DTV Enhanced Data Frame Interleaving for Noise-Robust Broadcasting
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Solution Overview
Problem
Digital television systems face challenges in transmitting supplemental data due to signal degradation from noise and ghost effects, especially in indoor environments with obstacles, which can lead to errors in critical data transmission, requiring a system resistant to noise and compatible with existing digital broadcasting systems.
Innovation Solution
A digital broadcasting system employing a pre-processor with RS frame encoders and interleaving processes to enhance data robustness, using RS encoding for error correction and cyclic redundancy check encoding for error detection, and multiplexing interleaved frames to improve transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If supplemental data is transmitted through the same channel as video/audio data using time-division method, then data broadcasting capability is provided, but receiving performance deteriorates in poor channel environments due to ghost effects and noise
Solution Approach 1:
The data transmission is segmented into multiple frames that are interleaved and distributed across different time slots. This segmentation allows the system to separate enhanced data from main data streams, applying different error correction strategies to each segment based on their specific reliability requirements.
Solution Approach 2:
Error correction codes are applied in advance to the enhanced data frames before transmission. The system performs preliminary error correction encoding and interleaving on the data frames to prevent corruption from ghost effects and noise, rather than attempting to correct errors after reception.
2Reliability
If error correction encoding is applied to enhanced data frames, then error resistance is improved, but system complexity increases
Solution Approach 1:
The system merges the error correction functionality into the existing frame structure by combining enhanced data frames with main data frames in a unified interleaved sequence. This integration allows error correction to be applied without requiring separate dedicated transmission channels or independent processing systems.
Solution Approach 2:
The system applies error correction encoding selectively to enhanced data frames rather than all data streams. This partial action approach focuses computational resources on the most critical data requiring error protection, reducing overall system complexity while maintaining necessary reliability.
3Reliability
If interleaving is applied to super frames, then resistance to ghost effects and noise is enhanced, but processing time increases
Solution Approach 1:
The interleaving process is applied periodically to super frames in a systematic pattern rather than continuously to individual frames. This periodic application reduces processing overhead while maintaining the statistical distribution benefits that provide resistance to ghost effects and impulsive noise.
Solution Approach 2:
Interleaving is performed in advance on super frames before transmission, spreading data elements across time slots proactively. This preliminary interleaving prevents concentrated errors from affecting multiple data elements simultaneously, reducing the need for complex real-time error handling at the receiver.
Data Source
AI summary
A digital television (DTV) transmitting system includes a first frame decoder, a second frame decoder, and a frame multiplexer. The first frame decoder forms first enhanced data frames, encodes each data frame for error correction, forms a first super frame by combining the encoded first frames, and interleaves the first super frame. The second frame decoder forms second enhanced data frames, encodes each data frame for error correction, forms a second super frame by combining the encoded second frames, and interleaves the second super frame. The frame multiplexer multiplexes the interleaved first and second enhanced data frames.