CN101378278B - Channel measurement for wireless multi-input multi-output communication system - Google Patents
Channel measurement for wireless multi-input multi-output communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention provides a wireless MIMO communication system which comprises a transmitter antenna array and a receiver antenna array, a channel is formed from one antenna of the transmitter antenna array to one antenna of the receiver antenna array. The MIMO system also comprises a channel measuring system which comprises a transmitter subsystem, a receiver subsystem and a synchronous subsystem. The transmitter subsystem is used for generating test frames which are transmitted synchronously by the transmitter antenna array and the transmitter trigger signal. The receiver subsystem receives the test frames from the transmitter antenna array synchronously by the receiver antenna array and the receiver trigger signal, and estimates each channel by computing channel shock response of each received test frame. The channel shock response is corresponding to the timing of the transmitter trigger signal and the receiver trigger signal. The synchronous subsystem generates the transmitter trigger signal and the receiver trigger signal which are mutually synchronous.
Description
Technical field
Relate generally to multiple-input, multiple-output of the present invention (MIMO:Multiple-Input Multiple-Output) communication system, relates to the channel measurement of wireless MIMO communication system especially.
Background technology
MIMO communication system is typically included in a plurality of antennas of its transmitter-side and receiver side, to provide diversity (diversity) in decline (fading) environment.This makes communication system that capacity, coverage and the reliability of remarkable increase can be provided.
Designing and optimizing in the process of such mimo system, the true radio channel properties of understanding between transmitter and receiver is extremely important.Typically use channel to intercept (channelsounding) and obtain channel parameter, channel is intercepted the technology of utilizing the known signal waveform through strict difinition to encourage channel and estimating channel response by measuring output waveform that refers to.
Fig. 1 shows the configuration of measuring a kind of prior art of transient state mimo channel response according to channel intercepting method.As can be seen from Fig. 1, transmitter is controlled 103 pairs of transmitter wireless devices of computer (radio) 101 and is controlled to generate pumping signal according to predetermined signaling scheme.Radio frequency (RF) is changed and be up-converted to this pumping signal through digital-to-analogue (D/A), is sent to subsequently transmitter antenna location automatics (robot) 102.Transmitter antenna location automatics 102 is subject to the control that transmitter is controlled computer 103, to be automatically located at the location of a plurality of antennas of transmitter-side, and sends pumping signal by radio channel.
In receiver side, be subject to the receiver antenna location automatics 104 reception pumping signals that receiver is controlled the control of computer 106, and this pumping signal is sent to receiver wireless device 105.The pumping signal that 105 pairs of receiver wireless devices receive is carried out down-conversion and modulus (A/D) conversion from RF to base band frequency, thereby and the digital signal generating is sent to receiver control computer 106.Receiver is controlled estimation, channel capacity and other parameter that 106 pairs of these digital signal analyses of computer obtain channel measurement result, channel impulse response (CIR).
Fig. 2 shows the frame structure of the pumping signal of using in the measuring system shown in Fig. 1.This pumping signal is used as " superframe " and sends.As shown in Figure 2, each " superframe " has a channel and intercepts grouping 201 and several packet 203 subsequently, is inserted with a silence period (silence period) 202 between any two adjacent packets.It is that specialized designs is for transient state channel measurement, also referred to as " intercepting frame " that channel is intercepted grouping 201.In receiver side, receiver is controlled computer 106 (with reference to figure 1) and to being included in each lead code (preamble) part of intercepting in frame 201, is carried out channel estimating, the transient state channel impulse response of intercepting frame 201 to obtain each with channel estimation method.For the remainder (being silence period 202 and packet 203) of superframe, supposed quasistatic situation.That is, suppose that radio channel does not change in the transmitting procedure of packet.
But the problem being associated with above-mentioned measuring system is not synchronize between transmitter and receiver.In addition, for the lead code of channel estimating, only by utilizing synchronized algorithm to obtain, and synchronized algorithm can be introduced synchronous error, and result causes measured channel impulse response to be offset in time.Therefore, said system cannot provide the accurate measurement of Doppler frequency spectrum.
Another problem is that configuration as depicted in figs. 1 and 2 only can provide the transient state channel estimating corresponding with " intercepting frame ".And for packet, supposed quasistatic situation.When fast change of channel, this hypothesis will be introduced measure error.In addition, the configuration of above-mentioned prior art cannot provide other statistical property such as Doppler frequency deviation and PDP (Power Delay Profile, power delay spectrum) and so on.These problems cause cannot be in time reconstruct channel accurately.
Summary of the invention
The invention provides a kind of wireless MIMO communication system, it comprises transmitter antenna array and receiver antenna array, and the passage from an antenna of transmitter antenna array to an antenna of receiver antenna array forms channel.Mimo system also comprises channel measurement system, and this channel measurement system comprises transmitter subsystem, receiver subsystem and synchronization subsystem.Transmitter subsystem is in order to generate test frame, and this test frame is synchronously sent via transmitter antenna array and transmitter triggering signal.Receiver subsystem synchronously receives test frame from transmitter antenna array via receiver antenna array and receiver triggering signal, and estimates each channel by calculating the channel impulse response of each test frame receiving.Described channel impulse response is corresponding with the timing of transmitter triggering signal and receiver triggering signal.Synchronization subsystem generates transmitter triggering signal synchronized with each other and receiver triggering signal.
Accompanying drawing explanation
When reading in conjunction with the accompanying drawings following content, can understand more completely above-mentioned and further feature of the present invention, wherein:
Fig. 1 shows for measuring the configuration of the prior art of transient state mimo channel response;
Fig. 2 shows the frame structure of the pumping signal of using in the measurement configuration shown in Fig. 1;
Fig. 3 shows the channel measurement system of wireless MIMO communication system according to an embodiment of the invention;
Fig. 4 A shows the example of the transmission timing of test signal;
Fig. 4 B shows the example of the reception timing of test signal;
Fig. 5 shows the corresponding transient state channel impulse response of the channel with between a pair of antenna of estimating gained;
Fig. 6 shows the simplified flow chart of the operation that the transmitter-side of the wireless MIMO communication system as shown in Figure 3 according to an embodiment of the invention carries out by the channel measurement system of Fig. 3;
The receiver square tube that Fig. 7 shows the wireless MIMO communication system as shown in Figure 3 according to an embodiment of the invention is crossed the simplified flow chart of the operation that the channel measurement system of Fig. 3 carries out.
Embodiment
Below with reference to accompanying drawing, embodiments of the invention are described.
Fig. 3 shows the block diagram of wireless MIMO communication system 300.As shown in Figure 3, wireless MIMO communication system 300 comprises transmitter-side (module 303-305) and receiver side (module 306-308), wherein, transmitter-side is in order to generate and send signal of communication, and receiver side carrys out receiving communication signal via mimo channel 340.Just as seen in Figure 3, in one embodiment, communication system 300 is 2 * 2 systems.The transmitter antenna array 305 that this means communication system 300 comprises two transmitter antennas, and the receiver antenna array 306 of antenna system 300 comprises two receiver antennas.Alternatively, can be with more than two antennas or be less than two antennas and form each aerial array 305-306.All modules of Fig. 3 not shown system 300.
Just as will be described in more detail, according to one embodiment of present invention, wireless MIMO communication system 300 also comprises channel measurement system 350.Channel measurement system 350 for accurately measure and reconstruct at the transmitter-side of system 300 and the channel between receiver side.Below will be described in more detail this.
Just as seen in Figure 3, channel measurement system 350 comprises transmitter control computer 301, transmitter is controlled computer 301 and is generated two test signal sequences, and each test signal sequence has a plurality of test frames that meet by the known communication test standard of user's appointment of communication system 300.In addition, system 350 also comprises double-channel signal generator 302, and signal generator 302 is controlled computer 301 with transmitter and communicated, and generates separately two the digital baseband waveform signals corresponding with in generated test signal sequence one.Digital baseband waveform signal is sent to digital-to-analogue (D/A) transducer 303 of communication system 300 subsequently, and in D/A converter 303, is converted into Analog Baseband test signal.Transmitter radio frequency (RF) front-end module 304 of communication system 300 receives this Analog Baseband test signal subsequently, upconvert it to intermediate frequency (IF), upconvert to again subsequently radio frequency, with each antenna by transmitter antenna array 305 respectively, send.
For simplicity, signal generator 302, D/A converter 303 and transmitter RF front end 304 are illustrated in Fig. 3 as processing the individual devices of double-channel signal respectively.But channel measurement system can have two signal generators, two D/A converters and two transmitter RF front-end modules, to process respectively test signal.Identical situation is also useful in subsequently by the device in the receiver side of describing.In addition, although figure 3 illustrates 2 * 2 systems, it is only an example, and channel measurement system according to the present invention can be n * n system, and wherein n is greater than 2 integer.This means that the antenna configuration that channel measurement system according to the present invention is supported can be by utilizing more transmitter and receiver to increase smoothly.
In receiver side, the receiver RF front-end module 307 of communication system 300 receives RF test signal from receiver antenna array 306, and is down-converted to IF, down-converts to subsequently baseband signal (simulation) again.Modulus (A/D) transducer 308 converts this Analog Baseband test signal to digital form, and sends it to the signal processor 309 of channel measurement system 350.309 pairs of each test signals that receive from different receiver antennas respectively of signal processor are analyzed.In one embodiment, signal processor 309 comprises channel estimating unit (not shown), this channel estimating unit is for the test signal based on received, by utilizing commercially available channel estimation method such as LS (least square method), MMSE (least mean-square error) to calculate the right transient state channel frequency response (or CIR) of each transmitter and receiver antenna.In addition, signal processor 309 also comprises channel reconstruction unit (not shown), and this channel reconstruction unit carrys out the channel between reconstruct transmitter antenna array 305 and receiver antenna array 306 on time shaft for CIR based on being obtained by channel estimating unit.For example, channel reconstruction unit can calculate the channel frequency response of each subcarrier on time shaft, and the result of calculating gained is sent to receiver control computer 310, to show as required and/or further to process.In another embodiment, signal processor 309 is only carried out for obtaining the channel estimating of CIR, and the CIR of gained is sent to receiver control computer 310 for channel reconstruction.Module 301-302 has formed the transmitter subsystem of channel measurement system 350, and module 309-310 has formed the receiver subsystem of channel measurement system 350.
Channel measurement system 350 as shown in Figure 3 also comprises synchronization subsystem 320, and synchronization subsystem 320 is in order to control the timing (timing) of the sending and receiving of test signal, thereby makes it possible to carry out accurate channel measurement and reconstruct.As shown in Figure 3, synchronization subsystem 320 comprises for the transmitter isochronous controller 321 of generating period transmitter triggering signal with for the receiver isochronous controller 322 of generating period receiver triggering signal.Transmitter RF front-end module 304 communicates with transmitter isochronous controller 321, and synchronously periodically to transmitter antenna array 305, sends test massage with transmitter triggering signal.Receiver RF front-end module 307 communicates with receiver isochronous controller 322, and synchronously via receiver antenna array 306, periodically obtains test signal with receiver triggering signal.
As shown in Figure 3, transmitter isochronous controller 321 comprises that transmitter clock unit 331 and transmitter trigger generation unit 332, wherein, transmitter clock unit 331 provides transmitter clock signal, and the clock signal of transmitter triggering generation unit 332 based on being provided by transmitter clock unit 331 generates transmitter triggering signal.Similarly, receiver isochronous controller 322 comprises that receiver clock unit 333 and receiver trigger generation unit 334, wherein, receiver clock unit 333 provides receiver clock signal, and the clock signal of receiver triggering generation unit 334 based on being provided by receiver clock unit 333 generates receiver triggering signal.According to one embodiment of present invention, transmitter clock unit 331 and receiver clock unit 333 are pre-calibrated, thereby make before measurement starts them just synchronous.In one embodiment, two clock units are all GPS (global positioning system) receivers from satellite reception temporal information.In another embodiment, transmitter clock unit 331 and receiver clock unit 333 are the rubidium clocks through pre-calibration.No matter be any, all without utilize cable to connect transmitter-side and receiver side for synchronous object.Although transmitter triggering signal and receiver triggering signal are generated respectively, by using through synchronous transmitter clock unit and receiver clock unit, transmitter triggering signal and receiver triggering signal are synchronous.
Fig. 4 A schematically shows the example of the transmission timing of test signal.In the example shown in Fig. 4 A, test signal comprises test frame 401, and as shown in the black square in figure, test frame 401 meets predetermined communication standard.Described communication standard can be by accepted standard in the actual communication system being designed.In one embodiment, predetermined communication standard is 802.11n standard.But this is only an example, and any other public and/or application specific standard (private standard) can be used.
As visible from Fig. 4 A, every reception one transmitter triggering signal 403 (arrow shown in reference diagram), just sends a 802.11n test frame 401.In one embodiment, the periodicity of test frame sends can be by realizing with RF switch, and described RF switch is just connected a predetermined amount of time when receiving a triggering signal 403, and turn-off after this predetermined amount of time finishes.In one embodiment, described predetermined amount of time is set to larger than or equals to send the time that a complete test frame spends.Do not build superframe, and each 802.11n test frame can be used to channel measurement.In Fig. 4 A, silence period (that is, the time period between adjacent standard compliant test frame) is as shown in the white square 402 in figure.
As mentioned above, transmitter triggering signal is synchronizeed with receiver triggering signal.That is, transmitter triggering signal and receiver triggering signal are sent out simultaneously, thereby make receiver when transmitter sends signal frame, start lock-on signal frame.Fig. 4 B schematically shows the reception timing of test signal.As shown in Figure 4 B, when a receiver triggering signal 403 is received, a test frame 401 is obtained.But, because propagating into receiver antenna from transmitter antenna, test frame spent a period of time (that is, propagation delay), and therefore, the signal obtaining comprises additional silence period 404, as shown in Figure 4 B.In other words, receiver is not to start to receive this test frame from the first bit of test frame, but first receives one section of noise signal corresponding with propagation delay.When signal processor 309 as shown in Figure 3 receives the first frame of test signal, it is estimated the time span (propagation delay) between the timing of the first receiver triggering signal and the first bit of the first test frame by synchronizing software program.It will be apparent to those skilled in the art that, can use any conventional synchronizing software program.Therefore, by utilization, estimate the propagation delay of gained, can determine the position of the first bit of the first test frame, that is, and the position that this test signal is actual initial.
Obtaining the starting point of the first test frame (that is, the first bit) afterwards, by using the cycle of triggering signal can also determine the starting point of all other test frames.This makes without utilizing synchronized algorithm to detect the starting point of each test frame as conventional channel measuring system, and has eliminated the time migration that the synchronized algorithm by the preamble sequence of use test frame causes, i.e. synchronous error.
In one embodiment, can obtain by the periodicity that RF switch is realized test frame, described RF switch is just connected a predetermined amount of time when receiving a triggering signal 403, and turn-offs after this predetermined amount of time finishes.In this embodiment, predetermined amount of time is set to larger than or equals to obtain the time that a complete test frame spends.In one embodiment, signal processor 309 (with reference to figure 3) comprises buffer (not shown), and this buffer is for storing obtained signal.It should be noted that the signal at every turn storing in buffer all should comprise complete test frame, for further processing.
Fig. 5 schematically show estimate gained and at the corresponding transient state channel impulse response of the channel between a pair of antenna (that is, the channel between transmitter antenna array 305 antenna and an antenna of receiver antenna array 306).As shown in Figure 5, the timing of triggering signal 403 is corresponding with the cir value of estimating gained.That is the transient state characteristic of channel of timing place when, each estimates that the cir value of gained is characterized in corresponding transmitter/receiver triggering signal and is generated.
As shown in Figure 5, because the timing of triggering signal is known, and adjacent test frame for estimating that the interval between the starting point (the first bit of lead code) of the targeting sequencing of CIR is constant, so the synchronous error being caused by synchronized algorithm can be compensated, thereby can obtain the absolute time of each measured channel impulse response.This CIR of greatly having alleviated the estimation gained being caused by synchronous error as measure in solution in conventional channel skew in time.
The frequency of transmitter triggering signal and receiver triggering signal should be higher than Doppler frequency.In order to obtain the Accurate Reconstruction of channel by interpolation (interpolation), the frequency (that is, the inverse in triggering signal cycle) that generates transmitter triggering signal and receiver triggering signal should be higher than the twice of Doppler frequency.For example, if receiver moves with the speed of 30km/h, and carrier frequency is 2.4GHz, and maximum doppler frequency is about 120Hz.In this case, synchro system should send with the frequency higher than 240Hz transmitter triggering signal and receiver triggering signal.The frequency of transmitter triggering signal and receiver triggering signal (that is, the inverse in triggering signal cycle) can adjust to meet sampling thheorem by synchro system 320.
Fig. 6 shows the simplified flow chart of the operation that the transmitter-side of the wireless MIMO communication system as shown in Figure 3 according to an embodiment of the invention carries out by the channel measurement system of Fig. 3.As shown in Figure 6, the operation of transmitter-side, from step 601, in step 601, is controlled computer 301 (with reference to figure 3) by the transmitter of measuring system 350 and is generated modulation symbol (modulatedsymbol).In one embodiment, modulation symbol generates based on voice communication data.Use voice communication data by the channel measurement of being convenient between radio base station and mobile phone, and can use according to actual needs the data of any kind.
In step 602, utilize modulation symbol to form grouping.In step 603, by inserting lead code, form standard compliant test frame.According to the present invention, test frame can (for example, 802.11n) form, and test dedicated frame or superframe without forming according to preassigned.Especially, can according to the identical standard of the standard of using in the communication system of being concerned about in reality is built to test frame.Based on this point, channel measurement system according to the present invention is very flexibly.In addition, preassigned is not limited to common standard, and can be any public and application specific standard such as 802.11n, WiMax, 3GPP LTE.
Should understand, the lead code being inserted in the test frame that the transmitter antenna by different is sent is orthogonal.Therefore, different transmitter and receiver antennas between channel impulse response can measure simultaneously.Those skilled in the art are very clear, can use any orthogonalization technology.
In step 604, test frame is written into signal generator 302 (with reference to figure 3), and then signal generator 302 generates digital baseband waveform signal based on this test signal.RF is changed and be up-converted to digital baseband waveform signal through D/A subsequently in step 605.In step 606, test frame is synchronously periodically sent by the transmitter triggering signal of the controller 321 with from shown in Fig. 3.Particularly, test frame is sent out in timing place by the appointment of transmitter triggering signal, and the interval between adjacent test frame, i.e. in the cycle of transmitter triggering signal, can adjust to meet sampling thheorem by synchronization subsystem 320 (with reference to figure 3).After test frame is sent out away, the EO of transmitter-side.
The receiver square tube that Fig. 7 shows the wireless MIMO communication system as shown in Figure 3 according to an embodiment of the invention is crossed the simplified flow chart of the operation that the channel measurement system of Fig. 3 carries out.As shown in Figure 7, the operation of receiver side is from step 701, and in step 701, test frame is synchronously periodically received with receiver triggering signal.In step 702, the test signal receiving is downconverted to base band, and through A/D conversion, thereby from received test signal, recover test frame.
In step 703, signal processor 309 (with reference to figure 3) is carried out channel estimating by calculating the channel impulse response (CIR) of each test frame receiving.Before carrying out described calculating, need to detect the starting point of test frame, reason is to exist propagation delay.As mentioned above, the starting point of the first test frame can be detected and be obtained by synchronized algorithm, and the starting point of other test frame can utilize the cycle of emittor/receiver triggering signal to determine.Can utilize such as the channel estimation method of LS (least square method), MMSE (least mean-square error) etc. and estimate channel.
In step 704, by the interpolation on time shaft, carry out reconstruct channel.Because channel measurement result (that is, cir value) is to calculate by the lead code with each test frame, so calculate the cir value of gained, on time shaft, be discrete.Yet, by the interpolation of cir value, can obtain CIR curve continuous on time shaft, that is, and reconstruct channel accurately.In addition, can calculate the channel frequency response on each subcarrier according to cir value, similarly, can obtain channel frequency response curve continuous on time shaft.
As mentioned above, estimate that each cir value of gained and each timing of triggering signal are corresponding.Thus, can eliminate the time migration being caused by the synchronized algorithm that utilizes the preamble sequence of test frame, i.e. synchronous error.The interpolation method using in channel reconstruction includes but not limited to linear interpolation.
As shown in Figure 7, after step 704, the processing in receiver side finishes.But, it will be understood by those skilled in the art that except those operations shown in Fig. 7, can also carry out other operation such as any other analysis of the test frame execution to received.
System and method for channel measurement of the present invention does not all have strict requirement to the instrument using in transmitter-side and receiver side.According to different measurement environment, the different piece of measuring system can utilize user's equipment and system to replace.For example, if the measurement of the performance of the antenna that user will soon use them is interested, the transmitter antenna of measuring system and receiver antenna can utilize user's antenna to replace, and without the antenna that uses specialized designs or accurate calibration.As another example, if it is interested that user aligns in use the channel measurement of (in-service), whole transmitter-side can utilize base station or user's mobile terminal to replace, and receiver side can install the antenna through accurate calibration as conventional channel measuring system simultaneously.As long as RF front end has the interface interconnecting with synchro system, and can carry out sending and receiving test signal in response to triggering signal.
Yet, it should be noted that, according to channel measurement system of the present invention, can also use together with thering is the larger aerial array of more antennas with RF switch, to obtain the better certainty of measurement to the angle parameter such as angle of arrival (directionof arrival) etc.In this case, each antenna array partition need to be several groups, each group all has the antenna of similar number, and RF switch circulates and connects each antenna sets with fixed intervals.
In order to improve further the accuracy according to channel measurement of the present invention, can carry out some and further improve.In one embodiment, except lead code part, the payload of standard compliant test frame (payload) is also used to the measurement of channel impulse response.Particularly, in the payload of test frame, insert custom-designed sequence.For example, the permanent envelope repeating zero auto-correlation (CAZAC:Constant Amplitude Zero Auto Correlation) sequence is inserted in 802.11n frame as custom-designed payload.The constant envelope of the payload consisting of the CAZAC sequence repeating makes multi-subcarrier system have very low peak-to-average power ratio (PARR:Peak AveragePower Ratio), and its good correlation properties are conducive to synchronous and channel estimating.
By the CAZAC sequence to received, be averaging, can improve the performance of the channel estimating under low signal-to-noise ratio.If fast change of channel, and/or signal to noise ratio is very low, can increase the number of the CAZAC sequence being inserted in payload, to improve further the performance of channel estimating.It should be noted that the custom-designed sequence being inserted in payload is not limited to CAZAC sequence, and can use various types of sequences in channel estimating with fine performance.
By using said method, that is, except lead code part, also the payload with standard compliant test frame is carried out channel estimating, and the performance of channel estimating is further improved, thereby can obtain more accurate channel measurement result.This is very useful for network designer in other useful information obtaining such as channel capacity.Channel capacity represents maximum zero defect (error-free) data transfer rate of per unit bandwidth, and it is very suitable for characterizing MIMO performance, and is very useful for the design of mimo system.According to the present invention, can obtain accurate measurement result, thereby can accurately calculate channel capacity.
In the situation that not departing from spirit of the present invention or essential characteristics, can realize the present invention by other concrete forms.Therefore, it is schematic and nonrestrictive that above-described embodiment all should be considered to from every side, scope of the present invention is not by illustrating above but limited by claims, and therefore, the institute in the scope of the equivalent of claims changes and all should comprise within the scope of the present invention.
Claims (10)
1. the channel measurement system for wireless multi-input multi-output communication system, described wireless multi-input multi-output communication system has transmitter antenna array and receiver antenna array, passage from an antenna of described transmitter antenna array to an antenna of described receiver antenna array forms channel, and described channel measurement system comprises:
Transmitter subsystem, described transmitter subsystem is in order to generate test frame, and described test frame is synchronously sent via described transmitter antenna array and transmitter triggering signal;
Receiver subsystem, described receiver subsystem is in order to synchronously to receive the test frame from described transmitter antenna array via receiver antenna array and receiver triggering signal, and estimate each channel by calculating the channel impulse response of each test frame receiving, described channel impulse response is corresponding with the timing of described transmitter triggering signal and receiver triggering signal; And
Synchronization subsystem, described synchronization subsystem is in order to generate described transmitter triggering signal and receiver triggering signal synchronized with each other, wherein
Described receiver subsystem is estimated the propagation delay of test frame, and the cycle of the propagation delay based on estimating and described receiver triggering signal is determined the starting point of all test frames that receive.
2. channel measurement system as claimed in claim 1, wherein described in each, triggering signal is periodic signal, wherein, described synchronization subsystem also comprises:
Transmitter clock unit, described transmitter clock unit is in order to generate transmitter clock signal;
Receiver clock unit, described receiver clock unit through pre-calibration and with described transmitter clock units synchronization, this receiver clock unit is in order to generate the receiver clock signal synchronize with described transmitter clock signal;
Transmitter triggers generation unit, and described transmitter triggers generation unit and described transmitter clock unit is coupled, in order to generate described transmitter triggering signal based on described transmitter clock signal; And
Receiver triggers generation unit, and described receiver triggers generation unit and described receiver clock unit is coupled, in order to generate the described receiver triggering signal of synchronizeing with described transmitter triggering signal based on described receiver clock signal.
3. channel measurement system as claimed in claim 2, wherein, the frequency of described transmitter triggering signal and described receiver triggering signal is set to larger than the twice of the Doppler frequency of described channel.
4. channel measurement system as claimed in claim 3, wherein, described in each, test frame meets predetermined communication standard, and the lead code of the test frame sending from different transmitter antennas is orthogonal.
5. channel measurement system as claimed in claim 3, wherein, described receiver subsystem also comprises signal processor, described signal processor carrys out channel described in reconstruct in order to the test frame based on received.
6. channel measurement system as claimed in claim 5, wherein, the described channel reconstruction of described signal processor is by calculating the transient state channel impulse response of each channel, and by interpolation, on time shaft, each channel of reconstruct carries out based on described channel impulse response.
7. for measuring a method for the channel of wireless multi-input multi-output communication system, between antenna of described channel in transmitter antenna array and an antenna in receiver antenna array, form, described method comprises:
Generate test frame;
Via described transmitter antenna array and transmitter triggering signal, synchronously send described test frame;
Via described receiver antenna array and receiver triggering signal, synchronously receive described test frame, described receiver triggering signal is synchronizeed with described transmitter triggering signal;
Estimate the propagation delay of described test frame, and the cycle of the propagation delay based on estimating and described receiver triggering signal is determined the starting point of all test frames that receive; And
By calculating the channel impulse response of each test frame receiving, estimate described channel, wherein, described channel impulse response is corresponding with the timing of described transmitter triggering signal and receiver triggering signal.
8. method as claimed in claim 7, wherein, described transmitter triggering signal and described receiver triggering signal frequency are separately set to larger than the twice of the Doppler frequency of described channel.
9. method as claimed in claim 8, also comprises based on described channel impulse response and carrys out on time shaft channel described in reconstruct by interpolation.
10. method as claimed in claim 7, wherein, described in each, test frame meets predetermined communication standard, and the lead code of the described test frame sending from different transmitter antennas is orthogonal.
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| CN200710142584.6A CN101378278B (en) | 2007-08-29 | 2007-08-29 | Channel measurement for wireless multi-input multi-output communication system |
| DE102008040898A DE102008040898A1 (en) | 2007-08-29 | 2008-07-31 | Channel measuring system for wireless multi-input-multi output data transmission system, has synchronization sub-system producing transmitter and receiver starting signals that are synchronous to each other |
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| CN200710142584.6A CN101378278B (en) | 2007-08-29 | 2007-08-29 | Channel measurement for wireless multi-input multi-output communication system |
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| CN111835434B (en) * | 2019-04-19 | 2022-07-05 | 深圳市鼎阳科技股份有限公司 | Method and device for measuring broadband frequency response |
| CN111181660A (en) * | 2020-01-22 | 2020-05-19 | 南京捷希科技有限公司 | Channel simulation device and method |
| CN111431635B (en) * | 2020-03-05 | 2022-08-26 | 西安宇飞电子技术有限公司 | Broadband signal self-calibration method and device |
| CN112165373B (en) * | 2020-09-03 | 2022-07-29 | 国网江西省电力有限公司经济技术研究院 | Power distribution MIMO power line communication multi-terminal transmission method |
| CN114325134B (en) * | 2021-12-30 | 2024-05-31 | 北京交大思诺科技股份有限公司 | Automatic test system for frequency response characteristics of locomotive signal receiving antenna |
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| CN1525681A (en) * | 2003-02-27 | 2004-09-01 | ��ʽ���������Ƽ� | Communication device possessing trouble detection function |
| CN1914870A (en) * | 2003-12-05 | 2007-02-14 | 高通股份有限公司 | Multi-antenna system to simultaneous support of MISO and MIMO receivers |
| WO2006092462A1 (en) * | 2005-03-01 | 2006-09-08 | Elektrobit System Test Oy | A method, device arrangement, transmitter unit and receiver unit for generating data characterising mimo environment |
| CN1917397A (en) * | 2006-09-19 | 2007-02-21 | 北京邮电大学 | Method for estimating channel in MIMO-OFDM system |
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| DE102008040898A1 (en) | 2009-03-05 |
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