CN105657741B - Switched MIMO frame synchronization process method in WIFI comprehensive test instrument - Google Patents
Switched MIMO frame synchronization process method in WIFI comprehensive test instrument Download PDFInfo
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- CN105657741B CN105657741B CN201610091114.0A CN201610091114A CN105657741B CN 105657741 B CN105657741 B CN 105657741B CN 201610091114 A CN201610091114 A CN 201610091114A CN 105657741 B CN105657741 B CN 105657741B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 title abstract description 15
- 238000003672 processing method Methods 0.000 claims description 18
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 108091006146 Channels Proteins 0.000 claims 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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Abstract
The present invention provides a kind of Switched MIMO frame synchronization process methods in WIFI comprehensive test instrument, comprising the following steps: S1, the power for calculating each channel search the power envelope in each channel, to search the rough starting position of each frame；S2, lead data (the 16us data frame) are taken out since rough frame starting position, carries out sliding related operation with the lead data in local standard L-LTF and each channel；S3, the accurate starting position by correlation peak judgment frame；S4, sliding delay correlation (taking the data of 6.4us length every time, it is related to do sliding delay with preceding 3.2us to rear 3.2us) is done to the lead data in each channel, and search the relevant summit of delay.Judge the beneficial effects of the present invention are: the locally associated starting position as frame is utilized, and related as circulation road judgement using delay, is determined when circulation road judges by each stream CSD value difference.
Description
Technical Field
The invention relates to a frame synchronization processing method, in particular to a Switched MIMO frame synchronization processing method in a WIFI integrated tester.
Background
The existing WIFI equipment sending verification scheme mainly comprises True MIMO, Composite MIMO and Switched MIMO schemes, and test scenes and test requirements of the schemes are different, so that the schemes have different advantages and disadvantages; the True MIMO scheme can measure all MIMO performance indexes, is a real MIMO application scene test, simultaneously acquires and analyzes data of each antenna, but needs a plurality of sets of VSA units to simultaneously cooperate, so the test cost is high; composite MIMO is a method for introducing mixed multi-channel signals into a test instrument, only one set of VSA unit is needed, each antenna is collected and analyzed after being mixed by a power divider, and known sending data is needed; the Switched MIMO is a compromise MIMO testing method, and has the advantages that only one set of VSA unit is needed, the switch is used for switching to different links in a time-sharing mode to collect data of each antenna for analysis, but the Switched MIMO can be tested only when specific testing conditions (such as the modulation mode and PSDU data cannot be changed and the channel is constant in a single testing process) are met. When a factory production test is carried out, a low-cost WIFI test method is needed, due to the fact that the test environment of the Switched MIMO is not complex, the test can be completed only by one set of VSA, and the Switched MIMO is a low-cost reliable test scheme.
During Switched MIMO testing, the switch is used for switching to different links in a time-sharing manner to acquire data; since data frames cannot be synchronized when data of each link is acquired at different time, analyzing Switched MIMO time frame synchronization is one of the difficulties, and the frame synchronization includes frame starting point alignment and stream sequence number judgment.
Interpretation of terms:
WIFI: a wireless local area network.
MIMO: a multiple input multiple output communication system.
True MIMO: a real MIMO communication system.
Composite MIMO: a hybrid multiple-input multiple-output communication system.
Switched MIMO: switching a MIMO communication system.
CSD: cyclic shift diversity.
And (3) VSA: and (5) analyzing a vector signal.
L-LTF: a non-high rate long training sequence.
PSDU: the physical layer services data unit.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a Switched MIMO frame synchronization processing method of a WIFI comprehensive tester, which is an accurate synchronization technology under Switched MIMO and realizes MIMO analysis in a time-sharing sampling system.
The invention provides a SWITCHED MIMO frame synchronization processing method in a WIFI integrated tester, which comprises the following steps:
s1, calculating the power of each channel, and searching the power envelope of each channel so as to search the rough starting position of each frame;
s2, extracting the leading data (16 us data of the frame start) from the rough frame start position, and using the local standard L-LTF and the leading data of each channel to carry out sliding correlation operation;
s3, judging the accurate starting position of the frame through the correlation peak value;
s4, performing sliding delay correlation on the leading data of each channel (taking data with the length of 6.4us every time, and performing sliding delay correlation by using the front 3.2us and the rear 3.2 us), and searching for a peak meeting of the delay correlation;
s5, making difference between the position found by the local correlation and the peak position found by the front correlation and the rear correlation, and sequencing the difference result of each channel from small to large, thereby determining the difference result as the channel serial number.
As a further improvement of the present invention, in step S1, the power envelope of each channel is searched by a moving average method, and a rough position judgment of the frame is realized.
As a further improvement of the present invention, in step S5, two different positions are found out by two different correlation methods, so as to implement Switched MIMO frame synchronization; the accurate frame starting position can be judged by utilizing local correlation, and the accurate alignment of the data acquired by different antennas in a time-sharing manner is realized; the stream sequence number can be judged by adopting a pre-and-post correlation algorithm and utilizing the CSD parameter characteristics in the standard.
As a further improvement of the present invention, in step S2, the formula is usedPerforming correlation operation on the local standard L-LTF and the leading data sampled by each channel, wherein LiTime domain data for local standard L-LTF, riTo receive a signal, y is the correlation result.
As a further improvement of the present invention, in step S4, the formula of the front-back correlation operation isWherein r isiTo receive a signal, x is the correlation result.
The invention has the beneficial effects that: providing an accurate synchronization technology under Switched MIMO, and realizing MIMO analysis in a time-sharing sampling system; the local correlation is used as the starting position judgment of the frame, the delay correlation is used as the flow channel judgment, and the CSD value of each flow is different during the flow channel judgment.
Drawings
Fig. 1 is a schematic flowchart of a SWITCHED MIMO frame synchronization processing method in a WIFI comprehensive tester according to the present invention.
Fig. 2 is a schematic diagram of step S1 in the SWITCHED MIMO frame synchronization processing method in the WIFI comprehensive tester of the present invention.
Fig. 3 is a schematic diagram of step S2 in the SWITCHED MIMO frame synchronization processing method in the WIFI comprehensive tester of the present invention.
Fig. 4 is a schematic diagram of step S3 in the SWITCHED MIMO frame synchronization processing method in the WIFI comprehensive tester of the present invention.
Fig. 5 is a schematic diagram of step S4 in the SWITCHED MIMO frame synchronization processing method in the WIFI comprehensive tester of the present invention.
Fig. 6 is a schematic diagram of step S4 in the SWITCHED MIMO frame synchronization processing method in the WIFI comprehensive tester of the present invention.
Fig. 7 is a schematic diagram of step S5 in the SWITCHED MIMO frame synchronization processing method in the WIFI comprehensive tester of the present invention.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1, a SWITCHED MIMO frame synchronization processing method in a WIFI comprehensive tester utilizes local correlation as a start position judgment of a frame, and utilizes delay correlation as a stream channel judgment, and determines by different CSD values of each stream when a stream channel judgment is made.
(1) The power of each channel is calculated first, and then the power envelope is found by the moving average method, so as to find the rough starting position of each frame, as shown in fig. 2.
(2) The local standard L-LTF is correlated with the leading data of each channel sample. According to the standard data frame structure, the L-LTF transmits known data and the data is two 4us repetitions, as shown in fig. 3.
The formula is as follows:
wherein liTime domain data for local L-LTF, riTo receive a signal, y is the correlation result.
(3) The start position of the frame is judged by the correlation peak. The following graph is correlated, and it can be seen that two peaks exist with the correlation result of the local ideal L-LTF, and by detecting the peak positions, the start positions of the frames of the respective channels can be determined, as shown in fig. 4.
(4) Each channel was individually delay correlated with 3.2us of L-LTF. Correlation results as shown in FIGS. 5 and 6, a peak is reached when the positions of the two L-LTFs overlap completely.
The formula is as follows:
wherein r isiTo receive a signal, x is the correlation result.
(5) And (4) making a difference value between the position found by the local correlation and the positions of peak values found by the front correlation and the rear correlation, and sequencing the difference value results of all channels from small to large so as to determine the difference value results as the channel serial number. In the ieee802.11n and ieee802.11ac standards, there are different CSD times for the respective channels during MIMO modulation, and this time is reflected in the time domain data as a positional difference, so that the spatial stream number can be determined by judging the relative difference in position, as shown in fig. 7.
The Switched MIMO frame synchronization processing method of the WIFI integrated tester provided by the invention has the following advantages:
1. the frame service modules are standardized so that different service modules can be flexibly configured.
2. The MIMO analysis is realized and the measurement cost is saved under the condition that only one set of acquisition unit is used, the data of each antenna is acquired in a time-sharing mode by using the selector switch and the frame positions of the sampled data are seriously misaligned.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (4)
1. A Switched MIMO frame synchronization processing method in a WIFI integrated tester is characterized by comprising the following steps:
s1, calculating the power of each channel, and searching the power envelope of each channel so as to search the rough starting position of each frame;
s2, taking out the leading data from the rough frame start position, and using the local standard L-LTF and the leading data of each channel to perform sliding correlation operation;
s3, judging the accurate starting position of the frame through the correlation peak value;
s4, performing sliding delay correlation on the leading data of each channel, searching a peak meeting of the delay correlation, and reaching the peak meeting when the positions of two L-LTFs are completely overlapped;
s5, making difference between the position found by the local correlation and the peak position found by the front correlation and the rear correlation, and sequencing the difference result of each channel from small to large, thereby determining the channel sequence number to realize frame synchronization;
wherein,
in step S2, the formula is usedPerforming correlation operation on the local standard L-LTF and the leading data sampled by each channel, wherein LiTime domain data for local standard L-LTF, riTo receive a signal, y is the correlation result.
2. The Switched MIMO frame synchronization processing method in a WIFI integrated tester as claimed in claim 1, wherein: in step S1, the power envelope of each channel is found by the moving average method.
3. The Switched MIMO frame synchronization processing method in a WIFI integrated tester as claimed in claim 1, wherein: in step S2, the local standard L-LTF transmits known data and the data is repeated for two 4 us.
4. The Switched MIMO frame synchronization processing method in a WIFI integrated tester as claimed in claim 1, wherein: in step S4, the slide delay correlation operation is formulated asWherein r isiTo receive a signal, x is the correlation result.
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| CN101312454A (en) * | 2007-05-23 | 2008-11-26 | 中兴通讯股份有限公司 | MIMO-OFDM synchronization method and apparatus |
| CN103200144A (en) * | 2013-03-28 | 2013-07-10 | 灵芯微电子科技（苏州）有限公司 | Synchronizing method used for MIMO-OFDM system |
| CN103944850A (en) * | 2014-03-27 | 2014-07-23 | 西安星河亮点信息技术有限公司 | WLAN system frame synchronization method based on OFDM technology |
| CN104618299A (en) * | 2015-02-15 | 2015-05-13 | 东南大学 | Channel estimation method for IEEE 802.11ac radio frequency conformance testing |
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| US7706458B2 (en) * | 2001-04-24 | 2010-04-27 | Mody Apurva N | Time and frequency synchronization in Multi-Input, Multi-Output (MIMO) systems |
| KR101103136B1 (en) * | 2009-04-08 | 2012-01-04 | 주식회사 세아네트웍스 | Device and method for changing MIO mode in wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101312454A (en) * | 2007-05-23 | 2008-11-26 | 中兴通讯股份有限公司 | MIMO-OFDM synchronization method and apparatus |
| CN103200144A (en) * | 2013-03-28 | 2013-07-10 | 灵芯微电子科技（苏州）有限公司 | Synchronizing method used for MIMO-OFDM system |
| CN103944850A (en) * | 2014-03-27 | 2014-07-23 | 西安星河亮点信息技术有限公司 | WLAN system frame synchronization method based on OFDM technology |
| CN104618299A (en) * | 2015-02-15 | 2015-05-13 | 东南大学 | Channel estimation method for IEEE 802.11ac radio frequency conformance testing |
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Address after: 518000 5C, 1, building No. 6, Ting Wei Road, 67 District, Xingdong community, Baoan District Xin'an, Shenzhen, Guangdong. Applicant after: SHENZHEN JIZHI HUIYI TECHNOLOGY CO., LTD. Address before: 518000 Building 2, Zone 2, Block 2, Honghualing Industrial South Zone, 1213 Liuxian Avenue, Taoyuan Street, Nanshan District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN JIZHI HUIYI TECHNOLOGY CO., LTD. |
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