CN1889391A - Time division synchronous code division multiple access covering system - Google Patents
Time division synchronous code division multiple access covering system Download PDFInfo
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- CN1889391A CN1889391A CNA2006100365218A CN200610036521A CN1889391A CN 1889391 A CN1889391 A CN 1889391A CN A2006100365218 A CNA2006100365218 A CN A2006100365218A CN 200610036521 A CN200610036521 A CN 200610036521A CN 1889391 A CN1889391 A CN 1889391A
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Abstract
This invented TD-CDMA cover system includes a coupler, a near end switch circuit, a far end switch circuit,an up amplifying circuit, a down amplifying circuit and a synchronous module, in which, said synchronous module is composed of a RF receiver and a baseband process sub-module and digitalizes the received TD-SCDMA signals to get frame synchronous information and outputs the control signals to the near end switch circuit, the far end switch circuit, the up-link amplifying circuit and the down link amplifying circuit to control its on-off state, when the base station signal is the down time slot, it controls the off of the up link and the on of the down link, or the off of the down link and the on of the up link.
Description
[technical field]
The present invention relates to moving communicating field, relate in particular to a kind of time division synchronous code division multiple access covering system.
[background technology]
Fast development along with China's mobile communication cause, the 2nd present generation or 2.5 third-generation mobile communication systems are at the great demand that all can not satisfy society aspect capacity and the professional ability, and therefore the 2nd generation or 2.5 third-generation mobile communication systems will be replaced by the third generation (3G) mobile communication system.In order progressively to be evolved into third generation network neatly on the basis of second generation network, 3G has three communication standard: WCDMA, cdma2000, TD-SCDMA.TD-SCDMA (Time Division-Synchronous CodeDivision Multiple Access, TD SDMA, abbreviation TD-SCDMA) technology is proposed by China and formally became the 3G (Third Generation) Moblie international standard in 2000, and the system that follows this standard development has the very high availability of frequency spectrum and lower cost.
As the key player who is played the part of in second generation mobile communication covers, covering systems such as repeater will play important effect in 3-G (Generation Three mobile communication system).Because TD-SCDMA has special physical channel structure, can be according to the needs of business, change the time slot switching point neatly, satisfy the needs of up-downgoing non-symmetrical service, therefore, time synchronized plays a very important role to the TD-SCDMA tool, especially needs to realize the accurate switching of uplink and downlink timeslot as the TD-SCDMA covering system of trunking, amplifies and forwarding capability so that finish seamless signal.
[summary of the invention]
The object of the present invention is to provide a kind of time division synchronous code division multiple access covering system, this covering system can be realized the switching of uplink and downlink timeslot accurately and stably under the lower-cost prerequisite of maintenance, finishes seamless amplification and forwarding capability to the TD-SCDMA signal.
The objective of the invention is to be achieved through the following technical solutions:
This time division synchronous code division multiple access covering system comprises coupler, near-end built-up circuit, far-end built-up circuit, up amplifying circuit, descending amplifying circuit and Monitor And Control Subsystem;
Described near-end built-up circuit, descending amplifying circuit, the far-end built-up circuit electrically connects the formation down link successively; Described far-end built-up circuit, up amplifying circuit, the near-end built-up circuit electrically connects the formation up link successively;
Described near-end built-up circuit is forwarded to the input port of descending amplifying circuit with base station signal, and up output signal is forwarded to the base station; Described far-end built-up circuit is forwarded to the input port of up amplifying circuit with upward signal, and descending output signal is forwarded to far-end;
The base station signal that comes through near-end built-up circuit transmission is carried out descending amplification with descending amplifying circuit after the far-end built-up circuit transfers to far-end covers; Up amplifying circuit amplifies after the near-end built-up circuit transfers to the base station the upward signal that comes through the transmission of far-end built-up circuit;
Monitor And Control Subsystem is monitored the various states of covering system, can the teletransmission state information give Surveillance center, and can accept various parameter settings;
In addition, set up synchronization module, its output connects up link and down link respectively;
The output of described coupler connects the input port of synchronization module, coupler carries out after the signal coupling signal being transferred to synchronization module in the down link somewhere, synchronization module will be handled the back by the base station information that the coupler transmission comes and obtain frame synchronization information, output control signals to uplink downlink to control its break-make according to this frame synchronization information, when base station signal is descending time slot, then control down link and open, up link is closed; Otherwise, then to control up link and open, down link is closed.
Described synchronization module comprises radio-frequency transmitter and Base-Band Processing submodule, the input of radio-frequency transmitter is done to be connected with coupler with the input of synchronization module, its output is connected with the input of Base-Band Processing submodule, and the output of Base-Band Processing submodule connects down link as the output of synchronization module;
Radio-frequency transmitter will demodulate the Analog Baseband i/q signal from the TD-SCDMA signal of described coupler input; The Base-Band Processing submodule carries out obtaining after the Digital Signal Processing frame synchronization to the TD-SCDMA signal to the Analog Baseband i/q signal of radio-frequency transmitter input, and output control signal control covering system carries out the switching of uplink and downlink link, when base station signal is descending time slot, control then that up link is closed, down link is opened; Otherwise, control then that down link closes, up link is opened.
Described coupler is positioned at the optional position of down link, and the base station signal of proper strength is provided to synchronization module by the adjustment of the degree of coupling.
Described descending amplifying circuit and up amplifying circuit can be by LNA, frequency-selecting, and the power amplifier three forms, and also can be made up of a part wherein, and its characteristics are to finish enlarging function, can carry out opening and closing according to the control signal that synchronization module transmits simultaneously.
When described radio-frequency transmitter is converted to baseband I/Q signal with base station signal, can adopts the Direct Conversion mode or adopt repeatedly frequency conversion mode.
Described Base-Band Processing submodule comprises A/D sample circuit, Finite Impulse Response filter, base band detection module, synchronous searching module, synchronized result authentication module, control signal generating module, control signal driver module, MCU minimum system, AGC module and PLL configuration module;
The A/D sample circuit is finished the analog-to-digital conversion of baseband I/Q signal, and its input is connected with the output of radio-frequency transmitter, and its output is connected with the input of Finite Impulse Response filter;
Finite Impulse Response filter carries out filtering with digitized baseband I/Q signal, and its output is connected with the input of base band detection module;
The base band detection module will extract from the signal that the transmission of FIR filter comes and be used for synchronous baseband envelope rectified signal, and its output is connected with the input of synchronous searching module with the AGC module respectively;
The synchronous searching module is carried out the search differentiation of down-going synchronous to the baseband envelope rectified signal of base band detection module input according to the envelope characteristic of the GP time slot on descending synchronous code time slot and both sides thereof, find out the position of downlink synchronous code of TD-SCDMA signal, its output is connected with the input of synchronized result authentication module;
The synchronized result authentication module verifies that to the synchronous indicating signal of synchronous searching module input its output is connected with the input of base band detection module, synchronous searching module, control signal generating module, MCU minimum system, AGC module and PLL configuration module respectively;
Control signal generating module produces switch-over control signal according to the synchronous control signal of synchronized result authentication module input and the uplink and downlink switching point information of MCU minimum system input, and its output is connected with the input of control signal driver module;
The MCU minimum system receives the information of Monitor And Control Subsystem, work carrier frequency point and link ATT by PLL configuration module and AGC block configuration radio-frequency transmitter are provided with, obtain the uplink and downlink switching point signal of TD-SCDMA, its output is connected with the input of AGC module and PLL configuration module;
The AGC module is connected with the input of radio-frequency transmitter with the output of PLL configuration module, the AGC module is according to the ATT controlling value of the envelope intensity adjustment output of input, thereby adjust the link ATT of radio-frequency transmitter, make the signal strength signal intensity of radio-frequency transmitter output remain on suitable scope;
The control signal driver module is converted to the needed level signal of system with the switch-over control signal of control signal generating module input, and switch, far end radio frequency switch, low noise amplifier and power amplifier are connected its output frequently with described end-fire respectively.
Described radio-frequency transmitter and Base-Band Processing submodule can carry out automatic searching carrier frequency and automatically adjust the ATT configuration, also can work carrier frequency and ATT configuration be set by the manual configuration information that the MCU minimum system receives the Monitor And Control Subsystem of covering system.When carrying out automatic searching carrier frequency and adjusting the ATT configuration automatically, PLL configuration module and AGC module are according to the synchronous mark signal of synchronized result authentication module output, dispose the work carrier frequency point of radio-frequency transmitter and link ATT one by one and be provided with, reach till synchronously until system.
Described base band detection module is extracted the detailed process that is used for synchronous baseband envelope rectified signal:
(1) the filtered two-way baseband I/Q signal of digital FIR carries out the I*I+Q*Q computing, obtains the energy envelope signal of TD-SCDMA signal;
(2) the energy envelope signal that is obtained is carried out thresholding and differentiate, be higher than thresholding and be judged to 1, be lower than thresholding and be judged to 0, thereby obtain to be used for synchronous baseband envelope rectified signal.
(3) thresholding that is used to differentiate can be adjusted automatically, and initial value is a higher value, carries out real-time self adaptation according to the synchronous mark signal of synchronized result authentication module feedback and progressively reduces adjustment, reaches till synchronously until system.
The level signal that described control signal driver module is produced can be differential signal or CMOS level signal.
Described Finite Impulse Response filter, base band detection module, synchronous searching module, synchronized result authentication module, control signal generating module realize in FPGA, CPLD or EPLD chip.
Described AGC module and PLL configuration module can be realized in FPGA, CPLD or EPLD chip, also can realize in the MCU minimum system.
The value of the link ATT of the switching point that described Monitor And Control Subsystem switches by 485 interface configuration synchronization module up-downgoings and the sync carrier frequency of configuration synchronization module and radio-frequency transmitter, and realize the software remote update.
When covering system was broken down into relay and capped end, then described relay and capped end should be provided with described synchronization module simultaneously.
Compared with prior art, the present invention possesses following advantage: owing to adopted described synchronization module, this module has adopted comparatively advanced person's method of synchronization efficiently, and can utilize chip realizations such as FPGA, thereby can be at the net synchronization capability that keeps providing under the lower-cost prerequisite superior performance, make the TD-SCDMA covering system can realize the switching of uplink and downlink timeslot accurately and stably, finish seamless signal and amplify and forwarding capability.
[description of drawings]
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the theory diagram of synchronization module among the present invention;
Fig. 3 a, 3b are the structural representation of second embodiment of the invention;
Fig. 4 is the theory diagram of third embodiment of the invention;
The schematic diagram of the switch-over control signal of the uplink and downlink timeslot that Fig. 5 is provided for detection module among the present invention.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
The invention discloses a kind of time division synchronous code division multiple access covering system that adopts the detection frame synchornization method.This system adopts the detection synchro system as the nucleus module that TD-SCDMA covers, and utilizes the corresponding signal process technology, realizes the frame synchronization to the TD-SCDMA signal.Control corresponding mains switch at the corresponding switching point of TD-SCDMA signal and switch, thereby between up-downgoing, switch.
The theory diagram of time division synchronous code division multiple access covering system of the present invention as shown in Figure 1.Described covering system (is made up of LNA, frequency-selecting, power amplifier coupler 101, near-end built-up circuit 102, descending amplifying circuit, also can form by a part wherein) 103, far-end built-up circuit 104, up amplifying circuit (be made up of LNA, frequency-selecting, power amplifier, also can be made up of a part wherein) 105, radio-frequency transmitter 106, Base-Band Processing submodule 107 and Monitor And Control Subsystem 108 constitute.Described near-end built-up circuit 102, coupler 101, descending amplifying circuit 103, far-end built-up circuit 104 electrically connect successively and constitute down link; Described far-end built-up circuit 104, up amplifying circuit 105,102 of near-end built-up circuits electrically connect successively and constitute up link.
This repeater covering system is exported to radio-frequency transmitter 106 with the TD-SCDMA downstream signal of base station after coupler 101 is handled; The TD-SCDMA radiofrequency signal of 106 pairs of inputs of radio-frequency transmitter carries out obtaining baseband analog I/Q two paths of signals after the demodulation, and with the two-way baseband analog i/q signal input Base-Band Processing submodule 107 that obtains; 107 pairs of TD-SCDMA baseband analog of Base-Band Processing submodule i/q signal carries out digital signal corresponding to be handled the frame synchronization of back acquisition TD-SCDMA signal and controls near-end built-up circuit 102, descending amplifying circuit 103, far-end built-up circuit 104 and up amplifying circuit 105 simultaneously; When Base-Band Processing submodule 107 judges that base station signals are descending time slot, control then that up link is closed, down link is opened; Otherwise, then control down link and close and make up link be out state.
Described radio-frequency transmitter 106 is baseband I/Q signal with the base station radio-frequency conversion of signals, can adopt the Direct Conversion mode, also can adopt repeatedly frequency conversion mode, comprising digital intermediate frequency mode.Radio-frequency transmitter 106 receives the ATT configuration and the frequency configuration of basic Base-Band Processing submodule 107, be locked on the frequency of configuration, export I after the radiofrequency signal of specific carriers frequency is converted to base-band analog signal, Q two-way analog signal carries out corresponding signal process for Base-Band Processing submodule 107.
See also Fig. 2, described Base-Band Processing submodule 202 is by A/D sample circuit 211, Finite Impulse Response filter 212, and base band detection module 213, synchronous searching module 214, synchronized result authentication module 215, control signal generating module 216, control signal driver module 217, MCU minimum system 218, AGC module 219 and PLL configuration module 220 constitute.The input of A/D sample circuit 211 is connected with radio-frequency transmitter 201, output is connected with Finite Impulse Response filter 212 inputs, the output of digital filter 212 is connected with the input of base band detection module 213, the output of base band detection module 213 is connected with the input of synchronous searching module 214 with AGC module 219 respectively, the output of synchronous searching module 214 links to each other with the input of synchronized result authentication module 215, the output of synchronized result authentication module 215 respectively with base band detection module 213, synchronous searching module 214, control signal generating module 216, MCU minimum system 218, the input of AGC module 219 and PLL configuration module 220 links to each other, the output of control signal generating module 216 links to each other with the input of control signal driver module 217, the output of MCU minimum system 218 is connected with the input of AGC219 and PLL configuration module 220, and AGC219 is connected with radio-frequency transmitter 201 with the output of PLL configuration module 220.
Please in conjunction with Fig. 1 and Fig. 2, among the present invention, function and workflow that radio-frequency transmitter 201 and Base-Band Processing submodule 202 are realized are as described below:
1) MCU minimum system 218 receives the information of Monitor And Control Subsystem, work carrier frequency point and link ATT by PLL configuration module 220 and AGC module 219 configuration radio-frequency transmitters 201 are provided with, thereby make radio-frequency transmitter 201 that the TD-SCDMA radiofrequency signal of corresponding carriers frequency is converted into the baseband analog i/q signal.The two-way baseband analog i/q signal of output can be that differential signal also can be a single-ended signal.Radio-frequency transmitter 201 and Base-Band Processing submodule 202 all right searching carrier frequencies automatically and adjustment ATT setting automatically, the synchronous mark signal that this moment, PLL configuration module 220 and AGC module 219 were exported according to synchronized result authentication module 215, the work carrier frequency point and the link ATT that dispose radio-frequency transmitter 201 one by one are provided with, till on the system synchronization.
2) the two-way baseband analog i/q signal of radio-frequency transmitter 201 outputs is conveyed into A/D sample circuit 211 and samples acquisition baseband I/Q way word signal, the data input FIR filter 212 after the sampling.
3) the I/Q two-way base band data of 212 pairs of inputs of FIR filter carries out digital filtering respectively, and the filtering partial noise is to improve synchronous dynamic scope and performance.Filtered data input base band detection module 213.
4) the I/Q two-way of 213 pairs of inputs of base band detection module carries out the computing of I*I+Q*Q, thereby obtain the envelope signal of TD-SCDMA signal, then the envelope signal that obtains is carried out threshold judgement, what be higher than thresholding is judged to 1, what be lower than thresholding is judged to 0, thereby obtain the final baseband envelope rectified signal of usefulness synchronously, give synchronous searching module 214 with this signal and carry out synchronous searching.The decision threshold that base band detection module 213 is used uses Adaptive adjusting algorithm to carry out real-time progressively reduction adjustment according to the synchronous mark signal that synchronized result authentication module 215 feeds back, thereby can improve the synchronous dynamic scope of whole system.Envelope data before base band detection module 213 will relatively be adjudicated is given AGC module 219, system obtain to the TD-SCDMA signal synchronously after, AGC module 219 is according to the ATT controlling value of the envelope intensity adjustment output of input, thereby adjust the link ATT of radio-frequency transmitter 201, make the signal strength signal intensity of radio-frequency transmitter 201 outputs remain on a relatively more suitable scope.
5) synchronous searching module 214 is carried out the search differentiation of down-going synchronous according to these 3 specific envelope characteristic of descending synchronous code time slot and both sides GP time slot thereof to the baseband envelope rectified signal of base band detection module 213 inputs, finds out the position of the descending synchronous code of TD-SCDMA signal.Actual signal is because a variety of causes such as noise jamming, multipath cause descending synchronous code envelope length and two other GP slot time width thereof to fluctuate in a scope.Adopt Adaptive adjusting algorithm progressively to relax adjustment in real time, thereby can improve the synchronous dynamic scope and the performance of whole system according to the synchronous control signal that synchronized result authentication module 215 feeds back.Synchronous searching module 214 provides a down-going synchronous index signal to synchronized result authentication module 216 after finishing synchronous searching.
6) synchronous indicating signal of 215 pairs of synchronous searching modules of synchronized result authentication module, 214 inputs is verified.Because wireless sub-frame of the every 5ms transmission of TD-SCDMA signal, if the frame synchronization result of all subframes is correct, per two adjacent index signals are at a distance of 5ms in the frame synchronization index signal that then provides.Around this principle, the down-going synchronous index signal of 215 pairs of synchronous searching modules of synchronized result authentication module, 214 inputs is verified.After checking was correct, output was verified synchronous accurate indication and is exported correct synchronous control signal and produce control signal for control signal generating module 216.
7) control signal generating module 216 produces switch-over control signal according to the synchronous control signal of synchronized result authentication module 215 inputs and the uplink and downlink switching point information of MCU minimum system input.The MCU minimum system obtains the uplink and downlink switching point information of TD-SCDMA signal from Monitor And Control Subsystem.
8) control signal driver module 217 is converted to the level signal that system needs with the switch-over control signal of control signal generating module 216 inputs, as differential signal or CMOS level signal.The switch-over control signal of control signal driver module 217 outputs promptly can be used for controlling the uplink downlink switching (consulting Fig. 5) of covering system.
Among the present invention, Finite Impulse Response filter 212, base band detection module 213, synchronous searching module 214, synchronized result authentication module 215, control signal generating module 216 can realize in FPGA, CPLD and EPLD chip; AGC module 219 and PLL configuration module 220 can be realized in FPGA, CPLD and EPLD chip, also can be placed in the MCU minimum system and realize; A/D sample circuit 211 uses corresponding AD sampling A to realize.
Please consult Fig. 1 again, following mask body is set forth the process that its uplink and downlink timeslot switches: the base station signal that donor antenna receives through DT port access arrangement after coupler is converted to baseband I/Q signal to radio-frequency transmitter and by radiofrequency signal, baseband I/Q signal enters the Base-Band Processing submodule again, through after the respective handling of this module, realize synchronously with base station signal exactly.Control corresponding switch at the corresponding switching point of TD-SCDMA signal and switch, thereby between uplink downlink, switch; If it is descending time slot that the Base-Band Processing submodule is judged base station signal, open down link after then closing up link by respective switch control, the repeater is handled downstream signal and is amplified, after the MT port is emitted to user mobile phone by user antenna; When the DT port did not have the downstream signal time slot, respective switch control down link was closed, and up link is in out state, and then upward signal is handled through the repeater and amplified, and transmits go back to the base station by donor antenna at last.The native system block diagram is equally applicable to electric light mixing repeater and supporting with it tower amplifier and trunk amplifier.
Please consult Fig. 1 again, the various states of 108 pairs of covering systems of Monitor And Control Subsystem are monitored, and can the teletransmission state information give Surveillance center, and can accept various parameter settings.Monitor And Control Subsystem 108 can also be by the switching point of 485 interface configuration synchronization module up-downgoings switching, 1,6 configuration (acquiescence is between time slot 3,4) arbitrarily of configuration scope time slot; If desired at other time slot, the upper strata supervisory control system can realize the software remote update by the new switching point of 485 serial ports notice MCU configuration so.The covering system Monitor And Control Subsystem by 485 interfaces can also the configuration synchronization module the sync carrier frequency and the value of the link ATT of radio-frequency transmitter.
In the second embodiment of the present invention, described covering system can be broken down into relay and capped end two parts, and Fig. 3 a and Fig. 3 b represent the theory diagram of its relay and capped end respectively.Relatively two figure in the present embodiment, are separated into the subsystem of two symmetries with first embodiment as can be seen, and the relay is corresponding substantially with the structure of capped end, just in the middle of employing optical fiber connect, to reach the purpose of prolongation communication line.
Among Fig. 3 a, the relay comprises coupler 301, near-end built-up circuit 302, descending amplifying circuit 303, up amplifying circuit 307, radio-frequency transmitter 309, Base-Band Processing submodule 308, Monitor And Control Subsystem 306 and a pair of optical transceiver 304 and 305: described near-end built-up circuit 302, coupler 301, descending amplifying circuit 303, optical transceiver 304 electrically connect successively and constitute down link; Described optical transceiver 305, up amplifying circuit 307, near-end built-up circuit 302 electrically connect successively and constitute up link; Coupler 301 will be transferred to radio-frequency transmitter 309 and descending amplifying circuit 303 through the downstream signal that near-end built-up circuit 302 obtains from the base station; Descending amplifying circuit 303 amplifies downstream signal after optical transceiver 304 transfers to capped end; Up amplifying circuit 307 will amplify after near-end built-up circuit 302 transfers to the base station through the upward signal from capped end that optical transceiver 305 transmission come.
Fig. 3 b capped end then comprises coupler 326, radio-frequency transmitter 318, Base-Band Processing submodule 319, Monitor And Control Subsystem 323, far-end built-up circuit 320, up amplifying circuit 322, descending amplifying circuit 321 and a pair of optical transceiver 317 and 324: described optical transceiver 317, coupler 326, descending amplifying circuit 321, far-end built-up circuit 320 electrically connect successively and constitute down link; Described far-end built-up circuit 320, up amplifying circuit 322, optical transceiver 324 electrically connect successively and constitute up link; Coupler 326 will be transferred to radio-frequency transmitter 318 and descending amplifying circuit 321 through the downstream signal that optical transceiver obtains from the relay; Descending amplifying circuit 321 amplifies downstream signal after 320 outputs of far-end built-up circuit cover; Up amplifying circuit 322 amplifies the upward signal that 320 transmission of far-end built-up circuit come after optical transceiver transfers to the relay.
In conjunction with Fig. 3 a and Fig. 3 b, the base station signal that the relay donor antenna receives enters the relay after coupler is converted to baseband I/Q signal to radio-frequency transmitter and by radiofrequency signal through the DT port, baseband I/Q signal enters the Base-Band Processing submodule again, through after the respective handling of this module, realize synchronously with base station signal exactly, if the Base-Band Processing submodule judges that base station signal is a descending time slot, then controlling up link closes, down link is opened, the relay is handled downstream signal and is amplified, again by optical transceiver by Optical Fiber Transmission to capped end.The capped end optical transceiver receives that the next signal of Optical Fiber Transmission is after opto-electronic conversion, couple a signal to radio-frequency transmitter, then enter the Base-Band Processing submodule, through after the base band signal process of this module, if the Base-Band Processing submodule judges that signal is a descending time slot, then to control up link and close, down link is opened, capped end is handled downstream signal and is amplified, and is emitted to user mobile phone by user antenna; If the Base-Band Processing submodule judges that signal is an ascending time slot, down link is closed, and the up link of capped end and far-end all is in out state, so that upward signal is carried out long-distance transmissions to the base station through optical fiber.
Please consult Fig. 3 a and Fig. 3 b again, the various states of Monitor And Control Subsystem 306 and 323 pairs of covering systems are monitored, and can the teletransmission state information give Surveillance center, and can accept various parameter settings.Monitor And Control Subsystem 306 and 323 can also be by the switching point of 485 interface configuration synchronization module up-downgoings switching, 1,6 configuration (acquiescence is between time slot 3,4) arbitrarily of configuration scope time slot; If desired at other time slot, the upper strata supervisory control system can realize the software remote update by the new switching point of 485 serial ports notice MCU configuration so.The covering system Monitor And Control Subsystem by 485 interfaces can also the configuration synchronization module the sync carrier frequency and the value of the link ATT of radio-frequency transmitter.
See also Fig. 4, it is the third embodiment of the present invention.Please consult Fig. 1 again, described coupler 101, radio-frequency transmitter 106 and Base-Band Processing submodule 107 can carry out proper transformation according to application in the position of system and be coupler 401 as shown in Figure 4, radio-frequency transmitter 407 and Base-Band Processing submodule 406, this conversion are applicable to wireless discharging-directly station, optical fiber repeater, electric light mixing repeater and supporting with it tower amplifier and trunk amplifier.In this embodiment, covering system is when initialization, Base-Band Processing submodule 406 does not provide before the uplink and downlink timeslot judged result, down link is in normally open, the TD-SCDMA signal of base station via downlink transmission to coupler 401, through radio-frequency transmitter 407 and Base-Band Processing submodule 406, provide difference or cmos signal control near-end built-up circuit 402, descending amplifying circuit 403, far-end built-up circuit 404 and up amplifying circuit 405 by Base-Band Processing submodule 406 then, thereby between uplink downlink, switch.。
See also Fig. 5, the synchronization module among the present invention is responsible for producing the control signal that uplink and downlink timeslot switches.Open descending/up link again after closing the Uplink/Downlink of operating state among the present invention earlier, the time-delay of service time increases the isolation of up-downgoing circuit, to avoid the self-excitation of repeater; As an example of using, control that to open up amplifying circuit control line after effective 6 chip of control line that descending amplifying circuit cuts out effective; Control after effective 4 chip of control line that up amplifying circuit cuts out, it is effective to control the control line that descending amplifying circuit opens.In addition, can change effective chip number of the control line that descending amplifying circuit and up amplifying circuit close by corresponding software.
The present invention is applicable to wireless discharging-directly station, optical fiber repeater, in the covering systems such as electric light mixing repeater, tower amplifier and trunk amplifier.
The present invention is described in narrative mode all the time, and wherein employed term is intended to describe and unrestricted.According to above description, can make many further modifications to the present invention, also can do many variations according to actual needs.Therefore, in additional claim scope, the present invention can adopt various implementation to specifically described embodiment.
Claims (13)
1, a kind of time division synchronous code division multiple access covering system comprises coupler, near-end built-up circuit, far-end built-up circuit, up amplifying circuit, descending amplifying circuit and Monitor And Control Subsystem;
Described near-end built-up circuit, descending amplifying circuit, the far-end built-up circuit electrically connects the formation down link successively; Described far-end built-up circuit, up amplifying circuit, the near-end built-up circuit electrically connects the formation up link successively;
Described near-end built-up circuit is forwarded to the input port of descending amplifying circuit with base station signal, and up output signal is forwarded to the base station; Described far-end built-up circuit is forwarded to the input port of up amplifying circuit with upward signal, and descending output signal is forwarded to far-end;
The base station signal that comes through near-end built-up circuit transmission is carried out descending amplification with descending amplifying circuit after the far-end built-up circuit transfers to far-end covers; Up amplifying circuit amplifies after the near-end built-up circuit transfers to the base station the upward signal that comes through the transmission of far-end built-up circuit;
Monitor And Control Subsystem is monitored the various states of covering system, can the teletransmission state information give Surveillance center, and can accept various parameter settings;
It is characterized in that:
Set up synchronization module, its output connects up link and down link respectively;
The output of described coupler connects the input port of synchronization module, coupler carries out after the signal coupling signal being transferred to synchronization module in the down link somewhere, synchronization module will be handled the back by the base station information that the coupler transmission comes and obtain frame synchronization information, output control signals to uplink downlink to control its break-make according to this frame synchronization information, when base station signal is descending time slot, then control down link and open, up link is closed; Otherwise, then to control up link and open, down link is closed.
2, the time division synchronous code division multiple access covering system according to claim 1 is characterized in that:
Described synchronization module comprises radio-frequency transmitter and Base-Band Processing submodule, the input of radio-frequency transmitter is done to be connected with coupler with the input of synchronization module, its output is connected with the input of Base-Band Processing submodule, and the output of Base-Band Processing submodule connects down link as the output of synchronization module;
Radio-frequency transmitter will demodulate the Analog Baseband i/q signal from the TD-SCDMA signal of described coupler input; The Base-Band Processing submodule carries out obtaining after the Digital Signal Processing frame synchronization to the TD-SCDMA signal to the Analog Baseband i/q signal of radio-frequency transmitter input, and output control signal control covering system carries out the switching of uplink and downlink link, when base station signal is descending time slot, control then that up link is closed, down link is opened; Otherwise, control then that down link closes, up link is opened.
3, according to claim 1 or 2 described time division synchronous code division multiple access covering systems, it is characterized in that: described coupler is positioned at the optional position of down link, and the base station signal of proper strength is provided to synchronization module by the adjustment of the degree of coupling.
4, the time division synchronous code division multiple access covering system according to claim 3, it is characterized in that: described descending amplifying circuit and up amplifying circuit can be by LNA, frequency-selecting, the power amplifier three forms, also can form by a part wherein, its characteristics are to finish enlarging function, can carry out opening and closing according to the control signal that synchronization module transmits simultaneously.
5, the time division synchronous code division multiple access covering system according to claim 4 is characterized in that: when described radio-frequency transmitter is converted to baseband I/Q signal with base station signal, can adopts the Direct Conversion mode or adopt repeatedly frequency conversion mode.
6, time division synchronous code division multiple access covering system according to claim 2 is characterized in that: described Base-Band Processing submodule comprises A/D sample circuit, Finite Impulse Response filter, base band detection module, synchronous searching module, synchronized result authentication module, control signal generating module, control signal driver module, MCU minimum system, AGC module and PLL configuration module;
The A/D sample circuit is finished the analog-to-digital conversion of baseband I/Q signal, and its input is connected with the output of radio-frequency transmitter, and its output is connected with the input of Finite Impulse Response filter;
Finite Impulse Response filter carries out filtering with digitized baseband I/Q signal, and its output is connected with the input of base band detection module;
The base band detection module will extract from the signal that the transmission of FIR filter comes and be used for synchronous baseband envelope rectified signal, and its output is connected with the input of synchronous searching module with the AGC module respectively;
The synchronous searching module is carried out the search differentiation of down-going synchronous to the baseband envelope rectified signal of base band detection module input according to the envelope characteristic of the GP time slot on descending synchronous code time slot and both sides thereof, find out the position of downlink synchronous code of TD-SCDMA signal, its output is connected with the input of synchronized result authentication module;
The synchronized result authentication module verifies that to the synchronous indicating signal of synchronous searching module input its output is connected with the input of base band detection module, synchronous searching module, control signal generating module, MCU minimum system, AGC module and PLL configuration module respectively;
Control signal generating module produces switch-over control signal according to the synchronous control signal of synchronized result authentication module input and the uplink and downlink switching point information of MCU minimum system input, and its output is connected with the input of control signal driver module;
The MCU minimum system receives the information of Monitor And Control Subsystem, work carrier frequency point and link ATT by PLL configuration module and AGC block configuration radio-frequency transmitter are provided with, obtain the uplink and downlink switching point signal of TD-SCDMA, its output is connected with the input of AGC module and PLL configuration module;
The AGC module is connected with the input of radio-frequency transmitter with the output of PLL configuration module, the AGC module is according to the ATT controlling value of the envelope intensity adjustment output of input, thereby adjust the link ATT of radio-frequency transmitter, make the signal strength signal intensity of radio-frequency transmitter output remain on suitable scope;
The control signal driver module is converted to the needed level signal of system with the switch-over control signal of control signal generating module input, and switch, far end radio frequency switch, low noise amplifier and power amplifier are connected its output frequently with described end-fire respectively.
7, time division synchronous code division multiple access covering system according to claim 6, it is characterized in that: described radio-frequency transmitter and Base-Band Processing submodule can carry out automatic searching carrier frequency and automatically adjust the ATT configuration, also can work carrier frequency and ATT configuration be set by the manual configuration information that the MCU minimum system receives the Monitor And Control Subsystem of covering system.When carrying out automatic searching carrier frequency and adjusting the ATT configuration automatically, PLL configuration module and AGC module are according to the synchronous mark signal of synchronized result authentication module output, dispose the work carrier frequency point of radio-frequency transmitter and link ATT one by one and be provided with, reach till synchronously until system.
8, time division synchronous code division multiple access covering system according to claim 7 is characterized in that the detailed process that described base band detection module extraction is used for synchronous baseband envelope rectified signal is:
(1) the filtered two-way baseband I/Q signal of digital FIR carries out the I*I+Q*Q computing, obtains the energy envelope signal of TD-SCDMA signal;
(2) the energy envelope signal that is obtained is carried out thresholding and differentiate, be higher than thresholding and be judged to 1, be lower than thresholding and be judged to 0, thereby obtain to be used for synchronous baseband envelope rectified signal.
(3) thresholding that is used to differentiate can be adjusted automatically, and initial value is a higher value, carries out real-time self adaptation according to the synchronous mark signal of synchronized result authentication module feedback and progressively reduces adjustment, reaches till synchronously until system.
9, baseband according to claim 8 is characterized in that: the level signal that described control signal driver module is produced can be differential signal or CMOS level signal.
10, according to any described baseband of claim 6 to 9, it is characterized in that: described Finite Impulse Response filter, base band detection module, synchronous searching module, synchronized result authentication module, control signal generating module realize in FPGA, CPLD or EPLD chip.
11, baseband according to claim 10 is characterized in that: described AGC module and PLL configuration module can be realized in FPGA, CPLD or EPLD chip, also can realize in the MCU minimum system.
12, according to any described time division synchronous code division multiple access covering system of claim 6 to 9, it is characterized in that: the value of the link ATT of the switching point that described Monitor And Control Subsystem switches by 485 interface configuration synchronization module up-downgoings and the sync carrier frequency of configuration synchronization module and radio-frequency transmitter, and realize the software remote update.
13, the synchronous time division synchronous code division multiple access covering system of application correlation detection according to claim 1 and 2, it is characterized in that: when covering system was broken down into relay and capped end, then described relay and capped end should be provided with described synchronization module simultaneously.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101841686A (en) * | 2010-04-28 | 2010-09-22 | 北京东方广视科技股份有限公司 | Data signal amplification method and system |
| CN101217307B (en) * | 2008-01-18 | 2011-05-11 | 福建邮科通信技术有限公司 | A TD-SCDMA repeater baseband decoding device and method for synchronous decoding |
| CN102611507A (en) * | 2011-12-26 | 2012-07-25 | 深圳市虹远通信有限责任公司 | Full-synchronizing TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) optical-fiber amplification system |
| CN113746522A (en) * | 2021-07-21 | 2021-12-03 | 北京赫微科技有限公司 | 5G repeater signal processing method |
| CN114337766A (en) * | 2020-09-30 | 2022-04-12 | 新岸线(北京)科技集团有限公司 | Method and device for realizing indoor wireless signal coverage |
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2006
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101217307B (en) * | 2008-01-18 | 2011-05-11 | 福建邮科通信技术有限公司 | A TD-SCDMA repeater baseband decoding device and method for synchronous decoding |
| CN101841686A (en) * | 2010-04-28 | 2010-09-22 | 北京东方广视科技股份有限公司 | Data signal amplification method and system |
| CN102611507A (en) * | 2011-12-26 | 2012-07-25 | 深圳市虹远通信有限责任公司 | Full-synchronizing TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) optical-fiber amplification system |
| CN102611507B (en) * | 2011-12-26 | 2014-12-31 | 深圳市虹远通信有限责任公司 | Full-synchronizing TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) optical-fiber amplification system |
| CN114337766A (en) * | 2020-09-30 | 2022-04-12 | 新岸线(北京)科技集团有限公司 | Method and device for realizing indoor wireless signal coverage |
| CN113746522A (en) * | 2021-07-21 | 2021-12-03 | 北京赫微科技有限公司 | 5G repeater signal processing method |
| CN113746522B (en) * | 2021-07-21 | 2022-10-04 | 北京赫微科技有限公司 | 5G repeater signal processing method |
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