CN104954089B - A kind of frequency spectrum sensing method being compared based on multiple antennas instantaneous power - Google Patents
A kind of frequency spectrum sensing method being compared based on multiple antennas instantaneous power Download PDFInfo
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Abstract
The invention discloses a kind of frequency spectrum sensing method being compared based on multiple antennas instantaneous power, it utilizes many reception antennas to receive the continuous radiofrequency signal of time domain；Then to each time domain, continuous radiofrequency signal carries out down coversion, time-domain sampling obtains the baseband signal of corresponding time domain discrete；Then calculate the instantaneous power of the time domain sampling point in each time-domain sampling moment in the baseband signal of each time domain discrete, then by all instantaneous powers order from small to large to all instantaneous powers again assignment；Then calculate statistic of test；Finally by the size of comparison test statistic and decision threshold, determine whether there is other radio communication services and take frequency range, realize frequency spectrum perception；Advantage is that frequency spectrum perception is functional, and overcomes energy measuring method and require accurately to predict the defect of noise power, also overcomes the shortcoming that relativity of time domain between multiple antenna receiving signal for the eigenvalue detection method is relatively low or uncorrelated time-frequency spectrum perception was lost efficacy.
Description
Technical field
The present invention relates to the frequency spectrum perception technology in a kind of cognitive radio system, especially relate to one kind and be based on multiple antennas
The frequency spectrum sensing method that instantaneous power compares.
Background technology
With the rapid growth of radio communication service, people improve constantly to the demand of frequency spectrum resource, and frequency spectrum resource lacks
Weary phenomenon becomes increasingly severe.On the one hand, the fast-developing and various system of radio communication service, agreement, network be not
Disconnected occur, and makes more people need to use radio-frequency spectrum；On the other hand, many frequency ranges have been allocated to authorized user, non-
The frequency range that authorized user can only be not authorized to using those, the frequency range without being authorized to is very rare again, existing
The frequency spectrum resource utilization rate of fixing frequency spectrum resource allocation strategy is lowly to cause the one of the main reasons of this phenomenon.Cognitive nothing
Line electricity (Cognitive Radio, CR) technology can effectively improve frequency spectrum resource utilization rate, is to realize frequency spectrum resource dynamically distributes
One of major programme.Frequency spectrum perception is the important component part in cognitive radio technology, and it can effectively prevent using recognizing
Know that the radio communication service of radiotechnics produces interference to the other radio communication services in same frequency range, frequency spectrum perception
Performance is directly connected to the quality of radio communication service.
Existing frequency spectrum sensing method mainly has energy measuring method, cycle specificity detection method, covariance matrix detection method, spy
Value indicative detection method etc..In these methods, energy measuring method needs to know noise power, and cycle specificity detection method needs to know awards
The cycle frequency of power subscriber signal.When not knowing the cycle frequency of noise power and authorization user signal, energy measuring method and
The frequency spectrum perception performance of cycle specificity detection method can degradation.In the case of multiple antennas, covariance matrix detection method and spy
Value indicative detection method can realize frequency spectrum perception using the dependency between receipt signal, but in actual applications, in order to obtain
Diversity gain, the dependency between receipt signal is relatively low or even uncorrelated, and now the frequency spectrum perception performance of both approaches is relatively
Difference.
Content of the invention
The technical problem to be solved is to provide a kind of frequency spectrum perception side comparing based on multiple antennas instantaneous power
Method, its frequency spectrum perception is functional.
The present invention solves the technical scheme that adopted of above-mentioned technical problem：A kind of compared based on multiple antennas instantaneous power
Frequency spectrum sensing method is it is characterised in that comprise the following steps：
1. assume in cognitive radio system, have M root reception antenna to be used to receive the continuous radiofrequency signal of time domain, wherein,
M represents the sum of the reception antenna in cognitive radio system, M >=2；
2. the continuous radiofrequency signal of time domain every reception antenna being received carries out down-converted, obtains every reception
The continuous baseband signal of the corresponding time domain of the continuous radiofrequency signal of time domain that antenna receives；Then every reception antenna is received
To the continuous baseband signal of the corresponding time domain of the continuous radiofrequency signal of time domain carry out time-domain sampling process, obtain every reception sky
The baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that line receives, i-th reception antenna is received
The time domain sampling point in n-th time-domain sampling moment in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain
Sampled value is designated as xi,n, wherein, i=1,2 ..., M, n=1,2 ..., N, N represent the sampling number that time-domain sampling is processed, N >=15；
3. calculate the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that every reception antenna receives
In the time domain sampling point in each time-domain sampling moment instantaneous power, the time domain that i-th reception antenna is received is continuous
The instantaneous power note of the time domain sampling point in n-th time-domain sampling moment in the baseband signal of the corresponding time domain discrete of radiofrequency signal
For ri,n, ri,n=(| xi,n|)2, wherein, symbol " | | " it is the symbol that takes absolute value；
Then in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain M root reception antenna being received
The instantaneous power of the time domain sampling point in all time-domain sampling moment be ranked up by order from small to large, then numerical value 1 is arrived M
The common M of × N × N number of positive integer corresponds the M × N number of instantaneous power after being assigned to by order sequence from small to large, by i-th
During n-th time-domain sampling in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that reception antenna receives
Again the value after assignment is designated as r to the instantaneous power of the time domain sampling point carvedi,n'；
4. calculate statistic of test, be designated as T,
5. according to false-alarm probability PfWith the sum M of the reception antenna in cognitive radio system, calculate decision threshold, be designated as
The value of λ, λ is the upper P of the chi square distribution that degree of freedom is M-1fThe value of quantile, wherein, 0≤Pf≤1；
6. comparison test statistic T and the size of decision threshold λ, if T >=λ, judge that other wireless communications industry are done honest work
Take frequency range；If T<λ, then judge other vacant frequency ranges of radio communication service.
Compared with prior art, it is an advantage of the current invention that：
1) the inventive method calculate decision threshold when merely with the antenna in false-alarm probability and cognitive radio system
Sum it is not necessary to know noise power, therefore the inventive method effectively overcomes existing energy measuring method and needs to know
The defect of noise power.
Then pair 2) the inventive method first carries out down-converted and obtains the continuous baseband signal of time domain to receipt signal, when
The continuous baseband signal in domain carries out the baseband signal that time-domain sampling obtains time domain discrete, then calculates in the baseband signal of time domain discrete
Each time domain sampling point instantaneous power, and assignment again after all instantaneous powers are sorted from small to large, finally according to weight
Instantaneous power value after new assignment calculates statistic of test, and this makes dependency between receipt signal for the inventive method relatively low
Or still there is when uncorrelated preferable frequency spectrum perception performance, therefore the inventive method effectively overcomes existing eigenvalue inspection
The shortcoming that dependency between receipt signal for the survey method is relatively low or the perception of uncorrelated time-frequency spectrum is poor.
Brief description
Fig. 1 totally realizes block diagram for the inventive method；
Fig. 2 is the frequency spectrum perception Performance comparision schematic diagram of the inventive method and energy measuring method and eigenvalue detection method.
Specific embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
A kind of frequency spectrum sensing method being compared based on multiple antennas instantaneous power proposed by the present invention, it totally realizes block diagram such as
Shown in Fig. 1, it comprises the following steps：
1. assume in cognitive radio system, have M root reception antenna to be used to receive the continuous radiofrequency signal of time domain, wherein,
M represents the sum of the reception antenna in cognitive radio system, M >=2.
X in Fig. 11T () represents the 1st continuous radiofrequency signal of the time domain that reception antenna receives, x2T () represents the 2nd and connects
Receive the continuous radiofrequency signal of time domain that antenna receives, xMT () represents the continuous radio frequency of time domain that M root reception antenna receives
Signal.
2. entered using the continuous radiofrequency signal of time domain that existing down-converted technology receives to every reception antenna
Row down-converted, obtains the corresponding time domain of the continuous radiofrequency signal of the time domain continuous base band letter that every reception antenna receives
Number；Then corresponded to using the continuous radiofrequency signal of time domain that existing time-domain sampling treatment technology receives to every reception antenna
The continuous baseband signal of time domain carry out time-domain sampling process, obtain the time domain continuous radio frequency letter that every reception antenna receives
The baseband signal of number corresponding time domain discrete, when the continuous radiofrequency signal of time domain that i-th reception antenna is received is corresponding
The sampled value of the time domain sampling point in n-th time-domain sampling moment in the discrete baseband signal in domain is designated as xi,n, wherein, i=1,
2 ..., M, n=1,2 ..., N, N represent the sampling number that time-domain sampling is processed, N >=15.
Here, the sampling period can be at equal intervals it is also possible to unequal interval when time-domain sampling is processed.
3. calculate the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that every reception antenna receives
In the time domain sampling point in each time-domain sampling moment instantaneous power, the time domain that i-th reception antenna is received is continuous
The instantaneous power note of the time domain sampling point in n-th time-domain sampling moment in the baseband signal of the corresponding time domain discrete of radiofrequency signal
For ri,n, ri,n=(| xi,n|)2, wherein, symbol " | | " it is the symbol that takes absolute value；
Then in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain M root reception antenna being received
The instantaneous power of the time domain sampling point in all time-domain sampling moment be ranked up by order from small to large, then numerical value 1 is arrived M
The common M of × N × N number of positive integer corresponds the M × N number of instantaneous power after being assigned to by order sequence from small to large, by i-th
During n-th time-domain sampling in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that reception antenna receives
Again the value after assignment is designated as r to the instantaneous power of the time domain sampling point carvedi,n'.
4. calculate statistic of test, be designated as T,
5. according to false-alarm probability PfWith the sum M of the reception antenna in cognitive radio system, calculate decision threshold, be designated as
The value of λ, λ is the upper P of the chi square distribution that degree of freedom is M-1fThe value of quantile, wherein, 0≤Pf≤1.
6. comparison test statistic T and the size of decision threshold λ, if T >=λ, judge that other wireless communications industry are done honest work
Take frequency range；If T<λ, then judge other vacant frequency ranges of radio communication service.
Below by way of Computer Simulation, further illustrate feasibility and the effectiveness of the frequency spectrum sensing method of the present invention.
Assume to have M=4 root reception antenna in cognitive radio system, the sampling number that time-domain sampling is processed is N=100,
And assume that the channel on reception antenna is separate, and obey Nakagami distribution, signal to noise ratio is set to -10dB.Fig. 2 gives this
The frequency spectrum perception performance ratio that the detection probability of inventive method and energy measuring method and eigenvalue detection method changes with false-alarm probability
Relatively, wherein energy measuring method does not know noise power, but knows two upper limits of noise power, and two upper limits are corresponding makes an uproar for this
Sound uncertainty is respectively 0.1dB and 0.2dB.From figure 2 it can be seen that when false-alarm probability be 0.1, noise uncertainty from
When 0.1dB increases to 0.2dB, the detection probability of energy measuring method drops to 0.40 from 0.58, and the inventive method is not being known
Remain able to reach 0.73 detection probability in the case of the upper limit of noise power and noise power；In addition, when false-alarm probability is
When 0.1, the detection probability of the inventive method can reach 0.73, and the detection probability of eigenvalue detection method can only achieve 0.28.
Claims (1)
1. a kind of frequency spectrum sensing method being compared based on multiple antennas instantaneous power is it is characterised in that comprise the following steps：
1. M root reception antenna is had to be used to receive the continuous radiofrequency signal of time domain in cognitive radio system, wherein, M represents and recognizes
Know the sum of the reception antenna in radio system, M >=2；
2. the continuous radiofrequency signal of time domain every reception antenna being received carries out down-converted, obtains every reception antenna
The continuous baseband signal of the corresponding time domain of the continuous radiofrequency signal of time domain receiving；Then every reception antenna is received
The continuous baseband signal of the corresponding time domain of the continuous radiofrequency signal of time domain carries out time-domain sampling process, obtains every reception antenna and connects
The baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain receiving, the time domain that i-th reception antenna is received
The sampling of the time domain sampling point in n-th time-domain sampling moment in the baseband signal of the continuous corresponding time domain discrete of radiofrequency signal
Value is designated as xi,n, wherein, i=1,2 ..., M, n=1,2 ..., N, N represent the sampling number that time-domain sampling is processed, N >=15；
3. calculate in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that every reception antenna receives
The instantaneous power of the time domain sampling point in each time-domain sampling moment, the continuous radio frequency of time domain that i-th reception antenna is received
The instantaneous power of the time domain sampling point in n-th time-domain sampling moment in the baseband signal of the corresponding time domain discrete of signal is designated as
ri,n, ri,n=(| xi,n|)2, wherein, symbol " | | " it is the symbol that takes absolute value；
Then the institute in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain M root reception antenna being received
The instantaneous power having the time domain sampling point of time domain sampling instant is ranked up by order from small to large, then numerical value 1 is arrived M × N
Common M × N number of positive integer corresponds the M × N number of instantaneous power after being assigned to by order sequence from small to large, and i-th is connect
Receive n-th time-domain sampling moment in the baseband signal of the corresponding time domain discrete of the continuous radiofrequency signal of time domain that antenna receives
The instantaneous power of time domain sampling point the value after assignment is designated as r againi,n'；
4. calculate statistic of test, be designated as T,
5. according to false-alarm probability PfWith the sum M of the reception antenna in cognitive radio system, calculate decision threshold, be designated as λ, λ's
Value is the upper P of the chi square distribution that degree of freedom is M-1fThe value of quantile, wherein, 0≤Pf≤1；
6. the size of comparison test statistic T and decision threshold λ, if T >=λ, judges that other wireless communications industry are done honest work occupancy
Frequency range；If T<λ, then judge other vacant frequency ranges of radio communication service.
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| CN102013928A (en) * | 2010-11-22 | 2011-04-13 | 宁波大学 | Fast spectrum perception method in cognitive radio system |
| CN102324959A (en) * | 2011-06-10 | 2012-01-18 | 宁波大学 | Frequency spectrum sensing method based on multi-aerial system covariance matrix |
| US8160163B1 (en) * | 2007-08-06 | 2012-04-17 | University Of South Florida | Method for OFDM signal identification and parameter estimation |
| CN102710345A (en) * | 2012-04-27 | 2012-10-03 | 宁波大学 | Cognition radio frequency spectrum sensing method based on multi-antenna Friedman inspection |
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| US8160163B1 (en) * | 2007-08-06 | 2012-04-17 | University Of South Florida | Method for OFDM signal identification and parameter estimation |
| CN102013928A (en) * | 2010-11-22 | 2011-04-13 | 宁波大学 | Fast spectrum perception method in cognitive radio system |
| CN102324959A (en) * | 2011-06-10 | 2012-01-18 | 宁波大学 | Frequency spectrum sensing method based on multi-aerial system covariance matrix |
| CN102710345A (en) * | 2012-04-27 | 2012-10-03 | 宁波大学 | Cognition radio frequency spectrum sensing method based on multi-antenna Friedman inspection |
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