Broadcast Signal Reception with OFDM Deinterleaving for Burst Errors
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Solution Overview
Problem
Digital broadcasting systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly for mobile reception devices, due to the large amount of data and varying bit rates involved in high-definition video and multi-channel audio services.
Innovation Solution
A method and system for receiving broadcast signals that includes synchronizing and OFDM demodulating the signal, parsing the signal frame, time deinterleaving, forward error correction decoding, and output formatting, with block deinterleaving using either linear or 2D memory, and determining the presence of virtual cells to handle variable bit rates and improve memory efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital broadcast signals transmit high definition video and multi-channel audio data, then image quality and audio quality are improved, but data transmission efficiency deteriorates
Solution Approach 1:
The broadcast data is divided into multiple data cells that are distributed across different OFDM symbols and frequency resources. This segmentation allows parallel transmission of high-definition video and audio data through multiple channels, improving overall transmission efficiency while maintaining high quality
Solution Approach 2:
The patent introduces time-interleaving in the time domain and frequency-interleaving in the frequency domain, transforming the data transmission from a single-dimensional sequence into a multi-dimensional structure. This allows efficient utilization of both time and frequency resources for high-definition content transmission
2Reliability
If time interleaving is applied to broadcast data, then robustness against burst errors is improved, but device complexity increases
Solution Approach 1:
The time-interleaved structure divides broadcast data into multiple cells distributed across different time slots. This segmentation spreads burst errors across multiple cells, and the corresponding deinterleaving at the receiver reconstructs the original sequence, providing robustness without requiring complex error correction codes
Solution Approach 2:
Time interleaving is applied in advance during transmission to pre-distribute data cells in a pattern that inherently protects against burst errors. This preliminary arrangement eliminates the need for complex real-time error detection and correction mechanisms at the receiver
3Device complexity
If block deinterleaving is performed using linear memory, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces complex two-dimensional memory structures with simpler linear memory, using software-generated address sequences to achieve the same deinterleaving effect. This substitution reduces hardware complexity while maintaining functional equivalence through precise address calculation
4Adaptability or versatility
If virtual FEC blocks are used to handle variable bit rates, then adaptability is improved, but loss of information increases
Solution Approach 1:
The patent extracts and removes virtual FEC blocks from the data stream after they have served their purpose of maintaining frame structure for variable bit rates. This extraction eliminates the placeholder data that would otherwise cause information loss, while the structural benefits are preserved
Data Source
AI summary
A method of receiving a broadcast signal is disclosed. A method of receiving a broadcast signal according to an embodiment of the present invention includes synchronizing and orthogonal frequency division multiplexing (OFDM) demodulating a received broadcast signal, parsing a signal frame of the received broadcast signal, time deinterleaving broadcast data of the signal frame, forward error correction (FEC) decoding the broadcast data, and output formatting the broadcast data and outputting a data stream.