CN105553911B - A kind of generation method and device of preamble sequence - Google Patents
A kind of generation method and device of preamble sequence Download PDFInfo
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- CN105553911B CN105553911B CN201510925275.0A CN201510925275A CN105553911B CN 105553911 B CN105553911 B CN 105553911B CN 201510925275 A CN201510925275 A CN 201510925275A CN 105553911 B CN105553911 B CN 105553911B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
The invention discloses a kind of generation method of preamble sequence and devices,Default graded filter group,The graded filter group includes first filter,Second filter and third filter,The first filter and the second filter stopband value are set as Fstop=Fs/3 Fpass,The third filter stop bend value is set as Fstop=Fs/2 Fpass,Fs is the corresponding sample rate of the system bandwidth,Fpass is the half of the target preamble sequence occupied bandwidth,First filter,The coefficient of second filter and third filter is respectively less than Direct-type FIR low pass filter,Reduce computing cost,And it is directed to different system bandwidths and Preamble format,Only need 3 kinds of filters of design,Reduce development cost.
Description
Technical field
The present invention relates to wireless communication technology fields, and more specifically, it relates to a kind of lifes of preamble sequence
At method and device.
Background technology
LTE (Long Term Evolution system, long term evolution) system is widely considered quasi- 4G channel radios
Letter system, it has the transmission rate of downlink 100M uplinks 50M, while supporting higher movement speed (350km/h) and bigger
Coverage radius of cell (100 kilometers), support per 200 users of cell simultaneously it is online.In addition to this, LTE also has flexible
The features such as band width configuration (1.4MHz~2.0MHz), support multi-media broadcasting service and end-to-end QoS.
Before normal subscriber data traffic, UE (User Experience, user experience) first has to be connect at random
Enter process, includes the steps that UE sends random access leader sequence (preamble) in random access procedure, in this step, packet
Include the generation of preamble sequences.
The time domain constituted modes of preamble sequences as shown in Figure 1, wherein 101 be cyclic prefix (Cyclic Prefix),
102 be the time domain sequences of Preamble, TCPFor the length of cyclic prefix, TSEQFor the length of time domain sequences.Preamble is according to length
Degree difference is divided into five kinds of formats, as shown in table 1, wherein TsFor LTE system time sampling sample spacings, length Ts=1/
(15000 × 2048) second.
Table 1
| Preamble format | TCP | TSEQ |
| 0 | 3168·Ts | 24576·Ts |
| 1 | 21024·Ts | 24576·Ts |
| 2 | 6240·Ts | 2·24576·Ts |
| 3 | 21024·Ts | 2·24576·Ts |
| 4 | 448·Ts | 4096·Ts |
Table 2
| Preamble format | NZC |
| 0–3 | 839 |
| 4 | 139 |
In the prior art, a kind of generation equipment of preamble sequences is disclosed, specifically as shown in Fig. 2, being set based on this
It is standby, following method may be used and generate preamble sequences：Frequency domain ZC (Zadoff-Chu) sequence F is generated by 301~303u
(k), k=0,1 ..., NZC- 1, wherein NZCFor sequence length, when leading format is 0~3, NZCIt is 839, when leading format is
When 4, NZCIt is 839, it is specific as shown in table 2；304 according to the format of target preamble sequence and time domain sampling number by the frequency
Domain ZC sequences Fu(k) default IFFT (inverse discrete Fourier transform) accordingly is carried out, time domain sequences H is obtainedu(i), i=0,1 ...,
Nifft- 1, wherein Nifft=1024 or 2048；The 305 time domain sequences H exported 304u(i) it is L that interpolated unit, which obtains length,
Time domain sequences Uu(t), t=0,1 ... L-1, then to time domain sequences Uu(t) phase place generates time domain Preamble sequences Pu
(0),Pu(1),…,Pu(L-1).Wherein, the length of L is the corresponding time-domain sampling points of Preamble sequences, specific such as table 3
Numerical value in (Preamble format 0) and table 4 (Preamble format 4) shown by IFFT point ordered series of numbers.
Table 3
| System bandwidth (MHz) | Sample rate (MHz) | IFFT point number (Format 0) |
| 20 | 30.72 | 24576 |
| 10 | 15.36 | 12288 |
| 5 | 7.68 | 6144 |
Table 4
| System bandwidth (MHz) | Sample rate (MHz) | IFFT point number (Format 4) |
| 20 | 30.72 | 4096 |
| 10 | 15.36 | 2048 |
| 5 | 7.68 | 1024 |
Wherein, interpolating unit can be realized by up-sampling the combination of interpolating unit and Direct-type FIR low pass filter, but
It is that, for the IFFT to count greatly, if using traditional Direct-type FIR Filter low-pass filtering, coefficient is very long, computing cost
Greatly.For example, IFFT point number is 24576, for the system bandwidth of 20MHz, the IFFT by 2048 points is needed to up-sample interpolation 12
Times, corresponding Direct-type FIR low pass filter coefficient length will by it is tens of or hundred in terms of.Moreover, for different Preamble
The combination of format (format) and BW (system bandwidth), the interpolating unit are needed through different up-sampling interpolating unit and straight
The combination of direct type FIR low pass filter is realized.In the prior art, to the various combination of all Preamble format and BW,
Need individually designed Direct-type FIR low pass filter.In this way, up to 6 kinds of the Direct-type FIR low pass filter designed is needed in total,
Increase development cost.
Invention content
In view of this, the present invention provides a kind of generation method of preamble sequence and device, it is existing to overcome
Interpolating unit can be realized by up-sampling the combination of interpolating unit and Direct-type FIR low pass filter in technology, still, for
The IFFT to count greatly, if using traditional Direct-type FIR Filter low-pass filtering, coefficient is very long, and computing cost is big, with
And the combination for different Preamble format (format) and BW (system bandwidth), the interpolating unit are needed by not
With the combination of up-sampling interpolating unit and Direct-type FIR low pass filter realize.In the prior art, to all Preamble
The various combination of format and BW needs individually designed Direct-type FIR low pass filter.In this way, needing the Direct-type designed in total
Up to 6 kinds of FIR low pass filter, the problem of increasing development cost.
To achieve the above object, the present invention provides the following technical solutions：
A kind of generation method of preamble sequence, the method includes：
Generate frequency domain ZC sequence；
The inverse discrete Fourier transform that the frequency domain ZC sequence is carried out to small point, obtains time domain sequences；
Up-sampling interpolation multiple is determined according to the time-domain sampling of target preamble sequence points and the small point；
It is determined and the system bandwidth and corresponding point of the up-sampling interpolation multiple from default graded filter group
The combination of section filter, the graded filter group includes first filter, second filter and third filter, and described the
One filter and the second filter stopband value are set as Fstop=Fs/3-Fpass, the third filter stop bend value
It is set as Fstop=Fs/2-Fpass, Fs is the corresponding sample rate of the system bandwidth, and Fpass is the target preamble
The half of sequence occupied bandwidth (1.08MHz)；
Using the combination of the graded filter to the time domain sequences into row interpolation, the time domain sequence after length transition is obtained
Row；
Time domain sequences after the length transition are subjected to phase transition, obtain the time domain sequences after phase transition；
After being carried out accordingly to the time domain sequences after the phase transition according to the format of the target preamble sequence
Continuous processing；
The time domain sequences after cyclic prefix to the subsequent processing are added, target preamble sequence is obtained.
Preferably, in the inverse discrete Fourier transform that the frequency domain ZC sequence is carried out to small point, time domain sequence is obtained
Before row, the method further includes：
The target preamble sequence is determined according to the format of the target preamble sequence and system bandwidth
Time-domain sampling is counted；
It is counted according to the time-domain sampling of the target preamble sequence and determines the small point of inverse discrete Fourier transform.
Preferably, the time domain sequences by after the length transition carry out phase transition, obtain after phase transition when
Domain sequence, specifically includes：
Phase rotation angle is obtained according to the initial position of preset frequency domain resource；
Time domain sequences after the length transition are multiplied with the phase rotation angle, phase transition is carried out, obtains phase
The transformed time domain sequences in position.
Preferably, in the first filter, Fs=7.68MHz, Fpass=0.54MHz, in the second filter,
Fs=3.84MHz, Fpass=0.54MHz, in the third filter, Fs=15.36MHz, Fpass=0.54MHz.
Preferably, length is obtained into row interpolation to the time domain sequences in the combination using the graded filter to turn
Before time domain sequences after changing, the method further includes：
Judge in the combination of the graded filter whether to include the first filter and/or the second filter,
Obtain the first judging result；
When first judging result be comprising when, obtain the filter of the first filter and/or the second filter
Wave system number；
The filter factor is divided into three groups, one subfilter of every group of correspondence；It determines and filters system in three subfilters
Number asymmetric two subfilter h0 (n) and h1 (n)；According to formula h 0* (n)=h0 (n)-h1 (n), h1* (n)=h0 (n)+
The h0 (n) and h1 (n) are transformed to the symmetrical subfilter h0* (n) of filter factor and h1* (n) by h1 (n)；
By the output data y0* and y1* of the symmetrical subfilter h0* (n) of the filter factor and h1* (n), according to formula
Y0=(y0*+y1*)/2, y1=(y1*-y0*)/2 reverts to the output data y0 and y1 of subfilter h0 (n) and h1 (n).
A kind of generating means of preamble sequence, described device include：
Frequency domain ZC sequence generation unit, for generating frequency domain ZC sequence；
Time domain sequences generation unit, the inverse discrete Fourier transform for the frequency domain ZC sequence to be carried out to small point, obtains
To time domain sequences；
Interpolation multiple determination unit is up-sampled, is used to be counted according to the time-domain sampling of target preamble sequence and described
Small point determines up-sampling interpolation multiple；
The combination determination unit of graded filter, for from default graded filter group determine with the system bandwidth with
And the combination of the corresponding graded filter of the up-sampling interpolation multiple, the graded filter group include first filter,
Second filter and third filter, the first filter and the second filter stopband value are set as Fstop=Fs/
3-Fpass, the third filter stop bend value are set as Fstop=Fs/2-Fpass, and Fs, which is that the system bandwidth is corresponding, to be adopted
Sample rate, Fpass are the half of the target preamble sequence occupied bandwidth (1.08MHz)；
Interpolation process unit obtains the time domain sequences into row interpolation for the combination using the graded filter
Time domain sequences after length transition；
Phase transition unit obtains phase transition for the time domain sequences after the length transition to be carried out phase transition
Time domain sequences afterwards；
Subsequent processing units are used for the format according to the target preamble sequence to the time domain after the phase transition
Sequence carries out corresponding subsequent processing；
Add cyclic prefix unit, for adding the time domain sequences after cyclic prefix to the subsequent processing, obtains target
Preamble sequences.
Preferably, described device further includes：
The time-domain sampling points determination unit of target preamble sequence, for according to the target preamble sequence
Format and system bandwidth determine the time-domain sampling points of the target preamble sequence；
Small point determination unit determines direct computation of DFT for counting according to the time-domain sampling of the target preamble sequence
The small point of leaf inverse transformation.
Preferably, the phase transition unit is specifically used for：
Phase rotation angle is obtained according to the initial position of preset frequency domain resource；
Time domain sequences after the length transition are multiplied with the phase rotation angle, phase transition is carried out, obtains phase
The transformed time domain sequences in position.
Preferably, in the first filter, Fs=7.68MHz, Fpass=0.54MHz, in the second filter,
Fs=3.84MHz, Fpass=0.54MHz, in the third filter, Fs=15.36MHz, Fpass=0.54MHz.
Preferably, described device further includes：
Whether judging unit includes the first filter and/or institute in the combination for judging the graded filter
Second filter is stated, obtains the first judging result；
Filter factor acquiring unit, for when first judging result be comprising when, obtain the first filter and/
Or the filter factor of the second filter；
Division unit, for the filter factor to be divided into three groups, one subfilter of every group of correspondence；
The symmetrical subfilter generation unit of filter factor, for determining, filter factor is asymmetric in three subfilters
Two subfilter h0 (n) and h1 (n)；According to formula h 0* (n)=h0 (n)-h1 (n), h1* (n)=h0 (n)+h1 (n) by institute
It states h0 (n) and h1 (n) is transformed to the symmetrical subfilter h0* (n) of filter factor and h1* (n)；
Data recovery unit is used for the output data of the filter factor symmetrical subfilter h0* (n) and h1* (n)
Y0* and y1* reverts to subfilter h0's (n) and h1 (n) according to formula y0=(y0*+y1*)/2, y1=(y1*-y0*)/2
Output data y0 and y1.
It can be seen via above technical scheme that compared with prior art, the invention discloses a kind of preamble sequences
The generation method and device of row, preset graded filter group, and the graded filter group includes first filter, the second filtering
Device and third filter, the first filter and the second filter stopband value are set as Fstop=Fs/3-Fpass,
The third filter stop bend value is set as Fstop=Fs/2-Fpass, and Fs is the corresponding sample rate of the system bandwidth,
Fpass is the half of the target preamble sequence occupied bandwidth (1.08MHz), first filter, second filter and the
The coefficient of three filters is respectively less than Direct-type FIR low pass filter, reduces computing cost, and be directed to different system bandwidths
With Preamble format, it is only necessary to design 3 kinds of filters, reduce development cost.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the time domain constituted mode schematic diagram of preamble sequences disclosed by the invention；
Fig. 2 is a kind of generation device structure schematic diagram of existing preamble sequences disclosed in background of invention；
Fig. 3 is a kind of flow diagram of the generation method of preamble sequence disclosed by the embodiments of the present invention；
Fig. 4 is a kind of structural schematic diagram of the generating means of preamble sequence disclosed by the embodiments of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Term " first ", " second " in description and claims of this specification and above-mentioned attached drawing etc. are for distinguishing
Similar object, without being used to describe specific sequence or precedence.It should be appreciated that the term used in this way is in appropriate feelings
It can be interchanged under condition, this is only the object used differentiation in description described in the embodiment of the present invention to same alike result
Mode.In addition, term " comprising " and " having " and their any deformation, it is intended that cover it is non-exclusive include, so as to
Including a series of process of units, method, system, product or equipment are not necessarily limited to those units, but may include unclear
Other units that ground is listed or for these processes, method, product or equipment inherently.
By background technology it is found that interpolating unit can be by up-sampling interpolating unit and Direct-type FIR low passes in the prior art
The combination of filter realizes, still, for the IFFT that counts greatly, if using traditional Direct-type FIR Filter low-pass filtering,
Then coefficient is very long, and computing cost is big, and, for different Preamble format (format) and BW (system bandwidth)
Combination, the interpolating unit are needed through the combination of different up-sampling interpolating unit and Direct-type FIR low pass filter come real
It is existing.In the prior art, to the various combination of all Preamble format and BW, individually designed Direct-type FIR low-pass filtering is needed
Device.In this way, needing up to 6 kinds of the Direct-type FIR low pass filter designed in total, development cost is increased.
For this purpose, the invention discloses a kind of generation method of preamble sequence and device, graded filter is preset
Group, the graded filter group include first filter, second filter and third filter, the first filter and
The second filter stopband value is set as Fstop=Fs/3-Fpass, and the third filter stop bend value is set as Fstop=
Fs/2-Fpass, Fs are the corresponding sample rate of the system bandwidth, and Fpass is the target preamble sequence occupied bandwidth
The coefficient of the half of (1.08MHz), first filter, second filter and third filter is respectively less than Direct-type FIR low pass filtereds
Wave device reduces computing cost, and is directed to different system bandwidths and Preamble format, it is only necessary to design 3 kinds of filtering
Device reduces development cost.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Attached drawing 3 is please referred to, is a kind of flow of the generation method of preamble sequence disclosed by the embodiments of the present invention
Schematic diagram, this method specifically comprise the following steps：
S101 generates frequency domain ZC sequence.
Specifically, in the present embodiment, frequency domain ZC sequence can be generated in accordance with the following steps：
Time domain ZC sequences are generated according to formula；
Calculate the time domain ZC sequences and；
Time domain samples value is selected from the ZC sequences according to default frequency domain index value；
The selected time domain samples value is subjected to conjugate operation；
Obtain the time domain ZC sequences and the multiplied result with the time domain samples value after the conjugate operation；
Phase rotation angle is generated according to pre-set cyclic shift amount；
It is revolved by the time domain ZC sequences and with the multiplied result of the time domain samples value after the conjugate operation and the phase
Gyration is multiplied, and obtains frequency domain ZC sequence.
The frequency domain ZC sequence is carried out the inverse discrete Fourier transform of small point, obtains time domain sequences by S102.
Before this step, the method further includes：
The target preamble sequence is determined according to the format of the target preamble sequence and system bandwidth
Time-domain sampling is counted；It is counted according to the time-domain sampling of the target preamble sequence and determines the dot of inverse discrete Fourier transform
Number.When the time-domain sampling of target preamble sequence points are 1024, the small point of the inverse discrete Fourier transform
It is 1024, when the time-domain sampling of target preamble sequence points is more than or equal to 2048, the discrete fourier
The small point of inverse transformation is 2048.
For example, with shown in table 3, the format of the target preamble sequence is 0, system bandwidth 20MHz, then, described
The time-domain sampling points of target preamble sequence are 24576,
S103 determines up-sampling interpolation times according to the time-domain sampling of target preamble sequence points and the small point
Number.
For example, the time-domain sampling points of target preamble sequence are 24576, then the small point is 2048, then described
It is 24576 divided by 2048, as 12 to up-sample interpolation multiple.
S104, determination is corresponding with the system bandwidth and the up-sampling interpolation multiple from default graded filter group
Graded filter combination.
The graded filter group includes first filter, second filter and third filter, first filtering
Device and the second filter stopband value are set as Fstop=Fs/3-Fpass, and the third filter stop bend value is set as
Fstop=Fs/2-Fpass, Fs are the corresponding sample rate of the system bandwidth, and Fpass is that the target preamble sequence accounts for
With the half of bandwidth (1.08MHz).In the first filter, Fs=7.68MHz, Fpass=0.54MHz, second filter
In wave device, Fs=3.84MHz, Fpass=0.54MHz, in the third filter, Fs=15.36MHz, Fpass=
0.54MHz。
It is specific such as 5 institute of table from the combination of different system bandwidth and the corresponding graded filter of different up-sampling interpolation multiples
Show.
Table 5
S105, using the combination of the graded filter to the time domain sequences into row interpolation, after obtaining length transition
Time domain sequences.
Time domain sequences after the length transition are carried out phase transition, obtain the time domain sequences after phase transition by S106.
In the present embodiment, which specifically includes：
Phase rotation angle is obtained according to the initial position of preset frequency domain resource；
Time domain sequences after the length transition are multiplied with the phase rotation angle, phase transition is carried out, obtains phase
The transformed time domain sequences in position.
S107 carries out the time domain sequences after the phase transition according to the format of the target preamble sequence corresponding
Subsequent processing.
S108 adds the time domain sequences after cyclic prefix to the subsequent processing, obtains target preamble sequence.
Present embodiment discloses a kind of generation method of preamble sequence, default graded filter group, described point
Section filter group includes first filter, second filter and third filter, the first filter and described second
Filter stop bend value is set as Fstop=Fs/3-Fpass, and the third filter stop bend value is set as Fstop=Fs/2-
Fpass, Fs are the corresponding sample rate of the system bandwidth, and Fpass is the target preamble sequence occupied bandwidth
The coefficient of the half of (1.08MHz), first filter, second filter and third filter is respectively less than Direct-type FIR low pass filtereds
Wave device reduces computing cost, and is directed to different system bandwidths and Preamble format, it is only necessary to design 3 kinds of filtering
Device reduces development cost.
In addition, when in the combination of the graded filter including the first filter and/or the second filter,
The first filter or the second filter can be equivalent to multiphase filter, the sub- filter factor pair of multiphase filter
Claim, the calculation amount of filtering can be further reduced.Specifically, obtaining the filtering of the first filter or the second filter
The filter factor is divided into three groups, one subfilter of every group of correspondence by coefficient；
Determine the asymmetric two subfilter h0 (n) of filter factor and h1 (n) in three subfilters；
The h0 (n) and h1 (n) are converted according to formula h 0* (n)=h0 (n)-h1 (n), h1* (n)=h0 (n)+h1 (n)
For the symmetrical subfilter h0* (n) of filter factor and h1* (n)；
By the output data y0* and y1* of the symmetrical subfilter h0* (n) of the filter factor and h1* (n), according to formula
Y0=(y0*+y1*)/2, y1=(y1*-y0*)/2 reverts to the output data y0 and y1 of subfilter h0 (n) and h1 (n).
It is assumed that the filter factor of first filter is【3239 0 -56 -67 0 96 116 0 -177 -228 0 476
961 1166 961 476 0 -228 -177 0 116 96 0 -67 -56 0 39 32】, then it is divided into three groups, every group of correspondence
One subfilter, it is specific as follows：
H0 (n)=【32 -56 96 -177 476 961 -228 116 -67 39】、
H1 (n)=【39 -67 116 -228 961 476 -177 96 -56 32】、
H2 (n)=【0 0 0 0 1166 0 0 0 0 0】.
Filter factor is asymmetric in subfilter h0 (n) and h1 (n), then according to formula h 0* (n)=h0 (n)-h1 (n),
The h0 (n) and h1 (n) are transformed to the symmetrical subfilter h0* (n) of filter factor and h1* by h1* (n)=h0 (n)+h1 (n)
(n) it is specially：
H0* (n)=【-7 11 -20 51 -485 485 -51 20 -11 7】
H1* (n)=【71 -123 212 -405 1437 1437 -405 212 -123 71】
Later, by the output data y0* and y1* of the symmetrical subfilter h0* (n) of the filter factor and h1* (n), root
According to formula y0=(y0*+y1*)/2, y1=(y1*-y0*)/2 revert to subfilter h0 (n) and h1 (n) output data y0 and
y1。
By above-mentioned processing, three groups of sub- filter factors can be made symmetrical, computing cost can be further reduced.
Method is described in detail in aforementioned present invention disclosed embodiment, diversified forms can be used for the method for the present invention
Device realize, therefore the invention also discloses a kind of generating means of preamble sequence, specific reality is given below
Example is applied to be described in detail.
Attached drawing 4 is please referred to, is a kind of structure of the generating means of preamble sequence disclosed by the embodiments of the present invention
Schematic diagram, the device are specifically included such as lower unit：
Frequency domain ZC sequence generation unit 11, for generating frequency domain ZC sequence；
Time domain sequences generation unit 12, the inverse discrete Fourier transform for the frequency domain ZC sequence to be carried out to small point,
Obtain time domain sequences；
Interpolation multiple determination unit 13 is up-sampled, for according to the time-domain sampling of target preamble sequence points and institute
It states small point and determines up-sampling interpolation multiple；
The combination determination unit 14 of graded filter, for being determined and the system bandwidth from default graded filter group
And the combination for up-sampling the corresponding graded filter of interpolation multiple, the graded filter group include the first filtering
Device, second filter and third filter, the first filter and the second filter stopband value are set as Fstop=
Fs/3-Fpass, the third filter stop bend value are set as Fstop=Fs/2-Fpass, and Fs is that the system bandwidth is corresponding
Sample rate, Fpass are the half of the target preamble sequence occupied bandwidth；
Interpolation process unit 15 obtains the time domain sequences into row interpolation for the combination using the graded filter
Time domain sequences after to length transition；
Phase transition unit 16 obtains phase and turns for the time domain sequences after the length transition to be carried out phase transition
Time domain sequences after changing；
Subsequent processing units 17, for according to the format of the target preamble sequence to after the phase transition when
Domain sequence carries out corresponding subsequent processing；
Add cyclic prefix unit 18, for adding the time domain sequences after cyclic prefix to the subsequent processing, obtains target
Preamble sequences.
Preferably, described device further includes：
The time-domain sampling points determination unit of target preamble sequence, for according to the target preamble sequence
Format and system bandwidth determine the time-domain sampling points of the target preamble sequence；
Small point determination unit determines direct computation of DFT for counting according to the time-domain sampling of the target preamble sequence
The small point of leaf inverse transformation.
Preferably, the phase transition unit is specifically used for：
Phase rotation angle is obtained according to the initial position of preset frequency domain resource；
Time domain sequences after the length transition are multiplied with the phase rotation angle, phase transition is carried out, obtains phase
The transformed time domain sequences in position.
Preferably, in the first filter, Fs=7.68MHz, Fpass=0.54MHz, in the second filter,
Fs=3.84MHz, Fpass=0.54MHz, in the third filter, Fs=15.36MHz, Fpass=0.54MHz.
Preferably, described device further includes：
Whether judging unit includes the first filter and/or institute in the combination for judging the graded filter
Second filter is stated, obtains the first judging result；
Filter factor acquiring unit, for when first judging result be comprising when, obtain the first filter and/
Or the filter factor of the second filter；
Division unit, for the filter factor to be divided into three groups, one subfilter of every group of correspondence；
The symmetrical subfilter generation unit of filter factor, for determining, filter factor is asymmetric in three subfilters
Two subfilter h0 (n) and h1 (n)；According to formula h 0* (n)=h0 (n)-h1 (n), h1* (n)=h0 (n)+h1 (n) by institute
It states h0 (n) and h1 (n) is transformed to the symmetrical subfilter h0* (n) of filter factor and h1* (n)；
Data recovery unit is used for the output data of the filter factor symmetrical subfilter h0* (n) and h1* (n)
Y0* and y1* reverts to subfilter h0's (n) and h1 (n) according to formula y0=(y0*+y1*)/2, y1=(y1*-y0*)/2
Output data y0 and y1.
It should be noted that the concrete function of above-mentioned each unit is realized described in embodiment of the method, the present embodiment
It repeats no more.
In summary：
The invention discloses a kind of generation method of preamble sequence and devices, preset graded filter group, institute
It includes first filter, second filter and third filter to state graded filter group, the first filter and described
Second filter stopband value is set as Fstop=Fs/3-Fpass, and the third filter stop bend value is set as Fstop=Fs/
2-Fpass, Fs are the corresponding sample rate of the system bandwidth, and Fpass is the one of the target preamble sequence occupied bandwidth
Half, the coefficient of first filter, second filter and third filter is respectively less than Direct-type FIR low pass filter, reduces meter
Calculate expense, and be directed to different system bandwidths and Preamble format, it is only necessary to design 3 kinds of filters, reduce exploitation at
This.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
In addition it should be noted that, the apparatus embodiments described above are merely exemplary, wherein described as separation
The unit of part description may or may not be physically separated, the component shown as unit can be or
It can not be physical unit, you can be located at a place, or may be distributed over multiple network units.It can be according to reality
Border needs to select some or all of module therein to achieve the purpose of the solution of this embodiment.In addition, provided by the invention
In device embodiment attached drawing, the connection relation between module indicates there is communication connection between them, specifically can be implemented as one
Item or a plurality of communication bus or signal wire.Those of ordinary skill in the art are without creative efforts, you can with
Understand and implements.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can borrow
Help software that the mode of required common hardware is added to realize, naturally it is also possible to by specialized hardware include application-specific integrated circuit, specially
It is realized with CPU, private memory, special components and parts etc..Under normal circumstances, all functions of being completed by computer program can
It is easily realized with corresponding hardware, moreover, for realizing that the particular hardware structure of same function can also be a variety of more
Sample, such as analog circuit, digital circuit or special circuit etc..But it is more for the purpose of the present invention in the case of software program it is real
It is now more preferably embodiment.Based on this understanding, technical scheme of the present invention substantially in other words makes the prior art
The part of contribution can be expressed in the form of software products, which is stored in the storage medium that can be read
In, such as the floppy disk of computer, USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory
Device (RAM, Random Access Memory), magnetic disc or CD etc., including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes the method described in each embodiment of the present invention.
In conclusion the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to upper
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to upper
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of generation method of preamble sequence, which is characterized in that the method includes：
Generate frequency domain ZC sequence；
The inverse discrete Fourier transform that the frequency domain ZC sequence is carried out to small point, obtains time domain sequences；
Up-sampling interpolation multiple is determined according to the time-domain sampling of target preamble sequence points and the small point；
Graded filter corresponding with system bandwidth and the up-sampling interpolation multiple is determined from default graded filter group
Combination, the graded filter group includes first filter, second filter and third filter, the first filter
And the second filter stopband value is set as Fstop=Fs/3-Fpass, the third filter stop bend value is set as
Fstop=Fs/2-Fpass, Fs are the corresponding sample rate of the system bandwidth, and Fpass is that the target preamble sequence accounts for
With the half of bandwidth；Fs=7.68MHz in the first filter, Fs=3.84MHz in the second filter, the third
Fs=15.36MHz in filter；
Time domain sequences after length transition are obtained into row interpolation to the time domain sequences using the combination of the graded filter；
Time domain sequences after the length transition are subjected to phase transition, obtain the time domain sequences after phase transition；
Corresponding follow-up place is carried out to the time domain sequences after the phase transition according to the format of the target preamble sequence
Reason；
The time domain sequences after cyclic prefix to the subsequent processing are added, target preamble sequence is obtained.
2. according to the method described in claim 1, it is characterized in that, it is described by the frequency domain ZC sequence carry out small point from
Inverse Fourier transform is dissipated, before obtaining time domain sequences, the method further includes：
The time domain of the target preamble sequence is determined according to the format of the target preamble sequence and system bandwidth
Sampling number；
It is counted according to the time-domain sampling of the target preamble sequence and determines the small point of inverse discrete Fourier transform.
3. according to the method described in claim 1, it is characterized in that, the time domain sequences by after the length transition carry out phase
Position conversion, obtains the time domain sequences after phase transition, specifically includes：
Phase rotation angle is obtained according to the initial position of preset frequency domain resource；
Time domain sequences after the length transition are multiplied with the phase rotation angle, carry out phase transition, phase is obtained and turns
Time domain sequences after changing.
4. according to the method described in claim 1, it is characterized in that, in the first filter, Fs=7.68MHz, Fpass=
0.54MHz, in the second filter, Fs=3.84MHz, Fpass=0.54MHz, in the third filter, Fs=
15.36MHz Fpass=0.54MHz.
5. the method according to any one of Claims 1 to 4, which is characterized in that use the region filtering described
Before the combination of device obtains the time domain sequences after length transition to the time domain sequences into row interpolation, the method further includes：
Judge in the combination of the graded filter whether to include the first filter and/or the second filter, obtain
First judging result；
When first judging result be comprising when, obtain the filtering system of the first filter and/or the second filter
Number；
The filter factor is divided into three groups, one subfilter of every group of correspondence；
Determine the asymmetric two subfilter h0 (n) of filter factor and h1 (n) in three subfilters；
The h0 (n) and h1 (n) are transformed to filter according to formula h 0* (n)=h0 (n)-h1 (n), h1* (n)=h0 (n)+h1 (n)
The symmetrical subfilter h0* (n) of wave system number and h1* (n)；
By the output data y0* and y1* of the symmetrical subfilter h0* (n) of the filter factor and h1* (n), according to formula y0=
(y0*+y1*)/2, y1=(y1*-y0*)/2 reverts to the output data y0 and y1 of subfilter h0 (n) and h1 (n).
6. a kind of generating means of preamble sequence, which is characterized in that described device includes：
Frequency domain ZC sequence generation unit, for generating frequency domain ZC sequence；
Time domain sequences generation unit, the inverse discrete Fourier transform for the frequency domain ZC sequence to be carried out to small point, when obtaining
Domain sequence；
Interpolation multiple determination unit is up-sampled, for according to the time-domain sampling of target preamble sequence points and the dot
Number determines up-sampling interpolation multiple；
The combination determination unit of graded filter, for being determined and system bandwidth and described from default graded filter group
The combination of the corresponding graded filter of sample interpolation multiple, the graded filter group include first filter, the second filtering
Device and third filter, the first filter and the second filter stopband value are set as Fstop=Fs/3-Fpass,
The third filter stop bend value is set as Fstop=Fs/2-Fpass, and Fs is the corresponding sample rate of the system bandwidth,
Fpass is the half of the target preamble sequence occupied bandwidth；Fs=7.68MHz in the first filter, described
Fs=3.84MHz in two filters, Fs=15.36MHz in the third filter；
Interpolation process unit obtains length to the time domain sequences for the combination using the graded filter into row interpolation
Transformed time domain sequences；
Phase transition unit, for the time domain sequences after the length transition to be carried out phase transition, after obtaining phase transition
Time domain sequences；
Subsequent processing units are used for the format according to the target preamble sequence to the time domain sequences after the phase transition
Carry out corresponding subsequent processing；
Add cyclic prefix unit, for adding the time domain sequences after cyclic prefix to the subsequent processing, obtains target
Preamble sequences.
7. device according to claim 6, which is characterized in that described device further includes：
The time-domain sampling points determination unit of target preamble sequence, for the format according to the target preamble sequence
And system bandwidth determines the time-domain sampling points of the target preamble sequence；
Small point determination unit determines that discrete fourier is inverse for counting according to the time-domain sampling of the target preamble sequence
The small point of transformation.
8. device according to claim 6, which is characterized in that the phase transition unit is specifically used for：
Phase rotation angle is obtained according to the initial position of preset frequency domain resource；
Time domain sequences after the length transition are multiplied with the phase rotation angle, carry out phase transition, phase is obtained and turns
Time domain sequences after changing.
9. device according to claim 6, which is characterized in that in the first filter, Fs=7.68MHz, Fpass=
0.54MHz, in the second filter, Fs=3.84MHz, Fpass=0.54MHz, in the third filter, Fs=
15.36MHz Fpass=0.54MHz.
10. the device according to any one of claim 6~9, which is characterized in that described device further includes：
Whether judging unit includes the first filter and/or described the in the combination for judging the graded filter
Two filters obtain the first judging result；
Filter factor acquiring unit, for when first judging result be comprising when, obtain the first filter and/or institute
State the filter factor of second filter；
Division unit, for the filter factor to be divided into three groups, one subfilter of every group of correspondence；
The symmetrical subfilter generation unit of filter factor, for determining asymmetric two of filter factor in three subfilters
Subfilter h0 (n) and h1 (n)；According to formula h 0* (n)=h0 (n)-h1 (n), h1* (n)=h0 (n)+h1 (n) by the h0
(n) and h1 (n) is transformed to the symmetrical subfilter h0* (n) of filter factor and h1* (n)；
Data recovery unit is used for the output data y0* of the symmetrical subfilter h0* (n) of the filter factor and h1* (n)
And y1*, the output of subfilter h0 (n) and h1 (n) are reverted to according to formula y0=(y0*+y1*)/2, y1=(y1*-y0*)/2
Data y0 and y1.
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|---|---|---|---|---|
| CN101860395A (en) * | 2010-05-31 | 2010-10-13 | 合肥东芯通信股份有限公司 | Method and equipment for generating preamble sequence |
| CN101958855A (en) * | 2009-07-13 | 2011-01-26 | 联芯科技有限公司 | Method, device and system for generating PRACH baseband signal |
| CN102065563A (en) * | 2010-05-31 | 2011-05-18 | 合肥东芯通信股份有限公司 | Method and equipment for generating frequency-domain Zadoff-Chu sequences |
| JP5441257B2 (en) * | 2006-06-19 | 2014-03-12 | テキサス インスツルメンツ インコーポレイテッド | Random access structure for wireless networks |
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| US7792212B2 (en) * | 2007-01-05 | 2010-09-07 | Lg Electronics, Inc. | Method for setting cyclic shift considering frequency offset |
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|---|---|---|---|---|
| JP5441257B2 (en) * | 2006-06-19 | 2014-03-12 | テキサス インスツルメンツ インコーポレイテッド | Random access structure for wireless networks |
| CN101958855A (en) * | 2009-07-13 | 2011-01-26 | 联芯科技有限公司 | Method, device and system for generating PRACH baseband signal |
| CN101860395A (en) * | 2010-05-31 | 2010-10-13 | 合肥东芯通信股份有限公司 | Method and equipment for generating preamble sequence |
| CN102065563A (en) * | 2010-05-31 | 2011-05-18 | 合肥东芯通信股份有限公司 | Method and equipment for generating frequency-domain Zadoff-Chu sequences |
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