CN105281844A - Broadband multi-antenna wireless channel measuring system and method thereof - Google Patents
Broadband multi-antenna wireless channel measuring system and method thereof Download PDFInfo
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Abstract
The invention discloses a broadband multi-antenna wireless channel measuring system and a broadband multi-antenna wireless channel measuring method. The broadband multi-antenna wireless channel measuring system transmits signals via different transmitting antennas by utilizing a first switching switch so that transmitting ends transmit the signals in a time division multiplexing manner, receives signals via different receiving antennas by utilizing a second switching switch so that receiving ends receive the signals in a time division multiplexing manner, demodulates the received signals through the receiving ends to obtain channel impulse response after spectrum spreading, and despreads the channel impulse response after spectrum spreading and removes response of the transmitting ends and the receiving ends through a background processing device, so as to obtain pure channel impulse response for subsequent calculation of wireless channel characteristics. The channel impulse response obtained through measurement is high in accuracy, and the whole measuring system is simple in structure and relatively low in price.
Description
Technical field
The present invention relates to communication technique field, particularly relate to a kind of broadband multi-antenna wireless channel measurement system and method thereof.
Background technology
Parameter in existing wireless channel model obtains based on the measurement data of American-European countries mostly.In the research and development of the third generation and forth generation mobile communication system, the wireless channel model that the Dou Shi American-European countries that China adopts proposes.Due to the difference of geographical environment and population distribution etc., external measurement result and the channel model set up thus are not exclusively applicable for China.If still continue to use external wireless channel model in the research and development of the third generation mobile communication system, the validity applied in engineering with this model system that is optimization aim will certainly be affected.Therefore, in order to occupy catbird seat in the competition of next generation mobile communication system standard, it is extremely important for setting up the broadband multi-antenna wireless channel model adapted to China characteristic environment facies.
And set up broadband multi-antenna wireless channel model and necessarily require us to study measurement and the method for estimation of the wireless channel key characterization parameter under high bandwidth multiple antennas condition, in conjunction with measured data, statistical theory modeling and simulation platform etc., channel characteristics parameter is analyzed and revised, set up the wireless channel model meeting indoor, outdoor and special applications scene actual propagation situation.
In design of wireless systems, accurate understanding wireless propagation environment is very important.An efficient channel measuring table that us can be made to understand electromagnetic transmission mechanism is better indispensable when detection wireless environment.But we do not understand its ins and outs to the wireless channel measurement system that industry is famous, can only obtain the data processed, be difficult to modify according to the actual requirements, as realized the wireless channel measurement system etc. of spaced antenna.In addition, the price of existing wireless channel measurement system is all very expensive, offers more than 1,000,000 Euros.
Summary of the invention
Main purpose of the present invention is the complicated and expensive problem of the traditional wireless channel measurement system configuration that solves.
For arriving above-mentioned technical purpose, the invention provides a kind of broadband multi-antenna wireless channel measurement system, described broadband multi-antenna wireless channel measurement system comprises emitter, receiving system and background process device:
Described emitter comprises multiple transmitting antenna, transmitting terminal and the first diverter switch, described transmitting terminal is in order to produce detectable signal and to export modulation signal after detectable signal is modulated spread spectrum to described multiple transmitting antenna, and described first diverter switch is successively connected with described transmitting terminal in order to control described multiple transmitting antenna;
Described receiving system comprises multiple reception antenna, receiving terminal and the second diverter switch, the described modulation signal that described multiple reception antenna goes out in order to receive described multiple transmission antennas transmit, described receiving terminal carries out demodulation in order to the described modulation signal received described multiple reception antenna and obtains the channel impulse response after spread spectrum, and described second diverter switch is successively connected with described receiving terminal in order to control described multiple reception antenna;
Described background process device in order to the channel impulse response after described spread spectrum is carried out despreading and removes the response of transmitting terminal and receiving terminal, to obtain pure channel impulse response.
Preferably, described broadband multi-antenna wireless channel measurement system also comprises control device, described control device is in order to control described receiving terminal and described transmitting terminal, keep synchronous to make described receiving terminal Received signal strength and described transmitting terminal transmit, described control device, also in order to control described second diverter switch and described first diverter switch, keeps synchronism switching to make described second diverter switch and described first diverter switch.
Preferably, described control device comprises the first controller be connected with described transmitting terminal and described first diverter switch and the second controller be connected with described receiving terminal and described second diverter switch, described first controller and described second controller are equipped with GPS module, to keep described receiving terminal Received signal strength to transmit synchronous with described transmitting terminal, and keep the switching of the switching of described second diverter switch and described first diverter switch synchronous.
Preferably, described first controller controls described transmitting terminal and transmits with First Speed, and control described first diverter switch and switch with second speed, described second controller controls described receiving terminal with third speed Received signal strength, and control described second diverter switch and switch with the 4th speed, described First Speed is equal with described third speed, and described 4th speed is greater than described second speed.
Preferably, described background process device comprises the characteristic extracting module in order to extract the characteristic parameter of channel according to described pure channel impulse response.
For arriving above-mentioned technical purpose, the present invention also provides a kind of broadband multi-antenna wireless channel measurement method, and described broadband multi-antenna wireless channel measurement method comprises the following steps:
Detectable signal is modulated the modulation signal employing time division multiplexing mode transmitting of spread spectrum generation by one end of broadband multi-antenna wireless channel;
The described modulation signal that one end that the other end of broadband multi-antenna wireless channel adopts time division multiplexing mode to receive described broadband multi-antenna wireless channel is launched, and the described modulation signal received is carried out demodulation obtain the channel impulse response after spread spectrum;
Channel impulse response after described spread spectrum is carried out despreading process and removes described one end of broadband multi-antenna wireless channel and the response of the other end to obtain pure channel impulse response by the other end of described broadband multi-antenna wireless channel.
Preferably, described broadband multi-antenna wireless channel measurement method also comprises: the other end of described broadband multi-antenna wireless channel extracts the characteristic parameter of channel according to described pure channel impulse response.
Preferably, detectable signal is modulated modulation signal that spread spectrum produces and is adopted time division multiplexing mode to launch specifically to comprise by one end of described broadband multi-antenna wireless channel: detectable signal is first modulated spread spectrum and produced modulation signal by one end of described broadband multi-antenna wireless channel, then described modulation signal is successively carried out amplification and filtering process, then adopt time division multiplexing mode to be launched by the described modulation signal after amplification and filtering process.
Preferably, the other end of described broadband multi-antenna wireless channel adopts time division multiplexing mode to receive the described modulation signal of one end transmitting of described broadband multi-antenna wireless channel, and the described modulation signal received is carried out demodulation and obtain the channel impulse response after spread spectrum and specifically comprise: the described modulation signal that one end that the other end of described broadband multi-antenna wireless channel adopts time division multiplexing mode to receive described broadband multi-antenna wireless channel is launched, then the described modulation signal received successively carried out filtering and amplify process, then the described modulation signal of the reception after filtering and amplification process is carried out demodulation and obtain the sound of the channel impulse after spread spectrum.
Preferably, channel impulse response after described spread spectrum is carried out despreading process and removes described one end of broadband multi-antenna wireless channel and the response of the other end also comprises to obtain pure channel impulse response by the other end of described broadband multi-antenna wireless channel: adopt radio frequency cable by one end of described broadband multi-antenna wireless channel and the other end direct-connected, and test obtains described one end of broadband multi-antenna wireless channel and the response of the other end.
Broadband multi-antenna wireless channel measurement system provided by the invention and method thereof, described broadband multi-antenna wireless channel measurement system utilizes the first diverter switch from different transmission antennas transmit signals, transmitting terminal is made to adopt time division multiplexing mode to transmit, similarly, utilize the second diverter switch by different reception antenna Received signal strength, receiving terminal is made to adopt time division multiplexing mode Received signal strength, and carry out demodulation to received signal by receiving terminal and obtain the channel impulse response after spread spectrum, and by background process device despreading carried out to the channel impulse response after described spread spectrum and remove the response of transmitting terminal and receiving terminal, to obtain pure channel impulse response for subsequent calculations radio channel characteristic, measure the high and whole simple in measurement system structure of the channel impulse response accuracy that obtains and relative low price.
Accompanying drawing explanation
Fig. 1 is the first diverter switch of broadband multi-antenna wireless channel measurement system provided by the invention and the sequential chart of the second diverter switch;
Fig. 2 is the structural representation of an embodiment of broadband multi-antenna wireless channel measurement system provided by the invention;
The structural representation that Fig. 3 specifically implements for the broadband multi-antenna wireless channel measurement system shown in Fig. 2;
Fig. 4 is the key parameter table of the broadband multi-antenna wireless channel measurement system that Fig. 3 proposes;
Fig. 5 is the schematic diagram of the transmitting antenna of the broadband multi-antenna wireless channel measurement system shown in Fig. 2;
Fig. 6 is the schematic flow sheet of an embodiment of broadband multi-antenna wireless channel measurement method provided by the invention;
The schematic diagram of the reprocessing of the broadband multi-antenna wireless channel measurement method that Fig. 7 provides for Fig. 6.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In measuring process, transmitting antenna and reception antenna often complete once complete signal sampling, be referred to as a snapshot (Snapshot) or a sample cyclic (Cycle) of channel, be illustrated in figure 1 the first diverter switch of broadband multi-antenna wireless channel measurement system provided by the invention and the sequential chart of the second diverter switch, suppose that transmitting antenna array element number is M, reception antenna array element number is N, Tg is the protection interval of speed-sensitive switch when switching, Tsc is the activationary time of the single array element of reception antenna, Tr is the summation of the switching time between the activationary time of reception antenna array element and array element, Tr > Tsc.The time that a certain transmitting antenna array element activates is Tt, and all transmitting antenna array element and the reception antenna array element time activated once is Tcy.By estimating the scattering object situation of movement measuring scene, provide the estimated value of channel coherency time, setting sample cyclic time Tcy is positioned within the scope of coherence time, thus channel the quasi-static characteristics in measuring process is remained unchanged.
Fig. 2 is an embodiment of broadband multi-antenna wireless channel measurement system provided by the invention, Fig. 3 is the concrete enforcement structure chart of the broadband multi-antenna wireless channel measurement system shown in Fig. 2, Fig. 4 is the key parameter table of the broadband multi-antenna wireless channel measurement system shown in Fig. 3, obviously, for the broadband multi-antenna wireless channel measurement system 100 of difference configuration, its key parameter is not identical, and therefore, the key parameter table of the broadband multi-antenna wireless channel measurement system 100 of Fig. 4 is only for reference.
Refer to Fig. 2 to Fig. 4, the invention provides a kind of broadband multi-antenna wireless channel measurement system 100, described broadband multi-antenna wireless channel measurement system 100 comprises emitter (non-label), receiving system (non-label) and background process device 7.
Described emitter comprises transmitting terminal 1, multiple transmitting antenna 2 and the first diverter switch 3, described transmitting terminal 1 is in order to produce detectable signal and to export modulation signal after detectable signal is modulated spread spectrum to described multiple transmitting antenna 2, described first diverter switch 3 is connected between described transmitting terminal 1 and described multiple transmitting antenna 2, is successively connected with described transmitting terminal 1 in order to control described multiple transmitting antenna 2.
Described receiving system comprises multiple reception antenna 4, receiving terminal 5 and the second diverter switch 6, the described modulation signal that described multiple reception antenna 4 is launched in order to receive described multiple transmitting antenna 2, described receiving terminal 5 carries out demodulation in order to the described modulation signal received described multiple reception antenna 4 and obtains the channel impulse response after spread spectrum, described second diverter switch 6 is connected between described multiple reception antenna 4 and described receiving terminal 5, is successively connected with described receiving terminal 5 in order to control described multiple reception antenna 4.
Described background process device 7 in order to the channel impulse response after described spread spectrum is carried out despreading and removes the response of transmitting terminal 1 and receiving terminal 5, to obtain pure channel impulse response.
Described first diverter switch 3 and described second diverter switch 6 are speed-sensitive switch.
Preferably, described broadband multi-antenna wireless channel measurement system 100 also comprises control device 8, described control device 8 is in order to control described receiving terminal 5 and described transmitting terminal 1, to transmit with described transmitting terminal 1 to make described receiving terminal 5 Received signal strength and keep synchronous, described control device 8 is also in order to control described second diverter switch 6 and described first diverter switch 3, to make the switching of the switching of described second diverter switch 6 and described first diverter switch 3 keep synchronous, ensure that the signal that described transmitting terminal 1 is launched all intactly can be received by described receiving terminal 5.
Particularly, described control device 8 comprises the first controller 81 be connected with described transmitting terminal 1 and described first diverter switch 3 and the second controller 82 be connected with described receiving terminal 5 and described second diverter switch 6, described first controller 81 and described second controller 82 are equipped with GPS module, to keep described receiving terminal 5 Received signal strength to transmit synchronous with described transmitting terminal 1, and keep the switching of the switching of described second diverter switch 6 and described first diverter switch 3 synchronous.
Described first controller 81 controls described transmitting terminal 1 and described first diverter switch 3 and described second controller 82, and to control the embodiment of described receiving terminal 5 and described second diverter switch 6 as follows:
Described first controller 81 sends first frequency if the control signal pulse of 1pps is with the speed transmitted of transmitting terminal 1 as described in controlling to described reflector 11, sends the switch speed of second frequency first diverter switch 3 as described in the control signal Pulse Width Control of 1kpps to described first diverter switch 3.Described second controller 82 sends the 3rd frequency if the control signal pulse of 10kpps is with the switch speed of the second diverter switch 6 as described in controlling to described second diverter switch 6, sends the 4th frequency if the control signal pulse of 1pps is with the speed of the Received signal strength of receiving terminal 5 as described in controlling to described receiving terminal 5.Described First Speed is equal with described third speed, namely described first frequency is equal with described 3rd frequency, described 4th speed is greater than described second speed, namely described 4th frequency is greater than described second frequency, thus can ensure that the signal gone out from described multiple transmission antennas transmit all can be received by described multiple reception antenna.
Preferably, described transmitting terminal 1 comprises reflector 11, first amplifier 12 and the first filter 13 that connect successively, described reflector 11 is in order to produce described detectable signal and to produce described modulation signal by after described detectable signal modulation spread spectrum, described first amplifier 12 is in order to carry out amplification process to described modulation signal, described first filter 13 exports described multiple transmitting antenna 2 to after carrying out filtering process to the described modulation signal after described first amplifier 12 amplification.Described first amplifier 12 can be common power amplifier, and described first filter 13 can be cavity body filter.
Preferably, described reflector 11 is E4438C detection signal generator.The output of E4438C detection signal generator is modulated spread spectrum code sequence and PN code, for this reason, only need set the burst and pseudo-random code sequence wanting to send during measurement, E4438C just can be exported successively, and does not need the manual operation carrying out other again.
Preferably, described receiving terminal 5 comprises the second filter 51, second amplifier 52 and the receiver 53 connected successively, described second filter 51 carries out filtering process in order to the described modulation signal received described multiple reception antenna 4, described second amplifier 52 is in order to carry out amplification process to the described modulation signal after filtering process, described receiver 53 carries out demodulation obtain the channel impulse response after described spread spectrum in order to the described modulation signal to filtering and after amplifying process.
Described second filter 51 can be cavity body filter, described second amplifier 52 can be low noise amplifier to improve signal to noise ratio, in order to prevent the nonlinear interaction of LNA during practical operation, filtering harmonic component can be carried out at output cascade filter of described second amplifier 52 further, the signal after filtering is delivered to described receiver 53.
Preferably, described receiver 53 is TektronixMSO70804C.Because the detectable signal carrier frequency after modulation is higher, if adopt simple nyquist sampling, then require that sample frequency meets nyquist sampling theorem, if the centre frequency of the detectable signal after described modulation is higher, the sample frequency so required also becomes large thereupon, sampled point can be caused so sharply to increase, acid test is brought to the equipment storing data, based on this, the present embodiment adopts the oscilloscope TektronixMSO70804C with the function such as frequency sweep and the logical acquisition, storage of band as receiver 53, due to the bandpass sampling function of oscilloscope TektronixMSO70804C, so can sample and then recovering signal to modulation signal with less sample frequency.
Preferably, described background process device 7 comprises the characteristic extracting module of the characteristic parameter in order to extract channel according to described channel impulse response, and the characteristic parameter of described channel comprises signal and leaves angle and direction of arrival.Particularly, described background process device 7 is MATLABPostProcessing analytic unit, and described characteristic extracting module is SGAE function sub-modules.
Preferably, refer to Fig. 5, described transmitting antenna 2 is in square area, be uniformly distributed by the paster antenna of multiple orientation the squaerial array formed.Horizontal dimensions is listed in and vertical dimensions all has array element to distribute due to square-shaped array, and be homogenous linear battle array from single dimension, therefore azimuth and angle of pitch information can be obtained, measurable angular range is azimuth [0:180 °], the angle of pitch [-90 °: 90 °], because the resolution of different angles incoming wave in same time delay is relevant with the number of bay, so this array uses in emitting side, the 3D that can characterize under the characteristic of transmitting antenna 2 coverage sector propagates.
Preferably, described reception antenna 4 is the omni-directional antenna arrays formed a circle by the paster antenna of multiple orientation.Due to the directionality of each antenna patch, and, omni-directional antenna arrays there are ± 45 ° two kinds the bays configured that polarize, can the scope of taking measurement of an angle be azimuth [-180 °: 180 °], the angle of pitch [-55 °: 90 °], the comprehensive vertical dimensions information of mobile terminal can be caught, and the different angle of arrival can be distinguished or leave the impulse response component at angle, thus more comprehensively can capture all multipath components in space.
Broadband multi-antenna wireless channel measurement system provided by the invention, utilizing high speed COMS bus exchange switch i.e. the first diverter switch 3 to transmit from different transmitting antennas 2 is pseudo random sequence, makes transmitting terminal 1 adopt time division multiplexing mode to transmit.Similarly, utilize high speed COMS bus exchange switch i.e. the second diverter switch 6 by different reception antenna 4 Received signal strength, make receiving terminal 5 adopt time division multiplexing mode Received signal strength.Then, receiving terminal 5 adopts the mode (according to slippage correlation acquisition method) of matched filtering to obtain the channel impulse response of time delay domain to the signal received.The response of transmitting terminal 1 and receiving terminal 5 can be obtained by radio frequency cable connection transmitting terminal 1 and receiving terminal 5, the autocorrelation performance that background process device 7 utilizes pseudo noise code good, internal system response can be peeled off with generalized channel impulse response by the mode of deconvolution, to obtain generalized channel impulse response, i.e. follow-up said pure channel impulse response, and then, can carry out reprocessing according to pure channel impulse response and obtain the characteristic parameter of channel.
Before measurement task starts, according to measure planning and link budget (LinkBudget), the time delay distribution situation under surveyed scene should be estimated.According to time delay distribution situation, utilize the Cycle Length of Survey Software reasonable disposition pseudo random sequence, the Cycle Length of pseudo random sequence is made to be greater than the maximum additional time delay of broadband multi-antenna wireless channel, can ensure that reception antenna 4 receives all multipath components like this, and obtain complete channel impulse response.
Principle in broadband multi-antenna wireless channel measurement system provided by the invention is specific as follows:
(1), transmitting terminal 1 is set to send modulation signal as x (t), constant when the response of antenna can be considered, suppose that the response of transmitting antenna 2 is G
tx(φ, θ), the response of reception antenna 4 is G
rx(φ, θ), wherein φ shows space level angle, θ representation space luffing angle.
(2), wireless channel impulse response is h (t, τ), and t represents the time, and τ represents time delay.
(3) test, factually and can obtain, constant when the response of transmitting terminal 1 and receiving terminal 5 is, so can be expressed as: R
tx(τ) and R
rx(τ).
The Received signal strength y (t, τ) of receiving terminal 5 can be expressed as:
y(t,τ)＝x(t)*R
tx(τ)*G
tx(φ,θ)*h(t,τ)*G
rx(φ,θ)*R
rx(τ)
Due to the timeinvariance of the response of transmitting antenna 2 and reception antenna 4, the response of transmitting antenna 2 and reception antenna 4 and wireless channel impulse can be rung and merge the loud h of the wireless channel impulse being written as broad sense
total(t, τ).Former formula abbreviation is:
y(t,τ)＝x(t)*R
tx(τ)*h
total(t,τ)*R
rx(τ)
Make u (t, τ)=x (t) * R
tx(τ) * R
rx(τ), former formula abbreviation is:
y(t,τ)＝u(t,τ)*h
total(t,τ)
The u of above formula and checking data, essentially, checking data u is the baseband signal that detectable signal obtains through transmitting terminal 1 and receiving terminal 5 and without wireless channel, u is removed the wireless channel impulse that just can obtain broad sense and rings h
total(t, τ) be i.e. described pure channel impulse response.In broadband multi-antenna wireless channel measurement system provided by the invention, described receiving terminal 5 directly can obtain the response R of whole broadband multi-antenna wireless channel measurement system
tx(τ) * h
total(t, τ) * R
rx(τ) channel impulse response namely after said described spread spectrum, that is described receiving terminal 5 removes the x (t) in u, and therefore, follow-up described background process device 7 only needs the response R by transmitting terminal 1 and receiving terminal 5
tx(τ) * R
rx(τ) from the response R of whole broadband multi-antenna wireless channel measurement system
tx(τ) * h
total(t, τ) * R
rx(τ) remove in, the wireless channel impulse that just can obtain broad sense rings h
total(t, τ) be i.e. described pure channel impulse response.Concrete removal R
tx(τ) * R
rx(τ) as follows:
First, adopt radio frequency cable direct-connected receiving terminal 1 and transmitting terminal 5, measure the response h obtaining described transmitting terminal 1 and described receiving terminal 5
c(t, τ)=R
tx(τ) * R
rx(τ), specific as follows:
A, by described transmitting terminal 1 and described receiving terminal 5 direct-connected by RF cable, test the measured signal obtained without transmitting antenna 2, wireless channel and reception antenna 4;
B, measured signal is carried out down-conversion and low pass filter, and by down-sampling process, the signal intercepting a complete spread spectrum code sequence PN code length is as the baseband signal without wireless channel after responding through described transmitting terminal 1 and described receiving terminal 5;
C, by the described baseband signal without wireless channel, to carry out conjugation relevant to the baseband signal recorded through wireless channel, to obtain the response h of described transmitting terminal 1 and described receiving terminal 5
c(t, τ)=R
tx(τ) * R
rx(τ).
Obtain the response h of described transmitting terminal 1 and described receiving terminal 5
cafter (t, τ), described background process device 7 can calculate pure channel impulse response h by following formula
total(t, τ)=h (t, τ):
Wherein, f
s(h (t, τ)) expression carries out Fourier transform to the τ in h (t, τ), f
-1represent inverse fourier transform.
Fig. 6 is an embodiment of broadband multi-antenna wireless channel measurement method provided by the invention, refer to Fig. 2, Fig. 3 and Fig. 6, in the present embodiment, one end of broadband multi-antenna wireless channel is provided with transmitting terminal 1 and the first diverter switch 3, the other end of broadband multi-antenna wireless channel is provided with the second diverter switch 6, receiving terminal 5 and background process device 7, described background process device 7 comprises characteristic extracting module, and one end of described broadband multi-antenna wireless channel and the response of the other end are the response of described transmitting terminal 1 and described receiving terminal 5.Described broadband multi-antenna wireless channel measurement method comprises the following steps:
Step S101: transmitting terminal 1 produces detectable signal and exports modulation signal by after described detectable signal modulation spread spectrum, and described modulation signal is successively launched by multiple transmitting antenna 2.
Step S102: receiving terminal 5 successively receives by multiple reception antenna 4 the described modulation signal that described multiple transmitting antenna 2 launches, and the described modulation signal that the described multiple transmitting antennas 2 received are launched is carried out demodulation obtain the channel impulse response after spread spectrum.
Step S103: the channel impulse response after described spread spectrum is carried out despreading process to background process device 7 and the response of removing transmitting terminal 1 and receiving terminal 5 obtains pure channel impulse response.Described background process device 7 can be MATLABPostProcessing analytic unit.
Please consult Fig. 7 further, the schematic diagram of the reprocessing of the broadband multi-antenna wireless channel measurement method that Fig. 7 provides for Fig. 6.Also namely broadband multi-antenna wireless channel measurement method provided by the invention also can comprise reprocessing: the characteristic parameter that can obtain channel impulse response according to pure channel impulse response combining geographic location information comprises acceptance angle ASD, the shadow fading SF, delay spread DS, L-S distribution fading coefficients K etc. that signal leaves angle ASA, signal.The post-processing step of described broadband multi-antenna wireless channel measurement method specifically comprises step S104: characteristic extracting module extracts the characteristic parameter of channel according to described pure channel impulse response, the characteristic parameter of described channel comprises signal and leaves angle ASA and direction of arrival ASD, and described characteristic extracting module is SGAE function sub-modules.
In step s 102, the time delay domain impulse response h that obtains of a certain moment t
schannel impulse response after (t, τ) i.e. described spread spectrum contains the impact of the response of transmitting terminal and receiving terminal, in order to obtain pure channel impulse response h (t, τ), needs the response removing by transmitting terminal and receiving terminal.
For this reason, described step S103 also comprises the response of measuring and obtaining transmitting terminal 1 and receiving terminal 5.The response of described transmitting terminal 1 and receiving terminal 5 described receiving terminal 5 and the direct-connected measurement of described transmitting terminal 1 is obtained by RF cable, and concrete grammar is as follows:
A, by described transmitting terminal 1 and described receiving terminal 5 direct-connected by RF cable, test the measured signal obtained without transmitting antenna 2, wireless channel and reception antenna 4;
B, measured signal is carried out down-conversion and low pass filter, and by down-sampling process, the signal intercepting a complete spread spectrum code sequence PN code length is as the baseband signal without wireless channel after responding through described transmitting terminal 1 and described receiving terminal 5;
C, by the described baseband signal without wireless channel, to carry out conjugation relevant to the baseband signal recorded through wireless channel, to obtain the response of described transmitting terminal 1 and described receiving terminal 5.
Particularly, step S101 specifically comprises: reflector 11 produces described detectable signal and modulated by described detectable signal after spread spectrum produces described modulation signal and exports the first amplifier 12 to, the first filter 13 is exported to after described first amplifier 12 carries out power amplification to described modulation signal, described first filter 13 exports described multiple transmitting antenna 2 to after carrying out filtering to the described modulation signal after amplification, and described multiple transmitting antenna 2 is successively connected with the output of described first filter 13 by the first diverter switch 3 and is successively launched by described modulation signal.
Particularly, step S102 specifically comprises: multiple reception antenna 4 receives the described modulation signal that described multiple transmitting antenna 2 is launched, and be successively connected with the second filter 51 by the second diverter switch 6 and the described modulation signal received exported to described second filter 51, the second amplifier 52 is exported to after described second filter 51 carries out filtering process to described modulation signal, described second amplifier 52 exports receiver 53 to after carrying out amplification process to described modulation signal, described receiver 53 carries out demodulation to described modulation signal and obtains the channel impulse response after spread spectrum.
Broadband multi-antenna wireless channel measurement system provided by the invention and method thereof have following beneficial effect:
(1), broadband multi-antenna wireless channel measurement system provided by the invention while ensure that the accuracy of measurement, simplify measuring system complexity, thus saved cost.
(2), transmitting terminal can be separated in measuring process with receiving terminal, can meet the measurement mission requirements under remote, mobile status.
(3), described first controller and described second controller have GPS module, can ensure the synchronous of sending and receiving end measuring-signal.
(4), there is high speed COMS bus exchange switch (the first diverter switch and the second diverter switch), can ensure within the coherence time that the image data antennae polling time is positioned at channel, thus channel the quasi-static characteristics in measuring process is remained unchanged.
(5), adopt the direct-connected transmitting terminal of radio frequency cable and receiving terminal, can calibrate measuring equipment, the transmitting terminal in removal signal and the response of receiving terminal, and then obtain the broad sense wireless channel of wireless channel impulse response and dual-mode antenna acting in conjunction formation.
These are only the preferred embodiments of the present invention; not thereby its scope of the claims is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; directly or indirectly be used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a broadband multi-antenna wireless channel measurement system, is characterized in that, described broadband multi-antenna wireless channel measurement system comprises emitter, receiving system and background process device:
Described emitter comprises multiple transmitting antenna, transmitting terminal and the first diverter switch, described transmitting terminal is in order to produce detectable signal and to export modulation signal after detectable signal is modulated spread spectrum to described multiple transmitting antenna, and described first diverter switch is successively connected with described transmitting terminal in order to control described multiple transmitting antenna;
Described receiving system comprises multiple reception antenna, receiving terminal and the second diverter switch, the described modulation signal that described multiple reception antenna goes out in order to receive described multiple transmission antennas transmit, described receiving terminal carries out demodulation in order to the described modulation signal received described multiple reception antenna and obtains the channel impulse response after spread spectrum, and described second diverter switch is successively connected with described receiving terminal in order to control described multiple reception antenna;
Described background process device in order to the channel impulse response after described spread spectrum is carried out despreading and removes the response of transmitting terminal and receiving terminal, to obtain pure channel impulse response.
2. broadband multi-antenna wireless channel measurement system as claimed in claim 1, it is characterized in that, described broadband multi-antenna wireless channel measurement system also comprises control device, described control device is in order to control described receiving terminal and described transmitting terminal, keep synchronous to make described receiving terminal Received signal strength and described transmitting terminal transmit, described control device, also in order to control described second diverter switch and described first diverter switch, keeps synchronism switching to make described second diverter switch and described first diverter switch.
3. broadband multi-antenna wireless channel measurement system as claimed in claim 2, it is characterized in that, described control device comprises the first controller be connected with described transmitting terminal and described first diverter switch and the second controller be connected with described receiving terminal and described second diverter switch, described first controller and described second controller are equipped with GPS module, to keep described receiving terminal Received signal strength to transmit synchronous with described transmitting terminal, and keep the switching of the switching of described second diverter switch and described first diverter switch synchronous.
4. broadband multi-antenna wireless channel measurement system as claimed in claim 3, it is characterized in that, described first controller controls described transmitting terminal and transmits with First Speed, and control described first diverter switch and switch with second speed, described second controller controls described receiving terminal with third speed Received signal strength, and control described second diverter switch and switch with the 4th speed, described First Speed is equal with described third speed, and described 4th speed is greater than described second speed.
5. broadband multi-antenna wireless channel measurement system as claimed in claim 1, it is characterized in that, described background process device comprises the characteristic extracting module in order to extract the characteristic parameter of channel according to described pure channel impulse response.
6. a broadband multi-antenna wireless channel measurement method, is characterized in that, described broadband multi-antenna wireless channel measurement method comprises the following steps:
Detectable signal is modulated the modulation signal employing time division multiplexing mode transmitting of spread spectrum generation by one end of broadband multi-antenna wireless channel;
The described modulation signal that one end that the other end of broadband multi-antenna wireless channel adopts time division multiplexing mode to receive described broadband multi-antenna wireless channel is launched, and the described modulation signal received is carried out demodulation obtain the channel impulse response after spread spectrum;
Channel impulse response after described spread spectrum is carried out despreading process and removes described one end of broadband multi-antenna wireless channel and the response of the other end to obtain pure channel impulse response by the other end of described broadband multi-antenna wireless channel.
7. broadband multi-antenna wireless channel measurement method as claimed in claim 6, it is characterized in that, described broadband multi-antenna wireless channel measurement method also comprises: the other end of described broadband multi-antenna wireless channel extracts the characteristic parameter of channel according to described pure channel impulse response.
8. broadband multi-antenna wireless channel measurement method as claimed in claim 6, it is characterized in that, detectable signal is modulated modulation signal that spread spectrum produces and is adopted time division multiplexing mode to launch specifically to comprise by one end of described broadband multi-antenna wireless channel: detectable signal is first modulated spread spectrum and produced modulation signal by one end of described broadband multi-antenna wireless channel, then described modulation signal is successively carried out amplification and filtering process, then adopt time division multiplexing mode to be launched by the described modulation signal after amplification and filtering process.
9. broadband multi-antenna wireless channel measurement method as claimed in claim 6, it is characterized in that, the other end of described broadband multi-antenna wireless channel adopts time division multiplexing mode to receive the described modulation signal of one end transmitting of described broadband multi-antenna wireless channel, and the described modulation signal received is carried out demodulation and obtain the channel impulse response after spread spectrum and specifically comprise: the described modulation signal that one end that the other end of described broadband multi-antenna wireless channel adopts time division multiplexing mode to receive described broadband multi-antenna wireless channel is launched, then the described modulation signal received successively carried out filtering and amplify process, then the described modulation signal of the reception after filtering and amplification process is carried out demodulation and obtain the sound of the channel impulse after spread spectrum.
10. broadband multi-antenna wireless channel measurement method as claimed in claim 6, it is characterized in that, channel impulse response after described spread spectrum is carried out despreading process and removes described one end of broadband multi-antenna wireless channel and the response of the other end also comprises to obtain pure channel impulse response by the other end of described broadband multi-antenna wireless channel: adopt radio frequency cable by one end of described broadband multi-antenna wireless channel and the other end direct-connected, and test obtains described one end of broadband multi-antenna wireless channel and the response of the other end.
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| CN201410306479.1A CN105281844A (en) | 2014-06-30 | 2014-06-30 | Broadband multi-antenna wireless channel measuring system and method thereof |
| PCT/CN2014/091042 WO2016000383A1 (en) | 2014-06-30 | 2014-11-13 | System and method for measuring broadband multi-antenna radio channel |
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| CN201410306479.1A CN105281844A (en) | 2014-06-30 | 2014-06-30 | Broadband multi-antenna wireless channel measuring system and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517001A (en) * | 2017-09-20 | 2017-12-26 | 重庆聚陆新能源有限公司 | A kind of DC/DC converters of restructural |
| CN111106878A (en) * | 2018-10-10 | 2020-05-05 | 川升股份有限公司 | Multiple input multiple output antenna measurement system |
| CN111505555A (en) * | 2020-03-26 | 2020-08-07 | 中国航天系统科学与工程研究院 | Non-coherent electromagnetic detection external field automatic calibration system and method |
| WO2021143649A3 (en) * | 2020-01-19 | 2023-03-30 | 荣耀终端有限公司 | Signal processing system and related electronic device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206697B (en) * | 2021-03-19 | 2023-04-18 | 中国电子科技集团公司第二十九研究所 | Broadband radio frequency receiving and processing system device and self-checking method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6037898A (en) * | 1997-10-10 | 2000-03-14 | Arraycomm, Inc. | Method and apparatus for calibrating radio frequency base stations using antenna arrays |
| CN101039497A (en) * | 2007-04-28 | 2007-09-19 | 北京邮电大学 | Method and system for measuring bandwidth channel |
| CN101243667A (en) * | 2005-06-16 | 2008-08-13 | 高通股份有限公司 | Pilot and data transmission in a MIMO system applying subband multiplexing |
| CN101478770A (en) * | 2009-02-06 | 2009-07-08 | 清华大学 | Multi-antenna measurement signal sending method for solving phase noise problem on the basis of fast switching |
| CN102299750A (en) * | 2010-06-25 | 2011-12-28 | 中兴通讯股份有限公司 | Device and method for MIMO (multiple input multiple output) test |
| CN102412917A (en) * | 2011-12-16 | 2012-04-11 | 哈尔滨工业大学深圳研究生院 | Multiple-antenna measurement system and method based on network analyzer and RF (radio frequency) switch |
| CN202424728U (en) * | 2011-12-16 | 2012-09-05 | 哈尔滨工业大学深圳研究生院 | Multi-antenna measuring system based on network analysis instrument and radio-frequency switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7254196B2 (en) * | 2002-11-26 | 2007-08-07 | Agere Systems Inc. | Symbol timing for MIMO OFDM and other wireless communication systems |
-
2014
- 2014-06-30 CN CN201410306479.1A patent/CN105281844A/en not_active Withdrawn
- 2014-11-13 WO PCT/CN2014/091042 patent/WO2016000383A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6037898A (en) * | 1997-10-10 | 2000-03-14 | Arraycomm, Inc. | Method and apparatus for calibrating radio frequency base stations using antenna arrays |
| CN101243667A (en) * | 2005-06-16 | 2008-08-13 | 高通股份有限公司 | Pilot and data transmission in a MIMO system applying subband multiplexing |
| CN101039497A (en) * | 2007-04-28 | 2007-09-19 | 北京邮电大学 | Method and system for measuring bandwidth channel |
| CN101478770A (en) * | 2009-02-06 | 2009-07-08 | 清华大学 | Multi-antenna measurement signal sending method for solving phase noise problem on the basis of fast switching |
| CN102299750A (en) * | 2010-06-25 | 2011-12-28 | 中兴通讯股份有限公司 | Device and method for MIMO (multiple input multiple output) test |
| CN102412917A (en) * | 2011-12-16 | 2012-04-11 | 哈尔滨工业大学深圳研究生院 | Multiple-antenna measurement system and method based on network analyzer and RF (radio frequency) switch |
| CN202424728U (en) * | 2011-12-16 | 2012-09-05 | 哈尔滨工业大学深圳研究生院 | Multi-antenna measuring system based on network analysis instrument and radio-frequency switch |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517001A (en) * | 2017-09-20 | 2017-12-26 | 重庆聚陆新能源有限公司 | A kind of DC/DC converters of restructural |
| CN111106878A (en) * | 2018-10-10 | 2020-05-05 | 川升股份有限公司 | Multiple input multiple output antenna measurement system |
| CN111106878B (en) * | 2018-10-10 | 2022-04-08 | 川升股份有限公司 | Multiple input multiple output antenna measurement system |
| WO2021143649A3 (en) * | 2020-01-19 | 2023-03-30 | 荣耀终端有限公司 | Signal processing system and related electronic device |
| CN111505555A (en) * | 2020-03-26 | 2020-08-07 | 中国航天系统科学与工程研究院 | Non-coherent electromagnetic detection external field automatic calibration system and method |
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|---|---|
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