CN107769873A - A kind of flexible digital band limited white noise production method - Google Patents
A kind of flexible digital band limited white noise production method Download PDFInfo
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- CN107769873A CN107769873A CN201710888137.9A CN201710888137A CN107769873A CN 107769873 A CN107769873 A CN 107769873A CN 201710888137 A CN201710888137 A CN 201710888137A CN 107769873 A CN107769873 A CN 107769873A
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Abstract
The invention discloses a kind of flexible digital band limited white noise production method, relate generally to digital band limited white noise and produce.It to original digital white noise production method by carrying out further applicability transformation, structure is realized using new, it can export the different number tape of multiple position differences, adaptive-bandwidth, power simultaneously by parameter configuration on the premise of keeping design architecture constant and limit white noise signal.The present invention has the advantages that adjustable output signal quantity, signal bandwidth flexibility and changeability, supports signal power to be separately provided, suitable for some occasions for needing multiple different bandwidth diverse location different capacity numeral white noise signals.
Description
Technical field
The present invention relates to a kind of flexible digital band limited white noise production method, suitable for Radar Signal Processing, communication system
The fields such as unified test examination, remote-control romote-sensing and channel simulation.
Background technology
In the prevalence of white noise in whole cosmic space, in order to press close to true environment, in Radar Signal Processing, communication system
The fields such as unified test examination, remote-control romote-sensing and channel simulation are, it is necessary to artificial addition numeral white noise signal.But current most of white noise
Sound production method can only export the digital white noise signal of a fixed-bandwidth, using being relatively fixed, for it is some need it is multiple
The occasion adaptability of different bandwidth diverse location number tape limit white noise signal is poor.
The content of the invention
Problem to be solved by this invention is deposited in the current white noise production method mentioned in above-mentioned background technology is avoided
Weak point, and provide a kind of flexible digital band limited white noise production method.The present invention has output signal quantity can
The advantages that tune, signal bandwidth flexibility and changeability, support signal power are separately provided.Design architecture can kept not by parameter configuration
On the premise of change, while export the different number tape limit white noise signal of multiple position differences, adaptive-bandwidth, power.
The object of the present invention is achieved like this, and a kind of production method of flexible digital band limited white noise, it includes step
Suddenly：
1. Whole frequency band numeral white noise signal is produced using mathematical method；
2. the analysis that Whole frequency band numeral white noise signal is sent into the variable Digital Microwave flexibility transponder of bandwidth granularity is filtered
In ripple device group；
3. the frequency band distribution and gain configuration parameter of digital white noise signal, obtain digital white noise caused by as needed
The sub-channel positions and gain adjustment factor for the analysis filter group that signal takes, and analysis filter group subchannel position will be taken
The output signal put is multiplied with gain adjustment factor, and the output signal of other sub-channel positions is multiplied with zero；
4. it is flexible that the output signal of the analysis filter group after Gain tuning is sent into the variable Digital Microwave of bandwidth granularity
It is reconstructed in the synthesis filter group of transponder, generation number tape limit white noise signal.
Wherein, 3. described step is specially：The bandwidth granularity of the variable Digital Microwave flexibility transponder of bandwidth granularity is
Bs is, it is necessary to which the spectrum distribution of caused digital white noise signal is fl~fu, and its gain configuration parameter is N dB, to fl/Bs+1
Carry out down rounding to obtain Ql, fu/Bs is carried out to round to obtain Qu, obtain the son for needing caused digital white noise signal to take
Channel position is Ql to Qu, gain adjustment factor 10N/20；By analysis filter group QlTo QuThe output of sub-channels
Signal and gain adjustment factor 10N/20It is multiplied, the output signal of other subchannels is multiplied with 0；Wherein, flFor number caused by needs
Word white noise signal takes the lower boundary of frequency spectrum, fuThe coboundary of frequency spectrum is taken for digital white noise signal caused by needs.
The present invention has the following advantages that compared to background technology：
The present invention can produce multiple number tape limit white noise signals simultaneously in diverse location, and be configured by external parameter,
Quantity, position, bandwidth and the power of digital white noise signal can freely be changed, and general frame does not have to change, especially suitable for
Some occasions for needing multiple different bandwidth diverse location different capacity number tape limit white noise signals.
Brief description of the drawings
Fig. 1 is the electric theory diagram of the embodiment of the present invention.
Fig. 2 is signal band of the present invention and gain configuration schematic diagram.
Embodiment
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the electric theory diagram of the flexible digital band limited white noise production method of the embodiment of the present invention, and it includes complete
The generation of number of bands white noise, analysis filter group, Gain tuning and synthesis filter group.
Specifically include following steps：
1. Whole frequency band numeral white noise signal is produced using mathematical method；
Whole frequency band numeral white noise signal is produced using BM algorithms in the embodiment of the present invention；
2. Whole frequency band numeral white noise signal is sent into the analysis filter group that bandwidth granularity is 1MHz；
3. according to the frequency band of digital white noise signal caused by the bandwidth granularity and needs of Digital Microwave flexibility transponder point
Cloth, the analysis filter group sub-channel positions that digital white noise signal takes are obtained, obtaining gain according to gain configuration parameter adjusts
Integral divisor；And the output signal of the analysis filter group sub-channel positions of occupancy is multiplied with gain adjustment factor, other sub- letters
The output signal of road position is multiplied with zero；
3. step is specially：The bandwidth granularity of the variable Digital Microwave flexibility transponder of bandwidth granularity is Bs, it is necessary to produce
The spectrum distribution of digital white noise signal be fl~fu, its gain configuration parameter is N dB, and fl/Bs+1 round
To Ql, fu/Bs is carried out to round to obtain Qu, obtain needing caused by the sub-channel positions that take of digital white noise signal be the
Ql to Qu, gain adjustment factor 10N/20, then analysis filter group Ql to Qu sub-channels output signal and gain are adjusted
Integral divisor 10N/20It is multiplied, other subchannel output signals are multiplied with 0；Wherein, fl accounts for for digital white noise signal caused by needs
With the lower boundary of frequency spectrum, fu is the coboundary that digital white noise signal caused by needs takes frequency spectrum.
In the embodiment of the present invention, it is assumed that need to produce the digital white noise letter that gain configuration parameter is 6dB in 0~10MHz
Number 1, produce the digital white noise signal 2 that gain configuration parameter is -6dB in 20~30MHz.By calculating, digital white noise letter
Number 1 occupies the 1st to the 10th sub-channels, gain adjustment factor 2, and digital white noise signal 2 occupies the 21st to the 30th
Subchannel, gain adjustment factor 1/2.Then the sub-channels output signal of analysis filter group the 1st to 10 is multiplied with 2, will be divided
The sub-channels output signal of analysis filterbank the 21st to 30 is multiplied with 1/2, and other subchannel output signals are multiplied with 0, such as Fig. 2 institutes
Show；The gain adjustment factor of analysis filter group output signal can be configured in real time by external parameter, to support that numeral is white
Noise signal frequency band and the adjustment of the dynamic of gain；
4. it is flexible that the output signal of the analysis filter group after Gain tuning is sent into the variable Digital Microwave of bandwidth granularity
It is reconstructed in the synthesis filter group of transponder, generation number tape limit white noise signal.
The step data signal that 4. synthesis filter group reconstructs can be used directly or be sent into upconverter, upconverter
Frequency can arbitrarily adjust as needed, caused number tape limit white noise signal is moved and needs frequency range.
In the embodiment of the present invention, it is assumed that the data signal that synthesis filter group reconstructs is sent into upconverter, such as Fig. 2 institutes
Show, the frequency of upconverter is 1GHz, then can produce the digital white noise signal that gain is 6dB in 1000~1010MHz, simultaneously
The digital white noise signal that gain is -6dB is produced in 1020~1030MHz.
Claims (2)
1. a kind of flexible digital band limited white noise production method, it is characterised in that comprise the following steps：
1. Whole frequency band numeral white noise signal is produced using mathematical method；
2. Whole frequency band numeral white noise signal is sent into the analysis filter of the variable Digital Microwave flexibility transponder of bandwidth granularity
In group；
3. the frequency band distribution and gain configuration parameter of digital white noise signal, obtain digital white noise signal caused by as needed
The sub-channel positions and gain adjustment factor of the analysis filter group of occupancy, and analysis filter group sub-channel positions will be taken
Output signal is multiplied with gain adjustment factor, and the output signal of other sub-channel positions is multiplied with zero；
4. the output signal of the analysis filter group after Gain tuning is sent into the flexible forwarding of the variable Digital Microwave of bandwidth granularity
It is reconstructed in the synthesis filter group of device, generation number tape limit white noise signal.
A kind of 2. flexible digital band limited white noise production method according to claim 1, it is characterised in that：Described step
Suddenly 3. it is specially：The bandwidth granularity of the variable Digital Microwave flexibility transponder of bandwidth granularity is Bs, it is necessary to caused digital white noise
The spectrum distribution of acoustical signal is fl~fu, and its gain configuration parameter is N dB, fl/Bs+1 is carried out down rounding to obtain Ql, to fu/
Bs carries out rounding to obtain Qu, and the sub-channel positions for obtaining needing caused digital white noise signal to take are Ql to Qu,
Gain adjustment factor is 10N/20；By analysis filter group QlTo QuThe output signal of sub-channels and gain adjustment factor 10N /20It is multiplied, the output signal of other subchannels is multiplied with 0；Wherein, flFrequency spectrum is taken for digital white noise signal caused by needs
Lower boundary, fuThe coboundary of frequency spectrum is taken for digital white noise signal caused by needs.
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Cited By (1)
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| CN108880716A (en) * | 2018-07-05 | 2018-11-23 | 中国电子科技集团公司第五十四研究所 | A kind of Satellite Channel Simulator design method based on digital channelizing technology |
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