Antenna Array Isolation for Full-Duplex MIMO
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Solution Overview
Problem
Massive MIMO systems face challenges in achieving effective electromagnetic isolation between transmit and receive antenna elements during full-duplex communication, leading to increased self-interference and complexity in signal processing operations.
Innovation Solution
Incorporating a gain-controlled antenna structure with an electromagnetic isolation structure, such as an electromagnetic band gap (EBG) isolator, to separate transmit and receive antenna elements, and using beamforming processors to adjust the gains of amplifiers for both transmit and receive signals, enabling simultaneous transmission and reception on the same wireless resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented in massive MIMO systems, then spectral efficiency is improved, but self-interference increases
Solution Approach 1:
The antenna array is segmented into separate transmit antenna elements and receive antenna elements, with transmit elements dedicated to transmission and receive elements dedicated to reception. This physical segmentation allows simultaneous transmission and reception on the same frequency resource while managing self-interference through spatial separation.
Solution Approach 2:
An electromagnetic isolation structure is introduced as an intermediary component between the transmit antenna elements and receive antenna elements. This isolation structure acts as a mediator that blocks or reduces electromagnetic coupling from transmit to receive elements, thereby reducing self-interference while enabling full-duplex operation.
2Object-generated harmful factors
If electromagnetic isolation structure is added, then self-interference is reduced, but device complexity increases
Solution Approach 1:
An electromagnetic isolation structure is introduced as an intermediary component between the transmit antenna elements and receive antenna elements. This isolation structure acts as a mediator that blocks or reduces electromagnetic coupling from transmit to receive elements, thereby reducing self-interference while enabling full-duplex operation.
Solution Approach 2:
The system changes the electromagnetic parameters (such as impedance, electromagnetic bandgap frequencies) of the isolation structure to optimize its performance in blocking self-interference while maintaining a practical and manageable structural complexity.
3Productivity
If multiple antenna elements are used, then capacity and energy-efficiency are improved, but signal processing complexity increases
Solution Approach 1:
The antenna array is segmented into separate transmit antenna elements and receive antenna elements, with transmit elements dedicated to transmission and receive elements dedicated to reception. This physical segmentation allows simultaneous transmission and reception on the same frequency resource while managing self-interference through spatial separation.
Solution Approach 2:
The system changes the electromagnetic parameters (such as impedance, electromagnetic bandgap frequencies) of the isolation structure to optimize its performance in blocking self-interference while maintaining a practical and manageable structural complexity.
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 solution reduces self-interference and simplifies signal processing operations by providing effective electromagnetic isolation, enhancing the spectral efficiency and energy efficiency of massive MIMO systems.
Implementation Method 1
an electromagnetic isolation structure between the plurality of transmit antenna elements and the plurality of receive antenna elements
Implementation Method 2
the isolation structure is an electromagnetic band gap (EBG) isolator
Data Source
AI summary
An antenna having an array structure for full-duplex communication on a same wireless resource is provided, as well a network element including such an antenna and a beamforming processor. A method for transmitting and receiving simultaneously on a same wireless resource using such an antenna is also provided. The antenna includes multiple transmit antenna elements, each of these elements coupled to a respective gain-controlled transmit amplifier. The antenna also includes multiple receive antenna elements, each of these elements coupled to a respective gain-controlled receive amplifier. The antenna also includes an electromagnetic isolation structure located between the plurality of transmit antenna elements and the plurality of receive antenna elements.