Sliding Window Error-Correcting Code for Low-Latency Decoding
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Solution Overview
Problem
Existing error-correcting codes for real-time audio and video streams, such as those used in video conferencing, often suffer from significant decoding delays due to their fixed or variable rates, which can be detrimental in environments where immediate data processing is required.
Innovation Solution
The implementation of a sliding window-based error-correcting code system that dynamically adjusts its encoding and decoding processes using a pseudorandom number generator and Galois field operations, allowing for efficient transmission and decoding of packets with reduced latency by maintaining a constant overhead independent of the encoder window size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If typical variable rate codes are used, then the code rate can adapt to varying channel conditions, but the decoding delay becomes long
Solution Approach 1:
The patent divides the message into smaller blocks and processes them independently through a sliding window mechanism. Each window contains a limited number of source symbols that are encoded and decoded separately, allowing the decoder to output symbols as soon as sufficient received symbols are available, thereby reducing decoding delay while maintaining variable rate capability.
Solution Approach 2:
The patent implements a dynamic sliding window that moves forward as transmission progresses. The window size and position are adjusted based on channel conditions and decoding progress, enabling the system to adapt the code rate dynamically while ensuring that each window can be decoded with limited dependency on future symbols, thus reducing overall decoding delay.
2Loss of time
If a sliding window is used to reduce decoding delay, then real-time communication is improved, but the decoder complexity increases
Solution Approach 1:
By segmenting the decoding process into independent or minimally dependent windows, the patent reduces the computational burden on the decoder. Each window can be processed with limited back-reference to previous windows, simplifying the decoder architecture compared to processing the entire message sequence simultaneously.
Solution Approach 2:
The patent performs preliminary encoding within each sliding window before transmission, organizing the codewords in a structure that facilitates efficient decoding. The encoder prepares the coded symbols in advance with known window boundaries, allowing the decoder to process each window independently or with minimal lookahead, reducing overall decoder complexity.
Data Source
AI summary
A method is provided to transmit an error-correcting code. The method includes receiving a source packet, advancing a sliding encoder window after receiving the source packet, and generating coded packets by, when the padded packet is encoded for a first time, encoding the source packet alone, and, when the source packet is encoded for a number of times after the first time, encoding the source packet with older source packets in the sliding window.