FFT size of the modulating.