CN1667984A - A method for implementing reversal volume test and equipment for generating analog input signal - Google Patents
A method for implementing reversal volume test and equipment for generating analog input signal Download PDFInfo
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- CN1667984A CN1667984A CNA200410006457XA CN200410006457A CN1667984A CN 1667984 A CN1667984 A CN 1667984A CN A200410006457X A CNA200410006457X A CN A200410006457XA CN 200410006457 A CN200410006457 A CN 200410006457A CN 1667984 A CN1667984 A CN 1667984A
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Abstract
This invention relates to a method for realizing reverse capacity test and a device generating analog input signals. Said method includes: A. Each current dialed mobile station sends signals to a system using power control. B. Said system converts signals received in the base bandwidth to signals with fixed signal strength and generates additional white gauss noise (AWGN) signals to be multiplied by factor K to be laminated with signals having fixed signal strength to obtain signals of the system simulating input power control. C The system using the power control judges if it is impossible to process the got signals, if so, it records the successful mobile station number dialed at present and takes the sum of 1 plus factor K to time the present successful mobile station number as the reverse capacity of the system using power control, otherwise, it adds the mobile stations sending signals to the system using the power-control dialed at present to return to step A.
Description
Technical field
The present invention relates to the technology of test capacity in the system of use power control, realize the method for reverse capacity test and the device of generation analog input signal in particularly a kind of system that uses power to control.
Background technology
For wireless system, the size of reverse capacity is to weigh an important factors of wireless system performance, and reverse capacity is exactly the maximum travelling carriage quantity that interior at one time this wireless system allows communication.Because using the system of power control is a self-interference system, as: cdma system, weigh its reverse capacity and just become difficult more.
With the cdma system is the reverse capacity how the example explanation weighs the system that uses power control.
At present, can measure the reverse capacity of cdma system, below these three kinds of methods be narrated respectively by three kinds of methods.
First method, the mode of directly carrying out testing with travelling carriage is at one time tested the reverse capacity of cdma system, promptly interior at one time by dialing a large amount of travelling carriages artificially, till this cdma system can not insert more travelling carriage again, statistics is dialed the quantity of the travelling carriage of success, thereby with the reverse capacity of the interior at one time maximum travelling carriage quantity that can support of this cdma system as this cdma system.
But owing to dial a large amount of travelling carriages in will be at one time, so it is big to measure the reverse capacity workload of cdma system in this way, operation is difficulty very.Further, because the intrinsic near-far interference of cdma system, the reverse capacity that measures in different places is also far from each other, in order to weigh the reverse capacity of this cdma system accurately, have to carry out the reverse capacity of this cdma system of the test different location of said method, so this method implements very difficult in different places.
Second method, obtain the reverse capacity of cdma system by the relation between the lifting of making an uproar at the bottom of comparison travelling carriage quantity and the cdma system, promptly in cdma system, dial travelling carriage in a large number, the definite value of lifting of making an uproar up to the end of cdma system is calculated the reverse capacity of this cdma system according to the quantity of dialing travelling carriage.
As shown in Equation (1):
ROT in the formula (1) represents the end of the cdma system lifting value of making an uproar, and L represents the ratio when the shared cdma system reverse capacity of preload.For example: make an uproar at the bottom of travelling carriage makes cdma system when promoting 3dB when dialing in a large number, when the ratio L of the shared cdma system reverse capacity of preload is 50%, then the reverse capacity of this cdma system is the current twice of dialing travelling carriage quantity.In order to test the cdma system reverse capacity accurately, must adopt this method repeatedly to test, the result who obtains final statistical is as the cdma system reverse capacity.
This method is first method relatively, has reduced the quantity of dialing travelling carriage, such as: can only dial the reverse capacity that half travelling carriage quantity of first method just can be measured cdma system.But, measure the reverse capacity of cdma system exactly in order to utilize this method, must measure the lifting that making an uproar in the end and makes an uproar in the end of cdma system exactly, yet, make an uproar in the end of cdma system and the measurement of the lifting of making an uproar in the end is very difficult, the variation of making an uproar in different location under the cdma system, the end is very large.Therefore, it is also very big to use this method to accurately measure the difficulty of reverse capacity of cdma system.Further, the lifting that a spot of travelling carriage is made an uproar at the bottom of dialing cdma system under cdma system is unconspicuous, the test travelling carriage must reach certain quantity, could measure the reverse capacity of cdma system exactly, thereby make the workload of the reverse capacity that utilizes this method to measure cdma system also very big.
The third method adopts the method for simulating to obtain the reverse capacity of cdma system under the situation that reduces the cdma system signal to noise ratio.
This method is based on carries out on the basis of analog intermediate frequency, set up a system that is used to test the cdma system reverse capacity, the signal of communication that this system is used for receiving obtains the signal of analog input cdma system and this signal is sent to cdma system receiving after reducing signal to noise ratio.As shown in Figure 1, Fig. 1 is the system's composition schematic diagram that is used to test the cdma system reverse capacity.Wherein, the signal of communication that this system receives a large amount of travelling carriages transmissions is input signal S1, and module 1 is gathered this input signal S1 and calculated the signal strength signal intensity of this signal in real time, and the signal strength signal intensity that calculates is input to module 2; Module 2 is used for producing additive white Gaussian noise (AWGN) signal according to the signal strength signal intensity of the input signal S1 that receives, and this AWGN signal times is doubly added up with input signal S1 the back with K, finally obtain output signal S2 and export, this output signal S2 is the signal that cdma system is arrived in analog input.
Signal to noise ratio snr 1 computing formula of input signal S1 is as shown in Equation (2):
Wherein, S represents the signal strength signal intensity of useful signal among the input signal S1, and promptly the wireless signal that has practical communication information in the unit bandwidth does not comprise noise; N represents the interior signal strength signal intensity that is received of the unit bandwidth of cdma system;
Signal to noise ratio snr 2 computing formula of output signal S2 are as shown in Equation (3):
The signal to noise ratio snr 1 of output signal S2 has reduced than the signal to noise ratio snr 2 of input signal S1
Doubly, be inversely proportional to because the reverse capacity of cdma system is a demodulation threshold with cdma system, demodulation threshold is that cdma system is realized the lowest signal-to-noise that demodulation reached, that is,
Through after Fig. 1 described processing, the real reverse capacity of cdma system is when Pretesting reverse capacity (1+K) times.Therefore, dial a large amount of travelling carriages by estimating K value and the same place under cdma system, till cdma system can not increase number of mobile stations again, being cdma system judges do not have ability to handle output signal S2 according to the disposal ability of its intermediate frequency and base band, and this output signal S2 is that the signal that the travelling carriage dialed sends is changed by the described mode of Fig. 1; Write down current number of mobile stations, then the reverse capacity of cdma system multiply by current number of mobile stations for (1+K).
Because the current number of dialing travelling carriage is actually the cdma system reverse capacity
Doubly, thus the number that this method is dialed travelling carriage than first method and second method all reduce significantly.But, measure the reverse capacity of cdma system exactly in order to adopt this method, must measure the signal strength signal intensity of the reverse input signal S1 of cdma system in real time, because the signal strength signal intensity of input signal S1 can change, the AWGN signal that makes input is also along with variation, so will cause the difficulty of the system that designs this test cdma system reverse capacity constantly according to the different AWGN signal of signal strength signal intensity generation of the input signal S1 that changes.
Summary of the invention
In view of this, main purpose of the present invention is to provide on the one hand a kind of method of reverse capacity test, and this method can simply easily realize using the reverse capacity test of the system of power control.
The present invention provides a kind of device that produces analog input signal on the other hand, and this device sends the system that uses power control to as analog input signal after the signal that receives can being reduced signal to noise ratio.
According to above-mentioned purpose, specific embodiments of the present invention is to determine like this:
A kind of method that realizes the reverse capacity test is provided with COEFFICIENT K, and this method comprises:
A, current each travelling carriage of dialing are given and are used the system of power control to send signal;
B, the system that uses power to control are the signal with fixed signal intensity with the conversion of signals that receives in the baseband bandwidth, and according to this fixed signal intensity generation additive white Gaussian noise AWGN signal, then the AWGN signal times that produced is superposeed with the signal with fixed signal intensity after with COEFFICIENT K, obtain the signal that the system of power control is used in analog input;
C, the system that uses power to control judge whether to handle the signal that the system of power control is used in the analog input that obtains, if, write down the current number of mobile stations of dialing success, and add the COEFFICIENT K sum with 1 and multiply by the reverse capacity of the current number of mobile stations of dialing success again as the system that uses power control; Otherwise, increase the travelling carriage that the current system to using power control that dials sends signal, return steps A.
Described COEFFICIENT K+1 is the system reverse capacity of the current use power control of estimation and the ratio of current spendable number of mobile stations.
Step B is described to be that the process with signal of fixed signal intensity is with each conversion of signals that receives: the signal that receives is carried out obtaining intermediate-freuqncy signal after the filtering, again resulting intermediate-freuqncy signal is carried out analog-to-digital conversion and obtain digital signal, the signal that obtains having fixed signal intensity after this digital signal process automatic gain adjustment.
Step C is described, and to judge whether to handle the analog input signal that obtains be according to the disposal ability decision of the intermediate frequency of the system of current use power control and base band.
This method further comprises:
Repeat once above steps A～step D, record uses the reverse capacity of the system of power control each time, calculate the mean value of the system reverse capacity of resulting all use power controls, and with the reverse capacity of this mean value as the system of current use power control.
This method further comprises:
Different COEFFICIENT K is set, to each COEFFICIENT K execution in step A～step D, write down the reverse capacity of the system of the use power control that different COEFFICIENT K obtain, and calculate resulting all use the mean value of the system reverse capacity of power control, this mean value is made the reverse capacity of the system of power control as this.
The described system of power control that uses is code division multiple access system, CDMA 2000 system or broadband CDMA system.
A kind of device that produces analog input signal, this device comprises:
Filter is used for carrying out to the received signal filtering, and sends the intermediate-freuqncy signal that obtains after the filtering to A/D converter;
A/D converter, the intermediate-freuqncy signal that is used for receiving is converted to digital signal, and sends the digital Auto Gain controller to;
The digital Auto Gain controller, the digital signal that is used for receiving is fixed the signal of signal strength signal intensity by gain transformations, and sends computing module to;
The AWGN signal generator module is used for producing the AWGN signal according to fixed signal intensity, and sends computing module to;
Computing module is used for the signal that the AWGN signal and the signal of fixed signal intensity according to input obtain the system of the current use power control of analog input.
Described computing module further comprises multiplier and accumulator, and multiplier receives the signal and the COEFFICIENT K of AWGN signal generator module input, and the input of accumulator connects the output of digital automatic gain controller and the output of multiplier simultaneously.
Described COEFFICIENT K+1 is the system reverse capacity of the current use power control of estimation and the ratio of current spendable number of mobile stations.
From such scheme as can be seen, the present invention adopts digital form to realize using with less mobile station testing the reverse capacity of the system of power control by reducing the system signal noise ratio that uses power control, owing to be fixed the S1 ' of signal strength signal intensity after the conversion that the device of generation analog input signal provided by the invention adopts digital Auto Gain controller (D-AGC) that input signal S1 is gained, and the signal strength signal intensity according to the S1 ' of fixed signal intensity produces the AWGN signal, thereby the AWGN signal can not change according to the variation of input signal S1, can not cause the Design of device difficulty and the complexity of the system reverse capacity of this use power control of test.Therefore, device provided by the invention sends the system that uses power control to as analog input signal after the signal that receives can being reduced signal to noise ratio, and method provided by the invention can simply be easy to the reverse capacity test that the system of power control is used in realization.
Description of drawings
Fig. 1 is the system's composition schematic diagram that is used to test the cdma system reverse capacity.
Fig. 2 produces the device schematic diagram of analog input signal for the present invention.
Fig. 3 realizes testing the method flow diagram of the reverse capacity of cdma system for the present invention.
Embodiment
The present invention is the method for example explanation test reverse capacity and the device that produces analog input signal with the cdma system.
The present invention is based on and carries out on the basis of digital intermediate frequency, promptly recently reduces to be input to the signal to noise ratio of cdma system baseband portion by the noise that reduces the cdma system intermediate-frequency section, reaches the purpose of simulated inverse load.
As shown in Figure 2, Fig. 2 produces the device schematic diagram of analog input signal for the present invention, promptly set up a device that is used to test the cdma system reverse capacity, obtain the signal of analog input cdma system after the signal of communication reduction signal to noise ratio that this device is used for receiving, and the signal of resulting analog input cdma system is sent to the cdma system reception.
This device comprises filter, mould/number (A/D) transducer, D-AGC, AWGN signal generator module and computing module, and wherein, computing module further comprises multiplier and accumulator again.This device at first carries out filtering by filter to this input signal S1 after receiving the input signal S1 of travelling carriage transmission, obtains the signal of intermediate-frequency section; Then the signal that obtains after the filtering is converted to digital signal by A/D converter; Digital signal is converted to the signal S1 ' with fixed signal intensity by D-AGC, and this fixed signal intensity is in advance in design during this device, and is definite according to the intermediate frequency of current C DMA system and Base-Band Processing ability; Simultaneously, the AWGN signal generator module produces the AWGN signal according to determined fixed signal intensity; Afterwards, with the AWGN signal that produced by the multiplier in the computing module multiply by K doubly after, in accumulator, superpose again with signal S1 ', obtain output signal S2, this output signal S2 is the signal of analog input to cdma system.
Because the present invention has used D-AGC, this D-AGC is used to adjust the gain of the digital signal S1 of input, obtain having the S1 ' of definite fixed signal intensity, the S1 ' of this fixed signal intensity does not change with the variation of digital signal S1, but a changeless value.And, the AWGN signal is to produce according to the signal strength signal intensity of signal S1 ', promptly produce according to the fixed signal intensity of signal S1 ', so when the signal strength signal intensity of input signal S1 changes, AWGN signal strength signal intensity of the present invention can not change thereupon, and just produces according to determined fixed signal intensity.
Signal to noise ratio snr 1 computing formula of input signal S1 is as shown in Equation (4):
Wherein, S represents the intensity of useful signal among the input signal S1, and N represents the interior signal strength signal intensity that is received of the unit bandwidth of cdma system; Suppose that from input signal S1 to signal S1 ' to the α that changes into of signal to noise ratio, the signal to noise ratio of signal S1 ' is so
Because α determines according to the disposal ability of the intermediate frequency of cdma system and base band, so certain specific cdma system is fixed, promptly the change of signal to noise ratio is fixed to signal S1 ' from input signal S1.
Signal to noise ratio snr 2 computing formula of output signal S2 are as shown in Equation (5):
The signal to noise ratio snr 2 of output signal S2 has reduced than the signal to noise ratio snr 1 of input signal S1
Doubly.Because determined fixed value when α is this device of design, that is to say, if in input signal S1, do not add K AWGN signal doubly, the signal to noise ratio snr 1 of input signal S1 is specific output signal S2 signal to noise ratio snr 1 rising α also, and the reverse capacity of cdma system is that the demodulation threshold with cdma system is inversely proportional to, so through after Fig. 2 described processing, the reverse capacity of cdma system is when Pretesting reverse capacity (1+K) times.
Therefore, the relation between the test reverse capacity TEST-LIMIT-USERS of the reverse capacity LIMIT-USERS of cdma system of the present invention and cdma system is as shown in Equation (6):
LIMIT_USERS＝(1+K)×TEST_LIMIT_USERS (6)
Be test reverse capacity TEST-LIMIT-USERS that the reverse capacity LIMIT-USERS of cdma system equals cdma system multiply by 1 with the K sum.
According to formula (6), just can adopt and dial less travelling carriage and simulate the reverse capacity of dialing a large amount of mobile station testing cdma systems by the K value is set.
As shown in Figure 3, Fig. 3 realizes testing the method flow diagram of the reverse capacity of cdma system for the present invention, reverse capacity LIMIT-USERS according to the cdma system of the number of mobile stations M of current use and estimation is provided with rational K+1 value in advance, reverse capacity LIMIT-USERS that this K+1 value is a cdma system and the ratio of number of mobile stations M, its concrete steps comprise:
Step 300, selected testing location, ceaselessly add the number of dialing travelling carriage, up to this cdma system again till the communication of supports mobile, when to be cdma system according to the disposal ability of its intermediate frequency and base band judge that ability is not handled certain output signal S2, write down the current number of having dialed the travelling carriage of success, wherein, output signal S2 is that the signal that the travelling carriage dialed sends adopts the described device of Fig. 2 of the present invention to produce;
Step 301, repeated execution of steps 300 repeatedly, the mean value of the current number of mobile stations of having dialed success of getting repeatedly test is as TEST-LIMIT-USERS;
Step 302, the TEST-LIMIT-USERS value that obtains according to predefined K value and step 301 calculate the reverse capacity of this cdma system by formula (6).
The present invention can also be provided with different K values according to the reverse capacity LIMIT-USERS of the cdma system of the number of mobile stations M of current use and estimation, execution graph 3 described steps then, the mean value of reverse capacity of finally getting this cdma system that repeatedly calculates is as the reverse capacity of this cdma system.
Because the present invention adopts digital form recently to realize reverse capacity with less mobile station testing cdma system by reducing noise, thus adopt the system design of test cdma system reverse capacity of method design provided by the invention simple, realization easily.Thereby method provided by the invention is measured the reverse capacity of cdma system with less travelling carriage.
Can use the system of power control with method provided by the invention and the system that produces the device to test reverse capacity of analog input signal, as: cdma system, CDMA2000 system or Wideband Code Division Multiple Access (WCDMA) (WCDMA) system.
The above only is preferred embodiment of the present invention, and in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention and be equal to replacement etc. all should not be included within protection scope of the present invention.
Claims (10)
1, a kind of method that realizes the reverse capacity test is characterized in that COEFFICIENT K is set, and this method comprises:
A, current each travelling carriage of dialing are given and are used the system of power control to send signal;
B, the system that uses power to control are the signal with fixed signal intensity with the conversion of signals that receives in the baseband bandwidth, and according to this fixed signal intensity generation additive white Gaussian noise AWGN signal, then the AWGN signal times that produced is superposeed with the signal with fixed signal intensity after with COEFFICIENT K, obtain the signal that the system of power control is used in analog input;
C, the system that uses power to control judge whether to handle the signal that the system of power control is used in the analog input that obtains, if, write down the current number of mobile stations of dialing success, and add the COEFFICIENT K sum with 1 and multiply by the reverse capacity of the current number of mobile stations of dialing success again as the system that uses power control; Otherwise, increase the travelling carriage that the current system to using power control that dials sends signal, return steps A.
2, the method for claim 1 is characterized in that, described COEFFICIENT K+1 is the system reverse capacity of the current use power control of estimation and the ratio of current spendable number of mobile stations.
3, the method for claim 1, it is characterized in that, step B is described to be that the process with signal of fixed signal intensity is with each conversion of signals that receives: the signal that receives is carried out obtaining intermediate-freuqncy signal after the filtering, again resulting intermediate-freuqncy signal is carried out analog-to-digital conversion and obtain digital signal, the signal that obtains having fixed signal intensity after this digital signal process automatic gain adjustment.
4, the method for claim 1 is characterized in that, step C is described, and to judge whether to handle the analog input signal that obtains be according to the disposal ability decision of the intermediate frequency of the system of current use power control and base band.
5, the method for claim 1 is characterized in that, this method further comprises:
Repeat once above steps A～step D, record uses the reverse capacity of the system of power control each time, calculate the mean value of the system reverse capacity of resulting all use power controls, and with the reverse capacity of this mean value as the system of current use power control.
6, the method for claim 1 is characterized in that, this method further comprises:
Different COEFFICIENT K is set, to each COEFFICIENT K execution in step A～step D, write down the reverse capacity of the system of the use power control that different COEFFICIENT K obtain, and calculate resulting all use the mean value of the system reverse capacity of power control, this mean value is made the reverse capacity of the system of power control as this.
7, the method for claim 1 is characterized in that, the described system of power control that uses is code division multiple access system, CDMA 2000 system or broadband CDMA system.
8, a kind of device that produces analog input signal is characterized in that, this device comprises:
Filter is used for carrying out to the received signal filtering, and sends the intermediate-freuqncy signal that obtains after the filtering to A/D converter;
A/D converter, the intermediate-freuqncy signal that is used for receiving is converted to digital signal, and sends the digital Auto Gain controller to;
The digital Auto Gain controller, the digital signal that is used for receiving is fixed the signal of signal strength signal intensity by gain transformations, and sends computing module to;
The AWGN signal generator module is used for producing the AWGN signal according to fixed signal intensity, and sends computing module to;
Computing module is used for the signal that the AWGN signal and the signal of fixed signal intensity according to input obtain the system of the current use power control of analog input.
9, device as claimed in claim 8, it is characterized in that, described computing module further comprises multiplier and accumulator, and multiplier receives the signal and the COEFFICIENT K of AWGN signal generator module input, and the input of accumulator connects the output of digital automatic gain controller and the output of multiplier simultaneously.
10, device as claimed in claim 9, described COEFFICIENT K+1 is the system reverse capacity of the current use power control of estimation and the ratio of current spendable number of mobile stations.
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| CNB200410006457XA CN100558016C (en) | 2004-03-08 | 2004-03-08 | A kind of device of realizing the method for reverse capacity test and producing analog input signal |
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| CNB200410006457XA CN100558016C (en) | 2004-03-08 | 2004-03-08 | A kind of device of realizing the method for reverse capacity test and producing analog input signal |
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| CN114499710A (en) * | 2022-04-02 | 2022-05-13 | 成都爱瑞无线科技有限公司 | Background noise change measuring method, background noise change measuring device, background noise change measuring system, electronic device, and storage medium |
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| CN114499710A (en) * | 2022-04-02 | 2022-05-13 | 成都爱瑞无线科技有限公司 | Background noise change measuring method, background noise change measuring device, background noise change measuring system, electronic device, and storage medium |
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