CN113890642B - Method and device for checking communication system receiver - Google Patents
Method and device for checking communication system receiver Download PDFInfo
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Abstract
The invention provides a method and a device for checking a communication system receiver, wherein the method comprises the following steps: according to the working index of the receiver, determining the gain noise of each active device in an analog receiving link of the receiver; calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link; and calculating a difference value between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference value with a preset threshold value, and obtaining a detection result of the receiver according to a comparison result. The invention realizes simple and efficient inspection of the receiver.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for inspecting a receiver of a communication system.
Background
In verifying whether the performance of a communication system receiver meets system index requirements, it is generally determined by testing the system reception sensitivity or system noise.
The receiving sensitivity of the test system needs to build a whole set of communication system, uses the baseband processing unit to cooperate with the test, and is also strongly related to the demodulation capability of the baseband processing unit. The test system is built by hardware, software and testers in cooperation.
When the index of the test system does not meet the system requirement, whether the environment built by the test system is correct or not and whether the software version is correct or not need to be excluded. In the case that the received power is smaller than the received sensitivity level, the conventional positioning method needs to provide a software version, and firstly inputs a large signal in a linear region, and judges through demodulating the signal. If demodulation is impossible, the problem may be that the link is not enabled or that the demodulation algorithm is problematic; if the large signal in the linear region can be demodulated, the small signal is input. If the demodulation fails, the link noise problem or the demodulation algorithm problem can be solved.
In the conventional problem of sensitivity of the positioning complete machine, three parts including analog, intermediate frequency and baseband are involved, the problem needs to be checked from the whole system, and the checking process is complex and has low efficiency.
Disclosure of Invention
The invention provides a method and a device for checking a receiver of a communication system, which are used for solving the defects of complex checking process and low efficiency of the receiver in the prior art and realizing simple and efficient checking of the receiver.
The invention provides a communication system receiver checking method, which comprises the following steps:
according to the working index of the receiver, determining the gain noise of each active device in an analog receiving link of the receiver;
calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link;
and calculating a difference value between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference value with a preset threshold value, and obtaining a detection result of the receiver according to a comparison result.
According to the method for checking the receiver of the communication system, the working index comprises preset noise coefficients of the analog receiving link, maximum input useful signal power of the receiver and preset conditions met by the noise coefficients of the receiving signal of the analog receiving link;
the preset condition comprises that when the input signal intensity of the receiver is a first preset intensity value, the noise coefficient of the received signal is a first preset coefficient value; when the input signal strength increases from the first preset strength value to a second preset strength value, the received signal noise coefficient increases from the first preset coefficient value to a second preset coefficient value; and when the input signal strength is greater than the second preset strength value, the noise coefficient of the received signal is greater than the second preset coefficient value.
According to the method for checking the receiver of the communication system, the gain noise of each active device in the analog receiving link of the receiver is determined according to the working index of the receiver, and the method comprises the following steps:
determining the minimum gain and the maximum gain of the analog receiving link according to the working index of the receiver, and determining the first gain of the analog receiving link according to the minimum gain and the maximum gain;
calculating a second gain of the analog receive chain when the received signal of the receiver reaches an in-band maximum block;
taking the difference between the first gain and the second gain as gain noise of a gain attenuation device in the analog receiving link;
calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power;
and taking the difference value between the second gain and the third gain as gain noise of a first-stage amplifier in the analog receiving link, and bypassing a second-stage amplifier in the analog receiving link.
According to the method for checking the receiver of the communication system, the minimum gain and the maximum gain of the analog receiving link are determined according to the working index of the receiver, and the method comprises the following steps:
adding a preset contribution noise coefficient of an ADC of a receiver and a preset noise coefficient of the analog receiving link to obtain a noise coefficient design value of the receiver;
calculating the minimum gain of the analog receiving link according to the preset noise coefficient of the analog receiving link, the noise coefficient design value of the receiver and the preset equivalent noise coefficient of the ADC;
calculating the peak power of a signal input to the ADC when the ADC is full-scale according to the maximum receiving level of the ADC and the second preset coefficient value;
and calculating the maximum gain of the analog receiving link according to the in-band amplitude unevenness of the analog receiving link, the peak-to-average ratio of the receiving signal, the reserved margin, the minimum value of the dynamic range in the 3GPP Local and the signal peak power.
According to the present invention, a method for checking a receiver of a communication system, when a received signal of the receiver reaches an in-band maximum blocking, calculates a second gain of the analog receiving link, comprising:
calculating a second gain of the analog receiving link according to the preset in-band amplitude unevenness of the analog receiving link, the preset peak-to-average ratio of the received signal, the preset reserved margin, the in-band maximum blocking and the signal peak power;
and calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power, including:
and calculating a third gain of the analog receiving link according to the preset in-band amplitude unevenness of the analog receiving link, the preset peak-to-average ratio of the receiving signal, the preset reserved margin, the maximum input useful signal power and the signal peak power.
According to the method for checking the receiver of the communication system provided by the invention, the noise coefficient estimated value of the analog receiving link is calculated according to the gain noise of each active device, and the noise coefficient estimated value of the receiver is calculated according to the noise coefficient estimated value of the analog receiving link, and the method comprises the following steps:
calculating a noise coefficient estimated value of the analog receiving link under ACS according to the gain of the intermediate frequency part of the analog receiving link, the noise coefficient design value of the receiver, the gain noise of the gain attenuation device and the second preset coefficient value;
calculating a contribution noise coefficient estimation value of the ADC according to a preset equivalent noise coefficient of the ADC of the receiver and the second gain;
and adding the noise coefficient estimated value of the analog receiving link under ACS to the contribution noise coefficient estimated value of the ADC to obtain the noise coefficient estimated value of the receiver.
According to the method for checking the receiver of the communication system provided by the invention, the checking result of the receiver is obtained according to the comparison result, and the method comprises the following steps:
acquiring an estimated value of the second preset coefficient value according to the first preset coefficient value, a first preset intensity value, the in-band maximum obstruction and the preset threshold;
and if the difference value is smaller than the preset threshold value and the estimated value of the second preset coefficient value is larger than or equal to the second preset coefficient value, the checking result of the receiver is obtained to be normal, otherwise, the checking result of the receiver is abnormal.
The invention also provides a communication system receiver checking device, which comprises:
the determining module is used for determining gain noise of each active device in an analog receiving link of the receiver according to the working index of the receiver;
the calculation module is used for calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link;
and the checking module is used for calculating the difference between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference with a preset threshold value, and acquiring a checking result of the receiver according to a comparison result.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the communication system receiver inspection method as described in any of the above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a method of inspecting a communication system receiver as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor carries out the steps of a method of checking a receiver of a communication system as described in any one of the above.
According to the method and the device for checking the receiver of the communication system, provided by the invention, the gain noise of each active device in the analog receiving link of the receiver is determined according to the working index of the receiver, so that the total noise of the receiver system under no blocking can be ensured, and the reliability of the design of the analog receiving link is ensured; when the test is carried out, the test is only carried out on the analog part of the receiver, whether the noise coefficient of the analog receiving link meets the design requirement is estimated, the possible faults of the baseband part can be eliminated without entering the actual demodulation part, the test equipment is reduced, and the test is simple and efficient.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for checking a receiver of a communication system according to the present invention;
fig. 2 is a graph of SNR in a method for inspecting a receiver of a communication system according to the present invention;
fig. 3 is a schematic diagram of an analog receiving link system architecture in a method for checking a receiver of a communication system according to the present invention;
FIG. 4 is a simplified schematic diagram of a receiver architecture in a method for inspecting a receiver of a communication system according to the present invention;
fig. 5 is a simplified schematic diagram of an analog receiving link system architecture in a method for verifying a receiver of a communication system according to the present invention;
fig. 6 is a schematic structural diagram of a receiver inspection device of the communication system provided by the invention;
fig. 7 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method for verifying a receiver of a communication system according to the present invention will be described with reference to fig. 1, comprising: step 101, according to the working index of the receiver, determining the gain noise of each active device in the analog receiving link of the receiver;
the SNR (Signal Noise Ratio, signal-to-noise ratio) is used to determine the gain noise of each active device in the analog receiving link of the receiver, and the working index requirements related to the receiver need to be determined first.
Step 102, calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link;
the receiver includes other parts in addition to the analog receiving chain. And obtaining the noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link and the noise coefficients of other parts. The present embodiment is not particularly limited to other portions.
Step 103, calculating the difference between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference with a preset threshold value, and obtaining the checking result of the receiver according to the comparison result.
The noise figure design value of the receiver refers to the noise figure required by the receiver. Comparing the noise coefficient estimated value with the noise coefficient design value of the receiver, if the two are different greatly, the checking result is abnormal, otherwise, the checking result is normal.
According to the embodiment, the gain noise of each active device in the analog receiving link of the receiver is determined according to the working index of the receiver, so that the total noise of the receiver system under no blocking can be ensured, and the reliability of the design of the analog receiving link is ensured; when the test is carried out, the test is only carried out on the analog part of the receiver, whether the noise coefficient of the analog receiving link meets the design requirement is estimated, the possible faults of the baseband part can be eliminated without entering the actual demodulation part, the test equipment is reduced, and the test is simple and efficient.
On the basis of the above embodiment, the working index in this embodiment includes preset conditions satisfied by a preset noise factor NF1 of the analog receiving link, a maximum input useful signal power Pmax of the receiver, and a received signal noise factor SNR of the analog receiving link;
the preset condition includes that when the input signal strength P1 of the receiver is a first preset strength value, the noise coefficient SNR of the received signal is a first preset coefficient value SNR1;
when the input signal strength increases from the first preset strength value P1 to a second preset strength value P2, the received signal noise coefficient SNR increases from the first preset coefficient value SNR1 to a second preset coefficient value SNR2;
when the input signal strength is greater than the second preset strength value P2, the received signal noise coefficient SNR is ensured to be greater than the second preset coefficient value SNR2. A graph of SNR is shown in fig. 2.
For example, the preset conditions to be satisfied by the received signal noise ratio SNR are shown in table 1.
TABLE 1 preset conditions to be met by the received Signal noise factor SNR
On the basis of the foregoing embodiment, in this embodiment, determining gain noise of each active device in an analog receiving link of a receiver according to an operation index of the receiver includes: determining the minimum gain and the maximum gain of the analog receiving link according to the working index of the receiver, and determining the first gain of the analog receiving link according to the minimum gain and the maximum gain;
alternatively, empirically, an intermediate value between the minimum gain and the maximum gain is taken as the first gain of the analog receive chain. The first gain is the maximum gain of the base station under the small signal of the analog receiving link.
Calculating a second gain of the analog receive chain when the received signal of the receiver reaches an in-band maximum block;
taking the difference between the first gain and the second gain as gain noise of a gain attenuation device in the analog receiving link;
if the difference between the first gain and the second gain is greater than 0, it means that the useful signal is still small, so that the gain attenuator is placed at the last stage of the analog receiving link, i.e. the intermediate frequency part, to ensure that the noise figure NF of the analog receiving link is minimized. The gain attenuation device may use a DVGA (Digital Variable Gain Amplifier, digitally controlled variable gain amplifier) device to ensure the gain control range.
Calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power;
and taking the difference value between the second gain and the third gain as gain noise of a first-stage amplifier in the analog receiving link, and bypassing a second-stage amplifier in the analog receiving link.
If the difference between the second gain and the third gain is greater than 0, it indicates that the signal link is in a large signal area at this time, which is a useful signal. To ensure minimal distortion of the signal and to account for system noise problems, it is considered to bypass the second stage amplifier (Low Noise Amplifier, LNA) and thus take this difference as the gain noise of the first stage amplifier.
The schematic diagram of the architecture of the analog receiving link can be obtained as shown in fig. 3, wherein the front-end filter is mainly used for selecting useful signals and suppressing useless signals; LNA1 and LNA2 are mainly used for amplifying tiny useful signals; the filter 1 further suppresses co-location and blocking spurious of an antenna port and also filters distortion signals generated by the LNA; the mixer reduces RF (Radio Frequency) to IF (Intermediate Frequency ); the filter 2 selects an IF filter to filter out other signals generated by mixing; the DVGA amplifies the IF signal and performs link gain adjustment under different conditions; an anti-aliasing filter is connected to the ADC inlet. The ADC output is connected to a digital filter, which mainly filters out near-end interference of signals, such as ACS (Adjacent Channel Selectivity ) signals. The selection index of each stage of filter is mainly based on the system requirement.
In ACS, gain change is performed by DVGA, maximum signal, gain change is performed by LNA 2. The filter inhibition index is determined by 3GPP specifications, and the total noise of the system under no blocking is ensured by reasonably selecting the gain noise of each active device.
The system inherent noise change caused by gain change can be calculated, but the system signal-to-noise ratio reduction caused by distortion can not be quantized, the SNR is used for verifying the nonlinear characteristic of a link, if the requirement is not met, a device with high P1dB can be selected, so that the input and output signals of an active device do not exceed the P1dB compression point, and the suppression of the distortion components by the filter 1, the filter 2 and the anti-aliasing filter can be reasonably adjusted. The gain variation can be controlled by the FPGA checking the power level.
On the basis of the foregoing embodiment, in this embodiment, determining, according to the working index of the receiver, the minimum gain and the maximum gain of the analog receiving link includes: adding a preset contribution noise coefficient of an ADC (Analog to Digital Converter, analog-to-digital converter) of a receiver and a preset noise coefficient of the analog receiving link to obtain a noise coefficient design value of the receiver;
as shown in fig. 4, the analog receiving link section is collectively called an analog section, and the entire receiver can be divided into an analog section and an ADC section.
When the noise factor of the preset contribution of the ADC to the system is NFadc, the noise factor design value nfsys1=nf1+nfadc of the receiver. For example, when NFadc is 0.2, the power noise figure NF1 under a small signal is 3.5dB, and NFsys1 is obtained as 3.7dB.
When the input signal is P1, the SNR is SNR1, and the minimum sensitivity of the system is NFsys+P1= -99 dBm-4.7= -103.7dBm.
When the input signal is from-99 dBm to-74 dBm in the requirement, the system is in a linear state, and the SNR is linearly increased at the moment, namely the signal power of each stage of the link is far smaller than the P1dB power of each stage of analog devices.
Calculating the minimum gain of the analog receiving link according to the preset noise coefficient of the analog receiving link, the noise coefficient design value of the receiver and the preset equivalent noise coefficient of the ADC;
assuming that the preset contribution noise figure of the ADC is 0.2dB, the preset equivalent noise figure of the ADC is 27dB. From nf1=3.5 dB, nfsys1=3.7db, nf2=27 dB, nf=10logf, fsys=f1+ (F2-1)/G1, it is found that g1=37 dB, i.e. the minimum gain G1min that the analog receiving link needs to provide at this time is 37dB.
Calculating the peak power of a signal input to the ADC when the ADC is full-scale according to the maximum receiving level of the ADC and the second preset coefficient value;
the maximum acceptable level of the receiving ADC is 2Vp-p@200 ohms, and the peak power Pk-k=10 Log ((Vp-p/2)/(2/200) +snr 2= +7dbm of the signal input to the ADC at full scale of the ADC.
And calculating the maximum gain of the analog receiving link according to the in-band amplitude unevenness of the analog receiving link, the peak-to-average ratio of the receiving signal, the reserved margin, the minimum value of the dynamic range in the 3GPP Local and the signal peak power.
Considering that the in-band amplitude unevenness of a receiving channel is 3dB, the peak-to-average ratio PAR of a receiving signal is 7.5dB, the reserved margin Pg of the system is 6dB, the minimum Pi of the dynamic range in the 3GPP Local is taken as minus 62.2dBm, and Po is taken as Pk-k. According to the formula pi+g+par+pg+3 db=po, the maximum gain g1max= +7dBm- ((-62.2) +7.5) -6dB-3 db=52.7 dB of the analog receiving link is obtained.
The range of the first gain G1 is (37 dB,52.7 dB), and 45dB is taken as the maximum gain of the base station under the small link signal.
On the basis of the foregoing embodiment, in this embodiment, when the received signal of the receiver reaches the in-band maximum blocking, calculating the second gain of the analog receiving link includes: calculating a second gain of the analog receiving link according to the preset in-band amplitude unevenness of the analog receiving link, the preset peak-to-average ratio of the received signal, the preset reserved margin, the in-band maximum blocking and the signal peak power;
when the received signal reaches the in-band maximum blocking ACS Local, the signal size is Pqs +6dB at this time, assuming that the link noise increases by 6dB. The gain calculation formula is adjusted to Pqs +6db+g2+par+3db=pk-k. When ACS Local is-41 dBM, g2= +7dBM- (-41+7.5) -6dB-3 db=31.5 dB, where the analog receive link gain requires attenuation g1-g2=45-31.5=13.5 dB.
Because the useful signal is still small at this point, the attenuation of the gain is placed in the intermediate frequency IF (Intermediate Frequency ) section of the last stage of the analog link to ensure that the noise figure NF of the link is minimized, DVGA devices can be used to ensure the gain control range. That is, the analog architecture at this time may be subdivided into analog components and DVGA devices.
And calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power, including: and calculating a third gain of the analog receiving link according to the preset in-band amplitude unevenness of the analog receiving link, the preset peak-to-average ratio of the receiving signal, the preset reserved margin, the maximum input useful signal power and the signal peak power.
G3 is derived from pmax+6db+g3+par+3db=pk-k when the input signal power is the maximum useful signal Pmax. G3= +7dBm- ((-25) +7.5) -6dB-3 db=15.5 dB at Pmax-25 dBN, corresponding to a gain attenuation of g2-g3=31.5-15.5=16 dB with blocking.
In this case in the large signal region, but the signal is still useful, to ensure minimal distortion of the signal and to account for system noise, it is contemplated that the second stage amplifier be bypassed, and thus the first stage amplifier gain be approximately G2-G3. That is, the analog section architecture at this time can be subdivided into an analog section, a first stage amplifier LNA1, a second stage amplifier LNA2, and a DVGA device.
On the basis of the foregoing embodiment, in this embodiment, the calculating a noise coefficient estimation value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimation value of the receiver according to the noise coefficient estimation value of the analog receiving link includes: calculating a noise coefficient estimated value of the analog receiving link under ACS according to the gain of the intermediate frequency part of the analog receiving link, the noise coefficient design value of the receiver, the gain noise of the gain attenuation device and the second preset coefficient value;
the designed analog receiving link is checked by SNR, and is divided into two parts, RF (Radio Frequency) and IF, as shown in fig. 5.
Taking the gain of the IF part as Gif, the noise factor introduced by the IF part as NFif, and estimating the total noise factor NFsys of the system in ACS according to Fsys=F1+ (F2-1)/G. Comparing the noise figure design value NFsys1 of the receiving link system, if the difference value of the noise figure design value NFsys1 and the receiving link system is smaller than the worsened 6dB noise under the ACS, the receiver is not satisfied with the system design requirement during the ACS.
For example, under ACS, g1=45 dB, g2=31.5 dB, i.e., gain attenuation is 13.5dB. Grf1=30db, grf=31.5 dB, taking the intermediate frequency part gain as 15dB, fif1=10 (15/10) =31.62.
From fsys1=frf1+ (FIF 1-1)/Grf 1, fsys1=10 (3.7/10), frf1=2.207, nfrf1= 3.438dB is obtained.
NFIF2＝13.5+10logFIF1＝13.5+10log31.62＝28.5dB，FIF2＝10^(28.5/10)＝707.95。
Fsys2=frf1+ (FIF 2-1)/grf1= 2.9149, i.e. nfsys2= 4.646dB, results. The total system noise fsys=fsys2+fadc= 3.2697, i.e. nfsys=5.145 dB
Calculating a contribution noise coefficient estimation value of the ADC according to a preset equivalent noise coefficient of the ADC of the receiver and the second gain;
the ADC contribution noise estimate is fadc= (F2-1)/g= (10 (27/10) -1)/10 (31.5/10) = 0.3548.
And adding the noise coefficient estimated value of the analog receiving link under ACS to the contribution noise coefficient estimated value of the ADC to obtain the noise coefficient estimated value of the receiver.
The noise figure estimate fsys=fsys2+fadc= 3.2697 of the receiver, i.e. nfsys=5.145 dB.
Fsys is compared with the noise figure design value NFsys1 of the receiving link system, and if the difference value between the two is larger than or equal to the deteriorated 6dB noise under ACS, the detection result is abnormal. Compared with the system noise coefficient of 3.7dB, the total noise coefficient is increased by 1.45dB, namely, the total noise coefficient is far smaller than the worsening 6dB noise under ACS, and the saturation distortion sum can be smaller than 4.55dB.
When the received signal is the maximum useful signal Pmax, the same calculation method of the noise coefficient estimated value under ACS is adopted to obtain the noise coefficient estimated value of the analog receiving link under the maximum useful signal.
And calculating a noise coefficient estimated value of the analog receiving link under the maximum useful signal according to the gain of the radio frequency part of the analog receiving link, the noise coefficient design value of the receiver, the gain noise of the first-stage amplifier and the second preset coefficient value.
At-25 dBm, the noise figure estimate nfsys=14.7 dB for the analog receive chain at the maximum useful signal is obtained. Compared with the system noise coefficient of 3.7dB, the noise coefficient is increased by 11dB.
From nf= (RS-snr+pg) - (ktb+bg), when snr=0, RS is-92.8 dBm, i.e., noise power is-92.8 dBm. At this time, the SNR is required to be larger than 30dB, namely, the noise power can be smaller than-55 dBm, so that the noise power is-92.8 dBm, and the design requirement is met.
On the basis of the foregoing embodiment, the obtaining, according to the comparison result, the inspection result of the receiver in this embodiment includes: acquiring an estimated value of the second preset coefficient value according to the first preset coefficient value, a first preset intensity value, the in-band maximum obstruction and the preset threshold; and if the difference value is smaller than the preset threshold value and the estimated value of the second preset coefficient value is larger than or equal to the second preset coefficient value, the checking result of the receiver is obtained to be normal, otherwise, the checking result of the receiver is abnormal.
The SNR value at this time is estimated from SNR 2=snr1+ (P2-P1). If the SNR value is greater than or equal to the SNR2 value required by the system, the design meets the system design requirement in ACS. Snr=4.7+ (-41- (-99)) -6=56.7 dB is calculated, i.e. the design requirement with an SNR of 30dB is met.
The communication system receiver inspection device provided by the invention will be described below, and the communication system receiver inspection device described below and the communication system receiver inspection method described above can be referred to correspondingly to each other.
As shown in fig. 6, the apparatus comprises a determination module 601, a calculation module 602, and a verification module 603, wherein:
the determining module 601 is configured to determine gain noise of each active device in an analog receiving link of a receiver according to a working index of the receiver;
the calculation module 602 is configured to calculate a noise coefficient estimation value of the analog receiving link according to gain noise of each active device, and calculate a noise coefficient estimation value of the receiver according to the noise coefficient estimation value of the analog receiving link;
the checking module 603 is configured to calculate a difference between the noise figure estimated value and the noise figure design value of the receiver, compare the difference with a preset threshold, and obtain a checking result of the receiver according to a comparison result.
According to the embodiment, the gain noise of each active device in the analog receiving link of the receiver is determined according to the working index of the receiver, so that the total noise of the receiver system under no blocking can be ensured, and the reliability of the design of the analog receiving link is ensured; when the test is carried out, the test is only carried out on the analog part of the receiver, whether the noise coefficient of the analog receiving link meets the design requirement is estimated, the possible faults of the baseband part can be eliminated without entering the actual demodulation part, the test equipment is reduced, and the test is simple and efficient.
Fig. 7 illustrates a physical schematic diagram of an electronic device, as shown in fig. 7, which may include: processor 710, communication interface (Communications Interface) 720, memory 730, and communication bus 740, wherein processor 710, communication interface 720, memory 730 communicate with each other via communication bus 740. Processor 710 may invoke logic instructions in memory 730 to perform a communication system receiver verification method comprising: according to the working index of the receiver, determining the gain noise of each active device in an analog receiving link of the receiver; calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link; and calculating a difference value between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference value with a preset threshold value, and obtaining a detection result of the receiver according to a comparison result.
Further, the logic instructions in the memory 730 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of performing the communication system receiver checking method provided by the above methods, the method comprising: according to the working index of the receiver, determining the gain noise of each active device in an analog receiving link of the receiver; calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link; and calculating a difference value between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference value with a preset threshold value, and obtaining a detection result of the receiver according to a comparison result.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method of communication system receiver verification provided by the above methods, the method comprising: according to the working index of the receiver, determining the gain noise of each active device in an analog receiving link of the receiver; calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link; and calculating a difference value between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference value with a preset threshold value, and obtaining a detection result of the receiver according to a comparison result.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for inspecting a receiver of a communication system, comprising:
according to the working index of the receiver, determining the gain noise of each active device in an analog receiving link of the receiver;
calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device, and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link;
calculating a difference value between a noise coefficient estimated value and a noise coefficient design value of the receiver, comparing the difference value with a preset threshold value, and acquiring a detection result of the receiver according to a comparison result;
the working index comprises a preset noise coefficient of the analog receiving link, the maximum input useful signal power of the receiver and preset conditions met by the noise coefficient of the receiving signal of the analog receiving link;
the preset condition comprises that when the input signal intensity of the receiver is a first preset intensity value, the noise coefficient of the received signal is a first preset coefficient value; when the input signal strength increases from the first preset strength value to a second preset strength value, the received signal noise coefficient increases from the first preset coefficient value to a second preset coefficient value; when the input signal strength is greater than the second preset strength value, the received signal noise coefficient is greater than the second preset coefficient value;
the determining the gain noise of each active device in the analog receiving link of the receiver according to the working index of the receiver comprises the following steps:
determining the minimum gain and the maximum gain of the analog receiving link according to the working index of the receiver, and determining the first gain of the analog receiving link according to the minimum gain and the maximum gain;
calculating a second gain of the analog receive chain when the received signal of the receiver reaches an in-band maximum block;
taking the difference between the first gain and the second gain as gain noise of a gain attenuation device in the analog receiving link;
calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power;
and taking the difference value between the second gain and the third gain as gain noise of a first-stage amplifier in the analog receiving link, and bypassing a second-stage amplifier in the analog receiving link.
2. The method for checking a receiver in a communication system according to claim 1, wherein said determining a minimum gain and a maximum gain of said analog receiving link according to an operation index of the receiver comprises:
adding a preset contribution noise coefficient of an ADC of a receiver and a preset noise coefficient of the analog receiving link to obtain a noise coefficient design value of the receiver;
calculating the minimum gain of the analog receiving link according to the preset noise coefficient of the analog receiving link, the noise coefficient design value of the receiver and the preset equivalent noise coefficient of the ADC;
calculating the peak power of a signal input to the ADC when the ADC is full-scale according to the maximum receiving level of the ADC and the second preset coefficient value;
and calculating the maximum gain of the analog receiving link according to the in-band amplitude unevenness of the analog receiving link, the peak-to-average ratio of the receiving signal, the reserved margin, the minimum value of the dynamic range in the 3GPP Local and the signal peak power.
3. The communication system receiver verification method of claim 1, wherein said calculating a second gain of said analog receive chain when a received signal of said receiver reaches an in-band maximum blocking comprises:
calculating a second gain of the analog receiving link according to the preset in-band amplitude unevenness of the analog receiving link, the preset peak-to-average ratio of the received signal, the preset reserved margin, the in-band maximum blocking and the signal peak power;
and calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power, including:
and calculating a third gain of the analog receiving link according to the preset in-band amplitude unevenness of the analog receiving link, the preset peak-to-average ratio of the receiving signal, the preset reserved margin, the maximum input useful signal power and the signal peak power.
4. The method of claim 1, wherein said calculating a noise figure estimate of said analog receive chain based on gain noise of each active device, and calculating a noise figure estimate of said receiver based on said noise figure estimate of said analog receive chain, comprises:
calculating a noise coefficient estimated value of the analog receiving link under ACS according to the gain of the intermediate frequency part of the analog receiving link, the noise coefficient design value of the receiver, the gain noise of the gain attenuation device and the second preset coefficient value;
calculating a contribution noise coefficient estimation value of the ADC according to a preset equivalent noise coefficient of the ADC of the receiver and the second gain;
and adding the noise coefficient estimated value of the analog receiving link under ACS to the contribution noise coefficient estimated value of the ADC to obtain the noise coefficient estimated value of the receiver.
5. The method for checking a receiver in a communication system according to claim 4, wherein said obtaining the checking result of said receiver based on the comparison result comprises:
acquiring an estimated value of the second preset coefficient value according to the first preset coefficient value, a first preset intensity value, the in-band maximum obstruction and the preset threshold;
and if the difference value is smaller than the preset threshold value and the estimated value of the second preset coefficient value is larger than or equal to the second preset coefficient value, the checking result of the receiver is obtained to be normal, otherwise, the checking result of the receiver is abnormal.
6. A communication system receiver checking apparatus, comprising:
the determining module is used for determining gain noise of each active device in an analog receiving link of the receiver according to the working index of the receiver;
the calculation module is used for calculating a noise coefficient estimated value of the analog receiving link according to gain noise of each active device and calculating a noise coefficient estimated value of the receiver according to the noise coefficient estimated value of the analog receiving link;
the detection module is used for calculating the difference between the noise coefficient estimated value and the noise coefficient design value of the receiver, comparing the difference with a preset threshold value and obtaining the detection result of the receiver according to the comparison result;
the working index comprises a preset noise coefficient of the analog receiving link, the maximum input useful signal power of the receiver and preset conditions met by the noise coefficient of the receiving signal of the analog receiving link;
the preset condition comprises that when the input signal intensity of the receiver is a first preset intensity value, the noise coefficient of the received signal is a first preset coefficient value; when the input signal strength increases from the first preset strength value to a second preset strength value, the received signal noise coefficient increases from the first preset coefficient value to a second preset coefficient value; when the input signal strength is greater than the second preset strength value, the received signal noise coefficient is greater than the second preset coefficient value;
the determining module is specifically configured to:
determining the minimum gain and the maximum gain of the analog receiving link according to the working index of the receiver, and determining the first gain of the analog receiving link according to the minimum gain and the maximum gain;
calculating a second gain of the analog receive chain when the received signal of the receiver reaches an in-band maximum block;
taking the difference between the first gain and the second gain as gain noise of a gain attenuation device in the analog receiving link;
calculating a third gain of the analog receiving link when the received signal power of the receiver is the maximum input useful signal power;
and taking the difference value between the second gain and the third gain as gain noise of a first-stage amplifier in the analog receiving link, and bypassing a second-stage amplifier in the analog receiving link.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the communication system receiver verification method according to any one of claims 1 to 5 when the program is executed.
8. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the communication system receiver verification method according to any of claims 1 to 5.
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