CN103929770B - Method of the correction test system wirelessly to be communicated - Google Patents
Method of the correction test system wirelessly to be communicated Download PDFInfo
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- CN103929770B CN103929770B CN201310010208.7A CN201310010208A CN103929770B CN 103929770 B CN103929770 B CN 103929770B CN 201310010208 A CN201310010208 A CN 201310010208A CN 103929770 B CN103929770 B CN 103929770B
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Abstract
The invention discloses a kind of method for correcting test system, received signal strength is referred to including providing one group of reference transmission power and corresponding one group, measure one first group of test received signal strength for corresponding to one first group of test transimission power, one first group of offset is produced with reference to first group of test received signal strength of received signal strength and this according to the group, one first relation is produced according to first group of offset and first group of test received signal strength, measure one second group of test received signal strength for corresponding to one second group of test transimission power, one second group of offset is produced with reference to second group of test received signal strength of received signal strength and this according to the group, and produce one second relation if second group of offset and first relation are mismatched.The signal strength values that test system is measured are corrected by the second relation of present invention generation, no matter test system is transmitted under which kind of transimission power, can be accurately aligned.
Description
Technical field
The present invention is the method on being corrected to test system, and espespecially a kind of signal measured to test system is strong
The method that degree is corrected.
Background technology
In the field of radio communication, received signal strength pointer (received signal strength
Indicator, RSSI) it is a kind of a kind of intensity index value of the watt level of the signal for reflecting and receiving.In radio communication
Can all need to measure RSSI value in many applications, mutual handover strategy (the inter-access point of such as access point
Handover strategies), rate adaptation (rate adaptation) and position sensing (location sensing) etc.
Related application.If in general, the RSSI value that signal is measured is higher, then it represents that this signal is got over to be likely to be and is correctly received
's.Therefore, whether related wireless communications applications many at present are all dependent on the accuracy rate for measuring RSSI value, to judge signal by just
Really receive.
Fig. 1 is refer to, Fig. 1 is that communicator 20,22,24 and 26 is attempted being carried out wirelessly by access point 10 in the prior art
The schematic diagram of communication.In order that communicator 20,22,24 and 26 can each other be communicated by access point 10, communication dress
Put 20,22,24 and 26 must first add distributed by access point 10 set of basic (basic service set,
BSS)。
In the communications applications of Fig. 1, if RSSI value is finished by the correction of communicator 20,22,24 and 26 in advance, RSSI
Relation between value and some contingent variables (dependent variables) can be predicted out so that user can be straight
Connect using communicator 20,22,24 and 26, carried out without the reception signal to communicator 20,22,24 and 26 extra
Treatment, thus enhance convenience and practicality in communication.
Fig. 2 is refer to, Fig. 2 is between the transimission power of prior art wireless communication signals and the RSSI value of reception signal
Graph of relation.In fig. 2, transverse axis represents transimission power, and unit is dBm (dBm), and the longitudinal axis is represented and receives signal
RSSI value.In existing method, the correction program of RSSI value is according to transimission power and the reception letter corresponding to transimission power
Number RSSI value between relation and set up.
As shown in Fig. 2 wireless signal has a variety of transmission work(when being transferred to reference to communicator in x-axis
Rate, and each transimission power all corresponds to the RSSI value on the longitudinal axis.Transimission power on each transverse axis and its corresponding to the longitudinal axis
On RSSI value can determine a data point, whole data points is online, can obtain reference curve 30.
In existing test system correction program, can be by the above-mentioned program of application (i.e. transimission power and corresponding RSSI
Relation between value) and set up a uncorrected test system curve.If exist with reference to communication in the same coordinate system system simultaneously
The reference curve 30 of device and the uncorrected curve of test system, then can be by the inclined of the uncorrected curve to test system
The parameter such as shifting value or slope is adjusted or computing, and produces the song after a correction as similar as possible to reference curve 30
Line, to complete the correction program to test system.
However, the difference of the uncorrected curve based on test system and the reference curve 30 with reference to communicator, to be measured
The uncorrected curve of device is generally difficult to only by deviant and the isoparametric adjustment of slope or computing, so that it may produced and ginseng
The curve after the similar correction of reference curve 30 of communicator is examined, uncorrected curve still may have greatly with reference curve 30
Gap and be difficult to be used.Therefore, for the test system under general communications applications, corresponding to transimission power RSSI value not
Easily by precise calibration.It is so that in the application of radio communication, one kind carries out preferably school to uncorrected test system curve
Correction method should be in the urgent need to.
The content of the invention
One embodiment of the invention is so that the test system carries out radio communication on a kind of one test system of correction
Method.The method includes providing one group of reference transmission power and corresponding to this group the one of reference transmission power group with reference to reception signal
Intensity, measure the test system corresponding to one first group of the one first of test transimission power group of test received signal strength, root
According to the group with reference to first group of test received signal strength generation of received signal strength and this, one first group of offset, by this first group
It is strong signal to be received during offset is stored in a memory of the test system, according to first group of offset and first group of test
Degree produces one first relation, measures being received corresponding to one second group of the one second of test transimission power group of test for the test system
Signal intensity, according to the group with reference to received signal strength and this second group of test received signal strength, one second group of compensation of generation
Simultaneously be stored in second group of offset in the memory by value, and if second group of offset and first relation mismatch, root
Letter is received according to first group of offset, second group of offset, first group of test received signal strength and second group of test
Number intensity produces one second relation.
A further embodiment of the invention is so that the test system carries out radio communication on one kind one test system of correction
Method.The method includes providing one group of reference transmission power and believes with reference to reception corresponding to this group the one of reference transmission power group
Number intensity, measure the test system corresponding to one first group of the one first of test transimission power group of test received signal strength,
One first group of offset is produced with reference to first group of test received signal strength of received signal strength and this according to the group, and by this
Letter is received during one group of offset is stored in a memory of the test system, according to first group of offset and first group of test
Number intensity produce one first relation, measure the test system corresponding to one second group of the one second of test transimission power group of test
Received signal strength, according to the group with reference to received signal strength and this second group of test received signal strength, one second group of benefit of generation
Repay value, and if second group of offset and first relationship match, the test system is corrected according to first relation and is received
Signal intensity.
Brief description of the drawings
Fig. 1 is the schematic diagram that prior art communicator attempts being carried out by access point radio communication.
When Fig. 2 is the transimission power of prior art wireless communication signals and this wireless communication signals is received
The curve map of relation between RSSI value.
Fig. 3 is the schematic diagram of embodiment of the present invention test system.
Fig. 4 is the flow chart that the present invention is corrected program to test system.
Fig. 5 is reference transmission power of the present invention compared to the curve map with reference to received signal strength value.
Fig. 6 is curve map of the first group of RSSI value of the invention compared to transimission power.
Fig. 7 is first group of offset of the invention compared to first group of schematic diagram of received signal strength pointer value.
Fig. 8 is second group of transimission power of the invention compared to second group of curve map of received signal strength pointer value.
Fig. 9 be first group of offset of the invention and second group of offset compared to first group of received signal strength pointer value and
Second group of schematic diagram of the curve of the second relation of received signal strength pointer value.
Wherein, description of reference numerals is as follows：
10 access points
20th, 22,24,26 communicator
30th, 530 reference curve
35 test systems
36 receivers
38 antennas
40 memories
44 processors
36 receivers
37 RSSI modules
44 processors
42 look-up tables
530 reference curves
630 first test curves
730 line segments
830 second test curves
930 curves
402 to 422 steps
Specific embodiment
Some vocabulary have been used in the middle of specification and claim to censure specific component.Have in art logical
Normal skill is, it is to be appreciated that manufacturer may call same component with different nouns.This specification and follow-up Shen
Please the scope of the claims not in the way of the difference of title is used as difference component, but the difference with component functionally is used as
The benchmark of difference.In the whole text specification and follow-up claim mentioned in " including " be an open term, therefore
Should be construed to " including but not limited to ".
Fig. 3 is refer to, Fig. 3 is the schematic diagram of embodiment of the present invention test system 35.As shown in figure 3, test system 35 is wrapped
Include a receiver 36, an antenna 38, a memory 40 and a processor 44.Receiver 36 is to be used to receive nothing by an antenna 38
Line signal, and receiver 36 has a RSSI module 37, is used to measure the RSSI value for receiving signal.Processor 44 is to control
The operation of test system 35.Memory 40 is used to after test system 35 is corrected, and control information is stored in into memory 40
Interior look-up table (lookup table, LUT) 42.Memory 40 can be that electronics can erase and can plan read-only storage
(EEPROM) can also be, non-volatile (non-volatile) memory, such as flash memory, and it is what type of depositing to be not limited to
Reservoir.Look-up table 42 is the control information for storing test system 35 so that control information can be rapidly accessed, thus be avoided
After receiver 36 receives reception signal every time, still need to docking and collect mail number extra step of execution to obtain correct information.
Fig. 4 is refer to, Fig. 4 is that the present invention is corrected the flow chart of program to test system 35, but is not limited to following
The order of the order of step, such as step 408 and step 410 can be exchanged.It is described as follows.
Step 402：One group of reference transmission power is provided and corresponding one group refers to received signal strength；
Step 404：Measure test system 35 receives signal corresponding to first group of the first of test transimission power group of test
Intensity；
Step 406：First group of test that the reference received signal strength provided according to step 402 is provided with step 404 connects
Receive signal intensity and produce one first group of offset, and first group of produced offset is stored in the memory of test system 35
In 40；
Step 408：One first relation is produced according to first group of offset and first group of test received signal strength
(relationship)；
Step 410：Measure being received corresponding to one second group of the one second of test transimission power group of test for test system 35
Signal intensity；
Step 412：Second group of test that the reference received signal strength provided according to step 402 is provided with step 410 connects
Receive signal intensity and produce one second group of offset, and second group of produced offset is stored in memory 40；
Step 414：The second offset produced in step 412 is compared with the first relation of generation in step 408,
If second group of offset is matched with the first relation (substantially), step 420 is carried out；If second group of offset and first
Relation is to mismatch, then carry out step 416；
Step 416：According to first group of offset, second group of offset, first group of test received signal strength and second group
Test received signal strength produces one second relation；
Step 418：The second relation set up according to step 416 corrects the received signal intensity of test system 35, jumps
To step 422；
Step 420：The received signal intensity of test system 35 is corrected according to the first relation；
Step 422：Terminate.
Step 402 is to provide one group of reference transmission power and corresponding one group refers to received signal strength, as shown in figure 5,
Fig. 5 is that one group of reference transmission power of the invention refers to received signal strength pointer (received signal compared to one group
Strength indicator, RSSI) value schematic diagram.Dotted line in Fig. 5 is reference transmission power and corresponding reference connects
The reference curve 530 that signal strength indicator value links formation is received, the unit for being used to represent transimission power is dBm
(dBm)。
In step 404, it is that test system 35 is operated to measure being passed corresponding to one group of test for test system 35
One group of test received signal strength of defeated power, as shown in fig. 6, Fig. 6 is first group of RSSI value of the invention compared to transimission power
Curve map, dotted line is first group of transimission power and corresponding first group of received signal strength pointer value links shape in Fig. 6
Into the first test curve 630, the unit for being used to represent transimission power is also dBm.
In a step 406, can be by first group of received signal strength pointer value and with reference to right in received signal strength pointer value
Should subtract each other to produce first group of offset in two received signal strength pointer values of identical transimission power.For example, first
Group received signal strength pointer value is 17 corresponding to the received signal strength pointer value that transimission power is -95dBm, is believed with reference to receiving
Number strength indicator value is 0 corresponding to the received signal strength pointer value that transimission power is -95dBm, therefore first group of offset
It is 17-0=17 corresponding to the offset that transimission power is -95dBm；First group of received signal strength pointer value corresponds to transmission work(
Rate is that the received signal strength pointer value of -85dBm is 23, with reference to received signal strength pointer value correspond to transimission power for -
The received signal strength pointer value of 85dBm is 11, thus first group of offset corresponding to the compensation that transimission power is -85dBm
Value is 23-11=12；First group of received signal strength pointer value is corresponding to the received signal strength pointer that transimission power is -75dBm
Value is 35, corresponding to the received signal strength pointer value that transimission power is -75dBm is 20 with reference to received signal strength pointer value,
Therefore first group of offset is 35-20=15 corresponding to the offset that transimission power is -75dBm.After in step 408 root again
A straight line that offset trend (tendency) is presented is made in the offset that step 406 is produced according to each, as shown in Figure 7.
Fig. 7 be first group of offset of the invention compared to first group of schematic diagram of received signal strength pointer value, line segment 730 is according to
One group of offset is compared to first group of trend line of received signal strength pointer value.
In a step 408, the first produced relation line segment 730 is presented once (first order) relation or line
Property (linear) relation, the first relation is the rear received signal strength indicator value for correcting test system 35, is then measured
Survey test system 35 corresponding to second group of the second of test transimission power group of test received signal strength when, then by second group of survey
Examination received signal strength is corrected with the first Relationship Comparison in Fig. 7 with to test system.If finding second group of test after correction
Received signal strength exceeds a tolerance interval compared to the gap (deviation) of the first relation, then need to continue follow-up
The step of in produce the second relation test system 35 be corrected.
The dotted line of Fig. 8 is second group of transimission power and corresponding second group of received signal strength pointer value links to be formed
The second test curve 830, the unit for being used to represent transimission power is also dBm.As shown in Fig. 6 and Fig. 8, first group of biography
Defeated power is -95, -85, -75, -65, -55, -45 and -35dBm；Second group of transimission power is -90, -80, -70, -60, -50
And each transimission power of group transimission power of -40dBm, i.e., second be between first group of the two of transimission power adjacent transimission power it
Between.
In step 412, can be by second group of received signal strength pointer value and with reference to right in received signal strength pointer value
Should subtract each other to produce second group of offset in two received signal strength pointer values of identical transimission power.For example, second
Group received signal strength pointer value is 21 corresponding to the received signal strength pointer value that transimission power is -90dBm, is believed with reference to receiving
Number strength indicator value is 5 corresponding to the received signal strength pointer value that transimission power is -90dBm, therefore second group of offset
It is 21-5=16 corresponding to the offset that transimission power is -90dBm；Second group of received signal strength pointer value corresponds to transmission work(
Rate is that the received signal strength pointer value of -80dBm is 27, with reference to received signal strength pointer value correspond to transimission power for -
The received signal strength pointer value of 80dBm is 18, thus second group of offset corresponding to the compensation that transimission power is -80dBm
Value is 27-18=9；Second group of received signal strength pointer value is corresponding to the received signal strength pointer that transimission power is -70dBm
Value is 41, corresponding to the received signal strength pointer value that transimission power is -70dBm is 26 with reference to received signal strength pointer value,
Therefore second group of offset is 41-26=15 corresponding to the offset that transimission power is -70dBm.
In step 414, the second offset for producing is compared with the first relation, if second group of offset and first
Relation (substantially) matches (match), then skip to step 420, and test system 35 is corrected with the first relation.Matching
That is, whether drop is in tolerance interval for the comparative result of second group of offset and the first relation, if second group of offset
It is to mismatch with the first relation, that is, drop is excessive, then step 416 is had to carry out, according to first group of offset, second group of benefit
Repay value, first group of test received signal strength and second group of test received signal strength and produce the second relation, as shown in Figure 9.Fig. 9
It is first group of offset of the invention and second group of offset compared to first group of received signal strength pointer value and second group of reception
The schematic diagram of the curve 930 of the second relation of signal strength indicator value.The second produced relation is the correction in the first relation
As a result in the case that drop exceedes tolerance interval, for correcting the received signal intensity of test system 35.First relation is
Once (first order) relation, as shown in Fig. 7 middle conductors 730, and the second relation can be closed for secondary (second order)
System, but do not limit, can also be once relation or secondary multiple relation above.For example, if test system 35 is received
Received signal strength pointer value be 72, then because according to curve 930, received signal strength pointer value is the compensation corresponding to 72
It is 72-9=63 that value is about the received signal strength pointer value behind 9, therefore correction.
The effect for correcting the received signal intensity of test system 35 by the second relation will be entered better than using the first relation
Row correction.Compared to Fig. 7, Fig. 9 produces the curve 930 that secondary relation is presented by setting more points, and reaches to dress to be measured
35 are put more accurately to correct.In addition, although in the citing more than, the second relation increased more than the first relation and correspond to RSSI
It is worth the multiple measuring points for 21,27,41,51,69,93, but can also only increases less measuring point, for example, only increases correspondence
It is 17,41,93 3 measuring points to RSSI value.
Although the citing in the present embodiment step 404 and 410, first group of test transimission power is transmitted with second group of test
Power is respectively -95, -85, -75, -65, -55, -45 and -35dBm and -90, -80, -70, -60, -50 and -40dBm, so
And, the present invention is not restricted to this, and first group of test transimission power and second group of test transimission power can be any alternate survey
Multiple second group of test are can be inserted between examination transimission power, and first group of the two of test transimission power adjacent test transimission power to pass
The test transimission power of defeated power, such as can be inserted into -92dBm and -88dBm between -95dBm and -85dBm.Also, above-described biography
The size of the decibel difference (interval) of two adjacent transimission powers of defeated power is not intended to limit, but the decibel of two adjacent transimission powers
Difference can be identical.
Bearing calibration of the invention can be applied to a variety of test systems, such as dress to be measured without receiving terminal
Put, or the test system without transmission end, and the present invention is not limited to use for the measurement of received signal strength
RSSI value, it is possible to use other singal reporting codes.Additionally, test system 35 is not limited in being grasped under specific wireless communication network
Make, test system 35 can for example pass through a WLAN (wireless local area network, WLAN) or a line
Mobile phone network is wirelessly communicated.
In sum, the present invention is to receive signal by according to first group of offset, second group of offset, first group of test
Intensity and second group of multiple relation of test received signal strength generation correct the reception letter that test system 35 is measured to promote
Number strength indicator value, therefore the degree of accuracy of received signal strength pointer value that test system 35 is measured can be sufficiently elevated.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (9)
1. it is a kind of to correct a test system so that the test system method that carries out radio communication, it is characterised in that including：
One group of reference transmission power is provided and received signal strength is referred to corresponding to this group the one of reference transmission power group；
Measure the test system corresponding to one first group of the one first of test transimission power group of test received signal strength；
One first group of offset is produced with reference to first group of test received signal strength of received signal strength and this according to the group, and will
First group of offset is stored in a memory of the test system；
One first relation is produced according to first group of offset and first group of test received signal strength；
Measure the test system corresponding to one second group of the one second of test transimission power group of test received signal strength；
One second group of offset is produced with reference to second group of test received signal strength of received signal strength and this according to the group, and will
Second group of offset is stored in the memory；
If second group of offset and first relation are mismatched, according to first group of offset, second group of offset, this
One group of test received signal strength and second group of test received signal strength produce one second relation；And
The test system received signal intensity is corrected according to second relation.
2. the method for claim 1, it is characterised in that it is to produce an once relation to produce first relation.
3. the method for claim 1, it is characterised in that it is to produce once or secondary relation to produce second relation.
4. the method for claim 1, it is characterised in that second group of test transmission of first group of test transimission power and this
Power is alternately to test transimission power.
5. the method for claim 1, it is characterised in that first group of test transimission power and second group of test transmission
Power is two groups of transimission powers that a transmitting device sends a signal to the test system.
6. the method for claim 1, it is characterised in that the group is a group with reference to receiving signal with reference to received signal strength
Strength indicator value, and first group of test received signal strength and second group of test received signal strength are that two groups of tests are received
Signal strength indicator value.
7. the method for claim 1, it is characterised in that this group of the two of reference transmission power adjacent reference transmission power
Decibel difference it is identical, this first group the two of test transimission power it is adjacent test transimission powers decibel differences it is identical, and this second
The decibel difference of two adjacent test transimission powers of group test transimission power is identical.
8. the method for claim 1, it is characterised in that according to the group with reference to received signal strength and first group of test
Received signal strength produces first group of offset, is to receive letter with reference to first group of test of received signal strength and this according to the group
The corresponding difference of number intensity produces first group of offset, is received with reference to second group of test of received signal strength and this according to the group
Signal intensity produces second group of offset, is strong with reference to received signal strength and second group of test reception signal according to the group
The corresponding difference of degree produces second group of offset.
9. it is a kind of to correct a test system so that the test system method that carries out radio communication, it is characterised in that including：
One group of reference transmission power is provided and received signal strength is referred to corresponding to this group the one of reference transmission power group；
Measure the test system corresponding to one first group of the one first of test transimission power group of test received signal strength；
One first group of offset is produced with reference to first group of test received signal strength of received signal strength and this according to the group, and will
First group of offset is stored in a memory of the test system；
One first relation is produced according to first group of offset and first group of test received signal strength；
Measure the test system corresponding to one second group of the one second of test transimission power group of test received signal strength；
One second group of offset is produced with reference to second group of test received signal strength of received signal strength and this according to the group；
If second group of offset and first relationship match, the test system received signal is corrected according to first relation
Intensity；
If second group of offset and first relation are mismatched, according to first group of offset, second group of offset, this
One group of test received signal strength and second group of test received signal strength produce one second relation；And
The test system received signal intensity is corrected according to second relation.
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| TWI664828B (en) * | 2018-02-14 | 2019-07-01 | 和碩聯合科技股份有限公司 | Test method and test system |
| CN111970067B (en) * | 2020-08-26 | 2022-08-12 | 炬芯科技股份有限公司 | Method and device for calibrating output power |
| CN116743279B (en) * | 2023-08-14 | 2023-11-24 | 新唐信通(北京)科技有限公司 | Calibration system and method for wireless communication transmitter |
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|---|---|---|---|---|
| WO2005022178A1 (en) * | 2003-09-03 | 2005-03-10 | Elektrobit Testing Oy | Method and arrangement for rf testing of an electronic device in conjunction with production |
| TW200518513A (en) * | 2003-11-18 | 2005-06-01 | Sanyo Electric Co | Radio communication apparatus suppressing correction error while maintaining communication quality, and method for error correction |
| CN101233654A (en) * | 2005-03-02 | 2008-07-30 | 思科技术公司 | Method and system for self-calibrating transmit power |
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| US8131223B2 (en) * | 2006-04-14 | 2012-03-06 | Litepoint Corporation | System for testing an embedded wireless transceiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022178A1 (en) * | 2003-09-03 | 2005-03-10 | Elektrobit Testing Oy | Method and arrangement for rf testing of an electronic device in conjunction with production |
| TW200518513A (en) * | 2003-11-18 | 2005-06-01 | Sanyo Electric Co | Radio communication apparatus suppressing correction error while maintaining communication quality, and method for error correction |
| CN101233654A (en) * | 2005-03-02 | 2008-07-30 | 思科技术公司 | Method and system for self-calibrating transmit power |
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