Skywave Signal Decoding for Low Latency Wireless Paths
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Solution Overview
Problem
Multipath propagation in wireless communication leads to signal interference, latency, and distortion due to radio signals taking multiple paths between a transmitter and a receiver, particularly when using skywave propagation.
Innovation Solution
A communication system utilizing skywave propagation for low latency and low bandwidth data transmission, combined with a high bandwidth but high latency transoceanic fiber optic cable for data requiring higher bandwidth. The system filters and decodes signals based on the number of hops, using a hybrid approach to combine signals from different paths to minimize latency and error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If skywave propagation with multiple hops is used for long-distance communication, then bandwidth efficiency is improved, but latency increases and signal distortion occurs
Solution Approach 1:
The patent segments the communication system into two parallel pathways: a skywave propagation path for low-latency critical data and a fiber optic path for high-bandwidth non-critical data. This segmentation allows each path to be optimized for its specific function, resolving the contradiction between bandwidth efficiency and latency by assigning different data types to different transmission media.
Solution Approach 2:
The system dynamically selects and combines signals from different hop paths based on real-time signal quality metrics such as signal-to-noise ratio and error rates. The receiver can adaptively choose to use two-hop, three-hop, or hybrid paths depending on current ionospheric conditions, optimizing the balance between bandwidth efficiency and latency dynamically rather than statically.
2Length of stationary object
If signals take paths with more hops to reach the receiver, then coverage distance is improved, but signal distortion and error rate increase
Solution Approach 1:
The patent merges signals from multiple propagation paths (two-hop skywave, three-hop skywave, and fiber optic) into a hybrid communication system. By combining these diverse paths, the system achieves both extended coverage distance and improved signal reliability, as the failure or degradation of one path can be compensated by others.
Solution Approach 2:
The system implements feedback mechanisms where the receiver monitors signal quality metrics (SNR, error rates) from different hop paths and feeds this information back to the transmitter and decoder. This enables adaptive modulation, coding, and path selection to maintain optimal signal quality across varying ionospheric conditions and coverage distances.
3Reliability
If the receiver attempts to decode multiple signals from different paths, then reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary filtering and preprocessing to incoming signals before full decoding attempts. The receiver first evaluates signal quality metrics (arrival time, SNR, power level) to pre-select which paths are worth decoding, eliminating low-quality signals early in the process. This preliminary action reduces the number of full decoding operations needed while maintaining high reliability.
Solution Approach 2:
Different decoding strategies and complexity levels are applied to different signal paths based on their local characteristics. For example, high-SNR two-hop signals may use simpler decoding, while lower-SNR three-hop or fiber optic signals receive more robust error correction processing. This localized quality approach optimizes processing complexity according to the specific needs of each signal path.
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
The system achieves low latency and high reliability in data transmission across long distances by prioritizing signals with fewer hops and combining signals from multiple paths, thereby reducing interference and distortion.
Implementation Method 1
Refraction and reflection from the ionosphere and from water and land on the surface of the Earth may cause multiple instances of the same signal to be received
Implementation Method 2
Refraction and reflection from the ionosphere and from water and land on the surface of the Earth may cause multiple instances of the same signal to be received
Data Source
AI summary
A wireless communication system includes a first wireless communication node for transmitting a data signal that is sent to a second wireless communication node by skywave propagation over at least two different data transmission paths. The first data transmission path includes at least one reflection point where the data signal is reflected by the atmosphere and the second data transmission path includes more reflection points than the first data transmission path. The data signal that travelled along the first data transmission path is decoded before the data signal that travelled along the second data transmission path.