CN103888196A - Two-way mobile communication environment simulation system - Google Patents
Two-way mobile communication environment simulation system Download PDFInfo
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- CN103888196A CN103888196A CN201310148919.0A CN201310148919A CN103888196A CN 103888196 A CN103888196 A CN 103888196A CN 201310148919 A CN201310148919 A CN 201310148919A CN 103888196 A CN103888196 A CN 103888196A
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Abstract
The invention provides a two-way mobile communication environment simulation system. According to the system provided by the invention, a main control unit carries out model parameter determining based on the acquired model parameters used for simulating the environment of a space channel, so as to determine the parameters of fading conditions of the environment of an uplink/downlink channel; a control command which is used for channel environment simulation switching is generated based on the acquired configuration parameters of an uplink/downlink subframe and an externally input frame synchronization signal; under the control of the control command, the system receives multiple input signals from the corresponding channels through an input interface and carries out processing; corresponding complex baseband signals are provided and transmitted to a multi-antenna wireless environment simulation unit; independent multipath fading coefficients are generated based on the parameters of the fading conditions; channel environment fading simulation is carried out on the complex baseband signals provided by the input interface based on the multipath fading coefficients, so as to acquire faded complex baseband signals; and an output interface processes multiple baseband signals and outputs the signals to the corresponding channels.
Description
Technical field
The present invention relates to a kind of channel simulation system in the communications field, particularly relate to a kind of bidirectional mobile communication environmental simulation system of many antennas.
Background technology
In recent years, the growth at full speed of mobile broadband wireless communication service, has higher requirement to the performance of wireless communication system.The wireless communication system of a new generation has been introduced series of new techniques, to obtain higher systematic function, also makes the research of wireless channel and legacy wireless communication system Research on Channel have very large difference simultaneously.
The performance of system of broadband wireless communication depends on the fading characteristic of wireless channel to a great extent, therefore the research of electric wave propagation characteristic has been become to the basis of Communication System Design and the place of key.Understand real channel feature, set up rationally, the wireless communication system in wireless channel model, broadband efficient for design accurately, signal processing algorithm reasonable in design, and the network optimization all has great directive function.
All many-sided challenges such as next generation mobile communication network faces broadband, spectral efficient, low time delay, environmental protection and energy saving.Wireless mobile channel is deeply understood and modeling is the design premises condition of wide-band mobile communication system.In the design and development process of practical communication system, need to consider as soon as possible the feature of wireless channel.Adopt at present software to carry out channel simulator, but, being limited to processing speed and the memory space of computer, this emulation mode only limits to single channel, and very consuming time, and only can be in system design phase in early stage application.Cannot provide the simulated environments such as real-time debug in the design process of whole system for the simulation of mobile environment in real time.Therefore, need to improve existing channel simulation system.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of bidirectional mobile communication environmental simulation system, and the problem of more real multiple wireless channel circumstance cannot be provided for solving prior art channel simulation system.
For achieving the above object and other relevant objects, the invention provides a kind of bidirectional mobile communication environmental simulation system, it at least comprises: main control unit, for the fade condition parameter of determining corresponding uplink/downlink channel circumstance for simulating the model parameter of uplink/downlink space channel environment based on obtained, and the up/down row sub-frame configuration parameter based on obtained and the control command of simulating for switching uplink/downlink channel circumstance from the frame frame synchronizing signal generation of outside input, and adjust the synchronous sequence in described analogue system based on described frame synchronizing signal; The input interface of access uplink/downlink channel, for receiving and process from the multichannel uplink/downlink input signal of corresponding uplink/downlink channel based on described control command, so that corresponding uplink/downlink complex baseband signal to be provided; Multi-antenna wireless environmental simulation unit, for under the control of described control command, generate independently multipath fading coefficient based on described fade condition parameter, and the uplink/downlink complex baseband signal described input interface being provided based on described multipath fading coefficient carries out the decline simulation of channel circumstance, obtain the uplink/downlink complex baseband signal after decline; The output interface of access uplink/downlink channel, for exporting uplink/downlink baseband signal described in multichannel to corresponding uplink/downlink channel based on described control command after processing.
Preferably, described main control unit is also for generate the list of different structure according to the kind of generated fade condition parameter, and provides corresponding list according to described control command to described multi-antenna wireless environmental simulation unit.
Preferably, described multi-antenna wireless environmental simulation unit comprises: independent fading coefficients generation module, for under the control of described main control unit, under the sample rate lower than described input signal, adopt time-multiplexed mode produce successively for normalized each footpath of analog channel environment time become fading coefficients, wherein, each footpath time become fading coefficients and be mutually independent.
Preferably, described multi-antenna wireless environmental simulation unit comprises: multipath power division and inter-channel correlation module, for by normalized each footpath time become the multidiameter delay power spectrum of fading coefficients and described fade condition parameter and correlation matrix carries out power division and correlation loads, and become fading coefficients while exporting the multipath lower than each channel of the sample rate of described input signal.
Preferably, described multi-antenna wireless environmental simulation unit comprises: multipath fading coefficient interpolator group, the sample rate that becomes fading coefficients when by described multipath is increased to the sample rate of the complex baseband signal of input.
Preferably, described multi-antenna wireless environmental simulation unit comprises: channel model group, for forming channel model matrix according to signal input quantity and the output quantity for the treatment of simulated environment, during by the multipath of described uplink/downlink complex baseband signal and the described multipath fading coefficient interpolator group output of input, becoming fading coefficients carries out convolution algorithm and obtains multiple subchannels declines and export, then optionally subchannel is merged, with the complex baseband signal after being declined accordingly.
Preferably, described channel model group comprises multiple subchannel filter, each subchannel filter is simulated in many antenna environment, dual-mode antenna between multipath channel environment, each described subchannel filter is carried out cascade based on described fade condition parameter, to provide multipath quantity to be greater than the channel circumstance of preset value.
As mentioned above, bidirectional mobile communication environmental simulation system of the present invention, there is following beneficial effect: the mode that adopts main control unit control inputs interface, multi-antenna wireless environmental simulation unit and output interface to change in various transmission options and radio environment, can simulate really by the mode of flexible change model parameter the multipath fading process of the channel under multi-channel wireless ring; In addition, the present invention becomes fading coefficients while first generating the multipath of low sampling rate, during again by multipath, becoming fading coefficients, to obtain sample rate by interpolation processing identical with the sample rate of received uplink/downlink complex baseband signal, by choose reasonable low sampling rate value and sample rates values, can be without multiplier, resource overhead is little.
Brief description of the drawings
Fig. 1 is shown as the structural representation of bidirectional mobile communication environmental simulation system of the present invention.
Fig. 2 is shown as the structural representation of multi-antenna wireless environmental simulation unit in bidirectional mobile communication environmental simulation system of the present invention.
Fig. 3 is shown as the basic structure schematic diagram of the multipath power division in multi-antenna wireless environmental simulation unit and inter-channel correlation module in bidirectional mobile communication environmental simulation system of the present invention.
Fig. 4 is shown as the structural representation of a kind of optimal way of bidirectional mobile communication environmental simulation system of the present invention.
Element numbers explanation
1 bidirectional mobile communication environmental simulation system
11 input interfaces
111 descending input interfaces
112 up input interfaces
113 input handover modules
12 main control units
13 multi-antenna wireless environmental simulation unit
131 independent fading coefficients generation modules
132 multipath power division and inter-channel correlation module
133 multipath fading coefficient interpolator groups
134 channel model groups
135 Gaussian white noise generators
136 noise synthesis modules
14 output interfaces
141 descending output interfaces
142 up output interfaces
143 output switching modules
Embodiment
By particular specific embodiment explanation embodiments of the present invention, person skilled in the art scholar can understand other advantages of the present invention and effect easily by the disclosed content of this specification below.
Refer to Fig. 1 to Fig. 4.Notice, appended graphic the illustrated structure of this specification, ratio, size etc., all contents in order to coordinate specification to disclose only, understand and read for person skilled in the art scholar, not in order to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, not affecting under effect that the present invention can produce and the object that can reach, all should still drop on disclosed technology contents and obtain in the scope that can contain.
As shown in Figure 1, the invention provides a kind of bidirectional mobile communication environmental simulation system, for the simulated environment of bidirectional mobile communication is provided, can provide for mobile communication product the test environment of the bidirectional mobile communication of simulation.
Described analogue system 1 comprises: main control unit 12, input interface 11, multi-antenna wireless environmental simulation unit 13, output interface 14.
Described main control unit 12 is for based on obtained fade condition parameter of carrying out model parameter and determine uplink/downlink channel circumstance for simulating the model parameter of uplink/downlink space channel environment, and up/down row sub-frame configuration parameter based on obtained and generate the control command for switching the simulation of uplink/downlink channel circumstance from the frame synchronizing signal of base station.And adjust the synchronous sequence in described analogue system based on described frame synchronizing signal.
Wherein, describedly can set according to default space channel environmental model for the model parameter of simulating uplink/downlink space channel environment, described in the present embodiment, be set by host computer or test subscriber according to default model framework for the parameter of simulating uplink/downlink space channel environment.Describedly include but not limited to for the parameter of simulating uplink/downlink space channel environment: the correlation models between model, the Uplink/Downlink channel circumstance model of virtual space channel circumstance and the corresponding parameter of described model, the quantity of uplink/downlink complex baseband signal, equally distributed random parameter, multidiameter delay power spectrum, noise parameter etc.Wherein, the correlation models between the model of described virtual space channel circumstance and Uplink/Downlink channel circumstance model comprises: the model of independent uplink, the model of independent downlink transfer, carry out the alternately model of transmission (as the model of reciprocity transmission etc.) of uplink and downlink according to default temporal correlation rule.Described up/down row sub-frame configuration parameter comprises: subframe (time slot) config option of uplink/downlink transmission etc.
Particularly, described main control unit 12 obtains by host computer or user inputs for simulating model parameter and the up/down row sub-frame configuration parameter of uplink/downlink space channel environment, and to carry out necessary parameter conversion for the parameter of simulating uplink/downlink space channel environment, or the obtained each parameter for simulating uplink/downlink space channel environment is carried out to preliminary treatment, meet the required parameter of model initialization to convert to, the each parameter that recycles described simulation uplink/downlink space channel environment is determined correlation and the required correlation matrix of multipath fading weighting in Uplink/Downlink channel circumstance space, be formed for the fade condition parameter of real-time up/down row decline simulation,
Meanwhile, in the uplink/downlink subframe time slot that described main control unit 12 also provides in up/down row sub-frame configuration parameter, obtain the frame synchronizing signal from the subframe (or time slot) of outside input (as obtained from base station side), to generate the control command of corresponding simulation upstream or downstream environment decline, wherein, described frame synchronizing signal is obtained by frame synchronization (slot synchronization) signal input interface (not giving diagram) in described main control unit 12, it is synchronous that described main control unit 12 also carries out system-frame according to this frame synchronizing signal, to carry out correct sequencing control.
Such as, the various parameters that described main control unit 12 obtains comprise: subframe (time slot) config option of uplink/downlink transmission, uplink and downlink replace mode, the time dependent parameter of uplink/downlink channel circumstance, when multipath, become the space correlation parameter of fading coefficients, described main control unit 12 obtains the frame synchronizing signal from base station in the subframe (time slot) of described uplink/downlink transmission configure time interval of the uplink/downlink switching of choosing, and based on described frame synchronizing signal, corresponding control command is exported in other unit (or module) in described system 1, so that other unit (or module) simulates the decline situation of corresponding upstream or downstream space environment based on described control command, and according to the time dependent parameter of uplink/downlink channel circumstance, the space correlation parameter etc. that becomes fading coefficients when multipath is calculated the correlation matrix for the simulation of space channel spatial coherence, formation corresponds respectively to the fade condition parameter of up link and down link environment, and it is synchronous to carry out system-frame.
Preferably, described main control unit 12 generates the list of different structure according to the kind of generated fade condition parameter, and provides corresponding list according to described control command to described multi-antenna wireless environmental simulation unit 13.
Particularly, described main control unit 12 obtains the different model parameters of the multiple fade condition of user configured sign, and described fade condition is carried out generating multiple lists after preliminary treatment, described in the time of simulation, multi-antenna wireless environmental simulation unit 13, by the different list of access, carries out the real-time switching of multiple fade condition.
Described input interface 11 accesses uplink/downlink mobile channel, for receiving and process from the multichannel uplink/downlink input signal of corresponding uplink/downlink channel based on described control command, so that corresponding uplink/downlink complex baseband signal to be provided.
Particularly, described input interface 11 comprises: up input interface 111, descending input interface 112 and uplink/downlink input handover module 113.
The input signal of described up input interface 111 and the corresponding reception multichannel up link of descending input interface 112 and down link also converts corresponding uplink/downlink complex baseband signal to and is exported.
Concrete, described up input interface 111 and descending input interface 112 share or each self-contained down-converted module, receiving after the input signal of multichannel uplink/downlink of uplink/downlink channel, received input signal is carried out to down-converted, to obtain corresponding uplink/downlink complex baseband signal and to be exported.
Described uplink/downlink input handover module 113 is for switching and select up input interface 111 or the complex baseband signal that descending input interface 112 is exported of described input interface 11 to transport to described multi-antenna wireless environmental simulation unit 13 according to the control command of described main control unit 12.
For example, described control command is upload control instruction, described uplink/downlink input handover module 113 will be connected described up input interface 111, and the up complex baseband signal that described up input interface 111 is obtained is transported to described multi-antenna wireless environmental simulation unit 13.
Described multi-antenna wireless environmental simulation unit 13 is under the control of described control command, generate independently multipath fading coefficient based on described fade condition parameter, and the uplink/downlink complex baseband signal described input interface 11 being provided based on described multipath fading coefficient carries out the decline simulation of channel circumstance, obtain the uplink/downlink complex baseband signal after decline.So, realize the two-way environment simulation of TDD system 1.
Particularly, the model of pre-established space channel environment is selected in described multi-antenna wireless environmental simulation unit 13 according to described control command, and become fading coefficients while generating in real time the multipath of each channel, while obtaining corresponding correlation matrix and described multipath again from the pretreated fade condition parameter list of described main control unit 12, becoming fading coefficients carries out matrix operation and becomes fading coefficients when obtaining the multipath of final simulating multi-path fading environment, so can construct in real time the time varying channel matrix that characterizes Real-time Channel environment, the complex baseband signal and this channel matrix that described input interface 11 are provided carry out real-time operation again, to obtain the complex baseband signal after decline.
Wherein, the input and output quantity of spatial Channel Model (antenna amount of the transmitting/receiving in corresponding multiaerial system 1) can be identical, also can be different.For example, in practical communication system 1, the antenna amount of base station is M, the antenna amount of travelling carriage is N, the quantity that can configure the up complex baseband signal of input is that the quantity of the descending complex baseband signal of N (number of transmission antennas of travelling carriage), input is M (number of transmission antennas of base station), and the output quantity of the up complex baseband signal after the decline after described multi-antenna wireless environmental simulation unit 13 simulation process is that M (the reception antenna quantity of base station), descending complex baseband signal are output as N (the reception antenna quantity of travelling carriage).
In the present embodiment, as shown in Figure 2, described multi-antenna wireless environmental simulation unit 13 comprises: independent fading coefficients generation module 131, multipath power division and inter-channel correlation module 132, multipath fading coefficient interpolator group 133, channel model group 134, Gaussian white noise generator 135, noise synthesis module 136.
Described independent fading coefficients generation module 131 is under the control at described main control unit 12, lower than input signal sample rate (F
s) sample rate
the mode of lower employing time-division produce successively for normalized each footpath of analog channel environment time become fading coefficients, wherein, each footpath time become fading coefficients and be mutually independent.
Particularly, described independent fading coefficients generation module 131 is at low sampling rate
the lower equally distributed random parameter that described fade condition parameter list provides, the input signal quantity M(uplink/downlink complex baseband signal quantity of emulation moment channel model utilized) and descending/up complex baseband signal quantity of output signal quantity N(), utilize each footpath that random fading model (as Jakes model common in document and multiple improved model thereof) based on sine-wave superimposed method generates M*N sub-channels successively independently to become fading coefficients when normalization.The multipath tap number of supposing every sub-channels is L, and the fading coefficients in final each moment generating can form the matrix H of M × N × L
ω, wherein corresponding multipath tap l (l=0,1 ..., L-1) M × N matrix H that declines
ω(l) sample rate is
wherein, sine wave can adopt the mode of Direct Digital frequency synthesis (DDS) to generate in the mode of look-up table, to improve formation speed.In the situation that hardware resource allows, when each footpath described, become fading coefficients and also can adopt formed filter method or IFFT method to realize.
Described multipath power division and inter-channel correlation module 132 are for by sample rate being
normalized each footpath time become multidiameter delay power spectrum in fading coefficients and described fade condition parameter and correlation matrix carries out power division and correlation loads, and output is lower than the sample rate of described input signal
the multipath of each subchannel time become fading coefficients.
Particularly, as shown in Figure 3.Described multipath power division and inter-channel correlation module 132, first according to the multidiameter delay power spectrum in described fade condition parameter list, to the sample rate of input are
each footpath fading coefficients matrix H
ω(l) carry out power division, obtain the matrix H of the M × N after this footpath power weightings
ω' (l), wherein H
ω(l) be above-mentioned matrix H
ωthe matrix of M × N of middle corresponding multipath tap l.Concrete, if in fade condition parameter list in multidiameter delay power spectrum the average power of corresponding multipath tap l be P
l,
after power division, further obtain the channel matrix H that comprises information between multi-antenna space (l) corresponding to multipath tap l by matrix operation,
wherein R
txthe input correlation matrix of channel during for sky, R
rxfor output correlation matrix.This process is matrix operation, and the sample rate of the channel matrix H (l) in the each footpath of correspondence of output is still
the sample rate that described multipath fading coefficient interpolator group 133 becomes fading coefficients when by described multipath is increased to the sample rate of the complex baseband signal of input.
Particularly, for realizing the convolution of baseband signal and fading coefficients, need be by the fading coefficients of decline matrix H (l) corresponding each footpath by low sampling rate
inside be inserted to the sample rate F of baseband signal
son.Therefore the interpolater that comprises the high interpolation ratio of multichannel in described multipath fading coefficient interpolator group 133, becomes the conversion of fading coefficients to input baseband signal sample rate when completing low sampling rate multipath.The low sampling rate in every footpath of every sub-channels time become fading coefficients and be all accomplished to by interpolater the conversion of signal sampling rate.Described interpolater is preferably linear interpolation.
Described channel model group 134 is for forming channel model matrix according to signal input quantity and the output quantity for the treatment of simulated environment, described uplink/downlink complex baseband signal and the described multipath fading coefficient interpolator group 133 of input are exported multipath time become fading coefficients and carry out convolution algorithm and obtain multiple subchannels declines and export, then optionally subchannel is merged, with the complex baseband signal after being declined accordingly.
Concrete, when multipath that described channel model group 134 is exported the described uplink/downlink complex baseband signal of input and described multipath fading coefficient interpolator group 133, become that fading coefficients is carried out convolution algorithm and multiple subchannel merges, with the complex baseband signal after being declined accordingly.
Wherein, described channel model group 134 comprises multiple subchannel filter, each subchannel filter is simulated in many antenna environment, dual-mode antenna between channel circumstance, preferably, each described subchannel filter is carried out cascade based on described fade condition parameter, to provide multipath quantity to be greater than the channel circumstance of preset value.
Multiple subchannel filter form subchannel filter matrix, and the row/column of described subchannel filter matrix is determined according to the channel model input and output quantity in emulation moment.For example, the input quantity of current channel model is M, output quantity is N, and described subchannel filter matrix is that M is capable, N row, altogether M*N sub-channels filter, the corresponding identical Yi road complex radical tape input of N sub-channels filter of every a line, the corresponding M road complex radical tape input of the capable subchannel filter of M like this, the decline of the M sub-channels filter of every row is exported after linear combining, the fading signal of a corresponding road output, like this, N complex baseband signal of output after the corresponding decline of N row subchannel filter.
Preferably, each channel model that forms channel model matrix in described channel model group 134 adopts the tapped delay line structure of FIR filter to realize, each subchannel filter is controlled by the independent of described main control unit 12, to realize the control to particular sub-channel.
Such as, utilize in the described channel model group 134 in described fade condition parameter list particular sub-channel invalid, realize between each input signal separate.Multiple inputoutput pairs can be configured to organizes independently channel more, also can under the control of described main control unit 12, be configured to have the channel of correlation.As a kind of prioritization scheme of described channel model group 134, wherein, the tapped delay line structure of each subchannel filter is replaceable is Farrow structure, to realize mark time delay, further improves the multi-path resolved power of wireless environment simulation.
More preferably, in order to simulate more accurately multichannel environment, the each channel model in described channel model group 134 also comprises multiple RAM of cascade.
Described RAM is for providing the time delay of analog channel environment.
Particularly, for the simulation of broadband wireless signal environment, general multidiameter delay resolving power is higher, completes the time delay of input signal for a large amount of register resources of simulation needs compared with the multipath of long delay, the memory effect of analog wireless channel, and resource overhead is large.In the present embodiment, adopt large capacity RAM to realize the time delay of input signal, can, the in the situation that of higher time delay resolving power, realize the simulation of long delay multipath component.
Described noise synthesis module 136 is for the white noise of artificial antenna environment, and the complex baseband signal that described white noise is added to after decline.Wherein, described noise synthesis module 136 comprises: Gaussian white noise generator 135 and noise mixer.
Described Gaussian white noise generator 135 is for generating the white Gaussian noise of unit power.
The uplink/downlink complex baseband signal that described noise mixer is added to after decline after the white Gaussian noise of described unit power being weighted for the noise parameter providing according to described fade condition parameter list.
Described output interface 14 accesses uplink/downlink channel, after described uplink/downlink complex baseband signal being processed based on described control command, exports corresponding uplink/downlink channel to.
Particularly, described output interface 14 comprises: up output interface 142, descending output interface 141 and uplink/downlink output switching module 143.
Intermediate frequency or radiofrequency signal that described up output interface 142 and descending output interface 141 convert the uplink/downlink complex baseband signal after decline to corresponding multichannel Uplink/Downlink export in corresponding uplink/downlink channel.
Concrete, described up output interface 142 and descending output interface 141 share or each self-contained upconversion process module, after the uplink/downlink complex baseband signal receiving after decline, received complex baseband signal is carried out to upconversion process, to obtain intermediate frequency or the radiofrequency signal of corresponding multichannel Uplink/Downlink and to be exported.
Described uplink/downlink output switching module 143 is for switching and select described up output interface 142 or descending output interface 141 according to the control command of described main control unit 12, so that the complex baseband signal after decline is carried out to upconversion process and transmitting.
For example, described control command is upload control instruction, described uplink/downlink output switching module 143 will be connected described descending output interface 141, make the complex baseband signal that multi-antenna wireless environmental simulation unit 13 is exported described in described descending output interface 141 carry out upconversion process and be sent in down channel, to be sent to terminal.
As shown in Figure 4, the course of work of described analogue system 1 is as follows:
The control interface configurations Uplink/Downlink subframe time that tester provides according to main control unit 12, and be configured for respectively the model parameter of simulation uplink/downlink space channel environment, described main control unit 12 generates the multidiameter delay power weightings coefficient for multipath fading processing according to described parameter, the fade condition parameters such as the correlation matrix of spatial coherence processing, and described fade condition parameter is encapsulated in fade condition parameter list, and obtain the frame synchronizing signal of base station according to the Uplink/Downlink subframe time, in the time obtaining described frame synchronizing signal, export fade condition parameter list and the control command of corresponding upstream or downstream link, described input interface 11 receives the input signal from respective channel according to described control command, and convert input signal to complex baseband signal, and offer described multi-antenna wireless environmental simulation unit 13, described multi-antenna wireless environmental simulation unit 13 is receiving after fade condition parameter list and control command, by independent fading coefficients generation module 131 according to the parameter providing in fade condition parameter list adopt time-multiplexed mode produce successively for the normalization of analog channel environment and independently each footpath time become fading coefficients, described multipath power division and inter-channel correlation module 132 according to each footpath time become fading coefficients and carry out power division and correlation according to described fade condition parameter list and load, become fading coefficients when obtaining the multipath of each channel with spatial coherence, the sample rate that is become again fading coefficients by multipath fading coefficient interpolator group 133 during by described multipath is increased to the sample rate of the complex baseband signal of input, formed channel model matrix by channel model group 134 according to signal input quantity and the output quantity for the treatment of simulated environment, described uplink/downlink complex baseband signal and the described multipath fading coefficient interpolator group 133 of input are exported multipath time become fading coefficients and carry out convolution algorithm and obtain multiple subchannels declines and export, then optionally subchannel is merged, with the complex baseband signal after being declined accordingly, after reloading noise, transport to output interface 14, complex baseband signal after simulation decline is carried out to upward frequency conversion and is sent in respective channel according to control command by output interface 14 again.
In sum, bidirectional mobile communication environmental simulation system of the present invention, generate corresponding fade condition parameter list by main control unit according to input simulated environmental parameters, and the frame synchronizing signal of obtaining base station in the time of the upstream or downstream time slot providing with uplink/downlink sub-frame configuration parameter is to generate the control command of control inputs interface, multi-antenna wireless environmental simulation unit and output interface, can simulate really by the mode of flexible change model parameter the multipath fading process of the channel under multi-channel wireless ring; In addition, this independent fading coefficients generation module becomes fading coefficients while generating the multipath of low sampling rate, during again by multipath, becoming fading coefficients, to obtain sample rate by interpolation processing identical with the sample rate of received uplink/downlink complex baseband signal, by choose reasonable low sampling rate value and sample rates values, can be without multiplier, resource overhead is little; In addition, the present invention is due to radio wave propagation characteristic that can many antennas of Reality simulation mobile environment, be particularly useful for the up/down row two-way environment simulation of TDD system, for providing actual many antennas, the system in new generation broadband mobile communication technology and system debug, measurement move the simulation of propagating scene, for design, checking and the optimization of system of broadband wireless communication provide foundation.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (7)
1. a bidirectional mobile communication environmental simulation system, is characterized in that, at least comprises:
Main control unit, for the fade condition parameter of determining corresponding uplink/downlink channel circumstance for simulating the model parameter of uplink/downlink space channel environment based on obtained, and the up/down row sub-frame configuration parameter based on obtained and the control command of simulating for switching uplink/downlink channel circumstance from the frame frame synchronizing signal generation of outside input, and adjust the synchronous sequence in described analogue system based on described frame synchronizing signal;
The input interface of access uplink/downlink channel, for receiving and process from the multichannel uplink/downlink input signal of corresponding uplink/downlink channel based on described control command, so that corresponding uplink/downlink complex baseband signal to be provided;
Multi-antenna wireless environmental simulation unit, for under the control of described control command, generate independently multipath fading coefficient based on described fade condition parameter, and the uplink/downlink complex baseband signal described input interface being provided based on described multipath fading coefficient carries out the decline simulation of channel circumstance, obtain the uplink/downlink complex baseband signal after decline;
The output interface of access uplink/downlink channel, for exporting uplink/downlink baseband signal described in multichannel to corresponding uplink/downlink channel based on described control command after processing.
2. bidirectional mobile communication environmental simulation system according to claim 1, it is characterized in that, described main control unit is also for generate the list of different structure according to the kind of generated fade condition parameter, and provides corresponding list according to described control command to described multi-antenna wireless environmental simulation unit.
3. bidirectional mobile communication environmental simulation system according to claim 1, it is characterized in that, described multi-antenna wireless environmental simulation unit comprises: independent fading coefficients generation module, for under the control of described main control unit, under the sample rate lower than described input signal, adopt time-multiplexed mode produce successively for normalized each footpath of analog channel environment time become fading coefficients, wherein, each footpath time become fading coefficients and be mutually independent.
4. bidirectional mobile communication environmental simulation system according to claim 3, it is characterized in that, described multi-antenna wireless environmental simulation unit comprises: multipath power division and inter-channel correlation module, for by normalized each footpath time become the multidiameter delay power spectrum of fading coefficients and described fade condition parameter and correlation matrix carries out power division and correlation loads, and become fading coefficients while exporting the multipath lower than each channel of the sample rate of described input signal.
5. bidirectional mobile communication environmental simulation system according to claim 4, it is characterized in that, described multi-antenna wireless environmental simulation unit comprises: multipath fading coefficient interpolator group, the sample rate that becomes fading coefficients when by described multipath is increased to the sample rate of the complex baseband signal of input.
6. bidirectional mobile communication environmental simulation system according to claim 5, it is characterized in that, described multi-antenna wireless environmental simulation unit comprises: channel model group, for forming channel model matrix according to signal input quantity and the output quantity for the treatment of simulated environment, during by the multipath of described uplink/downlink complex baseband signal and the described multipath fading coefficient interpolator group output of input, becoming fading coefficients carries out convolution algorithm and obtains multiple subchannels declines and export, then optionally subchannel is merged, with the complex baseband signal after being declined accordingly.
7. bidirectional mobile communication environmental simulation system according to claim 1, it is characterized in that, described channel model group comprises multiple subchannel filter, each subchannel filter is simulated in many antenna environment, dual-mode antenna between multipath channel environment, each described subchannel filter is carried out cascade based on described fade condition parameter, to provide multipath quantity to be greater than the channel circumstance of preset value.
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| CN111294120A (en) * | 2020-04-02 | 2020-06-16 | 上海创远仪器技术股份有限公司 | Logic circuit structure system for realizing uplink and downlink consistency of channel simulator |
| CN114244460A (en) * | 2021-12-17 | 2022-03-25 | 中国人民解放军国防科技大学 | Heterogeneous accelerated multi-path channel signal real-time generation method |
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| CN114244460A (en) * | 2021-12-17 | 2022-03-25 | 中国人民解放军国防科技大学 | Heterogeneous accelerated multi-path channel signal real-time generation method |
| CN114244460B (en) * | 2021-12-17 | 2023-01-03 | 中国人民解放军国防科技大学 | Heterogeneous accelerated multi-path channel signal real-time generation method |
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