Method for eliminating self interference of multiple same-time same-frequency full-duplex radio frequency sub bands

Abstract

The invention relates to a method for eliminating self interference of multiple same-time same-frequency full-duplex radio frequency sub bands. The method can effectively improve the broadband radio frequency self interference elimination performance. The method comprises the steps that firstly, sending signals are divided to two paths, one path of sending signals are sent to a transmitting antennas to radiate out wireless signals, and the other path of sending signals are sent to a radio frequency counteracting unit; the signals entering the radio frequency counteracting unit are divided to multiple sub band signals through multiple parallel band-pass filters, and radio frequency self interference signals are reconstructed; finally, the reconstructed radio frequency self interference signals counteract the self interference signals received by the antennas, the attenuation coefficients of all modules are regulated through an amplitude adjustment algorithm, and the best self interference signal counteracting effect is achieved. Compared with the prior art and method, the method for eliminating the self interference of the multiple same-time same-frequency full-duplex radio frequency sub bands divides the broadband radio frequency self-interference signals to multiple narrow-band signals, only the amplitude attenuation parameter needs to be regulated, and therefore the method is easy to implement, reliable, and better in performance.

Description

a technical field [0001] 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 [0002] 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 sending and receiving signals use the same frequency band at the same time, the spectral efficiency ca...

AI Technical Summary

Problems solved by technology

[0007] 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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