Skywave Large-Scale MIMO Antenna Array for Ionospheric Channel Adaptation
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Solution Overview
Problem
Current skywave communication systems, particularly those employing short-wavelength bands, face limitations in spectral and energy efficiencies, transmission bandwidth, distance, and terminal capacity, with only minor improvements achieved through point-to-point MIMO implementations.
Innovation Solution
A skywave large-scale MIMO communication method and system utilizing a short-wavelength band large-scale antenna array at the base station, employing time division duplex (TDD) communication mode, orthogonal frequency division multiplexing (OFDM) modulation, and adaptive frequency selection based on real-time ionospheric channel characteristics, along with dynamic scheduling of user groups for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point-to-point MIMO is employed in skywave communication, then system rate performance is improved slightly, but spectral efficiency and energy efficiency remain low
Solution Approach 1:
The patent segments the communication system into multiple independent antenna units (large-scale antenna array) at the base station, allowing parallel transmission to multiple users. This segmentation enables spatial multiplexing where different users can simultaneously occupy the same time-frequency resource, dramatically improving spectral efficiency compared to traditional point-to-point MIMO.
Solution Approach 2:
The patent transitions from traditional two-dimensional (time-frequency) resource allocation to three-dimensional spatial multiplexing by deploying large-scale antenna arrays. This adds the spatial dimension to resource allocation, enabling multiple users to communicate simultaneously on the same time-frequency resources through different spatial paths, thereby resolving the contradiction between system rate and spectral efficiency.
2Productivity
If large-scale MIMO is implemented in skywave communication, then spectral efficiency and transmission rate are improved, but system complexity increases
Solution Approach 1:
The patent applies partial action by implementing large-scale MIMO only at the base station with a large number of antenna units, while user terminals maintain simpler single-antenna or few-antenna configurations. This asymmetric implementation achieves the benefits of spatial multiplexing and improved spectral efficiency without requiring complex MIMO processing at mobile terminals, thus managing system complexity effectively.
3Quantity of substance
If short waveband skywave communication is used for global coverage, then infrastructure cost is reduced, but system rate and reliability are insufficient
Solution Approach 1:
The patent fundamentally changes the system parameters by introducing large-scale antenna arrays with many more antenna units than traditional systems. This parameter change transforms the channel capacity and multiplexing capability, enabling high-rate communication over the ionospheric channel while maintaining the cost-effective short waveband infrastructure.
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
Significantly enhances spectral and power efficiencies, transmission bandwidth, and terminal capacity by establishing a more accurate broadband channel model and adaptive resource management, leading to improved system performance and rate capabilities.
Implementation Method 1
skywave large-scale MIMO communication being carried out between the skywave communication base station and a user terminal within a coverage area by ionospheric reflection
Data Source
AI summary
The present disclosure relates to a skywave large-scale MIMO communication method, model, and system. A skywave communication base station in a short waveband is constructed using a large-scale antenna array, wherein skywave large-scale MIMO communication is carried out between the skywave communication base station and a user terminal in a coverage area by ionospheric reflection. The skywave communication base station determines a spacing of the large-scale antenna array according to a maximum operating frequency, and communicates with the user terminal based on a TDD communication mode, wherein a skywave large-scale MIMO signal is transmitted based on an OFDM modulation mode or a power efficiency improvement modulation mode. The skywave communication base station selects a communication carrier frequency within a short waveband range according to a real-time ionospheric channel characteristic, and adaptively selects an OFDM modulation parameter and a signal frame structure.