CN1889549A - Base band detection synchronous module applied to TD-SCDMA covering system - Google Patents
Base band detection synchronous module applied to TD-SCDMA covering system Download PDFInfo
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- CN1889549A CN1889549A CNA2006100365203A CN200610036520A CN1889549A CN 1889549 A CN1889549 A CN 1889549A CN A2006100365203 A CNA2006100365203 A CN A2006100365203A CN 200610036520 A CN200610036520 A CN 200610036520A CN 1889549 A CN1889549 A CN 1889549A
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Abstract
A baseband detection synchronous module of TD-SCDMA overlap system consists of radio frequency receiver and baseband processing sub module. It is featured as demodulating out analog downlink baseband I/O signal by said receiver and obtaining frame synchronous information by said sub module, outputting control signal to TD-SCDMA overlap system according to frame synchronous signal for controlling on-off state of links in overlap system, switching off uplink and switching on downlink when base station signal is downlink time slot or otherwise switching off downlink and switching on uplink.
Description
[technical field]
The present invention relates to moving communicating field, relate in particular to a kind of base band detection synchronous module of the TD-SCDMA of being applied to covering system.
[technical background]
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 change the time slot switching point neatly according to the needs of business, satisfies 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.
Traditional detection method for synchronous obtains the envelope of TD-SCDMA signal by the radio frequency detecting circuit, utilize the feature of descending synchronous code time slot signal envelope then, find the frame synchronization of TD-SCDMA signal by the envelope position of searching for this specific width for the special time width.The method because simple, that cost is lower etc. is former because the TD-SCDMA covering system provides TD-SCDMA signal frame synchronizing function preferably, makes the TD-SCDMA covering system can realize the switching of uplink and downlink timeslot, finish seamless signal and amplify forwarding capability.
But traditional detection method for synchronous exists some shortcomings, and when low or when having stronger co-channel interference signal to exist, performance is not good as the TD-SCDMA Signal-to-Noise of input; When there is a plurality of carrier wave in the applied environment of covering system, the envelope detection signal of radio frequency detecting circuit output this moment is the envelope stack of a plurality of carrier signals, because different carrier signals may not be a strict synchronism, the useful signal time width of the envelope detection signal that obtain feasible this moment is broadened, detection this moment synchronized result is inaccurate, CF signal maintenance precise synchronization that can't be synchronous with hope.
[summary of the invention]
Purpose of the present invention just is the defective at traditional detection method for synchronous existence, by using new base band detection method for synchronous, a kind of base band detection synchronous module of the TD-SCDMA of being applied to covering system is provided, under the lower-cost prerequisite of maintenance, provide than the more superior net synchronization capability of traditional detection method for synchronous 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.
The objective of the invention is to be achieved through the following technical solutions:
The base band detection synchronous module that this is applied to the TD-SCDMA covering system comprises radio-frequency transmitter and Base-Band Processing submodule;
The input of radio-frequency transmitter is connected with the output of the coupler of TD-SCDMA covering system, the output of radio-frequency transmitter then is connected with the input of Base-Band Processing submodule, and the output of Base-Band Processing submodule then connects the uplink and downlink link of TD-SCDMA covering system respectively;
Radio-frequency transmitter will be undertaken obtaining baseband I/Q signal after the demodulation by the downlink radio-frequency signal of coupler input, and exports baseband I/Q signal to the Base-Band Processing submodule;
Described Base-Band Processing submodule will be undertaken by the downgoing baseband i/q signal that radio-frequency transmitter receives obtaining frame synchronization information after the digitized processing, the uplink and downlink link that outputs control signals to the TD-SCDMA covering system according to this frame synchronization information is to control its on off operating mode respectively, 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 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 to the Analog 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, the filtering partial noise, and to improve synchronous dynamic scope and performance, the output of Finite Impulse Response filter 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 the Monitor And Control Subsystem of TD-SCDMA covering system, and its output is connected with AGC module, PLL configuration module and control signal generating module input;
The work carrier frequency point of PLL configuration module configuration radio-frequency transmitter, can be provided with by the information that the MCU minimum system receives the Monitor And Control Subsystem of covering system, also can carry out the automatic search of carrier frequency point, unite with the AGC module this moment and finish automatic searching carrier frequency and adjust the ATT configuration automatically;
The link ATT value of AGC block configuration radio-frequency transmitter, can be provided with by the information that the MCU minimum system receives the Monitor And Control Subsystem of covering system, also can be according to the ATT controlling value of the envelope intensity adjustment output of importing, thereby adjust the link ATT of radio-frequency transmitter, make the signal strength signal intensity of radio-frequency transmitter output remain on suitable scope;
Described radio-frequency transmitter and Base-Band Processing submodule can be finished automatic searching carrier frequency and adjust the ATT configuration automatically, the synchronous mark that this moment, PLL configuration module and AGC module were exported according to the synchronized result authentication module, 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 Processing submodule extracts the detailed process that is used for synchronous baseband envelope rectified signal:
(1) the filtered two-way baseband I/Q signal of digital FIR is carried out the I*I+Q*Q computing, obtain the envelope signal of TD-SCDMA signal;
(2) 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.
Compared with prior art, the present invention possesses following advantage: base band detection synchronous module has adopted comparatively advanced person's method of synchronization efficiently, under the lower-cost prerequisite of maintenance, provide than the more superior net synchronization capability of traditional detection method for synchronous 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 the application block diagram of the present invention in the TD-SCDMA covering system;
Fig. 2 is the theory diagram of base band detection synchronous module of the present invention;
Fig. 3 a, 3b are the application schematic diagram of second embodiment of the invention;
Fig. 4 is the application block 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 base band detection module of the present invention.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
The invention discloses a kind of base band detection synchronous module of the TD-SCDMA of being applied to covering system.This module is utilized the corresponding signal process technology, realizes the frame synchronization to the TD-SCDMA signal.Switch at the corresponding mains switch of corresponding switching point control covering system, thereby between up-downgoing, switch.
The application block diagram of the present invention in the TD-SCDMA covering system 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 form by a part wherein) 105, radio-frequency transmitter 106, Base-Band Processing submodule 107 and Monitor And Control Subsystem 108 constitute, wherein radio-frequency transmitter 106 and Base-Band Processing submodule 107 are the component part of base band detection synchronous module of the present invention.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 the Monitor And Control Subsystem of covering system, 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 demodulated 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 was in the upward 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; Wherein, the functional circuit of Base-Band Processing submodule is total: by A/D sample circuit, Finite Impulse Response filter, and base band detection, synchronous searching, synchronized result checking, control signal generation, control signal driving, MCU minimum system, AGC and PLL configuration module.The flow process of its signal processing is as follows: radio-frequency transmitter demodulates two-way baseband I/Q signal to the TD-SCDMA radiofrequency signal of input, A/D through a two-way of Base-Band Processing submodule samples, the Base-Band Processing submodule carries out the FIR digital filtering to the data after the sampling, base band detection and synchronous searching are then verified the result of synchronous searching.Like this, just, can finish exactly with base station signal synchronously.According to TD-SCDMA signal frame structure characteristics, output differential signal or cmos signal go to control the opening and closing of uplink downlink.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 switching point that the Monitor And Control Subsystem of covering system switches by 485 interface configuration base band detection synchronous module up-downgoings, 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 Monitor And Control Subsystem of covering system can also dispose the value of the link ATT of the sync carrier frequency of base band detection synchronous module and radio-frequency transmitter by 485 interfaces.
Be applied among second embodiment of optical fiber repeater covering system in the present invention, the optical fiber repeater covering system is made up of 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 the covering system among 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.
In conjunction with Fig. 3 a and Fig. 3 b, adopt base station signal that the relay donor antenna receives through DT port access arrangement after coupler is converted to baseband I/Q signal to radio-frequency transmitter 309 and by radiofrequency signal, baseband I/Q signal enters Base-Band Processing submodule 308 again, through after the respective handling of this module, realize synchronously with base station signal exactly, if Base-Band Processing submodule 308 judges that base station signal is a descending time slot, then controlling up link closes, down link is opened, the repeater 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 318, then enter Base-Band Processing submodule 319, through after the base band signal process of this module, if Base-Band Processing submodule 319 judges that signal is a descending time slot, then to control up link and close, down link is opened, the repeater is handled downstream signal and is amplified, and is emitted to user mobile phone by user antenna.When system did not detect to ascending time slot, down link was 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 switching point that the Monitor And Control Subsystem of covering system switches by 485 interface configuration base band detection synchronous module up-downgoings, 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 Monitor And Control Subsystem of covering system can also dispose the value of the link ATT of the sync carrier frequency of base band detection synchronous module and radio-frequency transmitter by 485 interfaces.
See also Fig. 4, it is applied to the 3rd embodiment of TD-SCDMA covering system for 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, base band detection synchronous module of 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 (10)
1, a kind of base band detection synchronous module that is applied to the TD-SCDMA covering system is characterized in that:
Comprise radio-frequency transmitter and Base-Band Processing submodule;
The input of radio-frequency transmitter is connected with the output of the coupler of TD-SCDMA covering system, the output of radio-frequency transmitter then is connected with the input of Base-Band Processing submodule, and the output of Base-Band Processing submodule then connects the uplink and downlink link of TD-SCDMA covering system respectively;
Described radio-frequency transmitter will be undertaken obtaining baseband I/Q signal after the demodulation by the downlink radio-frequency signal of coupler input, and exports baseband I/Q signal to the Base-Band Processing submodule;
Described Base-Band Processing submodule will be undertaken by the downgoing baseband i/q signal that radio-frequency transmitter receives obtaining frame synchronization information after the digitized processing, the uplink and downlink link that outputs control signals to the TD-SCDMA covering system according to this frame synchronization information is to control its on off operating mode respectively, 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.
2, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 1 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 the Monitor And Control Subsystem of covering system, 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 its output is connected with the uplink and downlink link of TD-SCDMA covering system respectively.
3, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 1 and 2, it is characterized in that: when described radio-frequency transmitter is demodulated into baseband I/Q signal with the base station radio-frequency signal, can adopts the Direct Conversion mode or adopt repeatedly frequency conversion mode.
4, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 3, it is characterized in that: described radio-frequency transmitter and Base-Band Processing submodule can carry out automatic searching carrier frequency and adjust the ATT configuration automatically, 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.
5, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 4 is characterized in that described Base-Band Processing submodule extracts the detailed process that is used for synchronous baseband envelope rectified signal and 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.
6, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 2 is characterized in that: the level signal that described control signal driver module is produced can be differential signal or CMOS level signal.
7, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 2 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.
8, according to the base band detection synchronous module that is applied to the TD-SCDMA covering system described in any one of the claim 4 to 5, 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.
9, according to claim 2 or the 7 described base band detection synchronous modules that are applied to the TD-SCDMA covering system, it 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.
10, the base band detection synchronous module that is applied to the TD-SCDMA covering system according to claim 8 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.
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| CNB2006100365203A CN100574292C (en) | 2006-07-17 | 2006-07-17 | Be applied to the base band detection synchronous module of TD-SCDMA covering system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035606A (en) * | 2009-10-07 | 2011-04-27 | 索尼公司 | Radio communication device, signal strength output method and radio communication system |
| CN103490844A (en) * | 2013-10-10 | 2014-01-01 | 南京云恒瑞通网络科技有限责任公司 | Hour-minute synchronous wireless network cover system and work method thereof |
| CN109362126A (en) * | 2018-11-09 | 2019-02-19 | 京信通信系统（中国）有限公司 | The synchronous methods, devices and systems of frequency point |
-
2006
- 2006-07-17 CN CNB2006100365203A patent/CN100574292C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035606A (en) * | 2009-10-07 | 2011-04-27 | 索尼公司 | Radio communication device, signal strength output method and radio communication system |
| CN102035606B (en) * | 2009-10-07 | 2014-10-08 | 索尼公司 | Radio communication device, signal strength output method and radio communication system |
| CN103490844A (en) * | 2013-10-10 | 2014-01-01 | 南京云恒瑞通网络科技有限责任公司 | Hour-minute synchronous wireless network cover system and work method thereof |
| CN109362126A (en) * | 2018-11-09 | 2019-02-19 | 京信通信系统（中国）有限公司 | The synchronous methods, devices and systems of frequency point |
| CN109362126B (en) * | 2018-11-09 | 2022-05-06 | 京信网络系统股份有限公司 | Method, device and system for frequency point synchronization |
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| Publication number | Publication date |
|---|---|
| CN100574292C (en) | 2009-12-23 |
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