Computing method of broadband interference influence of non-linearity of power amplifier on communication system
A power amplifier and broadband interference technology, which is applied in the calculation field of the influence of power amplifier nonlinearity on communication system broadband interference, can solve the problems of reducing the receiving capacity of the communication system, blocking the RF front end of the system, and complex nonlinear models of the power amplifier.
Active Publication Date: 2013-07-10
BEIHANG UNIV
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Problems solved by technology
Among them, broadband spurs will cause interference in a very wide frequency band, greatly reducing the receiving ability of the communication system, and even blocking the RF front end of the entire system
However, due to the complexity of the nonlinear model of the power amplifier, the broadband interference of the RF power amplifier has not attracted attention, especially the interference to the receiving system in the same communication system
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] The communication platform of the present invention is as figure 1 As shown, the nonlinear transmitting system I and the linear receiving system II work on the same communication platform. The RF power amplifier in the nonlinear transmitting system I generates broadband interference due to its operation in a nonlinear state. The normal signal and broadband interference transmitted by it pass through the impedance matching network and are radiated to free space by the transmitting antenna; the receiving antenna in the linear receiving system II The above information is obtained and passed to the radio frequency receiver through the impedance matching network. Because the broadband interference arrives at the linear receiving system II simultaneously with the normal signal, it affects the communication sensitivity of the receivi...
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The invention discloses a computing method of broadband interference influence of the non-linearity of a power amplifier on a communication system, which comprises the following steps: (1) establishing a simulation model of the power amplifier, and carrying out direct current analysis on the simulation model of the power amplifier to obtain a group of characteristic graphs of the power amplifier under different working states; (2) adopting a time domain instant simulation analysis method to carry out simulation on the nonlinear amplification state of the power amplifier model under the actionof excitation signals, carrying out Fourier transformation on the simulation result, and generating the power spectrum of the broadband interference of the power amplifier model under the nonlinear distortion state; and (3) according to the power spectrum of the broadband interference of the power amplifier model under the nonlinear distortion state, analyzing the influence of the broadband interference on other communication systems in the same platform. The invention provides the computing method of the influence of the broadband interference generated by the power amplifier working in the nonlinear state on a receiving system in the platform, and realizes the computation of interference coupling of a duplex system.
Description
technical field [0001] The invention relates to a test method for electromagnetic compatibility between communication systems, more specifically, a calculation method for the influence of power amplifier nonlinearity on broadband interference of communication systems. Background technique [0002] In a communication environment consisting of sensitive receiving equipment, electromagnetic compatibility between communication systems is crucial. Power amplifiers are widely used in long-distance wireless communications. In order to obtain a larger power output signal, the power amplifier often works close to the saturation region, thereby generating nonlinear distortion. The main products of the nonlinear distortion of the power amplifier are higher harmonics of the main frequency, intermodulation distortion, intermodulation distortion and broadband spurs. Among them, broadband spurs will cause interference in a very wide frequency band, greatly reducing the receiving ability ...
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IPC IPC(8): G01R31/00
Inventor 苏东林陈文青刘跃东谢树果廖意
Owner BEIHANG UNIV