CN103297995B - The acquisition methods of master sync signal timing and device - Google Patents
The acquisition methods of master sync signal timing and device Download PDFInfo
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- CN103297995B CN103297995B CN201210048678.8A CN201210048678A CN103297995B CN 103297995 B CN103297995 B CN 103297995B CN 201210048678 A CN201210048678 A CN 201210048678A CN 103297995 B CN103297995 B CN 103297995B
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Abstract
The present invention relates to the acquisition methods of a kind of master sync signal timing, in order to the second master sync signal timing of the first master sync signal timing acquisition second precision based on the first precision, this second precision is higher than this first precision, the timing of this first master sync signal is to obtain the reception data of the first sample rate, the method comprises the following steps: according to the first determined master sync signal position of master sync signal timing, receive the data containing master sync signal with the second sample rate, this second sample rate is greater than this first sample rate; Organize sampled value from containing reading in proportion the data of master sync signal, each group sampled value has different time migrations relative to the first master sync signal timing more; Respectively filtering extraction is carried out to each group of sampled value; Calculate the correlation of each group of sampled value and local master sync signal; And choose that maximum group time migration corresponding to sampled value of correlation as the second master sync signal timing.
Description
Technical field
The present invention relates to the mobile communication terminal of Long Term Evolution (LTE) system, especially relate to the method and apparatus obtaining master sync signal timing at mobile communication terminal.
Background technology
In a wireless communication system, terminal is the ID and the frame timing information that obtain community in one of the vital task of cell search phase, and these information are usually entrained by the signal in system with pilot tone character.
In Long Term Evolution (LongTermEvolution, LTE) system, the ID (being designated as below: NID) of community is made up of NID (1) and NID (2) two parts, that is:
N
ID＝N
ID (1)+N
ID (2)
Wherein:
N
iD (1)entrained by auxiliary synchronous signals (SSS, SecondarySynchronizationSignal), each N
iD (2)a corresponding specific known array.
N
iD (2)entrained by master sync signal (PSS, PrimarySynchronizationSignal), each N
iD (2)a corresponding specific known array.
PSS signal is positioned on 62, the centre subcarrier of specific OFDM (OFDM) symbol, is distributed on each 31 subcarriers in direct current subcarrier both sides specifically, as shown in Figure 1.In Fig. 1, direct current subcarrier and each 5 idle sub-carrier being positioned at shown 62 subcarrier both sides do not send any signal.The effect of idle sub-carrier is for providing one to protect interval between PSS and normal data signals.
Current PSS signal timing acquisition strategy uses 1.4MHz bandwidth Received signal strength, data will be received down-sampled to 0.96MHz, data after down-sampled are carried out related operation with the local PSS sequence stored, finds according to the result of related operation the N that PSS signal is corresponding
iD (2)and PSS signal is receiving the original position in data.
But the timing accuracy that the current PSS search phase exports is poor, sometimes can cause PSS error detection, and community ID is caused to detect mistake further.Even if the detection success of PSS, also can cause SSS Signal reception, MIB receptivity to be deteriorated due to timing accuracy difference.In addition, also there will be due to problems such as timing accuracy difference lead to the failure when switching or weigh synchronous.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of acquisition methods and the device that improve the master sync signal timing of precision.
One aspect of the present invention proposes the acquisition methods of a kind of master sync signal timing, perform at mobile communication terminal, in order to the second master sync signal timing of the first master sync signal timing acquisition second precision based on the first precision, described second precision is higher than described first precision, described first master sync signal timing is to obtain the reception data of the first sample rate, said method comprising the steps of: according to the described first determined master sync signal position of master sync signal timing, the data containing described master sync signal are received with the second sample rate, described second sample rate is greater than described first sample rate, read in proportion from the data containing described master sync signal and organize sampled value more, each group sampled value has different time migrations relative to described first master sync signal timing, respectively filtering extraction is carried out to each group of sampled value, calculate the correlation of each group of sampled value and local master sync signal, and choose that maximum group time migration corresponding to sampled value of correlation as described second master sync signal timing.
In one embodiment of this invention, described first precision and the second precision ratio in time equal the ratio of described second sample rate and described first sample rate.
In one embodiment of this invention, described first precision and the second precision ratio are in time less than the ratio of described second sample rate and described first sample rate.
In one embodiment of this invention, the time interval between adjacent sample values can be determined according to described second precision.
In one embodiment of this invention, the reading ratio of described sampled value is relevant with the ratio of described first sample rate to described second sample rate.
In one embodiment of this invention, said method also comprise repeatedly obtain described second master sync signal timing and average.
In one embodiment of this invention, described mobile communication terminal is LTE terminal.
Another aspect of the present invention proposes the acquisition device of a kind of master sync signal timing, in order to the second master sync signal timing of the first master sync signal timing acquisition second precision based on the first precision, described second precision is higher than described first precision, described first master sync signal timing is to obtain the reception data of the first sample rate, and described device comprises:
For according to the described first determined master sync signal position of master sync signal timing, receive the device of data containing described master sync signal with the second sample rate, wherein said second sample rate is greater than described first sample rate;
For reading the device of many group sampled values from the data containing described master sync signal in proportion, each group sampled value has different time migrations relative to described first master sync signal timing;
For carrying out the device of filtering extraction respectively to each group of sampled value;
For calculating the device of the correlation of each group of sampled value and local master sync signal; And
For choosing the device of the time migration corresponding to that maximum group sampled value of correlation as described second master sync signal timing.
In one embodiment of this invention, described first precision and the second precision ratio in time equal the ratio of described second sample rate and described first sample rate.
In one embodiment of this invention, described first precision and the second precision ratio are in time greater than the ratio of described second sample rate and described first sample rate.
In one embodiment of this invention, the time interval between adjacent sample values determines according to described second precision.
In one embodiment of this invention, the reading ratio of described sampled value is relevant with the ratio of described first sample rate to described second sample rate.
In one embodiment of this invention, to the device that the described second master sync signal timing repeatedly obtained is averaged.
In one embodiment of this invention, described device is incorporated into LTE terminal.
The present invention, owing to adopting above technical scheme, makes it compared with prior art, and on the basis of rough PSS timing, the lower needs of the general situation secondary data that receives just effectively can improve timing accuracy more.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the frequency domain distribution schematic diagram of master sync signal (PSS) in specific OFDM symbol.
Fig. 2 illustrates rough PSS timing diagram.
Fig. 3 illustrates the meticulous PSS timing method flow process of one embodiment of the invention.
Fig. 4 illustrates meticulous according to an embodiment of the invention PSS timing diagram.
Fig. 5 illustrates correlation | r (m) | and with the relation of time migration.
Embodiment
Following embodiment of the present invention describes the method according to obtaining meticulous master sync signal (PSS) timing.Embodiments of the invention based on existing PSS timing, for the purpose of difference, can be referred to as rough PSS timing hereinafter.Rough PSS timing is under asynchronous regime, and mobile communication terminal does not know the N that PSS signal is corresponding
iD (2)with the general timing position of PSS signal required for the step of carrying out.Embodiments of the invention be then at synchronous regime or mobile communication terminal after rough PSS timing, roughly known the N that PSS signal is corresponding
iD (2)and the timing carried out after rough timing information, referred to here as meticulous PSS timing.
Fig. 2 illustrates rough PSS timing diagram.With reference to shown in Fig. 2, it is first down-sampled step 201.General way first arrives 0.96MHz by down-sampled for the 1.92MHz sampled signal of 5ms+2sym (symbol).Then, in step 203, the PSS signal of the Received signal strength after down-sampled and mobile communication terminal this locality is done relevant.Local PSS signal generates in step 202.Finally, by judging the initial timing and the N that obtain PSS signal
iD (2).
In order to improve the accuracy of judgement, alternatively, N (N is positive integer) data can be received and carry out rough PSS timing, and require the timing of each reception data and the front timing slip once receiving data
this is deteriorated because phase ambiguity time down-sampled result in the correlation receiving data and local PSS signal to prevent.The sampling clock used due to rough PSS timing is 0.96MHz, and therefore the precision weighed with the time of rough timing is for 32T.Like this, the initial position of PSS can be designated as 32nT.At this, T is that the minimum of system requires the time interval, and its size is
unit is second.
For the purpose of difference, below the sample rate 0.96MHz in rough PSS timing is called the first sample rate, the rough timing of PSS signal is called a PSS timing, and rough timing accuracy is called the first precision.
Fig. 3 illustrates the meticulous PSS timing method flow process of one embodiment of the invention.With reference to shown in Fig. 3, first in step 301, according to the determined PSS initial position of a PSS timing, receive the data containing PSS signal with the second sample rate.Because the second sample rate determines the meticulous PSS timing maximal accuracy that can reach, therefore the second sample rate should be greater than aforesaid first sample rate (such as 0.96MHz), makes the second precision that meticulous PSS regularly reaches higher than the first precision.At this, the time span receiving data only need contain the possible scope of PSS signal.Generally speaking, the time duration of reception can be 1ms.
In step 302, from the data containing PSS signal, read many groups sampled value relative to a PSS timing with different time migration mT in proportion.Because the PSS timing of the first precision cannot meet required precision, therefore from the reception data of the second sample rate, extract the higher sampled value of precision.Precision is presented as the time interval in time.Such as consider that the first precision is 32T, many groups sampled value that time interval Δ T is 16T can be extracted, so that the second precision is brought up to 16T, i.e. 2 times of the first precision.Similarly, precision can be brought up to 8T, 4T, 2T, 1T etc., time interval Δ T-phase should be reduced into 8T, 4T, 2T, 1T etc. respectively.
After the time, interval delta T was determined, each group sampled value can be determined relative to the time migration of the initial position (such as 32nT) of PSS.Such as when time interval delta T is 8T, the time migration mT of each group sampled value can be respectively-16T ,-8T, 0 ,+8T ,+16T}, comprise 5 groups of sampled values altogether.When time interval delta T is 2T, the time migration mT of each group of sampled value can be respectively-16T ,-14T ,-12T ,-10T ,-8T ,-6T ,-4T ,-2T, 0 ,+2T ,+4T ,+6T ,+8T ,+10T ,+12T ,+14T ,+16T} etc., comprise 17 groups of sampled values altogether.The time interval, Δ T was shorter, and the group number of sampled value is more.
In step 303, respectively filtering extraction is carried out to each group of sampled value.Such as, make each group of sampled value with different time skew mT respectively by decimation filter.
In step 304, calculate the correlation of each group of sampled value and local master sync signal | r (m) |.
With time interval Δ T for 8, time migration mT is respectively-16T ,-8T, 0 ,+8T ,+16T each group of sampled value calculate correlation with local master sync signal respectively | r (m) |.
In step 305, choose that maximum group time migration corresponding to sampled value of correlation as the 2nd PSS timing, i.e. the meticulous PSS timing of the present embodiment.
Correlation | r (m) | higher, the skew representing sampled value and the local PSS receiving PSS signal is less.Therefore, choose maximum correlation by sequence | r (m) |, the time migration mT of its correspondence is desired meticulous PSS timing k
pss, be formulated as follows:
Alternatively, in order to further improve the precision of meticulous PSS timing estimation, can the 2nd PSS timing be obtained for many times as step 301-305 and be averaged in step 305, with mean value
as final PSS timing output, formula is as follows:
At this, each the 2nd PSS that obtains is regularly that the 2nd PSS timing obtained also is all relative to PSS skew regularly with a PSS timing for the data of benchmark reception containing PSS signal.
In an embodiment of the present invention, the second sample rate used in step 301 is 30.72MHz, and this is 32 times of the first sample rate (0.96MHz), and this allows the maximal accuracy of meticulous PSS timing to reach 1T.In one embodiment, the first precision and the second precision ratio in time can equal the ratio of the second sample rate and the first sample rate.For example, the first precision of rough PSS timing is 32T, and the first sample rate is 0.96MHz, and the second precision can be 8T.First precision and the second precision ratio in time are preferably chosen integer ratio and are calculated and signal transacting to facilitate.
Certainly, in another embodiment, the first precision and the second precision ratio in time can be less than the ratio of the second sample rate and the first sample rate.Use second sample rate of 30.72MHz, can make in 1-32T, to choose the second different precision during subsequent treatment.Like this, when reading sampled value in step 302, the time interval Δ T between adjacent sample values can determine according to the second precision.Such as, the second precision can be 16T, 8T, 4T, 2T or 1T, and correspondingly, the time interval Δ T between adjacent sample values can be 16T, 8T, 4T, 2T or 1T.The each group of sampled value that step 302 reads can be formulated as follows:
y(m)＝[y(32·n·T
s+Δ·mT
s)，y(32·(n+1)·T
s+Δ·mT
s)，…，y(32·(n+63)·T
s+Δ·mT
s)]，
In an embodiment of the present invention, the reading ratio of each group of sampled value in step 302 is relevant with the ratio of the first sample rate to the second sample rate.Such as, when the second sample rate (as 30.72MHz) is 32: 1 with the ratio of the first sample rate (as 0.96MHz), each group sampled value is the ratio reading in 32: 1.
Correspondingly, step 303 be also carry out 32: 1 filtering extraction.
Fig. 4 illustrates meticulous according to an embodiment of the invention PSS timing diagram.The framework that this schematic diagram adopts and Fig. 2 is similar, and can perform in the baseband processor of LTE terminal.Contain the data of PSS signal at the frequency reception according to 30.72MHz after, in step 401, the ratio according to 32: 1 extracts each group of sampled value, as follows:
y(m)＝[y(32·n·T
s+Δ·mT
s)，y(32·(n+1)·T
s+Δ·mT
s)，…，y(32·(n+63)·T
s+Δ·mT
s)]，
Then in step 402, y (m) signal is obtained y through 32: 1 decimation filters
d(m),
In step 404, calculate y
d(m) and local PSS signal s
nid2between correlation | r (m) |.Local PSS signal s
nid2can calculate in step 403 and obtain.At this, owing to being aware of rough PSS timing, therefore do not need meticulous for the data full entry of 1ms timing computing, only need to get the data division containing PSS signal.
Last in step 405, according to correlation | r (m) | obtain accurate PSS timing:
In step 404, y
dm () signal frequency is 0.96MHz, comparison diagram 4 and Fig. 2 can find, step 403,404 is in fact the same with step 202,203.Therefore rough PSS timing and meticulous PSS timing reusable part of module.
Fig. 5 illustrates when Δ=1, correlation | r (m) | and with the relation of time migration.Phase relations different is as can see from Figure 5 very large on correlated results impact, and also can see from Fig. 5 can according to correlated results | r (m) | obtain the meticulous timing information of PSS signal.From figure, also can be readily appreciated that why at rough PSS regularly, each timing receiving data will have certain deviation.
Compare existing rough PSS timing, the additional fine PSS timing that the embodiment of the present invention increases, the lower needs of the general situation secondary data (generally only needing 1ms) that receives just effectively can improve timing accuracy more, and embodiments of the invention can multiplexing existing local PSS signal generation module and PSS coherent detection module when implementing, little to the change of existing framework.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (14)
1. the acquisition methods of a master sync signal timing, perform at mobile communication terminal, in order to the second master sync signal timing of the first master sync signal timing acquisition second precision based on the first precision, described second precision is higher than described first precision, described first master sync signal timing is to obtain the reception data of the first sample rate, said method comprising the steps of:
According to the described first determined master sync signal position of master sync signal timing, receive the data containing described master sync signal with the second sample rate, described second sample rate is greater than described first sample rate;
Read in proportion from the data containing described master sync signal and organize sampled value more, each group sampled value has different time migrations relative to described first master sync signal timing;
Respectively filtering extraction is carried out to each group of sampled value;
Calculate the correlation of each group of sampled value and local master sync signal; And
Choose that maximum group time migration corresponding to sampled value of correlation as described second master sync signal timing.
2. the method for claim 1, is characterized in that, described first precision and the second precision ratio in time equal the ratio of described second sample rate and described first sample rate.
3. the method for claim 1, is characterized in that, described first precision and the second precision ratio are in time less than the ratio of described second sample rate and described first sample rate.
4. method as claimed in claim 3, it is characterized in that, the time interval between adjacent sample values determines according to described second precision.
5. the method for claim 1, is characterized in that, the reading ratio of described sampled value is relevant with the ratio of described first sample rate to described second sample rate.
6. the method for claim 1, is characterized in that, also comprises and repeatedly obtains described second master sync signal timing and average.
7. the method for claim 1, is characterized in that, described mobile communication terminal is LTE terminal.
8. the acquisition device of a master sync signal timing, in order to the second master sync signal timing of the first master sync signal timing acquisition second precision based on the first precision, described second precision is higher than described first precision, described first master sync signal timing is to obtain the reception data of the first sample rate, and described device comprises:
For according to the described first determined master sync signal position of master sync signal timing, receive the device of data containing described master sync signal with the second sample rate, wherein said second sample rate is greater than described first sample rate;
For reading the device of many group sampled values from the data containing described master sync signal in proportion, each group sampled value has different time migrations relative to described first master sync signal timing;
For carrying out the device of filtering extraction respectively to each group of sampled value;
For calculating the device of the correlation of each group of sampled value and local master sync signal; And
For choosing the device of the time migration corresponding to that maximum group sampled value of correlation as described second master sync signal timing.
9. device as claimed in claim 8, is characterized in that, described first precision and the second precision ratio in time equal the ratio of described second sample rate and described first sample rate.
10. device as claimed in claim 8, is characterized in that, described first precision and the second precision ratio are in time greater than the ratio of described second sample rate and described first sample rate.
11. devices as claimed in claim 10, is characterized in that, the time interval between adjacent sample values determines according to described second precision.
12. devices as claimed in claim 8, is characterized in that, the reading ratio of described sampled value is relevant with the ratio of described first sample rate to described second sample rate.
13. devices as claimed in claim 8, is characterized in that, also comprise the device of averaging to the described second master sync signal timing repeatedly obtained.
14. devices as claimed in claim 8, it is characterized in that, described device is incorporated into LTE terminal.
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