CN209472623U - A kind of wireless channel measurement system - Google Patents
A kind of wireless channel measurement system Download PDFInfo
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- CN209472623U CN209472623U CN201822241490.0U CN201822241490U CN209472623U CN 209472623 U CN209472623 U CN 209472623U CN 201822241490 U CN201822241490 U CN 201822241490U CN 209472623 U CN209472623 U CN 209472623U
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Abstract
A kind of wireless channel measurement system, including transmitting software-defined radio equipment, reception software-defined radio equipment, the two are physically isolated；The transmitting software-defined radio device configuration transmitting antenna receives software-defined radio device configuration receiving antenna；Transmitting software-defined radio equipment and reception software-defined radio equipment are separately connected transmitting terminal, receiving end computer by ICP/IP protocol.On the one hand the separation of the utility model transceiver avoids the loss of cable bring radio signal transmission, the dynamic range of lifting system increases measurement distance, on the other hand allows measurement process more convenient.Compared with existing wireless channel measurement platform, on the one hand the utility model passes through removal and higher radio-frequency cable is lost, increase the dynamic range of measuring table, promotes measurement distance, on the other hand avoids time-consuming frequency sweep, promote the real-time of measurement.
Description
Technical field
The wireless channel measurement system based on software radio that the utility model relates to a kind of.
Background technique
Wireless channel measurement platform is the precondition for realizing wireless channel measurement.Building a complete actual measurement platform needs
Want the support of a large amount of capital equipment and manpower.Existing wireless channel measurement platform is mostly based on Network Analyzer (Vector
Network analyzer, VNA) it is realized in frequency domain.Frequency domain measurement platform has the characteristics that with roomy, dynamic range is high.But
It is that the wireless channel measurement platform based on VNA is limited by terms of following two.On the one hand, it is swept since Network Analyzer uses
The mode of frequency measures the S parameter of wireless channel.It is limited to sweep velocity, Network Analyzer is not suitable for dynamic radio channel survey
Amount.On the other hand, the wireless measurement platform of Excavation Cluster Based on Network Analysis instrument needs to connect transmitting antenna by coaxial cable and receives day
Line.Coaxial cable can significantly reduce measurement accuracy to the loss of microwave bring.
Utility model content
The utility model provides a kind of wireless channel measurement system, overcome prior art measurement efficiency is low, real-time it is poor with
And technical problem inconvenient to use.
The technical solution of the utility model is:
A kind of wireless channel measurement system, including transmitting software-defined radio equipment, reception software-defined radio are set
Standby, the two is physically isolated；The transmitting software-defined radio device configuration transmitting antenna receives software-defined radio
Device configuration receiving antenna；Transmitting software-defined radio equipment and reception software-defined radio equipment pass through ICP/IP protocol
It is separately connected transmitting terminal, receiving end computer.
The utility model is based on two software-defined radio equipment NI-USRP-2920 and computer realizes wireless channel
Measuring table.Two equipment are respectively used to transmitting signal and receive signal.Every equipment is controlled by a computer respectively.It receives
Shared device and wired connection are not present between machine and transmitter.On the one hand the separation of transceiver avoids cable bring and penetrates
Frequency signal transmission attenuation, the dynamic range of lifting system increase measurement distance, on the other hand allow measurement process more convenient.With
Existing wireless channel measurement platform is compared, on the one hand the utility model passes through removal and higher radio-frequency cable is lost, and increases measurement
The dynamic range of platform promotes measurement distance, on the other hand avoids time-consuming frequency sweep, promote the real-time of measurement.
Meanwhile the utility model using software-defined radio device configuration flexibly, the convenient feature of upgrading, by itself and
Time domain wireless channel measurement platform scheme of people's Computer Design based on sliding related algorithm, and built using NI-USRP equipment
Channel measurement platform hardware prototype.The utility model uses the LabVIEW software programming platform of NI company, utilizes LabVIEW
Virtual instrument software can carry out seamless fusion, and structure figures with the software-defined radio equipment NI-USRP-2920 of NI company
Shape user interface, while the virtual instrument technology of LabVIEW can specify parameter and according to the actual situation with real-time display user
It is adjusted the configuration of measurement hardware parameter, baseband transmission signal generates, modulation, demodulation, sliding correlated channels shock response estimation
With the functions such as measurement result real-time display.For the multipath fading feature of wireless channel propagation, the utility model data processing is adopted
It is handled with sliding related algorithm, sliding related algorithm takes full advantage of its anti-multipath fading characteristic, and configuration flexibly, passes through expansion
The measurement accuracy of frequency gain promotion wireless channel impulse response.With the wireless channel measurement platform phase of traditional Excavation Cluster Based on Network Analysis instrument
Than there is the channel measurement platform of the utility model big dynamic range, far measuring distance, measurement scene to enrich, data processing is real
When the features such as.Simultaneously using matched LabVIEW software programming platform can make software wireless electrical parameter is easy to adjust, at data
The features such as reason is in real time, system upgrade is simple.The USRP of transmitting terminal sends by LabVIEW software programming platform and passes through BPSK tune
13 rank m-sequences of system.Baseband IQ samples rate is 25M Samples/s, and character rate is 12.5M Symbols/s, and time delay is differentiated
Rate is respectively 40 ns.Receiver is in dynamic reception state, signal to be sent by wireless channel propagation to receiving antenna,
The USRP of signal receiving end is received, then the BPSK demodulation module by having programmed can restore signal.In receiving end, USRP
It is demodulated by carrier wave and Phase synchronization realization radiofrequency signal and extracts IQ baseband signal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the flow chart of the utility model data processing；
Fig. 3 is that related algorithm principle assumption diagram is slided used by the utility model；
Fig. 4 is that related algorithm flow chart is slided used by the utility model.
Specific embodiment
Combined with specific embodiments below, the present invention will be further described.
As shown in Figure 1, the utility model construct it is a kind of based on the wireless channel of software-defined radio equipment and antenna survey
Amount system, the software-defined radio equipment NI-USRP-2920 including measuring analysis include that transmitting software definition is wireless
Electric equipment and reception software-defined radio equipment two, transmitting antenna, receiving antenna, the calculating that receiving and transmitting signal is handled
Machine.The transmitting software-defined radio device configuration transmitting antenna, receives software-defined radio device configuration and receives antenna,
And emit software-defined radio equipment and receive software-defined radio equipment by ICP/IP protocol be separately connected transmitting terminal,
Receiving end computer realizes data interaction, and computer realizes that the configured transmission control of software-defined radio equipment is related to sliding
Data processing.
The transmitting terminal and receiving end computer hardware configuration of the utility model are equal are as follows: processor: AMD A8-7650K
Radeon R7 3.3GHz；Memory: 8GB；Hard drive space: 250GB；Operating system: Windows 7.
And above-mentioned sliding related algorithm is the algorithm of this field routine, the realization of the algorithm on computers is this field
The ability of technical staff's routine.To avoid the occurrence of ambiguity, it is described below in sliding related algorithm is further described.
The course of work of the utility model is as follows: as shown in Fig. 2, the emitted antenna hair of transmitting software-defined radio equipment
Measuring signal out, the measuring signal are received antenna after wireless channel propagation and are received.The received measuring signal of receiving antenna
It is sent into and receives software-defined radio equipment, the transmitting receives the data letter that software-defined radio equipment will emit signal
Breath and the data information for receiving signal are exported respectively into transmitting terminal, receiving end computer, are finally completed in receiving end computer
The impulse response of wireless channel is obtained to transmitting signal and the sliding related algorithm processing for receiving signal data information.
The process that the utility model carries out wireless channel measurement is as follows:
Frequency, sample rate, symbol rate, transmitting gain, the reception gain etc. of allocation of computer software-defined radio equipment
Parameter；
Computer generates 13 rank m-sequences, and code length is 8191 bit；
M-sequence is modulated to frequency range radio frequency measuring signals to be measured by BPSK by transmitting software-defined radio equipment, and from
Transmitting terminal computer LabVIEW export transmitting signal data；
Transmitting antenna emission measurement signal；
Receiving antenna receives measuring signal, and is transferred to receiving end software-defined radio equipment；
Receiving end software-defined radio equipment demodulates the bpsk signal that receives, and by the base band data transmission after demodulation
To receiving end computer, demodulated transmitting signal data is exported from receiving end computer LabVIEW；
After receiving end computer is to sliding relevant treatment is carried out by transmitting derived from LabVIEW and reception two groups of signals of data
Obtain channel impulse response.
As shown in figure 3, data processing method in the utility model: transmitting antenna is issued to be made for the pseudo-random sequence of measurement
To emit signal, the m-sequence in pseudo-random sequence is chosen as transmitting signal, utilizes the two-value of pseudo-random sequence auto-correlation function
Characteristic.Transmitting signal can generate the influence of multi-path jamming and noise after wireless channel propagation.In receiving end, it is fixed to receive software
Adopted wireless device receives multipath signal through the receiving antenna and carries out sliding related operation with transmitting signal, by what is received
Multipath signal carries out sliding related operation with the pseudo-random sequence of transmitting, when the pseudo-random sequence and transmitting terminal pseudorandom of receiving end
When the arrangement of sequence aligns, since putting in order for two pseudo-random sequences identical will generate maximum relevant peaks.When two
When a sequence is not aligned, the pseudo-random sequence mixed-bandwidth for receiving signal with transmitting is extended.The signal in different paths can be
Different moments reach receiving end, they obtain different relevant peaks with the pseudo-random sequence correlation of transmitting in different moments, related
The distance between peak is the relative time delay of each multipath component, to obtain the impulse response of wireless channel.It slides relevant
Expression formula is
Wherein, s (t) is transmitting signal, and r (t) is the multipath signal received.
As shown in figure 4, carrying out the flow chart of related operation for sliding related algorithm, the data processing step of related algorithm is slided
It suddenly is after emitting signal data and reception signal data export in the LabVIEW program of transmitting terminal and receiving end respectively
And save respectively, transmitting signal data and reception signal data are then subjected to sliding relevant treatment to obtain the impulse of channel
Response.The pseudocode of sliding related algorithm is expressed as follows:
Wherein, Tx, Rx, Z, X are vector,MIndicate a cycle length of m-sequence.
Claims (2)
1. a kind of wireless channel measurement system, which is characterized in that including transmitting software-defined radio equipment, receive software definition
Wireless device, the two are physically isolated；It is fixed to receive software for the transmitting software-defined radio device configuration transmitting antenna
Adopted wireless device configures receiving antenna；Transmitting software-defined radio equipment and reception software-defined radio equipment pass through
ICP/IP protocol is separately connected transmitting terminal, receiving end computer.
2. a kind of wireless channel measurement system according to claim 1, which is characterized in that the transmitting software definition is wireless
Electric equipment and receives software-defined radio equipment and be all made of NI-USRP-2920 model.
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| CN201822241490.0U CN209472623U (en) | 2018-12-28 | 2018-12-28 | A kind of wireless channel measurement system |
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| CN201822241490.0U CN209472623U (en) | 2018-12-28 | 2018-12-28 | A kind of wireless channel measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075465A (en) * | 2021-03-30 | 2021-07-06 | 同济大学 | Method for measuring reflection coefficient of tag coding antenna |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075465A (en) * | 2021-03-30 | 2021-07-06 | 同济大学 | Method for measuring reflection coefficient of tag coding antenna |
| CN113075465B (en) * | 2021-03-30 | 2022-05-13 | 同济大学 | Method for measuring reflection coefficient of tag coding antenna |
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