CN104993885B - Radio communication channel parameter estimation algorithm test system based on FPGA and Matlab - Google Patents
Radio communication channel parameter estimation algorithm test system based on FPGA and Matlab Download PDFInfo
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- CN104993885B CN104993885B CN201510250890.6A CN201510250890A CN104993885B CN 104993885 B CN104993885 B CN 104993885B CN 201510250890 A CN201510250890 A CN 201510250890A CN 104993885 B CN104993885 B CN 104993885B
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Abstract
The present invention discloses a set of radio communication channel parameter estimation algorithm test system based on FPGA and Matlab, is mainly used in the estimation of radio communication channel fading parameter in 400MHz 6GHz frequency bands.The characteristics of present invention is quickly calculated using FPGA, a set of radio communication channel fading parameter estimating system is devised in minibee platform Centos operating systems.The system produces the baseband signal of specified sequence first, by the transmitting terminal radiofrequency signal for obtaining specifying parameter after the steps such as modulation, digital-to-analogue conversion, power amplification, by the way that signal is received back to then by steps such as LPF, down coversion, analog-to-digital conversions to obtain baseband signal after wireless channel.The algorithm that radio communication channel fading parameter is estimated can be carried out fast verification by the present invention, estimate suitable for the channel fading parameters of broad frequency band, set expandability is preferable, it is easy to operate, and corresponding graphical user's display interface is devised, the channel fading parameters estimation hotspot graph in the range of given physical space can be drawn out.
Description
Technical field
The present invention relates to a kind of radio communication channel parameter estimation algorithm test system based on FPGA and Matlab.
Background technology
In the art, radio communication channel parameter estimation system is all typically subjected to hardware solidification, in fact
Existing process tedious, complexity, excessive cycle, adjustable are poor, it is difficult to quickly realize experiment measurement to new theory method, performance
Checking and algorithm improvement etc..
Due to being achieved in that by way of FPGA combinations DSP for most of estimation algorithms, although hardware implementation mode
With the high outstanding advantages of operation efficiency, but there is also write the problems such as cycle is long, debugging difficulty is big simultaneously.Therefore, will be non-
It is also a kind of trend that current algorithm is realized to require that software is made in relatively low part in real time and to operation efficiency.
The content of the invention
In view of the above-mentioned problems, a kind of combined by soft and hardware of present invention offer can be by radio communication channel fading parameter
The algorithm of estimation carries out the radio communication channel parameter estimation algorithm test system based on FPGA and Matlab of fast verification.
To reach above-mentioned purpose, radio communication channel parameter estimation algorithm test system of the present invention based on FPGA and Matlab
System, including signal transmitter unit, signal receiving unit and matlab radio communication channel parameter in assessing units,
Signal transmitting, signal receiving unit, including transmitting terminal and receiving terminal, the transmitting terminal is by the base of specified sequence
Band signal is launched to the receiving terminal, wherein the baseband signal of the specified sequence is produced by software program, the transmitting terminal and
The messaging parameter of the receiving terminal is set by software program, controlled；
The matlab radio communication channels parameter in assessing unit, for gathering the intermediate-freuqncy signal of transmitting terminal and receiving terminal
Magnitude of voltage, run radio communication channel parameter estimation algorithm, to the validity of the radio communication channel parameter estimation algorithm and
Accuracy is judged.
Further, the signal transmitting terminal, including PFGA modules, for described baseband signal to be passed through into square root liter
Cosine filters, interpolation, intermediate-freuqncy signal of the carrier modulation into 245.76MHz；
Intermediate frequency turns high-frequency model, for intermediate-freuqncy signal to be converted by digital-to-analogue, modulates, filtering, is obtained after radio-frequency head amplification
2.4576GHz radiofrequency signal, and intermediate-freuqncy signal is converted into and penetrated according to the gain factor and digital-to-analogue quantified precision of radio-frequency head
Frequency signal, radiofrequency signal is sent to the receiving terminal by wireless channel；
The receiving terminal, including high frequency turn ifd module, for the 2.4576GHz received radiofrequency signal to be led to successively
245.76MHz intermediate-freuqncy signal is obtained after crossing LPF, demodulation, variable gain amplification, analog-to-digital conversion, according to the increasing of radio-frequency head
Radio frequency terminal voltage value is converted into intermediate frequency by beneficial multiple and modulus quantified precision；
245.76MHz intermediate-freuqncy signal is directly deposited into the data storage of the FPGA module all the way, exported to described
Matlab radio communication channel parameter in assessing units, another way is by entering pre- place after the matched filtering of FPGA module and down coversion
Manage register.
Further, the matlab radio communication channels parameter in assessing unit is the calculating for being provided with Matlab softwares
Machine, the computer is by interface between software and hardware and the FPGA module, intermediate frequency turn high-frequency model, high frequency turns ifd module, described
Interface between software and hardware includes software control parameter interface, data input/output interface, FPGA configurations interface, hardware configuration interface, its
In, the software control parameter interface, for exporting the messaging parameter of the transmitting terminal and the receiving terminal；The data input
Output interface, for the signal transmitter unit, signal receiving unit and matlab radio communication channel parameter in assessing unit it
Between data transfer；The FPGA configures interface, for doing initial configuration and FPGA parameter settings to FPGA；The hardware
Interface is configured, for controlling intermediate frequency to turn high-frequency model, high frequency turns ifd module operational factor.
Specifically, the FPGA module includes symbol generation circuit, constellation mapping circuitry, the square root raised cosine filter of connection
Wave circuit, interpolation circuit, signal selecting circuit；And data storage, matched filtering circuit connect with the match circuit
Lower sampling circuit.
Further, in addition to graphical interface of user.
The present invention required change when radio communication channel parameter in assessing system survey messaging parameter (such as launch,
Gain of received signal, communications band, input signal control and read) make can software control input interface, while will be wireless
The verification portion of communication channel parameters estimation algorithm is put into software programming part, and the control logic required for algorithm for design connects
Mouth and data read and write interface.Under this framework, it can carry out quick actual measurement for result obtained by theoretical research and verify, and
Actual measurement scene can be effectively changed algorithm according to the demand of test, improve actual test and the efficiency of system call interception.
Brief description of the drawings
Fig. 1 is the radio communication channel parameter estimation algorithm test system structure framework of the invention based on FPGA and Matlab
Figure.
Embodiment
With reference to Figure of description, the present invention will be further described.
Present invention is mainly applied to the estimation of radio communication channel fading parameter in 400MHz-6GHz frequency bands.Profit of the invention
The characteristics of quickly being calculated with FPGA, a set of radio communication channel decline is devised in minibee platform Centos operating systems
Parameter estimation algorithm test system.The system produces the baseband signal of specified sequence first, passes through modulation, digital-to-analogue conversion, power
Amplification etc. obtains specifying the transmitting terminal radiofrequency signal of parameter after step, by the way that signal is received back to then to pass through after wireless channel
The steps such as LPF, down coversion, analog-to-digital conversion obtain baseband signal.
Radio communication channel parameter estimation algorithm test system of the invention based on FPGA and Matlab, including signal transmitting
Unit, signal receiving unit and matlab radio communication channel parameter in assessing units,
Signal transmitting, signal receiving unit, including transmitting terminal and receiving terminal, the transmitting terminal is by the base of specified sequence
Band signal is launched to the receiving terminal, wherein the baseband signal of the specified sequence is produced by software program, the transmitting terminal and
The messaging parameter of the receiving terminal is set by software program, controlled；
The matlab radio communication channels parameter in assessing unit, for gathering the intermediate-freuqncy signal electricity of transmitting terminal and receiving terminal
Pressure value, radio communication channel parameter estimation algorithm is run, to the validity and standard of the radio communication channel parameter estimation algorithm
True property is judged.
The signal transmitting terminal, including PFGA modules, for described baseband signal to be filtered by square root raised cosine
(SRRC filtering), interpolation, intermediate-freuqncy signal of the carrier modulation into 245.76MHz；
Intermediate frequency turns high-frequency model, for intermediate-freuqncy signal to be converted (DAC) by digital-to-analogue, modulates, filtering, after radio-frequency head amplification
2.4576GHz radiofrequency signal is obtained, and intermediate-freuqncy signal is converted according to the gain factor and digital-to-analogue quantified precision of radio-frequency head
Into radiofrequency signal, radiofrequency signal is sent to the receiving terminal by wireless channel；
The receiving terminal, including high frequency turn ifd module, for the 2.4576GHz received radiofrequency signal to be led to successively
245.76MHz intermediate-freuqncy signal is obtained after crossing LPF, demodulation, variable gain amplification, analog-to-digital conversion (ADC), according to radio frequency
Radio frequency terminal voltage value is converted into intermediate frequency by the gain factor and modulus quantified precision at end；
245.76MHz intermediate-freuqncy signal is directly deposited into the register of the FPGA module all the way, exported to described
Matlab radio communication channel parameter in assessing units, another way is by entering pre- place after the matched filtering of FPGA module and down coversion
Manage register.
The matlab radio communication channels parameter in assessing unit is the computer for being provided with Matlab softwares, the calculating
Machine is by interface between software and hardware and the FPGA module, intermediate frequency turn high-frequency model, high frequency turns ifd module, the interface between software and hardware bag
Software control parameter interface, data input/output interface, FPGA configurations interface, hardware configuration interface are included, wherein, the software control
Parameter interface processed, for exporting the messaging parameter of the transmitting terminal and the receiving terminal；The data input/output interface, is used for
Data transfer between the signal transmitter unit, signal receiving unit and matlab radio communication channel parameter in assessing units；
The FPGA configures interface, is set for doing initial configuration and other parameters to FPGA；The hardware configuration interface, is used for
Control the operational factor of hardware components.
The FPGA module includes symbol generation circuit, constellation mapping circuitry, square root raised cosine the filtering (SRRC of connection
Filtering) circuit, interpolation circuit, signal selecting circuit；And data storage, matched filtering circuit connect with the match circuit
Lower sampling circuit.
The operation of present system is as follows：
Particular baseband signal needed for testing is produced and sent to corresponding transmitting terminal register from software, according to algorithm
Precision needs change register memory space；The particular baseband signal is to need selected base band to believe according to actual test
Number.
Baseband signal is filtered by square root raised cosine, interpolation, carrier modulation into 245.76MHz intermediate-freuqncy signal, respectively
The parameter of individual module can be controlled by software input parameter.245.76MHz intermediate-freuqncy signal is converted into the high frequency-variable module institute in rear end
The signal mode needed.
Intermediate-freuqncy signal is converted by digital-to-analogue, modulated, filtering, 2.4576GHz radiofrequency signal is obtained after radio-frequency head amplification,
And voltage of intermediate frequency value is converted into by radio-frequency voltage value according to the gain factor and digital-to-analogue quantified precision of radio-frequency head.
Transmitting and reception signal.
The 2.4576GHz received radiofrequency signal is passed sequentially through into LPF, demodulation, variable gain amplification, modulus
245.76MHz intermediate-freuqncy signal is obtained after the steps such as conversion, will be penetrated according to the gain factor of radio-frequency head and modulus quantified precision
Frequency terminal voltage value is converted into intermediate frequency.
Algorithm computing is carried out after 245.76MHz intermediate-freuqncy signal is directly deposited into register all the way and read by software,
Another way after matched filtering and down coversion by entering pretreatment register in case subsequent algorithm needs.
According to the intermediate-freuqncy signal magnitude of voltage of the transmitting terminal and receiving terminal collected, corresponding radio communication channel parameter is applied mechanically
Estimation algorithm, validity and accuracy to algorithm are quickly judged, if the necessity for having modification to algorithm can be directly soft
Part part is carried out, and the data in hardware random access memory is written and read by matlab script files, the rewriting for algorithm
It can be carried out directly in matlab.FPGA hardware, which can be made, after modification sizing improves efficiency of algorithm.
The present invention is by radio communication channel parameter estimation algorithm part and communications reception, sending module separate design.Collection
Reception signal；According to control interface and the input and output of radio communication channel parameter estimation algorithm design software end and hardware end
Memory；According to the signal parameter demand required for radio communication channel parameter estimation algorithm, design interface allow users to from
Software end is operated, so that platform can adapt to the actual measurement experiment under different frequency range radio communication scene.According to nothing
Signal parameter demand required for line communication channel parameters estimation algorithm, design the hardware circuit of transmitting terminal and receiving terminal.According to
The demand of radio communication channel parameter estimation algorithm General Result, design corresponding test data dynamic realtime graphical user and show
Show interface.Design part general extension interface so that platform has more preferable autgmentability, is easy to user and makes an amendment.
The m parameter estimation of nakagami channels under the outer clearing 2.4GHz frequency range large scale fading environments of test cabinet, its
Specific method is as follows：
Display is connected on minibee by USB interface, minibee is connected to two 3db antenna, work frequency
Section is 2.4GHz.A terminal display port, the bin that will be copied in minibee are opened in centos operating systems
In file load to FPGA, use instruction SelectMAP xx.bin (xx is compiled bin file title).Pass through after success
Minicom fpga instruction unpack fpga consoles, check whether normal work operates fpga, if not provided, passing through
MBEEControl-r resets fpga, again loadbin files.After bin file is successfully downloaded to fpga, referred to by b4d
Fpga and minibee PORT COM is opened in order.Then, a terminal window is reopened, run matlab,
Matlab consoles directly run the main.m script files finished writing.Main script files contain 5 kinds of radio communication channel ginsengs
Number estimation algorithm, every kind of algorithm calculate 20 times in once running, and the signal length taken is 8192 sample quantization points.main.m
After the completion of script file performs, a terminal end is opened, (xx is compiled java to execute instruction java-jarxx.jar
GUI engineerings name), ejection graphic user interface dynamically show 5 kinds of radio communication channel parameter estimation algorithms for
The estimated value of nakagami signal m parameters, for different radio communication channel parameter estimation algorithms, the system can have rapidly
The estimated value calculated required for it of effect
The design parameter of our institute's value is as follows in this example：
Select_tx can input control signal " 0 " value first, now control transmitting terminal not export any signal, be come with this
Estimate the real-time noise of receiving terminal and interfering signal power, then Select_tx inputs " 1 " value, and now transmitting terminal base band can produce
Raw random signal.Select_qpsk_test inputs " qpsk "；TX_Gain input hexadecimal values " x4000 "；VGA gain is set
It is set to 8db；Filtering frequency range is arranged to 2.4576GHz；Receiver decay is arranged to 8db；Service aisle selects channel1.
If certain radio communication channel parameter estimation algorithm needs to set hardware parameter or FPGA parameter settings are entered
Row modification, the parameter in changing script in interface between software and hardware part, so as to reach the target quickly changed.
The present embodiment symbol generation circuit produces the signal of fixed character sequence, can be pilot signal in actual measurement.Institute
Signal selecting circuit is stated, has local channel algorithm for estimating in estimation, it is necessary to measure the noise power of channel to improve algorithm
Accuracy, the function of signal behavior are to reach measurement noise power and signal respectively by selecting the signal of different characteristic sequence
The target of power.
The algorithm that radio communication channel fading parameter is estimated can be carried out fast verification by the present invention, suitable for broad frequency band
Channel fading parameters estimation, set expandability is preferable, easy to operate, and devises corresponding graphical user's display interface,
The channel fading parameters estimation hotspot graph in the range of given physical space can be drawn out.
More than, only presently preferred embodiments of the present invention, but protection scope of the present invention is not limited thereto is any to be familiar with sheet
Those skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in should all be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by the protection domain that claim is defined.
Claims (5)
- A kind of 1. radio communication channel parameter estimation algorithm test system based on FPGA and Matlab, it is characterised in that：Including Signal transmitter unit, signal receiving unit and matlab radio communication channel parameter in assessing units,The signal transmitting, signal receiving unit, including transmitting terminal and receiving terminal, the transmitting terminal believe the base band of specified sequence Number transmitting is to the receiving terminal, wherein the baseband signal of the specified sequence is produced by software program, the transmitting terminal and described The messaging parameter of receiving terminal is set by software program, controlled；The matlab radio communication channels parameter in assessing unit, for gathering the intermediate-freuqncy signal voltage of transmitting terminal and receiving terminal Value, radio communication channel parameter estimation algorithm is run, to the validity of the radio communication channel parameter estimation algorithm and accurate Property is judged.
- 2. the radio communication channel parameter estimation algorithm test system according to claim 1 based on FPGA and Matlab, Characterized in that, the signal transmitting terminal, including PFGA modules, for described baseband signal to be filtered by square root raised cosine Ripple, interpolation, intermediate-freuqncy signal of the carrier modulation into 245.76MHz；Intermediate frequency turns high-frequency model, for intermediate-freuqncy signal to be converted by digital-to-analogue, modulates, filtering, is obtained after radio-frequency head amplification 2.4576GHz radiofrequency signal, and intermediate-freuqncy signal is converted into and penetrated according to the gain factor and digital-to-analogue quantified precision of radio-frequency head Frequency signal, radiofrequency signal is sent to the receiving terminal by wireless channel；The receiving terminal, including high frequency turn ifd module, low for the 2.4576GHz received radiofrequency signal to be passed sequentially through 245.76MHz intermediate-freuqncy signal is obtained after pass filter, demodulation, variable gain amplification, analog-to-digital conversion, according to the gain of radio-frequency head times Radio frequency terminal voltage value is converted into intermediate frequency by number and modulus quantified precision；245.76MHz intermediate-freuqncy signal is directly deposited into the data storage of the FPGA module all the way, exported to described Matlab radio communication channel parameter in assessing units, another way is by entering pre- place after the matched filtering of FPGA module and down coversion Manage register.
- 3. the radio communication channel parameter estimation algorithm test system according to claim 2 based on FPGA and Matlab, It is characterized in that：The matlab radio communication channels parameter in assessing unit is the computer for being provided with Matlab softwares, described Computer turns high-frequency model by interface between software and hardware and the FPGA module, intermediate frequency, high frequency turns ifd module communication and connected, described Interface between software and hardware includes software control parameter interface, data input/output interface, FPGA configurations interface, hardware configuration interface, its In, the software control parameter interface, for exporting the messaging parameter of the transmitting terminal and the receiving terminal；The data input Output interface, for the signal transmitter unit, signal receiving unit and matlab radio communication channel parameter in assessing unit it Between data transfer；The FPGA configures interface, for doing initial configuration and FPGA parameter settings to FPGA；The hardware Interface is configured, for controlling intermediate frequency to turn high-frequency model, high frequency turns ifd module operational factor.
- 4. the radio communication channel parameter estimation algorithm test system according to claim 2 based on FPGA and Matlab, It is characterized in that：The FPGA module includes the symbol generation circuit, constellation mapping circuitry, square root raised cosine filtered electrical of connection Road, interpolation circuit, signal selecting circuit, and data storage, matched filtering circuit and be connected with the matched filtering circuit Lower sampling circuit.
- 5. the radio communication channel parameter estimation algorithm test system according to claim 1 based on FPGA and Matlab, It is characterized in that：Also include graphical interface of user.
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