Antenna System Symmetric Pairs Self-Interference Cancellation
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Solution Overview
Problem
Existing antenna systems face significant self-interference issues due to the strong attenuation of radio signals, which limits their frequency spectrum efficiency and affects the reception of desired signals.
Innovation Solution
The proposed antenna system employs symmetrically distributed transmit and receive antenna pairs, along with in-phase or out-of-phase dividing and combining devices, to cancel out self-interference signals by ensuring that signals received by receive antennas are either in-phase or out-of-phase and of equal amplitude, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex technology is used to improve frequency spectrum efficiency, then frequency spectrum efficiency is improved, but self-interference from transmit signals to receive signals increases
Solution Approach 1:
The transmit antenna is divided into two separate transmit antennas, and the receive antenna is divided into two separate receive antennas. This segmentation allows the system to process and cancel self-interference signals more effectively by treating them as separate entities that can be individually managed and combined to eliminate interference.
Solution Approach 2:
The patent employs asymmetric distribution of antenna elements where the two transmit antennas and two receive antennas are positioned at different locations and orientations. This asymmetric arrangement creates distinct signal paths that enable the system to differentiate between desired signals and self-interference, facilitating effective interference cancellation while maintaining full-duplex operation.
2Productivity
If transmit and receive operations are performed simultaneously on the same radio channel, then frequency spectrum efficiency is improved, but the receive signal is blocked or interfered by the transmit signal
Solution Approach 1:
The system performs preliminary anti-action by proactively canceling self-interference signals before they can block or interfere with the desired receive signals. The antenna system is designed to predict and counteract the self-interference that would naturally occur during simultaneous transmit and receive operations, thereby preventing signal blocking and maintaining reliable reception.
Solution Approach 2:
The patent converts the harmful self-interference signal into a beneficial component by using it as a reference to generate the cancellation signal. The same transmit signal that causes interference is also used to create an opposing signal that eliminates the interference, transforming the harmful effect into a useful mechanism for interference reduction.
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 configuration effectively cancels out self-interference signals, enhancing the antenna system's ability to receive signals without interference from transmit signals, thereby improving frequency spectrum efficiency and reducing strong interference.
Implementation Method 1
each dividing device is configured to: divide one transmit signal into two transmit signals and separately send the two transmit signals to two transmit antennas of a corresponding transmit antenna pair... the dividing device is an in-phase dividing device, and the combining device is an out-of-phase combining device; or the dividing device is an out-of-phase dividing device, and the combining device is an in-phase combining device
Implementation Method 2
each combining device is configured to combine two receive signals received by two receive antennas of a corresponding receive antenna pair into one receive signal... the combining device is an out-of-phase combining device; or the dividing device is an out-of-phase dividing device, and the combining device is an in-phase combining device
Implementation Method 3
two transmit antennas of each transmit antenna pair in the M transmit antenna pairs are symmetrically distributed on both sides of a same symmetry axis... two receive antennas of each receive antenna pair in the N receive antenna pairs are symmetrically distributed on both sides of the symmetry axis
Implementation Method 4
A premise for implementing wireless full duplex is that strong interference (referred to as Self-interference) to a receive signal from a transmit signal of a same transceiver is avoided, reduced, and eliminated as much as possible, so that properly receiving a wanted signal is not affected by the strong interference
Data Source
AI summary
An antenna system, including: M transmit antenna pairs, where two transmit antennas of each transmit antenna pair are symmetrically distributed on both sides of a same symmetry axis; N receive antenna pairs, where two receive antennas of each receive antenna pair are symmetrically distributed on both sides of the symmetry axis; M dividing devices, which are one-to-one corresponding to the M transmit antenna pairs, and each dividing device is configured to: divide one transmit signal into two transmit signals and separately send the two transmit signals to a corresponding transmit antenna pair; and N combining devices, which are one-to-one corresponding to the N receive antenna pairs. Each combining device is configured to combine two receive signals received by a corresponding receive antenna pair into one receive signal. One of the dividing device and the combining device is an in-phase dividing device, and the other is an out-of-phase combining device.