Digital Broadcasting TRS Code Null Packet Synchronization
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Solution Overview
Problem
The U.S-oriented terrestrial waves digital broadcasting system, specifically the ATSC VSB method, experiences poor reception performance in poor channel conditions, particularly in Doppler fading channels, due to low frequency of known reference signals and limited capacity for multipath removal.
Innovation Solution
A digital broadcasting transmission system that inserts null packets with predefined known data at certain intervals in the MPEG-2 packet and uses a transversal Reed Solomon (TRS) code to enhance error correction, improving reception performance by increasing the frequency and reliability of known data for synchronization and equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If null packets with known data are inserted at certain intervals in MPEG-2 packets, then the frequency and reliability of known data for synchronization and equalization is improved, but the device complexity increases
Solution Approach 1:
The patent segments the data transmission by inserting null packets at specific intervals between actual data packets. This segmentation creates distinct known data regions (null packets with predefined patterns) that can be independently processed for synchronization and equalization, improving reception performance without requiring complete system redesign
Solution Approach 2:
The null packets with predefined known data are inserted in advance during transmission. These preliminary known data segments enable the receiver to perform synchronization and channel equalization before processing the actual data packets, improving overall reception performance without adding complex real-time processing requirements
2Reliability
If TRS code is added to enhance error correction capacity, then error correction performance is improved, but the device complexity and processing overhead increases
Solution Approach 1:
The patent merges the TRS (Transversal Reed-Solomon) error correction code with the existing MPEG-2 packet structure. The TRS code is integrated into the null packets and data packets in a unified manner, allowing error correction to be performed using the same processing framework without adding separate complex error correction systems
Solution Approach 2:
The TRS code changes the error correction parameters by adding transversal redundancy dimensions to the existing Reed-Solomon coding. This parameter enhancement provides stronger error correction capability (up to 8-bit error correction per packet) while maintaining compatibility with existing reception systems through standardized processing algorithms
3Reliability
If known data frequency is increased through null packet insertion, then synchronization and equalization performance is improved, but the data transmission efficiency decreases
Solution Approach 1:
The null packets with known data are inserted at periodic intervals rather than continuously. This periodic insertion pattern provides sufficient known data for synchronization and equalization while minimizing the impact on data transmission efficiency. The receiver can effectively track channel characteristics using these periodic references without significant loss of throughput
Data Source
AI summary
A digital broadcasting transmission and/or reception system having an improved reception performance and a signal-processing method thereof. A digital broadcasting transmitter comprises a TRS encoder for to TRS-encode a MPEG-2 transmission stream having null data for inserting a Known data and a TRS parity at predetermined positions, randomizer to input and randomize data stream from the TRS encoder, a null packet exchanger to replace the null data for inserting the Known data to the known data, and an encoder for encoding a data streams to which the Known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization and further uses the TRS parity for correcting error of the received signal, so that the digital broadcasting reception performance can be improved at poor multipath channels.