HF Link Multiplexing via Segmented Interleaving
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Solution Overview
Problem
Current HF communication systems struggle to multiplex different services with varying latency, jitter, and error rate requirements, leading to inefficient throughput and inability to handle multiple communications simultaneously without interrupting existing services.
Innovation Solution
A method and system that segment data streams into blocks and frames, adapt coding and interleaving parameters based on quality of service requirements, and mix sub-frames from unconstrained and constrained data streams for transmission, allowing simultaneous multiplexing of diverse services on the same HF link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-sized interleaver and slow alternation are used to achieve good error rate performance, then reliability is improved, but latency and responsiveness deteriorate
Solution Approach 1:
The patent segments the single data stream into multiple independent channels (e.g., 4 channels), each with its own interleaver of reduced size. This segmentation allows each channel to have lower latency while the combination provides overall reliability, resolving the contradiction between large interleaver size and responsiveness.
Solution Approach 2:
The patent combines multiple channels with smaller interleavers into a single transmitted signal. The receiver processes these channels and combines them to achieve the reliability of a large interleaver while maintaining the low latency of smaller individual interleavers.
2Loss of time
If a small-sized interleaver and fast alternation are used to achieve responsiveness for real-time applications, then latency is reduced, but error rate performance deteriorates
Solution Approach 1:
The patent divides the data stream into multiple channels, each processed by a small interleaver that provides fast responsiveness. The combination of these channels reconstructs the overall data with improved error rate performance, resolving the contradiction between small interleaver size and reliability.
3Reliability
If services are processed sequentially to adapt communication conditions to each service, then quality of service for individual services is improved, but productivity and multiplexing capability deteriorate
Solution Approach 1:
The patent merges multiple services into a single multiplexed data stream that is transmitted over one communication channel. The receiver separates and processes these services, allowing simultaneous transmission of multiple services with different quality requirements without sequential processing delays.
Solution Approach 2:
The patent creates a universal communication system that can handle multiple service types (voice, data, video) simultaneously over a single HF channel. The system adapts to different service requirements through the multi-channel structure while maintaining the ability to process all services in parallel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient multiplexing of services with different quality of service requirements without degrading overall throughput, allowing for simultaneous voice and data transmission without interruption, and improving error rate performance by adapting interleaving and coding to specific service constraints.
Implementation Method 1
The long-distance communication capability of HF links relies on the reflection of HF waves varying in the range [2.30 MHz], off the ionospheric layers.
Data Source
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AI summary
The invention relates to a method and system for transmitting data within a communication system operating at a high frequency and including a link layer and a physical layer, said system including a transmitter and a receiver, said transmitter comprising at least one scheduler, wherein the method is characterized in that it comprises: a step of segmenting at least two data streams (F1, F2), each of the streams having a service constraint and being segmented into a plurality of data sub-blocks (FjBi); a step in which the data sub-blocks are converted into frames; and then a step of encoding and interleaving the first frame (TF1) and second frame (TF2), thereby producing sub-frames (STF1c, STF2c), and then generating a frame to be transmitted by mixing n sub-frames (STF1c) of data stream F1 with m sub-frames (STF2c) of data stream F2.