CN110138474A - A kind of zoom-type panorama microwave spectrum monitoring method - Google Patents
A kind of zoom-type panorama microwave spectrum monitoring method Download PDFInfo
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- CN110138474A CN110138474A CN201910312696.4A CN201910312696A CN110138474A CN 110138474 A CN110138474 A CN 110138474A CN 201910312696 A CN201910312696 A CN 201910312696A CN 110138474 A CN110138474 A CN 110138474A
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
Abstract
The invention discloses a kind of zoom-type panorama microwave spectrum monitoring methods, belong to frequency microwave field of communication technology, are a kind of zoom-type full frequency band microwave spectrum monitoring systems.The signal distributions on entire frequency spectrum are perceived using MWC compressed sensing receiver, adaptive local oscillator is reused to realize that zoom-type is observed, realize frequency focusing ability heterogeneous, reduce the local oscillation signal power of no signal frequency range, enhance interest frequency range conversion gain, so as to improve receiver sensitivity, inhibit interference signal to the pressure of receiver rear end.Local oscillation signal Fourier coefficient is measured using the integrated online method of testing of low cost, in addition signal recovery algorithms, realize the signaling protein14-3-3 to selected frequency range.
Description
Technical field
The invention belongs to frequency microwave fields of communication technology, are a kind of zoom-type full frequency band microwave spectrum monitoring systems.
Background technique
DC-6GHz frequency spectrum resource is depleted, and the communication systems such as 5G and 5G beyond are inevitable to be migrated toward millimeter wave frequency band.
The multiple systems such as communication, radar, navigation can make radio environment become incomparable complexity, to the specification of millimeter wave frequency spectrum resource,
The demands such as monitoring, the positioning of interference signal are gradually brought into schedule.Since traditional receivers are the mode of narrow-band receiver,
It at full wave scanning, needs to consume the plenty of time, serious challenge is brought to the capture of real-time dynamic spectrum, detection and tracking.Such as
Fruit uses the broadband receiver mode of microwave signal Direct Digital sampling, then needs the ADC device using high sample rate, a side
Face is with high costs and in embargo inventory, is also required to wait the time-domain sampling of long period to meet frequency spectrum point even if can be realized
The technical requirements of resolution.Compressed sensing receiver is then a kind of a kind of preferable half-way house occurred in recent years, is sacrificing natural
In the case where sensitivity, the rate requirement of ADC device can be effectively reduced using the program, and meet ultra wide band real-time reception
Demand.But millimetre-wave attenuator frequency range can extend near 60GHz, and single carrier frequency bandwidth can be more than 1GHz, this is right
The realization of classical compressed sensing receiver is still severe challenge.Because classical architecture remains that signal meets sparsity
It is required that while processing effective signal bandwidth it is limited, such as 200MHz total bandwidth.And the signal of classical compressed sensing receiver
Sensitivity declines to a great extent compared with narrow-band receiver, and fall is consistent in full frequency band.Such as DC-3GHz compression
The signal sensitivity theoretical limit of receiver is perceived in -75dBm or so, the detection and demodulation of this meeting extreme influence small-signal.
In the case where the technical characteristic of millimetre-wave attenuator requires, it had not only been able to achieve ultrabroad-band spectrum monitoring, but also has been able to achieve big bandwidth signal demodulation and connects
The ability of receipts will be the important symbol for breaking through current microwave spectrum monitoring problem.
MWC (Modulated Wideband Converter) compressed sensing receiver is a kind of Asia proposed in 2010
Nyquist sampling receiver can apply to multi-band signal.MWC receiver utilizes pseudo-random period sequence in system front end
Spectral aliasing is carried out to input signal, the high-frequency information of signal is moved at baseband frequency, then mixed frequency signal is carried out low
Pass filter and sampling.Due to using multiple sampling channels, each sampling channel carries out different mixing, therefore energy to signal
Relatively sparse signal is recovered from more mixed frequency signal sampled value in Digital Signal Processing below.
The substantially homogeneous mixing tremendously low frequency of all signals that classical MWC compressed sensing receiver can will receive frequency range, and
Linear superposition is carried out, carries out signals revivification finally by signal recovery algorithms.Its local oscillation signal used is random sequence, from system
It sees that power level of the local oscillation signal on each discrete frequency point should be relatively uniform on meter, all signals in entire frequency range can be perceived
Distribution, be conducive to all frequency band signals it is uniform reception and processing.But uniform received scheme is unfavorable for improving receiver
Sensitivity, and the random local oscillator of high speed realizes difficulty, and millimeter wave frequency band signal conversion gain is lower, and signal sensitivity is very poor,
It is larger by noise and interference effect.
Summary of the invention
The invention proposes the fast frequency spectrum prisons in a kind of DC-60GHz frequency range based on MWC compressed sensing receiver
Examining system can perceive the spectrum distribution of each signal in this frequency range and carry out zoom-type observation.
A kind of zoom-type panorama microwave spectrum monitoring method of the present invention, this method comprises:
Step 1: acquisition signal x (t) is inputted into m channel simultaneously, and with the local oscillator p in every channeli(t) it is mutually mixed,
The local oscillation signal p in each channeli(t) pseudo-random sequence signal different for period identical time domain waveform；
Step 2: the signal after being mixed in each channel of step 1 being entered into low-pass filter, then to by low-pass filtering
Signal is sampled, and digital signal y is obtainedi[n]；
Step 3: carrying out Digital Signal Processing according to digital signal is obtained, complete frequency spectrum perception, obtain desired signal place
Frequency range；
Step 4 is according to the spectrum distribution of current demand signal, by the local oscillation signal p in former each channeli(t) adaptive sheet is replaced with
Vibration；The generation method of the adaptive local oscillator are as follows:
Method one: establishing adaptive local oscillator library in advance, which includes multiple and different local oscillation signals, each
The local oscillation signal of group has apparent selecting frequency characteristic, and the interest frequency range of each group local oscillation signal frequency-selecting is different, according to step 3 frequency spectrum
Frequency range where the desired signal perceived selects corresponding one group of local oscillation signal to carry out in all channels with acquisition signal x (t)
Mixing, with traditional MWC compressed sensing reception；
Method two: frequency range where the desired signal arrived according to step 3 frequency spectrum perception, using multiple phaselocked loops in corresponding frequency band
Multiple tone signals are generated, multiple tone signals of generation are mixed, mixed single-tone is believed according to the power of acquisition signal
Number carry out algorithm for power modulation, generate one group of local oscillation signal, using this group of local oscillation signal in all channels with acquisition signal x (t) into
Row mixing；
Method three: using the direct in-time generatin of FPGA, frequency range where the desired signal arrived by step 3 frequency spectrum perception, really
Surely it is suitble to the local oscillation signal spectrum signature of current demand signal, the form of the anti-time domain for releasing required local oscillation signal is generated most by FPGA
Close to time domain form sequence group as local oscillation signal, this group of local oscillation signal is carried out in all channels with acquisition signal x (t)
Mixing；
Step 5: the signal after being mixed in m channel of step respectively being entered into low-pass filter, then to by low pass filtered
The signal of wave is sampled, and desired signal digital signal is obtained；Biography digital signal is carried out to the desired signal digital signal of acquisition
Processing is completed signal and is restored.
Present invention improves over MWC compressed sensing receiver, solves its intrinsic disadvantage and remain it to frequency spectrum
Sensing capability can be transitioned into any band limits interested, in any frequency range model interested for being no more than specification limit from panorama
Enclosing can provide real-time microwave signal monitoring capability, and as the bandwidth for capturing frequency range simultaneously reduces, signal sensitivity can be adaptive
Optimize (zoom capabilities).
The technical scheme is that perceiving the signal distributions on entire frequency spectrum using MWC compressed sensing receiver, then make
It realizes that zoom-type is observed with adaptive local oscillator, realizes frequency focusing ability heterogeneous, reduce the local oscillator of no signal frequency range
Signal power enhances interest frequency range conversion gain, so as to improve receiver sensitivity, inhibits interference signal to receiver rear end
Pressure.Local oscillation signal Fourier coefficient is measured using the integrated online method of testing of low cost, in addition signal recovery algorithms, are realized
To the signaling protein14-3-3 of selected frequency range.
Detailed description of the invention
Fig. 1 is the workflow of system；
Fig. 2 is the various signals being distributed on entire frequency spectrum；
Fig. 3 is the working principle of MWC compressed sensing receiver；
Fig. 4 is adaptive local oscillator generator
Fig. 5 is pseudorandom local oscillation signal frequency spectrum；
Fig. 6 is the signal spectrum at MWC compressed sensing receiver intermediate frequency；
Fig. 7 is adaptive local oscillator frequency spectrum；
Fig. 8 is the signal spectrum at receiver intermediate frequency of the invention.
Specific embodiment
Present invention combination attached drawing, to illustrate the working principle of entire zoom-type frequency spectrum monitoring system, the work of whole system
Process is as shown in Figure 1.
The multiband radio frequency signal of system input is dispersed with various signals on entire frequency spectrum, it is assumed that multiband radio frequency signal
It is as shown in Figure 2 that x (t) is dispersed with 3 different signal A, B, C on frequency domain.The first step of spectrum monitoring is exactly the entire frequency of perception
Spectrum, the perception of the complete paired spectrum of MWC receiver energy.
The working principle of MWC receiver is as shown in Figure 3.X (t) enters m channel simultaneously, and respectively with each channel
Local oscillator pi(t) it is mutually mixed, the local oscillation signal p in each channeli(t) be same period pseudo-random sequence signal, but each local oscillator
Time domain waveform be different from.Signal after mixing enters low-pass filter, is then sampled into digital signal y by ADCi[n].By
It is pseudorandom sequence in its local oscillator, the different equally spaced multitone forms of amplitude is expressed as on frequency domain, as shown in Figure 5.x(t)
After mixing, due to characteristic of the local oscillation signal on frequency domain, the signal A, B, C of distribution on different frequency bands are removed in x (t)
It adjourns intermediate frequency and has carried out linear aliasing, the intermediate-freuqncy signal frequency spectrum after aliasing is as shown in Figure 6.For passing through different local oscillator pi(t)
The intermediate-freuqncy signal of the x (t) of mixing, output are also different.Due to output signal yi[n] contains all frequencies of input signal
The linear superposition of spectral component can complete the frequency spectrum perception to all signals later by Digital Signal Processing, realize to frequency
The positioning of signal on domain.
In order to realize the observation of zoom-type, complete using after MWC compressed sensing receiver perceived spectral, original puppet with
Machine sequence local oscillator will be no longer used, then use adaptive local oscillator, this is also emphasis of the invention.Because signal is in frequency domain
On distributed intelligence perception stage in front acquired in, realize the sight to the signal of different frequency range by adjusting local oscillator
Survey becomes possible.The local oscillator of use is generated by adaptive local oscillator generator, such as Fig. 4.Original is different from its frequency domain of adaptive local oscillator
The pseudorandom local oscillator come, does not need for all signals to be all mixed, it is only necessary to our interested signals can be mixed to
Intermediate frequency is just.For example we think reception signal A, B and lose interest in C, then the frequency domain of adaptive local oscillator can be such as Fig. 7 institute
Show.It is as shown in Figure 8 using the intermediate frequency spectrum after this adaptive local oscillator.By adjusting adaptive local oscillator, we can will be located at not
Intermediate frequency is moved with the radiofrequency signal in frequency range, can also be avoided as far as possible during the signal in other frequency ranges is shifted at the same time
Frequently.It can increase interest frequency range conversion gain, so as to improve receiver sensitivity, inhibit interference signal to the pressure of receiver rear end
Power realizes the focusing to observing frequency.
The accurate test of local oscillation signal Fourier coefficient is to realize the key technology of signals revivification, when adaptive local oscillator is controlled
When change, the workload for testing Fourier coefficient in advance is huge, and is affected by circuit non-ideal factor, and the present invention is using low
The integrated online testing scheme of cost, is conducive to the realization of adaptive spectrum control program.It is received again with classical compressed sensing
Signal monitoring and recovery algorithms in machine complete the recovery to useful signal.
Claims (3)
1. a kind of zoom-type panorama microwave spectrum monitoring method, this method comprises:
Step 1: acquisition signal x (t) is inputted into m channel simultaneously, and with the local oscillator p in every channeli(t) it is mutually mixed, Mei Getong
The local oscillation signal p in roadi(t) pseudo-random sequence signal different for period identical time domain waveform；
Step 2: the signal after being mixed in each channel of step 1 being entered into low-pass filter, then to the signal Jing Guo low-pass filtering
It is sampled, obtains digital signal yi[n]；
Step 3: carrying out Digital Signal Processing according to digital signal is obtained, complete frequency spectrum perception, obtain the frequency where desired signal
Section；
Step 4 is according to the spectrum distribution of current demand signal, by the local oscillation signal p in former each channeli(t) adaptive local oscillator is replaced with；Institute
State the generation method of adaptive local oscillator are as follows:
Adaptive local oscillator library is established in advance, which includes multiple and different local oscillation signals, each group of local oscillator letter
Number there is apparent selecting frequency characteristic, and the interest frequency range of each group local oscillation signal frequency-selecting is different, the phase arrived according to step 3 frequency spectrum perception
Frequency range where hoping signal selects corresponding one group of local oscillation signal to be mixed in all channels with acquisition signal x (t), with biography
The MWC compressed sensing of system receives the same；
Step 5: the signal after being mixed in m channel of step respectively being entered into low-pass filter, then to by low-pass filtering
Signal is sampled, and desired signal digital signal is obtained；Biography Digital Signal Processing is carried out to the desired signal digital signal of acquisition,
Signal is completed to restore.
2. a kind of zoom-type panorama microwave spectrum monitoring method, this method comprises:
Step 1: acquisition signal x (t) is inputted into m channel simultaneously, and with the local oscillator p in every channeli(t) it is mutually mixed, Mei Getong
The local oscillation signal p in roadi(t) pseudo-random sequence signal different for period identical time domain waveform；
Step 2: the signal after being mixed in each channel of step 1 being entered into low-pass filter, then to the signal Jing Guo low-pass filtering
It is sampled, obtains digital signal yi[n]；
Step 3: carrying out Digital Signal Processing according to digital signal is obtained, complete frequency spectrum perception, obtain the frequency where desired signal
Section；
Step 4 is according to the spectrum distribution of current demand signal, by the local oscillation signal p in former each channeli(t) adaptive local oscillator is replaced with；Institute
State the generation method of adaptive local oscillator are as follows:
Frequency range where the desired signal arrived according to step 3 frequency spectrum perception generates multiple lists in corresponding frequency band using multiple phaselocked loops
Sound signal mixes multiple tone signals of generation, carries out power to mixed tone signal according to the power of acquisition signal
Modulation generates one group of local oscillation signal, is mixed in all channels with acquisition signal x (t) using this group of local oscillation signal；
Step 5: the signal after being mixed in m channel of step respectively being entered into low-pass filter, then to by low-pass filtering
Signal is sampled, and desired signal digital signal is obtained；Biography Digital Signal Processing is carried out to the desired signal digital signal of acquisition,
Signal is completed to restore.
3. a kind of zoom-type panorama microwave spectrum monitoring method, this method comprises:
Step 1: acquisition signal x (t) is inputted into m channel simultaneously, and with the local oscillator p in every channeli(t) it is mutually mixed, Mei Getong
The local oscillation signal p in roadi(t) pseudo-random sequence signal different for period identical time domain waveform；
Step 2: the signal after being mixed in each channel of step 1 being entered into low-pass filter, then to the signal Jing Guo low-pass filtering
It is sampled, obtains digital signal yi[n]；
Step 3: carrying out Digital Signal Processing according to digital signal is obtained, complete frequency spectrum perception, obtain the frequency where desired signal
Section；
Step 4 is according to the spectrum distribution of current demand signal, by the local oscillation signal p in former each channeli(t) adaptive local oscillator is replaced with；Institute
State the generation method of adaptive local oscillator are as follows:
Using the direct in-time generatin of FPGA, frequency range where the desired signal arrived by step 3 frequency spectrum perception determines and is suitble to current letter
Number local oscillation signal spectrum signature, it is anti-release needed for local oscillation signal time domain form, generated by FPGA closest to time domain form
Sequence group as local oscillation signal, this group of local oscillation signal is mixed in all channels with acquisition signal x (t)；
Step 5: the signal after being mixed in m channel of step respectively being entered into low-pass filter, then to by low-pass filtering
Signal is sampled, and desired signal digital signal is obtained；Biography Digital Signal Processing is carried out to the desired signal digital signal of acquisition,
Signal is completed to restore.
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