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Interference Mechanism Analysis Method of Radio Frequency Front-end of Communication Receiver

A communication receiver and radio frequency front-end technology, applied in receiver monitoring, transmission systems, electrical components, etc., can solve the problems of receiver system modeling without the use of signals and interference signals, and the inability to accurately reveal the mechanism of different types of interference.

Active Publication Date: 2022-03-29
NAVAL UNIV OF ENG PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previous studies have not modeled the receiver system containing the desired signal and the interference signal at the same time, and cannot accurately reveal the mechanism of action of different types of interference

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0032] Taking the AM communication method as an example, the useful signal received is:

[0033] ν u (t) = [A u +m(t)]cosω u t

[0034] Among them, A u is the magnitude, ω u is the carrier frequency, m(t) is the modulating signal.

[0035] Taking two AM interferences with the same parameters as an example, it can be understood as two AM transmitter signals causing co-site interference, expressed as:

[0036] v i1 (t) = [A i1 +m i1 (t)]cosω i1 t, v i2 (t) = [A i2 +m i2 (t)]cosω i2 t

[0037] The receiver input signal can be expressed as:

[0038] v in (t) = [A u +m(t)]cosω u t+[A i1 +m i1 (t)]cosω i1 t+[A i2 +m i2 (t)]cosω i2 t

[0039] Order V u =A u +m(t), V i1 =A i1 +m i1 (t), V i2 =A i2 +m i2 (...

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Abstract

The invention provides a method for analyzing the interference mechanism of the radio frequency front end of a communication receiver. According to the radio frequency front end circuit of the receiver, a nonlinear mathematical model of the communication receiver under interference is established, the interference mechanism and interference characteristics are found out, and useful Different types of interference formed under different frequency relationship conditions of signal and interference signal, and the quantitative analysis method of the generation conditions of interference and the strongest interference of each type are obtained. Using the above analysis results and the minimum signal-to-noise ratio requirements of the receiver, the maximum interference signal that does not affect the reception of the useful signal is calculated. Combined with the actual interference signal size, the quantitative suppression requirements of the interference signal are finally obtained, and the quantitative design of the interference cancellation device index is realized. The invention can not only accurately clarify the action mechanism of different types of interference formed under the simultaneous action of useful signals and interference signals, but also accurately calculate interference suppression requirements, and realize the quantitative suppression design of co-site interference in communication systems.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility analysis and design, in particular to a method for analyzing the interference mechanism of a radio frequency front end of a communication receiver. Background technique [0002] Independent platforms such as ships, tanks, and fighters are equipped with a variety of communication, radar, and electronic warfare equipment. The common point of these equipment is that they all need to use antennas to complete signal transmission or reception, resulting in dense antennas on the platform and mutual space. Insufficient isolation. The transmitting antenna transmits a high-power signal to the remote receiver, and the receiver receives the weak communication signal from the remote. The local transmitted signal is a useless signal for the local receiver, which is a strong co-location interference signal. When the distance between the transmitting antenna and the receiving antenna is rel...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B17/29
CPCH04B1/1027H04B17/29
Inventor 孟进赵治华王青李毅何方敏唐健
Owner NAVAL UNIV OF ENG PLA