Full-Duplex Transceiver Self-Interference Cancellation
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Solution Overview
Problem
Existing full-duplex wireless transceivers have an inadequate self-interference cancellation effect due to limited adjustable parameters in analog devices used for radio frequency signal processing.
Innovation Solution
A full-duplex wireless transceiver system that includes a sending module, a receiving module, a cancellation signal generation module, and a channel estimation module, where the cancellation signal generation module performs phase, amplitude, and delay adjustments on radio frequency signals based on channel characteristics to generate a cancellation signal for self-interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-interference cancellation is performed using analog devices (delayer, attenuator, phase shifter), then the transceiver can cancel interference in the radio frequency domain, but the adjustable digits are limited resulting in inadequate cancellation effect
Solution Approach 1:
The patent replaces the traditional mechanical/analog adjustment system (delayer, attenuator, phase shifter) with a digital signal processing system. The digital system uses a delay element, complex coefficient multiplier, and signal combiner to generate cancellation signals with fully programmable delay and amplitude control, overcoming the limited adjustable digits of analog devices.
Solution Approach 2:
The patent changes the control parameters from fixed analog settings to dynamically adjustable digital parameters. The channel estimation module continuously estimates the self-interference channel characteristics and generates control signals that adjust the delay and complex coefficients of the cancellation signal, enabling adaptive parameter optimization for varying channel conditions.
2Productivity
If full-duplex communication is implemented at the same frequency and time, then channel capacity is doubled, but the transmitted signal causes strong interference to the received signal
Solution Approach 1:
The patent applies preliminary anti-action by generating a cancellation signal before it is needed for interference cancellation. The system estimates the self-interference channel characteristics in advance, generates the appropriate cancellation signal with correct delay and amplitude, and combines it with the received signal proactively, rather than reactively compensating for interference after it occurs.
Solution Approach 2:
The patent converts the harmful transmitted signal into a beneficial cancellation signal. By estimating the self-interference channel and generating a cancellation signal that mirrors the interference characteristics, the system transforms the problematic transmitted signal into a useful tool for canceling out its own interference, enabling full-duplex operation.
Data Source
AI summary
Embodiments of the present invention disclose a wireless communications method and system, and a full-duplex wireless transceiver, where the method includes: modulating a transmit digital signal into a first radio frequency signal and outputting the first radio frequency signal to a transmit antenna; then performing, under control of a pre-generated control signal, phase adjustment and amplitude adjustment on the first radio frequency signal and obtaining a cancellation signal; performing self-interference cancellation on a second radio frequency signal received from a radio air interface by using a receive antenna and the cancellation signal so as to generate a third radio frequency signal obtained after self-interference cancellation; and finally demodulating the third radio frequency signal into a receive digital signal.