A radio frequency self-interference cancellation device and method with multiple interference sources and wide frequency coverage

Abstract

The invention discloses a radio frequency self-interference cancellation device and method with multiple interference sources and wide frequency coverage, including a multi-interference source interference reference signal down-conversion module, a multi-interference source radio frequency domain interference reconstruction module, an interference reconstruction signal up-conversion module, and a synthesis Interference cancellation module, power division module and interference control module. The present invention obtains multiple fixed intermediate frequency interference reference signals by down-converting multiple channels of wide-frequency interference reference signals, and reconstructs each channel of interference reference signals through the multi-interference source radio frequency domain interference reconstruction module controlled by the interference control module. Reconstruction signals from various channels are synthesized to obtain multi-interference source interference reconstruction signals. After up-converting and returning to a wide frequency range, they are input to the interference synthesis and cancellation module to synthesize with the interfered radio frequency receiving signals to achieve interference cancellation and reduce the complexity of interference reconstruction.

Description

technical field [0001] The invention relates to self-interference cancellation, in particular to a radio frequency self-interference cancellation device and method with multiple interference sources and wide frequency coverage. Background technique [0002] At the same time, the same-frequency full-duplex technology breaks through the limitation of time-frequency resource utilization of existing time-division duplex and frequency-division duplex, and has the ability to double the spectrum efficiency. Since the local transmitter and receiver transmit and receive at the same time and frequency at the same time, the transmitted signal of the local transmitter will cause strong self-interference to the local receiver. In order to ensure normal communication, the receiver needs to effectively suppress the self-interference. [0003] In the process of suppressing self-interference signals, it is often necessary to reconstruct radio frequency self-interference signals. However, in ...

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Problems solved by technology

[0003] In the process of suppressing self-interference signals, it is often necessary to reconstruct radio frequency self-interference signals. However, in the process of self-interference cancellation in the radio frequency domain covered by wide frequency (such as 30MHz~6000MHz), due to the wide frequency coverage, if the direct Reconstructing the interference signal will have the problems of difficulty in implementation, high device cost, and high reconstruction complexity; especially in the case of multiple interference sources, it is necessary to perform self-interference signal reconstruction and cancellation for multiple interference sources, and directly reconstruct the interference signal will further increase the implementation difficulty and cost of the device

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