Simultaneous, cofrequency and full-duplex radio-frequency-domain rapid self-interference suppression system and method thereof

Abstract

The invention discloses a simultaneous, cofrequency and full-duplex radio-frequency-domain rapid self-interference suppression system and a method thereof. The system comprises a radio frequency emission channel, an emission antenna, a radio frequency receiving channel, a receiving antenna, a time delay device, an interference reconstruction branch, a dimension reduction operation branch and a subtracter. By using the simultaneous, cofrequency and full-duplex radio-frequency-domain rapid self-interference suppression system and the method thereof, when a phase shift value of a second adjustable phase shift circuit is set to be 0 degree and 90 degree, an output signal of the second adjustable phase shift circuit and a signal received by the receiving antenna are multiplied through the multiplier; and according to a signal output by the multiplier under the two phase shift values, an optimal phase shift value and an attenuation value are calculated, and an adjustable attenuator and a first adjustable phase shift circuit are adjusted. Two-dimensional solutions of optimal values of the adjustable attenuator and the first adjustable phase shift circuit are converted into an one-dimensional solution and subsequent calculating related to a receiving self-interference signal and a self-interference reference signal, and a convergence speed of radio-frequency-domain self-interference suppression is increased.

Description

technical field [0001] The invention relates to a simultaneous and same-frequency full-duplex radio frequency domain rapid self-interference suppression system and method. Background technique [0002] Current wireless communication systems use time division duplex or frequency division duplex methods for two-way communication. A time-division duplex system uses the same frequency but different time slots to transmit data, thereby isolating interference between uplink and downlink. A frequency division duplex system 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 increasing day by day, but the congestion of space wireless channels is becoming more an...

AI Technical Summary

Problems solved by technology

[0004] However, when the transmitting end and the receiving end of the wireless communication device work at the same frequency at the same time, the transmitted signal generated by the transmitting end will enter the receiving channel of the receiving end, forming self-signal interference, which is far stronger than the signal received by the receiving end. The signal strength of the remote wireless communication device seriously affects the reception of the signal sent by the remote wireless device at the receiving end

Usually, this will reduce the sensitivity of the receiving end, increase the bit error rate, and lead to a decrease in communication performance

[0005] Therefore, it is very important to perform self-interference suppression in the radio frequency domain for the received signal of the full-duplex transceiver. At present, the self-interference suppression components in the full-duplex transceiver mainly include a delayer, an adjustable attenuator and an adjustable phase shifter. The self-interference suppression structure in the single-tap radio frequency domain, but the two-dimensional solution of the optimal value of the adjustable attenuator and the adjustable phase shifter is a solution of a non-convex optimization problem, which leads to a slow convergence speed of the self-adaptive interference suppression in the radio frequency domain

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