Wideband Signal Cancellation Method Based on Convex Combination Adaptive Filtering Algorithm

Abstract

The invention provides a broadband signal cancellation method based on convex combination self-adaptive filtering algorithm. The method comprises the following steps of (1) extracting a received composite signal via a front end radio frequency module and dividing the signal into IQ two orthogonal signals, (2) unstring and decelerating the IQ orthogonal signals, and dividing the orthogonal signals into 16 sub-modules, each of which is input by two paths, one path inputting a demodulation module, one path inputting a convex combination self-adaptive filtering module for signal cancellation, (3) generating a transmitting signal for a cancellation signal having a transmitting module, and dividing the transmitting signal into two paths, one path emitted by an antenna end for detection or relay communication and one path conducting waveform prediction for emission signal echo interference of a self-adaptive module referring signal fed back to a self-adaptive module, (4) repeating the step 2 and 3 until an error of mean square reaches a minimum value, and (5) outputting a self-adaptive cancellation result. Work performance of the self-adaptive filtering scheme under the broadband signal is improved, and misjudgment upon co-frequency signal can be eliminated; and calculation complexity is reduced and the method is easy to operate.

Description

Technical field [0001] The invention designs a high-speed digital signal processing method, specifically a method for eliminating interference in the S and X bands. Background technique [0002] In modern wireless communication systems, the signal coupling phenomenon between the echo of the transmitting antenna and the receiving antenna has always been a common problem in electronic systems with duplex transmission and reception. In this type of transceiver coupling problem, it is particularly difficult to cancel the forwarding transceiver coupling. The difficulty lies in the fact that the system transmitting and receiving signals are often at the same distance or close distance, the same frequency, the same direction, and the same bandwidth, and the radiation power of the transmitting end is very high. Large, much higher than the sensitivity of the receiving device. The poor transmission and reception isolation can reduce the actual sensitivity of the reconnaissance receiver an...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main measures to solve the isolation of sending and receiving: one is to reduce the receiving sensitivity of the system;

The first mode sacrifices the sensitivity of system communication and reduces the working distance

The second mode is prone to communication interruption, which affects the communication effect

The patent document with publication number CN 104601837B uses a convex combination adaptive filtering method to eliminate telephone echo, but the operating frequency of telephone echo is low, the bandwidth is narrow, and the signal-to-interference ratio is not high, and the requirements for system structure and processing rate are low

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