CN114095967B - Method for evaluating out-of-band interference of ultra-wideband signal - Google Patents
Method for evaluating out-of-band interference of ultra-wideband signal Download PDFInfo
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- CN114095967B CN114095967B CN202111374495.0A CN202111374495A CN114095967B CN 114095967 B CN114095967 B CN 114095967B CN 202111374495 A CN202111374495 A CN 202111374495A CN 114095967 B CN114095967 B CN 114095967B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a method for evaluating the interference of an ultra-wideband signal to the outside of a frequency band, which comprises the steps of converting a frequency mask from a logarithmic coordinate system to a linear coordinate system, then showing the power density spectrum of the ultra-wideband signal under the same coordinate system, and normalizing sampling signals of an oscilloscope by taking the maximum value of the mask as the reference, so that the equivalent isotropic radiation power peak value of the ultra-wideband signal in the power density spectrum is equal to the limit condition of the frequency mask; the sum of the frequency bandwidth of the ultra-wideband signal power density spectrum which is out of the limit range of the frequency mask and the total power which is beyond the regulation of the frequency mask is calculated in an investigation frequency range, the interference degree of any ultra-wideband signal to other frequency bands can be measured by using the two parameters, the interference amount of the ultra-wideband signal to other frequency bands or the loss amount of filtered energy can be quantitatively analyzed, and the interference degree of the ultra-wideband signal to other signals out of the frequency bands is further evaluated.
Description
Technical Field
The invention belongs to the field of ultra-wideband communication, and particularly relates to a method for evaluating out-of-band interference of ultra-wideband signals.
Background
With the continuous progress of information technology, various wireless short-distance transmission technologies such as WiMAX, bluetooth, wi-Fi and Zigbee are produced and continuously developed, but the technologies cannot overcome the disadvantages of low speed, large signal transmission power, poor confidentiality, and the like. The ultra-wideband technology provides a good solution for future wireless short-distance communication due to the advantages of extremely wide bandwidth, high transmission rate, low transmission power, low power consumption, good confidentiality and the like.
Ultra-wideband technology, as defined by the federal communications commission in the united states, refers to radio frequency signals having an operating frequency in the range of 3.1-10.6GHz and a signal bandwidth greater than 500MHz or a fractional bandwidth greater than 20%. To limit power consumption, it is further specified that its equivalent isotropic radiated power is less than-41.3 dBm/MHz. However, even if the peak power is lower than the limit value, part of the energy of the ultra-wideband signal in the frequency spectrum may exceed the range of the frequency band in which the ultra-wideband signal is located, and cause interference to signals in other frequency bands. The federal communications commission in the united states further specifies a spectrally defined shape, i.e., a frequency mask, of its transmitted signal to limit the equivalent isotropic radiated power of an ultra-wideband signal, as shown in fig. 1. The interference of the ultra-wideband signal completely within the frequency spectrum and power limits of the frequency mask plate to other frequency bands is small and can be ignored. Thus, for such signals, the federal communications commission in the united states provides that it can be used directly without applying for license plates. However, in practice, the used ultra-wideband signal is difficult to completely conform to the limit of the frequency mask, and for the excessive spectrum part, the ultra-wideband signal can be filtered by designing a proper filter to obtain the ultra-wideband signal capable of being used without license plates. The filtering process, however, corresponds to a loss of signal energy, to the extent that the original signal interferes with other frequency bands. There is no relevant study on the amount of such interference or the amount of energy loss after filtering.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for evaluating the out-of-band interference of an ultra-wideband signal.
The specific technical scheme of the invention is as follows: a method for evaluating out-of-band interference of ultra-wideband signals specifically comprises the following steps:
and 3, observing and calculating the sum of the total width of the frequency band of the ultra-wideband signal power density spectrum outside the limit range of the frequency mask and the total power beyond the regulation of the frequency mask in the inspected frequency range, wherein the obtained specific numerical value is the parameter W ob And P ob Respectively represent, wherein, W ob Is defined to represent the sum of all bandwidths outside the limits of the frequency mask in the range under investigation, the value of which directly reflects the range of out-of-band interference of the ultra-wideband signal, P ob Is defined to represent the sum of all powers outside the limits of the frequency mask within the range under investigation, the value of which directly reflects the degree of interference of the ultra-wideband signal with the out-of-band signal.
Further, W ob And P ob The specific calculation method is as follows:
W ob ＝∑W i
wherein, W i The bandwidth, P, of the ith frequency band indicating that the power spectrum of the ultra-wideband signal exceeds the limit of the frequency mask signal Representing the power density, P, of an ultra-wideband signal mask Indicating the power density specified by the reticle.
The invention has the beneficial effects that: according to the method, a frequency mask is converted into a linear coordinate system from a logarithmic coordinate system, then a power density spectrum of an ultra-wideband signal is shown in the same coordinate system, and an oscilloscope sampling signal is subjected to normalization processing by taking the maximum value of the mask as a reference, so that the equivalent isotropic radiation power peak value of the ultra-wideband signal in the power density spectrum is equal to the limiting condition of the frequency mask; the sum of the frequency bandwidth of the power density spectrum of the ultra-wideband signal, which falls outside the limit range of the frequency mask, and the total power beyond the regulation of the frequency mask is calculated in an investigation frequency range, the interference degree of any ultra-wideband signal to other frequency bands can be measured by using the two parameters, the interference amount of the ultra-wideband signal to other frequency bands or the loss amount of filtered energy can be quantitatively analyzed, and the interference degree of the ultra-wideband signal to other signals outside the frequency bands is further evaluated.
Drawings
FIG. 1 is a schematic illustration of a frequency mask specified by the Federal communications Commission in the United states;
FIG. 2 is a schematic diagram of a second-order ultra-wideband signal time-domain waveform in an example;
fig. 3 is a schematic diagram of a power density spectrum of a second-order ultra-wideband signal under reticle-limited conditions in an example.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
The method for evaluating the interference of the ultra-wideband signal to the out-of-band specifically comprises the following steps:
And 2, under the same linear coordinate system, expressing the power density spectrum of the ultra-wideband signal to be evaluated, and carrying out normalization processing on the power density of the ultra-wideband signal, so that the equivalent isotropic radiation power peak value of the ultra-wideband signal in the power density spectrum is equal to the limit condition of the frequency mask.
And 3, observing and calculating the sum of the total width of the frequency band of the ultra-wideband signal power density spectrum outside the limit range of the frequency mask and the total power beyond the regulation of the frequency mask in the inspected frequency range, wherein the obtained specific numerical value is the parameter W ob And P ob Respectively represent, wherein, W ob Is defined to represent the sum of all the bandwidths outside the limits of the frequency mask in the range under investigation, the value of which directly reflects the range of the interference of the ultra-wideband signal outside the band, P ob Is defined to represent the sum of all powers outside the limits of the frequency mask within the range under investigation, the value of which directly reflects the degree of interference of the ultra-wideband signal with the out-of-band signal.
In this embodiment, W ob And P ob The specific calculation method of (2) is as follows:
W ob ＝∑W i
wherein, W i Indicating the power spectrum of the ultra-wideband signal exceeds the frequency bandwidth, P, of the ith frequency band limited by the frequency mask signal Representing the power density, P, of an ultra-wideband signal mask Indicating the power density specified by the reticle.
Considering that the method of generating an ultra-wideband signal by taking the derivatives of the gaussian pulses in each order during the actual signal generation process is relatively simple, the signal generation system is relatively easy to construct. In addition, in the current research, the ultra-wideband signal directly generated in the optical domain mostly adopts the form of the derivatives of the gaussian pulse in each order, and the ultra-wideband signal generated by the optics can be directly applied to an optical Fiber ultra-wideband system (UWB-over-Fiber) without the process of electro-optical conversion, so that the system application is very convenient. Here, an ultra wideband signal whose waveform is a second derivative of the gaussian pulse, that is, a second-order ultra wideband signal is taken as an example to illustrate a specific implementation manner of the method of the present invention. In fact, for any ultra-wideband signal received in the oscilloscope, the method can be used for analyzing the interference degree of the ultra-wideband signal on other signals.
An example of the second-order ultra-wideband pulse signal obtained by taking the second derivative of a gaussian pulse with a full width at half maximum of 80ps is used in the present embodiment, and the time domain waveform is shown in fig. 2. Fig. 3 shows the power density spectrum of the second-order ultra-wideband signal in a linear coordinate system, and the shape of the frequency mask in the linear coordinate system.
It should be noted that the reason why the power density spectrum is expressed in a linear coordinate system is that P ob Representing the total power of the over-frequency mask, this parameter requires the integral summation of all over-frequency mask portion powers, which is more conveniently done in a linear coordinate system.
In fig. 3, the power density spectrum of the second-order ultra-wideband signal exceeds the limit condition of the frequency mask in three frequency band regions, and the total exceeding frequency bandwidth is 2.51GHz, namely W ob =2.51GHz; the shaded area in the figure represents the power value of the second-order ultra-wideband signal, the power density spectrum of which exceeds the limit of the frequency mask plate, and the power density spectrum of which exceeds the limit of the frequency mask plateThe sum of the shadow area results in an over-total power of 9.16 x 10 -7 W, i.e. P ob ＝9.16×10 -7 W。
The method can be seen in the invention, the frequency mask is converted into a linear coordinate system from a logarithmic coordinate system, then the power density spectrum of the ultra-wideband signal is shown in the same coordinate system, and the sampling signal of the oscilloscope is normalized by taking the maximum value of the mask as the reference, so that the equivalent isotropic radiation power peak value of the ultra-wideband signal in the power density spectrum just does not exceed the limit condition of the frequency mask; the sum of the frequency bandwidth of the ultra-wideband signal power density spectrum which is out of the limit range of the frequency mask and the total power which is beyond the regulation of the frequency mask is calculated in an investigation frequency range, the interference degree of any ultra-wideband signal to other frequency bands can be measured by using the two parameters, the interference amount of the ultra-wideband signal to other frequency bands or the loss amount of filtered energy can be quantitatively analyzed, and the interference degree of the ultra-wideband signal to other signals out of the frequency bands is further evaluated.
In summary, the present invention provides a method for evaluating out-of-band interference of an ultra-wideband signal under an emission-limiting template, which intuitively quantifies the degree of interference of the ultra-wideband signal with other signals operating in a frequency band shared with the ultra-wideband signal. The method of the present invention is applicable not only to the frequency mask limits specified by the Federal communications Commission in the United states, but also to frequency mask limits specified in other countries and regions (e.g., europe, japan, china, etc.).
Claims (1)
1. A method for evaluating out-of-band interference of ultra-wideband signals specifically comprises the following steps:
step 1, converting an emission limiting template from a logarithmic coordinate system to a linear coordinate system;
step 2, under the same linear coordinate system, representing the power density spectrum of the ultra-wideband signal to be evaluated, and carrying out normalization processing on the power density of the ultra-wideband signal, so that the equivalent isotropic radiation power peak value of the ultra-wideband signal in the power density spectrum is equal to the limit condition of a frequency mask;
and 3, observing and calculating the sum of the total width of the frequency band of the ultra-wideband signal power density spectrum outside the limit range of the frequency mask and the total power beyond the regulation of the frequency mask in the inspected frequency range, wherein the obtained specific numerical value is the parameter W ob And P ob Respectively represent wherein W ob Is defined to represent the sum of all bandwidths outside the limits of the frequency mask in the range under investigation, the value of which directly reflects the range of out-of-band interference of the ultra-wideband signal, P ob Is defined to represent the sum of all powers exceeding the limits of the frequency mask within the range under investigation, the value of which directly reflects the degree of interference of the ultra-wideband signal with the out-of-band signal;
W ob and P ob The specific calculation method is as follows:
W ob ＝∑W i
wherein, W i The bandwidth, P, of the ith frequency band indicating that the power spectrum of the ultra-wideband signal exceeds the limit of the frequency mask signal Representing the power density, P, of an ultra-wideband signal mask Indicating the power density specified by the reticle.
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