CN102594395A - master synchronization sequence PSS (packet switching service) estimated value filtering method and device in cell search - Google Patents
master synchronization sequence PSS (packet switching service) estimated value filtering method and device in cell search Download PDFInfo
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Abstract
Embodiments of the invention relate to a master synchronization sequence PSS (packet switching service) estimated value filtering method and device in cell search. The method comprises the following steps of: obtaining a current PSS estimated value; comparing whether a first relevant position in the current PSS estimated value is as same as a second relevant position in a previous maximum PSS estimated value set or not; if the first relevant position is as same as the second relevant position, filtering the current PSS estimated value and the second PSS estimated value in the previous maximum PSS estimated value set; otherwise, not filtering; comparing whether a first relevant value in the current PSS estimated value or a third relevant value in the PSS estimated value after filtering is greater than the minimum value in all relevant values in the maximum PSS estimated value set or not; if the first relevant value or the third relevant value is greater than the minimum value, starting relevant position sequencing, replacing a PSS estimated value which corresponds to the minimum relevant value in the current maximum PSS estimated value set with the current PSS estimated value or the PSS estimated value after filtering, and updating relevant value indexes and relevant position indexes; and discarding the current PSS estimated value or the PSS estimated value after filtering, otherwise.
Description
Technical field
The present invention relates to communication technical field, relate in particular to main synchronizing sequence PSS detected value filtering method and device in a kind of Cell searching.
Background technology
Long Term Evolution (Long Term Evolution; LTE) project is 3G (Third Generation) Moblie technology (3rd-Generation; 3G) with the 4th third-generation mobile communication technology (4th-Generation; A 4G) transitional technology between the technology, it improves and has strengthened the aerial access technology of 3G, adopts orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing; OFDM) and multi-input multi-output antenna system (Multiple-Input Multiple-Out-put is MIMO) as the sole criterion of its wireless network evolution.
The user must at first experience cell search process when inserting a LTE sub-district, carry out synchronizing process then, obtains to make parameters such as its timing that can carry out operations such as upward signal emission and descending reception data demodulates and frequency offset estimating to guarantee the user.LTE system protocol definition has 504 unique physical-layer cells, each LTE sub-district respectively have a cell identity sign indicate number (Identity ,-ID).Sub-district ID=3*NID1+NID2; NID2=0,1,2 wherein; Corresponding respectively 3 kinds of this landlord synchronizing sequences (Primary Synchronization Sequence, PSS), NID1 value 0～167; Corresponding respectively 168 kinds of local secondary synchronization sequences (Secondary Synchronization Sequence, SSS).PSS sequence and SSS sequence have good correlation in time domain and frequency domain respectively.Except that the ID of sub-district, each LTE cell information also comprises information such as carrier frequency frequency, frame synchronization, the indication of front and back field, CP (Cyclic Prefix) type, mark frequency deviation.
LTE have FDD (Frequency Division Duplexing, FDD) and time division duplex (Time Division Duplexing, TDD) two kinds of frame formats, PSS sequence and SSS sequence are to repeat in the cycle with half radio frames (5ms) all.Cell searching is exactly the correlation that the user utilizes PSS sequence and SSS sequence, be cycle detection LTE cell information with 5ms, obtain when descending, frequently synchronous process, be divided into PSS and detect (STEP1) and detect (STEP2) two with SSS and go on foot.LTE system protocol regulation, the corresponding bandwidth of synchronizing sequence is 1.4MHz, according to the Nyquist law, sample rate sampling that can the 1.92MHz data of eating dishes without rice or wine, 5ms has 9600 sampled points.So-called PSS detects, and exactly through being that 128 slip is relevant with the data of eating dishes without rice or wine in three local PSS sequences and the 5ms as length, and then chooses normalization correlation the best part detected value group, the complete cell information of confession STEP2 detection.In order effectively to reduce LTE sub-district NID2 erroneous detection probability, can carry out α filtering to the PSS detected value group of adjacent two 5ms usually, detect performance to improve.
As shown in Figure 1 in the prior art to local PSS sequential filtering process.The corresponding PSS detected value group of all 9600 relevant positions (the relevant position value is from 0-9599) in each local PSS sequence 5ms, the corresponding relevant position of each PSS detected value.Each PSS detected value all will carry out α filtering, and 9600 detected value groups of the current 5ms filtering of buffer memory supply next 5ms filtering usefulness, simultaneously through ordering, therefrom selects the maximum a plurality of results of correlation and supplies to export STEP1 result and use.
Topmost shortcoming does in the prior art, and the filtering cost is too high.Each PSS detected value group need be stored 10 correlation, each mark frequency deviation of 33 (Fractional Frequency Offset, FFO) cross product real part and imaginary part, 10+33 * 2=76 position altogether.Each 5ms need store all 9600 PSS detected value groups, amounts to 76 * 9600=729600 position, and select 64 maximum related value index values, and 64 * 14=896 position is arranged, and the two amounts to the 729600+896=730496 position.Therefore, 3 local PSS sequences, adjacent two 5ms need store the data of 730496 * 2 * 3=4382976 position altogether.So high filtering carrying cost obviously is too much to waste storage resources.In addition, because each relevant position all needs filtering, storage RAM chip area is big, so power consumption is also than higher.
Summary of the invention
The embodiment of the invention provides main synchronizing sequence PSS detected value filtering method and device in a kind of Cell searching, to reduce the cost to local chief series PSS filtering, saves the cost to local chief series PSS filtering storage.
In first aspect, the embodiment of the invention provides main synchronizing sequence PSS detected value filtering method in a kind of Cell searching, and said filtering method comprises: obtain current PSS detected value;
First relevant position in the more said current PSS detected value whether with current before second relevant position in arbitrary PSS detected value in the maximum PSS detected value group identical;
If said first relevant position is identical with said second relevant position, then said current PSS detected value and said arbitrary PSS detected value are carried out filtering, obtain PSS detected value after the filtering; If said first relevant position is different with said second relevant position, do not carry out said filtering;
After first correlation that relatively first relevant position is corresponding or the filtering in the PSS detected value the corresponding third phase pass value of third phase closed position whether greater than whole minimum value of correlations in the current maximum PSS detected value group;
If said first correlation or third phase pass value greater than said minimum value, then starts the relevant position ordering, utilize said current PSS detected value or filtering after the PSS detected value replace the corresponding PSS detected value of said minimum value, obtain the PSS detected value group after the replacement.
In second aspect, the embodiment of the invention provides main synchronizing sequence PSS detected value filter in a kind of Cell searching, and said filter comprises: first acquiring unit is used to obtain current PSS detected value;
Filtering decision unit, first relevant position that is used for more said current PSS detected value whether with current before second relevant position in arbitrary PSS detected value in the maximum PSS detected value group identical;
Filter unit is used for then said current PSS detected value and said arbitrary PSS detected value being carried out filtering if said first relevant position is identical with said second relevant position, obtains PSS detected value after the filtering; If said first relevant position is different with said second relevant position, do not carry out said filtering;
Comparing unit is used for the corresponding third phase pass value of PSS detected value third phase closed position after first corresponding correlation of comparison first relevant position or the filtering whether greater than the minimum value of whole correlations in the current maximum PSS detected value group;
Performance element; If be used for said first correlation or third phase pass value greater than said minimum value; Then start relevant position ordering, utilize said current PSS detected value or filtering after the PSS detected value replace the corresponding PSS detected value of said minimum value, obtain the PSS detected value group after the replacement.
Through using embodiment of the invention the methods and apparatus disclosed, only need the part of local chief series PSS detected value group is carried out filtering, reduce the buffer memory cost, effectively reduce the power consumption of filtering operation amount and buffer memory parts, improve the detection performance of local chief series PSS.
Description of drawings
Fig. 1 is a prior art chief series PSS filters solutions block diagram;
Fig. 2 is the disclosed chief series PSS of an embodiment of the invention filtering method flow chart;
Fig. 3 is the disclosed chief series PSS of an embodiment of the invention filtering method block diagram;
Fig. 4 is the disclosed chief series PSS filtering storage resources distribution diagram of the embodiment of the invention;
Fig. 5 is disclosed another chief series of embodiment of the invention PSS filtering storage resources distribution diagram;
Fig. 6 is the disclosed chief series PSS of an embodiment of the invention filtering flow chart
Fig. 7 is the disclosed chief series PSS of embodiment of the invention filter figure.
Embodiment
For the technical scheme and the advantage that make the embodiment of the invention is clearer, the specific embodiment of the invention is done further to describe in detail below in conjunction with accompanying drawing.
Be that example specifies the disclosed filtering method of the embodiment of the invention below with Fig. 2, Fig. 2 is the disclosed chief series PSS of an embodiment of the invention filtering method flow chart.
Through to before current; The ordering of the correlation that promptly relevant position and relevant position are corresponding in the 1st 5ms (hereinafter to be referred as 5ms before current) this landlord synchronizing sequence PSS detected value; Therefrom select the maximum PSS detected value of the current 5ms before group that sorts out, and upgrade correlation index and relevant position index, the maximum PSS detected value of 5ms before current group is kept in first group of buffer memory; Supply currently, i.e. the 2nd 5ms (hereinafter to be referred as current 5ms) filtering is used; From first group of buffer memory, read relevant position in the current 5ms PSS detected value group before; Compare with relevant position in the current 5msPSS detected value; If in the current 5ms PSS detected value relevant position with current before in the 5ms maximum PSS detected value group certain relevant position identical; Then to the corresponding correlation of relevant position in the current 5msPSS detected value with current before in the 5ms maximum PSS detected value group the corresponding PSS detected value of relevant position carry out α filtering; The corresponding correlation of relevant position compares in the maximum PSS detected value of the current 5ms group that from current 5ms PSS detected value, sorts out simultaneously, the correlation that relevant position in the PSS detected value after current or the filtering is corresponding and the maximum PSS detected value of current 5ms group, if the correlation of relevant position correspondence is greater than the minimum value in all correlations in the current 5ms maximum PSS detected value group in current (or after filtering) PSS detected value; Then replace the corresponding PSS detected value of minimum correlation value in the maximum PSS detected value group of current 5ms correlation with PSS detected value after current or the filtering; Obtain the PSS detected value after the replacement, and the correlation that relevant position is corresponding in the PSS detected value after will replacing is kept in second group of buffer memory, supply current after; I.e. the 3rd 5ms filtering is used; Side not abandons PSS detected value after current PSS detected value or the filtering, realizes that filtering method needs following steps; As shown in Figure 2, specifically comprise:
Carrying out Filtering Processing when beginning; At first first group of buffer memory and second group of buffer memory are carried out zero clearing and handle, make two groups of buffer memorys be set to zero, before beginning to carry out Filtering Processing current during 5ms; Do not need filtering; Through ordering, therefrom select the maximum PSS detected value of the current 5ms before group that sorts out, and upgrade correlation index and relevant position index this landlord synchronizing sequence PSS Sequence Detection value; A plurality of maximum PSS detected value groups before current are kept in first group of buffer memory, supply current 5ms filtering to use.
Particularly; When carrying out the current 5ms of Filtering Processing, send the filtering solicited message to first group of buffer memory, promptly send the maximum benchmark PSS detected value group command that reads current 5ms before storage; And read current 5ms relevant position index RAM before, obtain the relevant position index value; Be the address with the relevant position index value then, read a plurality of maximum PSS detected value group of current 5ms before storage, and obtain current PSS detected value.
Relevant position in step 220, the more current 5msPSS detected value whether with current before arbitrary relevant position in the maximum PSS detected value of the 5ms group identical; If relevant position is identical, then execution in step 230; If relevant position is different, then execution in step 240;
Particularly; If relevant position is identical with relevant position from the maximum PSS detected value of current 5ms before group in the current 5ms PSS detected value group; Then need to the corresponding correlation of relevant position in the current 5ms PSS detected value with current before in the 5ms maximum PSS detected value group the corresponding correlation of relevant position carry out filtering; Be execution in step 230, obtain PSS detected value after the filtering; If relevant position is inequality with relevant position from the maximum PSS detected value of current 5ms before group in the current 5ms PSS detected value; Then not need to the corresponding correlation of relevant position in the current 5msPSS detected value with current before in the 5ms maximum PSS detected value group the corresponding correlation of relevant position carry out filtering, promptly execution in step 240.
The second corresponding correlation of second relevant position in corresponding first correlation of first relevant position in the current PSS detected value and the current maximum PSS detected value group is before carried out filtering; The second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in the current PSS detected value and imaginary part and the current maximum PSS detected value group are before carried out filtering.
In embodiments of the present invention, according to the LTE agreement, PSS and SSS launch in the cycle, and take the 1.4MHz bandwidth.LTE user can be that one-period is handled with 5ms when carrying out Cell searching; Carry out data sampling with the 1.92MHz sample rate, have 9600 data in the 5ms, corresponding 9600 sampling locations, i.e. relevant positions.
The value of relevant position is 0-9599, the data sampling position in the 5ms cycle, i.e. possible timing offset between sub-district and the user;
Correlation that is to say the normalization correlation, and it is corresponding one by one with relevant position, representes the signal strength signal intensity that this moment user receives, and is worth greatly more, and signal is strong more;
Mark frequency deviation cross product real part and imaginary part (being plural number altogether), it is also corresponding one by one with relevant position, comprises the frequency deviation information between this moment sub-district and the user.
Correlation in the current 5ms PSS detected value is sorted, obtain current maximum PSS detected value group.
Whether the correlation that relevant position is corresponding in more current (or after filtering) PSS detected value surpasses the minimum value in whole correlations in the current maximum PSS detected value group, if surpass minimum value, then execution in step 260; If be no more than minimum value, then execution in step 270;
Comparative result according to step 250; If the correlation that relevant position is corresponding in current (or after filtering) PSS detected value surpasses the minimum value in whole correlations in the current maximum PSS detected value group; Then start the ordering of the relevant position in the current maximum PSS detected value group, and execution in step 280.
According to the comparative result of step 250,, then directly current (or after filtering) PSS detected value is abandoned if the correlation that relevant position is corresponding in current (or after filtering) PSS detected value is not more than the minimum value in whole correlations in the current maximum PSS detected value group.
If the correlation that relevant position is corresponding in current (or after filtering) PSS detected value is greater than the minimum value in whole correlations in the current maximum PSS detected value group; Then replace the corresponding PSS detected value of minimum correlation value in the current maximum PSS detected value group, obtain the PSS detected value after the replacement with current (or after filtering) PSS detected value.And upgrade correlation and relevant position index, and the correlation that relevant position is corresponding in the PSS detected value after the replacement is stored in second buffer memory, supply current 5ms filtering afterwards to use.
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below.
Fig. 3 is the disclosed chief series PSS of an embodiment of the invention filtering method block diagram; As shown in Figure 3, LTE sub-district ID respectively corresponding 3 kinds of local PSS sequences, i.e. PSS0 sequence, PSS1 sequence and PSS2 sequence.The sampling interval is 5ms in the embodiment of the invention, and 9600 sampled points of sampling altogether are example and combine Fig. 4 with PSS0 sequence among Fig. 3, specifies the filtering to the PSS0 sequence.
Through ordering to this landlord synchronizing sequence PSS detected value before current; The maximum PSS detected value of current 5ms before group therefrom sorts out; And upgrade correlation index and relevant position index, and the maximum PSS detected value of 5ms before current group is kept in first group of buffer memory, supply current filtering to use; From first group of buffer memory, read the relevant position in the arbitrary PSS detected value in the maximum PSS detected value of the current 5ms before group; Compare with relevant position in the current 5msPSS detected value; If the relevant position in the arbitrary PSS detected value in the current 5msPSS detected value in relevant position and the current 5msPSS detected value group before is identical; Then the corresponding correlation of relevant position in the corresponding correlation of relevant position in the current 5msPSS detected value and the current 5ms PSS detected value group is before carried out α filtering; The maximum PSS detected value of current 5ms group simultaneously sorts out from current 5msPSS detected value; The minimum value of whole correlations compares in correlation that relevant position in current (or after filtering) PSS detected value is corresponding and the maximum PSS detected value of the current 5ms group; If the correlation that relevant position is corresponding in current (or after filtering) PSS detected value then uses current (or after filtering) PSS detected value to replace the corresponding PSS detected value of minimum correlation value in the maximum PSS detected value of the current 5ms group greater than whole minimum value of correlations in the maximum PSS detected value of the current 5ms group, obtain the PSS detected value after the replacement; And the PSS detected value after will replacing is kept in second group of buffer memory; Supply current 5ms filtering usefulness afterwards, side does not abandon current (or after filtering) PSS detected value.
As shown in Figure 3; PSS0 sequential filtering unit all comprises two groups of storage resources; Every group of storage resources comprises 1 spram64x90; Be used for storing maximum benchmark PSS0 detected value correlation, relevant position, FFO cross product real part and the FFO cross product imaginary part of a 5ms, 2 tpram64x6 are respectively applied for storage correlation index and relevant position index.Every at a distance from 5ms, system's switching of between two groups of storage resources, rattle, as shown in Figure 4, at the 1st 5ms, do not need filtering, second group of resource free time, read and write first group of resource line ordering of going forward side by side; At the 2nd 5ms, to first group of resource filtering, second group of resource of reading and writing line ordering of going forward side by side; At the 3rd 5ms, to second group of resource filtering, first group of resource of reading and writing line ordering of going forward side by side; Repeat, every later on separated 5ms switches once, finishes until the LTE Cell searching always.
Alternatively, two groups of also interchangeable memory contentss of storage resources, as shown in Figure 5, at the 1st 5ms, do not need filtering, first group of resource is idle, reads and writes second group of resource line ordering of going forward side by side; At the 2nd 5ms, to second group of resource filtering, first group of resource of reading and writing line ordering of going forward side by side; At the 3rd 5ms, to first group of resource filtering, second group of resource of reading and writing line ordering of going forward side by side; Repeat, every later on separated 5ms switches once, finishes until the LTE Cell searching always.
In embodiments of the present invention, two groups of storage resources taking are storage means as shown in Figure 4, concrete filtering such as Fig. 6 description, specifically may further comprise the steps:
Carrying out before Filtering Processing begins, at first first group of buffer memory and second group of buffer memory are being carried out zero clearing and handle, making two groups of buffer memorys be set to zero; Before beginning to carry out Filtering Processing current during 5ms; Do not need filtering,, select 64 current maximum PSS0 detected values before through ordering to PSS0 Sequence Detection value before current; Constitute current maximum PSS0 detected value group before; And upgrade correlation index and relevant position index, and maximum PSS0 detected value group before current is kept in first group of buffer memory, supply current 5ms filtering to use.
When carrying out the current 5ms of Filtering Processing, send the filtering solicited message to first group of buffer memory, promptly send and read the maximum PSS0 detected value group command of storing among the current 5ms before;
The maximum PSS0 detected value of current 5ms before group sorts out from 64 current 5ms PSS0 detected values before; Particularly, among the 5ms, a plurality of PSS0 detected values are to arrive in order before current; For 64 the PSS0 detected values that arrive; Then with the correlation in these 64 PSS0 detected values as the maximum PSS0 detected value of 5ms before current group; If in current 5ms before; The 65th PSS0 detected value arrives, and at this moment, the minimum value of correlation compares in correlation in the 65th the PSS0 detected value and 64 PSS0 detected value groups before;
If in the 65th PSS0 detected value correlation greater than before the minimum value of correlation in 64 PSS0 detected value groups; Then with the corresponding PSS detected value of minimum correlation value in 64 PSS0 detected value groups before the replacement of the 65th PSS0 detected value, and again to 64 current before the maximum PSS0 detected value groups of 5ms correlation sort;
If in the 65th PSS0 detected value correlation less than before the minimum value of correlation in 64 PSS0 detected value groups, then the 65th PSS0 detected value abandoned;
At this, all PSS0 detected values that arrive in the back all need pass through above-mentioned comparison procedure, realize only preserving the maximum PSS0 detected value of current 5ms before group with this.
Read current 5ms relevant position index RAM before, obtain the relevant position index value; Be the address with the relevant position index value then, read 64 maximum PSS0 detected value groups of current correlation before of storing among the current 5ms before.
Preceding text described for obtain current before the process of maximum PSS0 detected value group, obtain current before after the maximum PSS0 detected value group, when the 2nd 5ms arrives, obtain the PSS0 detected value of the 2nd 5ms, promptly current PSS0 detected value.
Particularly; If relevant position is identical with relevant position in arbitrary PSS detected value from current maximum PSS detected value group before in the current 5ms PSS detected value; Then need carry out filtering to the corresponding correlation of relevant position in the corresponding correlation of relevant position in the current 5ms PSS detected value and the current maximum PSS detected value group before, promptly execution in step 630; If the relevant position in the arbitrary PSS detected value in the current 5ms PSS detected value in relevant position and the current maximum PSS detected value group before is inequality; Then need not carry out filtering to the corresponding correlation of relevant position in the corresponding correlation of relevant position in the current 5ms PSS detected value and the current maximum PSS detected value group before, promptly execution in step 640.
Comparison court verdict according to step 620; When if the relevant position in the arbitrary PSS detected value in the current 5ms PSS detected value relevant position and the maximum PSS detected value of the 5ms group before current is identical, then need carry out filtering to the corresponding correlation of corresponding relevant position in the correlation of corresponding relevant position in the current 5ms PSS0 detected value and the current maximum of the 5ms before PSS0 detected value group;
Particularly, correlation that relevant position in the current 5ms PSS0 detected value is corresponding with current before in the 5ms maximum PSS0 detected value group the corresponding correlation of relevant position carry out filtering; The FFO cross product real part (curr_ffo_i) that relevant position in the current 5ms PSS0 detected value is corresponding with current before in the 5ms maximum PSS0 detected value group the corresponding FFO cross product real part of relevant position carry out filtering; The FFO cross product imaginary part (curr_ffo-q) that relevant position in the current 5ms PSS0 detected value is corresponding with current before in the 5ms maximum PSS0 detected value group the corresponding FFO cross product imaginary part of relevant position carry out filtering, obtain PSS0 detected value after the filtering.
In embodiments of the present invention, according to the LTE agreement, PSS and SSS launch in the cycle, and take the 1.4MHz bandwidth.LTE user can be that one-period is handled with 5ms when carrying out Cell searching; Carry out data sampling with the 1.92MHz sample rate, have 9600 data in the 5ms, corresponding 9600 sampling locations, i.e. relevant positions.
The value of relevant position is 0-9599, the data sampling position in the 5ms cycle, i.e. possible timing offset between sub-district and the user;
Correlation that is to say the normalization correlation, and it is corresponding one by one with relevant position, representes the signal strength signal intensity that this moment user receives, and is worth greatly more, and signal is strong more;
Mark frequency deviation cross product real part and imaginary part (being plural number altogether), it is also corresponding one by one with relevant position, comprises the frequency deviation information between this moment sub-district and the user.
Judgement according to step 620; Inequality as if relevant position in relevant position in the current 5ms PSS0 detected value and the current maximum PSS detected value group before; Then not need to the corresponding correlation of relevant position in the current 5ms PSS detected value with current before in the maximum PSS detected value group the corresponding correlation of relevant position carry out filtering, be about in the current 5ms PSS0 detected value correlation directly and in the current 5ms maximum PSS0 detected value group minimum value in all correlations sort;
If in the current 5ms PSS0 detected value in relevant position and the current maximum PSS detected value group before relevant position identical; Then need to the corresponding correlation of relevant position in the current 5ms PSS detected value with current before in the maximum PSS detected value group the corresponding correlation of relevant position carry out filtering, after the filtering soon in the 5ms PSS0 detected value in the PSS0 detected value group of correlation and current 5ms correlation maximum all correlations sort;
Before sorting, from a plurality of current PSS detected values, obtain the maximum PSS0 detected values of 64 current 5ms, constitute the maximum PSS0 detected value of current 5ms group, just according to the arrival of the PSS0 detected value current PSS0 Sequence Detection value that sorts.
Whether step 650, current (or after filtering) correlation be greater than whole minimum value of correlations in the current maximum PSS0 detected value group;
Whether the correlation that relevant position is corresponding in more current (or after filtering) PSS0 detected value surpasses the minimum value in whole correlations in the maximum PSS0 detected value of the current 5ms group; The minimum value in the PSS0 detected value group of the correlation that relevant position is corresponding in current if (or after filtering) PSS0 detected value greater than current 5ms correlation maximum in whole correlations, then execution in step 660; If the correlation that relevant position is corresponding in current (or after filtering) PSS0 detected value is not more than the minimum value in whole correlations in the maximum PSS0 detected value group of current 5ms correlation, then execution in step 670;
Comparative result according to step 650; If the correlation that relevant position is corresponding in current (or after filtering) PSS0 detected value then starts the ordering to the corresponding relevant position of minimum correlation value in the current maximum PSS0 detected value greater than the minimum value in the corresponding correlation of relevant position in the maximum PSS detected value of the current 5ms group;
Particularly; So-called relevant position ordering; Just from current maximum PSS0 detected value, seek the corresponding relevant position pos4min_corr of minimum value in the correlation, confirm the precedence relationship between the relevant position in the current maximum PSS0 detected value again, to upgrade the relevant position index;
Adopt the binary chop ranking method to carry out the relevant position ordering in the embodiment of the invention.If the corresponding relevant position pos4min_corr of minimum value of correlation equals relevant position pos [i] position that correlation is corresponding in the current maximum PSS0 detected value in the PSS0 detected value group of current correlation maximum; Be pos4min_corr==pos [i]; (wherein the i value is 0～63) is according to binary chop ranking method ordering rule; The relevant position index that correlation is corresponding in then current (or after filtering) PSS0 detected value is i, and corresponding part correlation location index value pidx [the i+1]-pidx [63] of correlation moves forward assignment successively to corr [i]-corr [62] in the maximum PSS0 detected value of the current correlation group.
Judgement according to step 650; If the correlation that relevant position is corresponding in current (or after filtering) PSS0 detected value is smaller or equal to the minimum value in whole correlations in the maximum PSS0 detected value of the current 5ms group; Be curr_corr＜=corr [63]; Judge that then magnitude relationship finishes, and abandons current (or after filtering) PSS0 detected value.
In one example, the embodiment of the invention adopts the binary chop ranking method with the magnitude relationship between all correlations in corresponding correlation of relevant position in the PSS detected value of confirming current (or after filtering) and the maximum PSS0 detected value of the current 5ms group;
If the minimum value in the PSS detected value group of the correlation that relevant position is corresponding in current (or after filtering) PSS0 detected value greater than current 5ms correlation maximum in whole correlations then uses current (or after filtering) PSS0 detected value to replace the corresponding PSS detected value of minimum correlation value in the maximum PSS detected value of the current 5ms group;
The correlation that relevant position is corresponding in current (or after filtering) PSS0 detected value is both smaller or equal to the i value in the correlation that relevant position is corresponding in the maximum PSS0 detected value of the current 5ms group; Again greater than the i+1 value in the correlation that relevant position is corresponding in the maximum PSS0 detected value of the current 5ms group; (wherein the i value is 0-63) is corr [i+1]＜curr_corr＜=corr [i]; According to the dichotomy ordering rule; The corresponding correlation index of relevant position is i+1 in the maximum PSS0 detected value of then current 5ms; Correlation index value corr [i+1]-corr [62] that relevant position is corresponding in the maximum PSS0 detected value of current 5ms moves assignment after successively and gives corr [i+2]-corr [63]; Promptly replace the corresponding PSS detected value of minimum correlation value in the maximum PSS0 detected value of the current 5ms group with the corresponding correlation of relevant position in current (or after filtering) PSS0 detected value; And the correlation of relevant position correspondence is stored in second group of buffer memory in the PSS0 detected value after will replacing, and supplies current 5ms filtering afterwards to use, and upgrades correlation and relevant position index in the PSS0 detected value after the replacement.
Need to prove that what in embodiments of the present invention the sort method of correlation, relevant position in the PSS0 detected value is all adopted is the binary chop ranking method, in practical application, also can adopt the sort method of other kinds, like the bubble sort method.
Like aforementioned described filtering, after carrying out Filtering Processing current, during 5ms, send the filtering solicited message to second group of buffer memory, promptly send and read the maximum PSS detected value group command of correlation of storing among the current 5ms; Read current 5ms relevant position index RAM, obtain the relevant position index value; Be the address with the relevant position index value then, read the maximum PSS0 detected value group of 64 correlations of storing among the current 5ms, and repeating step 610-step 680, this LTE Cell searching stopped until systems soft ware.
Need to prove; In embodiments of the present invention; To choosing 64 current maximums in the main synchronizing sequence PSS detected value group; In practical application, can be that 1ms, 2ms constant duration are chosen the different sampled point of quantity promptly also, from sampled point, choose a plurality of current maximums such as 32,128,256 through the form of configuration search window with window length.
Fig. 7 is the disclosed chief series PSS of embodiment of the invention filter figure; As shown in Figure 7, said filter comprises: first acquiring unit 710 is used to obtain current PSS detected value;
Comparing unit 740 is used for the corresponding third phase pass value of PSS detected value third phase closed position after first corresponding correlation of comparison first relevant position or the filtering whether greater than the minimum value of whole correlations in the current maximum PSS detected value group;
Said device also comprises: first memory cell 760 is used for obtaining current maximum PSS detected value group before from first group of buffer memory;
Filter unit specifically is used in the said device: second correlation corresponding with second relevant position to said first correlation carries out filtering; The second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in the said current PSS detected value and imaginary part and the said arbitrary PSS detected value are carried out filtering.
Comparing unit specifically is used in the said device: first correlation ordering through corresponding to said a plurality of current PSS detected value first relevant positions draws said current maximum PSS detected value group.
Comparing unit further specifically is used in the said device: adopt the binary chop ranking method to compare all magnitude relationship between the correlations of first correlation or third phase pass value and current maximum PSS detected value group.
Performance element specifically is used in the said device: adopt the binary chop ranking method with said current maximum PSS detected value group relevant position ordering.
The professional should further recognize; The unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein; Can realize with electronic hardware, computer software or the combination of the two; For the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in above-mentioned explanation.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each certain applications, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to carry out, perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
Above-described embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. main synchronizing sequence PSS detected value filtering method in the Cell searching is characterized in that said filtering method comprises:
Obtain current PSS detected value;
First relevant position in the more said current PSS detected value whether with current before second relevant position in arbitrary PSS detected value in the maximum PSS detected value group identical;
If said first relevant position is identical with said second relevant position, then said current PSS detected value and said arbitrary PSS detected value are carried out filtering, obtain PSS detected value after the filtering; If said first relevant position is different with said second relevant position, do not carry out said filtering;
After first correlation that relatively first relevant position is corresponding or the filtering in the PSS detected value the corresponding third phase pass value of third phase closed position whether greater than whole minimum value of correlations in the current maximum PSS detected value group;
If said first correlation or third phase pass value are greater than said minimum value; Then start relevant position ordering in the current maximum PSS detected value group; Utilize after said current PSS detected value or the filtering PSS detected value to replace the corresponding PSS detected value of said minimum value, obtain the PSS detected value group after the replacement.
2. filtering method according to claim 1 is characterized in that, said PSS detected value comprises:
Relevant position, correlation and mark frequency deviation cross product real part and imaginary part that relevant position is corresponding;
Said to said current PSS detected value with said current before maximum PSS detected value carry out filtering and comprise: second correlation corresponding to said first correlation and second relevant position carries out filtering; The second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in the said current PSS detected value and imaginary part and the said arbitrary PSS detected value are carried out filtering.
3. filtering method according to claim 1 is characterized in that, said obtaining before the current PSS detected value, and said method also comprises:
From first group of buffer memory, obtain current maximum PSS detected value group before;
Said current maximum PSS detected value group is kept in second group of buffer memory.
4. filtering method according to claim 1 is characterized in that, said current maximum PSS detected value group comprises: first correlation ordering through corresponding to said a plurality of current PSS detected value first relevant positions draws said current maximum PSS detected value group.
5. filtering method according to claim 1; It is characterized in that, after first correlation that said comparison first relevant position is corresponding or the filtering in the PSS detected value the corresponding third phase pass value of third phase closed position whether comprise greater than the minimum value of whole correlations in the current maximum PSS detected value group:
Adopt the binary chop ranking method to compare the magnitude relationship between whole correlations in first correlation or third phase pass value and the current maximum PSS detected value group.
6. filtering method according to claim 1 is characterized in that, the relevant position ordering comprises in the current maximum PSS detected value group of said startup:
Adopt the binary chop ranking method with relevant position ordering in the said current maximum PSS detected value group.
7. main synchronizing sequence PSS detected value filter in the Cell searching is characterized in that said filter comprises:
First acquiring unit is used to obtain current PSS detected value;
Filtering decision unit, first relevant position that is used for more said current PSS detected value whether with current before second relevant position in arbitrary PSS detected value in the maximum PSS detected value group identical;
Filter unit is used for then said current PSS detected value and said arbitrary PSS detected value being carried out filtering if said first relevant position is identical with said second relevant position, obtains PSS detected value after the filtering; If said first relevant position is different with said second relevant position, do not carry out said filtering;
Comparing unit is used for the corresponding third phase pass value of PSS detected value third phase closed position after first corresponding correlation of comparison first relevant position or the filtering whether greater than the minimum value of whole correlations in the current maximum PSS detected value group;
Performance element; If be used for said first correlation or third phase pass value greater than said minimum value; Then start relevant position ordering, utilize said current PSS detected value or filtering after the PSS detected value replace the corresponding PSS detected value of said minimum value, obtain the PSS detected value group after the replacement.
8. filter according to claim 7 is characterized in that, said filter unit specifically is used for:
Said PSS detected value comprises: relevant position, correlation and mark frequency deviation cross product real part and imaginary part that relevant position is corresponding;
Second correlation corresponding with second relevant position to said first correlation carries out filtering; The second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in the said current PSS detected value and imaginary part and the said arbitrary PSS detected value are carried out filtering.
9. filter according to claim 7 is characterized in that, said device also comprises: first memory cell is used for obtaining current maximum PSS detected value group before from first group of buffer memory;
Second memory cell is used for just said current maximum PSS detected value group and is kept at second group of buffer memory.
10. filter according to claim 7 is characterized in that, said comparing unit specifically is used for: first correlation ordering through corresponding to said a plurality of current PSS detected value first relevant positions draws said current maximum PSS detected value group.
11. filter according to claim 7 is characterized in that, said comparing unit further specifically is used for:
Adopt the binary chop ranking method to compare the magnitude relationship between whole correlations in first correlation or third phase pass value and the current maximum PSS detected value group.
12. filter according to claim 7 is characterized in that, said performance element specifically is used for:
Adopt the binary chop ranking method with relevant position ordering in the said current maximum PSS detected value group.
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