CN102665269B - Symbol timing synchronization method and symbol timing synchronization system - Google Patents
Symbol timing synchronization method and symbol timing synchronization system Download PDFInfo
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Abstract
The invention provides a symbol timing synchronization method. The method comprises the steps of determining a distance between a master synchronization signal and an uplink signal; determining length of detection windows, wherein the length of the detection windows is less than or equal to the distance between the master synchronization signal and the uplink signal; determining quantity of the detection windows according to length of a master synchronization signal time-domain correlative sequence and the length of the detection windows; calculating a peak-to-average power ratio of each of the detection windows; and selecting the maximum value from all the peak-to-average power ratios, and achieving symbol timing synchronization by determining the position of the maximum value as the timing synchronization position. The invention also provides a symbol timing synchronization system implementing the method. By the aid of the symbol timing synchronization method and the symbol timing synchronization system, symbol timing synchronization can be accurately achieved during initial cell search.
Description
Technical field
The application relates to wireless signal processing technology field, particularly relates to a kind of symbol timing synchronization method and system.
Background technology
Development along with mobile communication and wireless access wide band technology, Long Term Evolution LTE (Long Term Evolution) technology is with its high transfer rate, the advantages such as little user plane latency and support terminal high-speed mobile, become the mainstream technology that next-generation mobile communications develop.For cell mobile communication systems, cell initial search is the first step of mobile terminal access of radio network, is one of the most basic flow process of physical layer.When terminal is started shooting access community or handover first, need to carry out cell initial search and set up Time and Frequency Synchronization, obtain physical-layer cell identifier and other system configuration information, behind access community, terminal could receive cell system message, connects, and communicates process.
The P-SCH that cell initial search is received by detection and S-SCH obtain the parameters such as descending sign synchronization position, thick frequency deviation estimation, CP type, community ID.Wherein, P-SCH is upper, and that send is PSC (master sync signal, Primary Synchronization Code), the upper transmission of S-SCH be SSC (auxiliary synchronous signal, Secondary Synchronization Code).Cell initial search is according to the single search data length of a field, by P-SCH, adopts local synchronization Serial relation to carry out that timing synchronization detects and sector ID detects, and by S-SCH, carries out cell set ID and CP type detection.
Wherein, it is the PSC Serial relation with local storage by the reception signal after down-sampling that timing synchronization detects, and obtains three correlated results set.Find out the maximum in each correlated results set, and relatively these three values are big or small, wherein, the PSC sequence that PSC sequence corresponding to maximum is transmission, the position at maximum place is Timing Synchronization position, completes timing synchronization and detects.
But in aforementioned timing synchronization testing process, owing to receiving, number of signals is larger, need to carry out respectively relevant by receiving signal to the master sync signal sequence of local three frequency domains simultaneously.Terminal is when carrying out cell initial search, if while there is the strong jamming of uplink service signal, in half frame data that receive in the time of can causing the terminal of cell initial search to carry out PSC Timing Synchronization, upward signal is far longer than downstream signal, at this moment adopt the relevant Timing Synchronization of aforesaid PSC to get peaked method, descending sign synchronization position performance cannot guarantee, cell initial search cannot complete symbol timing detection accurately, there is deviation in timing estimation value, affect signal access precision and efficiency, at handover, especially under high-speed mobile environment, can increase cutting off rate.
Summary of the invention
The application provides a kind of symbol timing synchronization method and system, can solve the problem that cell initial search cannot accurately be realized timing synchronization.
In order to address the above problem, the application discloses a kind of symbol timing synchronization method, comprises the following steps:
Determine the distance of master sync signal and upward signal;
Determine the length of detection window, the length of described detection window is less than or equal to the distance of described master sync signal and upward signal;
Length based on master sync signal time domain correlated series and the length of detection window are determined detection window quantity;
Calculate the peak-to-average power ratio of each detection window;
Choosing the maximum in all peak-to-average power ratios, is that timing synchronization is realized in Timing Synchronization position by the location positioning at its place.
Further, the distance of described definite master sync signal and upward signal comprises:
Obtain special subframe configuration and uplink-downlink configuration;
According to described special subframe configuration and uplink-downlink configuration query configuration table, determine upward signal and downstream signal length;
According to the distance of described upward signal and downstream signal length computation master sync signal and upward signal.
Further, the length of described definite detection window, the distance that the length of described detection window is less than or equal to described master sync signal and upward signal comprises:
Counting after orthogonal frequency division multiplexi down-sampling is defined as to the length of detection window.
Further, described length based on master sync signal time domain correlated series and the length of detection window determine that detection window quantity comprises:
Length by the length of master sync signal time domain correlated series divided by detection window, if aliquot, detection window quantity is the two total after being divided by, if aliquant, detection window quantity for the two be divided by after the integer part of total add 1.
Further, the peak-to-average power ratio of described each detection window of calculating comprises:
Determine the maximum in each detection window;
Calculate the mean value in each detection window;
According to the peak-to-average power ratio of maximum and each detection window of mean value calculation.
Further, the described peak-to-average power ratio according to maximum and each detection window of mean value calculation comprises:
Relatively the mean value of two detection window of current detection window left and right sides size, chooses the detection window that mean value is larger; If a current detection window only side has detection window, relatively the mean value of current detection window and a described side detection window is big or small, chooses the detection window that mean value is larger;
Mean value by the maximum of current detection window divided by the larger detection window of the described mean value of choosing, obtains the peak-to-average power ratio of current detection window.
Further, the described peak-to-average power ratio according to maximum and each detection window of mean value calculation comprises:
By the maximum in current detection window, respectively divided by the mean value of two detection window of this detection window left and right sides, choose value that total is less as the peak-to-average power ratio of current detection window;
If a current detection window only side has detection window, use maximum in current detection window respectively divided by the mean value of current detection window and a described side detection window, choose value that total is less as the peak-to-average power ratio of current detection window.
In order to address the above problem, disclosed herein as well is a kind of timing synchronization system, comprising:
Apart from determination module, for determining the distance of master sync signal and upward signal;
Detection window length determination module, for determining the length of detection window, the length of described detection window is less than or equal to the distance of described master sync signal and upward signal;
Detection window quantity determination module, determines detection window quantity for the length of the length based on master sync signal time domain correlated series and detection window;
Peak-to-average power ratio computing module, for calculating the peak-to-average power ratio of each detection window;
Timing Synchronization module, for choosing the maximum of all peak-to-average power ratios, is that timing synchronization is realized in Timing Synchronization position by the location positioning at its place.
Further, describedly apart from determination module, comprise:
Configuration acquiring unit, for obtaining special subframe configuration and uplink-downlink configuration;
Uplink and downlink signals length query unit, for determining upward signal and downstream signal length according to described special subframe configuration and uplink-downlink configuration query configuration table;
Metrics calculation unit, for according to the distance of described upward signal and downstream signal length computation master sync signal and upward signal.
Further, described detection window length determination module is defined as counting after orthogonal frequency division multiplexi down-sampling the length of detection window.
Further, described detection window quantity determination module comprises:
Computing unit, for the length divided by detection window by the length of master sync signal time domain correlated series, if aliquot, detection window quantity is the two total after being divided by, if aliquant, detection window quantity for the two be divided by after the integer part of total add 1.
Further, described peak-to-average power ratio computing module comprises:
Maximum determining unit, for determining the maximum in each detection window;
Average calculation unit, for calculating the mean value in each detection window;
Peak-to-average power ratio computing unit, for according to the peak-to-average power ratio of maximum and each detection window of mean value calculation
Further, described peak-to-average power ratio computing unit comprises:
Mean value is subelement relatively, for comparing the mean value size of two detection window of the current detection window left and right sides, chooses the detection window that mean value is larger; If a current detection window only side has detection window, relatively the mean value of current detection window and a described side detection window is big or small, chooses the detection window that mean value is larger; And by the maximum of current detection window the mean value divided by the larger detection window of the described mean value of choosing, obtain the peak-to-average power ratio of current detection window.
Further, described peak-to-average power ratio computing unit comprises:
Peak-to-average power ratio is subelement relatively, for the maximum with in current detection window, respectively divided by the mean value of two detection window of this detection window left and right sides, chooses value that total is less as the peak-to-average power ratio of current detection window; If a current detection window only side has detection window, use maximum in current detection window respectively divided by the mean value of current detection window and a described side detection window, choose value that total is less as the peak-to-average power ratio of current detection window.
Compared with prior art, the application comprises following advantage:
The application's symbol timing synchronization method and system, by the peak-to-average power ratio after utilizing master sync signal time domain relevant, calculate maximizing position, complete descending timing synchronization, even if exist in up user's strong jamming situation, although a little less than downstream signal, peak-to-average power ratio is still large than the peak-to-average power ratio of the signal of uplink interference, therefore can determine exactly the position of Timing Synchronization, realize timing synchronization, thereby improve the success rate of cell initial search.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the application's symbol timing synchronization method embodiment mono-;
Fig. 2 is the schematic diagram of frame structure in the application's symbol timing synchronization method embodiment;
Fig. 3 is the schematic diagram of master sync signal slip correlated process in the application's symbol timing synchronization method embodiment;
Fig. 4 is the structural representation of the application's timing synchronization system embodiment one.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, the every other embodiment that those of ordinary skills obtain, belongs to the scope that the application protects.
With reference to Fig. 1, a kind of symbol timing synchronization method embodiment mono-of the application is shown, comprise the following steps:
Step 101, determines the distance of master sync signal and upward signal.
With reference to Fig. 2, a kind of frame structure is shown, the length of this frame structure is 10ms, comprises 2 fields, comprises five subframes (subframe 0 arrives subframe 9 to subframe 4 and subframe 5) in each field, one of them is special subframe (subframe 1 and subframe 6).Descending time slot (DwPTS in special subframe; downstream signal), protection time slot (GP; guard signal) and ascending time slot (UpPTS; upward signal) total length is fixed as 30720Ts; the part that master sync signal (PSC) is downstream signal, is designated 2 part in figure.Distance between master sync signal and upward signal refers in downstream signal the length of part after master sync signal and the length sum of guard signal, in Fig. 2, is denoted as 3,4,5 and the tetrameric length sum of GP.The length of upward signal and downstream signal can configure, and when special subframe configuration is different with uplink-downlink configuration, its upward signal and downstream signal length are also different.Concrete upward signal and the length of downstream signal can obtain by question blank 1-special subframe allocation list after obtaining special subframe configuration and uplink-downlink configuration.After having determined the length of upward signal and downstream signal, can calculate the length of guard signal.Because fix to the length of master sync signal from starting in downstream signal, 0,1,2 the length indicating in Fig. 2 is fixed, 0 and 1 length and be 4440Ts wherein, and 2 length is 2192Ts, three's length sum is 6592Ts.Therefore; after determining downstream signal length according to special subframe configuration and uplink-downlink configuration; just can calculate the length of part after master sync signal in downstream signal, and then calculate the distance between master sync signal and upward signal in conjunction with the length gauge of aforementioned guard signal.
Table 1 special subframe allocation list
For example, when special subframe is configured to 8, during upper behavior extended cyclic prefix configuration, question blank 1 can determine that upward signal length is 5120Ts, and downstream signal length is 24144Ts.According to calculating, can show that guard signal length is 30720Ts-24144Ts-5120Ts=1456Ts.In downstream signal, after master sync signal, the length of part is 24144Ts-6592Ts=17552Ts, thereby the distance of determining between master sync signal and upward signal is 17552Ts+1456Ts=19008Ts.
Step 102, determines the length of detection window, and the length of described detection window is less than or equal to the distance of described master sync signal and upward signal.
The length of detection window mainly determines according to the distance of master sync signal and upward signal, as long as guarantee that master sync signal and upward signal be not in a detection window.In the application, the distance that the length by detection window is set to be less than master sync signal and upward signal guarantees that master sync signal and upward signal be not in a detection window.
Further, when determining the length of detection window, it is also conceivable that (the Orthogonal Frequency Division Multiplexing through OFDM, orthogonal frequency division multiplexi) counting after down-sampling, generally, for the ease of calculating, counting after OFDM down-sampling can be defined as to the length of detection window.
Step 103, the length based on master sync signal time domain correlated series and the length of detection window are determined detection window quantity.
Master sync signal time domain correlated series refers to the master sync signal Serial relation with local storage by the reception signal r (n) after down-sampling, the relevant convolution that is, 128 local master sync signal time-domain signals are by the window of 128, in reception data, smoothly move, (rectangular blocks that comprises oblique line that is wherein positioned at below represents 128 local master sync signals as shown in Figure 3, arrow represents moving direction), and then many reception antenna correlated results are merged.Local u (0,1,2) is individual, and three frequency domain master sync signal sequences respectively zero padding are s through inverse discrete Fourier transformer inverse-discrete to time domain postscript
i(n), n=0,1..., 127; I=0,1,2, do and slide relevantly to reception signal r (n) after down-sampling respectively, as shown in Figure 3, record the data bit r (n) in sliding window, n=0,1..., 127, obtain three correlated serieses:
These three correlated serieses are the power value sequence of master sync signal time domain correlated series, and the length of each master sync signal time domain correlated series is fixed value 9600.Because its length is fixed value, after having determined the length of detection window, can determine the quantity of detection window.The quantity of detection window be the length of master sync signal sequential correlated series divided by the length of detection window, if can divide exactly, detection window quantity is the two total after being divided by, if can not, the quantity of detection window adds 1 for the integer part of the two total after being divided by.
Step 104, calculates the peak-to-average power ratio of each detection window.
Calculate the peak-to-average power ratio of each detection window in the following way:
Determine the maximum (peak value) in each detection window;
Calculate the mean value in each detection window;
According to the peak-to-average power ratio of maximum and each detection window of mean value calculation.
Wherein, according to the peak-to-average power ratio of maximum and each detection window of mean value calculation, can calculate in the following way:
Relatively the mean value of two detection window of current detection window left and right sides size, chooses the detection window that mean value is larger; If a current detection window only side has detection window, relatively the mean value of current detection window and a described side detection window is big or small, chooses the detection window that mean value is larger;
Mean value by the maximum of current detection window divided by the larger detection window of the described mean value of choosing, obtains the peak-to-average power ratio of current detection window.
Be appreciated that and can also calculate in the following way:
By the maximum in current detection window, respectively divided by the mean value of two detection window of this detection window left and right sides, choose value that total is less as the peak-to-average power ratio of current detection window;
If a current detection window only side has detection window, use maximum in current detection window respectively divided by the mean value of current detection window and a described side detection window, choose value that total is less as the peak-to-average power ratio of current detection window.
That is, for first detection window, because left side does not have detection window, use the maximum of the first detection window respectively divided by the mean value of the first detection window and the second detection window, get the smaller value of the two as the peak-to-average power ratio of the first detection window.For last detection window, because right side does not have detection window, use the maximum of last detection window respectively divided by the mean value of last detection window and penultimate detection window, get the smaller value of the two as the peak-to-average power ratio of last detection window.
Suppose that detection window is k, max_P (k) represents the maximum of k detection window, and mean_P (k) represents the mean value of k detection window.So,
The peak-to-average power ratio PAPR (k) of first detection window is:
The peak-to-average power ratio PAPR (k) of last detection window is:
The peak-to-average power ratio PAPR (k) of other position probing windows is:
Step 105, chooses the maximum in all peak-to-average power ratios, by the location positioning at its place, is that timing synchronization is realized in Timing Synchronization position.
Below in conjunction with instantiation, preceding method is elaborated.Suppose that special subframe is configured to 8 and upper behavior extended cyclic prefix configuration.So, master sync signal and upward signal distance are 19008Ts, are 1188 points after down-sampling, so the detection window length of choosing must not surpass 1188.Cell initial search counting after OFDM down-sampling is 128 points, and for the ease of calculating, it is length=128 that detection window length is set here.
According to as aforementioned formula (1-1), the performance number of field master sync signal correlated series after cell initial search down-sampling, length is 9600, therefore, the quantity that can obtain detection window is, 9600/128=75.
75 detection window according to arranging, can obtain 75 peak values in detection window altogether, and establishing detection window is k, k=1, and 2...75, the maximum in each detection window is according to formula (2-1):
[max_P(k)，Δ]＝max(P((k-1)*length+1)，P((k-1)*length+2)，...，P((k)*length)) (2-1)
Δ is the position of peak-peak in detection window.Calculate the mean value in each detection window, according to formula (2-2):
[mean_P(k)]＝mean(P((k-1)*length+1)，P((k-1)*length+2)，...，P((k)*length)) (2-2)
Generally, according to formula (2-3), obtain the peak-to-average power ratio of each detection window:
In particular cases, first window and last window, cannot find previous window and a rear window,
If first window calculates peak-to-average power ratio according to formula (2-4):
If last window calculates peak-to-average power ratio according to formula (2-5):
According to aforementioned result of calculation, choose the peaked position of peak-to-average power ratio as the position of Timing Synchronization, realize timing synchronization.Because the autocorrelation of master sync signal is strong, although a little less than downstream signal, peak-to-average power ratio is still large than the peak-to-average power ratio of the signal of uplink interference, therefore, this kind of mode can accurately be determined the position of Timing Synchronization, realizes timing synchronization.
In the application's symbol timing synchronization method embodiment, by the peak-to-average power ratio after utilizing master sync signal time domain relevant, calculate maximizing position, complete descending timing synchronization, even if exist in up user's strong jamming situation, although a little less than downstream signal, peak-to-average power ratio is still large than the peak-to-average power ratio of the signal of uplink interference, therefore can determine exactly the position of Timing Synchronization, realize timing synchronization, thereby improve the success rate of cell initial search.
This application's symbol timing synchronization method is not limited under single-cell environment, also comprises under the environment of common frequency multi-cell.
With reference to Fig. 4, the application's timing synchronization system embodiment is shown, comprise apart from determination module 10, detection window length determination module 20, detection window quantity determination module 30, peak-to-average power ratio computing module 40 and Timing Synchronization module 50.
Apart from determination module 10, for determining the distance of master sync signal and upward signal.Preferably, this comprises configuration acquiring unit, uplink and downlink signals length query unit and metrics calculation unit apart from determination module 10.Configuration acquiring unit, for obtaining special subframe configuration and uplink-downlink configuration.Uplink and downlink signals length query unit, for determining upward signal and downstream signal length according to described special subframe configuration and uplink-downlink configuration query configuration table.Metrics calculation unit, for according to the distance of described upward signal and downstream signal length computation master sync signal and upward signal.
Detection window length determination module 20, for determining the length of detection window, the length of described detection window is less than or equal to the distance of described master sync signal and upward signal.Preferably, detection window length determination module 20 is defined as counting after orthogonal frequency division multiplexi down-sampling the length of detection window.
Detection window quantity determination module 30, determines detection window quantity for the length of the length based on master sync signal time domain correlated series and detection window.Preferably, detection window quantity determination module 30 comprises computing unit, for the length divided by detection window by the length of master sync signal time domain correlated series, if aliquot, detection window quantity is the two total after being divided by, if aliquant, detection window quantity for the two be divided by after the integer part of total add 1.
Peak-to-average power ratio computing module 40, for calculating the peak-to-average power ratio of each detection window.Preferably, peak-to-average power ratio computing module 40 comprises maximum determining unit, average calculation unit and peak-to-average power ratio computing unit.Maximum determining unit, for determining the maximum in each detection window.Average calculation unit, for calculating the mean value in each detection window.Peak-to-average power ratio computing unit, for according to the peak-to-average power ratio of maximum and each detection window of mean value calculation.
Wherein, peak-to-average power ratio computing unit can comprise relatively subelement of mean value, for comparing the mean value size of two detection window of the current detection window left and right sides, chooses the detection window that mean value is larger; If a current detection window only side has detection window, relatively the mean value of current detection window and a described side detection window is big or small, chooses the detection window that mean value is larger; And by the maximum of current detection window the mean value divided by the larger detection window of the described mean value of choosing, obtain the peak-to-average power ratio of current detection window.Be appreciated that, peak-to-average power ratio computing unit can also comprise relatively subelement of peak-to-average power ratio, for the maximum with in current detection window, respectively divided by the mean value of two detection window of this detection window left and right sides, choose value that total is less as the peak-to-average power ratio of current detection window; If a current detection window only side has detection window, use maximum in current detection window respectively divided by the mean value of current detection window and a described side detection window, choose value that total is less as the peak-to-average power ratio of current detection window.
Timing Synchronization module 50, for choosing the maximum of all peak-to-average power ratios, is that timing synchronization is realized in Timing Synchronization position by the location positioning at its place.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, each embodiment stresses is the difference with other embodiment.Especially, for device or system embodiment, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit as separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in a plurality of network element.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.
The symbol timing synchronization method and the system that above the application are provided are described in detail, applied specific case herein the application's principle and execution mode are set forth, the explanation of above embodiment is just for helping to understand the application's method and core concept thereof; Meanwhile, for one of ordinary skill in the art, the thought according to the application, all will change in specific embodiments and applications, and in sum, this description should not be construed as the restriction to the application.
Claims (8)
1. a symbol timing synchronization method, is characterized in that, comprises the following steps:
Determine the distance of master sync signal and upward signal;
Determine the length of detection window, the length of described detection window is less than or equal to the distance of described master sync signal and upward signal;
Length based on master sync signal time domain correlated series and the length of detection window are determined detection window quantity;
Calculate the peak-to-average power ratio of each detection window;
Choosing the maximum in all peak-to-average power ratios, is that timing synchronization is realized in Timing Synchronization position by the location positioning at its place;
Wherein, the peak-to-average power ratio of described each detection window of calculating comprises: determine the maximum in each detection window; Calculate the mean value in each detection window; According to the peak-to-average power ratio of maximum and each detection window of mean value calculation;
The described peak-to-average power ratio according to maximum and each detection window of mean value calculation comprises:
Relatively the mean value of two detection window of current detection window left and right sides size, chooses the detection window that mean value is larger; If a current detection window only side has detection window, relatively the mean value of current detection window and a described side detection window is big or small, chooses the detection window that mean value is larger; Mean value by the maximum of current detection window divided by the larger detection window of the described mean value of choosing, obtains the peak-to-average power ratio of current detection window; Or,
By the maximum in current detection window, respectively divided by the mean value of two detection window of this detection window left and right sides, choose value that total is less as the peak-to-average power ratio of current detection window; If a current detection window only side has detection window, use maximum in current detection window respectively divided by the mean value of current detection window and a described side detection window, choose value that total is less as the peak-to-average power ratio of current detection window.
2. symbol timing synchronization method as claimed in claim 1, is characterized in that, the distance of described definite master sync signal and upward signal comprises:
Obtain special subframe configuration and uplink-downlink configuration;
According to described special subframe configuration and uplink-downlink configuration query configuration table, determine upward signal and downstream signal length;
According to the distance of described upward signal and downstream signal length computation master sync signal and upward signal.
3. symbol timing synchronization method as claimed in claim 1, is characterized in that, the length of described definite detection window, and the distance that the length of described detection window is less than or equal to described master sync signal and upward signal comprises:
Counting after orthogonal frequency division multiplexi down-sampling is defined as to the length of detection window.
4. symbol timing synchronization method as claimed in claim 1, is characterized in that, described length based on master sync signal time domain correlated series and the length of detection window determine that detection window quantity comprises:
Length by the length of master sync signal time domain correlated series divided by detection window, if aliquot, detection window quantity is the two total after being divided by, if aliquant, detection window quantity for the two be divided by after the integer part of total add 1.
5. a timing synchronization system, is characterized in that, comprising:
Apart from determination module, for determining the distance of master sync signal and upward signal;
Detection window length determination module, for determining the length of detection window, the length of described detection window is less than or equal to the distance of described master sync signal and upward signal;
Detection window quantity determination module, determines detection window quantity for the length of the length based on master sync signal time domain correlated series and detection window;
Peak-to-average power ratio computing module, for calculating the peak-to-average power ratio of each detection window;
Timing Synchronization module, for choosing the maximum of all peak-to-average power ratios, is that timing synchronization is realized in Timing Synchronization position by the location positioning at its place;
Wherein, described peak-to-average power ratio computing module comprises: maximum determining unit, for determining the maximum in each detection window; Average calculation unit, for calculating the mean value in each detection window; Peak-to-average power ratio computing unit, for according to the peak-to-average power ratio of maximum and each detection window of mean value calculation;
Described peak-to-average power ratio computing unit comprises:
Mean value is subelement relatively, for comparing the mean value size of two detection window of the current detection window left and right sides, chooses the detection window that mean value is larger; If a current detection window only side has detection window, relatively the mean value of current detection window and a described side detection window is big or small, chooses the detection window that mean value is larger; And by the maximum of current detection window the mean value divided by the larger detection window of the described mean value of choosing, obtain the peak-to-average power ratio of current detection window; Or,
Peak-to-average power ratio is subelement relatively, for the maximum with in current detection window, respectively divided by the mean value of two detection window of this detection window left and right sides, chooses value that total is less as the peak-to-average power ratio of current detection window; If a current detection window only side has detection window, use maximum in current detection window respectively divided by the mean value of current detection window and a described side detection window, choose value that total is less as the peak-to-average power ratio of current detection window.
6. timing synchronization system as claimed in claim 5, is characterized in that, describedly apart from determination module, comprises:
Configuration acquiring unit, for obtaining special subframe configuration and uplink-downlink configuration;
Uplink and downlink signals length query unit, for determining upward signal and downstream signal length according to described special subframe configuration and uplink-downlink configuration query configuration table;
Metrics calculation unit, for according to the distance of described upward signal and downstream signal length computation master sync signal and upward signal.
7. timing synchronization system as claimed in claim 5, is characterized in that, described detection window length determination module is defined as counting after orthogonal frequency division multiplexi down-sampling the length of detection window.
8. timing synchronization system as claimed in claim 5, is characterized in that, described detection window quantity determination module comprises:
Computing unit, for the length divided by detection window by the length of master sync signal time domain correlated series, if aliquot, detection window quantity is the two total after being divided by, if aliquant, detection window quantity for the two be divided by after the integer part of total add 1.
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| CN101018087A (en) * | 2006-02-09 | 2007-08-15 | 大唐移动通信设备有限公司 | Downlink synchronization method and device of the mobile communication system |
| CN101447823A (en) * | 2007-11-27 | 2009-06-03 | 杰脉通信技术(上海)有限公司 | TD-SCDMA system down link synchronisation method |
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| CN1848704A (en) * | 2005-04-15 | 2006-10-18 | 展讯通信（上海）有限公司 | Cell searching method and apparatus in WCDMA system |
| CN101018087A (en) * | 2006-02-09 | 2007-08-15 | 大唐移动通信设备有限公司 | Downlink synchronization method and device of the mobile communication system |
| CN101447823A (en) * | 2007-11-27 | 2009-06-03 | 杰脉通信技术(上海)有限公司 | TD-SCDMA system down link synchronisation method |
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