CN101685123B - Computing method of broadband interference influence of non-linearity of power amplifier on communication system - Google Patents
Computing method of broadband interference influence of non-linearity of power amplifier on communication system Download PDFInfo
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Abstract
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 action of 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
The present invention relates to the method for testing of electromagnetic compatibility between a kind of communication system, more particularly, relate to a kind of non-linearity of power amplifier to the computing method of communication system broadband interference influence.
Background technology
In the communication environment that has responsive receiving equipment to constitute, the Electro Magnetic Compatibility between each communication system is most important.Power amplifier is widely used in remote-wireless communication.In order to obtain bigger power output signal, power amplifier often is operated near the place, saturation region, and then produces nonlinear distortion.The primary product of non-linearity of power amplifier distortion is that dominant frequency higher hamonic wave, intermodulation distortion, crosstalk and broadband are spuious.Wherein the spuious meeting in broadband causes interference in a frequency band of non-constant width, greatly reduces the receiving ability of communication system, even has stopped up the radio-frequency front-end of total system.But because the complicacy of non-linearity of power amplifier model, the broadband interference of radio-frequency (RF) power amplification never arouses attention, especially to the interference of the receiving system in the same communication system.
Summary of the invention
The purpose of this invention is to provide a kind of non-linearity of power amplifier to the computing method of communication system broadband interference influence, to analyze power amplifier owing to being operated in the influence to receiving system in the platform of broadband interference that nonlinear state produces.
For achieving the above object, non-linearity of power amplifier of the present invention may further comprise the steps the computing method of communication system broadband interference influence:
1, sets up the realistic model of power amplifier, the realistic model of power amplifier is carried out dc analysis, obtain the one group performance diagram of power amplifier under the different operating state;
2, adopt the instantaneous simulation analysis method of time domain that the non-linear magnifying state of power amplifier model under the pumping signal effect carried out emulation, and simulation result carried out Fourier transform, generate the power spectrum of the broadband interference of power amplifier model under the nonlinear distortion state;
3, according to the power spectrum of the broadband interference of power amplifier model under the nonlinear distortion state, analyze broadband interference to the influence of other communication systems in the identical platform: the emission coefficient intermediate power amplifier is as follows to the operating distance computing formula of the non-linear broadband interference of receiving system:
Wherein, P
MBe the radiable peak power of emitting antenna in another communications platform that communicates with this communication system, G is antenna gain, and S is the equivalent received area of receiving antenna,
Be the power input of receiving system, SNR
LSignal to noise ratio (S/N ratio) for receiving system.
The power input of receiving system
Computing formula as follows:
Wherein, N
oBe the power spectrum density of non-linearity of power amplifier broadband interference, B is the bandwidth of receiving system, and I is the isolation between emitting antenna and receiving antenna, and this numerical value can obtain by isolation degree test.
The realistic model of power amplifier of the present invention can adopt ADS circuit analysis software building.At first from the ADS model bank, select the non-linear amplifier model, and the frequency of operation of power input amplifier, operating voltage, output power, gain margin, work efficiency and intermodulation distortion ratio parameter, obtain the realistic model of power amplifier, from the ADS simulated library, select the direct current emulator that the realistic model of power amplifier is carried out dc analysis again, obtain the one group performance diagram of power amplifier under the different operating state.
Non-linearity of power amplifier provided by the invention has the following advantages to the computing method of communication system broadband interference influence:
1, provided the broadband interference of non-linearity of power amplifier work to the computing method of the influence of receiving system in the platform, under the condition of the running parameter of clear and definite amplifier and duty, realize the interference and coupling calculating of duplex system, and provided the computing method of maximum communication distance.
2, provided the spectrum distribution of radio frequency amplifier out-of-band power and can release system to the disturbing effect of surrounding environment frequency spectrum in conjunction with antenna factor.
3, by making up the realistic model of power amplifier, interference profile feature that can the whole use frequency spectrum of express-analysis has overcome former employing analytical Calculation, calculated amount is big, computing time is a long difficult problem.
Description of drawings
Fig. 1 is the transmission of the signal between two communication systems synoptic diagram in the same communications platform of the present invention.
Fig. 2 is that non-linearity of power amplifier provided by the invention is to the process flow diagram of the computing method of communication system broadband interference influence.
Fig. 3 is one group of performance diagram of transistor emulation output.
Fig. 4 is the power spectral density plot of non-linearity of power amplifier broadband interference.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Communications platform of the present invention as shown in Figure 1, non-linear emission coefficient I and linear receiving system II are operated in same communications platform.Radio-frequency power amplifier among the non-linear emission coefficient I produces broadband interference owing to being operated in nonlinear state, and the normal signal of its emission and broadband interference are radiated free space through impedance matching network by emitting antenna; Receiving antenna among the linear receiving system II gets access to above-mentioned information, passes to radio frequency receiver through impedance matching network.Because broadband interference is accompanied by normal signal and arrives linear receiving system II simultaneously, thereby has influence on the communication sensitivity of receiving system and the communication distance between emission coefficient I and receiving system II.
Non-linearity of power amplifier provided by the invention at first carries out modeling and simulating to the radio-frequency power amplifier among the non-linear emission coefficient I to the computing method of communication system broadband interference influence, pass through the power spectrum of the broadband interference of the instantaneous emulator of time domain and Fourier transform simulation output power amplifier model under the nonlinear distortion state then, further analyze the broadband interference of power amplifier again to the influence of receiving system II in the communications platform, as shown in Figure 2, the present invention includes following steps:
(1) sets up the realistic model of power amplifier.
Adopt ADS software (advanced design system, the electronic design automation software that U.S.'s Agilent (Agilent) company produces), set up the realistic model of power amplifier, and by realistic model is carried out dc analysis, the output result of simulated power amplifier under the different operating state, the base electrode working current of combining amplifier and 1dB power compression point are determined the amplifier nonlinearity characteristic again.
It is as follows to make up the realistic model step:
At first, obtain working current value, 1db compression point output power, frequency of operation, operating voltage, output power, gain margin, work efficiency and the intermodulation distortion ratio of power amplifier.Above-mentioned parameter can be by power amplifier technical manual etc. consult.Described working current value has reflected the situation of the quiescent point of amplifier, and 1dB compression point power level has reflected the amplifier nonlinearity characteristic.
Present embodiment has adopted a high power transistor to carry out model and has set up and emulation, this transistor is linear amplifier in the scope of 2.0-30MHz, and its working current value is that 2.7A, 1db compression point output power are that 20dBm, operating voltage are that 20V, output power are that 150W, least gain are that 10dB, efficient are 40%, intermodulation distortion is-30dB.
Secondly, make up the realistic model of power amplifier.From the ADS model bank, select the non-linear amplifier model, and the frequency of operation of power input amplifier, operating voltage, output power, gain margin, work efficiency and intermodulation distortion ratio parameter, obtain the realistic model of power amplifier.From the ADS simulated library, select the direct current emulator that the realistic model of power amplifier is carried out dc analysis again, obtain the one group performance diagram of power amplifier under the different operating state.Base electrode working current and 1dB power compression point according to amplifier find a unique family curve that satisfies the amplifier actual working state from above-mentioned performance diagram, to determine the quiescent operation state point of amplifier.
Then, for the power amplifier realistic model arranges corresponding DC voltage biasing, the voltage between collector and emitter is set namely, voltage swing is the corresponding magnitude of voltage of quiescent operation state point, thereby determines the amplifier nonlinearity characteristic.
One group of performance diagram of the high power transistor emulation output that present embodiment adopts as shown in Figure 3.
(2) power spectrum of analysis non-linearity of power amplifier broadband interference.
At first from the ADS model bank, choose driving source, for the power amplifier realistic model adds pumping signal.Need signalization frequency, two parameters of signal amplitude when adding pumping signal, described signal frequency is the frequency values of the actual required amplifying signal of power amplifier, signal amplitude is the amplitude of this signal, and signal frequency is set to 2MHz in the present embodiment, and signal amplitude is 1V.
From the ADS model bank, select the instantaneous emulator of time domain then, and power amplifier model and driving source are added in the instantaneous emulator of time domain, in order to the non-linear magnifying state of power amplifier model under the pumping signal effect carried out emulation; Again above-mentioned simulation result is carried out Fourier transform afterwards, generate the broadband interference of amplifier model under the nonlinear distortion state.The power spectral density plot of the non-linear broadband interference of present embodiment intermediate power amplifier as shown in Figure 4, horizontal ordinate is the frequency of operation of amplifier, ordinate is power spectrum density.Also need to arrange following parameter when selecting the instantaneous emulator of time domain: start time, concluding time, time step.Start time, concluding time are respectively zero-time and the concluding time that the non-linear magnifying state of power amplifier model under the pumping signal effect carried out emulation, difference between concluding time and start time surpasses 300ns, and the power spectral density plot of output is almost without any change.Time step is namely extracted the cycle of a signal.Start time is 0 in the present embodiment, and the concluding time is 500ns, and time step is 1ns.
(3) according to the power spectrum of the broadband interference of power amplifier model under the nonlinear distortion state, analyze broadband interference to the influence of other communication systems in the identical platform.
Be operated in the same communications platform of emission coefficient in receiving system, owing to be subjected to emission coefficient intermediate power amplifier effect of nonlinear, under the certain situation of receiving system signal to noise ratio (S/N ratio) and sensitivity, the emission coefficient intermediate power amplifier is as follows to the operating distance computing formula of the non-linear broadband interference of receiving system:
Wherein, P
MBe the radiable peak power of emitting antenna in another communications platform that communicates with this communication system, G is antenna gain, and S is the equivalent received area of receiving antenna,
Be the power input of receiving system, SNR
LSignal to noise ratio (S/N ratio) for receiving system.
The power input of receiving system
Computing formula as follows:
Wherein, N
oBe the power spectrum density of non-linearity of power amplifier broadband interference, B is the bandwidth of receiving system, and I is the isolation between emitting antenna and receiving antenna, and this numerical value can obtain by isolation degree test.
In the present embodiment, emitting antenna is omnidirectional antenna, and the equivalent received area S of receiving antenna is 1m
2, gain G is the minimum signal to noise ratio snr of 17dB, receiving system
LFor the isolation I between 10dB, emitting antenna and receiving antenna is 33dB, the bandwidth B of receiving system is 10kHz.Be that the interference at 1.5MHz place is example with amplifier frequency of operation among Fig. 4.The power spectrum density N of the non-linear interference of this moment
oFor-28.6dBm/Hz, the power input of receiving system is
Amplifier to the maximum operating range of the non-linear broadband interference of receiving system is
Claims (3)
1. a non-linearity of power amplifier may further comprise the steps the computing method that the communication system broadband interference influences:
1) sets up the realistic model of power amplifier, the realistic model of power amplifier is carried out dc analysis, obtain the one group performance diagram of power amplifier under the different operating state; The realistic model of described power amplifier adopts ADS circuit analysis software building, performing step is: select the non-linear amplifier model in the ADS model bank, and the frequency of operation of power input amplifier, operating voltage, output power, gain margin, work efficiency and intermodulation distortion ratio parameter, obtain the realistic model of power amplifier, from the ADS simulated library, select the direct current emulator that the realistic model of power amplifier is carried out dc analysis again, obtain the one group performance diagram of power amplifier under the different operating state;
2) adopt the instantaneous simulation analysis method of time domain that the non-linear magnifying state of power amplifier model under the pumping signal effect carried out emulation, and simulation result carried out Fourier transform, generate the power spectrum of the broadband interference of power amplifier model under the nonlinear distortion state;
3) according to the power spectrum of the broadband interference of power amplifier model under the nonlinear distortion state, analyze broadband interference to the influence of other communication systems in the identical platform: the emission coefficient intermediate power amplifier is as follows to the operating distance computing formula of the non-linear broadband interference of receiving system:
Wherein, P
MBe the radiable peak power of emitting antenna of another communications platform of communicating with this communication system, G is antenna gain, and S is the equivalent received area of receiving antenna,
Be the power input of receiving system, SNR
LSignal to noise ratio (S/N ratio) for receiving system; The power input of receiving system
Computing formula as follows:
Wherein, N
oBe the power spectrum density of non-linearity of power amplifier broadband interference, B is the bandwidth of receiving system, and I is the isolation between emitting antenna and receiving antenna.
2. according to the computing method of the described non-linearity of power amplifier of claim 1 to the influence of communication system broadband interference, it is characterized in that the instantaneous simulation analysis method of the described time domain of step 2 adopts ADS circuit analysis software building, performing step is: at first choose driving source from the ADS model bank, signalization frequency, two parameters of signal amplitude, described signal frequency is the frequency values of the actual required amplifying signal of power amplifier, and signal amplitude is the amplitude of this signal; From the ADS model bank, select the instantaneous emulator of time domain then, start time, concluding time, time step are set, described start time, concluding time are respectively zero-time and the concluding time that the non-linear magnifying state of power amplifier model under the pumping signal effect carried out emulation, described time step is added power amplifier model and driving source in the instantaneous emulator of time domain to for extracting the cycle of a signal again; Again above-mentioned simulation result is carried out Fourier transform afterwards, generate the broadband interference of amplifier model under the nonlinear distortion state.
3. according to the computing method of the described non-linearity of power amplifier of claim 2 to the influence of communication system broadband interference, it is characterized in that described time step is Ins.
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| CN102176689A (en) * | 2011-03-04 | 2011-09-07 | 航天东方红卫星有限公司 | Method for determining isolation between antennas |
| CN105067989B (en) * | 2015-07-06 | 2019-02-15 | 电子科技大学 | A kind of general power amplifier Auto-Test System and its automatic test approach |
| CN108268705B (en) * | 2017-12-30 | 2021-08-31 | 中国电子科技集团公司第十三研究所 | Microwave circuit nonlinear model establishing method, measuring system and terminal equipment |
| CN114006627B (en) * | 2020-07-27 | 2023-04-25 | 瑞昱半导体股份有限公司 | Isolation estimation system, method and processing circuit |
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| US4809336A (en) * | 1987-03-23 | 1989-02-28 | Pritchard Eric K | Semiconductor amplifier with tube amplifier characteristics |
| EP1404038A1 (en) * | 2002-09-30 | 2004-03-31 | Lucent Technologies Inc. | Method for reduction of non-linear distortions in an optical transmission channel |
| CN1667970A (en) * | 2005-04-28 | 2005-09-14 | 北京航空航天大学 | Distribution method for internal noise of receiver RF system circuit |
| CN101241155A (en) * | 2007-02-09 | 2008-08-13 | 扬州奥瑞科技有限公司 | Electric power apparatus integrated automated detection system |
| CN101276379A (en) * | 2007-11-16 | 2008-10-01 | 民航数据通信有限责任公司 | UAT data chain OPNET simulation model related to ADS-B |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4809336A (en) * | 1987-03-23 | 1989-02-28 | Pritchard Eric K | Semiconductor amplifier with tube amplifier characteristics |
| EP1404038A1 (en) * | 2002-09-30 | 2004-03-31 | Lucent Technologies Inc. | Method for reduction of non-linear distortions in an optical transmission channel |
| CN1667970A (en) * | 2005-04-28 | 2005-09-14 | 北京航空航天大学 | Distribution method for internal noise of receiver RF system circuit |
| CN101241155A (en) * | 2007-02-09 | 2008-08-13 | 扬州奥瑞科技有限公司 | Electric power apparatus integrated automated detection system |
| CN101276379A (en) * | 2007-11-16 | 2008-10-01 | 民航数据通信有限责任公司 | UAT data chain OPNET simulation model related to ADS-B |
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