Adaptive Full-Duplex Array for Self-Interference Cancellation
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Solution Overview
Problem
Existing full-duplex data transmission systems face challenges with signal interference and power loss, particularly in long-distance communication, leading to inefficiencies and the need for high power transmission.
Innovation Solution
A full duplex adaptive array system with a network array comprising multiple ports and elements, utilizing weights to modify transmission signals to cancel self-interference and enhance signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is used to improve bandwidth utilization and data transmission rate, then the data transmission efficiency is improved, but self-interference occurs between transmit and receive signals
Solution Approach 1:
The patent applies self-interference cancellation techniques that convert the harmful self-interference signal into a beneficial component by using the transmitted signal itself to generate and subtract an estimate of the interference from the received signal, thereby enabling full-duplex operation
Solution Approach 2:
The system performs preliminary anti-action by pre-calculating and subtracting the expected self-interference component from the received signal before processing, using knowledge of the transmitted signal to cancel out the interference in advance
2Length of stationary object
If high power is used to transmit signals over long distances to improve signal strength, then the transmission distance is extended, but the interference between transmitted and received signals increases
Solution Approach 1:
The patent converts the harmful high-power interference into a useful signal by using the strong transmitted signal to accurately estimate and cancel the self-interference component, allowing long-distance transmission without proportionally increasing interference
3Device complexity
If traditional four-port full-duplex systems are used to reduce channel requirements, then the number of channels is reduced, but self-interference cancellation becomes more difficult
Solution Approach 1:
The patent segments the transmission and reception functions into separate processing stages, with dedicated self-interference cancellation processing that divides the interference cancellation into estimation and subtraction components, making the four-port system manageable despite the interference challenge
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 effectively reduces self-interference, allowing for successful long-distance communication with reduced power requirements and improved signal-to-noise ratios.
Implementation Method 1
power decreases by 1/r{circumflex over ( )}2 such that doubling a transmission distance decreases the signal by 1⁄4
Implementation Method 2
A weight is applied to at least one of the at least two transmission elements of the first port, wherein the weight modifies the at least one signal transmitted along the second network path to the receiving element of the third port to cancel signal interference
Data Source
AI summary
A system and method for self-interference cancellation using a full duplex adaptive array includes at least four ports within the network array, with at least two transmission elements at a first port and a second port, and at least one receiving element at a third port and a fourth port. A signal is transmitted along a first network path from the two transmission elements of the first port to the receiving element of the fourth port. The signal is transmitted along a second network path from the two transmission elements of the first port to the receiving element of the third port. A weight is applied to at least one of the two transmission elements of the first port, which modifies the signal transmitted along the second network path to cancel signal interference caused by the signal at the third port during full duplex operation of the network array.