Wireless Video Error Protection by Signal Importance
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Solution Overview
Problem
Wireless transmission of high-definition video is prone to errors due to varying link conditions, making it challenging to ensure the correct reception of important components of the video signal, such as lower spatial frequencies and most significant bits, especially under bandwidth limitations.
Innovation Solution
Implementing unequal error protection (UEP) by providing higher error protection to the more important elements of the video signal, using stronger error correction codes and modulation schemes for critical layers, while offering lesser protection to less important layers, allowing for error detection but not correction in the least important components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high level error recovery is applied to all video data, then video reception reliability is improved, but bandwidth consumption increases beyond available wireless link capacity
Solution Approach 1:
The patent applies different error protection levels to different portions of video data based on their importance. Critical components (lower spatial frequencies, most significant bits) receive stronger error correction codes, while less important components (higher spatial frequencies, least significant bits) receive weaker or no error protection. This local differentiation resolves the contradiction by ensuring reliable reception of essential video information without consuming excessive bandwidth across all data.
Solution Approach 2:
The video data is segmented into multiple layers or components with different importance levels (e.g., base layer and enhancement layers in scalable video coding). Each segment is then protected with appropriate error recovery strength. This segmentation allows the system to prioritize bandwidth allocation to critical segments while reducing or eliminating protection for non-critical segments, thereby resolving the bandwidth-reliability tradeoff.
2Reliability
If stronger error correction codes are used for all data, then error protection is improved, but transmission efficiency decreases due to increased redundancy
Solution Approach 1:
Different error correction codes with varying strengths are applied locally to different video components. Critical components use stronger codes with higher redundancy for maximum error protection, while non-critical components use weaker codes or no correction to maintain transmission efficiency. This local quality approach resolves the contradiction by optimizing the tradeoff between error protection and transmission efficiency for each data portion.
Solution Approach 2:
Instead of applying full error correction to all data, the patent applies partial error correction only where necessary. The most important video components receive excessive error protection beyond what would be needed for average data, while less important components receive minimal or no correction. This partial action strategy maintains high transmission efficiency while providing sufficient error protection for critical information.
Data Source
AI summary
Wireless transmission of high-definition video, whether essentially uncompressed or compressed, is prone to errors during reception due to the condition of the wireless link. To ensure video quality during changing link conditions it is desirable to ensure that those portions of the video that represent the more important components of the video signal, such as the lower special frequencies or most significant bits, are assured correct reception at the receiver. Bandwidth limitations of the wireless link affect the amount of data that can be sent over the link. Hence, using a high level error recovery for all of the information is not feasible. Accordingly, a method and apparatus for unequal error protection is disclosed that provides a higher level of error protection to the more important elements of the transmission while affording less error protection to the other elements of the transmission.