Full-Duplex Transceiver Adapter Self-Interference Cancellation
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Solution Overview
Problem
Current wireless communication systems are limited to one-way or half-duplex operations, unable to transmit and receive simultaneously over the entire frequency band due to excessive interference, hindering the implementation of full-duplex capabilities which could enhance communication rates, security, and throughput.
Innovation Solution
A full-duplex transceiver adapter that generates and uses radio-frequency corrective signals to cancel self-interference, allowing simultaneous transmission and reception at the same frequency by shifting and processing inbound and outbound signals to separate frequencies, enabling efficient use of the radio-frequency spectrum while interfacing with conventional half-duplex transceivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex wireless communication is implemented to transmit and receive simultaneously over the entire frequency band, then communication rate and throughput are doubled, but excessive self-interference from transmitter to receiver occurs
Solution Approach 1:
The patent converts the harmful self-interference signal into a useful component by capturing the transmitted signal through a coupler, processing it through adaptive filters to generate corrective signals, and combining these with the received signal to cancel the interference. This transforms the harmful self-interference into an opportunity for improved full-duplex communication performance.
Solution Approach 2:
The patent introduces intermediary components including a signal coupler to sample the transmitted signal, adaptive filters as intermediate processing stages, and a signal combiner to merge the corrective signals with the received signal. These intermediaries enable the separation and cancellation of self-interference from the desired received signal.
2Reliability
If separate time slots or frequency bands are used for transmit and receive operations, then self-interference is avoided, but the ability to transmit and receive concurrently over the entire frequency band is lost
Solution Approach 1:
The patent changes the parameters of the self-interference signal by processing it through adaptive filters that adjust amplitude and phase characteristics. This transformation enables the generated corrective signal to match and cancel the self-interference component in the received signal, allowing full-duplex operation without interference degradation.
3Device complexity
If conventional half-duplex transceivers are used, then device complexity is reduced, but simultaneous transmit and receive capability is not achieved
Solution Approach 1:
The adapter serves as an intermediary device that interfaces between conventional half-duplex transceivers and full-duplex communication requirements. It captures transmitted signals, generates corrective signals through adaptive processing, and combines these with received signals, enabling full-duplex capability without requiring complete redesign of the transceiver architecture.
Solution Approach 2:
The patent segments the full-duplex communication function into separate components: the existing transceiver handles basic transmit and receive operations, while the added adapter module handles self-interference cancellation. This segmentation allows incremental implementation and maintains compatibility with conventional transceivers.
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 effectively reduces self-interference, enabling full-duplex wireless communication, doubling point-to-point throughput, enhancing security, and facilitating multi-node distributed signaling and ultra-low power transmission.
Implementation Method 1
the adapter shifts the frequency of the outbound radio-frequency signal to a second radio frequency different from the first radio frequency
Implementation Method 2
generates and uses radio-frequency corrective signals to cancel self-interference
Data Source
AI summary
An apparatus is described, along with methods, the apparatus including a half-duplex transceiver including one or more half-duplex antenna terminals, a full-duplex transceiver including one or more full-duplex antennas, and an interface coupled between the half-duplex transceiver and the full duplex transceiver, the interface enabling the one or more half-duplex antenna terminals and the one or more full-duplex antennas to send and receive radio-frequency (RF) signals over a same frequency band simultaneously.