CN101141182B - Uplink synchronous tracking device and method - Google Patents
Uplink synchronous tracking device and method Download PDFInfo
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Abstract
The present invention discloses an uplink synchronous tracking device, which comprises a duple interpolation and mean power unit to conduct duple linear interpolation for effective channel impact responses and calculate mean power of each point according to antenna, a loose measuring unit to acquire power threshold value in light of loose time delay measuring and find out a starting point, an end point and a peak value point exceeding the threshold value as above, a quadruple interpolation and fine measuring unit to fulfill quadruple interpolation nearby the starting point, the end point and the peak value point provided by the loose measuring unit to get each point after the quadruple interpolation, a synchronous control command creating unit to create synchronous control commands for the starting point, the end point and the peak value point provided by the quadruple interpolation and fine measuring unit after fine measuring, a synchronous command mapping and filling unit to map aforesaid synchronous control commands into corresponding downlink time slots and a master control unit to transfer and control links of all units above and process interface parameters.
Description
Technical field
The present invention relates to the communications field, and more particularly, relate to a kind of uplink synchronous tracking device and method, it is particularly useful for TD-SCDMA (TD SDMA) mobile communication system.
Background technology
TD-SCDMA (TD SDMA) technology is compared with other 3G (Third Generation) Moblie technology, and one of its technical characterstic is to have the uplink synchronous technology.Uplink synchronous among the TD-SCDMA requires can arrive the base station synchronously from the upward signal of the different user terminals of different distance.Because mobile communication system is operated in the actual environment with serious interference, multipath transmisstion and Doppler effect, what realize ideal almost is impossible synchronously.But allow the main footpath of each upward signal reach synchronously the time of advent, the design that improves systematic function, simplification base station receiver is all had tangible benefit.In addition, it is pointed out that this place says be meant synchronously air interface synchronously, do not comprise between the network synchronously.
After UE (subscriber equipment) has set up uplink synchronous, because UE moves, therefore it is to Node B (Node B, distance down together) is always changing, like this, and in whole communication process, Node B must detect the due in of the intermediate code of its ascending time slot incessantly, and the x time of UE carried out closed-loop control, keeping reliably synchronously, Here it is follows the tracks of synchronously.
The detailed process of uplink synchronous is: Node B can estimate transmitting power and skew launch time of UE at same time slot by the intermediate code of measuring each UE.UE in the available descending time slot of the next one, launches simultaneous bias order and power control command then, so that can suitably adjust its launch time and power according to these orders respectively.This has guaranteed the stability of uplink synchronous, can carry out uplink synchronous one time a subframe.The adjustment step-length of uplink synchronous is configurable and is provided with that span is 0.125～1chip (chip), the renewal of uplink synchronous have three kinds may situations: increase a step-length, a step-length of minimizing or remain unchanged.
The uplink synchronization tracking technical method that is used for the TD-SCDMA system at present has the intermediate code utilized to carry out the characteristic of channel estimating, joint detection algorithm, solve because the interference that uplink loss causes, the complexity of this method has certain degree of difficulty than higher when Project Realization.
And when Project Realization, industry generally adopts software (mainly being high-performance digital signal processor) to realize at present, and its shortcoming is with high costs.
Summary of the invention
In view of the above problems, main purpose of the present invention is to provide the uplink synchronous tracking device and the method for the uplink synchronous function in a kind of TD-SCDMA of the realization system.It can be used as the part of the part of NodeB baseband chip or NodeB base band FPGA and plays a role.And when having reduced complexity, also reduced high manufacturing cost, help the realization of hardware.
To achieve these goals, according to a first aspect of the invention, the invention provides a kind of uplink synchronous tracking device, comprise: two times of interpolations and power averaging unit, be used for the efficient channel impulse response of each subscriber equipment is carried out two times of linear interpolations, and the power of each point is averaged according to antenna; The bigness scale unit is connected to above-mentioned two times of interpolations and power averaging unit, is used to obtain the power threshold of time delay bigness scale, and finds starting point, end point and the peak point that surpasses above-mentioned threshold value; Four times of interpolations and accurate measurement unit are connected to above-mentioned bigness scale unit, are used for carrying out near the above-mentioned starting point, end point and the peak point that are provided by above-mentioned bigness scale unit respectively four times of interpolations, obtain four times of starting point, end point and peak points after the interpolation; The synchronous control command generation unit is connected to above-mentioned four times of interpolations and accurate measurement unit, be used for according to the accurate measurement that provides by above-mentioned four times of interpolations and accurate measurement unit to starting point, end point and peak point information generate synchronous control command; Synch command mapping and filler cells are connected to above-mentioned synchronous control command generation unit, are used for above-mentioned synchronous control command is mapped to corresponding descending time slot; And main control unit, be connected to above-mentioned two times of interpolations and power averaging unit, bigness scale unit, four times of interpolations and accurate measurement unit, synchronous control command generation units and synch command is hinted obliquely at and filler cells, be used for above-mentioned each unit is dispatched and control connection, and carry out interface parameters and handle.
In above-mentioned uplink synchronous tracking device, above-mentioned bigness scale unit can be with power greater than first point of above-mentioned power threshold for starting point, that is, and the time started of effectively impacting in the channel impulse response; Power last greater than above-mentioned power threshold can be put as end point, that is, and the concluding time of effectively impacting in the channel impulse response; Can be peak point greater than the more preceding of above-mentioned power threshold with continuous 2 power sum maximums and power, that is, and the time to peak that effectively impacts in the channel impulse response.
In above-mentioned uplink synchronous tracking device, channel impulse response waveform, channel estimation window and time slot desired value that above-mentioned synchronous control command generation unit can generate by starting point, end point and the peak point information with above-mentioned accurate measurement compare and generate above-mentioned synchronous control command.
In above-mentioned uplink synchronous tracking device, above-mentioned synchronous control command can be sent to corresponding user equipment in this subframe or next subframe.
In above-mentioned uplink synchronous tracking device, can be kept in the random access memory in the above-mentioned main control unit through the mapping of above-mentioned synch command and filler cells mapped data result.
In above-mentioned uplink synchronous tracking device, above-mentioned synch command mapping and filler cells are before shining upon, the ascending time slot that subscriber equipment uses is numbered in above-mentioned uplink synchronous tracking device outside, and the synchronous adjustment character position that can fill synchronous control command in the descending time slot that uses of above-mentioned subscriber equipment is numbered.
In above-mentioned uplink synchronous tracking device, the parameter that above-mentioned main control unit is handled comprises above-mentioned uplink synchronous tracking device and outside input, output parameter interface, and the exchanges data between inner each subelement of device.
In above-mentioned uplink synchronous tracking device, for each subscriber equipment, above-mentioned two times of interpolations in the above-mentioned uplink synchronous tracking device and power averaging unit, bigness scale unit, four times of interpolations and accurate measurement unit, synchronous control command generation unit and synch command are hinted obliquely at the filler cells order and are sent separately dispatching command, and after finishing dealing with, sending the sign of finishing dealing with to above-mentioned main control unit, above-mentioned main control unit carries out data necessary according to the above-mentioned sign of finishing dealing with and handles the next unit of startup, back.
To achieve these goals, according to a second aspect of the invention, the present invention also provides a kind of uplink synchronization tracking method, may further comprise the steps: first step, read the pairing channel impulse response sequence of subscriber equipment first intermediate code in time slot, carry out two times of interpolations, and the average estimated channel power after the interpolation is averaged by antenna number; Second step, according to the noise gate that calculates gained, the elimination noise obtains starting point, end point and the peak point of two sampling precision; Third step according to above-mentioned starting point, end point and the peak point of the bigness scale that obtains, carries out four times of interpolations respectively in its vicinity in above-mentioned second step, obtain four times of starting point, end point and peak points after the interpolation; The 4th step produces synchronous control command according to the above-mentioned starting point after four times of interpolations that generate, end point and peak point in above-mentioned third step; And the 5th step, the above-mentioned synchronous control command that will produce in above-mentioned the 4th step is mapped in the downlink processing module.
In above-mentioned uplink synchronization tracking method, in above-mentioned third step, starting point, end point and peak point after above-mentioned four times of interpolations can have the octuple sampling precision.
In above-mentioned uplink synchronization tracking method, in above-mentioned the 4th step, can be further produce above-mentioned synchronous control command according to the historical information of former frames of above-mentioned subscriber equipment.
In above-mentioned uplink synchronization tracking method, above-mentioned synchronous control command can be sent to corresponding user equipment in this subframe or next subframe.
In above-mentioned uplink synchronization tracking method, before above-mentioned first step, may further include following steps: steps A: carry out system configuration, and preserve the channel impulse response of all subscriber equipmenies of time slot; Step B: judge whether to exist the subscriber equipment of activation,, then start the synch command that above-mentioned subscriber equipment is carried out and calculate if there is the subscriber equipment that activates.
In above-mentioned uplink synchronization tracking method, before above-mentioned the 5th step, may further include following steps: step C: judge whether that all activated subscriber equipment in the above-mentioned time slot has all carried out synchronous tracking processing.
By technique scheme, the present invention has realized following technique effect:
Exchanges data between apparatus of the present invention and the external unit realizes by RAM, to guarantee in design before this device starts therefore DSR can be realized with single port RAM, reduce the scale and the complexity of hardware circuit, external interface is simple simultaneously, is convenient to integrated.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the hardware unit of the uplink synchronous tracking device of the first embodiment of the present invention;
Fig. 2 is the general flowchart of uplink synchronization tracking method according to a second embodiment of the present invention;
Fig. 3 is the detailed process flow chart of uplink synchronization tracking method according to a second embodiment of the present invention; And
Fig. 4 realizes schematic diagram according to streamline of the present invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
First embodiment
Fig. 1 is the schematic diagram according to the hardware unit of the uplink synchronous tracking device 100 of present embodiment.
As shown in Figure 1, uplink synchronous tracking device of the present invention comprises: two times of interpolations and power averaging unit 102 are used for the efficient channel impulse response of each subscriber equipment is carried out two times of linear interpolations, and the power of each point are averaged according to antenna; Bigness scale unit 104 is connected to above-mentioned two times of interpolations and power averaging unit, is used to obtain the power threshold of the thick side of time delay, and finds starting point, end point and the peak point that surpasses above-mentioned threshold value; Four times of interpolations and accurate measurement unit 106, be connected to above-mentioned bigness scale unit 104, be used near the above-mentioned starting point, end point and the peak point that provide by above-mentioned bigness scale unit 104, carrying out respectively four times of interpolations, obtain four times of starting point, end point and peak points after the interpolation; Synchronous control command generation unit 108 is connected to above-mentioned four times of interpolations and accurate measurement unit 106, be used for according to the accurate measurement that provides by above-mentioned four times of interpolations and accurate measurement unit 106 to starting point, end point and peak point information generate synchronous control command; Synch command mapping and filler cells 110 are connected to above-mentioned synchronous control command generation unit 108, are used for above-mentioned synchronous control command is mapped to corresponding descending time slot; And main control unit 112, being connected to above-mentioned two times of interpolations and power averaging unit 102, bigness scale unit 104, four times of interpolations and accurate measurement unit 106, synchronous control command generation unit 108 and synch command hints obliquely at and filler cells 110, be used for above-mentioned each unit is dispatched and control connection, and carry out interface parameters and handle.
Above-mentioned bigness scale unit 104 can be with power greater than first point of above-mentioned power threshold for starting point, that is, and the time started of effectively impacting in the channel impulse response; Power last greater than above-mentioned power threshold can be put as end point, that is, and the concluding time of effectively impacting in the channel impulse response; Can be peak point greater than the more preceding of above-mentioned power threshold with continuous 2 power sum maximums and power, that is, and the time to peak that effectively impacts in the channel impulse response.
Channel impulse response waveform, channel estimation window and time slot desired value that above-mentioned synchronous control command generation unit 108 can generate by starting point, end point and the peak point information with above-mentioned accurate measurement compare and generate above-mentioned synchronous control command.
Above-mentioned synchronous control command can be sent to corresponding user equipment in this subframe or next subframe.
And, can be kept in the above-mentioned main control unit 112 with the form of random access memory through the mapping of above-mentioned synch command and filler cells 110 mapped data results.
Above-mentioned synch command mapping and filler cells 110 are before shining upon, the ascending time slot that subscriber equipment uses is numbered in above-mentioned uplink synchronous tracking device outside, and the synchronous adjustment character position that can fill synchronous control command in the descending time slot that uses of above-mentioned subscriber equipment is numbered.
The parameter that above-mentioned main control unit 112 is handled comprises above-mentioned uplink synchronous tracking device and outside input, output parameter interface, and the exchanges data between inner each subelement of device.
For each subscriber equipment, above-mentioned two times of interpolations in the above-mentioned uplink synchronous tracking device and power averaging unit 102, bigness scale unit 104, four times of interpolations and accurate measurement unit 106, synchronous control command generation unit 108 and synch command are hinted obliquely at filler cells 110 orders and are sent separately dispatching command, and after finishing dealing with, sending the sign of finishing dealing with to above-mentioned main control unit 112, above-mentioned main control unit 112 carries out data necessary according to the above-mentioned sign of finishing dealing with and handles the next unit of startup, back.
Particularly, according to agreement, in order to keep synchronous, the degree of regulation of time is 1/8chip, therefore need carry out 8 samplings to the sampled point based on spreading rate that channel estimating obtains.As shown in Figure 1, in order to reduce operand, this synchronous follow-up device can be divided into the mapping of two times of interpolations in following six unit and power averaging unit 102, bigness scale unit 104, four times of interpolations and accurate measurement unit 106, synchronous control command generation unit 108, synch command and filler cells 110, main control unit 112.The octuple sampling is finished by two times of interpolations and four times of interpolation cascades.
The channel impulse response that is input to uplink synchronous tracking device is the midamble sign indicating number (intermediate code that the base station receives a time slot of UE transmission, down with) obtain the data of 128 chip lengths after average, include the channel impulse response information of all users in this time slot.
Under the control of main control unit 112, carry out the synchronous tracking processing of each UE in the time slot.
Wherein, two times of interpolations and power averaging unit 102 carry out two times of linear interpolations to this impulse response after taking out the efficient channel impulse response of each UE, after then the power of each point being averaged according to antenna, deliver to bigness scale unit 104; Bigness scale unit 104 finds starting point above thresholding (point that promptly surpasses power threshold the earliest), end point (point that promptly surpasses power threshold the latest) and peak point (prominent point) according to the certain power thresholding, then these information is delivered to four times of interpolations and accurate measurement unit 106; Four times of interpolations and accurate measurement unit 106 carry out four times of interpolations respectively near starting point, end point and peak point, find four times of starting point, end point and peak points after the interpolation, this moment precision be the octuple interpolation, then with accurate measurement to starting point, end point and peak point information deliver to synchronous control command generation unit 108; Information that synchronous control command generation unit 108 arrives according to accurate measurement and the information of preserving according to history and desired value form Synchronization Control then according to certain rule order is in advance, delays or keep; The mapping of synch command and filler cells 110 are mapped to synchronous control command in the corresponding descending time slot and go.
This uplink synchronous tracking device all calls finish channel estimating in each ascending time slot after.The synchronous control command that produces is issued among the corresponding UE in this subframe or next subframe.
Next, will each unit of uplink synchronous tracking device of the present invention be elaborated respectively.
(1) two times of interpolation and power averaging unit 102:
Two times of interpolations and power averaging unit 102 at first obtain the Midamble sign indicating number skew original position of the UE of current activation from signaling processing module, effectively the skew of Midamble sign indicating number can have a plurality ofly, for the sake of simplicity, now only gets first.
What choose the road through is that CIR sequence (channel impulse response sequence, down together) carries out generating the interpolation point sequence after the twice interpolation.Interpolation point is obtained by each 3 weighted sums to interpolation factor before and after it.
To the sequence after the above-mentioned twice interpolation many groups should be arranged, one group of every reception antenna calculates power on each antenna to each sampling point of this sequence, forms a CIR power sequence, then to all antenna powers be averaged.
(2) the bigness scale unit 104:
At first, bigness scale unit 104 obtains the power threshold of time delay bigness scale.According to the signal interference ratio threshold value of upper-layer parameters configuration, obtain the power number of signal interference ratio thresholding, with its average interference power that multiply by tap, obtain the power threshold of time delay bigness scale.Performance number surpasses the sampling point of this thresholding and does not then think noise.
Secondly, the scanning front power calculation CIR power points sequence of trying to achieve have a few:
A) get first point the time started of power wherein for effectively impacting in the channel impulse response greater than power threshold;
B) get last point the concluding time of power wherein for effectively impacting in the channel impulse response greater than power threshold;
Then, get wherein continuous 2 points (as a, b) power sum maximum and its power more preceding (a) time to peak for effectively impacting in the channel impulse response greater than power threshold.
Wherein, the sampled point precision that obtains of bigness scale is two sampling values.
(3) four times of interpolations and accurate measurement unit 106:
The accurate measurement of four times of interpolations and accurate measurement unit 106 was finished by four times of interpolation and two steps of time delay accurate measurement.
If time started, concluding time, peak are denoted as Start, End, Peak, then for the certainty of measurement of the time delay accurate measurement that reaches 1/8chip, need between Start and the Start-1, between End and the End+1, carry out four times interpolation between Peak and the Peak+1.Interpolation method is with two times of interpolation, and the insertion point is still obtained by each 3 weighted sums to interpolation factor before and after it).
The power threshold of utilizing the time delay bigness scale to calculate equally, four times of interpolating sequences of scan power point have a few:
A) get first point the time started (Start is the octuple sampled point) of power wherein for effectively impacting among the CIR greater than power threshold;
B) get last point the concluding time (End is the octuple sampled point) of power wherein for effectively impacting among the CIR greater than power threshold;
C) getting power maximum wherein and its power is the time to peak (Peak is the octuple sampled point) that effectively impacts among the CIR greater than the point of power threshold.
(4) the synchronous control command generation unit 108:
CIR waveform that the above-mentioned measurement of synchronous control command generation unit 108 usefulness produces and channel estimation window and time slot desired value relatively can produce synchronous control command.
Synchronous tracking system essence is a kind of closed-loop control system, and its controlled target is that the channel impulse response with the user is limited in the channel window, and the peak value of impulse response should approach the target location of setting, can adopt based on adaptive control algorithm.
Synchronous control command is exactly according to starting point Start, end point End and peak point Peak with channel impulse response of 1/8 sampling precision, and the factors such as historical information of former frames of this UE, adopt different control strategies and the synchronous control command SS of the protocol compliant that produces regulation.
Judge at first whether starting point and end point exceed in the channel impulse response window, then according to exit window and not the situation of exit window handle respectively, simultaneously also need be from a plurality of Control Parameter on upper strata.
(5) mapping of synch command and filler cells 110:
At first, the mapping of synch command and filler cells 110 shine upon processing to each ascending time slot of each UE.This system need open up a memory cell and preserve the synchronous control command that each ascending time slot of the current subframe of this UE calculates.
UE produces synchronous control command at each ascending time slot of subframe, when subframe numbers SubSfn is adjusted frequency and divides exactly, issues new SS symbol, carries out the SS mapping.
On the SS character position that SS mapping is exactly synchronous control command mapping (inserting) that ascending time slot is produced in the descending time slot.Before mapping, need to finish following two steps work:
The ascending time slot that UE is used is numbered in this system outside and carries out, such as being finished by signaling processing module; The SS character position that can fill out synchronous control command in the descending time slot to this UE use is numbered.
The SS mapping is to insert corresponding UL_SC order on the SS character position with transmission on the current descending time slot.
Consider that when wireless link reconfigured, the mapping of SS has also changed, so this time, SS needed the mapping of reforming, and the value of SS is changed to 0x81 when reprovision, does not promptly move.
(6) main control unit 112:
Wherein, interface parameters comprises this device and outside input, output parameter interface, and the exchanges data between inner each subelement.These parameters and data preserve with the form of single port RAM and dual port RAM.
Before this device started, following the tracks of the channel impulse response data that will use a system parameters and a time slot in the processing procedure synchronously don't fail to be ready to, and is written among the special RAM.Externally under Ming Ling the control, start main control unit 112, will write among the RAM parameter and carry out simple process, be convenient to be distributed to a subelement.
Data result after the mapping that obtains at last will be kept at the form of RAM in the main control unit 112, for other module accesses.
The scheduling of five unit, front is finished in this main control unit 112, to each UE, sends dispatching command separately in order.After each cell processing is finished, all produce the sign of finishing dealing with and give main control unit 112, main control unit 112 carries out data necessary and handles the next unit of startup, back according to this sign.
Arrive this, the structure shown in Fig. 1 realizes a hardware unit that is used for TD-SCDMA system uplink synchronization tracking.
The uplink synchronous tracking device that the following describes is used for the digital baseband processing system of TD-SCDMA base station, finishes in uplink processing module the data after the channel estimating of eight antennas are handled.
Suppose three carrier waves of Base-Band Processing veneer processing of a base station, then finish the synchronous tracking processing of all three carrier waves with this device.These three carrier waves are serial process, after this device is finished a carrier wave, because this resume module speed is fast, will wait for the processing that starts next carrier wave, until the processing of finishing three carrier waves.
In a time slot, the maximum number of UE is made as 8, promptly will finish eight subsynchronous tracking at most and handle in a time slot.The channel impulse response sequence of eight antennas of each UE is the individual data of 128 * 8=1024 (1K), and eight UE are 8K data, all write among the RAM.
After this contrive equipment starts, after the main control unit that started this device before this is distributed to the port of each unit with the parameter of a carrier wave, after judging the UE that need to handle, beginning starts the mapping and the filler cells of two times of interpolations and power averaging unit, bigness scale unit, four times of interpolations and accurate measurement unit, synchronous control command generation unit and synch command successively.
Second embodiment
Fig. 2 is the general flowchart according to the uplink synchronization tracking method of present embodiment;
As shown in Figure 2, uplink synchronization tracking method of the present invention may further comprise the steps: first step S200, read the pairing channel impulse response sequence of subscriber equipment first intermediate code in time slot, carry out two times of interpolations, and the average estimated channel power after the interpolation is averaged by antenna number; The second step S202, according to the noise gate that calculates gained, the elimination noise obtains starting point, end point and the peak point of two sampling precision; Third step S204 according to above-mentioned starting point, end point and the peak point of the bigness scale that obtains, carries out four times of interpolations respectively in its vicinity in the above-mentioned second step S202, obtain four times of starting point, end point and peak points after the interpolation; The 4th step S206 produces synchronous control command according to the above-mentioned starting point after four times of interpolations that generate, end point and peak point in above-mentioned third step S204; And the 5th step S208, the above-mentioned Synchronization Control signaling that will produce in above-mentioned the 4th step S206 is mapped in the downlink processing module.
In above-mentioned third step S204, starting point, end point and peak point after above-mentioned four times of interpolations can have the octuple sampling precision.
In above-mentioned the 4th step S206, can be further produce above-mentioned synchronous control command according to the historical information of former frames of above-mentioned subscriber equipment.
Above-mentioned synchronous control command can be sent to corresponding user equipment in this subframe or next subframe.
Before above-mentioned first step S200, may further include following steps: steps A: carry out system configuration, and preserve the channel impulse response of all subscriber equipmenies of time slot; Step B: judge whether to exist the subscriber equipment of activation,, then start the synch command that above-mentioned subscriber equipment is carried out and calculate if there is the subscriber equipment that activates.
Before above-mentioned the 5th step S208, may further include following steps: step C: judge whether that all activated subscriber equipment in the above-mentioned time slot has all carried out synchronous tracking processing.
Particularly, as shown in Figure 3, the specific implementation step of uplink synchronization tracking method comprises:
(1) carries out the channel impulse response that system parameters disposed and preserved all UE of this time slot;
(2) judge whether the UE of activation,, just begin to start the calculating of this UE being carried out synch command in case the UE of activation is arranged;
(3) read first the Midmable sign indicating number pairing channel impulse response sequence of this UE in this time slot, carry out two times of interpolations, the average estimated channel power after the interpolation is averaged by antenna number;
(4) according to the noise gate that calculates gained, the elimination noise obtains starting point Start, end point End and the peak point Peak of two sampling precision;
(5) starting point Start, end point End and the peak point Peak of the bigness scale that obtains according to two times of interpolations carry out four times of interpolations respectively in its vicinity, obtain starting point Start, end point End and the peak point Peak of octuple sampling precision altogether;
(6) according to having starting point Start, end point End and the peak point Peak of the channel impulse response of octuple sampling precision, and the factors such as historical information of former frames of this UE, adopt different control strategies and the synchronous control command SS that produces.
(7) synchronous control command that step (6) is produced is mapped in the downlink processing module.
(8) judge whether all activated UE in this time slot has all carried out synchronous tracking and handled, if, show that then this synchronous follow-up device finished the operation of a time slot, wait the operation of pending next time slot; Otherwise, repeating step (2) is arrived step (7).
Other parts of present embodiment are all identical with first embodiment, so just repeat no more at this.
According to the present invention, five unit in the uplink synchronous tracking device carry out five steps in the uplink synchronization tracking method with a UE, are (as shown in Figure 4) that serial is carried out on time sequencing.Therefore for processing time of the synchronous tracking that reduces each UE, can adopt the mode of streamline to carry out, such as going on foot at second of a UE of execution, the first step of another UE that can bring into operation so can cause occurring the problem that needs increase the data space between the unit.But the data that each intermodule need exchange are little, so this scheme can significantly shorten the processing time increasing under the little situation of hardware size, given full play to software and realized not available advantage.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a uplink synchronous tracking device is characterized in that, comprising:
Two times of interpolations and power averaging unit are used for two times of linear interpolations are carried out in the efficient channel impulse response of each subscriber equipment, and the power of each point are averaged according to antenna;
The bigness scale unit is connected to described two times of interpolations and power averaging unit, is used to obtain the power threshold of time delay bigness scale, and finds starting point, end point and the peak point that surpasses described threshold value;
Four times of interpolations and accurate measurement unit are connected to described bigness scale unit, are used for carrying out near the described starting point, end point and the peak point that are provided by described bigness scale unit respectively four times of interpolations, obtain four times of starting point, end point and peak points after the interpolation;
The synchronous control command generation unit is connected to described four times of interpolations and accurate measurement unit, be used for according to the accurate measurement that provides by described four times of interpolations and accurate measurement unit to starting point, end point and peak point information generate synchronous control command;
Synch command mapping and filler cells are connected to described synchronous control command generation unit, are used for described synchronous control command is mapped to corresponding descending time slot; And
Main control unit, be connected to described two times of interpolations and power averaging unit, bigness scale unit, four times of interpolations and accurate measurement unit, synchronous control command generation units and synch command is hinted obliquely at and filler cells, be used for above-mentioned each unit is dispatched and control connection, and carry out interface parameters and handle.
2. uplink synchronous tracking device according to claim 1 is characterized in that, described bigness scale unit with power greater than first point of described power threshold for starting point, that is, and the time started of effectively impacting in the channel impulse response; Power last greater than described power threshold put as end point, that is, and the concluding time of effectively impacting in the channel impulse response; Is peak point with continuous 2 power sum maximums and power greater than the more preceding of described power threshold, that is, and and the time to peak that effectively impacts in the channel impulse response.
3. uplink synchronous tracking device according to claim 1, it is characterized in that channel impulse response waveform, channel estimation window and time slot desired value that described synchronous control command generation unit generates by starting point, end point and peak point information with described accurate measurement compare and generate described synchronous control command.
4. uplink synchronous tracking device according to claim 3 is characterized in that, described synchronous control command is sent to corresponding user equipment in this subframe or next subframe.
5. uplink synchronous tracking device according to claim 1 is characterized in that, is kept in the random access memory in the described main control unit through the mapping of described synch command and filler cells mapped data result.
6. uplink synchronous tracking device according to claim 1, it is characterized in that, described synch command mapping and filler cells are before shining upon, the ascending time slot that subscriber equipment uses is numbered in described uplink synchronous tracking device outside, and the synchronous adjustment character position that can fill synchronous control command in the descending time slot that uses of described subscriber equipment is numbered.
7. uplink synchronous tracking device according to claim 1 is characterized in that, the parameter that described main control unit is handled comprises described uplink synchronous tracking device and outside input, output parameter interface, and the exchanges data between inner each subelement of device.
8. uplink synchronous tracking device according to claim 1, it is characterized in that, for each subscriber equipment, described two times of interpolations in the described uplink synchronous tracking device and power averaging unit, bigness scale unit, four times of interpolations and accurate measurement unit, synchronous control command generation unit and synch command are hinted obliquely at the filler cells order and are sent separately dispatching command, and after finishing dealing with, sending the sign of finishing dealing with to described main control unit, described main control unit carries out data necessary according to the described sign of finishing dealing with and handles the next unit of startup, back.
9. a uplink synchronization tracking method is characterized in that, may further comprise the steps:
First step reads the pairing channel impulse response sequence of subscriber equipment first intermediate code in time slot, carries out two times of interpolations, and the average estimated channel power after the interpolation is averaged by antenna number;
Second step, according to the noise gate that calculates gained, the elimination noise obtains starting point, end point and the peak point of two sampling precision;
Third step according to described starting point, end point and the peak point of the bigness scale that obtains, carries out four times of interpolations respectively in its vicinity in described second step, obtain four times of starting point, end point and peak points after the interpolation;
The 4th step produces synchronous control command according to the described starting point after four times of interpolations that generate, end point and peak point in described third step; And
The 5th step, the described synchronous control command that will produce in described the 4th step is mapped in the downlink processing module.
10. uplink synchronization tracking method according to claim 9 is characterized in that, in described third step, starting point, end point and peak point after described four times of interpolations have the octuple sampling precision.
11. uplink synchronization tracking method according to claim 9 is characterized in that, in described the 4th step, further the historical information according to former frames of described subscriber equipment produces described synchronous control command.
12. uplink synchronization tracking method according to claim 11 is characterized in that, described synchronous control command is sent to corresponding user equipment in this subframe or next subframe.
13. uplink synchronization tracking method according to claim 9 is characterized in that, before described first step, further may further comprise the steps:
Steps A: carry out system configuration, and preserve the channel impulse response of all subscriber equipmenies of time slot;
Step B: judge whether to exist the subscriber equipment of activation,, then start the synch command that described subscriber equipment is carried out and calculate if there is the subscriber equipment that activates.
14. uplink synchronization tracking method according to claim 9 is characterized in that, before described the 5th step, further may further comprise the steps:
Step C: judge whether that all activated subscriber equipment in the described time slot has all carried out synchronous tracking processing.
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| CN1264228A (en) * | 2000-02-01 | 2000-08-23 | 深圳市中兴通讯股份有限公司 | Automatic frequency control method and device in broadband CDMA system |
| CN1741395A (en) * | 2004-08-23 | 2006-03-01 | 中兴通讯股份有限公司 | Special up channel frequency deviation estimating method in code division multiplexing address system |
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| CN1264228A (en) * | 2000-02-01 | 2000-08-23 | 深圳市中兴通讯股份有限公司 | Automatic frequency control method and device in broadband CDMA system |
| CN1741395A (en) * | 2004-08-23 | 2006-03-01 | 中兴通讯股份有限公司 | Special up channel frequency deviation estimating method in code division multiplexing address system |
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