CN100370766C - Design method for distributed wireless communication transmission technique test platform - Google Patents
Design method for distributed wireless communication transmission technique test platform Download PDFInfo
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- CN100370766C CN100370766C CNB2005101245986A CN200510124598A CN100370766C CN 100370766 C CN100370766 C CN 100370766C CN B2005101245986 A CNB2005101245986 A CN B2005101245986A CN 200510124598 A CN200510124598 A CN 200510124598A CN 100370766 C CN100370766 C CN 100370766C
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Abstract
The present invention relates to a design method for a test platform of distributed wireless communication transmission technology, which can evaluate general wireless communication transmission technology and the important transmission technologies of multiple-input multiple-output communication systems in future wireless communication. Sockets are used for connecting processors of a test platform through the TCP/IP network protocol, and operations of an entire test are dispersed to two computers. On one hand, simulation tests are improved in the two aspects of simulation scale and execution speed; on the other hand, the physical separation of a transmitter from a receiver is really realized, and data received by the receiver is completely decided by a third party evaluation unit; as a result, the situation that a test party causes the short circuit of the transmitter and the receiver is completely stopped. Therefore, the present invention can increase the efficiency of the test and the evaluation of the wireless communication transmission technology, and the test fairness is ensured.
Description
Technical field
The present invention relates to a kind of method for designing that is used for wireless communication transmission technique test platform, relate in particular to a kind of method for designing of the distributed wireless communication transmission technique test platform based on Ethernet.
Background technology
Over the last couple of decades, the development of wireless communication systems that with the mobile communication is representative is maked rapid progress, with the low speed speech business is first of representative, two third-generation mobile communication systems have not more and more satisfied the needs of people to data and multimedia service, with high-speed data, multimedia, intelligent business is that the 3-G (Generation Three mobile communication system) of main target is more and more near people's life, 3-G (Generation Three mobile communication system) is an important development stage to following personal communication evolution, have epoch-making significance, it will be to the mankind's life, expanding economy produces great influence.Along with 3-G (Generation Three mobile communication system) progresses into commercialization, a hundred flowers blossom in the relevant super 3G (Third Generation) Moblie (Beyond 3G) and the research of the 4th third-generation mobile communication both at home and abroad simultaneously.
Begin so far from the research and development of second generation mobile communication system, Computer Simulation test has become the powerful mean of mobile communication research and development.Before each new technology or each new system put it into commercial operation all is to have carried out long emulation to check its performance by many companies or research institution.For the such beforehand research technology evaluation of the 4th generation wireless communication system, to adopt method of computer simulation to obtain just entering the actual measurement stage after the objectivity checking especially earlier.The emulation testing of common communication system can be divided into link level simulation test and system-level emulation testing two aspects.System-level emulation testing mainly is to carry out emulation testing at wireless access system.Link level simulation test mainly be to the communication system physical layer Radio Transmission Technology (as encode, interweave, modulation and spread spectrum etc.) carry out emulation, obtain the performance of this technology under the different radio channel.Simulation result mainly shows as the relation curve of the error rate (BER) under the different radio environment or frame error rate (FER) and signal to noise ratio.Link level simulation mainly contains two purposes, and the one, be used to check the performance of Radio Transmission Technology, the 2nd, the end to end performance of check wireless system, and provide the data support for system-level emulation.
Multiple-input and multiple-output (MIMO, Multiple-Input Multiple-Output) wireless communication transmission technique has well anti-fading and antimierophonic ability, thereby can obtain huge capacity.Therefore, in the limited wireless channel of power bandwidth, multiple-input and multiple-output (MIMO, Multiple-Input Multiple-Output) wireless communication transmission technique is one of important technology of realizing high data rate, raising power system capacity and transmission quality.Its advantageous characteristic makes it to become one of key technology in following super three generations's communication system (B3G) and the 4th generation communication system.
But the Radio Transmission Technology of multiple-input-multiple-output communication system is assessed required operand and is tested much bigger than single assessment of importing single output communications system in the past.If consider the test under multi-user's situation again, its operand can't utilize existing separate unit high-performance computer to realize.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of efficient that can improve the wireless communication transmission technique testing evaluation be provided, guarantee the method for designing of the distributed wireless communication transmission technique test platform of test fairness,
For achieving the above object, the technical solution used in the present invention is:
1) generation of source bits stream
At first utilize iteration to get the random signal train that a binary sequence that middle method, displacement method, multiplicative congruential method or mixed congruence method will import at random produces its conversion a compound multiple Gaussian Profile, and then be created on (0,1) interval by the hypothesis test of random signal and obey equally distributed and can be at the random sources bit stream of freely regulated speed, frame length between the 8Kbps to 100Mbps;
2) link tested transmitter module
Tested transmitter module chain is tapped into the emission main frame of test platform according to interface specification, then the source bits stream that generates is inserted tested transmitter module, tested transmitter module to the data that receive carry out chnnel coding, interweave, the data of modulation, Space Time Coding and the output of framing algorithm;
3) generation of multiple-input and multiple-output mimo channel module
Suppose that the multiple-input and multiple-output mimo channel has M transmit antennas and N reception antenna, that is M input and N export, mimo channel just is equivalent to the independently single single output of input SISO channel of M * N bar so, each is independently singly imported single output SISO channel and has frequency selective fading and time selective fading two specific characters, the realization of frequency selective fading characteristic is that " broadband " signal is become " arrowband " signal by multipath channel, thereby obtain required frequency selective fading by a plurality of independently single footpaths channel weights then, the realization of time selective fading characteristic is a method of utilizing forming filter, generation meets Doppler's power spectrum shape, the whose amplitude obeys rayleigh distributed, phase place is obeyed equally distributed random process sampled signal and is gone to multiply by the result that the output signal of tested transmitter obtains, thereby obtain required time selective fading, promptly generate the M * single output of N bar list input SISO channel, and then obtained the multiple-input and multiple-output mimo channel;
4) checking of multiple-input and multiple-output mimo channel module independence
The footpath number of supposing the multipath channel between any in the M * single output of N bar list input SISO channel is K, M * N * K independently single footpath channel carried out stochastical sampling get wherein any two groups of two groups of stochastic variables that constitute correspondence, check the independence of two interchannels with correlation function or cross covariance function, if the value of two correlation functions is that zero two channels are separate, otherwise the generation that changes multiple-input and multiple-output mimo channel module over to regenerates multiple-input and multiple-output mimo channel module;
5) Network Transmission of data
Behind mimo channel, utilize socket to realize the ICP/IP protocol Network Transmission data of emission main frame output, be about to these data and be sent to the reception main frame, read this data by the tested receiver module that receives in the main frame;
6) link tested receiver module
The tested receiver Module Links is advanced the reception main frame of test platform according to interface specification, utilize Network Transmission that the dateout of multiple-input and multiple-output mimo channel module is inserted the tested receiver module then, the tested receiver module carries out the data that receive can testing after channel estimating, equilibrium, demodulation, the channel decoding algorithm output bit flow;
7) utilize the virtual instrument display result
According to period map method, Maximum Entropy Spectral Estimation method or Pisarenko harmonic wave decomposition method are carried out power spectrum estimation to the dateout of tested transmitter module and the bit stream and the source bits stream of tested receiver module output are contrasted, add up total error bit number, and then obtain the error rate, utilize the various demonstration class functions that provide in the visual c++ to show at last.
The present invention can assess the transmission technology of multiple-input-multiple-output communication system very important in common wireless communication transmission technique and the following radio communication, utilize socket to utilize the TCP/IP procotol to couple together each processor of test platform, the computing of whole test is distributed on two computers, makes emulation testing all be improved aspect simulation scale and the execution speed two on the one hand; On the other hand, make tested transmitter module and tested receiver module realize that really physical separation and the received data of tested receiver module are decided by our the third party unit of assessment fully, have stopped the situation of test side with tested transmitter module and tested receiver module short circuit fully; Therefore, the present invention can improve the efficient of wireless communication transmission technique testing evaluation, has guaranteed the fairness of test.
Description of drawings
Fig. 1 is that module of the present invention is formed schematic diagram;
Fig. 2 is the basic setup schematic diagram of data exchange interface of the present invention;
Fig. 3 is a control flow schematic diagram of the present invention;
Fig. 4 is the SISO channel implementation method schematic diagram among the present invention
Fig. 5 is the interface schematic diagram that the present invention launches main frame;
Fig. 6 is the interface schematic diagram that the present invention receives main frame.
Embodiment
Below in conjunction with accompanying drawing to the present invention with further describing.
Referring to Fig. 1, test platform of the present invention is promptly launched main frame and is received main frame and formed by two processors that connect by network.Wherein launch main frame and realize the function of information source, transmitter module, channel and uniformity detection module, and receive the function that main frame is realized receiver module and statistical module.In addition, two main frames all are equipped with virtual instrument, in order to observe various statistical indicators.Such as: the virtual instrument that receives main frame can be observed ber curve, planisphere.The virtual instrument of emission main frame can be observed the availability of frequency spectrum, planisphere and the power histogram of tested module.And the uniformity detection module is for to the unified in addition module of the duplex mode of TDD (time division duplex) and two kinds of different systems of FDD (Frequency Division Duplexing (FDD)).Be convenient to like this duplex mode of two kinds of different systems is carried out fair assessment.Platform of the present invention self should have information source generation module, mimo channel module, the responsible network transmission module and the virtual instrument module that links two main frames of variable bit rate.Utilize Microsoft Visual C++ to write these modules:
The source bits stream of variable bit rate is actually a kind of random signal, the random signal that the present invention need produce be 0 and 1 two on evenly distribute, just get 0 or get 1 probability and be 0.5.Theoretically, as long as a kind of random signal of continuous distribution has been arranged, the random signal that just can be distributed arbitrarily by corresponding converter technique, therefore in emulation mode of the present invention, at first be created in (0,1) obeys equally distributed random signal on the interval, utilize converter technique to produce multiple gaussian signal then, because the restriction of machine word length, the present invention can not obtain real random signal, but, as long as can just can be used as real random signal to it and use by all kinds of statistical tests of random signal.Evenly distribute in the mathematical method of random signal producing (0,1), have iteration to get middle method, displacement method, multiplicative congruential method and mixed congruence method.The present invention adopts statistical property better, uses wider mixed congruence method;
Tested transmitter module chain is tapped into the emission main frame of test platform according to interface specification, then the source bits stream that generates is inserted tested transmitter module, tested transmitter module is to the data that receive carry out that channel encode, interweaved, modulation, Space Time Coding and framing algorithm are exported data;
For non-physics mimo channel model emulation, the channel fading coefficient in each footpath of the N in the mimo channel * M subchannel equals the channel fading coefficient of separate N * M bar SISO (the single output of single input) channel.Therefore, the emulation of multiple-input and multiple-output mimo channel can be divided into two parts and carries out: 1) generate independently multidiameter fading channel.How to generate independently that multidiameter fading channel is the prerequisite of multiple-input and multiple-output mimo channel emulation, the channel fading coefficient that the channel fading coefficient in each footpath of the N in the multiple-input and multiple-output mimo channel * M subchannel equals separate N * M bar SISO (the single output of single input) channel and each product of corresponding spatial correlation matrix directly.Have only the statistics of generating to go up after the separate fading channel, at this time resulting multiple-input and multiple-output mimo channel coefficient just really has the spatial coherence under predetermined angular power spectral density and the angle spread.Independent multidiameter fading channel can be subjected to the influence of time selective fading and frequency selective fading simultaneously.Therefore should the stimulation frequency selectivity decline for independent multidiameter fading channel, also want the decline of simulation time selectivity.In fact " broadband " signal can be regarded as by multipath channel is that " arrowband " signal is realized by a plurality of independently single footpaths channels respectively to frequency selective fading.And time selective fading is to utilize the method for forming filter, generation meets Doppler's power spectrum shape, whose amplitude obeys rayleigh distributed, phase place are obeyed the result that equally distributed random process sampling goes multiply by the input random signal, are required time selective fading; 2) the independent multidiameter fading channel that generates is carried out the independence checking.Suppose that it is K that N * M bar list is imported the footpath number of arbitrary channel in single delivery channel, like this, the multiple-input and multiple-output mimo channel can be regarded as by M * N * K independently single footpath channel and form.The multidiameter fading channel parameter can be produced by white-noise excitation.For different propagation paths, select different noise seeds for use with good cross correlation, can guarantee uncorrelated between fading channel.Want uncorrelated between the authenticated channel, M * N * K independently single footpath channel carried out stochastical sampling get wherein any two groups of two groups of stochastic variables that constitute correspondence, check the independence of two interchannels with correlation function or cross covariance function, if the value of two correlation functions is that zero two channels are separate, otherwise regenerates multiple-input and multiple-output mimo channel module; Utilize the method for hypothesis testing, we have searched out 400 seeds that guarantee independence from more than 40 hundred million seeds, and wherein 8 * 8 * 6=384 seed is used to generate these 64 independently 6 channels directly.
Network Transmission: the present invention uses socket to realize mixed-media network modules mixed-media, employing be that model of client realizes interconnected between each main frame, model of client is the most frequently used example of distributed application program;
The tested receiver Module Links is advanced the receiving platform of test platform according to interface specification, utilize Network Transmission that the dateout of multiple-input and multiple-output mimo channel module is inserted the tested receiver module then, the tested receiver module carries out the data that receive can testing after channel estimating, equilibrium, demodulation, the channel decoding algorithm output bit flow;
According to period map method, Maximum Entropy Spectral Estimation method or Pisarenko harmonic wave decomposition method are carried out power spectrum estimation to the dateout of tested transmitter module and the bit stream and the source bits stream of the output of tested receiver module are compared, obtain the error rate, utilize the various demonstration class functions that provide among the Visual C++ to show at last.
Referring to Fig. 2, the primary control program of test platform of the present invention provides 5 common data exchange areas, uses A respectively, and B, C, D, E represent, are used for the data passes between previous stage module and the back one-level module, or are used for the data that virtual instrument shows its output.That is to say that buffering area is the dateout of previous stage module and the input data of back one-level module.Each data exchange zone all is continuous memory spaces of system assignment.Wherein A, B, three data exchange areas of C are opened up by the emission main frame, via two machine communication the data of C exchange area are sent to the input of the D exchange area that receives main frame as receiver module, that is the data in two exchange areas of C and D identical (the emulation granularity of two exchange areas of B and C is identical).
Referring to Fig. 3, whole test platform of the present invention mainly comprises two class flow processs: the first kind is the two machine communication flow process, and second class is the virtual instrument control flow.In first flow process, after the data of channel output deposit buffering area in, to read and write flag bit (global variable) is changed to readable, and this incident informed user-interface thread as a message, user-interface thread is judged after this message attributes, call network communication module and carry out transmit operation, the network communication module that receives host subscriber interface thread receives after the data, to read and write flag bit (global variable) and be changed to readablely, can and operate accordingly from this buffering area reading of data in order to inform worker thread.The second class workflow then is to utilize the method realization virtual instrument of critical zone and the thread synchronization between the worker thread.At first, the source bits flow data that information source produces puts it among the buffering area A.Then, the tested transmitter module that is provided by tested side takes out the source bits flow data from buffering area A, after handling, put into the B buffering area.The mimo channel module is put into the C buffering area after the data among the buffering area B are handled, and calls Network Transmission again the data in the C buffering area are sent to the computer that receives main frame one side by local area network (LAN).The computer that receives main frame side deposits the data that receive among the buffering area D in, and the tested receiver module is taken out data from buffering area D, and after these data are handled, the bit stream of its output is sent among the buffering area E.Virtual instrument reading of data and source bits stream from buffering area E is compared, with error performance, the spectrum utilization situation that obtains tested side.Finish after the above operation, receive main frame and send out control information, show that current data disposes, can continue to send data to the emission main frame.In above flow process, because the user needs waveform, the power histogram situation of real-time each buffer data of observation, so we make shared these 5 buffering areas of user-interface thread and worker thread, that is A, B, C, D, E.Utilize the method for thread communication between these two threads, can alternately control each buffering area.
Referring to Fig. 4, the realization of SISO selectivity of channel frequency fading characteristic is with pending data block, that is the data of tested transmitter module output.Independent decline through each path, with the result in the receiving terminal data exchange zone, that is the RX position among Fig. 2 is weighted, and being about to that " broadband " signal can regard as by multipath channel is that " arrowband " signal is realized (suppose a SISO channel directly be made up of K) by a plurality of independent K Rayleigh flat fading module respectively.The realization of the time selective fading of SISO channel is then corresponding to the Rayeigh flat fading module among Fig. 4, this module utilizes the method for forming filter to produce the power spectral density that meets the Jakes model, whose amplitude obeys rayleigh distributed, phase place are obeyed equally distributed random process.
Referring to Fig. 5, two darker regions of upside show among the figure is that tested side's Radio Transmission Technology scheme is with test platform measured spectrum utilization situation under the particular channel condition.
Referring to Fig. 6, two darker regions of upside show among the figure is that tested side's Radio Transmission Technology scheme adopts the measured bit error rate performance of test platform under the particular channel condition.
Claims (1)
1. the method for designing of distributed wireless communication transmission technique test platform is characterized in that:
1) generation of source bits stream
At first utilize iteration to get the random signal train that a binary sequence that middle method, displacement method, multiplicative congruential method or mixed congruence method will import at random produces its conversion a compound multiple Gaussian Profile, and then be created on (0,1) interval by the hypothesis test of random signal and obey equally distributed and can be at the random sources bit stream of freely regulated speed, frame length between the 8Kbps to 100Mbps;
2) link tested transmitter module
Tested transmitter module chain is tapped into the emission main frame of test platform according to interface specification, then the source bits stream that generates is inserted tested transmitter module, tested transmitter module to the data that receive carry out chnnel coding, interweave, the data of modulation, Space Time Coding and the output of framing algorithm;
3) generation of multiple-input and multiple-output mimo channel module
Suppose that the multiple-input and multiple-output mimo channel has M transmit antennas and N reception antenna, that is M input and N export, mimo channel just is equivalent to the independently single single output of input SISO channel of M * N bar so, each is independently singly imported single output SISO channel and has frequency selective fading and time selective fading two specific characters, the realization of frequency selective fading characteristic is that " broadband " signal is become " arrowband " signal by multipath channel, thereby obtain required frequency selective fading by a plurality of independently single footpaths channel weights then, the realization of time selective fading characteristic is a method of utilizing forming filter, generation meets Doppler's power spectrum shape, the whose amplitude obeys rayleigh distributed, phase place is obeyed equally distributed random process sampled signal and is gone to multiply by the result that the output signal of tested transmitter obtains, thereby obtain required time selective fading, promptly generate the M * single output of N bar list input SISO channel, and then obtained the multiple-input and multiple-output mimo channel;
4) checking of multiple-input and multiple-output mimo channel module independence
The footpath number of supposing the multipath channel between any in the M * single output of N bar list input SISO channel is K, M * N * K independently single footpath channel carried out stochastical sampling get wherein any two groups of two groups of stochastic variables that constitute correspondence, check the independence of two interchannels with correlation function or cross covariance function, if the value of two correlation functions is that zero two channels are separate, otherwise the generation that changes multiple-input and multiple-output mimo channel module over to regenerates multiple-input and multiple-output mimo channel module;
5) Network Transmission of data
Tested transmitter module behind mimo channel, utilizes socket to realize the ICP/IP protocol Network Transmission data of output, is about to these data and is sent to the reception main frame, reads this data by the tested receiver module that receives in the main frame;
6) link tested receiver module
The tested receiver Module Links is advanced the reception main frame of test platform according to interface specification, utilize Network Transmission that the dateout of multiple-input and multiple-output mimo channel module is inserted the tested receiver module then, the tested receiver module carries out the data that receive can testing after channel estimating, equilibrium, demodulation, the channel decoding algorithm output bit flow;
7) utilize the virtual instrument display result
According to period map method, Maximum Entropy Spectral Estimation method or Pisarenko harmonic wave decomposition method are carried out power spectrum estimation to the dateout of tested transmitter module and the bit stream and the source bits stream of tested receiver module output are contrasted, add up total error bit number, and then obtain the error rate, utilize the various demonstration class functions that provide in the visual c++ to show at last.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100458713C (en) * | 2006-07-12 | 2009-02-04 | 上海华虹集成电路有限责任公司 | Non-contact intelligent card emulation system |
| CN100465905C (en) * | 2006-07-25 | 2009-03-04 | 上海华虹集成电路有限责任公司 | Non-contacting intelligent card emluator |
| GB0705328D0 (en) * | 2007-03-20 | 2007-04-25 | Skype Ltd | Method of transmitting data in a communication system |
| CN101299223B (en) * | 2008-06-19 | 2010-06-16 | 中兴通讯股份有限公司 | Emulation method and device of high speed serial duct receiver balance |
| CN101567765B (en) * | 2009-06-04 | 2012-07-25 | 浙江大学 | Distribution type space-time pre-coding transmission method based on channel angle domain information |
| CN103067099A (en) * | 2012-12-18 | 2013-04-24 | 上海电机学院 | Information channel simulation method and device based on virtual instrument technology |
| CN107481723A (en) * | 2017-08-28 | 2017-12-15 | 清华大学 | A kind of channel matched method and its device for Application on Voiceprint Recognition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1119061A (en) * | 1993-12-07 | 1996-03-20 | 艾利森电话股份有限公司 | A method and apparatus for testing a base station in a time division multiple access radio communications system |
| CN1185263A (en) * | 1995-04-03 | 1998-06-17 | 艾利森电话股份有限公司 | Transceiver tester for cellular radio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1119061A (en) * | 1993-12-07 | 1996-03-20 | 艾利森电话股份有限公司 | A method and apparatus for testing a base station in a time division multiple access radio communications system |
| CN1185263A (en) * | 1995-04-03 | 1998-06-17 | 艾利森电话股份有限公司 | Transceiver tester for cellular radio |
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