CN201188612Y - Closed-loop automatic level control device for TDD mode communication system - Google Patents
Closed-loop automatic level control device for TDD mode communication system Download PDFInfo
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- CN201188612Y CN201188612Y CNU2008200330425U CN200820033042U CN201188612Y CN 201188612 Y CN201188612 Y CN 201188612Y CN U2008200330425 U CNU2008200330425 U CN U2008200330425U CN 200820033042 U CN200820033042 U CN 200820033042U CN 201188612 Y CN201188612 Y CN 201188612Y
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Abstract
A closed loop automatic level control device used for a TTD mode communication system belongs to the field of wireless communication. The closed loop automatic level control device comprises a radio frequency coupler (7), a radio frequency switch (1), a radio frequency attenuator (2), a driving amplifier (3), a power amplifier (4) and a radio frequency coupler (8) which are orderly connected in series. The closed loop automatic level control device is characterized in that the control end of the radio frequency attenuator (2) is connected with a single-chip computer (9) in which a voltage comparator and an analog-digital converter are embedded; the input ends of the radio frequency couplers (7 and 8) are respectively connected with radiodetectors (5 and 6), the radiodetector (5) is connected with the input end of the voltage comparator in the single-chip computer, and signals output by the radiodetector (6) are connected with the input end of the analog-digital converter in the single-chip computer; and the output end of the single-chip computer (9) is also connected with the control end of the radio frequency switch (1). The closed loop automatic level control device has the advantages of small error, high stability and low cost, and can be suitable for TDD signals of various modes.
Description
Technical field
The utility model belongs to wireless communication field, relates in particular to a kind of closed loop automatic electric-level control device that is used for the tdd mode communication system.
Background technology
Fdd mode rules all the land in the first generation and second generation mobile communication system at present, and tdd mode does not draw attention.Because the needs of new business and the development of new technology, and many advantages of tdd mode, tdd mode will come into one's own day by day.Time division duplex (TDD) is a kind of duplex mode of communication system, is used for separating in mobile communication system receiving and transmitting channel.WLAN, WIMAX, tdd mode communication systems such as TD-SCDMA are just in high speed development and application.TDD mainly was that base station equipment realizes the control of closed loop automatic electric-level in the past, and this method needs baseband processing equipment to provide synchronizing signal, detects power output then and gives baseband processing equipment, and such method is very complicated, and needs baseband processing equipment.Some equipment vendors for radio network optimization are difficult to realize that cost is very high.But present WLAN, the WAP (wireless access point) power of WIMAX is generally little, and some equipment vendors of radio network optimization are for expanding the coverage area enhancing signal intensity, have to add two-way amplifier, and this kind equipment needs closed loop automatic level control method and device cheaply.The CDMA2000 of fdd mode in the past, the network optimization equipment of WCDMA standard adopt analog integrator circuit to realize the control of closed loop automatic electric-level, but it can not be used for tdd mode, therefore need new closed loop automatic level control method.
A kind of method and system that is used for TDD communication system automatic gain control (AGC) is disclosed 01819109.6 " be used for the automatic gain control of time division duplex receiver ", wherein each time slot of signal of communication comprises the preamble of a binary phase shift keying (BPSK) form, and it is positioned at the section start of each time slot.Because this preamble allows AGC Fast estimation signal strength signal intensity and adjusts gain in view of the above, thereby improved the channel estimation function of receiver.This has realized the correct reception to all data symbols of following preamble in bursty data, and causes producing a more accurate training sequence channel estimating.It also allows the agc circuit in the TDD receiver to become more simple.
200610037141.6 " TD-SCDMA covering system and digit time slot automatic level control method thereof " discloses TD-SCDMA covering system digit time slot automatic level control method, comprise step: a. detects the radiofrequency signal power of relevant position in the uplink and downlink link, output envelope rectified signal; B. obtain the automatic electric-level control control starting value and the uplink and downlink time slot switching point information of signal; C. produce time slit instruction signal in conjunction with frame synchronization index signal and time slot switching point information; D. sample according to time slit instruction signal output corresponding control information, and to each corresponding envelope detection signal, obtain the power samples value of each time slot of each relevant position; Time slit instruction signal during e. according to the signal uplink and downlink, time slot power sampled value, automatic electric-level control control starting value, the decay controlling value of corresponding each attenuator of generation before each time slot begins.A kind of TD-SCDMA covering system of Applied Digital time slot automatic level control method is also disclosed.
200620157603.3 " the automatic electric-level control device of TD-SCDMA power amplifier " discloses a kind of automatic electric-level control device of TD-SCDMA power amplifier, it is electrically connected by energy detection unit, high speed analog-to-digital conversion AD unit, on-site programmable gate array FPGA unit and gain adjustment unit successively and forms.The processing of various data mainly by the cooperation of high speed analog-to-digital conversion AD unit and on-site programmable gate array FPGA unit, can provide quicker response in the utility model, and the realization automated power that this device can be successful is controlled.
Summary of the invention
The purpose of this utility model is: overcome deficiency of the prior art, propose a kind of closed loop automatic electric-level control device that is used for the tdd mode communication system.
The purpose of this utility model is achieved in that
A kind of closed loop automatic electric-level control device that is used for the tdd mode communication system, the radio-frequency (RF) coupler 7, radio-frequency (RF) switch 1, radio frequency attenuator 2, driving amplifier 3, power amplifier 4 and the radio-frequency (RF) coupler 8 that comprise order series connection successively is characterized in that the control end of described radio frequency attenuator 2 connects the single-chip microcomputer 9 that is embedded with comparator and analog to digital converter; The output of radio-frequency (RF) coupler 7 connects first detector 5, and the output of radio-frequency (RF) coupler 8 connects second detector 6; First detector 5 connects the input of voltage comparator in the single-chip microcomputer, and the signal of second detector 6 outputs connects the input of analog to digital converter in the single-chip microcomputer; The output of single-chip microcomputer 9 also connects the control end of radio-frequency (RF) switch 1.
First detector 5 output input signal envelopes produce synchronizing signal in the back for the voltage comparator of single-chip microcomputer and the level ratio of setting, and first detector 5 is selected logarithmic detector for use, and the logarithmic detector real-time is good, and the synchronizing signal time-delay of generation is little.Single-chip microcomputer is in the output signal of downlink working time sampling second detector 6, compare with the level value of setting, produce the signal of control radio frequency attenuator 2 through algorithm in the single-chip microcomputer, make the output of power amplifier remain on the level of setting through after certain circulation, error is less than 0.5dB, second detector 6 adopts average detector, average detector is little to the value error of the signal sampling of different peak-to-average force ratios, so just can make WLAN, different modulating mode signals such as WIMAX can both be controlled on the level value of setting, and error is little.
This device selects single-chip microcomputer (comprising voltage comparator, modulus converter A/D) to realize the control of closed loop automatic electric-level, and its cost is low, and use software to come implementation algorithm, its precision height, easy to control stable, and the convenient delay parameter of revising is to reach fast or closed loop at a slow speed.
The advantage of this device is:
This device can be used for the WLAN two-way amplifier, the WIMAX two-way amplifier, and TD-SCDMA is dried to be put, the closed loop automatic electric-level control of equipment such as TD-SCDMA repeater.
1, the error of closed loop automatic electric-level control is less than 0.5dB and stable.
2, the device that only needs to adjust the parameter of algorithm in the single-chip microcomputer and select different frequency range for use just can be suitable for the TDD signal of different mode.
3, tdd mode radio network optimization equipment does not need baseband processing equipment directly according to the analog signal detection, just can realize the control of closed loop automatic electric-level with single-chip microcomputer, and cost is low.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention
Radio-frequency (RF) switch 1, radio frequency attenuator 2, driving amplifier 3, power amplifier 4, first detector 5, second detector 6, radio-frequency (RF) coupler 7, radio-frequency (RF) coupler 8, single-chip microcomputer 9.
Fig. 2 is example 1 electrical schematic diagram of the present invention
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
The closed loop automatic electric-level control device that is used for the tdd mode communication system, the radio-frequency (RF) coupler 7, radio-frequency (RF) switch 1, radio frequency attenuator 2, driving amplifier 3, power amplifier 4 and the radio-frequency (RF) coupler 8 that comprise order series connection successively is characterized in that the control end of described radio frequency attenuator 2 connects the single-chip microcomputer 9 that is embedded with voltage comparator and analog to digital converter; The output of radio-frequency (RF) coupler 7 connects first detector 5, and the output of radio-frequency (RF) coupler 8 connects second detector 6; First detector 5 connects the input of voltage comparator in the single-chip microcomputer, and the signal of second detector 6 outputs connects the input of analog to digital converter in the single-chip microcomputer; The output of single-chip microcomputer 9 also connects the control end of radio-frequency (RF) switch 1.
First detector 5 output input signal envelopes produce synchronizing signal in the back for the voltage comparator of single-chip microcomputer and the level ratio of setting, and first detector 5 is selected logarithmic detector for use, and the logarithmic detector real-time is good, and the synchronizing signal time-delay of generation is little.Single-chip microcomputer is in the output signal of downlink working time sampling second detector 6, compare with the level value of setting, produce the signal of control radio frequency attenuator 2 through algorithm in the single-chip microcomputer, make the output of power amplifier remain on the level of setting through after certain circulation, error is less than 0.5dB, second detector 6 adopts average detector, average detector is little to the value error of the signal sampling of different peak-to-average force ratios, so just can make WLAN, different modulating mode signals such as WIMAX can both be controlled on the level value of setting, and error is little.
First detector 5 detects input signals earlier, extracts that signal envelope is given voltage comparator in the single-chip microcomputer and the magnitude of voltage set relatively draws the synchronizing signal sequential; Detect output signal level by second detector 6 again and give analog to digital converter in the single-chip microcomputer; Analog to digital converter sampling output rectified signal is judged downlink signal levels in the single-chip microcomputer; Control the state of radio frequency attenuator in the link by single-chip microcomputer then and realize stable closed loop automatic electric-level control;
Example 1 is used for the closed loop automatic electric-level control of 2.4GHz WLAN two-way amplifier down link, and control is output as the optional following device of 0.5W:
Radio-frequency (RF) switch 1: the AS169-73 of optional Skyworks
Numerical control radio frequency attenuator 2: the HMC306 of optional Hittite
Driving amplifier 3: the AH1 of optional WJ
Power amplifier 4: the FLU35ZM of optional Fujitsu
Wave detector 5: the MAX4003EUA of optional Maxim
Wave detector 6: the ADL5501 of optional ADI
Radio-frequency (RF) coupler 7: optional microstrip coupler
Radio-frequency (RF) coupler 8: optional microstrip coupler
Single-chip microcomputer (comprising voltage comparator, modulus converter A/D) 9: the PIC16F88 example 2 of optional Microchip, be used for the closed loop automatic electric-level control of 2.5GHz WIMAX two-way amplifier down link, control is output as 1W.
Optional following device:
Radio-frequency (RF) switch 1: the AS169-73 of optional Skyworks
Numerical control radio frequency attenuator 2: the HMC306 of optional Hittite
Driving amplifier 3: the ASX423 of optional ASB
Power amplifier 4: the FLL120MK of optional Fujitsu
Wave detector 5: the MAX4003EUA of optional Maxim
Wave detector 6: the ADL5501 of optional ADI
Radio-frequency (RF) coupler 7: optional microstrip coupler
Radio-frequency (RF) coupler 8: optional microstrip coupler
Single-chip microcomputer (comprising voltage comparator, modulus converter A/D) 9: the PIC16F88 of optional Microchip
Claims (3)
1, a kind of closed loop automatic electric-level control device that is used for the tdd mode communication system, it is characterized in that comprising radio-frequency (RF) coupler (7), radio-frequency (RF) switch (1), radio frequency attenuator (2), driving amplifier (3), power amplifier (4) and the radio-frequency (RF) coupler (8) of order series connection successively, the control end of described radio frequency attenuator (2) connects the single-chip microcomputer (9) that is embedded with voltage comparator and analog to digital converter; The output of radio-frequency (RF) coupler (7) connects first detector (5), and the output of radio-frequency (RF) coupler (8) connects second detector (6); First detector (5) connects the input of voltage comparator in the single-chip microcomputer, and the signal of second detector (6) output connects the input of analog to digital converter in the single-chip microcomputer; The output of single-chip microcomputer (9) also connects the control end of radio-frequency (RF) switch (1).
2, the closed loop automatic electric-level control device that is used for the tdd mode communication system according to claim 1 is characterized in that described first detector (5) is a logarithmic detector; Described first detector (6) is an average detector.
3, the closed loop automatic electric-level control device that is used for the tdd mode communication system according to claim 1 and 2 is characterized in that described radio frequency attenuator (2) is the radio frequency numerical-control attenuator.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200330425U CN201188612Y (en) | 2008-03-19 | 2008-03-19 | Closed-loop automatic level control device for TDD mode communication system |
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| CNU2008200330425U CN201188612Y (en) | 2008-03-19 | 2008-03-19 | Closed-loop automatic level control device for TDD mode communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710338A (en) * | 2012-05-31 | 2012-10-03 | 福建三元达通讯股份有限公司 | Method for realizing automatic gain compensation of simulative optic-fiber repeater according to light detection |
| CN106603168A (en) * | 2016-11-14 | 2017-04-26 | 南京熊猫电子股份有限公司 | Transmitter ALC design universal test platform and test method |
-
2008
- 2008-03-19 CN CNU2008200330425U patent/CN201188612Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710338A (en) * | 2012-05-31 | 2012-10-03 | 福建三元达通讯股份有限公司 | Method for realizing automatic gain compensation of simulative optic-fiber repeater according to light detection |
| CN106603168A (en) * | 2016-11-14 | 2017-04-26 | 南京熊猫电子股份有限公司 | Transmitter ALC design universal test platform and test method |
| CN106603168B (en) * | 2016-11-14 | 2020-09-22 | 南京熊猫电子股份有限公司 | Transmitter ALC design universal test platform and test method |
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Granted publication date: 20090128 Termination date: 20150319 |
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