Signal interference canceller and signal interference canceling method

Abstract

The invention discloses a signal interference canceller and a signal interference cancelling method. The signal interference canceller converts an electric interference signal into an optical modulation signal and then transmits the signal to an optical delay line for changing the corresponding optical length passed by the optical signal, so as to realize the delaying of the optical signal and finally converts the optical signal to an electric signal, thereby realizing to transfer the phase of a RF electric signal by (2n+1)180 degrees; wherein, n is equal to 0, 1, 2, 3, and the like; finally the interference signal which affects useful signals is filtered by cancelling. The invention can effectively remove useless signals received by a receiving terminal during the process of multi-carrier transmission; moreover, the invention is characterized by high delaying precision and high electromagnetic interference resistance.

Description

(1) Technical field [0001] The invention relates to a radio signal receiving system, in particular to a signal interference canceller and a signal interference cancel method. (2) Background technology [0002] In the field of wireless communication, in order to improve the communication capacity, multiple radio stations are usually placed in one place, each radio station transmits a different wireless carrier, and a specific signal receiving end often only needs to receive multiple carrier signals One of the carrier signals is a useful signal, so the signals carried by other carriers can be regarded as "interference" signals for the useful signal to be received. Therefore, how to effectively filter out these "interferences" is a key problem to be solved by the multi-carrier receiving end. In the prior art, an interference canceller is usually used to suppress "interference" signals outside the useful signal bandwidth at the receiving end. The purpose of the so-called inter...

AI Technical Summary

Problems solved by technology

Due to the delayed transmission of the obtained interference electrical signal directly through the microstrip line, there are deficiencies in the transmission process: large loss, low delay accuracy, poor anti-electromagnetic interference, large volume, heavy weight, small bandwidth, poor adjustability, etc. Inherent shortcomings limit the development of the canceller, especially with the delay and phase shift of the radio frequency signal with a wide frequency band and a large dynamic range, the difficulty of flexibly changing the length of the delay line on the microstrip line increases correspondingly, resulting in the failure of the interference canceller Work efficiency is significantly reduced

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