Full-Duplex Radio Interference Cancellation via Dual-Polarized Antennas
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Solution Overview
Problem
Current full-duplex radio communication systems face challenges with high requirements for the number of antennas and position accuracy, limited interfering signal elimination, and high costs due to the inability to effectively implement receiving and sending at the same frequency and time.
Innovation Solution
A full-duplex radio communication device utilizing a dual-polarized antenna with an analog domain cancellation module and a digital domain cancellation module, where the dual-polarized antenna provides orthogonal isolation, and the combined cancellation modules enhance interfering signal elimination, reducing the need for precise antenna positioning and number of antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If two transmitting antennas and one receiving antenna are adopted with null elimination, then interfering signal elimination effect is improved (around 30 dB), but requirements on the number of antennas and position accuracy increase, and cost increases
Solution Approach 1:
The patent divides the interfering signal cancellation into two separate domains: analog domain cancellation and digital domain cancellation. The analog domain cancellation module handles the strong coupled signal using analog processing, while the digital domain cancellation module handles residual interference using digital signal processing. This segmentation allows each module to be optimized independently, reducing the overall system complexity and antenna requirements while achieving better than 30 dB cancellation.
Solution Approach 2:
The patent introduces an intermediate analog domain cancellation stage between the receiving antenna and the digital processor. This intermediary analog processing stage pre-cancels the strong coupled signal before it enters the digital domain, reducing the burden on the digital processor and allowing for simpler antenna configurations. The analog cancellation module acts as a mediator that handles the bulk of the interference removal.
2Reliability
If transmitting power is increased to overcome path loss, then received signal quality is improved, but receiver blocking occurs and dynamic range requirements increase
Solution Approach 1:
The patent converts the harmful effect of the strong transmitted signal (which causes receiver blocking) into a useful element by capturing it through a coupling mechanism and using it as a reference in the analog domain cancellation module. The same transmitted signal that would otherwise block the receiver is now used to generate an anti-phase signal for cancellation, turning the harmful interference into a beneficial reference for eliminating other interfering signals.
Solution Approach 2:
The patent applies preliminary anti-action by pre-generating a cancellation signal in the analog domain that is equal in magnitude but opposite in phase to the expected interfering signal. This cancellation signal is subtracted from the received signal before it enters the digital processor, preventing the interfering signal from causing blocking or exceeding dynamic range limitations in subsequent processing stages.
3Adaptability or versatility
If FDD or TDD modes are used to separate transmitting and receiving, then receiver blocking is avoided, but full-duplex communication (simultaneous receiving and sending at same frequency) cannot be achieved
Solution Approach 1:
The patent enables continuous full-duplex operation by implementing simultaneous transmitting and receiving at the same frequency through analog domain cancellation. The cancellation module continuously subtracts the coupled transmitted signal from the received signal, allowing uninterrupted full-duplex communication without the need to switch between FDD and TDD modes. This provides continuous useful action in both directions simultaneously.
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 eliminates interfering signals, reduces system costs, and enables reliable full-duplex communication by achieving significant interference suppression, improving the practicality and efficiency of radio communication systems.
Implementation Method 1
a dual-polarized antenna, an analog domain cancellation module and a digital domain cancellation module, in which a first polarized antenna in the dual-polarized antenna is configured to output a transmitted signal, and a second polarized antenna is configured to acquire a received signal
Data Source
AI summary
A full-duplex radio communication device, method and system are provided. A first polarized antenna in a dual-polarized antenna outputs a transmitted signal, and a second polarized antenna acquires a received signal which includes a first transmitted sub-signal that is directly coupled from the first polarized antenna. An analog domain cancellation module acquires a second transmitted sub-signal coupled from the transmitted signal, adjusts an amplitude and a phase parameter of the second transmitted sub-signal to convert the second transmitted sub-signal into a third transmitted sub-signal, eliminates the first transmitted sub-signal according to the third transmitted sub-signal, samples the received signal, from which the first transmitted sub-signal is eliminated, as a first digital signal, samples the second transmitted sub-signal as a second digital signal, and outputs the first digital signal and the second digital signal to a digital domain cancellation module.