CN103888196B - Bidirectional mobile communication environmental simulation system - Google Patents
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- CN103888196B CN103888196B CN201310148919.0A CN201310148919A CN103888196B CN 103888196 B CN103888196 B CN 103888196B CN 201310148919 A CN201310148919 A CN 201310148919A CN 103888196 B CN103888196 B CN 103888196B
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Abstract
The invention provides a kind of bidirectional mobile communication environmental simulation system.According to system of the present invention, carried out the fade condition parameter of model parameter determination uplink/downlink channel circumstance based on the obtained model parameter for virtual space channel circumstance by main control unit, and generate the control command for switching channels environmental simulation based on obtained uplink/downlink sub-frame configuration parameter and from the frame synchronizing signal of outside input, described system is under the control of described control command, the multichannel input signal received from respective channel by input interface processes, and corresponding complex baseband signal will be provided to transport to multi-antenna wireless environmental simulation unit, it generates independently multipath fading coefficient based on described fade condition parameter, and based on described multipath fading coefficient, the complex baseband signal that described input interface provides is carried out to the decline simulation of channel circumstance, obtain the complex baseband signal after declining, export in corresponding channel after baseband signal described in multichannel being processed by output interface.
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 multiple 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 introduces series of new techniques, to obtain higher systematic function, and the very large difference that simultaneously also made the research of wireless channel and legacy wireless communication system Research on Channel have.
The performance of system of broadband wireless communication depends on the fading characteristic of wireless channel to a great extent, has therefore become the basis of Communication System Design and the place of key to the research of electric wave propagation characteristic.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 deeply to be 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 the feature considering wireless channel as soon as possible.Current employing software carries out channel simulator, but be limited to processing speed and the memory space of computer, this emulation mode is only limitted to single channel, and very consuming time, and only can in system design phase in early stage application.The simulated environments such as real-time debug cannot be provided in the design process of whole system for the simulation of real-time mobile environment.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, cannot provide the problem of more real multiple wireless channel circumstance for solving channel simulation system in prior art.
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 based on the obtained fade condition parameter determining corresponding uplink/downlink channel circumstance for the model parameter simulating uplink/downlink space channel environment, and generate the control command for switching the simulation of uplink/downlink channel circumstance based on obtained uplink/downlink sub-frame configuration parameter and from the frame frame synchronizing signal 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, processes for the multichannel uplink/downlink input signal received from corresponding uplink/downlink channel based on described control command, to provide corresponding uplink/downlink complex baseband signal; Multi-antenna wireless environmental simulation unit, for under the control of described control command, independently multipath fading coefficient is generated based on described fade condition parameter, and based on described multipath fading coefficient, the uplink/downlink complex baseband signal that described input interface provides is carried out to the decline simulation of channel circumstance, obtain the uplink/downlink complex baseband signal after declining; The output interface of access uplink/downlink channel, for exporting to uplink/downlink baseband signal described in multichannel after processing in corresponding uplink/downlink channel based on described control command.
Preferably, described main control unit also for generating 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 coefficient generation module, for under the control of described main control unit, under the sample rate lower than described input signal, adopt time-multiplexed mode to produce the Time-varying fading coefficient in the normalized each footpath for analog channel environment successively, wherein, the Time-varying fading coefficient in each footpath is mutually independent.
Preferably, described multi-antenna wireless environmental simulation unit comprises: multipath power distributes and inter-channel correlation module, for by the multidiameter delay power spectrum in the Time-varying fading coefficient in normalized each footpath and described fade condition parameter and correlation matrix carries out power division and correlation loads, and export the multipath Time-varying fading coefficient 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, for the sample rate of described multipath Time-varying fading coefficient being 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 the signal input quantity and output quantity for the treatment of simulated environment, the described uplink/downlink complex baseband signal of input and the multipath Time-varying fading coefficient that exports of described multipath fading coefficient interpolator group are carried out convolution algorithm to obtain multiple subchannel and decline and export, then optionally sub-channel merges, with the complex baseband signal after being declined accordingly.
Preferably, described channel model group comprises multiple subchannel filter, in each subchannel filter simulation multiple antennas environment, dual-mode antenna between multi-path channel environment, each described subchannel filter carries out cascade based on described fade condition parameter, with the channel circumstance providing multipath number to be greater than preset value.
As mentioned above, bidirectional mobile communication environmental simulation system of the present invention, there is following beneficial effect: the mode adopting main control unit control inputs interface, multi-antenna wireless environmental simulation unit and output interface to change in various transmission option and radio environment, the multipath fading process of the channel under multi-channel wireless ring can be simulated by the mode changing model parameter flexibly really; In addition, the present invention first generates the multipath Time-varying fading coefficient of low sampling rate, again multipath Time-varying fading coefficient is obtained sample rate by interpolation process identical with the sample rate of received uplink/downlink complex baseband signal, by choose reasonable low sampling rate value and sample rates values, can without the need to multiplier, resource overhead is little.
Accompanying drawing explanation
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 multipath power in bidirectional mobile communication environmental simulation system of the present invention in multi-antenna wireless environmental simulation unit and distributes and the basic structure schematic diagram of inter-channel correlation module.
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 coefficient generation modules
132 multipath power distribute 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, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Refer to Fig. 1 to Fig. 4.Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, content all only in order to coordinate specification to disclose, understand for person skilled in the art scholar and read, and be not used 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, do not affecting under effect that the present invention can produce and the object that can reach, still all should 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 providing the simulated environment of bidirectional mobile communication, the test environment of the bidirectional mobile communication of simulation can be provided for mobile communication product.
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 for based on the obtained fade condition parameter of carrying out model parameter determination uplink/downlink channel circumstance for the model parameter simulating uplink/downlink space channel environment, and generates the control command for switching the simulation of uplink/downlink channel circumstance based on obtained uplink/downlink sub-frame configuration parameter and from the frame synchronizing signal of base station.And adjust the synchronous sequence in described analogue system based on described frame synchronizing signal.
Wherein, the described model parameter for simulating uplink/downlink space channel environment can set according to the space channel environmental model preset, and the parameter for simulating uplink/downlink space channel environment described in the present embodiment is set by host computer or test subscriber according to the model framework preset.The described parameter for simulating uplink/downlink space channel environment includes but not limited to: the correlation models between the model of virtual space channel circumstance, Uplink/Downlink channel circumstance model and the corresponding parameter, the quantity of uplink/downlink complex baseband signal, equally distributed random parameter, multidiameter delay power spectrum, noise parameter etc. of described model.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 model (model etc. as reciprocity transmission) of uplink and downlink alternate transport according to the temporal correlation rule preset.Described uplink/downlink sub-frame configuration parameter comprises: subframe (time slot) config option etc. of uplink/downlink transmission.
Particularly, described main control unit 12 is obtained by host computer or model parameter and the uplink/downlink sub-frame configuration parameter of user's input for simulating uplink/downlink space channel environment, and necessary Parameter Switch is carried out to the parameter for simulating uplink/downlink space channel environment, or for each parameter simulating uplink/downlink space channel environment, preliminary treatment is carried out to obtained, to convert the parameter met needed for model initialization to, the each parameter recycling described simulation uplink/downlink space channel environment is to determine the correlation matrix needed for the correlation in Uplink/Downlink channel circumstance space and multipath fading weighting, form the fade condition parameter being used for real-time uplink/downlink decline simulation,
Meanwhile, the frame synchronizing signal of the subframe (or time slot) from outside input (as obtained from base station side) is obtained in the described main control unit 12 uplink/downlink subframe time slot that also row sub-frame configuration parameter provides over/under, 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, described main control unit 12 also carries out system-frame synchronously, to carry out correct sequencing control according to this frame synchronizing signal.
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 alternate transport model, the time dependent parameter of uplink/downlink channel circumstance, the space correlation parameter of multipath Time-varying fading coefficient, the subframe (time slot) that then described main control unit 12 transmits at described uplink/downlink to configure in time interval that the uplink/downlink chosen switches acquisition from the frame synchronizing signal of base station, and based on described frame synchronizing signal corresponding control command exported in other unit (or module) in described system 1, the fading profiles of corresponding upstream or downstream space environment is simulated based on described control command to make other unit (or module), and according to the time dependent parameter of uplink/downlink channel circumstance, the space correlation parameters of multipath Time-varying fading coefficient etc. calculate the correlation matrix being used for the simulation of space channel spatial coherence, form the fade condition parameter corresponding respectively to up link and downlink context, 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 generate multiple list after preliminary treatment is carried out to described fade condition, when simulating, described multi-antenna wireless environmental simulation unit 13 is by accessing different lists, carries out the real-time switching of multiple fade condition.
Described input interface 11 accesses uplink/downlink mobile channel, processes for the multichannel uplink/downlink input signal received from corresponding uplink/downlink channel based on described control command, to provide corresponding uplink/downlink complex baseband signal.
Particularly, described input interface 11 comprises: up input interface 111, descending input interface 112 and uplink/downlink input handover module 113.
Described up input interface 111 and descending input interface 112 correspondence receive the input signal of multichannel up link and down link and convert corresponding uplink/downlink complex baseband signal to and exported.
Concrete, described up input interface 111 and descending input interface 112 share or each self-contained down-converted module, after receiving the input signal of multichannel uplink/downlink of uplink/downlink channel, received input signal is carried out down-converted, to obtain corresponding uplink/downlink complex baseband signal and to be exported.
Described uplink/downlink input handover module 113 transports to described multi-antenna wireless environmental simulation unit 13 for switching according to the control command of described main control unit 12 complex baseband signal selecting the up input interface 111 in described input interface 11 or descending input interface 112 to export.
Such as, described control command is upload control instruction, then described uplink/downlink input handover module 113 will connect described up input interface 111, and the up complex baseband signal that described up input interface 111 is obtained transports 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, independently multipath fading coefficient is generated based on described fade condition parameter, and based on described multipath fading coefficient, the uplink/downlink complex baseband signal that described input interface 11 provides is carried out to the decline simulation of channel circumstance, obtain the uplink/downlink complex baseband signal after declining.So, the two-way environment simulation of TDD system 1 is realized.
Particularly, described multi-antenna wireless environmental simulation unit 13 selects the model of pre-established space channel environment according to described control command, and generate the multipath Time-varying fading coefficient of each channel in real time, corresponding correlation matrix is obtained again and described multipath Time-varying fading coefficient carries out matrix operation to obtain the multipath Time-varying fading coefficient of final simulating multi-path fading environment from described main control unit 12 pretreated fade condition parameter list, so can construct the time varying channel matrix characterizing Real-time Channel environment in real time, the complex baseband signal provided by described input interface 11 again and this channel matrix carry out real-time operation, to obtain the complex baseband signal after declining.
Wherein, the input and output quantity (antenna amount of the transmitting/receiving in corresponding multiaerial system 1) of spatial Channel Model can be identical, also can be different.Such as, in practical communication system 1, the antenna amount of base station is M, the antenna amount of travelling carriage is N, the quantity that then can configure the up complex baseband signal of input is N (number of transmission antennas of travelling carriage), the quantity of the descending complex baseband signal of 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 M (the reception antenna quantity of base station), the output of descending complex baseband signal is 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 coefficient generation module 131, multipath power distribute 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 coefficient generation module 131 under the control of described main control unit 12, lower than input signal sample rate (F
s) sample rate
the mode of lower employing time-division produces the Time-varying fading coefficient in the normalized each footpath for analog channel environment successively, and wherein, the Time-varying fading coefficient in each footpath is mutually independent.
Particularly, described independent fading coefficient generation module 131 is at low sampling rate
lower utilize described fade condition parameter list to provide equally distributed random parameter, emulation moment channel model input signal quantity M(uplink/downlink complex baseband signal quantity) and output signal quantity N(descending/up complex baseband signal quantity), utilize the random fading model (as Jakes model common in document and multiple improved model thereof) based on sine-wave superimposed method to generate each footpath independently normalization Time-varying fading coefficient of M*N sub-channels successively.Suppose that the multipath tap number of every sub-channels is L, then the fading coefficients in final each moment generated can form the matrix H of M × N × L
ω, wherein corresponding multipath tap l (l=0,1 ..., L-1) M × N fading matrix H
ωl the sample rate of () is
wherein, sine wave can adopt the mode of direct digital frequency synthesier (DDS) to generate in the mode of look-up table, to improve formation speed.When hardware resource allows, the described Time-varying fading coefficient in each footpath also can adopt formed filter method or IFFT method to realize.
Described multipath power distribution and inter-channel correlation module 132 are for by sample rate being
the Time-varying fading coefficient in normalized each footpath and described fade condition parameter in multidiameter delay power spectrum and correlation matrix carries out power division and correlation loads, and export the sample rate lower than described input signal
the multipath Time-varying fading coefficient of each subchannel.
Particularly, as shown in Figure 3.Described multipath power distribution 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
ωl () is above-mentioned matrix H
ωthe matrix of the 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, then
obtain the channel matrix H (l) comprising multiple antennas spatial information corresponding to multipath tap l further by matrix operation after power division,
wherein R
txfor the input correlation matrix of Space-time channel model, R
rxfor exporting correlation matrix.This process is matrix operation, and the sample rate of the channel matrix H (l) in each footpath of correspondence of output is still
described multipath fading coefficient interpolator group 133 is for being increased to the sample rate of the complex baseband signal of input by the sample rate of described multipath Time-varying fading coefficient.
Particularly, for realizing the convolution of baseband signal and fading coefficients, need by the fading coefficients of fading matrix H (l) corresponding for each footpath by low sampling rate
inside be inserted to the sample rate F of baseband signal
son.Therefore, comprise the interpolater of multichannel high interpolation ratio in described multipath fading coefficient interpolator group 133, for completing the conversion of low sampling rate multipath Time-varying fading coefficient to input baseband signal samples rate.The Time-varying fading coefficient of the low sampling rate in every bar footpath of every sub-channels is all accomplished to the conversion of signal sampling rate by interpolater.Described interpolater is preferably linear interpolation.
Described channel model group 134 is for forming channel model matrix according to the signal input quantity and output quantity for the treatment of simulated environment, the described uplink/downlink complex baseband signal of input and the multipath Time-varying fading coefficient that exports of described multipath fading coefficient interpolator group 133 are carried out convolution algorithm to obtain multiple subchannel and decline and export, then optionally sub-channel merges, with the complex baseband signal after being declined accordingly.
Concrete, described channel model group 134 is by the described uplink/downlink complex baseband signal of input and the multipath Time-varying fading coefficient that exports of described multipath fading coefficient interpolator group 133 carries 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, in each subchannel filter simulation multiple antennas environment, dual-mode antenna between channel circumstance, preferably, each described subchannel filter carries out cascade based on described fade condition parameter, with the channel circumstance providing multipath number to be greater than preset value.
Multiple subchannel filter forms 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.Such as, the input quantity of present 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 road complex base band that N number of subchannel filter of every a line is corresponding identical inputs, the complex base band input of the capable subchannel filter of such M corresponding M road, after the decline of the M sub-channels filter often arranged exports linear merging, the fading signal that a corresponding road exports, like this, the N number of complex baseband signal exported after the decline of N row subchannel filter correspondence.
Preferably, each channel model forming channel model matrix in described channel model group 134 adopts the tapped delay line structure of FIR filter to realize, each subchannel filter independently controls by described main control unit 12, to realize the control to particular sub-channel.
Such as, utilize particular sub-channel in the described channel model group 134 in described fade condition parameter list invalid, realize between each input signal separate.Multiple inputoutput pair can be configured to organizes independently channel more, also can be configured to the channel with correlation under the control of described main control unit 12.As a kind of prioritization scheme of described channel model group 134, wherein, the tapped delay line structure of each subchannel filter can be replaced Farrow structure, to realize mark time delay, improves the multi-path resolved power of wireless environment simulation further.
More preferably, in order to simulate multichannel environment more accurately, each channel model in described channel model group 134 also comprises multiple RAM of cascade.
Described RAM is for providing the time delay in analog channel environment.
Particularly, for the simulation of broadband wireless signal environment, general multidiameter delay resolving power is higher, and the simulation for the multipath compared with long delay needs a large amount of register resources to complete the time delay of input signal, and the memory effect of analog wireless channel, resource overhead is large.Adopt Large Copacity RAM to realize the time delay of input signal in the present embodiment, when higher time delay resolving power, the simulation of long delay multipath component can be realized.
Described noise synthesis module 136 is for the white noise in artificial antenna environment, and the complex baseband signal after decline that described white noise is added to.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.
Be added to after the white Gaussian noise of noise parameter to described unit power that described noise mixer is used for providing according to described fade condition parameter list is weighted the uplink/downlink complex baseband signal after declining.
Described output interface 14 accesses uplink/downlink channel, exports in corresponding uplink/downlink channel after being processed by described uplink/downlink complex baseband signal based on described control command.
Particularly, described output interface 14 comprises: up output interface 142, descending output interface 141 and uplink/downlink output switching module 143.
Uplink/downlink complex baseband signal after decline is converted to the intermediate frequency of corresponding multichannel Uplink/Downlink by described up output interface 142 and descending output interface 141 or radiofrequency signal exports 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 uplink/downlink complex baseband signal after receiving decline, received complex baseband signal is carried out upconversion process, to obtain the intermediate frequency of corresponding multichannel Uplink/Downlink or radiofrequency signal and to be exported.
Described uplink/downlink output switching module 143 selects described up output interface 142 or descending output interface 141 for switching according to the control command of described main control unit 12, to carry out upconversion process and transmitting to the complex baseband signal after decline.
Such as, described control command is upload control instruction, then described uplink/downlink output switching module 143 will connect described descending output interface 141, the complex baseband signal that multi-antenna wireless environmental simulation unit 13 described in described descending output interface 141 is exported carries out upconversion process and is 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 inerface configuration Uplink/Downlink subframe time that tester provides according to main control unit 12, and be configured for the model parameter of simulation uplink/downlink space channel environment respectively, described main control unit 12 generates the multidiameter delay power weightings coefficient being used for multipath fading process according to described parameter, the fade condition parameters such as the correlation matrix of spatial coherence process, and described fade condition parameter is encapsulated in fade condition parameter list, and the frame synchronizing signal of base station is obtained according to Uplink/Downlink subframe time, fade condition parameter list and the control command of corresponding upstream or downstream link is exported when obtaining described frame synchronizing signal, 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 be supplied to described multi-antenna wireless environmental simulation unit 13, described multi-antenna wireless environmental simulation unit 13 is after receiving fade condition parameter list and control command, time-multiplexed mode is adopted to produce normalization for analog channel environment successively by independent fading coefficient generation module 131 according to the parameter provided in fade condition parameter list and the Time-varying fading coefficient in independently each footpath, described multipath power distributes and inter-channel correlation module 132 carries out power division and correlation loading according to the Time-varying fading coefficient in each footpath according to described fade condition parameter list, to obtain the multipath Time-varying fading coefficient of each channel with spatial coherence, by multipath fading coefficient interpolator group 133, the sample rate of described multipath Time-varying fading coefficient is increased to the sample rate of the complex baseband signal of input again, channel model matrix is formed according to treating that the signal of simulated environment inputs quantity and exports quantity by channel model group 134, the described uplink/downlink complex baseband signal of input and the multipath Time-varying fading coefficient that exports of described multipath fading coefficient interpolator group 133 are carried out convolution algorithm to obtain multiple subchannel and decline and export, then optionally sub-channel merges, with the complex baseband signal after being declined accordingly, output interface 14 is transported to after reloading noise, according to control command by output interface 14 complex baseband signal after simulation decline is carried out upward frequency conversion and is sent in respective channel again.
In sum, bidirectional mobile communication environmental simulation system of the present invention, corresponding fade condition parameter list is generated according to input simulated environmental parameters by main control unit, and obtain the frame synchronizing signal of base station to generate the control command of control inputs interface, multi-antenna wireless environmental simulation unit and output interface when the upstream or downstream time slot provided with uplink/downlink sub-frame configuration parameter, the multipath fading process of the channel under multi-channel wireless ring can be simulated really by the mode changing model parameter flexibly; In addition, this independent fading coefficient generation module generates the multipath Time-varying fading coefficient of low sampling rate, again multipath Time-varying fading coefficient is obtained sample rate by interpolation process identical with the sample rate of received uplink/downlink complex baseband signal, by choose reasonable low sampling rate value and sample rates values, can without the need to multiplier, resource overhead is little; In addition, the present invention is due to can the radio wave propagation characteristic of Reality simulation multiple antennas mobile environment, be particularly useful for the uplink/downlink two-way environment simulation of TDD system, for the system in new generation broadband mobile communication technology and system debug, measurement provide actual multiple antennas to move the simulation of propagating scene, for the design of system of broadband wireless communication, checking and optimization provide foundation.So the present invention effectively overcomes 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 without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, 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 based on the obtained fade condition parameter determining corresponding uplink/downlink channel circumstance for the model parameter simulating uplink/downlink space channel environment, and generate the control command for switching the simulation of uplink/downlink channel circumstance based on obtained uplink/downlink sub-frame configuration parameter and from the frame frame synchronizing signal 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, processes for the multichannel uplink/downlink input signal received from corresponding uplink/downlink channel based on described control command, to provide corresponding uplink/downlink complex baseband signal;
Multi-antenna wireless environmental simulation unit, for under the control of described control command, independently multipath fading coefficient is generated based on described fade condition parameter, and based on described multipath fading coefficient, the uplink/downlink complex baseband signal that described input interface provides is carried out to the decline simulation of channel circumstance, obtain the uplink/downlink complex baseband signal after declining; Wherein, first generate the multipath Time-varying fading coefficient of low sampling rate, again multipath Time-varying fading coefficient is obtained sample rate by interpolation process identical with the acquisition rate of received uplink/downlink complex baseband signal, carry out the many fading process of analog channel by choose reasonable low sampling rate value and sample rates values and generate described multipath fading coefficient;
The output interface of access uplink/downlink channel, for exporting to uplink/downlink baseband signal described in multichannel after processing in corresponding uplink/downlink channel based on described control command.
2. bidirectional mobile communication environmental simulation system according to claim 1, it is characterized in that, described main control unit also for generating 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 coefficient generation module, for under the control of described main control unit, under the sample rate lower than described input signal, adopt time-multiplexed mode to produce the Time-varying fading coefficient in the normalized each footpath for analog channel environment successively, wherein, the Time-varying fading coefficient in each footpath is 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 distributes and inter-channel correlation module, for by the multidiameter delay power spectrum in the Time-varying fading coefficient in normalized each footpath and described fade condition parameter and correlation matrix carries out power division and correlation loads, and export the multipath Time-varying fading coefficient 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, for the sample rate of described multipath Time-varying fading coefficient being 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 the signal input quantity and output quantity for the treatment of simulated environment, the described uplink/downlink complex baseband signal of input and the multipath Time-varying fading coefficient that exports of described multipath fading coefficient interpolator group are carried out convolution algorithm to obtain multiple subchannel and decline and export, then optionally sub-channel merges, with the complex baseband signal after being declined accordingly.
7. bidirectional mobile communication environmental simulation system according to claim 6, it is characterized in that, described channel model group comprises multiple subchannel filter, in each subchannel filter simulation multiple antennas environment, dual-mode antenna between multi-path channel environment, each described subchannel filter carries out cascade based on described fade condition parameter, with the channel circumstance providing multipath number to be greater than preset value.
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| WO2006026799A2 (en) * | 2004-09-06 | 2006-03-16 | Arc Seibersdorf Research Gmbh | Method for simulating a mimo channel |
| CN1933378A (en) * | 2006-09-30 | 2007-03-21 | 华为技术有限公司 | Radio channel simulating method and apparatus thereof |
| CN102158267A (en) * | 2010-01-04 | 2011-08-17 | 美国博通公司 | Method and system for processing signals |
| CN102868459A (en) * | 2011-05-11 | 2013-01-09 | 普斯米工程公司 | Mobile terminal simulator for a wireless telecommunications network and method to simulate a mobile terminal |
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| WO2006026799A2 (en) * | 2004-09-06 | 2006-03-16 | Arc Seibersdorf Research Gmbh | Method for simulating a mimo channel |
| CN1933378A (en) * | 2006-09-30 | 2007-03-21 | 华为技术有限公司 | Radio channel simulating method and apparatus thereof |
| CN102158267A (en) * | 2010-01-04 | 2011-08-17 | 美国博通公司 | Method and system for processing signals |
| CN102868459A (en) * | 2011-05-11 | 2013-01-09 | 普斯米工程公司 | Mobile terminal simulator for a wireless telecommunications network and method to simulate a mobile terminal |
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