Full-Duplex Transceiver Self-Interference Cancellation
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Solution Overview
Problem
Current wireless systems are limited to one-way communication, unable to transmit and receive simultaneously over the entire frequency band due to excessive interference, hindering the implementation of full-duplex wireless communication.
Innovation Solution
A full-duplex transceiver system that generates corrective signals to cancel self-interference by processing incoming and outgoing radio-frequency signals, using analog and digital signal processing techniques to isolate and amplify desired signals while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex wireless communication is implemented to enable simultaneous transmission and reception over the entire frequency band, then communication efficiency and throughput are improved, but self-interference from the transmitter to its own receiver becomes excessive
Solution Approach 1:
The patent measures the self-interference channel using test signals and converts the harmful self-interference into a measurable and cancelable quantity. By characterizing the interference channel and generating corrective signals, the system transforms the harmful effect into a controllable parameter that can be compensated for, enabling full-duplex operation.
Solution Approach 2:
The patent applies preliminary anti-action by measuring the self-interference channel before actual communication and pre-generating corrective signals to cancel the anticipated interference. The system characterizes the interference path in advance and prepares compensation signals that are applied during transmission, preventing the harmful effect from degrading communication performance.
2Object-generated harmful factors
If separate time slots or frequency bands are used for transmission and reception as in conventional systems, then self-interference is reduced, but the ability to transmit and receive concurrently over the entire frequency band is lost
Solution Approach 1:
The patent changes the parameter of frequency utilization from traditional TDD/FDD approaches to continuous full-duplex operation. By measuring and compensating for self-interference, the system enables both transmit and receive operations to occur simultaneously across the entire frequency band, maximizing spectral efficiency and throughput.
Solution Approach 2:
The patent makes the wireless system universally capable of full-duplex operation by implementing a general framework that measures self-interference channels and applies corrective signals across all frequency bands. This multi-functional approach allows the system to simultaneously perform transmission, reception, and interference cancellation operations.
3Productivity
If full-duplex capability is implemented in multi-user wireless systems, then the potential benefits exceed mere doubling of communication rate, but the complexity of managing interference in broadcast nature transmission increases
Solution Approach 1:
The patent implements feedback by measuring the self-interference channel using test signals transmitted through the same path and received by the same receiver. This feedback mechanism characterizes the interference properties and enables the generation of corrective signals that are injected back into the receive path, creating a closed-loop interference cancellation system.
Solution Approach 2:
The patent uses test signals as intermediaries to measure and characterize the self-interference channel. These test signals serve as mediators that allow the system to probe the interference path without affecting normal communication, enabling accurate channel estimation and subsequent interference cancellation.
Data Source
AI summary
A full-duplex transceiver is provided with componentry and methods for cancellation of nonlinear self-interference signals. The transceiver is capable of receiving an incoming radio-frequency signal that includes both a desired radio-frequency signal component and a self-interference component caused by the transceiver's own radio-frequency transmission. The transceiver demodulates the incoming radio-frequency signal to generate a first demodulated signal. The transceiver combines an analog corrective signal with the first demodulated signal to generate a second demodulated signal with reduced self-interference. The transceiver processes the first and second demodulated signals to determine a desired incoming baseband signal and to determine nonlinear components of the self-interference signal, such as nonlinearities introduced by the transceiver's power amplifier.