Simultaneous common-frequency full duplex self-interference offset method in multi-path environment

Abstract

The invention discloses a simultaneous common-frequency full duplex self-interference offset method in a multi-path environment. The method comprises the steps that in the transmission end, a digital signal to be transmitted is sent to a signal pre-correction module and a digital interference offset module, and a radio frequency signal to be transmitted is sent to a radio frequency interference reconstruction unit. The signal outputted by the signal pre-correction module passes through a DAC (digital-to-analog converter) and a transmission radio frequency channel to form a pre-corrected radio frequency signal. In the receiving end, the outputted self-interference signal subtracts the pre-corrected radio frequency signal and the radio frequency signal processed by the radio frequency interference reconstruction unit, the radio frequency self-interference offset is finished, and the offset signal, the pre-corrected radio frequency signal and the converted digital signal are sent to the digital interference offset module to finish the digital interference offset, together with the digital signal to be transmitted and the pre-corrected digital signal. The simultaneous common-frequency full duplex self-interference offset method under the multi-path environment is applicable to a simultaneous common-frequency system, the utilization rate of spectrum is doubled, the radio frequency self-interference offset performance is improved, the communication quality of the system is improved, and the working stability of communication equipment in a simultaneous common-frequency multi-path environment is improved.

Description

technical field [0001] The invention relates to a method for removing interference in the field of wireless communication, in particular to a method for canceling self-interference of simultaneous and same-frequency full-duplex self-interference in a multipath environment. Background technique [0002] Current wireless communication systems use time division duplex or frequency division duplex methods for two-way communication. The TDD system uses the same frequency but different time slots to transmit data, thereby isolating the interference between the uplink and downlink. Frequency division duplexing uses the same time slot but different frequencies to transmit data, thereby isolating interference between uplink and downlink. These two duplex methods sacrifice time resources and frequency resources respectively in the process of isolating the uplink and downlink, resulting in low spectrum utilization. [0003] In today's society, the demand for wireless data services is...

AI Technical Summary

Problems solved by technology

However, this method does not consider the radio frequency self-interference cancellation of the joint transmitter and does not eliminate the influence of nonlinearity and phase noise on the performance of self-interference cancellation

[0009] To sum up, the existing self-interference cancellation technical solutions either do not consider the multipath environment, or only consider the adjustment of the self-interference signal at the receiving end. These problems will inevitably lead to poor RF self-interference cancellation performance in the multipath environment.

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