CN102594395B - 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 technology, it improves and has strengthened the aerial access technology of 3G, adopt orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, and multi-input multi-output antenna system (Multiple-Input Multiple-Out-put OFDM), MIMO) as the sole criterion of its wireless network evolution.
First user must experience cell search process in the time of access Yi Ge LTE community, then carries out synchronizing process, to ensure that user obtains the parameter such as timing and frequency deviation estimation of operations such as can carrying out upward signal transmitting and descending reception data demodulates.The definition of LTE system protocol has 504 unique physical-layer cells, and each LTE community respectively has a cell identity mark to indicate number (Identity ,-ID).Community ID=3*NID1+NID2, wherein NID2=0,1,2, respectively corresponding 3 kinds of this landlord synchronizing sequence (Primary Synchronization Sequence, PSS), NID1 value 0～167, respectively corresponding 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 the ID of community, each LTE cell information also comprises the information such as carrier frequency frequency, frame synchronization, the instruction of front and back field, CP (Cyclic Prefix) type, mark frequency deviation.
LTE has Frequency Division Duplexing (FDD) (Frequency Division Duplexing, and time division duplex (Time Division Duplexing FDD), TDD) two kinds of frame formats, PSS sequence and SSS sequence all repeat taking half radio frames (5ms) as the cycle.Cell searching is exactly the correlation that user utilizes PSS sequence and SSS sequence, taking 5ms as cycle detection LTE cell information, obtain when descending, frequently synchronous process, be divided into PSS and detect (STEP1) and SSS detection (STEP2) two steps.LTE system protocol regulation, the corresponding bandwidth of synchronizing sequence is 1.4MHz, according to 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, relevant by the slip that is 128 to the data of eating dishes without rice or wine in 5ms as length by three local PSS sequences exactly, and then chooses normalized correlation the best part detected value group, detects complete cell information for STEP2.In order effectively to reduce LTE community NID2 error detection probability, conventionally can carry out α filtering to the PSS detected value group of adjacent two 5ms, to improve detection performance.
In prior art to local PSS sequential filtering process as shown in Figure 1.PSS detected value group corresponding to all 9600 relevant positions (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 are for next 5ms filtering, simultaneously by sequence, therefrom select multiple results of correlation maximum for output STEP1 result.
In prior art, topmost shortcoming is, filtering cost is too high.Each PSS detected value group need to be stored the correlation of 10, the mark frequency deviation of each 33 (Fractional Frequency Offset, FFO) cross product real part and imaginary part, amounts to 10+33 × 2=76 position.Each 5ms need to store all 9600 PSS detected value groups, amounts to 76 × 9600=729600 position, and select 64 maximum related value index values, has 64 × 14=896 position, and the two amounts to 729600+896=730496 position.Therefore, 3 local PSS sequences, adjacent two 5ms need to store the data of 730496 × 2 × 3=4382976 position altogether.So high filtering carrying cost, is obviously too much to waste storage resources.In addition, because each relevant position needs filtering, storage RAM chip area is large, and therefore power consumption is also higher.
Summary of the invention
The embodiment of the present 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 present invention provides main synchronizing sequence PSS detected value filtering method in a kind of Cell searching, and described filtering method comprises: obtain current PSS detected value;
The first relevant position in more described current PSS detected value whether with current before the second relevant position in arbitrary PSS detected value in maximum PSS detected value group identical;
If described the first relevant position is identical with described the second relevant position, described current PSS detected value and described arbitrary PSS detected value are carried out to filtering, obtain PSS detected value after filtering; If described the first relevant position is different from described the second relevant position, do not carry out described filtering;
After the first correlation that relatively the first relevant position is corresponding or filtering, in PSS detected value, third phase closes the minimum value whether third phase pass value corresponding to position is greater than whole correlations in current maximum PSS detected value group;
If described the first correlation or third phase pass value are greater than described minimum value, start relevant position sequence, utilize described current PSS detected value or filtering after PSS detected value replace PSS detected value corresponding to described minimum value, obtain the PSS detected value group after replacement.
In second aspect, the embodiment of the present invention provides main synchronizing sequence PSS detected value filter in a kind of Cell searching, and described filter comprises: the first acquiring unit, for obtaining current PSS detected value;
Filtering decision unit, for the first relevant position of more described current PSS detected value whether with current before the second relevant position in arbitrary PSS detected value in maximum PSS detected value group identical;
Filter unit, if identical with described the second relevant position for described the first relevant position, carries out filtering to described current PSS detected value and described arbitrary PSS detected value, obtains PSS detected value after filtering; If described the first relevant position is different from described the second relevant position, do not carry out described filtering;
Comparing unit, closes for PSS detected value third phase after the first correlation corresponding to comparison the first relevant position or filtering the minimum value whether third phase pass value corresponding to position is greater than whole correlations in current maximum PSS detected value group;
Performance element, if be greater than described minimum value for described the first correlation or third phase pass value, start relevant position sequence, utilize described current PSS detected value or filtering after PSS detected value replace PSS detected value corresponding to described minimum value, obtain the PSS detected value group after replacement.
By application embodiment of the present invention the methods and apparatus disclosed, only need carry out filtering to the part of local chief series PSS detected value group, reduce 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.
Brief description of the drawings
Fig. 1 is prior art chief series PSS filters solutions block diagram;
Fig. 2 is the disclosed chief series PSS of embodiment of the present invention filtering method flow chart;
Fig. 3 is the disclosed chief series PSS of embodiment of the present invention filtering method block diagram;
Fig. 4 is the disclosed chief series PSS filtering storage resources distribution diagram of the embodiment of the present invention;
Fig. 5 is disclosed another chief series of embodiment of the present invention PSS filtering storage resources distribution diagram;
Fig. 6 is the disclosed chief series PSS of embodiment of the present invention filtering flow chart
Fig. 7 is the disclosed chief series PSS of embodiment of the present invention filter figure.
Embodiment
For making technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
Describe the disclosed filtering method of the embodiment of the present invention below in detail as an example of Fig. 2 example, Fig. 2 is the disclosed chief series PSS of embodiment of the present invention filtering method flow chart.
By to before current, the sequence of the correlation that in the 1st 5ms (hereinafter to be referred as 5ms before current) this landlord synchronizing sequence PSS detected value, relevant position and relevant position are corresponding, 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, for current, 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 current 5ms PSS detected value group before, compare with relevant position in current 5msPSS detected value, if relevant position is identical with certain relevant position in the maximum PSS detected value of current 5ms before group in current 5ms PSS detected value, the correlation PSS detected value corresponding with relevant position in the maximum PSS detected value of current 5ms before group that in current 5msPSS detected value, relevant position is corresponding carried out to α filtering, the maximum PSS detected value of current 5ms group sorts out simultaneously from current 5ms PSS detected value, the correlation that the correlation that in PSS detected value after current or filtering, relevant position is corresponding is corresponding with relevant position in the maximum PSS detected value of current 5ms group compares, if correlation corresponding to relevant position is greater than the minimum value in all correlations in the maximum PSS detected value of current 5ms group in current (or after filtering) PSS detected value, replace PSS detected value corresponding to minimum correlation value in the PSS detected value group of current 5ms correlation maximum with PSS detected value after current or filtering, obtain the PSS detected value after replacement, and correlation corresponding to relevant position in the PSS detected value after replacing is kept in second group of buffer memory, for after current, i.e. the 3rd 5ms filtering is used, no side, abandon PSS detected value after current PSS detected value or filtering, realize filtering method and need following steps, as shown in Figure 2, specifically comprise:
Step 210, obtain current PSS detected value;
In the time carrying out filtering processing beginning, first first group of buffer memory and second group of buffer memory are carried out to zero clearing processing, making two groups of buffer settings is zero, before starting to carry out filtering processing current when 5ms, do not need filtering, by the sequence to this landlord synchronizing sequence PSS Sequence Detection 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, multiple maximum PSS detected value groups before current are kept in first group of buffer memory, for current 5ms filtering.
Particularly, in the time carrying out filtering and process current 5ms, send filtering solicited message to first group of buffer memory, send read current before the maximum benchmark PSS detected value group command of 5ms storage, and read current 5ms relevant position index RAM before, obtain relevant position index value; Then taking relevant position index value as address, read the multiple maximum PSS detected value group of current 5ms storage before, and obtain current PSS detected value.
Whether the relevant position in step 220, more current 5msPSS detected value is identical with the arbitrary relevant position in the maximum PSS detected value of current 5ms before group; If relevant position is identical, perform step 230; If relevant position difference, performs step 240;
Particularly, if relevant position is identical with relevant position the maximum PSS detected value of 5ms group before current in current 5ms PSS detected value group, need the correlation correlation corresponding with relevant position in the maximum PSS detected value of current 5ms before group that in current 5ms PSS detected value, relevant position is corresponding to carry out filtering, perform step 230, obtain PSS detected value after filtering; If relevant position is not identical with relevant position the maximum PSS detected value of 5ms group before current in current 5ms PSS detected value, do not need the correlation correlation corresponding with relevant position in the maximum PSS detected value of current 5ms before group that in current 5msPSS detected value, relevant position is corresponding to carry out filtering, perform step 240.
Step 230, carry out filtering;
The first correlation second correlation corresponding with the second relevant position in current maximum PSS detected value group before that in current PSS detected value, the first relevant position is corresponding carried out to filtering; The second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in current PSS detected value and imaginary part and current maximum PSS detected value group are before carried out to filtering.
In embodiments of the present invention, according to LTE agreement, PSS and SSS launch taking 5ms as the cycle, and take 1.4MHz bandwidth.LTE user, in the time carrying out Cell searching, can process taking 5ms as one-period; Carry out data sampling with 1.92MHz sample rate, in 5ms, have 9600 data, 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 community and user;
Correlation that is to say normalized correlation, and it is corresponding one by one with relevant position, represents the signal strength signal intensity that this moment user receives, and is worth greatlyr, and signal is stronger;
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 community and user.
Step 240, the magnitude relationship between all correlations in correlation that in current (or after filtering) PSS detected value, relevant position is corresponding and current maximum PSS detected value group is sorted;
Correlation in current 5ms PSS detected value is sorted, obtain current maximum PSS detected value group.
Step 250, more whether exceed minimum value;
In more current (or after filtering) PSS detected value, whether correlation corresponding to relevant position exceedes the minimum value in whole correlations in current maximum PSS detected value group, if exceed minimum value, performs step 260; If the minimum value of being no more than, performs step 270;
Step 260, startup are to the relevant position sequence in current maximum PSS detected value;
According to the comparative result of step 250, if correlation corresponding to relevant position exceedes the minimum value in whole correlations in current maximum PSS detected value group in current (or after filtering) PSS detected value, start the relevant position sequence in current maximum PSS detected value group, and perform step 280.
Step 270, abandon current (or after filtering) PSS detected value;
According to the comparative result of step 250, if correlation corresponding to relevant position is not more than the minimum value in whole correlations in current maximum PSS detected value group in current (or after filtering) PSS detected value, directly current (or after filtering) PSS detected value is abandoned.
Step 280, replacement minimum value, obtain the PSS detected value after replacement, and upgrade correlation index;
If correlation corresponding to relevant position is greater than the minimum value in whole correlations in current maximum PSS detected value group in current (or after filtering) PSS detected value, replace PSS detected value corresponding to minimum correlation value in current maximum PSS detected value group with current (or after filtering) PSS detected value, obtain the PSS detected value after replacement.And upgrade correlation and relevant position index, and correlation corresponding to relevant position in the PSS detected value after replacing is stored in the second buffer memory, for the 5ms filtering after current.
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described.
Fig. 3 is the disclosed chief series PSS of embodiment of the present invention filtering method block diagram; As shown in Figure 3, respectively corresponding 3 kinds of local PSS sequences, i.e. PSS0 sequence, PSS1 sequence and PSS2 sequence of LTE community ID.In the embodiment of the present invention, the sampling interval is 5ms, and 9600 sampled points of sampling altogether as example and in conjunction with Fig. 4, describe the filtering to PSS0 sequence taking PSS0 sequence in Fig. 3 in detail.
By the sequence 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, the maximum PSS detected value of 5ms before current group is kept in first group of buffer memory, for current filtering; from first group of buffer memory, read the relevant position in the arbitrary PSS detected value in the maximum PSS detected value of upper current 5ms before group, compare with relevant position in current 5msPSS detected value, if in current 5msPSS detected value relevant position with current before relevant position in arbitrary PSS detected value in 5msPSS detected value group identical, the correlation correlation corresponding with relevant position in current 5ms PSS detected value group before that in current 5msPSS detected value, relevant position is corresponding carried out to α filtering, the maximum PSS detected value of current 5ms group sorts out simultaneously from current 5msPSS detected value, the minimum value of whole correlations in the correlation that in current (or after filtering) PSS detected value, relevant position is corresponding and the maximum PSS detected value of current 5ms group is compared, if correlation corresponding to relevant position is greater than the minimum value of whole correlations in the maximum PSS detected value of current 5ms group in current (or after filtering) PSS detected value, use current (or after filtering) PSS detected value to replace PSS detected value corresponding to minimum correlation value in the maximum PSS detected value of current 5ms group, obtain the PSS detected value after replacement, and the PSS detected value after replacing is kept in second group of buffer memory, for 5ms filtering after current, no side, 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, for maximum benchmark PSS0 detected value correlation, relevant position, FFO cross product real part and the FFO cross product imaginary part of storing a 5ms, 2 tpram64x6, are respectively used to store correlation index and relevant position index.Every 5ms, system is pingpang handoff between two groups of storage resources, as shown in Figure 4, at the 1st 5ms, does not need filtering, second group of resource free time, reads and writes 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 always, switch once every 5ms, until LTE Cell searching finishes later.
Alternatively, yet interchangeable storage content of two groups of storage resources, as shown in Figure 5, at the 1st 5ms, does not need filtering, first group of resource free time, 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 always, switch once every 5ms, until LTE Cell searching finishes later.
In embodiments of the present invention, two groups of storage resources taking are storage means as shown in Figure 4, and concrete filtering, as Fig. 6 describes, specifically comprises the following steps:
Step 610, obtain current PSS detected value;
Before carrying out filtering processing and starting, first first group of buffer memory and second group of buffer memory are carried out to zero clearing processing, making two groups of buffer settings is zero, before starting to carry out filtering processing current when 5ms, do not need filtering, by the sequence to PSS0 Sequence Detection value before current, select 64 current maximum PSS0 detected values before, form current maximum PSS0 detected value group before, and upgrade correlation index and relevant position index, maximum PSS0 detected value group before current is kept in first group of buffer memory, for current 5ms filtering.
In the time carrying out the current 5ms of filtering processing, send filtering solicited message to first group of buffer memory, send and read the maximum PSS0 detected value group command of storing in current 5ms before;
The maximum PSS0 detected value of current 5ms before group sorts out 5ms PSS0 detected value before current from 64; Particularly, before current, in 5ms, multiple PSS0 detected values are to arrive in order; For 64 the PSS0 detected values that arrive, using the maximum PSS0 detected value of the 5ms group before current of the correlation in these 64 PSS0 detected values, if before current in 5ms, the 65th PSS0 detected value arrives, at this moment, in the 65th PSS0 detected value, in correlation and 64 PSS0 detected value groups before, the minimum value of correlation compares;
If in the 65th PSS0 detected value correlation be greater than before the minimum value of correlation in 64 PSS0 detected value groups, the 65th PSS0 detected value replaced it to PSS detected value corresponding to minimum correlation value in front 64 PSS0 detected value groups, and again 64 current PSS0 detected value groups of 5ms correlation maximum are before sorted;
If in the 65th PSS0 detected value correlation be less than before the minimum value of correlation in 64 PSS0 detected value groups, the 65th PSS0 detected value abandoned;
At this, all PSS0 detected values of rear arrival all need through above-mentioned comparison procedure, realize and only preserve the maximum PSS0 detected value of current 5ms before group with this.
Read current 5ms relevant position index RAM before, obtain relevant position index value; Then taking relevant position index value as address, read 64 current PSS0 detected value groups of correlation maximum before of storing in current 5ms before.
As described above for obtaining the current process of maximum PSS0 detected value group before, obtain after current maximum PSS0 detected value group before, in the time of the 2nd 5ms arrival, obtain the PSS0 detected value of the 2nd 5ms, i.e. current PSS0 detected value.
Step 620, filtering judgement, in more current 5msPSS0 detected value relevant position whether with current before relevant position in arbitrary PSS detected value in maximum PSS0 detected value group identical, if relevant position is identical, perform step 630; If relevant position difference, performs step 640;
Particularly, if relevant position is identical with the relevant position in arbitrary PSS detected value from maximum PSS detected value group before current in current 5ms PSS detected value, need the correlation correlation corresponding with relevant position in current maximum PSS detected value group before that in current 5ms PSS detected value, relevant position is corresponding to carry out filtering, perform step 630; If in current 5ms PSS detected value relevant position with current before relevant position in arbitrary PSS detected value in maximum PSS detected value group not identical, do not need the correlation correlation corresponding with relevant position in current maximum PSS detected value group before that in current 5ms PSS detected value, relevant position is corresponding to carry out filtering, perform step 640.
Step 630, carry out filtering;
According to the comparison court verdict of step 620, if when in current 5ms PSS detected value, relevant position is identical with relevant position in arbitrary PSS detected value from the maximum PSS detected value of 5ms before current group, need to the correlation of corresponding relevant position in current 5ms PSS0 detected value with current before corresponding relevant position is corresponding in 5ms maximum PSS0 detected value group correlation carry out filtering;
Particularly, the correlation that in current 5ms PSS0 detected value, relevant position the is corresponding correlation corresponding with relevant position in the maximum PSS0 detected value of current 5ms before group carried out to filtering; The FFO cross product real part that the FFO cross product real part (curr_ffo_i) that in current 5ms PSS0 detected value, relevant position is corresponding is corresponding with relevant position in the maximum PSS0 detected value of current 5ms before group carries out filtering; By the FFO cross product imaginary part (curr_ffo-q) that in current 5ms PSS0 detected value, relevant position is corresponding with current before relevant position is corresponding in the maximum PSS0 detected value of 5ms group FFO cross product imaginary part carry out filtering, obtain PSS0 detected value after filtering.
In embodiments of the present invention, according to LTE agreement, PSS and SSS launch taking 5ms as the cycle, and take 1.4MHz bandwidth.LTE user, in the time carrying out Cell searching, can process taking 5ms as one-period; Carry out data sampling with 1.92MHz sample rate, in 5ms, have 9600 data, 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 community and user;
Correlation that is to say normalized correlation, and it is corresponding one by one with relevant position, represents the signal strength signal intensity that this moment user receives, and is worth greatlyr, and signal is stronger;
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 community and user.
Step 640, all correlations in the maximum PSS0 detected value of correlation in current (or after filtering) PSS0 detected value and current 5ms group are sorted;
According to the judgement of step 620, if relevant position is not identical with relevant position in current maximum PSS detected value group before in current 5ms PSS0 detected value, do not need the correlation correlation corresponding with relevant position in current maximum PSS detected value group before that in current 5ms PSS detected value, relevant position is corresponding to carry out filtering, sort by the minimum value in all correlations in the maximum PSS0 detected value of the direct and current 5ms of correlation in current 5ms PSS0 detected value group;
If relevant position is identical with relevant position in current maximum PSS detected value group before in current 5ms PSS0 detected value, need the correlation correlation corresponding with relevant position in current maximum PSS detected value group before that in current 5ms PSS detected value, relevant position is corresponding to carry out filtering, sort by all correlations in the PSS0 detected value group of correlation in 5ms PSS0 detected value after filtering and current 5ms correlation maximum;
Before sorting, from multiple current PSS detected values, obtain the maximum PSS0 detected values of 64 current 5ms, form the maximum PSS0 detected value of current 5ms group, namely according to the arrival of the PSS0 detected value current PSS0 Sequence Detection value that sorts.
Whether step 650, current (or after filtering) correlation are greater than the minimum value of whole correlations in current maximum PSS0 detected value group;
In more current (or after filtering) PSS0 detected value, whether correlation corresponding to relevant position exceedes the minimum value in whole correlations in the maximum PSS0 detected value of current 5ms group, if correlation corresponding to relevant position is greater than in the PSS0 detected value group of current 5ms correlation maximum the minimum value in whole correlations in current (or after filtering) PSS0 detected value, perform step 660; If correlation corresponding to relevant position is not more than in the PSS0 detected value group of current 5ms correlation maximum the minimum value in whole correlations in current (or after filtering) PSS0 detected value, perform step 670;
Step 660, relevant position sequence;
According to the comparative result of step 650, if correlation corresponding to relevant position is greater than the minimum value in the corresponding correlation of relevant position in the maximum PSS detected value of current 5ms group in current (or after filtering) PSS0 detected value, start the sequence to the corresponding relevant position of minimum correlation value in current maximum PSS0 detected value;
Particularly, so-called relevant position sequence, namely from current maximum PSS0 detected value, find the corresponding relevant position pos4min_corr of minimum value in correlation, redefine the precedence relationship between relevant position in current maximum PSS0 detected value, to upgrade relevant position index;
In the embodiment of the present invention, adopt binary chop ranking method to carry out relevant position sequence.If the relevant position pos4min_corr corresponding to minimum value of correlation equals relevant position pos[i corresponding to correlation in current maximum PSS0 detected value in the PSS0 detected value group of current correlation maximum] position, be pos4min_corr==pos[i], (wherein i value is 0～63) is according to binary chop ranking method ordering rule, in current (or after filtering) PSS0 detected value, relevant position index corresponding to correlation is i, part relevant position index value pidx[i+1 corresponding to correlation in the maximum PSS0 detected value of current correlation group]-pidx[63] assignment that moves forward is successively to corr[i]-corr[62].
Step 670, abandon correlation;
According to the judgement of step 650, if correlation corresponding to relevant position is less than or equal to the minimum value in whole correlations in the maximum PSS0 detected value of current 5ms group in current (or after filtering) PSS0 detected value, be curr_corr <=corr[63], judge that magnitude relationship finishes, current (or after filtering) PSS0 detected value is abandoned.
Step 680, replacement minimum value, and upgrade correlation and relevant position index;
In one example, the embodiment of the present invention adopts in the PSS detected value of binary chop ranking method current to determine (or after filtering) magnitude relationship between all correlations in the corresponding correlation of relevant position and current 5ms maximum PSS0 detected value group;
If correlation corresponding to relevant position is greater than in the PSS detected value group of current 5ms correlation maximum the minimum value in whole correlations in current (or after filtering) PSS0 detected value, use current (or after filtering) PSS0 detected value to replace PSS detected value corresponding to minimum correlation value in the maximum PSS detected value of current 5ms group;
In current (or after filtering) PSS0 detected value, correlation corresponding to relevant position had both been less than or equal to the i value in the correlation that in the maximum PSS0 detected value of current 5ms group, relevant position is corresponding, be greater than again the i+1 value in the correlation that in the maximum PSS0 detected value of current 5ms group, relevant position is corresponding, (wherein i value is 0-63) is corr[i+1] < curr_corr <=corr[i], according to dichotomy ordering rule, in the maximum PSS0 detected value of current 5ms, correlation index corresponding to relevant position is i+1, correlation index value corr[i+1 corresponding to relevant position in the maximum PSS0 detected value of current 5ms]-corr[62] move afterwards successively assignment to corr[i+2]-corr[63], replace PSS detected value corresponding to minimum correlation value in the maximum PSS0 detected value of current 5ms group with correlation corresponding to relevant position in current (or after filtering) PSS0 detected value, and correlation corresponding to relevant position in the PSS0 detected value after replacing is stored in second group of buffer memory, for 5ms filtering after current, and upgrade replace after PSS0 detected value in correlation and relevant position index.
It should be noted that, what in embodiments of the present invention the sort method of correlation, relevant position in PSS0 detected value is all adopted is binary chop ranking method, also can adopt in actual applications the sort method of other kinds, as bubble sort method.
As aforementioned described filtering, after carrying out filtering processing current, when 5ms, send filtering solicited message to second group of buffer memory, send the PSS detected value group command that reads the correlation maximum of storing in current 5ms; Read current 5ms relevant position index RAM, obtain relevant position index value; Then taking relevant position index value as address, read the PSS0 detected value group of 64 correlation maximums of storing in current 5ms, and repeating step 610-step 680, until systems soft ware stops this LTE Cell searching.
It should be noted that, in embodiments of the present invention, to choosing 64 current maximums in main synchronizing sequence PSS detected value group, also can search for by configuration in actual applications the form of window, taking window length as 1ms, 2ms constant duration chooses the sampled point that quantity is different, chooses multiple current maximums such as 32,128,256 from sampled point.
Fig. 7 is the disclosed chief series PSS of embodiment of the present invention filter figure; As shown in Figure 7, described filter comprises: the first acquiring unit 710, for obtaining current PSS detected value;
Filtering decision unit 720, for the first relevant position of more described current PSS detected value whether with current before the second relevant position in arbitrary PSS detected value in maximum PSS detected value group identical;
Filter unit 730, if identical with described the second relevant position for described the first relevant position, carries out filtering to described current PSS detected value and described arbitrary PSS detected value, obtains PSS detected value after filtering; If described the first relevant position is different from described the second relevant position, do not carry out described filtering;
Comparing unit 740, closes for PSS detected value third phase after the first correlation corresponding to comparison the first relevant position or filtering the minimum value whether third phase pass value corresponding to position is greater than whole correlations in current maximum PSS detected value group;
Performance element 750, if be greater than described minimum value for described the first correlation or third phase pass value, start relevant position sequence, utilize described current PSS detected value or filtering after PSS detected value replace PSS detected value corresponding to described minimum value, obtain the PSS detected value group after replacement.
Described device also comprises: the first memory cell 760, for obtain current maximum PSS detected value group before from first group of buffer memory;
The second memory cell 770, is kept at second group of buffer memory for just described current maximum PSS detected value group.
In described device filter unit specifically for: second correlation corresponding with the second relevant position to described the 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 described current PSS detected value and imaginary part and described arbitrary PSS detected value are carried out to filtering.
In described device comparing unit specifically for: by the first correlation sequence corresponding to described multiple current PSS detected value the first relevant positions, draw described current maximum PSS detected value group.
In described device comparing unit further specifically for: adopt the relatively magnitude relationship between whole correlations in the first correlation or third phase pass value and current maximum PSS detected value group of binary chop ranking method.
In described device performance element specifically for: adopt binary chop ranking method in described current maximum PSS detected value group, to sort by relevant position.
Professional should further recognize, 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 is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function with distinct methods to each specifically should being used for, 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, or the combination of the two is implemented.Software module can be placed in 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 technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (16)
1. a main synchronizing sequence PSS detected value filtering method in Cell searching, is characterized in that, described filtering method comprises:
Obtain current PSS detected value;
The first relevant position in more described current PSS detected value whether with current before the second relevant position in arbitrary PSS detected value in maximum PSS detected value group identical;
If described the first relevant position is identical with described the second relevant position, the first correlation second correlation corresponding with the second relevant position in described arbitrary PSS detected value corresponding to the first relevant position in described current PSS detected value carried out to filtering, obtain PSS detected value after filtering; If described the first relevant position is different from described the second relevant position, do not carry out described filtering;
Different from described the second relevant position when described the first relevant position, while not carrying out described filtering, relatively whether the first correlation corresponding to the first relevant position is greater than the minimum value of whole correlations in current maximum PSS detected value group;
If described the first correlation is greater than described minimum value, start relevant position sequence in current maximum PSS detected value group, utilize described current PSS detected value to replace PSS detected value corresponding to described minimum value, obtain the PSS detected value group after replacement;
Wherein, described current maximum PSS detected value group is specifically by acquisition that correlation in described current PSS detected value is sorted.
2. filtering method according to claim 1, it is characterized in that, when described the first relevant position identical with described the second relevant position, first correlation with in the described arbitrary PSS detected value second relevant position corresponding correlation corresponding to the first relevant position in described current PSS detected value carries out filtering, obtain after filtering after PSS detected value, described method also comprises:
Relatively after filtering, in PSS detected value, third phase closes the minimum value whether third phase pass value corresponding to position is greater than whole correlations in current maximum PSS detected value group;
If described third phase pass value is greater than described minimum value, start in current maximum PSS detected value group relevant position sequence, utilize described filtering after PSS detected value replace PSS detected value corresponding to described minimum value, obtain the PSS detected value group after replacement.
3. filtering method according to claim 1, is characterized in that, described PSS detected value comprises:
Relevant position, the correlation that relevant position is corresponding and mark frequency deviation cross product real part and imaginary part;
Describedly the first correlation second correlation corresponding with the second relevant position in described arbitrary PSS detected value corresponding to the first relevant position in described current PSS detected value carried out to filtering comprise: the second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in described current PSS detected value and imaginary part and described arbitrary PSS detected value are carried out to filtering.
4. filtering method according to claim 1, is characterized in that, described in obtain current PSS detected value before, described method also comprises:
From first group of buffer memory, obtain current maximum PSS detected value group before;
Described current maximum PSS detected value group is kept in second group of buffer memory.
5. filtering method according to claim 1, is characterized in that, described current maximum PSS detected value group comprises: by the first correlation sequence corresponding to multiple current PSS detected value the first relevant positions, draw described current maximum PSS detected value group.
6. filtering method according to claim 1, is characterized in that, the minimum value whether the first correlation corresponding to described comparison the first relevant position is greater than whole correlations in current maximum PSS detected value group comprises:
Adopt binary chop ranking method to compare the magnitude relationship between whole correlations in the first correlation and current maximum PSS detected value group.
7. filtering method according to claim 2, is characterized in that, after described relatively filtering, in PSS detected value, third phase closes the minimum value whether third phase pass value corresponding to position be greater than whole correlations in current maximum PSS detected value group and comprises:
Adopt binary chop ranking method to compare the magnitude relationship between whole correlations in third phase pass value and current maximum PSS detected value group.
8. filtering method according to claim 1, is characterized in that, in the current maximum PSS detected value group of described startup, relevant position sequence comprises:
Adopt binary chop ranking method by relevant position sequence in described current maximum PSS detected value group.
9. a main synchronizing sequence PSS detected value filter in Cell searching, is characterized in that, described filter comprises:
The first acquiring unit, for obtaining current PSS detected value;
Filtering decision unit, for the first relevant position of more described current PSS detected value whether with current before the second relevant position in arbitrary PSS detected value in maximum PSS detected value group identical;
Filter unit, if identical with described the second relevant position for described the first relevant position, the first correlation second correlation corresponding with the second relevant position in described arbitrary PSS detected value corresponding to the first relevant position in described current PSS detected value carried out to filtering, obtain PSS detected value after filtering; If described the first relevant position is different from described the second relevant position, do not carry out described filtering;
Comparing unit, for different from described the second relevant position when described the first relevant position, while not carrying out described filtering, relatively whether the first correlation corresponding to the first relevant position is greater than the minimum value of whole correlations in current maximum PSS detected value group;
Performance element, if be greater than described minimum value for described the first correlation, starts relevant position sequence, utilizes described current PSS detected value to replace PSS detected value corresponding to described minimum value, obtains the PSS detected value group after replacement;
Wherein, described current maximum PSS detected value group is specifically by acquisition that correlation in described current PSS detected value is sorted.
10. filter according to claim 9, it is characterized in that, described comparing unit also for, when described the first relevant position identical with described the second relevant position, first correlation with in the described arbitrary PSS detected value second relevant position corresponding correlation corresponding to the first relevant position in described current PSS detected value carries out filtering, obtain after filtering after PSS detected value, relatively after filtering, in PSS detected value, third phase closes the minimum value whether third phase pass value corresponding to position is greater than whole correlations in current maximum PSS detected value group;
Described performance element also for, if described third phase pass value is greater than described minimum value, start in current maximum PSS detected value group relevant position sequence, utilize described filtering after PSS detected value replace PSS detected value corresponding to described minimum value, obtain the PSS detected value group after replacement.
11. filters according to claim 9, is characterized in that, described filter unit specifically for:
Described PSS detected value comprises: relevant position, the correlation that relevant position is corresponding and mark frequency deviation cross product real part and imaginary part;
The second mark frequency deviation cross product real part and imaginary part in the first mark frequency deviation cross product real part in described current PSS detected value and imaginary part and described arbitrary PSS detected value are carried out to filtering.
12. filters according to claim 9, is characterized in that, described device also comprises: the first memory cell, for obtain current maximum PSS detected value group before from first group of buffer memory;
The second memory cell, is kept at second group of buffer memory for just described current maximum PSS detected value group.
13. filters according to claim 9, is characterized in that, described comparing unit specifically for: by the first correlation sequence corresponding to multiple current PSS detected value the first relevant positions, draw described current maximum PSS detected value group.
14. filters according to claim 9, is characterized in that, described comparing unit further specifically for:
Adopt binary chop ranking method to compare the magnitude relationship between whole correlations in the first correlation and current maximum PSS detected value group.
15. filters according to claim 9, is characterized in that, described comparing unit further specifically for:
Adopt binary chop ranking method to compare the magnitude relationship between whole correlations in third phase pass value and current maximum PSS detected value group.
16. filters according to claim 10, is characterized in that, described performance element specifically for:
Adopt binary chop ranking method by relevant position sequence in described current maximum PSS detected value group.
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| CN104077361B (en) * | 2014-06-09 | 2018-01-12 | 汉柏科技有限公司 | A kind of sort method and system for big data |
| US9924408B1 (en) * | 2016-08-24 | 2018-03-20 | Intel IP Corporation | Methods and devices for interference cancellation in cell search |
| CN110351826B (en) * | 2019-07-11 | 2021-07-06 | 天津市德力电子仪器有限公司 | Rapid estimation method applied to SSB RBoffset of 5GNR system |
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| CN107343286A (en) * | 2016-04-29 | 2017-11-10 | 北京展讯高科通信技术有限公司 | The detection method of user terminal and its adjacent cell |
| CN107343286B (en) * | 2016-04-29 | 2019-12-06 | 北京展讯高科通信技术有限公司 | User terminal and method for detecting adjacent cell thereof |
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