CN1585308A - Multipath analog system and method - Google Patents
Multipath analog system and method Download PDFInfo
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- CN1585308A CN1585308A CNA031551483A CN03155148A CN1585308A CN 1585308 A CN1585308 A CN 1585308A CN A031551483 A CNA031551483 A CN A031551483A CN 03155148 A CN03155148 A CN 03155148A CN 1585308 A CN1585308 A CN 1585308A
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Abstract
The method applies the darkroom of the electric wave to avoid the interfere of electro-magnetic, and other uncontrollable signal transmitting directory generated in the test. The signal distributor is adjusted into multiple simulated signals to simulate the attenuation, and the delay of the signal generated in the multiple directory transmitting. In the darkroom of the electric wave, the rotating flat controlled by the unit controller supports the radio communication apparatus.
Description
Technical field
The present invention relates to multi-path (multi-path) analogue system and method, be particularly related to a kind of anechoic chamber (shielded anechoic chamber) that utilizes and avoid outside electromagnetic interference, and a signal distributed be adjusted to a plurality of analog signals, to simulate the decay that this signal produces when the transmission of a plurality of paths and the multi-path analogue system and the method for delay.
Background technology
In recent years, along with advancing by leaps and bounds of wireless communication technique, mobile phone (mobile phone) and WLAN (wireless local area network; WLAN) application is also more prevalent.Compare with the entity circuit signal transmission that only has the constant transmissions path, the transmission of wireless signal has multi-path (multi-path) characteristic.So-called multi-path refers to wireless signal when spatial transmission, because the characteristic in space if any wall, barrier etc., can cause the reflection of signal, thereby has a plurality of electric wave transmission paths to exist between transmitting terminal and receiving terminal.For receiving terminal, the signal that these are arrived at by different paths, because of producing, phase deviation (phase difference) strides symbol interference (inter-symbol interference) and decay multi-path effects such as (fading) to each other, increase complexity and unsteadiness that the signal biography is received, and this multi-path effect is the phenomenon that most true environments all can exist.
Yet, for wireless telecommunications system, manufacturer as telephone bandset, phone base station, wireless network adapter (network interface card), wireless bridge (access point) or the like, mostly traditionally is to fail more accurately to grasp in the environment of test condition, as open space, come the signal sending and receiving of analog equipment, but can't provide a standing bad test report for product fully.Because in this environment, be difficult to avoid electromagnetic interference (the electromagnetic interference that comes from the outside usually; EMI) and produce unnecessary reflection path; And on the test operation of reality, also may be subject to the restriction of spatial character, and lack flexibility.Though perhaps attempt to simulate actual environment with channel simulator (channel emulator), but because of channel simulator is adopted cable mode (cable mode) test macro, the antenna of having got rid of wireless telecommunications system to be measured, can not test important antenna diversity (antenna diversity) performance, thereby can't provide complete and just and sound test report for product.Therefore, easily and effectively the mode be badly in need of really to be simulating this multi-path characteristic, and then tests its product near the strain property under the actual environment for use, with the important evidence of researching and developing as design.
Summary of the invention
In view of this, the present invention proposes a kind of multi-path analogue system and method, not only can avoid extraneous electromagnetic interference and produce unnecessary reflection path, and be not subjected to the restriction of communications space in operation, so as to reaching the purpose of simulating and controlling true electric wave space.
For achieving the above object, the invention provides a kind of multi-path analogue system, it comprises a signal generation device, in order to produce a signal; One signal analogue unit is coupled to this signal generation device, a signal can be distributed to be adjusted into N analog signal, and so as to simulating decay and the delay that produces respectively when this signal transmits in N path, wherein N is the integer greater than 1.This analogue system also comprises an anechoic chamber (shieldedanechoic chamber), and its inside comprises N antenna, is coupled to the signal analogue unit, is used for launching this N analog signal respectively.
The present invention also provides a kind of multi-path analogy method, and it comprises at least: produce a signal; This signal distribution is adjusted into N analog signal, and to simulate decay and the delay that produces respectively when this signal transmits in N path, wherein N is the integer greater than 1; Utilize N antenna to launch this N analog signal respectively, wherein this N antenna is arranged in an anechoic chamber; And utilize the communication device in the anechoic chamber to receive this N analog signal.
The present invention utilizes anechoic chamber to avoid the electromagnetic interference in the external world and the generation of unnecessary reflection path.The anechoic chamber inwall is made by special material, and signal reaches inwall, and its most of energy is absorbed, and the intensity of reflection signal can be reduced to minimum.The present invention in considering anechoic chamber, not only had living space transmission attenuation but also other Line Attenuation is arranged after, the signal that utilizes the signal analogue unit to decay and transmitted, with the decay of analog signal in the real space transmission course, transmission attenuation reaches the degree suitable with transmission delay with regard to may command like this, also the restriction of anechoic chamber size can be subjected to, thereby the signal transmission under the multiple environment can be simulated.By aforementioned means, the present invention can reach simulation true electric wave space and control the purpose in this electric wave space, more can carry out various radio experiments or measurement by this controllable simulation electric wave space, to obtain the assessment result near true environment for use.
The present invention also provides a kind of method of measuring the diversity gain (diversity gain) of communication device, this communication device has switchable single antenna pattern and antenna diversity pattern, and placing an anechoic chamber, the method comprises the following step: a. is set at the single antenna pattern with this communication device; B. produce a test signal; C. with this test signal attenuation first attenuation amplitude; D. this test signal is distributed to be adjusted into N analog signal, to simulate decay and the delay that produces respectively when this test signal transmits in N path, wherein N is the integer greater than 1; E. utilize N antenna that is arranged in anechoic chamber to launch this N analog signal; F. communication device receives this N analog signal; G. the signal parameter measuring communication device and received, a reference value; H. communication device is switched to the antenna diversity pattern, and will test signal attenuation second attenuation amplitude, so that the signal parameter that communication device received equals reference value; And i. calculates the difference of first and second attenuation amplitude, is the antenna diversity gain of communication device.
Brief Description Of Drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
In the accompanying drawing,
Figure 1A is the preferred embodiment calcspar of multi-path analogue system of the present invention;
Figure 1B is another preferred embodiment calcspar of multi-path analogue system of the present invention;
Fig. 2 is the action flow chart of the preferred embodiment of multi-path analogy method of the present invention;
Fig. 3 is utilization multi-path analogue system of the present invention, so as to measuring the action flow chart of antenna diversity gain;
Fig. 4 measures the action flow chart of another embodiment of antenna diversity gain for utilization multi-path analogue system of the present invention.
Embodiment
To describe the execution mode of multi-path analogue system of the present invention and method in detail with specific embodiment below, and an application examples of the present invention, the i.e. measurement of the diversity gain of wireless communication apparatus will be described.
Figure 1A is the preferred embodiment calcspar of multi-path analogue system of the present invention.Among the figure, multi-path analogue system 10a is used for simulating the wireless telecommunications space (N is the integer greater than 1) with N path, and it comprises: a signal generation device 11 is used for producing a signal; One signal analogue unit 12a is coupled to signal generation device 11, this signal is distributed be adjusted into N analog signal, so as to simulating decay and the delay that produces respectively when this signal transmits in this N path; One control unit 13a is coupled to signal generation device 11, with the generation of controlling signal; And an anechoic chamber 14, so as to isolated outside electromagnetic interference and the unnecessary reflection path that produces, thereby make the useless reflection effect of anechoic chamber 14 inside reduce to minimum.
In another embodiment, in this N path, select a reference path, simulating a direct path, and can omit the delay line 124 in this reference path.And, when N equals 2, in reference path, set up a phase shifter (phase shifter), for the son decay signal after attenuator 123a decay in the reference path, carry out the phase place adjustment, the phase difference when transmitting in two paths so as to analog signal.
Among Figure 1A, control unit 13a also is coupled to attenuating device 121, and attenuating device 121 can be a step attenuator (step attenuator), in a step-wise fashion adjust its attenuation amplitude by control unit 13a, be convenient to adjust the signal that signal generation device 11 is produced the decay that its simulation is caused in the transmission course of wireless telecommunications space.Usually attenuation amplitude is bigger, represents the distance of signal transmission longer.In addition, control unit 13a also can be coupled to N attenuator 123a (not shown), to control the attenuation amplitude of this N attenuator 123a respectively.
The inside of anechoic chamber 14 then comprises: N antenna 141 is coupled to N the delay line 124 of signal analogue unit 12a respectively, so as to launching N analog signal respectively; And a communication device 142, so as to receiving this N analog signal.Wherein, this N antenna 124 adopts directive property (directional) antenna, as bugle formula antenna (horn antenna), to form an aerial array (antenna array).
In addition, for making analogue system 10a obtain preferable simulate effect, signal generation device 11 adopts a selected sample (Golden Sample) of communication device 142, its characteristic far meets technical standard and the specification that should follow with respect to communication device 142, thereby the signal quality that produces is preferable and conform with testing requirement.In addition, also can use a vectorial signal generator (the vector signal generator) power amplifier of arranging in pairs or groups as required (power amplifier), can produce more accurate, more various signal as required as signal generation device 11.
Please consult Figure 1A again, control unit 13a also is coupled to turntable 144, so as to the anglec of rotation of control turntable 144.Control unit 13a also is coupled to communication device 142, to obtain the signal characteristic that communication device 142 is received.The signal characteristic can comprise herein: signal strength (signal strength), signal quality (signal quality), news frame error rate (Frame Error Rate) and data throughput (Throughput) etc.By control unit 13a, except the generation of may command signal and adjust the attenuation amplitude of signal, also may command turntable 144 to be measuring the antenna diversity effect and the radiation field shape of different azimuth, and obtains the signal characteristic that is received, and carries out follow-up analytical procedure.
Figure 1B is another preferred embodiment calcspar of multi-path analogue system of the present invention.Compare with Figure 1A, the multi-path analogue system 10b of Figure 1B utilizes attenuator 123b, and the function of attenuating device among Figure 1A 121 with attenuator 123a merged.So in signal analogue unit 12b, power divider 122 directly is coupled to signal generation device 11, the signal of its generation is assigned as N sub-signal; N attenuator 123b is coupled to power divider 122, is respectively applied for this N sub-signal of decay, the decay that produces respectively when transmitting in N path with analog signal; 124 in N delay line (delay line) is coupled to N attenuator 123b, is respectively applied for N the sub-signal that delay is decayed through N attenuator 123b, the delay that produces respectively when transmitting in N path with analog signal.Same, in this preferred embodiment, also can omit the delay line 124 in the reference path in this N path.And equal at 2 o'clock at N, and can in reference path, set up a phase shifter, be used for adjusting the phase place of the sub-signal after attenuator 123b decay in the reference path, the phase difference when transmitting in two paths so as to analog signal.
In addition, in Figure 1B, control unit 13b is coupled to N attenuator 123b, so as to adjusting its attenuation amplitude respectively.About other function mode of control unit 13b, then the control unit 13a with Figure 1A is identical.As for the composition and the running of anechoic chamber 14, also identical with Figure 1A.
Then how explanation utilizes aforesaid analogue system 10a, implements multi-path analogy method of the present invention.Fig. 2 is the action flow chart of the preferred embodiment of multi-path analogy method of the present invention.As shown in Figure 2, the method comprises following steps:
21 make signal generation device 11 produce a signal;
22 utilize attenuating device 121 these signals of decay, and produce a decay signal;
23 utilize power divider 122 that this decay signal is assigned as N son decay signal;
24 by N attenuator 123a this N the son decay signal of decaying respectively, so as to simulating the decay that produces respectively when this signal transmits in N path;
25 postpone this N son decay signal respectively by N delay line 124, and produce N analog signal, to simulate the delay that produces respectively when this signal transmits in N path;
26 utilize N antenna 141 to launch this N analog signal respectively; And
27 utilize communication device 142 to receive this N analog signal.
In the step 27, also can adjust the anglec of rotation of turntable 144 by control unit 13a, so as to changing the orientation that communication device 142 receives signal.
In this preferred embodiment, also can in N path, select a reference path, and in step 25, utilize N-1 delay line 124, postpone N-1 the son decay signal (promptly the decay of the son in reference path signal not being postponed) on all the other outer paths of reference path respectively.And, when N equals 2, in step 25 and 26 increase by one steps, utilize the phase shifter in the reference path, for the son decay signal after attenuator 123a decay in the reference path, carry out the phase place adjustment, the phase difference that produces when transmitting in two paths with analog signal.
In another preferred embodiment, then utilize aforesaid analogue system 10b, implement multi-path analogy method of the present invention.Be in step 22 to 25 with the difference of Fig. 2 flow process, wherein step 22 is omitted; In the step 23, utilize power divider 122 that this signal is assigned as N sub-signal; In the step 24, by N attenuator 123b this N sub-signal of decaying respectively; And in the step 25, then postpone this N sub-signal respectively by N delay line 124, to produce N analog signal.
Utilize multi-path analogue system 10a of the present invention and 10b, can carry out the test that various signals receive wireless communication apparatus.Utilization analogue system 10a and 10b below will be discussed, measure the method for the diversity gain of a wireless communication apparatus.Communication device 142 among analogue system 10a and the 10b herein is one to have changeable communication device for single antenna pattern or antenna diversity pattern.Fig. 3 is utilization multi-path analogue system 10a of the present invention, so as to measuring the action flow chart of antenna diversity gain.As shown in Figure 3, this flow process comprises the following step:
31 are set at the single antenna pattern by control unit 13a with communication device 142;
32 make signal generation device 11 produce a test signal;
33 utilize attenuating device 121 with this test signal attenuation first attenuation amplitude;
34 utilize the test signal distribution after signal analogue unit 12a decays this to be adjusted into N analog signal, to simulate decay and the delay that produces respectively when this test signal transmits in N path;
35 utilize N antenna 141 this N of emission analog signal;
36 make communication device 142 receive this N analog signal;
37 measure the signal parameter that communication device 142 is received by control unit 13a, a reference value;
38 switch to the antenna diversity pattern by control unit 13a with communication device 142, and will test signal attenuation second attenuation amplitude, so that the signal parameter that communication device 142 is received equals reference value; And
39 calculate the difference of first and second attenuation amplitude by control unit 13a, are the diversity gain of communication device 142.
Utilize control unit 13a to adjust the anglec of rotation of turntable 144, can change the orientation that communication device 142 receives signals, repeat step 31 to 39, can learn the influence that the reception orientation of communication device 142 causes diversity gain at different orientation.In addition, aforesaid signal parameter can be signal strength, signal quality or data throughput information such as (throughput).
Fig. 4 is utilization multi-path analogue system 10b of the present invention, to measure the action flow chart of antenna diversity gain.In analogue system 10b,, do not influence the calculating of diversity gain though that the method for adjustment of its distribute type is compared with analogue system 10a is different.As shown in Figure 4, this flow process comprises the following step:
41 are set at the single antenna pattern by control unit 13b with communication device 142;
42 make signal generation device 11 produce a test signal;
43 utilize signal analogue unit 12b that this test signal is distributed is adjusted into N analog signal, to simulate decay and the delay that produces respectively when this test signal transmits in N path;
44 utilize N antenna 141 this N of emission analog signal;
45 make communication device 142 receive this N analog signal;
46 measure the signal parameter that communication device 142 is received by control unit 13b, a reference value;
47 switch to the antenna diversity pattern by control unit 13b with communication device 142, and repeating step 42 to 46, so that the signal parameter that communication device 142 is received equals reference value; And
48 by control unit 13b choose N path one of them, and calculate the difference of the analog signal of selected path under single antenna pattern and antenna diversity pattern, be the antenna diversity gain of communication device 142.
Same, can utilize control unit 13b to adjust the anglec of rotation of turntable 144, change the orientation that communication device 142 receives signal, repeat step 41 again to 48, receive the influence of orientation so as to learning to diversity gain.The signal parameter then is information such as signal strength, signal quality or data throughput.
Be understandable that; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1, a kind of multi-path analogue system is characterized in that, comprises at least:
One signal generation device is in order to produce a signal;
One signal analogue unit is coupled to this signal generation device, this signal is distributed be adjusted into N analog signal, and so as to simulating decay and the delay that produces respectively when this signal transmits in N path, wherein N is the integer greater than 1; And
One anechoic chamber, its inside comprise N antenna, are coupled to this signal analogue unit, respectively in order to launch this N analog signal.
2, multi-path analogue system according to claim 1 is characterized in that, this signal analogue unit comprises:
One attenuating device produces a decay signal in order to decay this signal;
One power divider is coupled to this attenuating device, and the signal of should decaying is assigned as N son decay signal;
N attenuator is coupled to this power divider, is respectively applied for this N son decay of decay signal, so as to simulating the decay that produces respectively when this signal transmits in this N path; And
N-1 delay line is coupled to N-1 attenuator in this N attenuator respectively, with N-1 the son decay signal that postpones to be decayed through this N-1 attenuator, so as to simulating the delay that produces respectively when this signal transmits in this N-1 path.
3, multi-path analogue system according to claim 2 is characterized in that, this attenuating device is a step attenuator.
4, multi-path analogue system according to claim 1 is characterized in that, this signal analogue unit comprises:
One power divider is coupled to this signal generation device, and this signal is assigned as N sub-signal;
N attenuator is coupled to this power divider, is respectively applied for this N sub-signal of decay, so as to simulating the decay that produces respectively when this signal transmits in this N path; And
N-1 delay line is coupled to N-1 attenuator in this N attenuator respectively, with N-1 the sub-signal that postpones to be decayed through this N-1 attenuator, so as to simulating the delay that produces respectively when this signal transmits in this N-1 path.
5, multi-path analogue system according to claim 1 is characterized in that, this anechoic chamber inside comprises:
One communication device is in order to receive this N analog signal; And
One turntable so as to carrying this communication device, and changes the orientation of this communication device.
6, multi-path analogue system according to claim 1 is characterized in that, this signal generation device is a vectorial signal generator.
7, a kind of multi-path analogy method is characterized in that, comprises at least:
Produce a signal;
This signal distribution is adjusted into N analog signal, and so as to simulating decay and the delay that produces respectively when this signal transmits in N path, wherein N is the integer greater than 1;
Utilize N antenna to launch this N analog signal respectively, wherein this N antenna is arranged in an anechoic chamber; And
Utilize the communication device in this anechoic chamber to receive this N analog signal.
8, multi-path analogy method according to claim 7 is characterized in that, this signal utilizes a selected sample of a vectorial signal generator or this communication device and produces.
9, multi-path analogy method according to claim 7 is characterized in that, the step of the distribution adjustment of this signal comprises:
Decay this signal and produce a decay signal;
The signal of should decaying is assigned as N son decay signal;
This N the son decay signal of decaying is so as to simulating the decay that produces respectively when this signal transmits in this N path; And
Postpone this N son decay signal, so as to simulating the delay that produces respectively when this signal transmits in this N path.
10, multi-path analogy method according to claim 7 is characterized in that, the step of the distribution adjustment of this signal comprises:
This signal is assigned as N sub-signal;
This N sub-signal of decaying is so as to simulating the decay that produces respectively when this signal transmits in this N path; And
Postpone this N sub-signal, so as to simulating the delay that produces respectively when this signal transmits in this N path.
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| CNA031551483A CN1585308A (en) | 2003-08-20 | 2003-08-20 | Multipath analog system and method |
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| CNA031551483A CN1585308A (en) | 2003-08-20 | 2003-08-20 | Multipath analog system and method |
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| CN102790991A (en) * | 2012-07-23 | 2012-11-21 | 上海同耀通信技术有限公司 | System and method for testing performance of AP in WLAN |
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