CN105656829B - Processing method, access point and the terminal of Beacon frame - Google Patents
Processing method, access point and the terminal of Beacon frame Download PDFInfo
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- CN105656829B CN105656829B CN201410681896.4A CN201410681896A CN105656829B CN 105656829 B CN105656829 B CN 105656829B CN 201410681896 A CN201410681896 A CN 201410681896A CN 105656829 B CN105656829 B CN 105656829B
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Abstract
The invention discloses a kind of processing methods of Beacon frame, this method comprises: AP receives the Beacon frame by OFDM modulation, and the Beacon frame of OFDM modulation is repeatedly sent by mutiple antennas, and send the Beacon frame of OFDM modulation by one in mutiple antennas every time.Invention additionally discloses a kind of access point and terminals.By the above-mentioned means, the present invention can be improved the accuracy and stability of positioning system.
Description
Technical field
The present invention relates to wireless communication field, more particularly to the processing method of Beacon frame a kind of, access point (English:
Access point, abbreviation: AP) and terminal.
Background technique
Common indoor positioning is used based on WLAN (English: wireless local area network, contracting
Write: WLAN) localization method of technology.
As shown in Figure 1, Fig. 1 is the structural schematic diagram of traditional positioning system based on WLAN technology, the number of the AP in Fig. 1
Amount is at least two, wherein illustrates the positioning system in Fig. 1 by taking 3 AP as an example, which includes: location-server 10, more
A AP, such as: AP11, AP12, AP13 and terminal 14.Terminal 14 is in the signal cover of AP11, AP12, AP13.Terminal
14 receive the Beacon frame that AP11, AP12, AP13 are sent, and the Beacon frame of each AP is calculated according to the Beacon frame received
Received signal strength indicator (English: receive signal strength indicator, abbreviation: RSSI), while will be each
The RSSI of the Beacon frame of a AP is sent to location-server 10, so that Beacon frame of the location-server 10 according to each AP
RSSI positioning terminal 14 specific location.
By taking AP11 as an example, as shown in Fig. 2, Fig. 2 is the structural schematic diagram of AP traditional in Fig. 1, AP11 includes that data generate
Module 111, coding module 112, planisphere mapping (English: constellation diagram) module 113, orthogonal frequency division multiplexing
With (English: orthogonal frequency-division multiplexing, abbreviation: OFDM) modulation module 114, circulation
Delay diversity (English: Cyclic Delay Diversity, abbreviation: CDD) module 115, digital-to-analogue modulation module 116, amplification mould
Block 117, Anneta module 118.Wherein, CDD module 115 includes the first CDD unit 1151 and the 2nd CDD unit 1152；Digital-to-analogue tune
Molding block 116 includes the first digital-to-analogue modulation unit 1161, the second digital-to-analogue modulation unit 1162 and third digital-to-analogue modulation unit 1163；
Amplification module 117 includes the first amplifying unit 1171, the second amplifying unit 1172 and third amplifying unit 1173；Anneta module
118 include first antenna 1181, the second antenna 1182 and third antenna 1183.Data generation module 111 is to be sent for generating
Beacon frame.Coding module 112 to sent Beacon frame for being encoded.Planisphere mapping block 113 is used for will
Planisphere mapping is carried out by the Beacon frame of coding.Beacon of the OFDM modulation module 114 for will be mapped by planisphere
Frame carries out OFDM modulation.
Since Anneta module 118 includes first antenna 1181, the second antenna 1182 and third antenna 1183, OFDM modulates mould
Block 114 will be copied into three parts by the Beacon frame of OFDM modulation, to pass through first antenna 1181, the second antenna 1182 and third
Antenna 1183 sends the Beacon frame of three parts of duplications respectively.
Wherein, the first digital-to-analogue modulation unit 1161 is used to the Beacon frame that first part is replicated being converted to the first analog signal
Beacon frame, and the first analog signal Beacon frame is subjected to first carrier modulation.First amplifying unit 1171 will be for that will pass through
The Beacon frame of first carrier modulation is amplified to obtain the first amplified signal Beacon frame.First antenna 1181 is used for the
One amplified signal Beacon frame is sent.
First CDD unit 1151 is used to be delayed according to the Beacon frame that the first delay value replicates second part.Second
Digital-to-analogue modulation unit 1162 is used to be converted to the Beacon frame of delay the second analog signal Beacon frame, and the second simulation is believed
Number Beacon frame carries out the second carrier modulation.Second amplifying unit 1172 be used for by the Beacon frame Jing Guo the second carrier modulation into
Row amplification is to obtain the second amplified signal Beacon frame.Second antenna 1182 is used to send the second amplified signal Beacon frame.
2nd CDD unit 1152 is for being delayed to the Beacon frame that third part is replicated according to the second delay value.Third
Digital-to-analogue modulation unit 1163 is used to be converted to the Beacon frame of delay third analog signal Beacon frame, and third is simulated and is believed
Number Beacon frame carries out third carrier modulation.Third amplifying unit 1173 be used for by the Beacon frame Jing Guo third carrier modulation into
Row amplification is to obtain third amplified signal Beacon frame.Third antenna 1183 is used to send third amplified signal Beacon frame.
As shown in figure 3, the structural schematic diagram of terminal traditional in Fig. 1, AP11 transmission Beacon frame is primary, and terminal 14 just connects
It is primary to receive AP11 transmission Beacon frame.Wherein, terminal 14 includes Anneta module 141, low noise amplifier (English: low-noise
Amplifier) module 142, demodulation modulus module 143, OFDM demodulation module 144, single RSSI computing module 145 and Alpha
Filter (English: alpha beta filter) module 146.
Anneta module 141 is used to receive the Beacon frame of AP11 transmission.Low noise amplifier module 142 is used to send out AP11
The Beacon frame sent carries out low noise amplification.Modulus module 143 is demodulated for that will carry out by the Beacon frame of low noise amplification
Carrier wave demodulation, and digital signal Beacon frame will be converted to by the Beacon frame of carrier wave demodulation.OFDM demodulation module 144 is used for
Digital signal Beacon frame is subjected to OFDM demodulation.Single RSSI computing module 145 is used for the Beacon Jing Guo OFDM demodulation
Frame is calculated to obtain the RSSI of the Beacon frame of OFDM demodulation.Alpha's filter module 146 is to multiple Beacon frames
RSSI carries out Alpha's filtering, and will be sent to Anneta module 141 by the RSSI of Alpha's filtering, to pass through Anneta module
RSSI is reported location-server 10 by 141, so that signal of the location-server 10 by RSSI positioning terminal 14 in AP11 covers
Specific location within the scope of lid.
In AP11, the first CDD module 1151 and the 2nd CDD module 1152 are delayed to generate phase to Beacon frame
Delay, so as to multidiameter delay further occur.But after phase change, when Beacon frame corresponds in frequency domain from time domain
Will the frequency of occurrences fluctuation so that terminal 14 calculate Beacon frame RSSI it is inaccurate, to be unfavorable for location-server 10
The accuracy and stability of positioning.
Summary of the invention
The present invention provides processing method, access point and the terminal of a kind of Beacon frame, can be improved wireless location system
Accuracy and stability.
First aspect present invention provides a kind of processing method of Beacon frame, which includes: that AP receives process
The Beacon frame of OFDM modulation, and the Beacon frame that OFDM is modulated repeatedly is sent by mutiple antennas, and pass through multiple days every time
One in line sends the Beacon frame of OFDM modulation.
With reference to first aspect, in the first possible embodiment of first aspect, the processing method further include: AP connects
The operating mode instruction that location-server is sent is received, and the operating mode of AP is switched to Beacon frame sending mode, wherein fixed
Position server, which detects, sends operating mode instruction to AP when having terminal in the signal cover of AP.
The possible implementation of with reference to first aspect the first, in second of possible embodiment of first aspect,
AP receives first time value T, AP from location-server and repeatedly sends Beacon frame by mutiple antennas using T as the period, wherein the
One time value T is the maximum value in the second time value T1 and third time value T2, and the second time value T1 generates to be sent for AP
The period of Beacon frame, third time value T2 are the period that terminal updates RSSI.
The possible implementation of with reference to first aspect the first, in the third possible embodiment of first aspect,
AP receives first time value T, AP from location-server and repeatedly sends Beacon frame by mutiple antennas using T as the period, wherein the
One time value T is the second time value T1 that AP generates Beacon frame to be sent.
Second aspect of the present invention provides a kind of access point AP, which includes: including antenna switch module and antenna mould
Block: antenna switch module is used to receive after the Beacon frame that OFDM is modulated, and the Beacon of OFDM modulation is sent
One into the mutiple antennas of Anneta module；Anneta module passes through every time for repeatedly sending the Beacon of OFDM modulation
One in the mutiple antennas of Anneta module sends the Beacon frame of OFDM modulation, and plurality of antenna is at least two antenna.
In conjunction with second aspect, in the first possible embodiment of second aspect, AP further includes operating mode switching
The operating mode of AP for receiving the operating mode instruction of location-server transmission, and is switched to Beacon frame and sent by module
Mode, wherein location-server, which detects, sends operating mode instruction to AP when having terminal in the signal cover of AP.
In conjunction with the first implementation of second aspect, in second of possible embodiment of second aspect, antenna
Module is also used to receive value T at the first time from location-server, and Anneta module is repeatedly sent using T as the period by mutiple antennas
Beacon frame, wherein value T is the maximum value in the second time value T1 and third time value T2, the second time value T1 at the first time
The period of Beacon frame to be sent is generated for AP, third time value T2 is the period that terminal updates RSSI.
In conjunction with the first implementation of second aspect, in the third possible embodiment of second aspect, antenna
Module is also used to receive value T at the first time from location-server, and Anneta module is repeatedly sent using T as the period by mutiple antennas
Beacon frame, wherein value T is the second time value T1 that AP generates Beacon frame to be sent at the first time.
Third aspect present invention provides a kind of processing method of Beacon frame, which includes: that terminal obtains process
The Beacon frame of OFDM demodulation, and the Beacon frame of OFDM demodulation is calculated to obtain the Beacon frame of OFDM demodulation
RSSI；Terminal stores RSSI, while judging whether the number of RSSI is equal to N, and when the number for determining RSSI is equal to N, to N number of
RSSI carries out arithmetic average processing, to obtain RSSI arithmetic mean of instantaneous value corresponding with N number of RSSI, wherein terminal obtains RSSI and calculates
The number of the RSSI of terminal storage is zeroed out after art average value and is stored again, wherein N is just whole more than or equal to 2
Number；RSSI arithmetic mean of instantaneous value is reported to location-server by terminal, so that location-server is fixed by RSSI arithmetic mean of instantaneous value
The position of position terminal.
In conjunction with the third aspect, in the first possible embodiment of the third aspect, processing method further include: terminal obtains
The BSSID for the Beacon frame for taking AP to send, and the BSSID of the AP Beacon frame sent is reported into location-server, so that fixed
Position server judges terminal whether in the signal cover of AP by BSSID, after wherein location-server receives BSSID,
The BSSID saved in BSSID and the database of location-server is matched, and in the data of BSSID and location-server
Judge terminal in the signal cover of AP when the BSSID matching saved in library.
Fourth aspect present invention provides a kind of terminal comprising: single RSSI computing module, for obtaining by OFDM
After the Beacon frame of demodulation, the Beacon frame of OFDM demodulation is calculated to obtain the RSSI of the Beacon frame of OFDM demodulation；
Arithmetic average computing module for storing RSSI, while judging whether the number of RSSI is equal to N, and in the number for determining RSSI
When equal to N, arithmetic average processing is carried out to N number of RSSI, to obtain RSSI arithmetic mean of instantaneous value corresponding with N number of RSSI, wherein eventually
End is zeroed out the number of the RSSI of terminal storage and stores again after obtaining RSSI arithmetic mean of instantaneous value, wherein N be greater than or
Positive integer equal to 2；Anneta module, for RSSI arithmetic mean of instantaneous value to be reported to location-server, so that location-server
Pass through the position of RSSI arithmetic mean of instantaneous value positioning terminal.
In conjunction with fourth aspect, in the first possible embodiment of fourth aspect, Anneta module is also used to obtain AP
The BSSID of the Beacon frame of transmission, and the BSSID of the AP Beacon frame sent is reported into location-server, so that positioning clothes
Business device judges terminal whether in the signal cover of AP by BSSID, will after wherein location-server receives BSSID
The BSSID saved in BSSID and the database of location-server is matched, and in the database of BSSID and location-server
Judge terminal in the signal cover of AP when the BSSID matching of middle preservation.
In above scheme, AP of the invention receives the Beacon frame by OFDM modulation, and is repeatedly sent out by mutiple antennas
The Beacon frame for sending OFDM to modulate, and the Beacon frame of OFDM modulation, above-mentioned step are sent by one in mutiple antennas every time
Suddenly by software realization, the step of CDD technology is delayed to Beacon frame can be reduced, Beacon frame is avoided to go out because of phase delay
The wave phenomenon of existing frequency effectively improves the accuracy that terminal receives Beacon frame, to be conducive to the essence of location-server positioning
Exactness and stability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of traditional positioning system based on WLAN technology；
Fig. 2 is the structural schematic diagram of AP traditional in Fig. 1；
Fig. 3 is the structural schematic diagram of terminal traditional in Fig. 1；
Fig. 4 is the flow diagram of the processing method of the Beacon frame of positioning system of the present invention in Fig. 1；
Fig. 5 is the structural schematic diagram of the first embodiment of AP11 of the present invention in Fig. 1；
Fig. 6 is the structural schematic diagram of the first embodiment of terminal of the present invention in Fig. 1；
Fig. 7 is the structural schematic diagram of the second embodiment of AP11 of the present invention in Fig. 1；
Fig. 8 is the structural schematic diagram of the second embodiment of terminal of the present invention in Fig. 1；
Fig. 9 is the structural schematic diagram of the 3rd embodiment of AP11 of the present invention in Fig. 1；
Figure 10 is the structural schematic diagram of the 3rd embodiment of terminal of the present invention in Fig. 1.
Specific embodiment
The embodiment of the present invention is described in detail with embodiment with reference to the accompanying drawing.
As shown in figure 4, Fig. 4 is the flow diagram of the processing method of the Beacon frame of positioning system of the present invention in Fig. 1, figure
Positioning system in 4 is improved based on the positioning system in Fig. 1.The positioning system include location-server 10,
AP11,12,13 and terminal 14.Wherein AP11,12,13 are connect with interchanger, alternatively, AP11,12,13 do not limit with
Interchanger connection can also be connect with wireless controller (English: wireless controller).
By taking AP11 as an example and the quantity of the antenna of AP11 is 3 positioning systems illustrated in the embodiment of the present invention, it should be appreciated that
The quantity of the antenna of AP11 is at least two.Wherein, the processing method the following steps are included:
Step S101:AP11 generates Beacon frame to be sent.
Optionally, before executing step S101, AP11 receives the operating mode instruction that location-server 10 is sent, AP11
It receives and operating mode is switched to Beacon frame sending mode after operating mode instruction.In embodiments of the present invention, positioning clothes
Business device 10, which detects, sends operating mode instruction to AP11 when having terminal 14 in the signal cover of AP11.Wherein terminal 14
Obtain the basic service set identifier (English: basic service set identifier, contracting for the Beacon frame that AP11 is sent
Write: BSSID), and BSSID is reported into location-server 10.Location-server 10 can be judged by BSSID terminal 14 whether
In the signal cover of AP11.Wherein, after location-server 10 receives BSSID, location-server 10 is by BSSID and positions
The BSSID saved in the database of server 10 is matched, and saved in the database of BSSID and location-server 10
BSSID judges terminal 14 in the signal cover of AP11 when matching.
Regardless of whether the operating mode of AP11 is in Beacon frame sending mode, AP11 can generate Beacon to be sent
Frame.But when the operating mode of AP11 is not under Beacon frame sending mode, Beacon frame to be sent transmitted by AP11
Mode is unfavorable for the accuracy that terminal 14 calculates RSSI.In order to improve the accuracy that terminal 14 calculates RSSI, AP11 is in Beacon
Under frame sending mode mode, AP11 generates Beacon frame to be sent as the period using the second time value T1, and wherein this is to be sent
Beacon frame, which needs not move through CDD technical treatment, can be transmitted directly to terminal 14.
Step S102:AP11 is encoded to sent Beacon frame.
Step S103:AP11 will carry out planisphere mapping by the Beacon frame of coding.
Step S104:AP11 will carry out OFDM modulation by the Beacon frame of planisphere mapping.
Step S105:AP11 receives the Beacon frame by OFDM modulation, and repeatedly sends OFDM tune by mutiple antennas
The Beacon frame of system, and the Beacon frame of OFDM modulation is sent by one in mutiple antennas every time.
In step s105, antenna and the M+1 times transmission OFDM used in the Beacon frame of the M times transmission OFDM modulation
Antenna used in the Beacon frame of modulation is different, and wherein M is the positive integer more than or equal to 2.
Specifically, each antenna is equipped with number, AP11, which is sent according to the number order of antenna by antenna, passes through OFDM
Modulated Beacon frame.If AP11 generates first part after the modulated Beacon frame of OFDM, pass through OFDM for first part
Modulated Beacon frame is sent on the antenna equipped with the first number to send first part by the antenna for being equipped with the first number
By the modulated Beacon frame of OFDM.AP11 generates second part after the modulated Beacon frame of OFDM, and second part is passed through
The modulated Beacon frame of OFDM is crossed to be sent on the antenna equipped with the second number to send by the antenna for being equipped with the second number
Second part is passed through the modulated Beacon frame of OFDM.AP11 generates third part after the modulated Beacon frame of OFDM, by the
Three parts are sent on the antenna equipped with third number by the modulated Beacon frame of OFDM through the day for being equipped with third number
Line sends third part and passes through the modulated Beacon frame of OFDM.Optionally, AP11 can not pass through according to the number order of antenna
Antenna, which is sent, passes through the modulated Beacon frame of OFDM.
Alternatively, AP11 is received after the Beacon frame that OFDM is modulated, and sends the OFDM Beacon frame modulated to
One in multiple digital analog converters；AP11 is turned the modulated Beacon frame of OFDM by one in multiple digital analog converters
It is changed to analog signal Beacon frame, and analog signal Beacon frame is subjected to carrier modulation；AP11 will be through by power amplifier
The Beacon frame for crossing carrier modulation is amplified to obtain amplified signal Beacon frame；AP11 repeatedly sends amplification letter by antenna
Number Beacon frame.
In embodiments of the present invention, AP11 receives value T, AP11 at the first time from location-server 10 and passes through by the period of T
Mutiple antennas repeatedly sends Beacon frame.Wherein value T is the maximum in the second time value T1 and third time value T2 at the first time
Value, i.e. location-server 10 receive the second time value T1 and third time value T2, and by the second time value T1 and third time value
Maximum value in T2 is sent to AP11 as value T at the first time.Second time value T1 is that AP11 generates Beacon frame to be sent
Period, third time value T2 be terminal 14 update RSSI period, i.e. third time value T2 be location-server 10 position end
The period of the specific location at end 14.
Alternatively, cycle T may be T1.That is AP11 receives value T at the first time from location-server 10, and AP11 is with T
Pass through a transmission Beacon frame in mutiple antennas for the period.Wherein, first time value T is generated to be sent for AP11
Second time value T1 of Beacon frame.
Step S106: terminal 14 receives the Beacon frame that AP11 is sent by antenna.
Step S107: terminal 14 carries out low noise amplification to the Beacon frame that AP11 is sent.
Step S108: terminal 14 will carry out carrier wave demodulation by the Beacon frame of low noise amplification, and by carrier wave demodulation
Beacon frame is converted to digital signal Beacon frame.
Step S109: digital signal Beacon frame is carried out OFDM demodulation by terminal 14.
Step S110: terminal 14 receives the Beacon frame after OFDM demodulation, and carries out to the Beacon frame after demodulation
It calculates to obtain the RSSI of Beacon frame.
Step S111: terminal 14 stores the RSSI of Beacon frame, while judging whether the number of RSSI is equal to N, and true
When determining the number of RSSI equal to N, arithmetic average processing is carried out to N number of RSSI, it is flat to obtain RSSI arithmetic corresponding with N number of RSSI
Mean value.Wherein, N is the positive integer more than or equal to 2.
In step S111, terminal 14 judges that the number for being stored in the RSSI that same AP sends Beacon frame in terminal 14 is
No to be equal to N, i.e. terminal 14 judges whether the number of the RSSI of the AP11 being stored in terminal 14 transmission Beacon frame is equal to N.Eventually
End 14 sends AP11 when determining that the AP11 being stored in terminal 14 sends the number of the RSSI of Beacon frame equal to N
N number of RSSI of Beacon frame carries out arithmetic average processing, to obtain RSSI corresponding with AP11 transmission N number of RSSI of Beacon frame
Arithmetic mean of instantaneous value.
For example, when such as N is 3, terminal 14 receives the RSSI that the 1st AP11 sends Beacon frame in the 1st cycle T
When, terminal 14 stores the 1st RSSI, while terminal 14 judges whether the number of RSSI is equal to N, and the number of RSSI is 1 small this moment
In N, then terminal 14 continues to store the 2nd RSSI；Terminal 14 receives the 2nd AP11 in the 2nd cycle T and sends Beacon frame
When RSSI, terminal 14 stores the 2nd RSSI, while terminal 14 judges whether the number of RSSI is equal to N, and the number of RSSI is this moment
2 are less than N, then terminal 14 continues to store the 3rd RSSI.Terminal 14 receives the 3rd AP11 in the 3rd cycle T and sends Beacon frame
RSSI when, terminal 14 stores the 3rd RSSI, while terminal 14 judges whether the number of RSSI is equal to N, this moment the number of RSSI
It is equal to N for 3, then terminal 14 carries out arithmetic average processing to 3 AP11 RSSI for sending Beacon frame to obtain 3 AP11 transmissions
The corresponding RSSI arithmetic mean of instantaneous value of the RSSI of Beacon frame.That is, terminal 14 sends N number of AP11 using T2 as period distances
The RSSI of Beacon frame carries out arithmetic average processing to obtain RSSI arithmetic corresponding with N number of AP11 transmission RSSI of Beacon frame
Average value.Wherein T2=N × T, T are the period that AP11 sends Beacon frame by antenna.The cycle T 2 of the update of terminal 14 RSSI
N times of the cycle T of Beacon frame is sent by antenna for AP11, N can be any positive integer more than or equal to 2, can keep away
Exempt from 14 frequent updating RSSI of terminal and power consumption is caused to increase.Such as in the case where N is 3, terminal 14 can connect in 1 cycle T 2
Receive Beacon frame transmitted in 3 cycle Ts of AP11；Such as in the case where N is 4, terminal 14 can connect in 1 cycle T 2
Receive Beacon frame transmitted in 4 cycle Ts of AP11；Such as in the case where N is 5, terminal 14 can connect in 1 cycle T 2
Receive Beacon frame transmitted in 5 cycle Ts of AP11.
Arithmetic is carried out to N number of RSSI using predetermined period as interval it should be understood that terminal 14 can also be arranged according to actual needs
Average treatment, as terminal 14 interval T2=2 (N × T), T2=(N × T)/2 or T2=(N × T)/4 period to N number of RSSI into
The processing of row arithmetic average is to obtain RSSI arithmetic mean of instantaneous value corresponding with N number of RSSI.
In embodiments of the present invention, the number of the RSSI stored after the acquisition of terminal 14 RSSI arithmetic mean of instantaneous value to terminal 14 is clear
It zero and stores again.Such as in the case where N is 3, after terminal 14 obtains the corresponding RSSI arithmetic mean of instantaneous value of 3 RSSI, terminal
14 remove RSSI number of storage, i.e. terminal 14 starts the number for storing RSSI again with 1.
Step S112: RSSI arithmetic mean of instantaneous value is sent to location-server 10 by terminal 14, so that location-server 10
Pass through the position of RSSI arithmetic mean of instantaneous value positioning terminal 14.
In step S112, terminal 14 will send the corresponding RSSI arithmetic mean of instantaneous value of N number of RSSI of Beacon frame with AP11
It is sent to location-server.
Alternatively, it is right after terminal 14 obtains the corresponding RSSI arithmetic mean of instantaneous value of N number of RSSI that AP11 sends Beacon frame
At least two RSSI arithmetic mean of instantaneous value carries out Alpha's filtering；Terminal 14 will be sent out by the RSSI arithmetic mean of instantaneous value of Alpha's filtering
Location-server 10 is given, so that location-server 10 passes through the position of RSSI arithmetic mean of instantaneous value positioning terminal 14.
Above-mentioned steps are only illustrated by taking AP11 as an example, it should be appreciated that above-mentioned steps are not limited to AP11, correspond to other
AP such as AP12 or AP13, working principle is identical as above-mentioned steps, will not repeat them here.
AP of the embodiment of the present invention repeatedly sends the Beacon frame of OFDM modulation by mutiple antennas, and passes through multiple days every time
One in line sends the Beacon frame of OFDM modulation, and wherein aforesaid way directly passes through software realization, so that the Beacon of AP
Frame can be sent directly on antenna without CDD technical treatment, so that being sent to the phase of the Beacon frame of antenna
Position remains unchanged, and reduces the step of CDD technology is delayed to Beacon frame, avoids Beacon frame frequency of occurrences due to phase delay
Fluctuation improves the accuracy that terminal receives Beacon frame.In addition, only sending Beacon frame by single antenna will appear channel resistance
Plug, is easy to cause signal strength that the fast-fading of small scale occurs, is unfavorable for the stability of terminal positioning, and AP of the present invention passes through
Mutiple antennas sends the Beacon frame of OFDM modulation, since the probability that channel block phenomenon occurs simultaneously for mutiple antennas is very low,
Therefore it can be avoided the phenomenon for bringing terminal positioning unstable because individual antenna channel block occurs, effectively improve positioning service
The accuracy and stability of device positioning.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the structural schematic diagram of the first embodiment of AP11 of the present invention in Fig. 1, and Fig. 6 is Fig. 1
The structural schematic diagram of the first embodiment of middle terminal of the present invention.By taking AP11 as an example, AP11 includes data generation module 211, coding
Module 212, planisphere mapping block 213, OFDM modulation module 214, antenna switch module 215, Anneta module 216 and work
Operation mode switching module (not shown).Terminal 14 includes Anneta module 241, low noise amplifier module 242, demodulation modulus module
243, OFDM demodulation module 244, single RSSI computing module 245 and arithmetic average computing module 246.
Data generation module 211 is for generating Beacon frame to be sent.
Optionally, operating mode switching module is used to receive the operating mode instruction of the transmission of location-server 10, and is connecing
It receives and the operating mode of AP11 is switched to Beacon frame sending mode after operating mode instruction.In embodiments of the present invention, fixed
Position server 10, which detects, sends operating mode instruction to Anneta module when having terminal 14 in the signal cover of AP11
216.Anneta module 216 receives and operating mode instruction is sent to operating mode switching module after operating mode instruction.Wherein
The Anneta module 241 of terminal 14 obtains the BSSID for the Beacon frame that AP11 is sent, and by the AP11 Beacon frame sent
BSSID reports location-server 10.Location-server 10 can judge whether terminal 14 covers in the signal of AP11 by BSSID
In range.Wherein, after location-server 10 receives BSSID, location-server 10 is by the data of BSSID and location-server 10
The BSSID saved in library is matched, and when BSSID saved in BSSID and the database of location-server 10 is matched is sentenced
Disconnected terminal 14 is in the signal cover of AP11.
Regardless of whether the operating mode of AP11 is in Beacon frame sending mode, AP11 can generate Beacon to be sent
Frame.But when the operating mode of AP11 is not under Beacon frame sending mode, Beacon frame to be sent transmitted by AP11
Mode is unfavorable for the accuracy that terminal 14 calculates RSSI.In order to improve the accuracy that terminal 14 calculates RSSI, AP11 is in Beacon
Under frame sending mode mode, AP11 generates Beacon frame to be sent as the period using the second time value T1, and wherein this is to be sent
Beacon frame, which needs not move through CDD technical treatment, can be transmitted directly to terminal 14.
Coding module 212 to sent Beacon frame for being encoded.
Planisphere mapping block 213 will be for that will carry out planisphere mapping by the Beacon frame of coding.
OFDM modulation module 214 will be for that will carry out OFDM modulation by the Beacon frame of planisphere mapping.
Antenna switch module 215 is used to receive after the Beacon frame that OFDM is modulated, by OFDM modulation
Beacon is sent to one in the mutiple antennas of Anneta module 216.
Antenna switch module 215 includes at least two switch contact unit, in embodiments of the present invention, day line options
Switch module 215 includes switch contact unit 2151,2152,2153, and antenna switch module 215 is being received by OFDM tune
After the Beacon frame of system, OFDM modulation module 214 passes through one and antenna mould in switch contact unit 2151,2152,2153
Block 216 connects, so that OFDM modulation module 214 is by one in switch contact unit 2151,2152,2153 by OFDM tune
The Beacon frame of system is sent to Anneta module 216.
Anneta module 216 passes through multiple days of Anneta module 216 for repeatedly sending the Beacon of OFDM modulation every time
One in line sends the Beacon frame of OFDM modulation.Wherein, the Beacon frame of Anneta module 216 the M times transmission OFDM modulation
It is different that used antenna and the M+1 times send antenna used in the Beacon frame of OFDM modulation, wherein M be more than or equal to
2 positive integer, mutiple antennas are at least two antenna.
In embodiments of the present invention, Anneta module 216 includes first day corresponding with first day switch contact unit 2151
Line 2161 and corresponding second antenna 2162 of second switch contact point unit 2152 and corresponding with third switch contact unit 2153
Third antenna 2163.
Alternatively, as shown in fig. 7, AP11 further includes digital-to-analogue modulation module 316 and amplification module 317.Its line options is opened
It closes module 315 to receive after the Beacon frame that OFDM is modulated, sends digital-to-analogue modulation module for the OFDM Beacon frame modulated
One in multiple digital-to-analogue modulation units in 316.Plurality of digital-to-analogue modulation unit include the first digital-to-analogue modulation unit 3161,
Second digital-to-analogue modulation unit 3162 and third digital-to-analogue modulation unit 3163.Digital-to-analogue modulation module 316 is after receiving OFDM modulation
Beacon frame after, the modulated Beacon frame of OFDM is converted into analog signal Beacon frame, and by analog signal Beacon
Frame carries out carrier modulation.Wherein, the quantity of switch contact unit is identical as the quantity of digital-to-analogue modulation unit, and switch contact unit
It being corresponded with digital-to-analogue modulation unit, i.e., the first digital-to-analogue modulation unit 3161 is corresponding with first day switch contact unit 2151, the
Two digital-to-analogue modulation units 3162 are corresponding with second day switch contact unit 2152, and third digital-to-analogue modulation unit 3163 is opened with third day
It is corresponding to close contact point unit 2153.Amplification module 317 is for amplifying the Beacon frame Jing Guo carrier modulation to be amplified
Signal Beacon frame, and amplified signal Beacon frame is sent to Anneta module 318, to pass through Anneta module more than 318 times transmissions
Amplified signal Beacon frame.Wherein, amplification module 317 includes first amplifying unit corresponding with the first digital-to-analogue modulation unit 3161
3171, corresponding with corresponding second amplifying unit 3172 of the second digital-to-analogue modulation unit 3162 and with third digital-to-analogue modulation unit 3163
Third amplifying unit 3173.
In embodiments of the present invention, it is week that Anneta module 216, which receives first time value T, AP11 from location-server 10 with T,
Phase repeatedly sends Beacon frame by mutiple antennas.Wherein value T is in the second time value T1 and third time value T2 at the first time
Maximum value, i.e. location-server 10 receives the second time value T1 and third time value T2, and by the second time value T1 and third
Maximum value in time value T2 is sent to Anneta module 216 as value T at the first time.Second time value T1 is that AP11 generation is pending
The period of the Beacon frame sent, third time value T2 are the period that terminal 14 updates RSSI, i.e. third time value T2 is positioning clothes
The period of the specific location for 10 positioning terminal 14 of device of being engaged in.
Alternatively, cycle T may be T1.I.e. Anneta module 216 receives value T at the first time from location-server 10,
So that AP11 passes through a transmission Beacon frame in mutiple antennas by the period of T by Anneta module 216.Wherein, first
Time value T is the second time value T1 that AP11 generates Beacon frame to be sent.
The Anneta module 241 of terminal 14 is used to receive the Beacon frame of AP11 transmission.
The Beacon frame that low noise amplifier module 242 is used to send AP11 carries out low noise amplification.
Modulus module 243 is demodulated for carrier wave demodulation will to be carried out by the Beacon frame of low noise amplification, and by carrier wave solution
The Beacon frame of tune is converted to digital signal Beacon frame.
OFDM demodulation module 244 is used to digital signal Beacon frame carrying out OFDM demodulation.
Single RSSI computing module 245 for receiving the Beacon frame after OFDM demodulation, and to demodulation after
Beacon frame is calculated to obtain the RSSI of Beacon frame.
Arithmetic average computing module 246 is used to store the RSSI of Beacon frame, while judging whether the number of RSSI is equal to
N, and when the number for determining RSSI is equal to N, arithmetic average processing is carried out to N number of RSSI, it is corresponding with N number of RSSI to obtain
RSSI arithmetic mean of instantaneous value.Wherein, terminal, which is obtained, carries out the RSSI of the Beacon frame of terminal storage with after RSSI arithmetic mean of instantaneous value
It resets and stores again, wherein N is the positive integer more than or equal to 2.
Wherein, the judgement of arithmetic average computing module 246 is stored in same AP in arithmetic average computing module 246 and sends
Whether the number of the RSSI of Beacon frame is equal to N, i.e. the judgement of arithmetic average computing module 246 is stored in arithmetic average computing module
Whether the number for the RSSI that the AP11 in 246 sends Beacon frame is equal to N.Arithmetic average computing module 246 is stored in determination
When the number that AP11 in arithmetic average computing module 246 sends the RSSI of Beacon frame is equal to N, Beacon frame is sent to AP11
N number of RSSI carry out arithmetic average processing, to obtain and the corresponding RSSI arithmetic average of AP11 transmission N number of RSSI of Beacon frame
Value.
For example, when such as N is 3, single RSSI computing module 245 receives the 1st AP11 in the 1st cycle T and sends
When the RSSI of Beacon frame, arithmetic average computing module 246 stores the 1st RSSI, while arithmetic average computing module 246 judges
Whether the number of RSSI is equal to N, and the number of RSSI is 1 less than N this moment, then arithmetic average computing module 246 continues storage the 2nd
RSSI；For single RSSI computing module 245 when the 2nd cycle T receives the 2nd AP11 and send the RSSI of Beacon frame, arithmetic is flat
Equal computing module 246 stores the 2nd RSSI, while arithmetic average computing module 246 judges whether the number of RSSI is equal to N, this
The number for carving RSSI is 2 less than N, then arithmetic average computing module 246 continues to store the 3rd RSSI.Single RSSI computing module
245 when the 3rd cycle T receives the 3rd AP11 and sends the RSSI of Beacon frame, and arithmetic average computing module 246 stores the 3rd
RSSI, while arithmetic average computing module 246 judges whether the number of RSSI is equal to N, the number of RSSI is 3 equal to N this moment, then
Arithmetic average computing module 246 carries out arithmetic average processing to 3 AP11 RSSI for sending Beacon frame to obtain 3 AP11 hairs
Send the corresponding RSSI arithmetic mean of instantaneous value of the RSSI of Beacon frame.That is, during arithmetic average computing module 246 is week with T2
Arithmetic average processing, which is carried out, every the RSSI for sending Beacon frame to N number of AP11 sends Beacon frame with N number of AP11 to obtain
The corresponding RSSI arithmetic mean of instantaneous value of RSSI.Wherein T2=N × T, T are that the Anneta module 216 of AP11 sends the period of Beacon frame.
The cycle T 2 that terminal 14 updates RSSI is that AP11 passes through N times that Anneta module 216 sends the cycle T of Beacon frame, and N can be big
In or equal to 2 any positive integer, can be avoided 14 frequent updating RSSI of terminal and power consumption caused to increase.Such as the case where N is 3
Under, terminal 14 can receive Beacon frame transmitted in 3 cycle Ts of AP11 in 1 cycle T 2；As N be 4 when, terminal
14 can receive Beacon frame transmitted in 4 cycle Ts of AP11 in 1 cycle T 2；As N be 5 when, terminal 14 is at 1
Beacon frame transmitted in 5 cycle Ts of AP11 can be received in cycle T 2.
It should be understood that it is interval to N number of that arithmetic average computing module 246 can also be arranged according to actual needs using predetermined period
RSSI carries out arithmetic average processing, if arithmetic average computing module 246 is in interval T2=2 (N × T), T2=(N × T)/2 or T2
=(N × T)/4 period carries out arithmetic average processing to N number of RSSI to obtain RSSI arithmetic mean of instantaneous value corresponding with N number of RSSI.
In embodiments of the present invention, to arithmetic average meter after the acquisition of arithmetic average computing module 246 RSSI arithmetic mean of instantaneous value
The number for calculating the RSSI that module 246 stores resets and stores again.Such as in the case where N is 3, in arithmetic average computing module
After 246 obtain the corresponding RSSI arithmetic mean of instantaneous value of 3 RSSI, arithmetic average computing module 246 removes RSSI number of storage, i.e.,
Arithmetic average computing module 246 starts the number for storing RSSI again with 1.
Arithmetic average computing module 246 calculate obtain RSSI arithmetic mean of instantaneous value after, Anneta module 241 be also used to by with
The corresponding RSSI arithmetic mean of instantaneous value of N number of RSSI that AP11 sends Beacon frame is sent to location-server 10, so that positioning clothes
Business device 10 passes through the position of RSSI arithmetic mean of instantaneous value positioning terminal 14.
Alternatively, as shown in figure 8, terminal 14 further includes Alpha's filter module 347, arithmetic average computing module
After 346 obtain the corresponding RSSI arithmetic mean of instantaneous value of N number of RSSI that AP11 sends Beacon frame, arithmetic average computing module 346 will
RSSI arithmetic mean of instantaneous value is sent to Alpha's filter module 347, and Alpha's filter module 347 is used for at least two RSSI
Arithmetic mean of instantaneous value carries out Alpha's filtering, and will be sent out by the RSSI arithmetic mean of instantaneous value of Alpha's filtering by Anneta module 341
Location-server 10 is given, so that location-server 10 passes through the position of RSSI arithmetic mean of instantaneous value positioning terminal 14.
AP of the embodiment of the present invention repeatedly sends the Beacon frame of OFDM modulation by mutiple antennas, and passes through multiple days every time
One in line sends the Beacon frame of OFDM modulation, and wherein aforesaid way directly passes through software realization, so that the Beacon of AP
Frame can be sent directly on antenna without CDD technical treatment, so that being sent to the phase of the Beacon frame of antenna
Position remains unchanged, and reduces the step of CDD technology is delayed to Beacon frame, avoids Beacon frame frequency of occurrences due to phase delay
Fluctuation improves the accuracy that terminal receives Beacon frame.In addition, only sending Beacon frame by single antenna will appear channel resistance
Plug, is easy to cause signal strength that the fast-fading of small scale occurs, is unfavorable for the stability of terminal positioning, and AP of the present invention passes through
Mutiple antennas sends the Beacon frame of OFDM modulation, since the probability that channel block phenomenon occurs simultaneously for mutiple antennas is very low,
Therefore it can be avoided the phenomenon for bringing terminal positioning unstable because individual antenna channel block occurs, effectively improve positioning service
The accuracy and stability of device positioning.
Please refer to Fig. 9 and Figure 10, Fig. 9 is the structural schematic diagram of the 3rd embodiment of AP11 of the present invention in Fig. 1, and Figure 10 is figure
The structural schematic diagram of the 3rd embodiment of terminal of the present invention in 1.AP11 includes processor 411 and antenna 412,411 He of processor
Antenna 412 is connected by bus 413.Terminal 14 includes processor 441 and antenna 442, and processor 441 and antenna 442 pass through total
Line 443 is connected.Processor 411 and processor 441 are baseband chip.It should be understood that processor 411 and processor 441 can also be
Central processing unit (English: central processing unit, abbreviation: CPU) or other chips, wherein work as processor
411 and processor 441 can also be CPU when, further relate to one with CPU cooperation reservoir.
Processor 411 generates Beacon frame to be sent.
Optionally, antenna 412 receives the operating mode instruction that location-server 10 is sent, and processor 411 is receiving work
The operating mode of AP11 is switched to Beacon frame sending mode after operation mode instruction.AP11 is in Beacon frame sending mode mode
Under, processor 411 generates Beacon frame to be sent as the period using the second time value T1, wherein the Beacon frame to be sent without
Terminal 14 need to can be transmitted directly to by CDD technical treatment.
In embodiments of the present invention, location-server 10 detects hair when having terminal 14 in the signal cover of AP11
Send operating mode instruction to antenna 412.Antenna 412 receives and operating mode instruction is sent to processor after operating mode instruction
411.Wherein the antenna 442 of terminal 14 obtains the BSSID for the Beacon frame that AP11 is sent by antenna 412, and AP11 is passed through
The BSSID for the Beacon frame that antenna 412 is sent reports location-server 10.Location-server 10 can be judged eventually by BSSID
Whether end 14 is in the signal cover of AP11.Wherein, after location-server 10 receives BSSID, location-server 10 will
The BSSID saved in BSSID and the database of location-server 10 is matched, and in the number of BSSID and location-server 10
Judge terminal 14 in the signal cover of AP11 when according to the BSSID matching saved in library.
Processor 411 is encoded to sent Beacon frame.
Processor 411 will carry out planisphere mapping by the Beacon frame of coding.
Processor 411 will carry out OFDM modulation by the Beacon frame of planisphere mapping.
Processor 411, which receives, passes through the modulated Beacon frame of OFDM, and the OFDM Beacon modulated is sent to antenna
One in 412.
Mutiple antennas more than 412 times one for sending the Beacon that OFDM is modulated, and passing through in mutiple antennas 412 every time sends
The Beacon frame of OFDM modulation.Wherein, antenna and the M+1 times transmission used in the Beacon frame of the M times transmission OFDM modulation
Antenna used in the Beacon frame of OFDM modulation is different, and wherein M is the positive integer more than or equal to 2, and antenna 412 is at least 2
It is a.
Alternatively, processor 411, which receives, passes through the modulated Beacon frame of OFDM, by the modulated Beacon frame of OFDM
Analog signal Beacon frame is converted to, and analog signal Beacon frame is subjected to carrier modulation；Processor 411 will pass through carrier wave tune
The Beacon frame of system amplifies to obtain amplified signal Beacon frame, and amplified signal Beacon frame is sent to antenna 412；
More than 412 transmission amplified signal Beacon frames of mutiple antennas, and pass through a transmission amplified signal in mutiple antennas 412 every time
Beacon frame.
In embodiments of the present invention, antenna 412 receives first time value T, AP11 from location-server 10 and leads to by the period of T
Cross more than 412 transmission Beacon frames of mutiple antennas.Wherein value T is in the second time value T1 and third time value T2 at the first time
Maximum value, i.e. location-server 10 receive the second time value T1 and third time value T2, and when by the second time value T1 and third
Between maximum value in value T2 be sent to antenna 412 as value T at the first time.Second time value T1 generates to be sent for AP11
The period of Beacon frame, third time value T2 are the period that terminal 14 updates RSSI, i.e. third time value T2 is location-server
The period of the specific location of 10 positioning terminals 14.
Alternatively, cycle T may be T1.I.e. antenna 412 receives value T, AP11 at the first time from location-server 10
Pass through more than 412 transmission Beacon frames of mutiple antennas by the period of T.Wherein, first time value T is generated to be sent for AP11
Second time value T1 of Beacon frame.
The antenna 442 of terminal 14 receives the Beacon frame that the antenna 412 of AP11 is sent.Antenna 442 is at least one antenna.
The Beacon frame that processor 441 sends the antenna 412 of AP11 carries out low noise amplification.
Processor 441 will carry out carrier wave demodulation by the Beacon frame of low noise amplification, and by the Beacon of carrier wave demodulation
Frame is converted to digital signal Beacon frame.
Digital signal Beacon frame is carried out OFDM demodulation by processor 441.
Processor 441 receives Beacon frame after OFDM demodulation, and to the Beacon frame after demodulation calculated with
Obtain the RSSI of Beacon frame.
Processor 441 stores the RSSI of Beacon frame, while judging whether the number of RSSI is equal to N, and determining RSSI
Number when being equal to N, arithmetic average processing is carried out to N number of RSSI, to obtain corresponding with N number of RSSI RSSI arithmetic mean of instantaneous value.
Wherein, processor 441 is zeroed out the RSSI of the Beacon frame of terminal storage after obtaining with RSSI arithmetic mean of instantaneous value and again
Storage, wherein N is the positive integer more than or equal to 2.
Wherein, whether the number of the RSSI for the AP11 transmission Beacon frame that the judgement of processor 441 is stored in processor 441
Equal to N；Processor 441 when determining that the AP11 that is stored in processor 441 sends the number of the RSSI of Beacon frame and is equal to N,
Arithmetic average processing is carried out to the AP11 N number of RSSI for sending Beacon frame, to obtain the N number of RSSI for sending Beacon frame with AP11
Corresponding RSSI arithmetic mean of instantaneous value.
In embodiments of the present invention, RSSI's processor 441 stored after the acquisition of processor 441 RSSI arithmetic mean of instantaneous value
Number resets and stores again.
Antenna 442 will send the corresponding RSSI arithmetic mean of instantaneous value of N number of RSSI of Beacon frame with AP11 and be sent to positioning clothes
Business device 10, so that location-server 10 passes through the position of RSSI arithmetic mean of instantaneous value positioning terminal 14.
Alternatively, processor 441 obtains the corresponding RSSI arithmetic mean of instantaneous value of N number of RSSI that AP11 sends Beacon frame
Afterwards, processor 441 carries out Alpha's filtering at least two RSSI arithmetic mean of instantaneous value, and will calculate by the RSSI of Alpha's filtering
Art average value is sent to location-server 10 by antenna 442, so that location-server 10 is fixed by RSSI arithmetic mean of instantaneous value
The position of position terminal 14.
AP of the embodiment of the present invention repeatedly sends the Beacon frame of OFDM modulation by mutiple antennas, and passes through multiple days every time
One in line sends the Beacon frame of OFDM modulation, and wherein aforesaid way directly passes through software realization, so that the Beacon of AP
Frame can be sent directly on antenna without CDD technical treatment, so that being sent to the phase of the Beacon frame of antenna
Position remains unchanged, and reduces the step of CDD technology is delayed to Beacon frame, avoids Beacon frame frequency of occurrences due to phase delay
Fluctuation improves the accuracy that terminal receives Beacon frame.In addition, only sending Beacon frame by single antenna will appear channel resistance
Plug, is easy to cause signal strength that the fast-fading of small scale occurs, is unfavorable for the stability of terminal positioning, and AP of the present invention passes through
Mutiple antennas sends the Beacon frame of OFDM modulation, since the probability that channel block phenomenon occurs simultaneously for mutiple antennas is very
It is low, therefore can be avoided the phenomenon for bringing terminal positioning unstable because individual antenna channel block occurs, effectively improve positioning
The accuracy and stability of server selection.
In above description, for illustration and not for limitation, propose such as specific system structure, interface, technology it
The detail of class, so as to provide a thorough understanding of the present application.However, it will be clear to one skilled in the art that there is no these specific
The application also may be implemented in the other embodiment of details.In other situations, omit to well-known device, circuit with
And the detailed description of method, so as not to obscure the description of the present application with unnecessary details.
Claims (12)
1. a kind of processing method of Beacon frame, which is characterized in that the treating method comprises:
AP receives the Beacon frame Jing Guo modulating in OFDM, and repeatedly sends the OFDM tune by mutiple antennas
The Beacon frame of system, and the Beacon frame of the OFDM modulation is sent by one in the multiple antenna every time；
Wherein, the Beacon frame that the OFDM modulation is repeatedly sent by mutiple antennas, and pass through the multiple day every time
One in line directly passes through software realization the step of sending the Beacon frame of the OFDM modulation, so that the AP
Beacon frame is sent directly on the antenna without CDD technical treatment.
2. processing method according to claim 1, which is characterized in that the processing method further include:
The AP receives the operating mode instruction that location-server is sent, and the operating mode of the AP is switched to Beacon frame
Sending mode, wherein the location-server, which detects, sends the work when having terminal in the signal cover of the AP
Mode instruction is to the AP.
3. processing method according to claim 2, which is characterized in that
Value T, the AP are multiple by the multiple antenna by the period of T at the first time from location-server reception by the AP
Sending the Beacon frame, wherein the first time value T is the maximum value in the second time value T1 and third time value T2,
The second time value T1 is the period that the AP generates Beacon frame to be sent, and the third time value T2 is the terminal
Update the period of RSSI.
4. processing method according to claim 2, which is characterized in that
Value T, the AP are multiple by the multiple antenna by the period of T at the first time from location-server reception by the AP
Send the Beacon frame, wherein the first time value T is the second time value that the AP generates Beacon frame to be sent
T1。
5. a kind of access point AP, which is characterized in that the AP includes antenna switch module and Anneta module:
The antenna switch module is used to receive after the Beacon frame that OFDM is modulated, and the OFDM is modulated
Beacon is sent to one in the mutiple antennas of the Anneta module；
The Anneta module is used to repeatedly send the Beacon of the OFDM modulation, and passes through the multiple of the Anneta module every time
One in antenna sends the Beacon frame of the OFDM modulation, wherein the multiple antenna is at least two antenna；
Wherein, the Beacon frame that the OFDM modulation is repeatedly sent by mutiple antennas, and pass through the multiple day every time
One in the line Beacon frame for sending the OFDM modulation directly passes through software realization, so that the Beacon frame of the AP is not
It is sent directly on the antenna by CDD technical treatment.
6. AP according to claim 5, which is characterized in that the AP further includes operating mode switching module, for receiving
The operating mode instruction that location-server is sent, and the operating mode of the AP is switched to Beacon frame sending mode, wherein
The location-server, which detects, sends the operating mode instruction to institute when having terminal in the signal cover of the AP
State AP.
7. AP according to claim 6, which is characterized in that
The Anneta module is also used to receive value T at the first time from the location-server, and the Anneta module is logical by the period of T
It crosses the multiple antenna and repeatedly sends the Beacon frame, wherein when the first time value T is the second time value T1 and third
Between maximum value in value T2, the second time value T1 is the period that the AP generates Beacon frame to be sent, the third
Time value T2 is the period that the terminal updates RSSI.
8. AP according to claim 6, which is characterized in that
The Anneta module is also used to receive value T at the first time from the location-server, and the Anneta module is logical by the period of T
It crosses the multiple antenna and repeatedly sends the Beacon frame, wherein the first time value T generates to be sent for the AP
Second time value T1 of Beacon frame.
9. a kind of processing method of Beacon frame, which is characterized in that the treating method comprises:
Terminal obtains the Beacon frame Jing Guo OFDM demodulation, and is calculated the Beacon frame of the OFDM demodulation to obtain
State the received signal strength indicator RSSI of the Beacon frame of OFDM demodulation；
The terminal stores the RSSI, while judging the Beacon frame for the OFDM demodulation that same AP is sent in the terminal
The number of the RSSI whether be equal to N, and when the number for determining the RSSI is equal to N, arithmetic is carried out to N number of RSSI
Average treatment, to obtain RSSI arithmetic mean of instantaneous value corresponding with the N number of RSSI, wherein the terminal obtains the RSSI calculation
The number of the RSSI of the terminal storage is zeroed out after art average value and is stored again, wherein N be more than or equal to
2 positive integer；
The RSSI arithmetic mean of instantaneous value is reported to location-server by the terminal, so that the location-server is described in
RSSI arithmetic mean of instantaneous value positions the position of the terminal.
10. processing method according to claim 9, which is characterized in that the processing method further include:
The terminal obtains the basic service set identifier BSSID for the Beacon frame that the AP is sent, and the AP is sent
The BSSID of Beacon frame reports the location-server, so that the location-server judges the end by the BSSID
It holds whether in the signal cover of the AP, wherein after the location-server receives the BSSID, by the BSSID
It is matched with the BSSID saved in the database of the location-server, and in the BSSID and the location-server
Judge the terminal in the signal cover of the AP when BSSID matching saved in database.
11. a kind of terminal, which is characterized in that the terminal includes:
Single RSSI computing module, for after obtaining Beacon frame by OFDM demodulation, to the OFDM demodulation
Beacon frame is calculated to obtain the RSSI of the Beacon frame of the OFDM demodulation；
Arithmetic average computing module for storing the RSSI, while judging the OFDM that same AP is sent in the terminal
Whether the number of the RSSI of the Beacon frame of demodulation is equal to N, and when the number for determining the RSSI is equal to N, to N number of institute
It states RSSI and carries out arithmetic average processing, to obtain RSSI arithmetic mean of instantaneous value corresponding with the N number of RSSI, wherein the terminal
The number of the RSSI of the terminal storage is zeroed out after obtaining the RSSI arithmetic mean of instantaneous value and is stored again,
In, N is the positive integer more than or equal to 2；
Anneta module, for the RSSI arithmetic mean of instantaneous value to be reported to location-server, so that the location-server is logical
Cross the position that the RSSI arithmetic mean of instantaneous value positions the terminal.
12. terminal according to claim 11, which is characterized in that
The Anneta module is also used to obtain the BSSID for the Beacon frame that the AP is sent, and the Beacon that the AP is sent
The BSSID of frame reports the location-server, so that whether the location-server judges the terminal by the BSSID
In the signal cover of the AP, wherein after the location-server receives the BSSID, by the BSSID with it is described
The BSSID saved in the database of location-server is matched, and in the database of the BSSID and the location-server
Judge the terminal in the signal cover of the AP when BSSID matching of middle preservation.
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| CN101842715A (en) * | 2007-10-29 | 2010-09-22 | 诺基亚公司 | Indoor positioning system and method |
| CN101459870A (en) * | 2008-03-05 | 2009-06-17 | 中科院嘉兴中心微系统所分中心 | Indoor positioning system based on wireless sensor network and implementing method |
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