CN110166063B - Radio frequency front end spread spectrum and despreading processing method based on amplifier drain modulation effect - Google Patents

Radio frequency front end spread spectrum and despreading processing method based on amplifier drain modulation effect Download PDF

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CN110166063B
CN110166063B CN201910412263.6A CN201910412263A CN110166063B CN 110166063 B CN110166063 B CN 110166063B CN 201910412263 A CN201910412263 A CN 201910412263A CN 110166063 B CN110166063 B CN 110166063B
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spread spectrum
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signals
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CN110166063A (en
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曹韬
马建平
马鑫冰
刘友江
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Institute of Electronic Engineering of CAEP
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/709—Correlator structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract

The invention discloses a radio frequency front end spread spectrum and de-spread spectrum prescription method based on an amplifier drain modulation effect, and relates to the technical field of wireless communication. The invention divides the input radio frequency signal, then shifts the phase of one path of signal by 180 degrees to generate two branches of radio frequency signals, the two branches of radio frequency signals are respectively transmitted to two power amplifiers or two low noise amplifiers, the multiplication of each branch of radio frequency spread spectrum signal and the drain power supply signal of the power amplifier or the low noise amplifier corresponding to the branch is realized by utilizing the drain modulation effect, and the spread spectrum or the de-spread spectrum processing is completed.

Description

Radio frequency front end spread spectrum and despreading processing method based on amplifier drain modulation effect
Technical Field
The invention relates to the technical field of wireless communication, in particular to a spread spectrum modulation and demodulation method of a wireless communication direct sequence spread spectrum technology, and particularly relates to a radio frequency front end spread spectrum and de-spread spectrum processing method based on a drain modulation effect of a methodor.
Background
The spread spectrum communication technology has better anti-interference performance, and has the capabilities of multiple access, security, confidentiality, multipath resistance and the like, so the spread spectrum communication technology is widely applied to the field of military and civil wireless communication. Direct sequence spread spectrum (DS) is a typical spread spectrum modulation method that spreads the information to be transmitted to a wider frequency band with a pseudo-random (PN) sequence, while performing correlation processing on the received signal at the receiving end using the same pseudo-random sequence, thereby recovering the original information. At present, the direct sequence spread spectrum system can realize spread spectrum modulation and demodulation functions in an analog domain or a digital domain. In the analog domain, a surface acoustic wave correlator is generally adopted to complete the spread spectrum and the de-spread spectrum, and in the digital domain, the spread spectrum and the de-spread spectrum can be realized through a baseband digital processing mode.
The baseband digital spread spectrum and de-spread processing mode is to generate pseudo-random code in digital domain, and form spread spectrum sequence after 2-mode addition operation with signal code, the spread spectrum sequence is converted into analog signal by digital-to-analog converter (DAC), then frequency conversion is carried out to carrier frequency. At the receiving end, after the spread spectrum signal is subjected to low-noise amplification and down-conversion, a pseudo-random sequence synchronous with the transmitting end is adopted in a digital domain to de-spread the spread spectrum modulation signal.
The technical disadvantages are as follows: the baseband digital spread spectrum and de-spread spectrum processing mode can flexibly adjust spread spectrum codes, but the mode needs to complete the whole spread spectrum and de-spread spectrum process in a digital domain, and the bandwidth of a signal after spread spectrum is greatly improved, so that the method has higher requirement on the broadband signal processing capacity of a digital device. In addition, in a direct spread communication system adopting baseband digital spread spectrum despreading processing, under an unpredictable strong interference environment (especially in a same-frequency in-band interference mode), a radio frequency front end of a receiver generates a blocking phenomenon due to nonlinear distortion, so that a receiving link gain is reduced, a signal-to-noise ratio of a received signal is seriously deteriorated, and a back end digital processing module cannot normally realize a despreading and demodulation function.
The specific sound-electricity conversion mechanism of the surface acoustic wave device enables the surface acoustic wave device to have the function of realizing related complex signal processing and the like. By utilizing the surface acoustic wave tap delay line structure, components such as a code modulator (spread spectrum modulator), a matched filter (de-spread demodulator) and the like can be designed, so that signal spreading and de-spreading are realized in a radio frequency domain. The spreading code is determined by the hardware structure of the surface acoustic wave device itself.
The technical disadvantages are as follows: because the pseudo-random code is determined by the physical structure of the surface acoustic wave tapped delay line, once the design of a device is finished, the pseudo-random code pattern cannot be flexibly configured; in addition, the device length (or tap number) of the surface acoustic wave tapped delay line is limited due to large insertion loss and limited physical characteristics of the substrate; meanwhile, due to the influence of the development process level of the device, the working frequency of the device is not high, and the application range of the device is limited.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a radio frequency front end spread spectrum and despreading processing method based on the drain modulation effect of an amplifier.
In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:
a radio frequency front end spread spectrum and de-spread spectrum processing method based on the modulation effect of an amplifier drain electrode is characterized in that: the method comprises a radio frequency front end spread spectrum processing method and a radio frequency front end de-spread spectrum processing method;
the radio frequency front end spread spectrum processing method specifically comprises the following steps: the input radio frequency signal is input into a power divider, the power divider divides the input radio frequency signal into equal power, and one path of signal after equal power division is subjected to 180-degree phase shift processing through a phase shifter to generate two paths of radio frequency signals; the two branch radio-frequency signals are respectively sent into a power amplifier 1 and a power amplifier 2, the power amplifier 1 and the power amplifier 2 respectively utilize the drain electrode modulation effect of the power amplifier to realize the multiplication of the radio-frequency signals of each branch and the drain electrode power supply signals of the power amplifier corresponding to the radio-frequency signals of the branch, complete the direct sequence spread spectrum processing and provide power gain for the signals after the spread spectrum; the power amplifier 1 and the power amplifier 2 input the output signals into a synthesizer, the synthesizer performs power synthesis on the signals output by the power amplifier 1 and the power amplifier 2, eliminates carrier leakage, and finally outputs a radio frequency domain spread spectrum signal;
the radio frequency front end de-spreading processing method specifically comprises the following steps: inputting a radio frequency spread spectrum signal to be despread into a power divider, dividing the input radio frequency spread spectrum signal by the power divider in an equal power way, and performing 180-degree phase shift processing on one path of signal after equal power division by a phase shifter to generate two paths of radio frequency spread spectrum signals; in the two branches of radio frequency spread spectrum signals, the low noise amplifier 1 and the low noise amplifier 2 respectively realize the multiplication of the radio frequency spread spectrum signals of each branch and the drain power supply signal of the low noise amplifier corresponding to the branch by using the drain modulation effect of the low noise amplifier, so as to complete the de-spreading processing, and simultaneously perform power gain on the de-spread signals; the low noise amplifier 1 and the low noise amplifier 2 input the output despread signals into a synthesizer, the synthesizer performs power synthesis on the two branch despread signals, the synthesized signal is input into a filter, and the filter performs filtering processing on the synthesized despread signal to complete despreading in the radio frequency domain.
The drain modulation effect of the power amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence spread spectrum are respectively generated for two branch radio frequency signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 respectively receive two paths of code type signals output by the PN code configurator, the power supply modulators correspond to the power amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 respectively complete power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the two branch power amplifiers is realized.
The drain modulation effect of the low noise amplifier specifically means: pseudo-random codes PN1 and PN2 required by direct sequence despreading are respectively generated for two branch radio frequency spread spectrum signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 are used for receiving two paths of code type signals output by the PN code configurator respectively, the power supply modulators correspond to the low noise rate amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 are used for completing power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the low noise amplifiers of the two branches is realized.
The spread spectrum processing method is specifically expressed as follows: the input radio frequency signal being RFinEnvelope information carried by the carrier wave is a (t), and carrier frequency is omegacInitial phase of
Figure BDA0002063191090000031
The signal may be expressed as:
Figure BDA0002063191090000032
the signal is divided by equal power of the power divider, and after 180-degree phase shift is carried out on one path of signal, two branches of radio frequency signals are generated:
Figure BDA0002063191090000033
Figure BDA0002063191090000034
the two branches of radio frequency signals are respectively sent to the power amplifier 1 and the power amplifier 2, and based on the modulation effect of the drain of the power amplifier, the output signals of the two power amplifiers can be represented as follows:
Figure BDA0002063191090000035
Figure BDA0002063191090000036
after being synthesized by the synthesizer, the output signal is:
Figure BDA0002063191090000037
since PN1 and PN2 satisfy the constraint of PN1+ PN2 being 0, the output signal can be expressed as:
Figure BDA0002063191090000038
the output signal is in a direct sequence spread spectrum signal representation form, the carrier leakage component of a single branch is eliminated, and the spread spectrum function of a radio frequency domain is realized.
The despreading processing method is specifically expressed as follows: input radio frequency spread spectrum signal is RFi'nThe signal may be expressed as:
Figure BDA0002063191090000041
the signal is divided by equal power of the power divider, and after 180-degree phase shift is carried out on one path of signal, two branches of radio frequency signals are generated:
Figure BDA0002063191090000042
Figure BDA0002063191090000043
the two branches of radio frequency signals are respectively sent to a low noise amplifier 1 and a low noise amplifier 2, and based on the modulation effect of the drain electrode of the low noise amplifier, the two branches of output signals can be expressed as follows:
Figure BDA0002063191090000044
Figure BDA0002063191090000045
after being synthesized by the synthesizer, the output signal is:
Figure BDA0002063191090000046
since PN1 and PN2 satisfy the constraint of PN1+ PN2 being 0, the output signal can be expressed as:
Figure BDA0002063191090000047
since PN2 is a pseudo-random balanced code, the structure realizes the despreading function of the radio frequency domain.
Compared with the prior art, the beneficial technical effects brought by the application are shown in that:
the closest prior art proposed by the application is a spread spectrum and de-spread spectrum method based on a surface acoustic wave correlator, both of which can perform signal spread spectrum and de-spread spectrum processing on an analog/radio frequency domain, and the technical advantages of the invention are expressed in comparison with the following steps:
1. compared with the spread spectrum de-spreading technology based on the surface acoustic wave correlator, the invention has more flexible spread spectrum code configuration capability. The pseudo-random code of the acoustic surface wave correlator is determined by the physical structure of the acoustic surface wave tap delay line, and once the design of a device is finished, the pseudo-random code pattern cannot be flexibly configured; the scheme of the invention generates any spread spectrum code pattern in a digital domain through the PN code configurator, can change the length of the spread spectrum code, can inhibit the out-of-band characteristic of a spread spectrum signal through the shaping filtering processing of the spread spectrum code, and has high flexibility.
2. Compared with the spread spectrum de-spreading technology based on the surface acoustic wave correlator, the invention can not cause the insertion loss of the radio frequency link. The acoustic surface wave correlator has larger insertion loss to a radio frequency link due to the limitation of the physical characteristics of a substrate, and the system performance is influenced; the scheme of the invention realizes spread spectrum and de-spread by using the drain modulation effect of the low-noise amplifier, has no insertion loss and can provide certain power gain for a radio frequency link.
3. Compared with the spread spectrum de-spreading technology based on the surface acoustic wave correlator, the method is applicable to higher working frequency. At present, due to the limitation of physical characteristics of devices, an acoustic surface wave correlator has low working frequency and limited application range; the microwave device used by the scheme of the invention has no special frequency limit and can meet the application requirements of dozens of megahertz to hundreds of gigahertz.
Drawings
Fig. 1 is a structural diagram of an implementation of a radio frequency front end spread spectrum processing method based on a drain modulation effect of a power amplifier;
FIG. 2 is a block diagram of an implementation of a RF front-end despreading method based on the drain modulation effect of a low noise amplifier;
fig. 3 is a time-domain square waveform diagram of the power supply signals output by the power supply modulator 1 and the power supply modulator 2;
FIG. 4 is a graph of the frequency spectra of the input RF signal and the output RF domain spread spectrum signal (square wave spreading codes) of the present processing method;
fig. 5 is a time domain waveform diagram after shaping and filtering of the power supply signals output by the power supply modulator 1 and the power supply modulator 2;
fig. 6 is a frequency spectrum diagram (shaped spreading code) of the input rf signal and the output rf domain spread spectrum signal according to the processing method;
FIG. 7 is a graph of the spectrum of the synthesizer output RF despread signal;
fig. 8 is a graph of the spectrum of the filtered radio frequency domain despread signal.
Detailed Description
The technical scheme of the invention is further elaborated in the following by combining the drawings in the specification.
Example 1
Referring to fig. 1-8 of the specification, this embodiment discloses:
a radio frequency front end spread spectrum and de-spread spectrum processing method based on the modulation effect of an amplifier drain electrode is characterized in that: the method comprises a radio frequency front end spread spectrum processing method and a radio frequency front end de-spread spectrum processing method;
the radio frequency front end spread spectrum processing method specifically comprises the following steps: the input radio frequency signal is input into a power divider, the power divider divides the input radio frequency signal into equal power, and one path of signal after equal power division is subjected to 180-degree phase shift processing through a phase shifter to generate two paths of radio frequency signals; the two branch radio-frequency signals are respectively sent into a power amplifier 1 and a power amplifier 2, the power amplifier 1 and the power amplifier 2 respectively utilize the drain electrode modulation effect of the power amplifier to realize the multiplication of the radio-frequency signals of each branch and the drain electrode power supply signals of the power amplifier corresponding to the radio-frequency signals of the branch, complete the direct sequence spread spectrum processing and provide power gain for the signals after the spread spectrum; the power amplifier 1 and the power amplifier 2 input the output signals into a synthesizer, the synthesizer performs power synthesis on the signals output by the power amplifier 1 and the power amplifier 2, eliminates carrier leakage, and finally outputs a radio frequency domain spread spectrum signal;
the radio frequency front end de-spreading processing method specifically comprises the following steps: inputting a radio frequency spread spectrum signal to be despread into a power divider, dividing the input radio frequency spread spectrum signal by the power divider in an equal power way, and performing 180-degree phase shift processing on one path of signal after equal power division by a phase shifter to generate two paths of radio frequency spread spectrum signals; in the two branches of radio frequency spread spectrum signals, the low noise amplifier 1 and the low noise amplifier 2 respectively realize the multiplication of the radio frequency spread spectrum signals of each branch and the drain power supply signal of the low noise amplifier corresponding to the branch by using the drain modulation effect of the low noise amplifier, so as to complete the de-spreading processing, and simultaneously perform power gain on the de-spread signals; the low noise amplifier 1 and the low noise amplifier 2 input the output despread signals into a synthesizer, the synthesizer performs power synthesis on the two branch despread signals, the synthesized signal is input into a filter, and the filter performs filtering processing on the synthesized despread signal to complete despreading in the radio frequency domain.
Example 2
As another preferred embodiment of the present application, referring to fig. 1-8 of the specification, the present embodiment discloses:
a radio frequency front end spread spectrum and de-spread spectrum processing method based on the modulation effect of an amplifier drain electrode is characterized in that: the method comprises a radio frequency front end spread spectrum processing method and a radio frequency front end de-spread spectrum processing method;
the radio frequency front end spread spectrum processing method specifically comprises the following steps: the input radio frequency signal is input into a power divider, the power divider divides the input radio frequency signal into equal power, and one path of signal after equal power division is subjected to 180-degree phase shift processing through a phase shifter to generate two paths of radio frequency signals; the two branch radio-frequency signals are respectively sent into a power amplifier 1 and a power amplifier 2, the power amplifier 1 and the power amplifier 2 respectively utilize the drain electrode modulation effect of the power amplifier to realize the multiplication of the radio-frequency signals of each branch and the drain electrode power supply signals of the power amplifier corresponding to the radio-frequency signals of the branch, complete the direct sequence spread spectrum processing and provide power gain for the signals after the spread spectrum; the power amplifier 1 and the power amplifier 2 input the output signals into a synthesizer, the synthesizer performs power synthesis on the signals output by the power amplifier 1 and the power amplifier 2, eliminates carrier leakage, and finally outputs a radio frequency domain spread spectrum signal;
in the spread spectrum processing, the drain modulation effect of the power amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence spread spectrum are respectively generated for two branch radio frequency signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 respectively receive two paths of code type signals output by the PN code configurator, the power supply modulators correspond to the power amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 respectively complete power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the two branch power amplifiers is realized.
The radio frequency front end de-spreading processing method specifically comprises the following steps: inputting a radio frequency spread spectrum signal to be despread into a power divider, dividing the input radio frequency spread spectrum signal by the power divider in an equal power way, and performing 180-degree phase shift processing on one path of signal after equal power division by a phase shifter to generate two paths of radio frequency spread spectrum signals; in the two branches of radio frequency spread spectrum signals, the low noise amplifier 1 and the low noise amplifier 2 respectively realize the multiplication of the radio frequency spread spectrum signals of each branch and the drain power supply signal of the low noise amplifier corresponding to the branch by using the drain modulation effect of the low noise amplifier, so as to complete the de-spreading processing, and simultaneously perform power gain on the de-spread signals; the low noise amplifier 1 and the low noise amplifier 2 input the output despread signals into a synthesizer, the synthesizer performs power synthesis on the two branch despread signals, the synthesized signals are input into a filter, and the filter performs filtering processing on the synthesized despread signals to complete despreading of the radio frequency domain;
in the despreading process, the drain modulation effect of the low noise amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence despreading are respectively generated for two branch radio frequency spread spectrum signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 are used for receiving two paths of code type signals output by the PN code configurator respectively, the power supply modulators correspond to the low noise rate amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 are used for completing power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the low noise amplifiers of the two branches is realized.
Example 3
As another preferred embodiment of the present application, referring to fig. 1-8 of the specification, the present embodiment discloses:
a radio frequency front end spread spectrum and de-spread spectrum processing method based on the modulation effect of an amplifier drain electrode is characterized in that: the method comprises a radio frequency front end spread spectrum processing method and a radio frequency front end de-spread spectrum processing method;
the radio frequency front end spread spectrum processing method specifically comprises the following steps: the input radio frequency signal is input into a power divider, the power divider divides the input radio frequency signal into equal power, and one path of signal after equal power division is subjected to 180-degree phase shift processing through a phase shifter to generate two paths of radio frequency signals; the two branch radio-frequency signals are respectively sent into a power amplifier 1 and a power amplifier 2, the power amplifier 1 and the power amplifier 2 respectively utilize the drain electrode modulation effect of the power amplifier to realize the multiplication of the radio-frequency signals of each branch and the drain electrode power supply signals of the power amplifier corresponding to the radio-frequency signals of the branch, complete the direct sequence spread spectrum processing and provide power gain for the signals after the spread spectrum; the power amplifier 1 and the power amplifier 2 input the output signals into the synthesizer, and the synthesizer performs power synthesis on the signals output by the power amplifier 1 and the power amplifier 2, eliminates carrier leakage, and finally outputs a radio frequency domain spread spectrum signal.
In the spread spectrum processing, the drain modulation effect of the power amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence spread spectrum are respectively generated for two branch radio frequency signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 respectively receive two paths of code type signals output by the PN code configurator, the power supply modulators correspond to the power amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 respectively complete power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the two branch power amplifiers is realized.
The spread spectrum processing method is specifically expressed as follows: the input radio frequency signal being RFinEnvelope information carried by the carrier wave is a (t), and carrier frequency is omegacInitial phase of
Figure BDA0002063191090000081
The signal may be expressed as:
Figure BDA0002063191090000082
the signal is divided by equal power of the power divider, and after 180-degree phase shift is carried out on one path of signal, two branches of radio frequency signals are generated:
Figure BDA0002063191090000083
Figure BDA0002063191090000084
the two branches of radio frequency signals are respectively sent to the power amplifier 1 and the power amplifier 2, and based on the modulation effect of the drain of the power amplifier, the output signals of the two power amplifiers can be represented as follows:
Figure BDA0002063191090000085
Figure BDA0002063191090000086
after being synthesized by the synthesizer, the output signal is:
Figure BDA0002063191090000087
since PN1 and PN2 satisfy the constraint of PN1+ PN2 being 0, the output signal can be expressed as:
Figure BDA0002063191090000088
the output signal is in a direct sequence spread spectrum signal representation form, the carrier leakage component of a single branch is eliminated, and the spread spectrum function of a radio frequency domain is realized.
The radio frequency front end de-spreading processing method specifically comprises the following steps: inputting a radio frequency spread spectrum signal to be despread into a power divider, dividing the input radio frequency spread spectrum signal by the power divider in an equal power way, and performing 180-degree phase shift processing on one path of signal after equal power division by a phase shifter to generate two paths of radio frequency spread spectrum signals; in the two branches of radio frequency spread spectrum signals, the low noise amplifier 1 and the low noise amplifier 2 respectively realize the multiplication of the radio frequency spread spectrum signals of each branch and the drain power supply signal of the low noise amplifier corresponding to the branch by using the drain modulation effect of the low noise amplifier, so as to complete the de-spreading processing, and simultaneously perform power gain on the de-spread signals; the low noise amplifier 1 and the low noise amplifier 2 input the output despread signals into a synthesizer, the synthesizer performs power synthesis on the two branch despread signals, the synthesized signal is input into a filter, and the filter performs filtering processing on the synthesized despread signal to complete despreading in the radio frequency domain.
In the despreading process, the drain modulation effect of the low noise amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence despreading are respectively generated for two branch radio frequency spread spectrum signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 are used for receiving two paths of code type signals output by the PN code configurator respectively, the power supply modulators correspond to the low noise rate amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 are used for completing power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the low noise amplifiers of the two branches is realized.
The despreading processing method is specifically expressed as follows: input radio frequency spread spectrum signal is RFi'nThe signal may be expressed as:
Figure BDA0002063191090000091
the signal is divided by equal power of the power divider, and after 180-degree phase shift is carried out on one path of signal, two branches of radio frequency signals are generated:
Figure BDA0002063191090000092
Figure BDA0002063191090000093
the two branches of radio frequency signals are respectively sent to a low noise amplifier 1 and a low noise amplifier 2, and based on the modulation effect of the drain electrode of the low noise amplifier, the two branches of output signals can be expressed as follows:
Figure BDA0002063191090000094
Figure BDA0002063191090000095
after being synthesized by the synthesizer, the output signal is:
Figure BDA0002063191090000096
since PN1 and PN2 satisfy the constraint of PN1+ PN2 being 0, the output signal can be expressed as:
Figure BDA0002063191090000097
since PN2 is a pseudo-random balanced code, the structure realizes the despreading function of the radio frequency domain.
Example 4
As another preferred embodiment of the present application, referring to fig. 1-8 of the specification, the present embodiment discloses:
in order to verify the feasibility of the scheme provided by the application, the invention carries out simulation design verification, and partial test data are given.
According to the scheme, the power amplifier, the low-noise amplifier and the broadband power supply modulator circuit of a microwave S frequency band (carrier frequency of 3.5GHz) are designed, a wireless transceiving simulation system is built based on a simulation environment, links such as baseband data stream quadrature modulation, pseudo-random code generation, amplifier drain power supply modulation and power synthesis are completed by using an Envelope simulator (Envelope) and a Harmonic Balance simulator (Harmonic Balance) in a coordinated mode, and simulation related parameters and test results are as follows.
System simulation parameters: the system sampling rate: 96 MHz; original signal code rate: 0.1Msps (16QAM modulation); original signal code bandwidth: 0.125MHz (raised cosine molding, molding factor 0.25); PN code rate: 8 Msps; spread spectrum bandwidth: 16 MHz; spread spectrum gain: 21 dB; carrier frequency point: 3.5 GHz; amplifier bandwidth: 200 MHz; circuit port impedance: 50 ohms; microwave circuit board: RO4350B (ROGERS, dielectric constant 3.66).
And (3) system test results:
(1) radio frequency front end spread spectrum result
The power supply signals output by the power supply modulator 1 and the power supply modulator 2 can be represented as PN1+ Vdc and PN2+ Vdc, respectively, where PN1 and PN2 are balanced codes, Vdc is a direct current bias, and parameter values can be configured according to actual application environments. The time domain waveforms of the power supply signals output by the power supply modulator 1 and the power supply modulator 2 are shown in fig. 3.
The frequency spectrum diagrams of the system input radio frequency signal and the output radio frequency domain spread spectrum signal are shown in fig. 4. The center frequency of the input radio frequency signal is 3.5GHz, the bandwidth is 0.125MHz, and the power is 11.43 dBm. After power supply modulation is carried out on the power amplifier drain electrode, the bandwidth of a signal main lobe is 16MHz, the signal power in the main lobe is 22.75dBm, the frequency spectrum of an output radio frequency signal is expanded by 128 times, and the power gain is 11.32 dB.
The PN code configurator may perform a shaping filtering on the square wave spreading code, and fig. 5 shows a waveform of the power supply signal after the shaping filtering. In this case, the spectrum diagrams of the system input rf signal and the output rf domain spread spectrum signal are shown in fig. 6. The center frequency of the input radio frequency signal is 3.5GHz, the bandwidth is 0.125MHz, and the power is 11.43 dBm. After power supply modulation is carried out on the power amplifier drain electrode, the bandwidth of a signal main lobe is 16MHz, the signal power in the main lobe is 22.86dBm, the frequency spectrum of an output radio frequency signal is expanded by 128 times, the power gain is 11.43dB, frequency components outside the main lobe bandwidth are quickly attenuated, and the bandwidth of a transmission frequency spectrum can be effectively controlled.
(2) RF front end despreading results
Aiming at the radio frequency domain spread spectrum signal generated in the process, the radio frequency front end de-spreading method provided by the invention is adopted to carry out de-spreading test. Fig. 7 shows the spectrum of the rf domain despread signal output by the synthesizer, which obviously has recovered the original rf signal (bandwidth 0.125 MHz). Due to the influence of non-ideal factors such as delay alignment of spreading codes, non-linearity of amplifier drain modulation and the like, stray frequency components appear in the despread radio frequency spectrum. Test results show that the spurious suppression degree is larger than 40dBc, and normal demodulation can be realized. If further spur suppression is desired, out-of-band suppression can be achieved using a filter, the resulting spectrum being shown in fig. 8.
In summary, according to the rf front end spreading and despreading scheme provided by the present invention, the rf front end spreading and despreading function without insertion loss and capable of flexibly configuring spreading codes can be achieved.

Claims (3)

1. A radio frequency front end spread spectrum and de-spread spectrum processing method based on the modulation effect of an amplifier drain electrode is characterized in that: the method comprises a radio frequency front end spread spectrum processing method and a radio frequency front end de-spread spectrum processing method;
the radio frequency front end spread spectrum processing method specifically comprises the following steps: the input radio frequency signal is input into a power divider, the power divider divides the input radio frequency signal into equal power and generates two branches of radio frequency signals, one branch of radio frequency signal after equal power division is subjected to 180-degree phase shift processing through a phase shifter and then is respectively sent into a power amplifier 1 and a power amplifier 2 together with the other branch of radio frequency signal, the power amplifier 1 and the power amplifier 2 respectively realize multiplication of each branch of radio frequency signal and a power amplifier drain electrode power supply signal corresponding to the branch of radio frequency signal by utilizing a power amplifier drain electrode modulation effect, direct sequence spread spectrum processing is completed, and power gain is provided for the spread spectrum signal; the power amplifier 1 and the power amplifier 2 input the output signals into a synthesizer, the synthesizer performs power synthesis on the signals output by the power amplifier 1 and the power amplifier 2, eliminates carrier leakage, and finally outputs a radio frequency domain spread spectrum signal;
in the rf front-end spread spectrum processing, the drain modulation effect of the power amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence spread spectrum are respectively generated for two branch radio frequency signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 respectively receive two paths of code type signals output by the PN code configurator, the power supply modulators correspond to the power amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 respectively complete power supply modulation according to the code type signals received correspondingly, so that the power supply function of drain electrodes of the two branch power amplifiers is realized;
the radio frequency front end de-spreading processing method specifically comprises the following steps: inputting a radio frequency spread spectrum signal to be despread into a power divider, dividing the input radio frequency spread spectrum signal by the power divider in an equal power manner to generate two branches of radio frequency spread spectrum signals, performing 180-degree phase shift processing on one branch of the radio frequency spread spectrum signal after equal power division through a phase shifter, and then respectively sending the radio frequency spread spectrum signal and the other branch of the radio frequency spread spectrum signal into a low noise amplifier 1 and a low noise amplifier 2, wherein the low noise amplifier 1 and the low noise amplifier 2 respectively utilize a drain electrode modulation effect of the low noise amplifier to realize multiplication of the radio frequency spread spectrum signal of each branch and a drain electrode power supply signal of the low noise amplifier corresponding to the branch, so that despreading processing is completed, and meanwhile, power gain is performed on the despread signal; the low noise amplifier 1 and the low noise amplifier 2 input the output despread signals into a synthesizer, the synthesizer performs power synthesis on the two branch despread signals, the synthesized signals are input into a filter, and the filter performs filtering processing on the synthesized despread signals to complete despreading of the radio frequency domain; in the rf front end despreading process, the drain modulation effect of the low noise amplifier specifically refers to: pseudo-random codes PN1 and PN2 required by direct sequence despreading are respectively generated for two branch radio frequency spread spectrum signals through a PN code configurator, the PN1 and the PN2 are balanced codes, and the constraint condition that PN1+ PN2 is 0 is met; the power supply modulator 1 and the power supply modulator 2 are used for receiving two paths of code type signals output by the PN code configurator respectively, the power supply modulators correspond to the low noise rate amplifiers one by one, and the power supply modulator 1 and the power supply modulator 2 are used for completing power supply modulation according to the code type signals received correspondingly, so that the drain electrode power supply function of the low noise amplifiers of the two branches is realized.
2. The method as claimed in claim 1, wherein the rf front-end spread spectrum and despreading processing method based on the drain modulation effect of the amplifier comprises: the spread spectrum processing method is specifically expressed as follows: the input radio frequency signal being RFinEnvelope information carried by the carrier wave is a (t), and carrier frequency is omegacInitial phase of
Figure FDA0002888743870000021
The input radio frequency signal may be represented as:
Figure FDA0002888743870000022
the input radio frequency signal is divided by the power divider with equal power to generate two branches of radio frequency signals, and after one branch of radio frequency signal is phase-shifted by 180 degrees, the two branches of radio frequency signals are:
Figure FDA0002888743870000023
Figure FDA0002888743870000024
the two branches of radio frequency signals are respectively sent to the power amplifier 1 and the power amplifier 2, and based on the modulation effect of the drain of the power amplifier, the output signals of the two power amplifiers can be represented as follows:
Figure FDA0002888743870000025
Figure FDA0002888743870000026
after being synthesized by the synthesizer, the output signal is:
Figure FDA0002888743870000027
since PN1 and PN2 satisfy the constraint of PN1+ PN2 being 0, the output signal can be expressed as:
Figure FDA0002888743870000028
the output signal is in a direct sequence spread spectrum signal representation form, the carrier leakage component of a single branch is eliminated, and the spread spectrum function of a radio frequency domain is realized.
3. The method as claimed in claim 2, wherein the rf front-end spread spectrum and despreading processing method based on the drain modulation effect of the amplifier comprises: in the rf front-end spread spectrum processing, the despreading processing method is specifically expressed as: the input radio frequency spread spectrum signal is RF'inThe rf spread spectrum signal can be expressed as:
Figure FDA0002888743870000029
RF′inthe signal is divided by the power divider with equal power to generate two branches of radio frequency spread spectrum signals, and after 180-degree phase shift is carried out on one branch of radio frequency spread spectrum signal, the two branches of radio frequency spread spectrum signals are:
Figure FDA0002888743870000031
Figure FDA0002888743870000032
the two branches of radio frequency spread spectrum signals are respectively sent to a low noise amplifier 1 and a low noise amplifier 2, and based on the modulation effect of the drain electrode of the low noise amplifier, two paths of output signals can be expressed as follows:
Figure FDA0002888743870000033
Figure FDA0002888743870000034
after being synthesized by the synthesizer, the output signal is:
Figure FDA0002888743870000035
since PN1 and PN2 satisfy the constraint of PN1+ PN2 being 0, the output signal can be expressed as:
Figure FDA0002888743870000036
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