A Simultaneous Same-Frequency Full-duplex Radio Frequency Multi-subband Self-Interference Cancellation Method

Abstract

The invention relates to a simultaneous co-frequency full-duplex radio frequency multi-subband self-interference elimination method, which is an effective method for improving the broadband radio frequency self-interference cancellation performance. The steps are: firstly divide the sending signal into two paths, one path is sent to the transmitting antenna to radiate wireless signals, and the other path is sent to the radio frequency offset unit; the signal entering the radio frequency offset unit is divided into two paths by several parallel bandpass filters. Multiple sub-band signals, and reconstruct the radio frequency self-interference signal; finally, the reconstructed radio frequency self-interference signal and the self-interference signal received by the antenna are offset, and at the same time, the attenuation coefficient of each module is adjusted through the amplitude adjustment algorithm module to achieve the best self-interference cancellation effect. The present invention is applicable to a simultaneous same-frequency full-duplex radio frequency self-interference elimination method. Compared with the prior art and method, this method divides the broadband radio frequency self-interference signal into multiple narrowband signals, and the parameter that needs to be adjusted is only one item of amplitude attenuation, so Simple, reliable and better performance.

Description

A Simultaneous Same-Frequency Full-duplex Radio Frequency Multi-subband Self-Interference Cancellation Method a technical field The invention relates to a method for self-interference elimination of simultaneous and same-frequency full-duplex self-interference, in particular to a method for self-interference elimination of simultaneous and same-frequency full-duplex radio frequency multi-subband. Two background technology With the rapid development of wireless communication technology, the problem of shortage of wireless spectrum resources has become increasingly prominent. Traditional wireless duplex communication methods mainly include Frequency Division Duplexing (FDD, Frequency Division Duplexing) or Time Division Duplexing (TDD, Time Division Duplexing), and these duplex communication methods actually use two relatively independent communication channels. Simultaneous co-frequency full-duplex technology (CCFD, Co-time Co-frequency Full-Duplex), because both the sendin...

AI Technical Summary

Problems solved by technology

To sum up, most of the existing radio frequency self-interference cancellation technologies have only carried out beneficial discussions in theory, and little consideration has been given to the difficulty and complexity of specific implementation

When the RF signal bandwidth is narrow, although a certain self-interference cancellation effect can be achieved, when the RF signal bandwidth is wide, because the analog components and even the circuit board do not have ideal theoretical characteristics, the remaining inductance and capacitance values Factors such as nonlinearity and nonlinearity will cause the self-interference radio frequency signal at the receiving end to be distorted and distorted relative to the original radio frequency signal, resulting in poor actual self-interference cancellation effect, so the existing radio frequency self-interference cancellation technology needs to be further improved and improved

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