OFDM Broadcast Signal Processing with Adaptive Time Deinterleaving
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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 implementation of a method and apparatus for transmitting and receiving broadcast signals using Orthogonal Frequency Division Multiplexing (OFDM) with time deinterleaving and decoding, allowing for the multiplexing of multiple services within the same RF signal bandwidth and enabling flexible data transmission and robust error control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
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 data into multiple transport streams, each carrying different types of content (video, audio, additional services). This allows parallel transmission of multiple data flows through separate logical channels, improving overall transmission efficiency while handling large data volumes.
Solution Approach 2:
The patent introduces time-division multiplexing as an additional dimension for data transmission. By allocating different time slots to different transport streams, the system can transmit multiple types of data simultaneously over the same physical channel, thereby improving data transmission efficiency.
2Adaptability or versatility
If multiple broadcast services are transmitted through the same RF signal bandwidth, then spectrum utilization is improved, but signal robustness deteriorates
Solution Approach 1:
The patent divides the transmitted signal into multiple orthogonal frequency sub-carriers, each carrying a portion of the data. This frequency-domain segmentation allows multiple services to share the same RF bandwidth while maintaining signal robustness through diversity in the frequency domain.
Solution Approach 2:
The patent employs periodic time-deinterleaving that distributes data symbols across multiple time slots and frequency sub-carriers in a periodic pattern. This periodic distribution provides time and frequency diversity, enhancing signal robustness against fading and interference while enabling efficient spectrum utilization.
3Reliability
If time deinterleving is performed depending on number of physical paths, then error control is improved, but processing complexity deteriorates
Solution Approach 1:
The patent implements dynamic time-deinterleaving where the deinterleaving pattern adapts based on the number of detected physical paths. The system adjusts the interleaving depth and pattern according to channel conditions, optimizing error control performance while managing processing complexity through adaptive rather than fixed complex processing.
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse a signal frame from the demodulated broadcast signals, wherein the signal frame includes at least one service data, a time deinterleaver to time deinterleave each the service data, wherein the time deinterleaving is performed depending on a number of physical paths for each the service data, a damapper to demap the time deinterleaved data and a decoder to decode the demapped service data.