CN107769873B - Flexible digital band-limited white noise generation method - Google Patents
Flexible digital band-limited white noise generation method Download PDFInfo
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Abstract
The invention discloses a flexible digital band-limited white noise generation method, and mainly relates to digital band-limited white noise generation. The method further improves the applicability of the original digital white noise generation method, adopts a novel realization structure, and can simultaneously output a plurality of digital band-limited white noise signals with different positions, variable bandwidths and different powers through parameter configuration on the premise of keeping the design framework unchanged. The invention has the advantages of adjustable output signal quantity, flexible and variable signal bandwidth, supporting the independent setting of signal power and the like, and is suitable for occasions needing a plurality of digital white noise signals with different bandwidths, different positions and different powers.
Description
Technical Field
The invention relates to a flexible digital band-limited white noise generation method, which is suitable for the fields of radar signal processing, communication system testing, remote control and remote measurement, channel simulation and the like.
Background
White noise generally exists in the whole universe space, and in order to be close to a real environment, a digital white noise signal needs to be artificially added in the fields of radar signal processing, communication system testing, remote control and remote measurement, channel simulation and the like. However, most of the conventional white noise generation methods can only output a digital white noise signal with a fixed bandwidth, are relatively fixed in application, and have poor adaptability to some occasions requiring digital band-limited white noise signals with a plurality of different bandwidths and different positions.
Disclosure of Invention
The present invention is to provide a flexible method for generating digital band-limited white noise, which avoids the disadvantages of the prior art white noise generation methods mentioned above. The invention has the advantages of adjustable output signal quantity, flexible and variable signal bandwidth, supporting independent setting of signal power and the like. By parameter configuration, a plurality of digital band-limited white noise signals with different positions, variable bandwidth and different power can be simultaneously output on the premise of keeping the design framework unchanged.
The object of the present invention is achieved by a flexible method for generating digital band-limited white noise, comprising the steps of:
firstly, generating a full-band digital white noise signal by a mathematical method;
sending the full-band digital white noise signal into an analysis filter bank of a microwave digital flexible repeater with variable bandwidth granularity;
obtaining the subchannel position and gain adjustment factor of the analysis filter group occupied by the digital white noise signal according to the frequency band distribution and gain configuration parameters of the digital white noise signal which needs to be generated, multiplying the output signal occupying the subchannel position of the analysis filter group by the gain adjustment factor, and multiplying the output signals of other subchannel positions by zero;
and fourthly, sending the output signal of the analysis filter bank after the gain adjustment into a comprehensive filter bank of the microwave digital flexible repeater with variable bandwidth granularity for reconstruction to generate a digital band-limited white noise signal.
Wherein, the third step is specifically as follows: the bandwidth granularity of the microwave digital flexible transponder with the variable bandwidth granularity is Bs, the frequency spectrum distribution of the digital white noise signal to be generated is fl-fu, the gain configuration parameter is N dB, the flBs +1 is rounded down to obtain Ql, the fu/Bs is rounded up to obtain Qu, the positions of sub-channels occupied by the digital white noise signal to be generated are Ql to Qu, the gain adjustment factor is 10N/20(ii) a Q < th > of analysis filter banklTo QuOutput signal of subchannel and gain adjustment factor 10N/20Multiplying, and multiplying output signals of other sub-channels by 0; wherein f islOccupying the lower boundary of the spectrum for the digital white noise signal to be generated, fuThe upper boundary of the spectrum is occupied by the digital white noise signal that needs to be generated.
Compared with the background technology, the invention has the following advantages:
the invention can generate a plurality of digital band-limited white noise signals at different positions simultaneously, and can freely change the number, the position, the bandwidth and the power of the digital white noise signals through the configuration of external parameters, and the overall architecture does not need to be changed, thereby being particularly suitable for occasions needing a plurality of digital band-limited white noise signals with different bandwidths, different positions and different powers.
Drawings
FIG. 1 is an electrical schematic block diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of the signal band and gain configuration of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is an electrical schematic block diagram of a flexible digital white noise generation method including full band digital white noise generation, an analysis filter bank, gain adjustment, and a synthesis filter bank in accordance with an embodiment of the present invention.
The method specifically comprises the following steps:
firstly, generating a full-band digital white noise signal by a mathematical method;
in the embodiment of the invention, a BM algorithm is adopted to generate a full-band digital white noise signal;
secondly, sending the full-band digital white noise signal to an analysis filter bank with the bandwidth granularity of 1 MHz;
thirdly, obtaining the position of a sub-channel of an analysis filter set occupied by the digital white noise signal according to the bandwidth granularity of the microwave digital flexible transponder and the frequency band distribution of the digital white noise signal required to be generated, and obtaining a gain adjustment factor according to a gain configuration parameter; multiplying the output signals of the occupied sub-channel positions of the analysis filter bank by a gain adjustment factor, and multiplying the output signals of other sub-channel positions by zero;
the third step is specifically as follows: the bandwidth granularity of the microwave digital flexible transponder with the variable bandwidth granularity is Bs, the frequency spectrum distribution of the digital white noise signal to be generated is fl-fu, the gain configuration parameter is N dB, the flBs +1 is rounded down to obtain Ql, the fu/Bs is rounded up to obtain Qu, the positions of sub-channels occupied by the digital white noise signal to be generated are Ql to Qu, the gain adjustment factor is 10N/20Then the Ql to Qu sub-channel output signals of the analysis filter bank and the gain adjustment factor 10 are analyzedN/20Multiplying, and multiplying other subchannel output signals by 0; fl is a lower boundary of a frequency spectrum occupied by the digital white noise signal to be generated, and fu is an upper boundary of the frequency spectrum occupied by the digital white noise signal to be generated.
In the embodiment of the invention, it is assumed that a digital white noise signal 1 with a gain configuration parameter of 6dB is required to be generated at 0-10 MHz, and a digital white noise signal 2 with a gain configuration parameter of-6 dB is generated at 20-30 MHz. By calculation, the digital white noise signal 1 occupies the 1 st to 10 th sub-channels and has a gain adjustment factor of 2, and the digital white noise signal 2 occupies the 21 st to 30 th sub-channels and has a gain adjustment factor of 1/2. The analysis filter bank 1 to 10 sub-channel output signals are multiplied by 2, the analysis filter bank 21 to 30 sub-channel output signals are multiplied by 1/2, and the other sub-channel output signals are multiplied by 0, as shown in fig. 2; the gain adjustment factor of the output signal of the analysis filter bank can be configured in real time through external parameters so as to support the dynamic adjustment of the frequency band and the gain of the digital white noise signal;
and fourthly, sending the output signal of the analysis filter bank after the gain adjustment into a comprehensive filter bank of the microwave digital flexible repeater with variable bandwidth granularity for reconstruction to generate a digital band-limited white noise signal.
And fourthly, directly using the digital signal reconstructed by the comprehensive filter bank or sending the digital signal into an up-converter, wherein the frequency point of the up-converter can be randomly adjusted according to needs, and the generated digital band-limited white noise signal is moved to a needed frequency band.
In the embodiment of the invention, assuming that the digital signal reconstructed by the integrated filter bank is sent to the up-converter, as shown in fig. 2, the frequency point of the up-converter is 1GHz, a digital white noise signal with a gain of 6dB can be generated at 1000-1010 MHz, and a digital white noise signal with a gain of-6 dB can be generated at 1020-1030 MHz.
Claims (2)
1. A flexible digital band-limited white noise generation method, comprising the steps of:
firstly, generating a full-band digital white noise signal by a mathematical method;
sending the full-band digital white noise signal into an analysis filter bank of a microwave digital flexible repeater with variable bandwidth granularity;
obtaining the subchannel position and gain adjustment factor of the analysis filter group occupied by the digital white noise signal according to the frequency band distribution and gain configuration parameters of the digital white noise signal which needs to be generated, multiplying the output signal occupying the subchannel position of the analysis filter group by the gain adjustment factor, and multiplying the output signals of other subchannel positions by zero;
and fourthly, sending the output signal of the analysis filter bank after the gain adjustment into a comprehensive filter bank of the microwave digital flexible repeater with variable bandwidth granularity for reconstruction to generate a digital band-limited white noise signal.
2. A flexible digital band-limited white noise generation method as defined in claim 1, wherein: the third step is specifically as follows: the bandwidth granularity of the microwave digital flexible transponder with the variable bandwidth granularity is Bs, the frequency spectrum distribution of the digital white noise signal to be generated is fl-fu, the gain configuration parameter is N dB, the flBs +1 is rounded down to obtain Ql, the fu/Bs is rounded up to obtain Qu, the positions of sub-channels occupied by the digital white noise signal to be generated are Ql to Qu, the gain adjustment factor is 10N/20(ii) a Q < th > of analysis filter banklTo QuOutput signal of subchannel and gain adjustment factor 10N /20Multiplying, and multiplying output signals of other sub-channels by 0; wherein f islOccupying the lower boundary of the spectrum for the digital white noise signal to be generated, fuThe upper boundary of the spectrum is occupied by the digital white noise signal that needs to be generated.
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| CN202261168U (en) * | 2011-09-29 | 2012-05-30 | 中国电子科技集团公司第五十四研究所 | Generating apparatus for generating Gauss white noise with digit high precision and variable bandwidths |
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