Antenna Decoupling Matrix for Multi-Antenna Wireless Systems
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Solution Overview
Problem
In multi-antenna wireless communication systems, antenna coupling occurs due to insufficient distance between physical antennas, leading to performance deterioration such as increased interference and power attenuation, which existing methods struggle to effectively control, especially in environments with geographically clustered Tx antennas.
Innovation Solution
A digital processor is used to process baseband signals and map them between virtual and physical antenna groups using a processing matrix determined by parameters like coupling values and signal responses, effectively minimizing coupling by converting signals between virtual antenna groups and physical antenna groups according to the equations X2=P·X1 for transmission and X1=P·X2 for reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If physical antennas are placed close together to increase antenna density, then the number of antennas per unit area increases, but antenna coupling occurs due to electromagnetic induction between adjacent antennas
Solution Approach 1:
The patent introduces a de-coupling matrix as an intermediary mathematical transformation that operates on the signal domain. This matrix acts as a mediator between the coupled physical antenna signals and the desired independent virtual antenna signals, effectively eliminating coupling effects without requiring physical separation of antennas
Solution Approach 2:
The patent transforms the antenna system by changing the parameter representation from physical antenna domain to virtual antenna domain through mathematical parameter transformation. By applying de-coupling matrix multiplication, the system parameters (signal correlations) are changed to achieve independence among virtual antennas while maintaining the physical antenna configuration
2Object-affected harmful factors
If sufficient distance is maintained between physical antennas to reduce coupling, then antenna coupling decreases, but the system becomes less efficient in terms of space utilization and antenna density
Solution Approach 1:
The patent transitions the problem from the spatial domain to the mathematical signal domain by introducing virtual antenna concepts. Instead of solving the coupling problem in the physical spatial dimension, the solution moves to another dimension (signal processing domain) where coupling can be eliminated through mathematical transformation, allowing high antenna density to be maintained in physical space
3Productivity
If multiple physical antennas are used to increase channel capacity, then system capacity increases, but interference between antennas increases due to coupling effects
Solution Approach 1:
The patent segments the coupled antenna system into independent virtual antenna channels through mathematical transformation. By applying the de-coupling matrix, the originally coupled signals from multiple physical antennas are separated into independent virtual antenna signals, allowing each to operate without interference while maintaining high channel capacity
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
This approach reduces correlation and interference between antennas, enhances power efficiency, and increases channel capacity by minimizing the influence of antenna coupling, particularly in environments with clustered Tx antennas.
Implementation Method 1
a phenomenon whereby current is induced in an antenna according to electromagnetic induction of current flowing in another antenna is referred to as antenna coupling
Data Source
AI summary
A communication apparatus in a multi-antenna wireless communication system is disclosed. In detail, the communication apparatus includes a first processor for processing a baseband signal defined as a first virtual antenna group, a second processor for mapping a signal defined as a second virtual antenna group and the baseband signal defined as the first virtual antenna group in order to remove coupling between antennas, and an antenna module for mapping the signal defined as the second virtual antenna group and a signal defined as a multiple physical antenna group.