CN104243059B - A kind of relay transmission system based on WLAN and optimization method - Google Patents
A kind of relay transmission system based on WLAN and optimization method Download PDFInfo
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- CN104243059B CN104243059B CN201410427962.5A CN201410427962A CN104243059B CN 104243059 B CN104243059 B CN 104243059B CN 201410427962 A CN201410427962 A CN 201410427962A CN 104243059 B CN104243059 B CN 104243059B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
By relay transmission system and the relay transmission optimization method of the present invention, can automatically measure the radiofrequency signal leakage power situation of trunking, and according to described measurement adaptive optimization relay transmission, it is effectively increased the efficiency of relay transmission and greatly reduces power consumption, there is useful technique effect.
Description
Technical field
The present invention relates to relay transmission field, particularly relate to a kind of relay transmission system based on WLAN and optimization side
Method.
Background technology
Along with developing rapidly of WiMAX business of networking, wireless home gateway production development is swift and violent, but high-power wireless office
Territory net (Wireless Local Area Network, WLAN) equipment physical layout has certain limitation and WiMAX
(wireless fidelity, WIFI) signal penetration capacity is more weak, causes WIFI signal to cover and there is certain blind area, thus gives WLAN
The development of signal relay equipment WLAN Repeater brings opportunity, and wherein, WLAN Repeater includes WLAN access point
The WLANAP side of side (Access Point, AP) and wlan client side Client, WLAN Repeater can accept work
Stand the access of (Station, STA) equipment；Other AP can be removed to connect as STA in WLAN Client side, can be well
Extension as WIFI signal effectively solves WIFI signal covering problem, at present, the WLAN Repeater product on market,
When downstream interface (WLAN AP interface) and upstream Interface (WLAN Client interface) carry out data transmission, by WLAN AP
The wireless STAMAC address hung under side has replaced to the MAC Address of WLAN Client side of Repeater self, therefore,
Existing Repeater product is not a WIFI signal repeater truly.
Revealing it addition, existing trunking exists the most universal radiofrequency signal, this causes the signal meeting that forwarding antenna is launched
Again received by reception antenna, thus cause serious radiofrequency signal to be vibrated, trunking can be burnt out time serious, also can simultaneously
Severe jamming is caused in base station, cause large area user cannot proper communication, the most how to measure and optimize the radio frequency of trunking
Signal leakage power is also one of problem needing solution.
Summary of the invention
It is an object of the invention to be achieved through the following technical solutions.
According to the embodiment of the present invention, proposing a kind of relay transmission system based on WLAN, described system includes
WLAN reception antenna, WLAN forwarding antenna, optimization main control unit and WLAN relay process unit；Described optimization master control
Unit comprises measurement step-length tuner further, measurement coefficient analyser, radiofrequency signal leakage power are than computer, and relays
Transmission optimization unit；Measure coefficient analyser and farther include extreme value comparator, delay comparator and effectiveness discriminator；WLAN
Relay process unit comprises signal generation unit and signal processing unit further；Signal generation unit farther includes to be sequentially connected with
Measuring transmitter, smoothing filter, D/A converter, frequency up converters, the first variable gain modulator, power
Amplifier and transmitter, the output of described transmitter connects WLAN forwarding antenna, and the input of described measuring transmitter connects
Measure step-length tuner；Receptor that described signal processing unit farther includes to be sequentially connected with, low-noise amplifier, second can
Variable-gain actuator, down-converter, A/D converter, matched filtering device, digital correlator, averager and comparator,
The input of described receptor connects WLAN reception antenna, and the output of described comparator connects measures coefficient analyser, described measurement
The output of coefficient analyser respectively connect measurement step-length tuner and radiofrequency signal leakage power than computer, described radiofrequency signal is let out
Dew power connects relay transmission than the output of computer and optimizes unit, and the output of described measurement step-length tuner is also connected with described
Averager；
Wherein, described optimization main control unit is connected by general purpose I/O with WLAN relay process unit, WLAN relay process unit
It is connected with WLAN forwarding antenna and WLAN reception antenna；Optimize main control unit periodically by radiofrequency signal leakage power
It is sent to WLAN relay process unit than measuring parameter；WLAN relay process unit is revealed according to the radiofrequency signal received
Power generates transmission signal than measuring parameter, is transmitted by WLAN forwarding antenna by transmission signal；Send signal through penetrating
Frequency loss channel reaches WLAN reception antenna, is formed and receives signal；WLAN relay process unit receives sky by WLAN
Line receives signal, and processes than the measurement parameter docking collection of letters number according to radiofrequency signal leakage power, generates and measures intermediate parameters,
And be sent to optimize main control unit；Optimizing main control unit utilizes the measurement intermediate parameters received to generate radiofrequency signal leakage power ratio
Measurement result.
According to the embodiment of the present invention, described measurement step-length tuner using sequence repetition number N and pendulous frequency C as penetrating
Frequently signal leakage power initializes than measuring parameter；This measurement step-length tuner is receiving described radiofrequency signal leakage power ratio
After measurement instruction, initialized described sequence repetition number N is sent respectively to measuring transmitter and averager, and with solid
Determine interval to continuously transmit C time；After this measurement step-length tuner once receives the parameter adjustment message that effectiveness discriminator sends, then
Increase sequence repetition number N, and will increase after sequence repetition number N be sent respectively to measuring transmitter and averager,
And continuously transmit C time with fixed interval；Pendulous frequency C is sent respectively to extreme value comparator and delay by this measurement step-length tuner
Comparator；
Described measuring transmitter generates the measurement pilot frequency sequence of a length of N*L according to described sequence repetition number N, should
Sequence, with L as cycle, repeats n times, N and L is natural number, and N ＞ 1；
The measurement pilot frequency sequence that measuring transmitter is formed by described smoothing filter processes, and forms smooth numeral letter
Number；
The digital signal that smoothing filter is formed is converted to base-band analog signal by described D/A converter；
The base-band analog signal that D/A converter is formed is up-converted to frequency band analogue signal by described frequency up converters；
Described first variable gain modulator realizes sending the Continual Gain Actuator of signal and is automatically adjusted；
Described power amplifier carries out power amplification and forms transmission signal the signal after performing gain-adjusted；
The described transmission signal that power amplifier is formed by described transmitter is sent to WLAN forwarding antenna；
Described receptor receives the described reception signal from WLAN reception antenna, and is sent to low by described reception signal
Noise amplifier；
Described low-noise amplifier reduces the out-of-band noise of described reception signal, amplifies inband signaling；
Second variable gain modulator realizes receiving the Continual Gain Actuator of signal and is automatically adjusted；
Signal after gain-adjusted is down-converted to base-band analog signal from frequency band analogue signal by described down-converter；
The base-band analog signal that down-converter is formed is converted to digital signal by described A/D converter；
Described matched filtering device is corresponding with smoothing filter, is converted to a length of by the digital signal that A/D converter is formed
The Serial No. of N*L；
The Serial No. that matched filtering device is formed by described digital correlator carries out correlation computations, generates the relevant of a length of N*L
Value sequence；
Digital correlator formation is correlated with by described averager according to the described sequence repetition number N measuring the transmission of step-length tuner
Value sequence carries out N-1 time with L for the cycle and adds up, and forms the accumulated value sequence of a length of L；
The value of L element in the accumulated value sequence that averager is formed by described comparator compares, and obtains accumulated value extreme value
And extreme value place；Described accumulated value extreme value is sent to extreme value comparator, described extreme value place is sent to delay comparator；
Described extreme value comparator calculates the variance of C the accumulated value extreme value continuously received, and enters with default extreme value variance thresholding
Row compares, and result of the comparison is sent to effectiveness discriminator；
Described delay comparator calculates the variance of C extreme value place continuously received, and with default extreme value place variance thresholding
Compare, and result of the comparison is sent to effectiveness discriminator；
Result and the result of delay comparator transmission that described extreme value comparator is sent by described effectiveness discriminator judge；
If described accumulated value extreme value variance is more than described default extreme value variance thresholding, or extreme value place variance is more than described default pole
Value position variance thresholding, then effectiveness discriminator sends described parameter adjustment message to measuring step-length tuner；Otherwise, effectiveness
Discriminator sends the average of described C accumulated value extreme value to radiofrequency signal leakage power than computer；
Described radiofrequency signal leakage power is believed according to the mean value computation radio frequency of described C the accumulated value extreme value received than computer
Number leakage power ratio, and result of calculation is sent to relay transmission as described radiofrequency signal leakage power than measurement result optimizes single
Unit.
According to the embodiment of the present invention, described digital correlator is made up of multiple time delay elements and multiple adder, specifically wraps
Including: input signal is divided into two-way, the first time delay elements is sent on a road, is respectively fed to first and adds after 128 clock cycle of time delay
Musical instruments used in a Buddhist or Taoist mass and second adder, another road is directly sent to first adder and second adder；At first adder by two paths of signals phase
Add, at second adder, two paths of signals is subtracted each other；
The second time delay elements is sent in the output of first adder, is respectively fed to the 3rd adder after 64 clock cycle of time delay
With the 4th adder；The output of second adder is sent directly into the 3rd adder and the 4th adder respectively；Will in the 3rd adder
Two paths of signals is added, and is subtracted each other by two paths of signals in the 4th adder；
The 3rd time delay elements is sent in the output of the 3rd adder, is respectively fed to fifth adder after 16 clock cycle of time delay
With the 6th adder；The output of the 4th adder is sent directly into fifth adder and the 6th adder respectively；Will in fifth adder
Two paths of signals subtracts each other, and is added by two paths of signals in the 6th adder；
The 4th time delay elements is sent in the output of fifth adder, sends into the 7th adder after 32 clock cycle of time delay；The
The output of six adders is directly sent to the 7th adder, is subtracted each other by two paths of signals in the 7th adder；
The output of the 7th adder is divided into two-way: the 5th time delay elements is sent on a road, send respectively after 8 clock cycle of time delay
Entering the 8th adder and the 9th adder, another road is sent directly into the 8th adder and the 9th adder；In the 9th adder by two
Road signal is added, and is subtracted each other by two paths of signals in the 8th adder；
The 6th time delay elements is sent in the output of the 9th adder, sends into the tenth adder after 1 clock cycle of time delay；8th adds
The output of musical instruments used in a Buddhist or Taoist mass is sent directly into the tenth adder, is subtracted each other by two paths of signals in the tenth adder；
The output of the tenth adder is divided into two-way: the 7th time delay elements is sent on a road, send respectively after 4 clock cycle of time delay
Entering the 11st adder and the 12nd adder, another road is sent directly into the 11st adder and the 12nd adder；The tenth
Two paths of signals is added by one adder, is subtracted each other by two paths of signals the 12nd adder；
The 8th time delay elements is sent in the output of the 11st adder, sends into the 13rd adder after 2 clock cycle of time delay；
The output of the 12nd adder is sent directly into the 13rd adder, is subtracted each other by two paths of signals in the 13rd adder, is mated
Wave filter finally export result.
According to the embodiment of the present invention, the transmission optimization method of described relay transmission system based on WLAN is specifically wrapped
Include:
S1, relay transmission optimize unit and obtain the radiofrequency signal leakage power ratio of trunking；
S2, this radiofrequency signal leakage power ratio is compared with system gain, if radiofrequency signal leakage power ratio ＞
One threshold value, then judge that radiofrequency signal leakage power ratio is good, perform step S3；If Second Threshold≤radiofrequency signal leakage power ratio
Value≤first threshold, then judge that radiofrequency signal leakage power ratio is general, perform step S6；If radiofrequency signal leakage power ratio ＜
Second Threshold, then judge radiofrequency signal leakage power ratio, it is impossible to communicate；
The actual gain of S3, order reception and conversion link is theoretical gain, performs step S4；
S4, judge the scope of starting to control of automatic growth control whether more than 0dB, if more than 0dB, then regulation radio frequency loss to from
The scope of starting to control of dynamic gain control is 0dB；
Whether S5, the output of detecting system are full power output, make system reach if it has not, then reduce link gain value
Full power exports, if being unable to reach full power output, then reduces the yield value of link to 0dB；
S6, order receive and the actual gain=radiofrequency signal leakage power ratio-gain adjustment value of conversion link, perform step S7；
S7, on the basis of the actual gain of this reception and conversion link, it is judged that whether the scope of starting to control of automatic growth control is more than
0dB, if more than 0dB, then regulation radio frequency loss is 0dB to the scope of starting to control of automatic growth control, performs step S8；
Whether S8, the output of detecting system are full power output, make system reach if it has not, then reduce link gain value
Full power exports, if being unable to reach full power output, then reduces the yield value of link and to the reception obtained in step S6 and forwards chain
The actual gain on road.
Compared to prior art, by relay transmission system and the relay transmission optimization method of the present invention, can automatically measure
The radiofrequency signal leakage power situation of trunking, and according to described measurement adaptive optimization relay transmission, in being effectively increased
The efficiency transmitted that continues also greatly reduces power consumption, has useful technique effect.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit for ordinary skill
Personnel will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred implementation, and is not considered as limitation of the present invention.
And in whole accompanying drawing, it is denoted by the same reference numerals identical parts.In the accompanying drawings:
Accompanying drawing 1 shows the relay transmission system structural representation based on WLAN according to embodiment of the present invention；
Accompanying drawing 2 shows the transmission optimization method of the relay transmission system based on WLAN according to embodiment of the present invention
Flow chart.
Detailed description of the invention
It is more fully described the illustrative embodiments of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the disclosure
Illustrative embodiments, it being understood, however, that may be realized in various forms the disclosure and should be by embodiments set forth herein
Limited.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and can be by the model of the disclosure
Enclose and complete convey to those skilled in the art.
According to the embodiment of the present invention, a kind of relay transmission system based on WLAN proposed, as shown in Figure 1,
Described system includes WLAN reception antenna, WLAN forwarding antenna, optimizes main control unit and WLAN relay process unit；
Described optimization main control unit comprises measurement step-length tuner further, measures coefficient analyser, radiofrequency signal leakage power than calculating
Device, and relay transmission optimization unit；Measure coefficient analyser and farther include extreme value comparator, delay comparator and effectiveness
Discriminator；WLAN relay process unit comprises signal generation unit and signal processing unit further；Signal generation unit enters one
Step include measuring transmitter, smoothing filter, D/A converter, frequency up converters, the first variable gain modulator,
Power amplifier and transmitter；Signal processing unit farther includes receptor, low-noise amplifier, the second variable gain regulation
Device, down-converter, A/D converter, matched filtering device, digital correlator, averager and comparator.
According to the embodiment of the present invention, described optimization main control unit is connected by general purpose I/O with WLAN relay process unit
Connecing, WLAN relay process unit is connected with WLAN forwarding antenna and WLAN reception antenna；Optimize the main control unit cycle
Property by radiofrequency signal leakage power than measure parameter be sent to WLAN relay process unit；WLAN relay process unit root
Generate transmission signal according to the radiofrequency signal leakage power received than measuring parameter, transmission signal is entered by WLAN forwarding antenna
Row sends；Send signal and reach WLAN reception antenna through radio frequency loss channel, formed and receive signal；At WLAN relaying
Reason unit passes through WLAN reception antenna and receives signal, and carries out than measuring the parameter docking collection of letters number according to radiofrequency signal leakage power
Process, generate and measure intermediate parameters, and be sent to optimize main control unit；Optimize main control unit and utilize ginseng in the middle of the measurement received
Number generates radiofrequency signal leakage power and compares measurement result.
According to the embodiment of the present invention, described measurement step-length tuner using sequence repetition number N and pendulous frequency C as penetrating
Frequently signal leakage power initializes than measuring parameter；This measurement step-length tuner is receiving described radiofrequency signal leakage power ratio
After measurement instruction, initialized described sequence repetition number N is sent respectively to measuring transmitter and averager, and with solid
Determine interval to continuously transmit C time；After this measurement step-length tuner once receives the parameter adjustment message that effectiveness discriminator sends, then
Increase sequence repetition number N, and will increase after sequence repetition number N be sent respectively to measuring transmitter and averager,
And continuously transmit C time with fixed interval；Pendulous frequency C is sent respectively to extreme value comparator and delay by this measurement step-length tuner
Comparator；
Described measuring transmitter generates the measurement pilot frequency sequence of a length of N*L according to described sequence repetition number N, should
Sequence, with L as cycle, repeats n times, N and L is natural number, and N ＞ 1；
The measurement pilot frequency sequence that measuring transmitter is formed by described smoothing filter processes, and forms smooth numeral letter
Number；
The digital signal that smoothing filter is formed is converted to base-band analog signal by described D/A converter；
The base-band analog signal that D/A converter is formed is up-converted to frequency band analogue signal by described frequency up converters；
Described first variable gain modulator realizes sending the Continual Gain Actuator of signal and is automatically adjusted；
Described power amplifier carries out power amplification and forms transmission signal the signal after performing gain-adjusted；
The described transmission signal that power amplifier is formed by described transmitter is sent to WLAN forwarding antenna；
Described receptor receives the described reception signal from WLAN reception antenna, and is sent to low by described reception signal
Noise amplifier；
Described low-noise amplifier reduces the out-of-band noise of described reception signal, amplifies inband signaling；
Second variable gain modulator realizes receiving the Continual Gain Actuator of signal and is automatically adjusted；
Signal after gain-adjusted is down-converted to base-band analog signal from frequency band analogue signal by described down-converter；
The base-band analog signal that down-converter is formed is converted to digital signal by described A/D converter；
Described matched filtering device is corresponding with smoothing filter, is converted to a length of by the digital signal that A/D converter is formed
The Serial No. of N*L；
The Serial No. that matched filtering device is formed by described digital correlator carries out correlation computations, generates the relevant of a length of N*L
Value sequence；
Digital correlator formation is correlated with by described averager according to the described sequence repetition number N measuring the transmission of step-length tuner
Value sequence carries out N-1 time with L for the cycle and adds up, and forms the accumulated value sequence of a length of L；
The value of L element in the accumulated value sequence that averager is formed by described comparator compares, and obtains accumulated value extreme value
And extreme value place；Described accumulated value extreme value is sent to extreme value comparator, described extreme value place is sent to delay comparator；
Described extreme value comparator calculates the variance of C the accumulated value extreme value continuously received, and enters with default extreme value variance thresholding
Row compares, and result of the comparison is sent to effectiveness discriminator；
Described delay comparator calculates the variance of C extreme value place continuously received, and with default extreme value place variance thresholding
Compare, and result of the comparison is sent to effectiveness discriminator；
Result and the result of delay comparator transmission that described extreme value comparator is sent by described effectiveness discriminator judge；
If described accumulated value extreme value variance is more than described default extreme value variance thresholding, or extreme value place variance is more than described default pole
Value position variance thresholding, then effectiveness discriminator sends described parameter adjustment message to measuring step-length tuner；Otherwise, effectiveness
Discriminator sends the average of described C accumulated value extreme value to radiofrequency signal leakage power than computer；
Described radiofrequency signal leakage power than computer according to the mean value computation radiofrequency signal of described C the accumulated value extreme value received
Leakage power ratio, and result of calculation is sent to relay transmission optimization unit as described radiofrequency signal leakage power than measurement result.
According to the embodiment of the present invention, described digital correlator is made up of multiple time delay elements and multiple adder, specifically wraps
Including: input signal is divided into two-way, the first time delay elements is sent on a road, is respectively fed to first and adds after 128 clock cycle of time delay
Musical instruments used in a Buddhist or Taoist mass and second adder, another road is directly sent to first adder and second adder；At first adder by two paths of signals phase
Add, at second adder, two paths of signals is subtracted each other；
The second time delay elements is sent in the output of first adder, is respectively fed to the 3rd adder after 64 clock cycle of time delay
With the 4th adder；The output of second adder is sent directly into the 3rd adder and the 4th adder respectively；Will in the 3rd adder
Two paths of signals is added, and is subtracted each other by two paths of signals in the 4th adder；
The 3rd time delay elements is sent in the output of the 3rd adder, is respectively fed to fifth adder after 16 clock cycle of time delay
With the 6th adder；The output of the 4th adder is sent directly into fifth adder and the 6th adder respectively；Will in fifth adder
Two paths of signals subtracts each other, and is added by two paths of signals in the 6th adder；
The 4th time delay elements is sent in the output of fifth adder, sends into the 7th adder after 32 clock cycle of time delay；The
The output of six adders is directly sent to the 7th adder, is subtracted each other by two paths of signals in the 7th adder；
The output of the 7th adder is divided into two-way: the 5th time delay elements is sent on a road, send respectively after 8 clock cycle of time delay
Entering the 8th adder and the 9th adder, another road is sent directly into the 8th adder and the 9th adder；In the 9th adder by two
Road signal is added, and is subtracted each other by two paths of signals in the 8th adder；
The 6th time delay elements is sent in the output of the 9th adder, sends into the tenth adder after 1 clock cycle of time delay；8th
The output of adder is sent directly into the tenth adder, is subtracted each other by two paths of signals in the tenth adder；
The output of the tenth adder is divided into two-way: the 7th time delay elements is sent on a road, send respectively after 4 clock cycle of time delay
Entering the 11st adder and the 12nd adder, another road is sent directly into the 11st adder and the 12nd adder；The tenth
Two paths of signals is added by one adder, is subtracted each other by two paths of signals the 12nd adder；
The 8th time delay elements is sent in the output of the 11st adder, sends into the 13rd adder after 2 clock cycle of time delay；
The output of the 12nd adder is sent directly into the 13rd adder, is subtracted each other by two paths of signals in the 13rd adder, is mated
Wave filter finally export result.
According to the embodiment of the present invention, the transmission optimization method of described relay transmission system based on WLAN is specifically wrapped
Include, as shown in Figure 2:
S1, relay transmission optimize unit and obtain the radiofrequency signal leakage power ratio of trunking；
S2, this radiofrequency signal leakage power ratio is compared with system gain, if radiofrequency signal leakage power ratio ＞
One threshold value, then judge that radiofrequency signal leakage power ratio is good, perform step S3；If Second Threshold≤radiofrequency signal leakage power ratio
Value≤first threshold, then judge that radiofrequency signal leakage power ratio is general, perform step S6；If radiofrequency signal leakage power ratio ＜
Second Threshold, then judge radiofrequency signal leakage power ratio, it is impossible to communicate；
The actual gain of S3, order reception and conversion link is theoretical gain, performs step S4；
S4, judge the scope of starting to control of automatic growth control whether more than 0dB, if more than 0dB, then regulation radio frequency loss to from
The scope of starting to control of dynamic gain control is 0dB；
Whether S5, the output of detecting system are full power output, make system reach if it has not, then reduce link gain value
Full power exports, if being unable to reach full power output, then reduces the yield value of link to 0dB；
S6, order receive and the actual gain=radiofrequency signal leakage power ratio-gain adjustment value of conversion link, perform step S7；
S7, on the basis of the actual gain of this reception and conversion link, it is judged that whether the scope of starting to control of automatic growth control is more than
0dB, if more than 0dB, then regulation radio frequency loss is 0dB to the scope of starting to control of automatic growth control, performs step S8；
Whether S8, the output of detecting system are full power output, make system reach if it has not, then reduce link gain value
Full power exports, if being unable to reach full power output, then reduces the yield value of link and to the reception obtained in step S6 and forwards chain
The actual gain on road.
According to the preferred embodiment of the present invention, described first threshold is set to system gain+5dB, and described Second Threshold is arranged
For system gain-20dB.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, and appoints
How those familiar with the art is in the technical scope that the invention discloses, the change that can readily occur in or replacement are all answered
Contain within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (4)
1. a relay transmission system based on WLAN, described system include WLAN reception antenna, WLAN forwarding antenna,
Optimize main control unit and WLAN relay process unit；Described optimization main control unit comprises measurement step-length tuner, measurement further
Coefficient analyser, radiofrequency signal leakage power are than computer, and relay transmission optimizes unit；Measurement coefficient analyser is further
Including extreme value comparator, delay comparator and effectiveness discriminator；WLAN relay process unit comprises signal further and produces single
Unit and signal processing unit；Measuring transmitter that signal generation unit farther includes to be sequentially connected with, smoothing filter, D/A
Transducer, frequency up converters, the first variable gain modulator, power amplifier and transmitter, the output of described transmitter is even
Connecing WLAN forwarding antenna, the input of described measuring transmitter connects measures step-length tuner；Described signal processing unit enters
One step includes that the receptor being sequentially connected with, low-noise amplifier, the second variable gain modulator, down-converter, A/D turn
Parallel operation, matched filtering device, digital correlator, averager and comparator, the input of described receptor connects WLAN reception antenna,
The output of described comparator connects measures coefficient analyser, and the output of described measurement coefficient analyser connects measurement step-length tuning respectively
Device and radiofrequency signal leakage power connect relay transmission optimization than computer, described radiofrequency signal leakage power than the output of computer
Unit, and the output of described measurement step-length tuner is also connected with described averager；
Wherein, described optimization main control unit is connected by general purpose I/O with WLAN relay process unit, WLAN relay process unit
It is connected with WLAN forwarding antenna and WLAN reception antenna；Optimize main control unit periodically by radiofrequency signal leakage power
It is sent to WLAN relay process unit than measuring parameter；WLAN relay process unit is revealed according to the radiofrequency signal received
Power generates transmission signal than measuring parameter, is transmitted by WLAN forwarding antenna by transmission signal；Send signal through penetrating
Frequency loss channel reaches WLAN reception antenna, is formed and receives signal；WLAN relay process unit receives sky by WLAN
Line receives signal, and processes than the measurement parameter docking collection of letters number according to radiofrequency signal leakage power, generates and measures intermediate parameters,
And be sent to optimize main control unit；Optimizing main control unit utilizes the measurement intermediate parameters received to generate radiofrequency signal leakage power ratio
Measurement result.
2. a system as claimed in claim 1, described measurement step-length tuner using sequence repetition number N and pendulous frequency C as
Radiofrequency signal leakage power initializes than measuring parameter；This measurement step-length tuner is receiving described radiofrequency signal leakage power
After measurement instruction, initialized described sequence repetition number N is sent respectively to measuring transmitter and averager, and with
Fixed interval continuously transmit C time；After this measurement step-length tuner once receives the parameter adjustment message that effectiveness discriminator sends,
Then increase sequence repetition number N, and will increase after sequence repetition number N be sent respectively to measuring transmitter and averager,
And continuously transmit C time with fixed interval；Pendulous frequency C is sent respectively to extreme value comparator and delay by this measurement step-length tuner
Comparator；
Described measuring transmitter generates the measurement pilot frequency sequence of a length of N*L according to described sequence repetition number N, and this sequence is with L
For the cycle, repeating n times, N and L is natural number, and N ＞ 1；
The measurement pilot frequency sequence that measuring transmitter is formed by described smoothing filter processes, and forms smooth digital signal；
The digital signal that smoothing filter is formed is converted to base-band analog signal by described D/A converter；
The base-band analog signal that D/A converter is formed is up-converted to frequency band analogue signal by described frequency up converters；
Described first variable gain modulator realizes sending the Continual Gain Actuator of signal and is automatically adjusted；
Described power amplifier carries out power amplification and forms transmission signal the signal after performing gain-adjusted；
The described transmission signal that power amplifier is formed by described transmitter is sent to WLAN forwarding antenna；
Described receptor receives the described reception signal from WLAN reception antenna, and described reception signal is sent to low noise amplification
Device；
Described low-noise amplifier reduces the out-of-band noise of described reception signal, amplifies inband signaling；
Second variable gain modulator realizes receiving the Continual Gain Actuator of signal and is automatically adjusted；
Signal after gain-adjusted is down-converted to base-band analog signal from frequency band analogue signal by described down-converter；
The base-band analog signal that down-converter is formed is converted to digital signal by described A/D converter；
Described matched filtering device is corresponding with smoothing filter, and the digital signal that A/D converter is formed is converted to the number of a length of N*L
Word sequence；
The Serial No. that matched filtering device is formed by described digital correlator carries out correlation computations, generates the sequence of correlation values of a length of N*L；
The sequence of correlation values that digital correlator is formed by described averager according to the described sequence repetition number N measuring the transmission of step-length tuner
Carry out N-1 time with L for the cycle to add up, form the accumulated value sequence of a length of L；
The value of L element in the accumulated value sequence that averager is formed by described comparator compares, and obtains accumulated value extreme value and extreme value
Position；Described accumulated value extreme value is sent to extreme value comparator, described extreme value place is sent to delay comparator；
Described extreme value comparator calculates the variance of C the accumulated value extreme value continuously received, and compares with default extreme value variance thresholding,
And result of the comparison is sent to effectiveness discriminator；
Described delay comparator calculates the variance of C the extreme value place continuously received, and compares with default extreme value place variance thresholding
Relatively, and by result of the comparison effectiveness discriminator it is sent to；
Result and the result of delay comparator transmission that described extreme value comparator is sent by described effectiveness discriminator judge；If institute
State accumulated value extreme value variance and be more than described default extreme value variance thresholding, or extreme value place variance is more than described default extreme value place
Variance thresholding, then effectiveness discriminator sends described parameter adjustment message to measuring step-length tuner；Otherwise, effectiveness discriminator
Send the average of described C accumulated value extreme value than computer to radiofrequency signal leakage power；
Described radiofrequency signal leakage power reveals merit than computer according to the mean value computation radiofrequency signal of described C the accumulated value extreme value received
Rate ratio, and result of calculation is sent to relay transmission optimization unit as described radiofrequency signal leakage power than measurement result.
3. a system as claimed in claim 2, described digital correlator is made up of, specifically multiple time delay elements and multiple adder
Including: input signal is divided into two-way, and the first time delay elements is sent on a road, is respectively fed to first after 128 clock cycle of time delay
Adder and second adder, another road is directly sent to first adder and second adder；At first adder by two paths of signals
It is added, at second adder, two paths of signals is subtracted each other；
The second time delay elements is sent in the output of first adder, is respectively fed to the 3rd adder and the 4th and adds after 64 clock cycle of time delay
Musical instruments used in a Buddhist or Taoist mass；The output of second adder is sent directly into the 3rd adder and the 4th adder respectively；In the 3rd adder by two paths of signals
It is added, in the 4th adder, two paths of signals is subtracted each other；
The 3rd time delay elements is sent in the output of the 3rd adder, is respectively fed to fifth adder and the 6th and adds after 16 clock cycle of time delay
Musical instruments used in a Buddhist or Taoist mass；The output of the 4th adder is sent directly into fifth adder and the 6th adder respectively；In fifth adder by two paths of signals
Subtract each other, in the 6th adder, two paths of signals is added；
The 4th time delay elements is sent in the output of fifth adder, sends into the 7th adder after 32 clock cycle of time delay；6th adder
Output be directly sent to the 7th adder, in the 7th adder, two paths of signals is subtracted each other；
The output of the 7th adder is divided into two-way: the 5th time delay elements is sent on a road, is respectively fed to the 8th after 8 clock cycle of time delay
Adder and the 9th adder, another road is sent directly into the 8th adder and the 9th adder；In the 9th adder by two paths of signals
It is added, in the 8th adder, two paths of signals is subtracted each other；
The 6th time delay elements is sent in the output of the 9th adder, sends into the tenth adder after 1 clock cycle of time delay；8th adder
Output is sent directly into the tenth adder, is subtracted each other by two paths of signals in the tenth adder；
The output of the tenth adder is divided into two-way: the 7th time delay elements is sent on a road, is respectively fed to the tenth after 4 clock cycle of time delay
One adder and the 12nd adder, another road is sent directly into the 11st adder and the 12nd adder；At the 11st addition
Two paths of signals is added by device, is subtracted each other by two paths of signals the 12nd adder；
The 8th time delay elements is sent in the output of the 11st adder, sends into the 13rd adder after 2 clock cycle of time delay；12nd
The output of adder is sent directly into the 13rd adder, is subtracted each other by two paths of signals in the 13rd adder, obtains matched filtering device
Finally export result.
4. the side performing transmission optimization such as claim 1-3 relay transmission system based on WLAN as described in one of them
Method, including:
S1, relay transmission optimize unit and obtain the radiofrequency signal leakage power ratio of trunking；
S2, this radiofrequency signal leakage power ratio is compared with system gain, if radiofrequency signal leakage power ratio ＞ first threshold,
Then judge that radiofrequency signal leakage power ratio is good, perform step S3；If Second Threshold≤radiofrequency signal leakage power ratio≤the first
Threshold value, then judge that radiofrequency signal leakage power ratio is general, perform step S6；If radiofrequency signal leakage power ratio ＜ Second Threshold,
Then judge radiofrequency signal leakage power ratio, it is impossible to communicate；
The actual gain of S3, order reception and conversion link is theoretical gain, performs step S4；
S4, judge the scope of starting to control of automatic growth control whether more than 0dB, if more than 0dB, then regulation radio frequency loss is to automatic gain
The scope of starting to control controlled is 0dB；
Whether S5, the output of detecting system are full power output, make system reach full power if it has not, then reduce link gain value
Output, if being unable to reach full power output, then reduces the yield value of link to 0dB；
S6, order receive and the actual gain=radiofrequency signal leakage power ratio-gain adjustment value of conversion link, perform step S7；
S7, on the basis of the actual gain of this reception and conversion link, it is judged that the scope of starting to control of automatic growth control whether more than 0dB,
If more than 0dB, then regulation radio frequency loss is 0dB to the scope of starting to control of automatic growth control, performs step S8；
Whether S8, the output of detecting system are full power output, make system reach full power if it has not, then reduce link gain value
Output, if being unable to reach full power output, then reduces the yield value of link to the reception obtained in step S6 and the reality of conversion link
Border gain.
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| CN104244288A (en) * | 2014-08-26 | 2014-12-24 | 李青花 | WLAN relay optimizing system and method |
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| US9721758B2 (en) * | 2015-07-13 | 2017-08-01 | Mks Instruments, Inc. | Unified RF power delivery single input, multiple output control for continuous and pulse mode operation |
| CN105873086A (en) * | 2016-06-16 | 2016-08-17 | 中国民用航空总局第二研究所 | Airport surface wireless communication system and wireless terminal |
| CN111769864B (en) * | 2020-07-21 | 2022-02-15 | 展讯通信（上海）有限公司 | Relay amplification method and system for wireless signal, and storage medium |
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