Video Subframe Transmission Over Unstable Wireless Links
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Solution Overview
Problem
Existing video transmission methods suffer from signal-to-noise ratio (SNR) degradation and latency issues, particularly in wireless real-time applications with noise uncertainty or low SNR, leading to data corruption and increased latency, which is undesirable for teleoperation of mobile assets.
Innovation Solution
The method employs Uni Weight Image Sub Framing (UWISF) and Half Resolution Zero Padding to divide video frames into subframes, each transmitted on separate radio carriers, combined with real-time frame denoising and Advanced Shifting Video Modulation (ASVM) and Orthogonal Frequency Division Multiplexing-Relative Amplitude Shift Keying (OFDM-RASK) for robust and low-latency transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital modulation techniques (QAM) are used to achieve high channel capacity, then data transmission rate is improved, but signal-to-noise ratio degradation causes data corruption and increased latency
Solution Approach 1:
The video stream is divided into synchronization signals and pixel data, which are modulated using different schemes. Synchronization signals use analog modulation for robustness against SNR degradation, while pixel data uses digital modulation for high transmission capacity. This segmentation allows each component to be optimized for its specific requirements, resolving the contradiction between data rate and reliability.
Solution Approach 2:
Different modulation schemes are applied to different parts of the video data based on their specific needs. The synchronization portion receives analog modulation with higher robustness, while the pixel data portion receives digital modulation with higher capacity. This local differentiation of quality and approach resolves the contradiction by tailoring the modulation characteristics to the specific requirements of each data type.
2Reliability
If traditional analog modulation techniques are used to reduce sensitivity to SNR changes, then link robustness is improved, but synchronization signal loss interrupts the video stream
Solution Approach 1:
The video transmission is segmented into synchronization signals and pixel data, with each segment using appropriate modulation. Synchronization signals use analog modulation for robustness, while pixel data uses digital modulation with error correction capabilities. This segmentation prevents complete video stream interruption by ensuring that pixel data can be recovered even if synchronization experiences issues.
Solution Approach 2:
The system uses a composite modulation approach, combining analog and digital modulation techniques in a single transmission system. This hybrid approach leverages the strengths of both analog (robustness to SNR changes) and digital (error correction, data capacity) techniques, preventing video stream interruption by ensuring reliable transmission of both synchronization and pixel data.
3Quantity of substance
If video compression is used to reduce bandwidth requirements, then data amount is decreased, but latency is introduced into the system
Solution Approach 1:
The video data is segmented into synchronization signals and pixel data, transmitted using different modulation schemes. This segmentation allows for more efficient transmission by optimizing each segment's modulation approach, reducing the need for aggressive compression and thereby minimizing latency while still reducing data amount through efficient modulation utilization.
Data Source
AI summary
A method for wirelessly transmitting video related content. The method may include receiving a video frame; generating, based on the video frame, multiple video sub-frames. The generating may include virtually segmenting the video frame to diagonal portions and assigning different diagonal portions to different video sub-frames; associating a unique sub-carrier of a group of sub-carriers for each sub-frame of the multiple video frames; and wirelessly transmitting a representation of the multiple video sub-frames over the group of sub-carriers.