Device and method for radio frequency self-interference cancellation with wide frequency coverage

Abstract

The invention discloses a radio frequency self-interference cancellation device and method with wide frequency coverage, comprising an interference reference signal down-conversion module, a radio frequency domain interference reconstruction module, an interference reconstruction signal up-conversion module, a synthetic interference cancellation module, a power division module and Interference control module; the output end of the interference reference signal down-conversion module is connected to the power division module through the radio frequency domain interference reconstruction module, the interference reconstruction signal up-conversion module, and the synthetic interference cancellation module. It is divided into two channels, one for external output and one for feedback to the interference control module. The present invention converts the interference reference signal to a fixed intermediate frequency by down-converting the wide-frequency interference reference signal, obtains the reconstruction signal through the interference reconstruction module in the radio frequency domain, and then up-converts the reconstruction signal back to the radio frequency wide frequency, and inputs it to the interference synthesis and cancellation module Combined with the interfered radio frequency receiving signal to achieve interference cancellation and reduce the complexity of interference reconstruction.

Description

technical field [0001] The invention relates to self-interference cancellation, in particular to a radio frequency self-interference cancellation device and method with wide frequency coverage. Background technique [0002] At the same time, the same-frequency full-duplex technology breaks through the limitation of time-frequency resource utilization of existing time-division duplex and frequency-division duplex, and has the ability to double the spectrum efficiency. Since the local transmitter and receiver transmit and receive at the same time and frequency at the same time, the transmitted signal of the local transmitter will cause strong self-interference to the local receiver. In order to ensure normal communication, the receiver needs to effectively suppress the self-interference. [0003] In the process of suppressing self-interference signals, it is often necessary to reconstruct radio frequency self-interference signals. However, in the process of self-interference c...

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Problems solved by technology

[0003] In the process of suppressing self-interference signals, it is often necessary to reconstruct radio frequency self-interference signals. However, in the process of self-interference cancellation in the radio frequency domain covered by wide frequency (such as 30MHz~6000MHz), due to the wide frequency coverage, if the direct Reconstructing the interference signal will have the problems of difficulty in implementation, high device cost, and high reconstruction complexity

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