CN101860395B - Method and equipment for generating preamble sequence - Google Patents
Method and equipment for generating preamble sequence Download PDFInfo
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- CN101860395B CN101860395B CN2010101881041A CN201010188104A CN101860395B CN 101860395 B CN101860395 B CN 101860395B CN 2010101881041 A CN2010101881041 A CN 2010101881041A CN 201010188104 A CN201010188104 A CN 201010188104A CN 101860395 B CN101860395 B CN 101860395B
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Abstract
The invention discloses a method and equipment for generating a preamble sequence. The method comprises the following steps of: generating a frequency domain ZC sequence; determining a format and a time domain sampling point number of a target preamble sequence; performing inverse discrete Fourier transform of a corresponding preset small point number on the frequency domain ZC sequence according to the time domain sampling point number of the target preamble sequence to obtain a time domain sequence; performing interpolation on the time domain sequence, and converting the length of the time domain sequence into a length corresponding to the time domain sampling point number of the target preamble sequence; acquiring a phase rotation angle according to an initial position of the preset frequency domain resource; multiplying the time domain sequence with the converted length and the phase rotation angle, and performing phase conversion; performing corresponding subsequent processing on the time domain sequence with the converted phase according to the format of the target preamble sequence; and adding a cyclic prefix to the subsequent processed time domain sequence. The preamble sequence generating method disclosed by the embodiment of the invention avoids the occurrence of Fourier transform of a large point number so as to improve the operation speed, reduce the calculation quantity, improve the generating speed and reduce the power consumption and the circuit area at the same time.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of generation method and apparatus of preamble sequence.
Background technology
LTE (Long Term Evolution; Long Term Evolution) system is thought accurate 4G wireless communication system widely; It has the transmission rate of the up 50M of descending 100M; Support higher translational speed (350km/h) and bigger coverage radius of cell (100 kilometers) simultaneously, support that 200 users in every sub-district are simultaneously online.In addition, LTE also has band width configuration (1.4M～20M), support multi-media broadcasting service and end-to-end QoS characteristics such as (Quality of Service, service quality) flexibly.Therefore LTE also is considered to the following candidate's standard that moves aroused in interest developing direction and 4G technology.
Before normal subscriber data traffic, UE (User Experience, user experience) at first will carry out random access procedure, so that be used for adjusting up (Uplink) transmitting time, distributes Radio Network Temporary Identifier (RNTI), at random access interference solution etc.In the up link of LTE, RACH PRACH is used for initiating user's the request of access at random, and the wherein general signaling procedure that inserts at random is as shown in Figure 1.Random access procedure was divided into for four steps, and the first step is that UE sends random access guiding preamble sequence, and second one is that eNodeB sends accidental access response, wherein contains the line time adjustment information, and then UE adjusts up transmitting time according to this adjustment information.The 3rd step and the 4th step are Radio Resource control (Radio Resource Control) protocol signalings.Wherein the first step comprises the generative process of the generative process frequency domain ZC sequence of the Preamble sequence that the present invention relates to.UE will generate according to upper strata sequence of indication selection and according to certain step in 64 predefined Preamble sequences.
Being created in the whole random access procedure of Preamble is in consequence, and Preamble is by the Zadoff-Chu sequence promptly, the ZC sequence, and through cyclic shift, time-frequency conversion, the physical resource mapping generates.It is formula 1 that the time domain of ZC sequence generates formula:
N wherein
ZCBe sequence length, as shown in Figure 1, be divided into four kinds of forms.U is the generation root of ZC sequence, and for form 0～3, its value is 0～837, and is 0～137 for its value of format 4.
The time domain of a Preamble sequence constitutes as shown in Figure 2, and wherein 21 is CP (Cyclic Prefix, Cyclic Prefix), and 22 is the time domain sequences of Preamble, T
CPBe the length of Cyclic Prefix, T
SEQLength for time domain sequences.Preamble is divided into four kinds of forms according to the length difference, and is as shown in Figure 3, wherein T
sBe LTE system time sampling sampling point interval, length is T
s=1/ (15000 * 2048) second.
The generative process of the Preamble sequence of stipulating among the agreement 3GPP TS36.211 is shown in formula 2:
X wherein
U, v(n) be the ZC sequence of time domain, u is a root, and v is a cyclic shift amount index, and actual cyclic shift number of samples is C
v0≤t＜T
SEQ+ T
CP,
Be the number of Resource Block of LTE (Resource Block) sub-carriers,
Be the number of eNodeB for the ascending resource piece of this user's distribution,
Be the original position of eNodeB for the Preamble sequence frequency domain resource of this user's distribution, this position is unit with the Resource Block.β
PRACHBe the power control adjustment factor.K=Δ f/ Δ f
RA, wherein Δ f is data subcarrier (meta 15kHz of LTE system or 7.5kHz) at interval, Δ f
RABe Preamble sequence subcarrier in frequency domain interval.
is a fixing frequency domain side-play amount.Δ f
RAWith
Value as shown in Figure 4.
The Preamble generative process of stipulating in the LTE agreement can be decomposed into the realization unit in implementation procedure; Its structure is as shown in Figure 5; Time domain sequences generation unit 51 generates the ZC sequence of time domain according to formula 1; Cycle shift unit 52 is carried out cyclic shift according to the side-play amount of a cyclic shift of indication selection on eNodeB and UE upper strata to the ZC sequence of time domain, and its process can be represented by formula 3:
x
u，v(n)＝x
u((n+C
v)modN
ZC) (3)
Wherein, C
vBe by the cyclic shift amount that calculates.Accomplish the time domain generative process of ZC sequence this moment, and the length of this time domain sequences is 839 or 139, and is as shown in Figure 1.Carry out discrete Fourier transform through DFT unit 53 then, generate frequency domain ZC sequence, counting of this DFT operation is identical with the length of time domain ZC sequence, is 839 or 139.Frequency domain map unit 54 is accomplished the mapping of frequency domain resource.The shared bandwidth of Preamble sequence is 1.08M, and wherein the shared bandwidth of frequency domain sequence is 1.048M, and all the other are the protection interval.For fear of access interference, eNodeB is used for transmitting the Preamble sequence of this 1.08M for the user has distributed different frequency domain positions.Therefore UE needs this frequency domain sequence is moved on the frequency band of eNodeB appointment, and the original position of this frequency band is the k in the formula 2
0, frequency band length is 1.08M, frequency domain ZC sequence then is placed on the space of middle 1.048M of above allocated frequency band.IFFT unit 55 is transformed into time domain with the ZC of frequency domain.Counting of this IFFT operation counted for the corresponding time-domain sampling of this Preamble sequence, the time-domain sampling that Fig. 6 and Fig. 7 are respectively the Preamble sequence correspondence of format 0 and format 4 sketch map of counting.For Preamble format 1, format 2, and format 3, need through repetitive 56, and format 0 is carried out the repetition of corresponding number of times and obtains, and through adding CP unit 58, accomplish the generation of the Preamble sequence of time domain then.
Can see by Fig. 6 and Fig. 7; Counting of the maximum of IFFT reaches 24576 in the IFFT unit 55, and during the IFFT on ordinary meaning realizes, its operand will be huge and be difficult to realize; Further, huge operand will inevitably cause the increase of high power consumption and circuit area.
Summary of the invention
In view of this, the present invention provides a kind of generation method and apparatus of preamble sequence, with solve in the prior art amount of calculation big, be difficult to problem such as realization.Its scheme is specially:
A kind of generation method of preamble sequence comprises:
Generate frequency domain ZC sequence, said frequency domain ZC sequence is represented frequency domain Zadoff-Chu sequence;
Confirm the form and the time domain sampling number of target preamble sequence;
Count according to the time-domain sampling of said target preamble sequence said frequency domain ZC sequence is carried out accordingly preset small point inverse discrete Fourier transform, obtain time domain sequences;
Time domain sequences is carried out interpolation, its length transition is returned and the said target preamble sequence time-domain sampling corresponding length of counting;
Original position according to preset frequency domain resource obtains phase rotation angle;
Time domain sequences after the length transition and said phase rotation angle are multiplied each other, carry out phase transition;
Carry out corresponding subsequent processing according to the form of the said target preamble sequence time domain sequences after to said phase transition;
Add the time domain sequences after Cyclic Prefix arrives said subsequent treatment, obtain target preamble sequence.
Preferably, when the time-domain sampling of said target preamble sequence is counted when being 1024, it is 1024 inverse discrete Fourier transform that said ZC sequence is carried out sampling number.
Preferably, when the time-domain sampling of said target preamble sequence is counted more than or equal to 2048 the time, it is 2048 inverse discrete Fourier transform that said ZC sequence is carried out sampling number.
Preferably, when the form of said target preamble sequence was format 0 or format 4, said subsequent treatment was do-nothing operation.
Preferably, when the form of said target preamble sequence was format 1, format2 or format 3, said subsequent treatment was for to carry out the repetitive operation of corresponding number of times to the time domain sequences after the said phase transition.
Preferably, generate frequency domain ZC sequence according to following process:
Generate time domain ZC sequence according to formula;
Calculate said time domain ZC sequence with;
From said ZC sequence, select the time domain sample value according to preset frequency domain index value;
The time domain sample value of said selection is carried out conjugate operation;
Obtain said time domain ZC sequence and with said conjugate operation after the multiplied result of time domain sample value;
Generate phase rotation angle according to the cyclic shift amount that is provided with in advance;
Multiply each other with said time domain ZC sequence with the multiplied result and the said phase rotation angle of time domain sample value behind the said conjugate operation, obtain frequency domain ZC sequence.
A kind of generation equipment of preamble sequence comprises:
The frequency domain ZC sequence generation unit is used to generate frequency domain ZC sequence, and said frequency domain ZC sequence is represented frequency domain Zadoff-Chu sequence;
Confirm the unit, be used for confirming the form and the time domain sampling number of target preamble sequence;
The inverse discrete Fourier transform unit is used for counting according to the time-domain sampling of said target preamble sequence said frequency domain ZC sequence is carried out accordingly preset small point inverse discrete Fourier transform, obtains time domain sequences;
Interpolating unit is carried out interpolation to time domain sequences, and its length transition is returned and the said target preamble sequence time-domain sampling corresponding length of counting;
The angle generation unit is used for obtaining phase rotation angle according to the original position of preset frequency domain resource;
First unit that multiplies each other is used for time domain sequences after the length transition and said phase rotation angle are multiplied each other, and carries out phase transition;
The subsequent treatment unit is used for form according to the said target preamble sequence time domain sequences after to said phase transition and carries out corresponding subsequent processing;
Add cyclic prefix unit, be used to add the time domain sequences after Cyclic Prefix arrives said subsequent treatment, obtain target preamble sequence.
Preferably, said frequency domain ZC sequence generation unit comprises:
Time domain ZC sequence generating unit is used for generating time domain ZC sequence according to formula;
Sum unit, be used to calculate said time domain ZC sequence with;
The sampling point selected cell is used for selecting the time domain sample value according to preset frequency domain index value from said ZC sequence;
Conjugate unit is used for the time domain sample value of said selection is carried out conjugate operation;
First unit that multiplies each other, be used to obtain said time domain ZC sequence and with said conjugate operation after the multiplied result of time domain sample value;
The angle generation unit is used for generating phase rotation angle according to the cyclic shift amount that is provided with in advance;
Second unit that multiplies each other is used for said first the multiply each other result of unit and the result of said angle generation unit multiplied each other, and obtains frequency domain ZC sequence.
Preferably, said interpolating unit comprises: three times of up-sampling unit that order links to each other, first low pass filter, the first twice up-sampling unit, second low pass filter unit, the second twice up-sampling unit, the 3rd low pass filter unit.
Can find out that from above-mentioned technical scheme the generation method of the disclosed preamble sequence of the embodiment of the invention has preestablished dissimilar small point IFFT conversion to the different time domain sampling number; Avoid the situation appearance of IFFT conversion of counting greatly, thereby improved arithmetic speed, then it has been carried out equivalent operation; The final generation is equivalent to the frequency domain resource mapping and the IFFT computing preamble sequence of counting greatly; And the dependence interpolation operation, according to different demands, adjust its accuracy.
Through said method, reduced the amount of calculation in the preamble sequence generative process, improved formation speed, reduced power consumption and circuit area simultaneously.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a ZC Format Series Lines sketch map;
Fig. 2 is that the time domain of Preamble sequence constitutes sketch map;
Fig. 3 is a Preamble Format Series Lines sketch map;
Fig. 4 is Δ f
RAWith
The value sketch map;
Fig. 5 generates the device structure sketch map for Preamble;
Fig. 6 is the corresponding time-domain sampling of the Preamble format 0 sequence sketch map of counting;
Fig. 7 is the corresponding time-domain sampling of the Preamble format 4 sequences sketch map of counting;
Fig. 8 is the generation method flow diagram of embodiment 1 disclosed preamble sequence;
Fig. 9 is the generation method flow diagram of embodiment 2 disclosed preamble sequences;
Figure 10 is that embodiment 3 disclosed frequency domain ZC sequence generate method flow diagram;
Figure 11 is that preamble sequence disclosed by the invention generates the device structure sketch map;
Figure 12 is the structural representation of frequency domain ZC sequence generation unit disclosed by the invention;
Figure 13 is the structural representation of interpolating unit disclosed by the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The invention discloses a kind of generation method of preamble sequence, avoided the calculating process of the IFFT that counts greatly, solved the problem that operand in the prior art is big and be difficult to realize.Its embodiment is described below:
Embodiment one
The flow process of the generation method of the disclosed preamble sequence of present embodiment is as shown in Figure 8, comprising:
Step S81, the said time domain ZC sequence of conversion are frequency domain ZC sequence;
According to formula 1, under the situation of given other parameters, obtain time domain ZC sequence in this step.The transfer process of present embodiment frequency domain ZC sequence is identical with prior art, at first time domain ZC sequence is carried out cyclic shift, then it is carried out the DFT conversion.
Step S82, the form of confirming target preamble sequence and time domain sampling number;
Can see by Fig. 1, the preamble sequence of the corresponding different-format of the length of different ZC sequences, and for the preamble sequence of different-format; When system bandwidth not simultaneously; Its time domain sampling number is also inequality, and promptly sequence length is also different, so subsequent operation also can be different.
Step S83, according to said target preamble sequence and the time domain sampling number said frequency domain ZC sequence is carried out accordingly preset inverse discrete Fourier transform IFFT, obtain time domain sequences;
Preestablished sampling number among the present invention and be 1024 or 2048 two types small point inverse discrete Fourier transform, counted, chosen different small point IFFT conversion according to the time-domain sampling of different preamble sequences.
Suppose to be input as F
u(k), k=0,1 ..., N
ZC-1, the both sides zero padding is to N
IfftPoint is output as H
u(i), i=0,1 ..., N
Ifft-1, wherein, for Preamble format 4, it is 1024 target preamble sequence that time-domain sampling is counted, N
Ifft=1024, and for other sampling numbers more than or equal to 2048 situation, N
Ifft=2048.
Step S84, time domain sequences is carried out interpolation, its length transition is returned and the said target preamble sequence time-domain sampling corresponding length of counting;
Change into 2048 owing in the preset small point IFFT conversion process time-domain sampling counted greater than the length of 2048 sequence; So need through interpolation, its length be changed back its original length at this; Change for different length, the process of interpolation is also different.
Through the time domain sequences U after the interpolation
u(t), t=0,1 ... L-1, L is for to count corresponding with the time-domain sampling of target preamble sequence.
Step S85, obtain phase rotation angle according to the original position of preset frequency domain resource;
According to
according to formula 4
Generate the angle of phase place rotation.In this step, the band bending amount of frequency domain is converted into the phase deviation of time domain.
Step S86, time domain sequences after the length transition and said phase rotation angle are multiplied each other, carry out phase transition;
Realize the offset of frequency domain through the phase transition of time domain.
Step S87, carry out corresponding subsequent processing according to the form of the said target preamble sequence time domain sequences after to said phase transition;
For different preamble Format Series Lineses, its post-treatment operations is different.
Step S88, interpolation Cyclic Prefix arrive the time domain sequences after the said subsequent treatment, obtain target preamble sequence.
Add cyclic prefix CP for time domain sequences, obtain target preamble sequence.
Can find out that by above-mentioned steps this method has preestablished dissimilar small point IFFT conversion to the different time domain sampling number; Avoid the situation appearance of IFFT conversion of counting greatly, thereby improved arithmetic speed, then it has been carried out equivalent operation; The final generation is equivalent to the frequency domain resource mapping and the IFFT computing preamble sequence of counting greatly; And the dependence interpolation operation, according to different demands, adjust its accuracy.
Through said method, reduced the amount of calculation in the preamble sequence generative process, improved formation speed, reduced power consumption and circuit area simultaneously.
Embodiment two
Can be found out that by the foregoing description according to different preamble Format Series Lineses and time domain sampling point parameter, its concrete generative process is different, present embodiment will further be explained to above-mentioned difference.Its flow process is as shown in Figure 9, comprising:
Step S91, generation frequency domain ZC sequence;
Step S92, the form of confirming target preamble sequence and time domain sampling number;
According to the preliminary election requirement, definite form and time domain sampling number that needs the preamble sequence of generation.
Step S93, judge that the time-domain sampling of said target preamble sequence counts, execution in step S941 when being 1024, when more than or equal to 2048 the time, execution in step S942;
Step S941, said ZC sequence is carried out sampling number is 1024 inverse discrete Fourier transform, obtains time domain sequences;
Counting for the time-domain sampling of target preamble sequence equals 1024 situation, owing to have and its corresponding sampling points number in the IFFT unit, then it is carried out conversion according to the corresponding sampling points number.
Step S942, said ZC sequence is carried out sampling number is 2048 inverse discrete Fourier transform, obtains time domain sequences;
Count when equaling 2048 when the time-domain sampling of target preamble sequence, it carried out the IFFT conversion according to 2048 sampled points, and but its greater than 2048 o'clock, in order to reduce its amount of calculation, carry out the IFFT conversion according to 2048 sampled points equally.
Step S95, said time domain sequences is carried out interpolation, its length transition is become and the said target preamble sequence time-domain sampling corresponding length of counting;
Owing in the IFFT conversion process length of time domain sequences is changed into 1024 or 2048; Sampling number is transformed to 2048 greater than the length of 2048 sequence by unified; So need be at this, through interpolation, its length is extended to and the said target preamble sequence time-domain sampling corresponding length of counting.Change for different length, the process of interpolation is also different.
Through the time domain sequences U after the interpolation
u(t), t=0,1 ... L-1, the L value is counted for the target preamble sequence time-domain sampling.
Step S96, obtain phase rotation angle according to the original position of preset frequency domain resource;
According to
according to formula 4
Generate the angle of phase place rotation.In this step, the side-play amount of frequency domain is converted into the phase deviation of time domain.
Step S97, time domain sequences after the length transition and said phase rotation angle are multiplied each other, carry out phase transition;
Realize the band bending of frequency domain through the phase transition of time domain.
Step S98, judge the form of said target preamble sequence, when its form is format 0 or format 4, execution in step S991, when its form is format 1, format2 or format 3, execution in step S992;
For different preamble Format Series Lineses, its post-treatment operations is different.
Step S991, the time domain sequences after the said phase transition is carried out do-nothing operation;
Step S992, the time domain sequences after the said phase transition carried out the repetitive operation of corresponding number of times;
Because the sequence of format 1, format2 and format 3 forms can obtain through the repetitive operation to format 0, described repetitive operation is after said time domain sequences, to connect this time domain sequences, and concrete connection number of times is decided according to different types.
Step S910, interpolation Cyclic Prefix arrive the time domain sequences after the said subsequent treatment, obtain target preamble sequence.
Add cyclic prefix CP for time domain sequences, obtain target preamble sequence.
To different preamble Format Series Lines and time domain sampling point parameters, the generative process of preamble sequence has been carried out more detailed description in the present embodiment.
Embodiment three
The generation of preamble sequence need rely on frequency domain ZC sequence among the present invention, and except that utilizing method of the prior art to generate the frequency domain ZC sequence, present embodiment discloses a kind of new frequency domain ZC sequence generation method, and its flow process is shown in figure 10, comprising:
Step S101, generate time domain ZC sequence according to formula;
Step S102, calculate said time domain ZC sequence and;
Utilize formula 5 sequence of calculations with,
Step S103, the preset frequency domain index value of basis are selected the time domain sample value from said ZC sequence;
The index value of supposing this moment is k, and according to the characteristic of ZC sequence, this moment, the time domain index value corresponding with it was u ' k, and then the sample value of this moment is x
u(u ' k), wherein u ' satisfies mod (u ' u, N
ZC)=1;
Step S104, the time domain sample value of said selection is carried out conjugate operation;
With said sample value x
u(u ' k) carry out conjugate operation to obtain
Step S105, obtain said time domain ZC sequence and with said conjugate operation after the multiplied result of time domain sample value;
Said
and said
are multiplied each other according to formula 6
The cyclic shift amount that step S106, basis are provided with in advance generates phase rotation angle;
According to cyclic shift amount C
vAccording to formula 7
Generate the angle of phase place rotation.
Step S107, multiply each other, obtain frequency domain ZC sequence with said time domain ZC sequence with the multiplied result and the said phase rotation angle of time domain sample value behind the said conjugate operation.
According to formula 8
Obtain frequency domain ZC sequence.
Because the sampling number of time domain ZC sequence is 839 or 139, with conventional DFT base-2,4,8 count requires and do not match, so directly it being carried out DFT, can computational speed to occur slow, amount of calculation is big, be difficult for problem such as realization.And the method for disclosed generation frequency domain ZC sequence has adopted a series of equivalent operation in the present embodiment; Substitute DFT computing of the prior art and cyclic shift; Owing to need not consider computing value type and the unmatched situation of DFT computing value type; Do not have the step that requires to occur, do not avoided, problems such as the amount of calculation that adopts the DFT computing to cause is big, arithmetic speed slow, difficult realization because the evaluation type does not match to the evaluation type; Further improved the formation speed of preamble sequence, and formation efficiency.
The present invention discloses a kind of generation equipment of preamble sequence; Its structure is shown in figure 11; Comprise: frequency domain ZC sequence generation unit 111, confirm unit 112, inverse discrete Fourier transform unit 113, interpolating unit 114, angle generation unit 115, first multiply each other unit 116, subsequent treatment unit 117 and add cyclic prefix unit 118, wherein:
Time domain ZC sequence generating unit 111 is used to generate frequency domain ZC sequence; Confirm that unit 112 is used for confirming the form and the time domain sampling number of target preamble sequence; Inverse discrete Fourier transform unit 113 is used for counting according to the time-domain sampling of said target preamble sequence said frequency domain ZC sequence is carried out accordingly preset small point inverse discrete Fourier transform, obtains time domain sequences; Interpolating unit 114 is used for said time domain sequences is carried out interpolation, and its length transition is become and the said target preamble sequence time-domain sampling corresponding length of counting; Angle generation unit 115 is used for obtaining phase rotation angle according to the original position of preset frequency domain resource; First unit 116 that multiplies each other is used for time domain sequences after the length transition and said phase rotation angle are multiplied each other, and carries out phase transition; Subsequent treatment unit 117 is used for form according to the said target preamble sequence time domain sequences after to said phase transition and carries out corresponding subsequent processing; Add cyclic prefix unit 118 and be used to add the time domain sequences after Cyclic Prefix arrives said subsequent treatment, obtain target preamble sequence.
The structure of frequency domain ZC sequence generation unit 111 can be identical with prior art; Also can be shown in figure 12; Comprise: multiply each other unit 1115, angle generation unit 1116 and third phase of time domain ZC sequence generating unit 1111, sum unit 1112, sampling point selected cell 1113, conjugate unit 1114, second taken advantage of unit 1117, wherein:
Time domain ZC sequence generating unit 1111 is used for generating time domain ZC sequence according to formula, sum unit 1112 be used to calculate said time domain ZC sequence with; Sampling point selected cell 1113 is used for selecting the time domain sample value according to preset frequency domain index value from said ZC sequence; Conjugate unit 1114 is used for the time domain sample value of said selection is carried out conjugate operation; Second multiply each other unit 1115 be used to obtain said time domain ZC sequence and with said conjugate operation after the multiplied result of time domain sample value; Angle generation unit 1116 is used for generating phase rotation angle according to the cyclic shift amount that is provided with in advance; Third phase takes advantage of unit 1117 to be used for said second the multiply each other result of unit and the result of said angle generation unit multiplied each other, and obtains frequency domain ZC sequence.
The structure of interpolating unit 114 is shown in figure 13, comprising: three times of up-sampling unit 1141, the first low pass filters 1142; 1143, the second low pass filter unit, 1144, the second twice up-sampling unit 1145, the first twice up-sampling unit; The 3rd low pass filter unit 1146; Each unit order successively links to each other, and imports from said three times of up-sampling unit 1141 through the time domain sequences that IFFT obtains, and it is repeatedly sampled and low-pass filtering operation; According to different time domain sequences form and sampling numbers, take out the value corresponding that is positioned at the different disposal process with it.
The present invention does not limit the structure of interpolating unit, and multiple combining form can also be arranged, and through adjusting its combining form, can realize improving the purpose of preamble sequence accuracy.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
The professional can also further recognize; The unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein; Can realize with electronic hardware, computer software or the combination of the two; For the interchangeability of hardware and software clearly is described, the composition and the step of each example described prevailingly according to function in above-mentioned explanation.These functions still are that software mode is carried out with hardware actually, depend on the application-specific and the design constraint of technical scheme.The professional and technical personnel can use distinct methods to realize described function to each certain applications, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. the generation method of a preamble sequence is characterized in that, comprising:
Generate frequency domain ZC sequence, said frequency domain ZC sequence is represented frequency domain Zadoff-Chu sequence;
Confirm the form and the time domain sampling number of target preamble sequence;
Count according to the time-domain sampling of said target preamble sequence said frequency domain ZC sequence is carried out accordingly preset small point inverse discrete Fourier transform, obtain time domain sequences;
Time domain sequences is carried out interpolation, its length transition is returned and the said target preamble sequence time-domain sampling corresponding length of counting;
Original position according to preset frequency domain resource obtains phase rotation angle;
Time domain sequences after the length transition and said phase rotation angle are multiplied each other, carry out phase transition;
Carry out corresponding subsequent processing according to the form of the said target preamble sequence time domain sequences after to said phase transition;
Add the time domain sequences after Cyclic Prefix arrives said subsequent treatment, obtain target preamble sequence.
2. method according to claim 1 is characterized in that, when the time-domain sampling of said target preamble sequence is counted when being 1024, it is 1024 inverse discrete Fourier transform that said ZC sequence is carried out sampling number.
3. method according to claim 2 is characterized in that, when the time-domain sampling of said target preamble sequence is counted more than or equal to 2048 the time, it is 2048 inverse discrete Fourier transform that said ZC sequence is carried out sampling number.
4. method according to claim 3 is characterized in that, when the form of said target preamble sequence was format 0 or format 4, said subsequent treatment was do-nothing operation.
5. method according to claim 4 is characterized in that, when the form of said target preamble sequence was format1, format2 or format3, said subsequent treatment was for to carry out the repetitive operation of corresponding number of times to the time domain sequences after the said phase transition.
6. according to any described method among the claim 1-5, it is characterized in that, generate frequency domain ZC sequence according to following process:
Generate time domain ZC sequence according to formula;
Calculate said time domain ZC sequence with;
From said ZC sequence, select the time domain sample value according to preset frequency domain index value;
The time domain sample value of said selection is carried out conjugate operation;
Obtain said time domain ZC sequence and with said conjugate operation after the multiplied result of time domain sample value;
Generate phase rotation angle according to the cyclic shift amount that is provided with in advance;
Multiply each other with said time domain ZC sequence with the multiplied result and the said phase rotation angle of time domain sample value behind the said conjugate operation, obtain frequency domain ZC sequence.
7. the generation equipment of a preamble sequence is characterized in that, comprising:
The frequency domain ZC sequence generation unit is used to generate frequency domain ZC sequence, and said frequency domain ZC sequence is represented frequency domain Zadoff-Chu sequence;
Confirm the unit, be used for confirming the form and the time domain sampling number of target preamble sequence;
The inverse discrete Fourier transform unit is used for counting according to the time-domain sampling of said target preamble sequence said frequency domain ZC sequence is carried out accordingly preset small point inverse discrete Fourier transform, obtains time domain sequences;
Interpolating unit is carried out interpolation to time domain sequences, and its length transition is returned and the said target preamble sequence time-domain sampling corresponding length of counting;
The angle generation unit is used for obtaining phase rotation angle according to the original position of preset frequency domain resource;
First unit that multiplies each other is used for time domain sequences after the length transition and said phase rotation angle are multiplied each other, and carries out phase transition;
The subsequent treatment unit is used for form according to the said target preamble sequence time domain sequences after to said phase transition and carries out corresponding subsequent processing;
Add cyclic prefix unit, be used to add the time domain sequences after Cyclic Prefix arrives said subsequent treatment, obtain target preamble sequence.
8. equipment according to claim 1 is characterized in that, said frequency domain ZC sequence generation unit comprises:
Time domain ZC sequence generating unit is used for generating time domain ZC sequence according to formula;
Sum unit, be used to calculate said time domain ZC sequence with;
The sampling point selected cell is used for selecting the time domain sample value according to preset frequency domain index value from said ZC sequence;
Conjugate unit is used for the time domain sample value of said selection is carried out conjugate operation;
First unit that multiplies each other, be used to obtain said time domain ZC sequence and with said conjugate operation after the multiplied result of time domain sample value;
The angle generation unit is used for generating phase rotation angle according to the cyclic shift amount that is provided with in advance;
Second unit that multiplies each other is used for said first the multiply each other result of unit and the result of said angle generation unit multiplied each other, and obtains frequency domain ZC sequence.
9. according to claim 7 or 8 described equipment, it is characterized in that said interpolating unit comprises: three times of up-sampling unit that order links to each other; First low pass filter, the first twice up-sampling unit, second low pass filter unit; The second twice up-sampling unit, the 3rd low pass filter unit.
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