LTE Turbo Coding With Unequal Error Protection for Video Data
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Solution Overview
Problem
Existing video data protection methods in LTE systems do not effectively distinguish the importance of video data, leading to inadequate error protection, as they rely on convolutional codes and do not utilize unequal error protection techniques.
Innovation Solution
A data transmission method and apparatus that segments code blocks based on the quantity of symbol bits in the constellation diagram, performs turbo encoding, interleaving, and rate matching, and cascades output code blocks according to importance, ensuring that critical data is mapped to locations with lower bit error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If convolutional code is used for video data transmission in prior art, then data can be protected, but unequal error protection based on data importance cannot be achieved in LTE systems
Solution Approach 1:
The code block is segmented into multiple segments according to a segmentation quantity calculated based on the constellation diagram parameters. This segmentation enables different parts of the data to be mapped to different locations in the modulation symbol, allowing important data to be placed in more robust positions while less important data goes to less robust positions,从而实现 unequal error protection
Solution Approach 2:
Different segments of the code block are assigned different qualities of protection based on their importance. By calculating the segmentation quantity and mapping different segments to different positions in the modulation symbol (MSB vs LSB positions), the system provides locally differentiated error protection matching the local importance of different data portions
2Reliability
If video data is divided into different queues according to importance and sent to convolutional encoder, then unequal error protection is achieved, but this approach cannot be applied to LTE systems using turbo encoding
Solution Approach 1:
The invention changes the key parameter from pre-encoding queue division to post-encoding code block segmentation. By calculating the segmentation quantity based on constellation diagram parameters (Qm, Es/N0) and dividing the coded block accordingly, the system adapts unequal error protection to work with LTE turbo encoding while maintaining the core benefit of importance-based differential protection
3Device complexity
If all data bits are treated equally in LTE system, then system complexity is reduced, but data integrity and quality are compromised
Solution Approach 1:
The system performs preliminary segmentation of the code block before modulation mapping, calculating the segmentation quantity in advance based on constellation parameters. This preliminary action organizes the data segments in a specific order, enabling the mapping process to automatically place important data in more robust positions without requiring complex real-time decisions during transmission
Solution Approach 2:
The system applies unequal error protection selectively to different segments of the code block rather than to all data equally. By focusing the additional protection on specific segments containing important data (determined by the segmentation quantity calculation), the system achieves improved data integrity for critical information without uniformly increasing complexity across the entire transmission system
Data Source
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AI summary
Embodiments of the present invention relate to a data transmission method and apparatus based on unequal error protection and a device. The method includes: segmenting, according to a quantity of symbol bits in a constellation diagram, a code block corresponding to data, to obtain segmented code blocks; performing rate matching on the segmented code blocks obtained by channel encoding, to obtain output code blocks; cascading the output code blocks according to the quantity of symbol bits in the constellation diagram, to obtain cascaded code blocks; and sending the cascaded code blocks to a terminal device. According to the data transmission method and apparatus based on unequal error protection and the device in the embodiments of the present invention, unequal error protection for data is implemented in an LTE system.