Same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method

Abstract

The invention discloses a same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method. A wireless unit receiving end outputs self-interference signals, self-interference offset is not conducted at first, after being processed by a radio frequency receiving channel and an analog-digital converter, the self-interference signals are sent to a pattern recognition module to generate an adjustment value, multiple taps are controlled to interfere in a reconstruction filter to reconstruct sending end radio frequency signals in a radio frequency mode, radio frequency self-interference offset is conducted on output reconstruction signals through a summator, signals after the radio frequency self-interference offset are sent to an adjustment algorithm module again through the radio frequency receiving channel and the analog-digital converter to obtain digital signals which are sent to the adjustment algorithm module, an adjusting value needed for adjusting the time delay zero is obtained, radio frequency interference reconstruction is further controlled, controlling over the radio frequency interference reconstruction is carried out repeatedly according to the method, and self-interference offset is achieved. According to the same-time same-frequency full duplex multi-tap radio frequency self-interference offset system and method, joint control of the pattern recognition module and the adjustment algorithm module is used, same-time same-frequency-radio self-interference can be removed effectively, the frequency spectrum utilization rate is improved, the radio frequency self-interference offset performance is improved, and the working stability of communication equipment is guaranteed.

Description

technical field [0001] The invention relates to a method for removing interference in the field of wireless communication, in particular to a simultaneous same-frequency full-duplex multi-tap radio frequency self-interference canceling system and method. Background technique [0002] Current actual wireless communication systems all adopt the duplexing mode of TDD (Time Division Duplexing) or FDD (Frequency Division Duplexing). The TDD duplex system uses the same frequency but different time slots to transmit data, thereby isolating the interference between the uplink and downlink. The FDD duplex system uses the same time slot but different frequencies to transmit data, thereby isolating the interference between the 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] If a simultaneous co-frequency full duplex (Co-frequ...

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Problems solved by technology

However, this method only illustrates a simultaneous co-channel interference suppression mechanism, and does not explain an effective method for radio frequency interference suppression in multi-antenna or multipath environments

[0009] In summary, the existing radio frequency self-interference cancellation technical solutions do not effectively consider the impact of multi-antenna scenarios or multipath environments on radio frequency self-interference signals. These problems will inevitably lead to poor radio frequency self-interference cancellation performance

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