CN2531593Y - GSM mobile communication test box - Google Patents
GSM mobile communication test box Download PDFInfo
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- CN2531593Y CN2531593Y CN01273405U CN01273405U CN2531593Y CN 2531593 Y CN2531593 Y CN 2531593Y CN 01273405 U CN01273405 U CN 01273405U CN 01273405 U CN01273405 U CN 01273405U CN 2531593 Y CN2531593 Y CN 2531593Y
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Abstract
The utility model provides a GSM moving communication experimental box, including a radio frequency unit, a spectrum analysis card, a base band unit and a central control unit, which realizes the GSM900/1800 MHz wireless interface protocol of the ETSI and part function of a simulate base station. The utility model can finish principle teaching experiments, such as digital signal orthogonal modulation and demodulation, GMSK modulation and demodulation, channel coding and decoding, interleave and de-interleave, frequency division duplex tdma, high frequency signal modulation and demodulation and mobile phone emission power spectrum test, etc. and system level teaching experiments, such as mobile phone access, mobile phone call and called, etc.
Description
One, technical field
The utility model is a GSM mobile communication experimental box, belongs to the experimental provision of mobile communication teaching.Use this experimental box, can finish a series of experiments in the mobile communication teaching.
Two, background technology
Along with the proposition of the strategy of prospering the nation with science and education and with the gsm wireless mobile communication system is that the mobile communication industry of representative obtains fast development in China, each universities and colleges' relevant speciality and each professional training course have extensively offered the course of " mobile communication " for this reason, meanwhile, the mobile communication teaching experimental equipment relevant with this subject but is blank, the shortage of teaching experimental equipment makes that vast study personnel are difficult to the mobile communication knowledge of being learned is had deeper understanding and cognition.
The purpose of this utility model is intended to fill up the blank of " mobile communication " teaching experimental equipment aspect, a kind of experimental box that matches with the mobile communication teaching is provided, utilize modern electronic technology, realize the Radio interface protocols of the GSM900/1800MHz of ETSI (ETSI), realize GSM anolog base station function, thereby can finish the multinomial experiment in the mobile communication teaching.
Three, summary of the invention
The utility model provides a GSM mobile communication experimental box, can finish interweaving and functional experiments such as deinterleaving, high-frequency signal carrier wave take place, high-frequency signal amplifies, high-frequency gain control and high-frequency signal amplification of digital signal modulation in the mobile communication teaching and demodulation, GMSK modulation and demodulation, chnnel coding and decoding, burst data flow; Can realize the function of anolog base station, finish the communication contact between experimental box and the mobile phone, finish that mobile phone networks, the mobile phone master exhales and mobile phone such as is exhaled at system-level experiment.
The technical solution of the utility model is: radio frequency unit is connected with common antenna, spectral analysis unit, Base Band Unit respectively; Base Band Unit is connected with central control unit with radio frequency unit respectively; Central control unit is connected with man-machine interface unit, Base Band Unit and spectral analysis unit respectively; Spectral analysis unit is connected with man-machine interface unit, central control unit and radio frequency unit respectively.Radio frequency unit is realized transmission-receiving function with the family chip group of high integration, and it transmits and receives part and all adopts pll frequency synthesizer, has guaranteed the accuracy and the stability of signal frequency.The man-machine interface unit adopts the high-speed dsp chip to realize showing and quickens, and has realized the control of screen display and carry out two-way data communication with serial mode and central control unit with high-speed microprocessor.Base Band Unit adopts special chip to realize the GMSK modulation and demodulation, and adopts the high-speed dsp chip to realize the channel coding/decoding of GSM mobile handset signal and interweave, and the Frequency Division Duplexing (FDD) time division multiple access forms frame and the time slot of TDMA with serial mode.The spectrum measurement card adopts high-speed floating point dsp chip and FPGA and realizes spectrum analysis to the mobile phone transmitting power in conjunction with fast fourier transformation algorithm.
Advantage of the present utility model is as described below:
The central control module of experimental box has been realized the network layer and the data link layer protocol of the GSM900/1800MHz Radio interface protocols of ETSI, the baseband transmission module has realized the physical layer protocol of GSM900/1800MHz Radio interface protocols, can finish the digital signal modulation experiment in the mobile communication teaching, GMSK (Gaussian-filtered minimum shift keying) modulation experiment, the channel coding/decoding experiment (comprises linear block codes, the encoding and decoding experiment of convolution code), the de-interleaving of burst data flow interweave the experiment etc., by matching, can observe the orthogonal simulation signal of digital signal after modulation with auxiliary equipment such as oscilloscope and logic analyzers, the formation of the burst sequence behind the channel coding, the de-interleaving of burst sequence a series of waveforms such as interweave.
The radio-frequency module of experimental box has adopted pll frequency synthesizer, realized low frequency orthogonal simulation signal is modulated to the radiofrequency signal of 900MHz, can finish experiments such as high-frequency signal carrier wave generation in the mobile communication teaching, high-frequency signal amplification, high-frequency gain control, high frequency modulated, high-frequency signal emission, by matching, can observe the various types of signal waveform in each process of high frequency modulated with auxiliary equipment such as oscilloscope and logic analyzers.
Experimental box is by the cooperation of each module and special SIM card, realized the function of anolog base station, can finish that mobile phone networks, the mobile phone master exhales and mobile phone such as is exhaled at system-level experiment, by the GSM signal of emission by the experimental box generation, can set up the communication contact between experimental box and the mobile phone, and the frequency spectrum card in the case provides the spectral characteristic of mobile phone transmitting power by experiment.
Experimental box is cheap for manufacturing cost, is easy to apply on a large scale.
Finish every experiment of mobile communication teaching by using this experimental box, can greatly enrich teaching means, improve the quality of teaching, simultaneously can make the student that the content of courses is had strong perceptual knowledge, to improving numerous students' experiment manipulative ability, realize the purpose of quality-oriented education, huge impetus is arranged.
Four, description of drawings
Fig. 1 GSM experimental box technical scheme block diagram
Fig. 2 radio frequency unit receiving unit block diagram, frame of broken lines partly belongs to radio frequency unit
Fig. 3 radio frequency unit radiating portion block diagram, frame of broken lines partly belongs to radio frequency unit
Fig. 4 spectrum analysis part block diagram
Fig. 5 is in Base Band Unit work block diagram when receiving, and is the DSP internal structure in the frame of broken lines
Base Band Unit work block diagram was the DSP internal structure in the frame of broken lines when Fig. 6 was in emission
Fig. 7 radio frequency unit circuit diagram
Fig. 8 spectral analysis unit circuit diagram
Fig. 9 Base Band Unit schematic diagram
Five, specific embodiments radio frequency unit
With reference to Fig. 2, Fig. 3 and Fig. 7, the radio frequency unit receiving unit is to be electrically connected with 1 pin of controllable attenuator U8 by capacitor C 48,8 pin of U8 link to each other with C74, the other end of C74 links to each other with 7 pin of frequency mixer U7,2 pin of U7 link to each other with 6 pin that local oscillator is amplified U6,5 pin of U7 link to each other with low pass filter, 3 pin that local oscillator is amplified U6 link to each other with the L13 inductive coupler, 11 pin of local oscillator U5 link to each other with the L13 other end, intermediate frequency amplifies U9 one end and links to each other with low pass filter, the other end amplifies U10 with intermediate frequency and links to each other, intermediate frequency amplification U10 exports an end and links to each other with spectral analysis unit by the IF_OUT interface through R18 C72, exporting another path of end R17 C68 links to each other with 16 pin of logarithmic amplifier and amplitude limit unit U11,8 pin of U11 link to each other with 15 pin of U12 by R22C63,17 of U12,18 pin link to each other with the A/D converting unit, the radio frequency unit radiating portion is linked to each other with 5 pin of a uneven balanced to unbalanced transformer T1 by L3 C16 by 11 pin of U1 programmable frequency synthesizer U1,2 of quadrature modulation unit U4,1 links to each other 5 of U4 respectively with 16 pin with J1,6 pin pass through C17, C18 respectively with 3 of T1,1 pin links to each other.
Each functional block specification of radio frequency unit receiving unit is as follows: controllable attenuator U8:
Received signal is coupled to 1 pin of U8 from RX_IN through capacitor C 48, exports from 8 pin behind U8.U8 is a kind of device that can do differential declines according to the difference of control voltage to input signal.Control end is 3 pin, and control voltage is provided by the BU8 of baseband portion.Local oscillator U5:
Local oscillator is a phase-locked loop, by CPU output frequency is set according to communication channel.Local oscillator is amplified U6:
Local oscillation signal arrives 3 pin of amplifier tube U6 through inductive coupler from 11 pin of U5.Because frequency mixer needs powerful local oscillation signal, after amplifying, U6 exports frequency mixer to from 6 pin.Frequency mixer U7:
Local oscillation signal (from the input of 2 pin) and radiofrequency signal (from the input of 7 pin) are exported from 5 pin after the mixing in U7.The frequency content of no local oscillator and signal in the mixing output spectrum of frequency mixer U7, and the combination frequency composition is seldom.In the GSM experimental box, mixing output local oscillation signal first harmonic and signal first harmonic obtain very pure intermediate frequency component through low pass filter.Low pass filter:
The signal of frequency mixer output takes out intermediate-freuqncy signal behind low pass filter.Intermediate frequency amplifies U9, U10:
Be divided into two-way after the intermediate-freuqncy signal after the low-pass filtering is put in two-stage: one tunnel (IF_OUT interface) goes spectral analysis unit, observes the spectrum component of received signal, so that can know the quality of received signal; Logarithmic amplifier is removed on another road.Logarithmic amplifier and amplitude limit unit U11:
Produce the magnitude of voltage that is directly proportional with received signal intensity through logarithmic amplifier from the intermediate-freuqncy signal of 16 pin output on the one hand among U11, magnitude of voltage can be known the power of signal thus; This signal is as the timing signal of spectrum unit simultaneously.On the other hand, intermediate-freuqncy signal is gone to the quadrature demodulation unit through the amplitude limit amplification from the output of 8 pin.Quadrature demodulation unit U12:
Through the quadrature demodulation unit, produce the inphase quadrature baseband signal of simulation from the intermediate-freuqncy signal of 15 pin inputs, go the A/D converting unit from 17 pin and the output of 18 pin.
Now radio frequency unit radiating portion functional unit is described as follows (with reference to base band and central control circuit schematic diagram):
Channel code and burst formation unit B U1 and GMSK modulating unit BU8 are referring to the introduction of Base Band Unit.Carrier wave forms unit U1:
U1 is the programmable frequency synthesizer, according to the control signal (mainly be data, data are relevant with communication channel) of CPU.U1 exports corresponding carrier wave from 11 pin.Controllable attenuator U3:
Controllable attenuator U3 decays to transmitting.Its control signal is from 35 pin of baseband portion BU8, and the control attenuation is to judge that according to the intensity of received signal travelling carriage is next fixed apart from the distance of base station, and it is little or unattenuated far then to decay, and closely then decay is big, to reduce radiated interference.Imbalance-balanced to unbalanced transformer T1:
The quadrature modulation unit requires the carrier difference input.Therefore the carrier wave of phase-locked loop U1 generation must just can meet the requirements through the T1 conversion.Quadrature modulation unit U4:
Quadrature modulation unit U4 will be modulated to from the differential baseband signal of 2,1 and 16 pin input from the carrier wave of 5 pin and the input of 6 pin, and modulation system is a quadrature modulation.Final signal is exported from 11 pin, as transmitting.Spectral analysis unit:
With reference to Fig. 4 and Fig. 8, spectral analysis unit is linked to each other with PU8 by PJ, the PU8 amplifier links to each other with the NINA end of A/D converter PU4 by PR2,32 pin that PU2 interrupts formation sheet option code link to each other with 2 pin of PU7A, 4 pin link to each other with the VLOG end of U11, PU1, PU3 are dsp chip, link to each other with PU2 and demonstration respectively, and PU5, PU6 level translator link to each other with PU4, PU1 respectively.
Why will do the spectrum analysis part in the GSM experimental box, be the regulation of considering in the gsm wireless interface protocol monkey chatter.By observing the power spectrum quality of a mobile station signal quality as can be seen, thereby judge whether travelling carriage breaks down.
Its operation principle following (with reference to radio frequency and spectrum analysis partial circuit schematic diagram):
Received signal obtains intermediate-freuqncy signal through low pass filter after down-conversion, link the PJ place by IF_OUT by radio frequency line, as the main body of spectrum analysis.This signal is sent into A/D converter PU4 (from the 24 pin input of PU4) then through 3 grades of amplifications (U9 of radio frequency part, the PU8 of U10 and spectrum analysis part).Behind the intermediate-freuqncy signal process logarithmic amplifier U11 (radio frequency part), from output of 6 pin and the proportional impulse wave of signal magnitude of U11, pulse duration is 577us (time slot width) simultaneously, and the pulse spacing is 4.615ms (frame length).This signal arrives 4 pin (PWR) of the comparator PU7A of spectrum analysis part, after the PU7A shaping, imports the interrupt request singal that arrives as burst from 32 pin of PU2.After PU1 receives interrupt requests, send out chip selection signal to A/D converter.Chip selection signal produces clock and gives A/D converter after PU2 decoding, and A/D converter is promptly exported the data that sampling quantizes.These data are sampled datas of burst.Data arrive DSP through PU5 after the PU6 level conversion.In DSP, carry out FFT and calculate, obtain power spectrum, again to power spectrum carry out level and smooth and average after, export display unit to from 117 pin.Base Band Unit:
Referring to Fig. 9 by GMSK demodulation and channel-decoding unit B UI (dsp chip), respectively with the BU2 memory, BU3 program bit load registers, BU10BU11 and BU6 are level translator, BU8 is that the GMSK modulation forms the unit with the I|Q signal differential, links to each other with BU12 and BU10 respectively.
The core BU1 of Base Band Unit is the high-speed dsp chip of TI company.Base Band Unit is in the operation principle of accepting state: because gsm system is the work of TDMA mode, so reception and radiating portion are not in running order always.Whether it works the receiving unit of BU8 by 27,24 foot control systems.When needs received, low level signal of BU1 output this moment was given this two pins, starts the automatic reception operation.GMSK separates mediation channel-decoding unit B U1:
In the GSM experimental box, GMSK separates the mediation channel-decoding and is all finished by software in BU1.The minimum system of BU1 (DSP) is made up of BU2 and BU3.Wherein BU2 is 16 random asccess memory; BU3 is the program bit load registers.It also has some peripheral additional devices: as BU10, and BU11 and the BU6 effect of changing of flatting turn that all electrifies, BU1 need communicate by letter with CPU CU1 with BU8.
When being finished the A/D conversion by BU8 after, the signal that receives, exports receiving data frames synchronizing signal and data clock signal from 20,21 pin respectively simultaneously from 18 pin output digital datas stream.These three kinds of signals arrive 45,43 and 41 pin of DSP respectively after level conversion.Data serial input DSP under the effect of frame synchronization and clock signal.After CPU is received the total data of a burst, carry out the GMSK demodulation, channel-decoding (comprising deinterleaving, deconvolution etc.) recovers initial data.CPU control HPI (host interface) carries out level conversion with data through BU6 subsequently, passes to CPU.Operation principle when Base Band Unit is in emission state: channel code and burst form BU1:
In the GSM experimental box, chnnel coding interweaves, and mapping and burst form all to be finished by software in BU1.When being in emission state, the CPU of DSP carries out chnnel coding according to the instruction (data that comprise instruction and emission) of central control unit with corresponding initial data.As send synchronically controlling information, then with original bit behind parity code and convolution coding, add training sequence and tail bit, form the synchronization burst sequence.Form in burst under the effect of control, send the data to BU8 at assigned timeslot and carry out the GMSK modulation.GMSK modulating unit BU8:
During emission, under the control of central control unit, send control signal by DSP (BU1) and make the radiating portion of BU8 in running order.Emission data through coding enter BU8 through 2 pin, carry out the GMSK modulation in BU8, form I, and Q signal is exported from 41 and 39 pin.I, the Q signal difference forms BU12:
By the Simulation with I that BU8 forms, Q signal forms I behind BU12, and Q signal removes quadrature unit B U12.Central control unit
Central control unit is used to finish exchanges data and control with Base Band Unit, man-machine interface unit and radio frequency unit by serving as the main Single Chip Microcomputer (SCM) system of forming with CU1 (89C55).The position of also realizing anolog base station is in addition upgraded, the travelling carriage master exhales, main all flow processs of exhaling etc. in base station.
Claims (4)
1, GSM mobile communication experimental box, it is characterized in that the radio frequency unit that is electrically connected with common antenna, spectrum analysis card, Base Band Unit by respectively, the Base Band Unit that is electrically connected with radio frequency unit and central control unit, the central control unit that is electrically connected with man-machine interface unit, Base Band Unit and spectrum analysis card, the spectrum analysis card that is connected with man-machine interface unit, central control unit and radio frequency unit is formed.
2, the described mobile communication experimental box of claim 1, it is characterized in that the radio frequency unit receiving unit is to be electrically connected with 1 pin of controllable attenuator U8 by capacitor C 48,8 pin of U8 link to each other with C74, the other end of C74 links to each other with 7 pin of frequency mixer U7,2 pin of U7 link to each other with 6 pin that local oscillator is amplified U6,5 pin of U7 link to each other with low pass filter, 3 pin that local oscillator is amplified U6 link to each other with the L13 inductive coupler, 11 pin of local oscillator U5 link to each other with the L13 other end, intermediate frequency amplifies U9 one end and links to each other with low pass filter, the other end amplifies U10 with intermediate frequency and links to each other, intermediate frequency amplification U10 exports an end and links to each other with spectral analysis unit by the IF_OUT interface through R18 C72, exporting another path of end R17C68 links to each other with 16 pin of logarithmic amplifier and amplitude limit unit U11,8 pin of U11 link to each other with 15 pin of U12 by R22 C63,17 of U12,18 pin link to each other with the A/D converting unit, the radio frequency unit radiating portion passes through L3 by 11 pin of U1 programmable frequency synthesizer U1, C16 is with uneven---and 5 pin of balanced to unbalanced transformer T1 link to each other, 2 of quadrature modulation unit U4,1 links to each other 5 of U4 respectively with 16 pin with J1,6 pin pass through C17, C18 respectively with 3 of T1,1 pin links to each other.
3, the described mobile communication experimental box of claim 1, it is characterized in that spectral analysis unit is linked to each other with PU8 by PJ, the PU8 amplifier links to each other with 24 pin of A/D converter PU4 by PR2,32 pin that PU2 interrupts formation sheet option code link to each other with 2 pin of PU7A, 4 pin link to each other with 6 pin of the U11 of radio frequency unit, PU1 is a dsp chip, links to each other with PU2 and demonstration respectively, and PU5, PU6 level translator link to each other with PU4, PU1 respectively.
4, the described mobile communication experimental box of claim 1, it is characterized in that Base Band Unit is by GMSK demodulation and channel-decoding unit B U1 (dsp chip), respectively with the BU2 memory, BU3 program bit load registers, BU10, BU11 and BU6 are level translator, BU8 is GMSK modulation and I, Q signal differential formation unit, links to each other with BU12 and BU10 respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN01273405U CN2531593Y (en) | 2001-12-17 | 2001-12-17 | GSM mobile communication test box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN01273405U CN2531593Y (en) | 2001-12-17 | 2001-12-17 | GSM mobile communication test box |
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| CN01273405U Expired - Lifetime CN2531593Y (en) | 2001-12-17 | 2001-12-17 | GSM mobile communication test box |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401693C (en) * | 2005-07-29 | 2008-07-09 | 中兴通讯股份有限公司 | Performance detecting device and its method for radio network controller |
| CN103957437A (en) * | 2014-04-26 | 2014-07-30 | 吉安英佳电子科技有限公司 | Wireless servo portable high-integration digital multimedia all-in-one machine |
| CN104184490A (en) * | 2014-09-13 | 2014-12-03 | 中国电子科技集团公司第四十一研究所 | FDD-LTE terminal signal transmitting device |
| CN105227510A (en) * | 2015-11-09 | 2016-01-06 | 天津七一二通信广播有限公司 | A kind of new GMSK decoding circuit and coding/decoding method |
| CN106297487A (en) * | 2016-09-18 | 2017-01-04 | 肇庆市高新区创客科技有限公司 | A kind of mobile communication instructional terminal device merging variform |
| CN108418611A (en) * | 2018-03-08 | 2018-08-17 | 成都坤恒顺维科技股份有限公司 | A kind of extensive Multiinputoutput wireless channel simulation instrument |
| CN108535540A (en) * | 2018-05-08 | 2018-09-14 | 成都信息工程大学 | A kind of method of magnetron radar transmitter frequency transient measurement |
| CN109523843A (en) * | 2018-11-16 | 2019-03-26 | 内蒙古师范大学 | A kind of experimental box with spectrum analysis function |
-
2001
- 2001-12-17 CN CN01273405U patent/CN2531593Y/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401693C (en) * | 2005-07-29 | 2008-07-09 | 中兴通讯股份有限公司 | Performance detecting device and its method for radio network controller |
| CN103957437A (en) * | 2014-04-26 | 2014-07-30 | 吉安英佳电子科技有限公司 | Wireless servo portable high-integration digital multimedia all-in-one machine |
| CN104184490A (en) * | 2014-09-13 | 2014-12-03 | 中国电子科技集团公司第四十一研究所 | FDD-LTE terminal signal transmitting device |
| CN105227510A (en) * | 2015-11-09 | 2016-01-06 | 天津七一二通信广播有限公司 | A kind of new GMSK decoding circuit and coding/decoding method |
| CN105227510B (en) * | 2015-11-09 | 2018-04-20 | 天津七一二通信广播股份有限公司 | A kind of new GMSK decoding circuits and coding/decoding method |
| CN106297487A (en) * | 2016-09-18 | 2017-01-04 | 肇庆市高新区创客科技有限公司 | A kind of mobile communication instructional terminal device merging variform |
| CN108418611A (en) * | 2018-03-08 | 2018-08-17 | 成都坤恒顺维科技股份有限公司 | A kind of extensive Multiinputoutput wireless channel simulation instrument |
| CN108418611B (en) * | 2018-03-08 | 2019-11-08 | 成都坤恒顺维科技股份有限公司 | A kind of extensive Multiinputoutput wireless channel simulation instrument |
| CN108535540A (en) * | 2018-05-08 | 2018-09-14 | 成都信息工程大学 | A kind of method of magnetron radar transmitter frequency transient measurement |
| CN108535540B (en) * | 2018-05-08 | 2020-10-23 | 成都信息工程大学 | Method for instantaneously measuring transmitting frequency of magnetron radar |
| CN109523843A (en) * | 2018-11-16 | 2019-03-26 | 内蒙古师范大学 | A kind of experimental box with spectrum analysis function |
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Expiration termination date: 20111217 Granted publication date: 20030115 |