CN101951272A - Method and device for rapidly detecting TDD-LTE uplink random access preamble signal - Google Patents
Method and device for rapidly detecting TDD-LTE uplink random access preamble signal Download PDFInfo
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Abstract
The invention discloses a method for rapidly detecting a TDD-LTE uplink random access preamble signal, comprising the following steps: receiving a preamble signal sent by a user, and demodulating the preamble signal to obtain a corresponding user preamble sequence; carrying out relevant operation on the user preamble sequence and a local available cell preamble sequence to obtain a standard preamble sequence sent by the user; and obtaining a standard preamble signal sent by the user according to the standard preamble sequence. The invention also discloses a device for realizing the method. The rapid detection method and the rapid detection device can accurately detect the uplink random access preamble signal, greatly reduce the operation quantity, reduce the system storage space, quicken the product operation speed and enhance the overall product performance.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the method for quick and the device of a kind of TDD-LTE of being used for (Time Division Duplexing-Long Term Evolution, the long evolving system of TDD mode) uplink random access lead signal.
Background technology
When the TDD-LTE transmit ascending data, distribute resource or obtain uplink synchronous for transfer of data, introduce random access procedure.In this process, insert the terminal of request at random in order to identify initiation, need use arbitrary access front signal.Under competitive mode, UE (User Equipment, subscriber equipment) selects leadingly to insert at random at random, which has specifically selected leading in order to detect UE, need the targeting signal that UE sends be detected.
In the TDD-LTE system, arbitrary access front signal takies 6 Resource Block (1.08MHz) on frequency domain, and this is in order to mate the minimum transfer bandwidth of LTE system regulation.Described targeting signal produces through signal processing for the Zadoff-Chu sequence, and described sequence has good autocorrelation and cross correlation, can reduce the interference of targeting signal between neighbor cell with its conduct, and be convenient to the detection of base station.Stipulate in the TDD-LTE system that random access leader sequence available in each sub-district is 64, the targeting sequencing relevant parameter that this sub-district of user can be used can be informed by the downlink broadcast signal in the base station.Terminal from the up targeting sequencing that allow to use the sub-district, select randomly one as its insert at random leading, detect this targeting signal at the base station end, to obtain user's identify label, then this user is made and insert response, thereby make this user obtain uplink synchronous, owing between the targeting sequencing of same sub-district certain relation is arranged, in addition, targeting signal is through up-conversion, non-ideal communication channel after the down-conversion, has very big distortion, these factors can cause the base station to leading flase drop or can't discern, thereby cause user's access failure.Therefore, the base station is to guarantee that the user inserts successful primary prerequisite at random to the correct detection of targeting signal.
In the conventional detection, at first generate 64 communicty preambel signals according to 64 local available cell targeting sequencings, the targeting signal that the user who receives is sent carries out related operation with aforementioned 64 communicty preambel signals respectively then, that of relevant peaks maximum is the standard targeting signal that the user sends, processing will be carried out very large mathematical operation and memory space like this, its operand can be analyzed from the angle of mathematics: carry out relevant with a targeting signal of sub-district the targeting signal of the UE that receives, need do the computing of (4096+448) * 2-1 correlations, wherein, 4096 is baseband signal, be the length that targeting signal produces data, 448 for inserting the length of Cyclic Prefix, carry out the relevant 64 correlations computings of then will doing altogether with targeting signals all in the sub-district, i.e. the number of times of multiplying is ((4096+448) * 2-1) * 63.Again because the data of TDD-LTE are branch I, the plural number of Q two-way, per two complex multiplication need be done four real numbers and multiply each other and twice real number sum operation, with traditional directly related detection algorithm, need carry out ((4096+448) * 2-1) 63*4 multiplying of * and ((4096+448) * 2-1) * 63*2 sub-addition computing, no matter so big operand is to use software, hardware still is that software and hardware combines and handles, all need the time-delay of a very long time, this will have a strong impact on the real-time processing of data, can cause the product reaction speed very slow, not reach certain technical indicator.
Therefore, demand urgently a kind of method for quick of the TDD-LTE of being used for uplink random access lead signal being provided and installing to overcome above-mentioned defective.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method for quick and device of the TDD-LTE of being used for uplink random access lead signal, operand when adopting this method and apparatus significantly to reduce to carry out accidental access signal to detect, reduce system memory space, thereby effectively accelerate the product arithmetic speed, improve the product overall performance.
In order to solve the problems of the technologies described above, the invention provides a kind of method for quick of the TDD-LTE of being used for uplink random access lead signal, it may further comprise the steps:
Receive the targeting signal that the user sends, and the described targeting signal of demodulation is to obtain corresponding user's targeting sequencing;
Described user's targeting sequencing and local available cell targeting sequencing are made related operation to obtain the standard preamble sequences that the user sends; And
Obtain the standard targeting signal that the user sends according to described standard preamble sequences.
The present invention also provides a kind of device of realizing preceding method, and it comprises: receiver module, demodulation module, computing module and standard targeting signal generation module.Wherein, described receiver module is used to receive the targeting signal that the user sends; Described demodulation module is used for targeting signal that the described receiver module of demodulation receives to obtain corresponding user's targeting sequencing; User's targeting sequencing and local available cell targeting sequencing that described computing module is used for described demodulation module is obtained are made related operation to obtain the standard preamble sequences that the user sends; The standard preamble sequences that described standard targeting signal generation module is used for calculating according to described computing module obtains the standard targeting signal that the user sends.
Compared with prior art, the targeting signal demodulation that the method for quick of the TDD-LTE of being used for uplink random access lead signal of the present invention and device send the user who receives earlier, and then the user's targeting sequencing that obtains carried out related operation with local 64 available communicty preambel sequences, the standard targeting signal that the final user of acquisition sends, this method can be when accurately detecting uplink random access lead signal, operand when reducing input greatly, reduce system memory space, improve arithmetic speed, accelerate the product response speed, requirement of real time, the overall performance of raising product.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is used for the schematic flow sheet of an embodiment of the method for quick of TDD-LTE uplink random access lead signal for the present invention.
Fig. 2 is the detailed process schematic diagram of the step S101 of method for quick shown in Figure 1.
Fig. 3 is the detailed process schematic diagram of the step S103 of method for quick shown in Figure 1.
Fig. 4 is used for the schematic flow sheet of another embodiment of the method for quick of TDD-LTE uplink random access lead signal for the present invention.
Fig. 5 is used for the structured flowchart of an embodiment of the device for fast detecting of TDD-LTE uplink random access lead signal for the present invention.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.As mentioned above, the invention provides a kind of method for quick of the TDD-LTE of being used for uplink random access lead signal, adopt the remarkable operand that reduces when carrying out the accidental access signal detection of this method, reduce system memory space, thereby effectively accelerate the product arithmetic speed, improve the product overall performance.
Elaborate the technical scheme of the embodiment of the invention below in conjunction with accompanying drawing.Fig. 1 is used for the schematic flow sheet of an embodiment of the method for quick of TDD-LTE uplink random access lead signal for the present invention.As shown in Figure 1, the method for quick that is used for TDD-LTE uplink random access lead signal of present embodiment may further comprise the steps:
Step S101: receive the targeting signal that the user sends, and the described targeting signal of demodulation is to obtain corresponding user's targeting sequencing; Concrete, at first gather the targeting signal that user terminal sends by receiver, be mainly at hardware platform and carry out data acquisition, its process is implemented not do concrete introduction at this easily.The process of the described targeting signal of demodulation comprises that the targeting signal that will receive goes Cyclic Prefix, frequency spectrum shift, FFT conversion, separates mapping and IFFT conversion process, so just can obtain user's targeting sequencing as shown in Figure 2.Because this process strictness is the inverse operation of step S103, and hereinafter will introduce the implementation procedure of step S103 from the angle of mathematics in detail, so locate demodulation not to be described in detail.
Step S102: described user's targeting sequencing and local available cell targeting sequencing are made related operation to obtain the standard preamble sequences that the user sends.
Further, before step S102, can also comprise the step of the local available cell targeting sequencing of pre-generation.Concrete, this step comprises:
A) determine to generate the number of the derivation sequence of the quantity of leading required sequence of communicty preambel sequence and each root sequence.Targeting sequencing in the sub-district is to be obtained by 1 or a plurality of sequential derivations, if leading not enough 64 of producing by root sequence, again logic root sequence sequence number is moved one backward in the mode that increases progressively, two acquisition corresponding physical root sequence sequence number u table look-up, in the same way, it is individual leading to generate M, and the current M that generates a leading sequence number is decided to be M+1～M, so analogize, up to generation
Individual root sequence, 64 of getting the front are leading, and promptly last root sequence is only got
Individual leading.Suppose N
CSBe configured to 5, table look-up one N
CSValue is 12, and then the number of the targeting sequencing of each root sequence generation is
Individual, need altogether
Individual root sequence, 6 root sequences produce altogether 66 leading, last leading sequence is only got the front
Individual targeting sequencing.The number relation of the length of zero correlation block and root sequence sees Table one.
Table one
B), obtain the leading all sequences in the sub-district according to physics root sequence sequence number u value.
Pass through N
CSValue is these 64 the leading N of being divided into groups (being N root sequence), this N group data computing method is the same, just parameters u is different, this u value is to table look-up by the logic root sequence sequence number parameter in the system message two to obtain logic root sequence sequence number u, calculates first targeting sequencing of each group according to formula (1).Suppose that given logic root sequence sequence number is 20, needing the number of leading sequence is N=5, and the two acquisition corresponding physical root sequence sequence numbers of tabling look-up are u=11, then all the other N-1=4 groups are respectively logic root sequence number 21,22,23 and 24 corresponding physical root sequence sequence number u, table look-up two u=128, u=12, u=127, u=13 is in u value substitution formula (1), can obtain five sequences, these five sequences are referred to as leading sequence.Physics root sequence sequence number u is obtained by two (the table 5.7.2-5 in the agreement [1]) that table look-up of the logic root sequence sequence number in the system information, and the formula that calculates leading sequence is as follows:
With leading format 4 is example (this form only is applicable at TDD-LTE), the length N of targeting sequencing
ZC=139, u is by two acquisitions of tabling look-up.If 64 leading is not to be produced by a root sequence, then can produce a plurality of leading sequences by above-mentioned method.
Table two
C) described leading sequence carried out cyclic shift, to produce described communicty preambel sequence.
After generating a leading sequence, by formula (2) and (3), the targeting sequencing that generates is carried out cyclic shift left, displacement length is N
CSValue, every displacement once, produces one leading, altogether generation
Individual leading.Generate leading sequence number and be decided to be 1～M successively, be referred to as leading by a root sequential derivation this M is leading according to the order of displacement.
x
u，v(n)＝x
u((n+C
v)modN
ZC) (2)
C
v＝vN
CS，
The length value of zero correlation block is by N
CsConfiguration decides, referring to table three.
Suppose that producing sequence by following formula is: abcdefghijklmnopqrst, its length is N
ZC=20, N
CS=3, then a root sequential derivation goes out leading number and is
After carrying out cyclic shift, the 2nd leading is defghijklmnopqrstabc, the 3rd leading is ghijklmnopqrstabcdef, the 4th leading is jklmnopqrstabcdefghi, the 5th leading is mnopqrstabcdefghijkl, the 6th leading is pqrstabcdefghijklmno, and the 7th leading is stabcdefghijklmnopqr.The 1st root sequence become leading sequence, the 2nd～7 serves as reasons targeting sequencing that root sequential derivation comes out.Can obtain all targeting sequencings of sub-district, user place according to above three steps.
| N CSConfiguration | N CSValue |
| 0 | 2 |
| 1 | 4 |
| 2 | 6 |
| 3 | 8 |
| 4 | 10 |
| 5 | 12 |
| 6 | 15 |
Table three
Step S103: obtain the standard targeting signal that the user sends according to described standard preamble sequences.Concrete, as shown in Figure 3, this step specifically comprises: described standard preamble sequences is carried out the FFT conversion, mapping (this step is convenient to analyze data number of samples purpose Changing Pattern in DFT and IFFT conversion), IFFT conversion, frequency spectrum shift and the processing of inserting Cyclic Prefix.Further, the detailed process of this step is as follows:
The standard preamble sequences that described user is sent generates the standard targeting signal by following formula.Time continuous random access lead signal s (t) is defined as:
Wherein, β
PRACHAmplitude zoom factor for the control transmitting power;
x
U, v(n): for described user sends standard preamble sequences;
K=Δ f/ Δ f
RAProportionate relationship for the sub-carrier separation between random access guiding and the upstream data;
Δ f=15000 is a uplink business data when shining upon in frequency domain, the interval of subcarrier;
Δ f
RA=7500 are random access sequence when shining upon, the interval of subcarrier in frequency domain;
Δ f
RA: be the sub-carrier separation of random access lead code;
In communication system, what equipment received and sent generally is digital signal, so need be analog signal conversion digital signal, establishes
The employing sampling frequency is f=1/T
s, with t=iT
sSubstitution s (t) then has:
The discrete form of s (t)
Should discrete baseband signal be divided into DFT conversion and IFFT conversion, see Fig. 2.
If m=i-T
CP, then
Data length is 4096 points, and Cyclic Prefix is added in the data front, considers 2 sample value at a distance of 4096, establishes m
1=m, m
2=m+4096 then has:
By above proof, Cyclic Prefix is duplicating of data, promptly is data division T backmost
CPData copy to the data front and come.
When specific implementation, can call ready-made module and carry out quick computing, if when the data of require handling are a lot, these are fast doubly more a lot of on speed than direct calculating, thereby satisfy the requirement that signal is handled in real time.Below from the operand of the method for quick of the angle analysis present embodiment of mathematics.Mainly FFI from the standard targeting signal and DFT processing and two aspects of related operation are analyzed.
(1) FFI in the standard targeting signal and DFT processing aspect.Existing method is 64 standard preamble sequences in the sub-district, user place all to be handled generate 64 local available cell targeting signals, and the method for quick of present embodiment only generates the standard targeting signal that the user sends to the standard preamble sequences that detected user sends.The former is 64 times of the latter for this respect operand.
(2) related operation amount aspect.In the present embodiment, because the length of targeting sequencing is 139, so user's targeting sequencing and local 64 available targeting sequencings are carried out the multiplying that related operation need carry out 63 plural numbers of (139*2-1) *.And prior art need be (4096+448) * 2-1) multiplying of * 63*2, this shows that the related operation amount of present embodiment reduces greatly.
In sum, the method for quick of present embodiment can reduce operand greatly, reduces system memory space, accelerates the product arithmetic speed, improves the product overall performance.
Fig. 4 is used for the schematic flow sheet of other embodiment of method for quick of TDD-LTE uplink random access lead signal for the present invention.As shown in Figure 4, the method for quick that is used for TDD-LTE uplink random access lead signal of present embodiment may further comprise the steps:
Step S201: receive the targeting signal that the user sends, and the described targeting signal of demodulation is to obtain corresponding user's targeting sequencing.
Step S202: with described user's targeting sequencing and local available cell targeting sequencing ask cross-correlation function with obtain in the described local available cell targeting sequencing with described user's targeting sequencing with the sequence of root and derive from sequence.Concrete, 64 available in the user's targeting sequencing that obtains after the demodulation and sub-district communicty preambel sequences are asked cross-correlation function, if cross-correlation function mould value square is N
ZC=139, be and leadingly these sequences all being excluded that UE sends for the different root sequences or the sequence of different derivations, remaining just be leading identical root sequence and the derivation sequence thereof that sends with UE.
Need to prove, before step S202, can comprise the step of the described local available cell targeting sequencing of pre-generation equally, identical among this step and the embodiment one do not repeat them here.
Step S203: will carry out related operation to obtain the standard preamble sequences that the user sends with described user's targeting sequencing with the sequence and the derivation sequence thereof of root in described user's targeting sequencing and the local available cell targeting sequencing.Particularly, demodulation user's targeting sequencing that obtains and the sequence that step S202 obtains are made related operation, the targeting sequencing in the sub-district, user place of correlation peak maximum is the standard preamble sequences of UE transmission.
Step S204: obtain the standard targeting signal that the user sends according to described standard preamble sequences.This step is identical with step S103, omits detailed description at this.
In the present embodiment, when adopting the method for quick of present embodiment, leading 64 an of sub-district all by a root sequential derivation, and detect that (probability of this kind situation is very little under the situation of targeting sequencing that the 64th targeting sequencing just detect the standard that sends into the user, probability is 1/6 * 64), its related operation amount is maximum, carry out the multiplying of 63 plural numbers of (139*2-1) *, and this moment, amount of calculation was identical with last embodiment.And in the ordinary course of things, the related operation amount is (139*2-1) * (N+M), and wherein, N is the number of leading sequence in the sub-district, user place, and M is a same number that derives targeting sequencing, and concrete value sees Table shown in two.And the analysis by preamble, traditional algorithm need be (4096+448) * 2-1) multiplying of * 63*2, this shows that the method for quick of present embodiment has further reduced the complex multiplication operation amount on the basis of last embodiment aspect related operation.In addition, aspect FFI in the standard targeting signal and the DFT processing.Existing method is 64 standard preamble sequences in the sub-district, user place all to be handled generate 64 local available cell targeting signals, and the method for quick of present embodiment only generates the standard targeting signal that the user sends to the standard preamble sequences that detected user sends.The former is 64 times of the latter for this respect operand.In sum, the method for quick of present embodiment can reduce operand greatly, reduces system memory space, accelerates the product arithmetic speed, improves the product overall performance.
Fig. 5 is used for the structured flowchart of an embodiment of the device for fast detecting of TDD-LTE uplink random access lead signal for the present invention.As shown in Figure 5, the device for fast detecting that is used for TDD-LTE uplink random access lead signal of present embodiment comprises receiver module 51, demodulation module 52, computing module 53, standard targeting signal generation module 54 and communicty preambel sequence generation module 55.Wherein, described communicty preambel sequence generation module 55 is used for generating in advance described local available cell targeting sequencing; Described receiver module 51 is used to receive the targeting signal that the user sends; Described demodulation module 52 is used for targeting signal that the described receiver module 51 of demodulation receives to obtain corresponding user's targeting sequencing; Described computing module 53 is used for the local available cell targeting sequencing of user's targeting sequencing of described demodulation module 52 acquisitions and 55 generations of described communicty preambel sequence generation module is made related operation to obtain the standard preamble sequences that the user sends; Described standard targeting signal generation module 54 is used for obtaining the standard targeting signal that the user sends according to the standard preamble sequences that described computing module 53 calculates.
Further, described computing module 53 comprises first computing unit 531 and second computing unit 532, wherein, described first computing unit 531 is used for asking cross-correlation function to obtain described local available cell targeting sequencing and sequence and the derivation sequence thereof of described user's targeting sequencing with root described user's targeting sequencing and local available cell targeting sequencing; Described second computing unit 532 be used for described user's targeting sequencing and described first computing unit are obtained with described user's targeting sequencing with the sequence of root and derive from sequence and carry out related operation to obtain the standard preamble sequences that the user sends.
As indicated above, the device for fast detecting that is used for TDD-LTE uplink random access lead signal of present embodiment can fast detecting TDD-LTE uplink random access lead signal, and reduces operand greatly, reduces system memory space, accelerate the product arithmetic speed, improve the product overall performance.
Above disclosed is preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (8)
1. a method for quick that is used for TDD-LTE uplink random access lead signal is characterized in that, comprising:
Receive the targeting signal that the user sends, and the described targeting signal of demodulation is to obtain corresponding user's targeting sequencing;
Described user's targeting sequencing and local available cell targeting sequencing are made related operation to obtain the standard preamble sequences that the user sends; And
Obtain the standard targeting signal that the user sends according to described standard preamble sequences.
2. method for quick according to claim 1 is characterized in that, described user's targeting sequencing and local available cell targeting sequencing is made related operation comprise with the step of the standard preamble sequences that obtains the user and send:
With described user's targeting sequencing and local available cell targeting sequencing ask cross-correlation function with obtain in the described local available cell targeting sequencing with described user's targeting sequencing with the sequence of root and derive from sequence; And
To carry out related operation to obtain the standard preamble sequences that the user sends with described user's targeting sequencing with the sequence and the derivation sequence thereof of root in described user's targeting sequencing and the local available cell targeting sequencing.
3. method for quick according to claim 1 and 2 is characterized in that, also comprises: generate described local available cell targeting sequencing in advance.
4. method for quick according to claim 3 is characterized in that, the step of the described local available cell targeting sequencing of described pre-generation comprises:
The number of the quantity of the leading sequence that definite generation communicty preambel sequence is required and the derivation sequence of each root sequence;
Obtain logic root sequence sequence number u value according to system message, and obtain corresponding described leading sequence; And
Described leading sequence carried out cyclic shift, to produce all described local available cell targeting sequencings.
5. method for quick according to claim 1 and 2 is characterized in that, the step that obtains the standard targeting signal of user's transmission according to described standard preamble sequences comprises:
Described standard preamble sequences is carried out Fourier transform, mapping, inverse Fourier transform, frequency spectrum shift and the processing that adds Cyclic Prefix;
Then the described targeting signal of demodulation removes Cyclic Prefix with the described targeting signal that the step that obtains corresponding user's targeting sequencing is specially receiving, and frequency spectrum shift, is separated mapping and inverse Fourier transform is handled at Fourier transform.
6. a device for fast detecting that is used for TDD-LTE uplink random access lead signal is characterized in that, comprising:
Receiver module is used to receive the targeting signal that the user sends;
Demodulation module is used for targeting signal that the described receiver module of demodulation receives to obtain corresponding user's targeting sequencing;
Computing module, the user's targeting sequencing and the local available cell targeting sequencing that are used for described demodulation module is obtained are made related operation to obtain the standard preamble sequences that the user sends; And
Standard targeting signal generation module, the standard preamble sequences that is used for calculating according to described computing module obtains the standard targeting signal that the user sends.
7. device for fast detecting according to claim 6 is characterized in that, described computing module comprises:
First computing unit is used for asking cross-correlation function to obtain described local available cell targeting sequencing and sequence and the derivation sequence thereof of described user's targeting sequencing with root described user's targeting sequencing and local available cell targeting sequencing; With
Second computing unit, be used for described user's targeting sequencing and described first computing unit are obtained with described user's targeting sequencing with the sequence of root and derive from sequence and carry out related operation to obtain the standard preamble sequences that the user sends.
8. device for fast detecting according to claim 1 and 2 is characterized in that, also comprises:
Communicty preambel sequence generation module is used for generating in advance described local available cell targeting sequencing.
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| CN1988525A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Synchronizing method for orthogonal frequency division multiplex system |
| CN101405964A (en) * | 2006-03-29 | 2009-04-08 | Posdata株式会社 | Method and apparatus for searching for cells utilizing downlink preamble signal |
| US20090232231A1 (en) * | 2008-03-17 | 2009-09-17 | Nokia Corporation | Frequency estimation |
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| CN1988525A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Synchronizing method for orthogonal frequency division multiplex system |
| CN101405964A (en) * | 2006-03-29 | 2009-04-08 | Posdata株式会社 | Method and apparatus for searching for cells utilizing downlink preamble signal |
| US20090232231A1 (en) * | 2008-03-17 | 2009-09-17 | Nokia Corporation | Frequency estimation |
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