CN101378278A - Channel measurement for wireless multi-input multi-output communication system - Google Patents
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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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
The MIMO communication system typically is 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 the 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 the measurement 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 the channel intercepting method.As can be seen from Fig. 1, transmitter control 103 pairs of transmitter wireless devices of computer (radio) 101 are controlled to generate pumping signal according to the 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 transmitter antenna location automatics (robot) 102 subsequently.Transmitter antenna location automatics 102 is subjected to the control of transmitter control computer 103, with the location of a plurality of antennas of being located at transmitter-side automatically, and sends pumping signal by radio channel.
In receiver side, the receiver antenna location automatics 104 that is subjected to the control of receiver control computer 106 receives pumping signal, and this pumping signal is sent to receiver wireless device 105.The 105 pairs of pumping signals that received of receiver wireless device are carried out down-conversion and modulus (A/D) conversion from RF to the base band frequency, thereby and the digital signal that will generate be sent to receiver control computer 106.106 pairs of these digital signals of receiver control computer are analyzed to obtain estimation, channel capacity and other parameter of channel measurement result, channel impulse response (CIR).
Fig. 2 shows the frame structure of the pumping signal of using in measuring system shown in Figure 1.This pumping signal is used as " superframe " and sends.As shown in Figure 2, each " superframe " all has a channel and intercepts grouping 201 and several subsequently packet 203, is inserted with (the silence period) 202 that mourn in silence the period between any two adjacent packets.It is that specialized designs is used for the transient state channel measurement that channel is intercepted grouping 201, is also referred to as " intercepting frame ".In receiver side, receiver control computer 106 (with reference to figure 1) uses channel estimation method to carry out channel estimating to being included in each lead code (preamble) part of intercepting in the frame 201, to obtain the transient state channel impulse response that each intercepts frame 201.For the remainder (promptly mourn in silence period 202 and packet 203) of superframe, supposed the quasistatic situation.That is, suppose that radio channel does not change in the transmission course of packet.
But a problem that is associated with above-mentioned measuring system is not carry out between transmitter and receiver synchronously.In addition, the lead code that is used for channel estimating is only by utilizing synchronized algorithm to obtain, and synchronized algorithm can be introduced synchronous error, and the result causes measured channel impulse response to be offset in time.Therefore, said system can't provide the accurate measurement of Doppler frequency spectrum.
Another problem is that configuration as depicted in figs. 1 and 2 only can provide and " intercepting frame " corresponding transient state channel estimating.And, supposed the quasistatic situation for packet.When fast change of channel, this hypothesis will be introduced measure error.In addition, the configuration of above-mentioned prior art can't provide other statistical property such as Doppler frequency deviation and PDP (Power Delay Profile, power delay spectrum) and so on.These problems cause can't 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 the 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 from transmitter antenna array acceptance test frame, and is estimated each channel by the channel impulse response that calculates each test frame that is received via receiver antenna array and receiver triggering signal.Described channel impulse response is corresponding with the timing of transmitter triggering signal and receiver triggering signal.Synchronization subsystem generates transmitter triggering signal and receiver triggering signal synchronized with each other.
Description of drawings
When reading in conjunction with the accompanying drawings following content, can understand above-mentioned and further feature of the present invention more completely, wherein:
Fig. 1 shows the configuration of the prior art that is used to measure the response of transient state mimo channel;
Fig. 2 shows the frame structure of the pumping signal of using in measurement configuration shown in Figure 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 transmission example regularly of test signal;
Fig. 4 B shows the reception example regularly of test signal;
Fig. 5 show estimate gained and a pair of antenna between the corresponding transient state channel impulse response of channel;
The simplified flow chart of the operation that the channel measurement system of the transmitter-side that Fig. 6 shows the wireless MIMO communication system as shown in Figure 3 according to an embodiment of the invention by Fig. 3 carries out;
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), and wherein, transmitter-side is in order to generating and sending signal of communication, and receiver side comes 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.Replacedly, can use more than two antennas or be less than two antennas and form each aerial array 305-306.All modules of Fig. 3 and 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 be used for accurately measuring and reconstruct at the transmitter-side of system 300 and the channel between the receiver side.Below will do more detailed description to this.
Just as seen in Figure 3, channel measurement system 350 comprises transmitter control computer 301, transmitter control computer 301 generates 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 communicates with transmitter control computer 301, and generate separately with the test signal sequence that is generated in corresponding two digital baseband waveform signals.The digital baseband waveform signal is sent to digital-to-analogue (D/A) transducer 303 of communication system 300 subsequently, and is converted into the Analog Baseband test signal in D/A converter 303.Transmitter radio frequency (RF) front-end module 304 of communication system 300 receives this Analog Baseband test signal subsequently, upconverts it to intermediate frequency (IF), upconverts to radio frequency subsequently again, sends with each antenna by transmitter antenna array 305 respectively.
For simplicity, signal generator 302, D/A converter 303 and transmitter RF front end 304 are illustrated among Fig. 3 as handling the individual devices of double-channel signal respectively.But the channel measurement system can have two signal generators, two D/A converters and two transmitter RF front-end modules, to handle test signal respectively.Identical situation also is useful in subsequently with the device in the receiver side of describing.In addition, though figure 3 illustrates 2 * 2 systems, it only is an example, can be n * n system according to channel measurement of the present invention system, and wherein n is the integer greater than 2.This means that the antenna configurations of being supported according to channel measurement of the present invention system can increase smoothly by utilizing more transmitter and receiver.
In receiver side, the receiver RF front-end module 307 of communication system 300 receives the RF test signal from receiver antenna array 306, and it is down-converted to IF, down-converts to baseband signal (simulation) subsequently 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 the channel estimating unit (not shown), this channel estimating unit is used for based on the test signal that is received, and calculates the right transient state channel frequency response (or CIR) of each transmitter and receiver antenna by utilizing commercially available channel estimation method such as LS (least square method), MMSE (least mean-square error).In addition, signal processor 309 also comprises channel reconstruction unit (not shown), and this channel reconstruction unit is used for based on the channel that is come by the CIR that channel estimating unit obtained between reconstruct transmitter antenna array 305 on the time shaft and receiver antenna array 306.For example, the channel reconstruction unit can calculate the channel frequency response of each subcarrier on time shaft, and the result that will calculate gained sends to receiver control computer 310, to show as required and/or further to handle.In another embodiment, signal processor 309 is only carried out the channel estimating that is used to obtain CIR, and the CIR of gained is sent to receiver control computer 310 to be used 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.
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 the transmitter clock signal, and transmitter triggering generation unit 332 generates the transmitter triggering signal based on the clock signal that is provided by transmitter clock unit 331.Similarly, receiver isochronous controller 322 comprises that receiver clock unit 333 and receiver trigger generation unit 334, wherein, receiver clock unit 333 provides the receiver clock signal, and receiver triggering generation unit 334 generates the receiver triggering signal based on the clock signal that is provided by receiver clock unit 333.According to one embodiment of present invention, transmitter clock unit 331 and receiver clock unit 333 are pre-calibrated, thereby make that they are just synchronous before measuring beginning.In one embodiment, two clock units all are GPS (global positioning system) receivers from the satellite receiving time 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 need not to utilize cable to connect transmitter-side and receiver side for synchronous purpose.Though 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 transmission example regularly of test signal.In the example shown in Fig. 4 A, test signal comprises test frame 401, and shown in the black square among the figure, test frame 401 meets predetermined communication standard.Described communication standard can be an accepted standard in the actual communication system that will be designed.In one embodiment, Yu Ding communication standard is the 802.11n standard.But this only is 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 the reference diagram) just sends a 802.11n test frame 401.In one embodiment, the periodicity of test frame sends and can realize that described RF switch is just connected a predetermined amount of time when receiving a triggering signal 403 by using the RF switch, and finishes the back at this predetermined amount of time and turn-off.In one embodiment, described predetermined amount of time is set to larger than or equals to send the time that complete test frame spent.Do not make up superframe, and each 802.11n test frame can be used to channel measurement.In Fig. 4 A, mourn in silence the period (that is the time period between the adjacent standard compliant test frame) shown in the white square among the figure 402.
As mentioned above, transmitter triggering signal and receiver triggering signal are synchronous.That is, transmitter triggering signal and receiver triggering signal are sent out simultaneously, thereby make receiver begin the lock-on signal frame when transmitter sends signal frame.Fig. 4 B schematically shows the reception timing of test signal.Shown in Fig. 4 B, when a receiver triggering signal 403 was received, a test frame 401 was obtained.But because test frame propagates into receiver antenna from transmitter antenna and spent a period of time (that is, propagation delay), therefore, the signal that is obtained comprises additional mourning in silence the period 404, shown in Fig. 4 B.In other words, receiver is not that first bit from test frame begins to receive this test frame, but at first receive one section with the corresponding noise signal of propagation delay.When as shown in Figure 3 signal processor 309 received first frame of test signal, it used synchronizing software program to come the time span (propagation delay) between first bit of the timing of the first receiver triggering signal and first test frame is estimated.What it will be apparent to those skilled in the art that is to use any conventional synchronizing software program.Therefore,, can determine the position of first bit of first test frame by utilizing the propagation delay of estimating gained, that is, and the position that this test signal is actual initial.
In the starting point that obtains first test frame (that is, first bit) afterwards, can also determine the starting point of all other test frames by the cycle of using triggering signal.This makes and need not to utilize as the conventional channel measuring system synchronized algorithm to detect the starting point of each test frame, and has eliminated the time migration that synchronized algorithm caused by the preamble sequence of use test frame, i.e. synchronous error.
In one embodiment, can use the RF switch to realize that the periodicity of test frame obtains, described RF switch is just connected a predetermined amount of time when receiving a triggering signal 403, and shutoff 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 complete test frame spent.In one embodiment, signal processor 309 (with reference to figure 3) comprises the buffer (not shown), and this buffer is used to store the signal that is obtained.Should be noted that the signal that at every turn stores in the buffer all should comprise complete test frame, to be used 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 the antenna of transmitter antenna array 305 antenna and 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, each estimates that the cir value of gained is characterized in the transient state characteristic of channel of timing place of corresponding transmitter/when the receiver triggering signal is generated.
As shown in Figure 5, because the timing of triggering signal is known, and being used to of adjacent test frame estimates between the starting point (first bit of lead code) of targeting sequencing of CIR to be constant at interval, so the synchronous error that is caused by synchronized algorithm can be compensated, thereby can obtain the absolute time of each measured channel impulse response.This has greatly alleviated the CIR skew in time of the estimation gained that is caused by synchronous error as measure in the solution in conventional channel.
The frequency of transmitter triggering signal and receiver triggering signal should be higher than Doppler frequency.In order to obtain the accurate reconstruct 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 then maximum doppler frequency is about 120Hz.In this case, synchro system should send transmitter triggering signal and receiver triggering signal with the frequency that is higher than 240Hz.The frequency of transmitter triggering signal and receiver triggering signal (that is the inverse in triggering signal cycle) can be adjusted to satisfy sampling thheorem by synchro system 320.
The simplified flow chart of the operation that the channel measurement system of the transmitter-side that Fig. 6 shows the wireless MIMO communication system as shown in Figure 3 according to an embodiment of the invention by Fig. 3 carries out.As shown in Figure 6, the operation of transmitter-side, is controlled computer 301 (with reference to figure 3) by the transmitter of measuring system 350 and is generated modulation symbol (modulatedsymbol) in step 601 from step 601.In one embodiment, modulation symbol is based on that voice communication data generates.The use voice communication data will be convenient to the channel measurement between radio base station and the mobile phone, and can use the data of any kind of according to actual needs.
In step 602, utilize modulation symbol to form grouping.In step 603, form standard compliant test frame by inserting lead code.According to the present invention, test frame can (for example, 802.11n) form, and need not to form test dedicated frame or superframe according to preassigned.Especially, can make up test frame according to the standard identical with the standard that will in the communication system that reality is concerned about, use.Based on this point, be very flexibly according to channel measurement of the present invention system.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 that is inserted in the test frame that will send by different transmitter antennas 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 signal generator 302 generates the digital baseband waveform signal based on this test signal then.RF is changed and be up-converted to the digital baseband waveform signal through D/A subsequently in step 605.In step 606, test frame by with synchronously periodically send from the transmitter triggering signal of controller shown in Figure 3 321.Particularly, test frame is sent out in timing place by the appointment of transmitter triggering signal, and the interval between the adjacent test frame, i.e. in the cycle of transmitter triggering signal, can adjust to satisfy 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 the receiver triggering signal.In step 702, the test signal that is received is downconverted to base band, and through the A/D conversion, thereby from the test signal that is received, recover test frame.
In step 703, signal processor 309 (with reference to figure 3) is carried out channel estimating by the channel impulse response (CIR) that calculates each test frame that is received.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 first test frame can detect by synchronized algorithm and obtain, 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, come the reconstruct channel by the interpolation on time shaft.Because channel measurement result (that is, cir value) is to calculate by the lead code of using each test frame, on time shaft, disperse so calculate the cir value of gained.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 channel frequency response on each subcarrier, similarly, can obtain channel frequency response curve continuous on the time shaft according to cir value.
As mentioned above, each cir value of estimation gained is corresponding with each timing of triggering signal.Thus, can eliminate the time migration that the synchronized algorithm by the preamble sequence that utilizes test frame causes, i.e. synchronous error.The interpolation method that uses 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 Figure 7, can also carry out other operation such as any other analysis that the test frame that is received is carried out.
The system and method for channel measurement that is used for of the present invention is not to all there being strict requirement at the employed instrument of 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 the user be about to use them is interested, then the transmitter antenna of measuring system and receiver antenna can utilize user's antenna to replace, and need not to use the specialized designs or the accurate antenna of calibration.As another example, if it is interested that the user aligns in use the channel measurement of (in-service), then whole transmitter-side can utilize base station or user's portable terminal to replace, and receiver can be to install the antenna through accurate calibration as the conventional channel measuring system simultaneously.As long as the RF front end has the interface that interconnects with synchro system, and can send with the acceptance test signal in response to triggering signal and get final product.
Yet, it should be noted that, can also use with RF switch and the bigger aerial array with more antennas according to channel measurement of the present invention system, to obtain better certainty of measurement such as the angle parameter of the angle of arrival (directionof arrival) etc.In this case, each antenna array partition need be several groups, each group all has the antenna of similar number, and the RF switch circulates with fixed intervals and connects each antenna sets.
In order to improve accuracy further, can carry out some further improvement according to channel measurement of the present invention.In one embodiment, except the lead code part, the payload of standard compliant test frame (payload) also is used to the measurement of channel impulse response.Particularly, in the payload of test frame, insert custom-designed sequence.For example, permanent envelope zero auto-correlation (the CAZAC:Constant Amplitude Zero Auto Correlation) sequence that repeats is inserted in the 802.11n frame as custom-designed payload.The constant envelope of the payload that is made of the CAZAC sequence that repeats makes the multi-subcarrier system have very low peak-to-average power ratio (PARR:Peak AveragePower Ratio), and its good correlation properties help synchronously and channel estimating.
By the CAZAC sequence that is received is asked on average, can improve the performance for estimating channel under low signal-to-noise ratio.If fast change of channel, and/or signal to noise ratio is very low then can increase the number of the CAZAC sequence that is inserted in the payload, to improve performance for estimating channel further.Should be noted that the custom-designed sequence that is inserted in the payload is not limited to the CAZAC sequence, and can use the various types of sequences that in channel estimating, have fine performance.
By using said method, that is, except the lead code part, also use the payload of standard compliant test frame to carry out channel estimating, performance for estimating channel is further improved, thereby can obtain more precise channels measurement result.This is very useful for network designer in other useful information that obtains such as channel capacity.Channel capacity is represented maximum zero defect (error-free) data transfer rate of per unit bandwidth, and it is very suitable for characterizing the 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.
Under the situation that does not break away 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 the foregoing description all should be considered to from every side, scope of the present invention is not by above explanation 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. channel measurement system that is used 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 the channel impulse response that calculates each test frame received, 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.
2. channel measurement as claimed in claim 1 system, wherein each described triggering signal all is a periodic signal, wherein, described synchronization subsystem also comprises:
The transmitter clock unit, described transmitter clock unit is in order to generate the 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 with described transmitter clock signal Synchronization;
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 synchronous with described transmitter triggering signal based on described receiver clock signal.
3. channel measurement as claimed in claim 2 system, 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 as claimed in claim 3 system, wherein, each described test frame all meets predetermined communication standard, and the lead code of the test frame that sends from different transmitter antennas is orthogonal.
5. channel measurement as claimed in claim 3 system, wherein, described receiver subsystem also comprises signal processor, described signal processor is in order to come the described channel of reconstruct based on the test frame that is received.
6. channel measurement as claimed in claim 5 system, wherein, the described channel reconstruction of described signal processor is by calculating the transient state channel impulse response of each channel, and each channel of reconstruct carries out on time shaft by interpolation based on described channel impulse response.
7. method that is used to measure the channel of wireless multi-input multi-output communication system, described channel in transmitter antenna array antenna and an antenna in the receiver antenna array between form, described method comprises:
Generate test frame;
Synchronously send described test frame via described transmitter antenna array and transmitter triggering signal;
Synchronously receive described test frame via described receiver antenna array and receiver triggering signal, described receiver triggering signal and described transmitter triggering signal are synchronous; And
Estimate described channel by the channel impulse response that calculates each test frame that is received, 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, the frequency of each described triggering signal is 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 comes the described channel of reconstruct on time shaft by interpolation.
10. method as claimed in claim 7, wherein, each described test frame all meets predetermined communication standard, and the lead code of the described test frame that sends from different transmitter antennas is orthogonal.
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| 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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| CN101378278B (en) | 2014-08-06 |
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