CN102026219A - Method and corresponding device for generating and transmitting wireless channel measurement reference signal - Google Patents
Method and corresponding device for generating and transmitting wireless channel measurement reference signal Download PDFInfo
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- CN102026219A CN102026219A CN2009101760379A CN200910176037A CN102026219A CN 102026219 A CN102026219 A CN 102026219A CN 2009101760379 A CN2009101760379 A CN 2009101760379A CN 200910176037 A CN200910176037 A CN 200910176037A CN 102026219 A CN102026219 A CN 102026219A
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- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
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Abstract
The invention relates to a method for generating a wireless channel measurement reference signal, which is used for a multifrequency wave communication system. In the method, a first subsequence and a second subsequence are selected according to reference signal sequence length NSeq, wherein, NSeq=N1+N2, N1 is the length of the first subsequence, N2 is the length of the second subsequence, R=N1/N2, Nseq, N1, N2 and R are natural numbers, and the length is represented by bit numbers; and signal reference sequence is generated according to the first subsequence and the second subsequence, wherein R numbered bits among the [i(R+1)]th-[i(R+1)+R]th bits of the signal reference sequence are the (i.R)th-(i.R+R-1)th bits of the first subsequence, the rest one bit is the i-th bit of the second subsequence, i is equal to 0,1,...,N2-1, and when the values of i are different, the relative positions of the one bit and the R numbered bits are fixed. In the invention, when limiting factors exist in the reference signal sequence, the original mean ratio performance of the sequences can be well kept.
Description
Technical field
The present invention relates to the communications field, particularly, relate to generation, sending method and the device of wireless channel measurement reference signal.
Background technology
Channel measurement is the communication system necessary part, as use the wireless communication system of OFDM (OFDM:Orthogonal Frequency Division Multiplexing) and/or MIMO (Multiple InputMultiple Output, multiple-input and multiple-output) technology.Present communication system is generally used reference signal, and promptly pilot tone is used for channel measurement.The called reference signal is meant and itself does not carry user data information, and is used for the signal of estimating user data place channel or other channel parameters.In the MIMO-OFDM system, need the situation (i.e. feedback) of receiving terminal report wireless channel, adjust the transmission strategy of signal to make things convenient for transmitting terminal, improve the performance of system.Reference signal in the system mainly contains at present: general pilot, dedicated pilot, leading, middle pilot tone and Sounding (no general middle translation) signal.
Middle pilot tone is meant: in the MIMO-OFDM system, take the reference signal of an OFDM symbol in a downlink radio resource frame.So-called descending, be meant that wireless signal sends to user terminal from the base station.The Sounding signal is meant: in the MIMO-OFDM system, take the reference signal of an OFDM symbol in the ascending wireless resource frame.So-called up, be meant that wireless signal sends to the base station from user terminal.The channel content that needs to measure mainly comprises order information (RI, Rank Information), channel quality information (CQI, Channel Quality Information) and pre-coding matrix sequence number (PMI, Preferred Matrix Index).
The base station numbering sum that uses in the number of reference signal sequence and the communication system is relevant, but if corresponding independent pilot frequency sequence of each numbering, then need bigger memory space in terminal, by constructing two sub-arrangement sets, from two sub-arrangement sets, respectively select a subsequence then respectively and can reduce memory space according to certain rule composition pilot frequency sequence.Simultaneously, because ofdm system itself, powerful situation can appear in the transmitting terminal signal, even above the linear working range of transmitting terminal power amplifier, causes the distortion of signal and influences the effect of channel measurement.
Therefore, need to select the low sequence of power peak-to-average force ratio (PAPR), reduce the time domain power peak of reference signal,, increase the accuracy of channel measurement so that promote the power of reference signal with respect to data-signal.Existing sequence or sequence are right at present, and as the Golay sequence, peak-to-average force ratio is not more than 2.But in the particular communication system, the applicable elements of these sequences can not satisfy usually, and such as expanding carrying out brachymemma or (by conversion) single sequence or sequence according to available sub-carrier number, then the character of sequence can be destroyed.When sending pilot frequency sequence, need to adopt rational multiplex mode, improve the accuracy of channel measurement, also will avoid (mainly being leading, preamble) obscuring with other reference signals to avoid the interference of neighbor cell.So-called subcarrier mapping is meant that a data (as sequence) are put on the subcarrier of frequency domain symbol correspondingly.How to take all factors into consideration these limiting factor design pilot frequency sequences, rational solution is not arranged at present as yet.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of generation method of wireless channel measurement reference signal, when there are some limiting factors in reference signal sequence, also can keep the character of the original peak-to-average force ratio of these sequences preferably.
In order to address the above problem, the invention provides a kind of generation method of wireless channel measurement reference signal, be used for the multi-frequency waves communication system, this generation method comprises:
According to the reference signal sequence length N
SeqSelect one first subsequence and one second subsequence, and N is arranged
Seq=N
1+ N
2, N
1Be the length of first subsequence, N
2Be the length of second subsequence, R=N
1/ N
2, N
Seq, N
1, N
2, R is a natural number, described length is represented with bit number;
Generate reference signal sequence according to described first subsequence and second subsequence, the iR~iR+R-1 the bit of R bit for this first subsequence arranged in this reference signal sequence i (R+1)~i (R+1)+R bit, all the other 1 bits are i the bit of this second subsequence, i=0,1, ..., N
2-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed.
Further, above-mentioned generation method also can have following characteristics:
Described N
SeqDetermine according to following formula: N
Sc=N
Dec* N
Seq+ N
0, wherein, N
ScBe the subcarrier number that reference signal sequence can be used, N
DecBe natural number, N
0Be integer, 0≤N
0<N
Dec
And, N
1And N
2Value follow following agreement:
Wherein, α
1, β
1, γ
1, α
2, β
2, γ
2〉=0, α
1〉=α
2
Further, above-mentioned generation method also can have following characteristics: the formula during according to described first subsequence and second subsequence generation reference signal sequence is as follows:
Wherein,
Be the reference signal sequence that will generate,
Be first subsequence, gather from first subsequence
Select,
Be second subsequence, gather from second subsequence
Select m
1=0,1 ..., M
1-1, m
2=0,1 ..., M
2-1, M
1, M
2Be respectively G
1, G
2In the subsequence number that comprises, L=R+1, m=0,1 ..., N
Seq-1, m
0Be integer, and 0≤m
0≤ R, subscript g (m
1, m
2) be m
1, m
2Function, mod (x, y)=xmody, the expression modular arithmetic.
Further, above-mentioned generation method also can have following characteristics:
Described g (m
1, m
2) equaling Cell_ID, Cell_ID is that the sequence number of base station, sector or sub-district has:
m
1=Cell_ID
b(m′:1),m
2=Cell_ID
b(m″:m′+1)
Wherein, Cell_ID
bBe the binary representation of Cell_ID, Cell_ID
b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM ' to the 1st, Cell_ID
b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM " to m '+1, m ', m " being natural number, m '<m ", M
1=2
M ', M
2=2
M " m '
Further, above-mentioned generation method also can have following characteristics: m
0=0, R or R/2.
Further, above-mentioned generation method also can have following characteristics: described first subsequence and second subsequence are the Golay complementary series.
Further, above-mentioned generation method also can have following characteristics: described reference signal is middle pilot tone or Sounding signal.
Further, above-mentioned generation method also can have following characteristics:
The subcarrier number N that described communication system is supported
FFTBe 512 multiple, the sub-carrier number N that reference signal can be used
Sc=432 * [1+log2 (N
FFT/ 512)];
N
DecThe placement of expression reference signal when frequency domain is uniformly-spaced placed represented N at interval with sub-carrier number
DecBe a fixed value or the N between 0~9
Dec=3 * N
t, N
tNumber of transmit antennas for the dispensing device configuration that sends reference signal;
At definite N
1, N
2The time, make β
1, γ
1, β
2, γ
2Be 0, M
1=8,16 or 32, M
2=8,16 or 32.
Such scheme uses the pilot frequency sequence of two length subsequence identical or inequality (or sequence to) configurations, compare existing program, can be applicable to the more applications scene, in some limiting factors that in satisfying pilot frequency sequence, exist (as sequence is carried out brachymemma or expansion), the character that can keep these subsequence low peak average ratios preferably helps exactly measured channel and feeds back.
The another technical problem that the present invention will solve provides a kind of generation and sending method and device of wireless channel measurement reference signal, can keep the character of subsequence low peak average ratio, and makes a distinction with the targeting signal of wireless communication system.
In order to address the above problem, the invention provides a kind of generation and sending method of wireless channel measurement reference signal, be used for multi-carrier communications systems, this sending method comprises:
Generation method according to above-mentioned arbitrary wireless channel measurement reference signal generates the reference signal sequence that will send;
Dispensing device equally spaced is mapped on frequency domain on all available subcarriers except that the direct current subcarrier with reference signal sequence or to the sequence that obtains after this reference signal sequence conversion, obtain the frequency domain reference signal, send after this frequency domain reference signal is transformed to time-domain symbol.
Further, above-mentioned generation and sending method also can have following characteristics:
Described dispensing device is mapped to reference signal sequence by following formula the subcarrier of the symbol correspondence that is used for transmission of reference signals:
Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on the subcarrier,
Be
Function;
Expression is not more than the maximum integer of x, k
0Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N
UsedIt is the available sub-carrier number that comprises the direct current subcarrier.
Further, above-mentioned generation and sending method also can have following characteristics:
Wherein, Cell_ID is the sequence number of base station, sector or sub-district, k
0A kind of in the following manner comes value:
First kind, k
0=n
t-1;
Second kind, k
0For satisfying the value of following two conditions:
Wherein, k
0=0,1 ..., 8, n is a frame number, BRO (x, 3) is the inverted order of 3 bit x;
The third, k
0For satisfying the value of following condition:
k
0=n
t-1+mod(Cell_ID,3)×N
Dec
More than various in, N
tBe the number of transmit antennas of described dispensing device configuration, n
t=1,2 ..., N
tBe the transmitting antenna sequence number.
Correspondingly, the generation of wireless channel measurement reference signal provided by the invention and dispensing device comprise: subsequence provides module, is used to provide the set of first subsequence
Gather with second subsequence
G
1In comprise M
1Individual length is N
1First subsequence, G
2In comprise M
2Individual length is N
2Second subsequence, m
1=0,1 ..., M
1-1, m
2=0,1 ..., M
2-1, N
SeqBe the length of reference signal sequence, R=N
1/ N
2, N
Seq, N
1, N
2, R is a natural number, length is represented with bit number;
Subsequence is selected module, is used for selecting one first subsequence from the set of first subsequence
From the set of second subsequence, select one second subsequence
The sequence generation module is used for basis
With
Generate reference signal sequence, have R bit to be in this reference signal sequence i (R+1)~i (R+1)+R bit
The iR~iR+R-1 bit, all the other 1 bits are
I bit, i=0,1 ..., N
2-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed;
The sequence sending module, be used for the reference signal sequence that will generate or the sequence that obtains after this reference signal sequence conversion equally spaced is mapped to all available subcarriers except that the direct current subcarrier on frequency domain, obtain the frequency domain reference signal, send after transforming to time-domain symbol again.
Further, said apparatus also can have following characteristics:
Described subsequence provides first subsequence that module provides and the length N of second subsequence
1, N
2Value follow following agreement:
Wherein, α
1, β
1, γ
1, α
2, β
2, γ
2〉=0, α
1〉=α
2, and N is arranged
Sc=N
Dec* N
Seq+ N
0, N
ScBe the subcarrier number that reference signal sequence can be used, N
DecBe natural number, the placement interval of expression reference signal when frequency domain is uniformly-spaced placed, N
0Be integer, 0≤N
0<N
Dec
Described sequence generation module basis
With
Generate reference signal sequence
The time formula as follows:
Wherein, L=R+1, m=0,1 ..., N
Seq-1, m
0Be integer, and m
0=0, R or R/2, subscript g (m
1, m
2) be m
1, m
2Function, mod (x, y)=xmody, the expression modular arithmetic.
Further, said apparatus also can have following characteristics:
Described subsequence selects module to select from set of first subsequence and the set of second subsequence according to following formula
With
m
1=Cell_ID
b(m′:1),m
2=Cell_ID
b(m″:m′+1)
Wherein, Cell_ID
bBe the binary representation of Cell_ID, described g (m
1, m
2) equaling Cell_ID, Cell_ID is the sequence number of base station, sector or sub-district, Cell_ID
b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM ' to the 1st, Cell_ID
b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM " to m '+1, m ', m " being natural number, m '<m ", M
1=2
M ', M
2=2
M " m '
Further, said apparatus also can have following characteristics:
Described sequence sending module is mapped to reference signal sequence by following formula the subcarrier of the symbol correspondence that is used for transmission of reference signals:
Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on the subcarrier,
Expression is not more than the maximum integer of x, and k0 is an integer, and expression is used for the sequence number of first subcarrier of transmitted reference signal, N
UsedBe the available sub-carrier number that comprises the direct current subcarrier, Cell_ID is the sequence number of base station, sector or sub-district, k
0A kind of in the following manner comes value:
First kind, k
0=n
t-1;
Second kind, k
0For satisfying the value of following two conditions:
Wherein, k
0=0,1 ..., 8, n is a frame number, BRO (x, 3) is the inverted order of 3 bit x;
The third, k
0For satisfying the value of following condition:
k
0=n
t-1+mod(Cell_ID,3)×N
Dec
More than various in, N
tBe the number of transmit antennas of described dispensing device configuration, n
t=1,2 ..., N
tBe the transmitting antenna sequence number.
Further, said apparatus also can have following characteristics:
First subsequence and second subsequence that described subsequence provides module to provide are the Golay complementary series; Described sequence sending module sends described reference signal sequence as middle pilot tone or Sounding signal.
The pilot frequency sequence that such scheme sends, compare existing program, the character that can keep the subsequence low peak average ratio, because sequence fractional reuse, has lower memory space, and these subcarrier mapping modes can avoid time domain periodic signal to occur, thereby can make a distinction with other reference signals of wireless communication system (mainly being leading).Further, be set to be used to transmit middle pilot frequency sequence, can reduce area interference, improve the accuracy of channel estimating by the part available subcarrier that satisfies the such scheme condition.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention jointly with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of time domain OFDM symbol.
Fig. 2 is R=2, m
0The schematic diagram of=2 o'clock reference signal sequence constructive method.
Fig. 3 is two couples of k of the embodiment of the invention
0=1, N
Dec=3, N
Used=433, N
FFTThe schematic diagram of the reference signal subcarrier mapping pattern of=512 o'clock certain antennas.
Fig. 4 is the schematic diagram of the cumulative distribution function (CDF) of the sequence peak-to-average force ratio that constitutes of table 1, obtains by emulation experiment.
Fig. 5 is before the Golay sequence of 3096 128 bits is shone upon and the PAPR contrast after the mapping, obtains by emulation experiment, and CDF represents cumulative distribution function, N1/N2=2.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention, pilot tone or Sounding signal in the middle of reference signal refers to, but the present invention is not limited to this.Middle pilot frequency carrier wave is distributed on the whole OFDM symbol.Middle pilot tone is used for terminal and carries out channel measurement, so that obtain the down channel coefficient, at open loop MIMO (Multi Input MultiOutput, multiple-input and multiple-output) in, middle pilot tone can be used for channel quality indication (Channel QualityIndication abbreviates CQI as) to be estimated, in closed-loop MIMO, middle pilot tone can be used for pre-coding matrix sequence number (Preferred Matrix Index, calculating PMI).The base station utilizes the downlink precoding matrix sequence number of Sounding calculated signals user data, to improve the descending performance of system.
Embodiment one
For having N
FFTIn the OFDM frequency domain symbol of individual subcarrier, operable subcarrier number is N
Used, reject the direct current subcarrier, reference signal sequence can with sub-carrier number be N
Sc=N
Used-1, choose specific reference signal sequence length N
Seq, make:
N
Sc=N
Dec* N
Seq+ N
0, N
Seq=N
1+ N
2=(R+1) N
2, N wherein
Dec, N
1, N
2, R=N
1/ N
2Be natural number, 0≤N
0<N
DecIt is integer.
Generate two sub-arrangement sets
For length is N
1Sequence, m
1=0,1 ..., M
1-1, the subsequence set
For length is N
2Sequence, m
2=0,1 ..., M
2-1.Subsequence in these two sub-arrangement sets has the character of low peak average ratio.
Utilize two new reference signal sequences that sub-arrangement set generates that generate
Shown in (1.1):
L=R+1 wherein, m=0,1 ..., N
Seq-1, m
0Be integer, and 0≤m
0≤ R, subscript g (m
1, m
2) be m
1, m
2Function, (x y)=xmody, is modular arithmetic to mod.According to this formula, in i (R+1) in this reference signal sequence~i (R+1)+R bit, the iR~iR+R-1 the bit of R bit for this first subsequence arranged, and all the other 1 bits are i the bit of this second subsequence, and the relative position of this 1 bit and this R bit is fixed, as being the 1st bit or last 1 bit or certain the middle bit in each group, wherein, i=0,1, ..., N
2-1.As shown in Figure 2, show R=2, m
0, generate the schematic diagram of new reference signal sequence S by subsequence A and B at=2 o'clock.
In the present embodiment, g (m
1, m
2) equaling Cell_ID, Cell_ID is the sequence number of base station, sector or sub-district, uses y=x
b(m ': 1) expression press m ' that the order of big-endian intercepts binary number x to the 1st, has:
m
1=Cell_ID
b(m′:1),m
2=Cell_ID
b(m″:m′+1),(1.2)
Wherein, m ', m " being natural number, m '<m ", M
1=2
M ', M
2=2
M " m 'Because adopting the sequence number of base station, sector or sub-district determines from the selected subsequence of subsequence set, the interference that can avoid neighbor cell to adopt identical reference signal sequence to produce.
Dispensing device is mapped to reference signal sequence the subcarrier of the symbol correspondence that is used for transmission of reference signals by the mode shown in (1.3):
Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on the subcarrier,
Be
Function;
Expression is not more than the maximum integer of x; k
0Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, by N
0, transmitting antenna the factors such as sequence number of sequence number, sub-district (or sector, base station, segmentation) sequence number, subframe sequence number, frame number, OFDM symbol among one or more decision.
According to following formula, reference signal sequence can be evenly distributed on the N except that the direct current subcarrier
Sc-N
0On the individual available subcarrier, the signal that the direct current subcarrier sends is 0.
Frequency domain reference signal S needs to transform to the time domain OFDM symbol before transmission, as adopting:
In the formula, f
cBe the center carrier frequencies of system, Δ f is the sub-carrier frequencies interval, T
gBe the prefix length of OFDM symbol, 0≤t≤T
S, T
SBe the length of OFDM symbol, referring to Fig. 1; K element of S (k) expression sequence, k=0,1 ..., N
Used-1.The present invention also can adopt other existing frequency domain reference signal sequence S to be transformed to the mode of time domain OFDM symbol, no longer explanation among the aftermentioned embodiment.
Above-mentioned dispensing device can have the system equipment of controlled function or the dispensing device of terminal equipments such as mobile phone, palmtop PC for base station or relay station etc.
The G of present embodiment
1, G
2In subsequence be Golay complementary series (being also referred to as the Golay sequence), be not limited thereto sequence certainly, also can make other sequences that has the low-power peak-to-average force ratio arbitrarily, wherein the definition of Golay sequence and generation method are as follows:
The non-periodic autocorrelation function of defined nucleotide sequence a is:
Wherein N is the length of sequence.If sequence to (a b) satisfies following condition, then is called the Golay complementary series:
ρ
a(k)+ρ
b(k)=0,k≠0 (1.6)
In the present embodiment, N
1And N
2Value follow following agreement:
Be natural number, α
1, β
1, γ
1, α
2, β
2, γ
2〉=0.Especially, work as β
1=γ
1=β
2=γ
2=0 o'clock, have
α
1〉=α
2Utilize formula (1.7) and N
Seq(N
Seq=N
1+ N
2) can calculate corresponding N
1And N
2
G
1In sequence be that length is N
1The Golay sequence, G
2In sequence be that length is N
2The Golay sequence, N
1, N
2Satisfy formula (1.7), utilize formula (1.1) to generate reference signal sequence.
Below each embodiment be based on the concrete utilization of embodiment one.
Embodiment two
The subcarrier number of supposing a MIMO-OFDM wireless communication system is N
FFT=512, configuration N
t=2 transmitting antennas, sub-district, sector or base station be numbered Cell_ID, reject the direct current subcarrier, reference signal is at N
ScPress N on the individual subcarrier
Dec=3 uniformly-spaced place promptly every N
DecHave 1 subcarrier to be used to place reference signal in the individual subcarrier, reference signal can with sub-carrier number be 432, corresponding N
1=128, N
2=16.
The corresponding reference burst is obtained by following formula:
Cell_ID wherein
bBe binary representation, ∏
X, yRepresent a subsequence, x is the lateral coordinates of table 1, and y is the along slope coordinate of table 1, such as ∏
0,1=9AC0." others " expression " when m is worth for other ", " others " in other formulas herewith.
Suppose Cell_ID=(110011101)
b=413, Cell_ID is then arranged
b(8:5)=(1001)
b=9, Cell_ID
b(4:1)=(1101)
b=13, log
2(N
FFT/ 512)=1, have:
Table 1
Reference signal sequence is mapped on the subcarrier by following rule:
k
0For satisfying the value of following condition: k
0=n
t-1 (1.11)
Wherein, N
tBe the number of transmit antennas that the dispensing device that sends reference signal disposes, n
t=1,2 ..., N
tBe the transmitting antenna sequence number.
Fig. 3 is k
0=1, N
Dec=3, N
Used=433, N
FFTThe schematic diagram of the reference signal subcarrier mapping pattern of=512 o'clock certain antennas.N wherein
FFTBe counting of the discrete Fourier transform of frequency domain transform during to time domain, that is the subcarrier number of frequency domain symbol.
Embodiment three
If the subcarrier number that MIMO-OFDM wireless communication system can be supported is N
FFT=512,1024,2,048 three kinds, each N
FFTCorresponding different system bandwidth, sub-district, sector or base station be numbered Cell_ID, the reference signal on the every day line is pressed N except that the direct current carrier wave
Dec=9 uniformly-spaced place, reference signal can with sub-carrier number be 432 * [1+log
2(N
FFT/ 512)], corresponding N
1=N
FFT/ 16, N
2=N
FFT/ 32.
The corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yBe a subsequence, x is the lateral coordinates of table 2, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, Cell_ID then
b(8:5)=(1001)
b=9, Cell_ID
b(4:1)=(1101)
b=13, log
2(N
FFT/ 512)=1, M
1=M
2=16, have:
Table 2 ∏
X, yHexadecimal representation (left side is a low level)
Reference signal sequence is mapped on the subcarrier by following rule:
k
0For satisfying the value of following two conditions:
Wherein, k
0=0,1 ..., 8, n
t=1,2 ..., N
tBe the transmitting antenna sequence number, n is a frame number, and BRO (x, 3) is the inverted order of 3 bit x.
First becomes example, and the subsequence set G1 of this change row has 16 subsequences, and 32 subsequences are arranged among the G2, and other parameters are all identical with embodiment three, become in the example M at this
1=16, m '=4, M
2=32, m "=9, correspondingly, the corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yBe a subsequence, x is the lateral coordinates of table 2, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, Cell_ID then
b(9:5)=(1001)
b=25, Cell_ID
b(4:1)=(1101)
b=13, log
2(N
FFT/ 512)=1, have:
The mapping mode of reference signal sequence is constant, shown in (1.14) (1.15) (1.16).
Second becomes example, and the subsequence set G1 of this changes example has 32 subsequences, and 16 subsequences are arranged among the G2, other parameters all with the embodiment three-phase while, in this change example, owing to M
1=32, m '=5, M
2=16, m "=9.Correspondingly, the corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yBe a subsequence, needing table 2 lateral coordinates be that subsequence number in the subsequence set of 2 row correspondence is increased to 32, and then x is the lateral coordinates of this table, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, Cell_ID then
b(9:6)=(1100)
b=12, Cell_ID
b(5:1)=(11101)
b=29, log
2(N
FFT/ 512)=1, have:
The mapping mode of reference signal sequence is constant, shown in (1.14) (1.15) (1.16).
The 3rd becomes example, the M of this change example
0Value be mod (Cell_ID, 3), other parameters are all identical with embodiment three, correspondingly, the corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yRepresent a sequence, x is the lateral coordinates of table 2, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, Cell_ID then
b(8:5)=(1001)
b=9, Cell_ID
b(4:1)=(1101)
b=13, log
2(N
FFT/ 512)=1, mod (Cell_ID, 3)=2 has:
The mapping mode of reference signal sequence is constant, shown in (1.14) (1.15) (1.16).
Embodiment four
The subcarrier number that MIMO-OFDM wireless communication system can be supported is N
FFT=512,1024,2,048 three kinds, each N
FFTCorresponding different system bandwidths can be configured to N
t=2,4,8 antennas, sub-district, sector or base station be numbered Cell_ID, reject the direct current subcarrier, reference signal is at N
ScPress N on the individual subcarrier
Dec=3 * N
tUniformly-spaced place, reference signal can with sub-carrier number be 432 * [1+log
2(N
FFT/ 512)], corresponding N
1=N
FFT/ (4 * N
t), N
2=N
FFT/ (32 * N
t).
The corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yBe a subsequence, x is the lateral coordinates of table 3, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, N
t=2, Cell_ID then
b(8:5)=(1001)
b=9, Cell_ID
b(4:1)=(1101)
b=13, log
2(N
FFT/ 512)=1, M
1=M
2=16, have:
Table 3 ∏
X, yHexadecimal representation (left side is a low level)
Continuous table 3
∏ x,y | 5 |
0 | |
1 | |
2 | |
3 | |
4 | |
5 | |
6 | |
7 | |
8 | 121212EDED12EDED4747B847B84747471D1D1DE2E21DE2E24848B748B7484848 |
9 | 050AC9C63639FAF505F5C939C93905F5505F9C93636CAFA050A09C6C9C6C50A0 |
10 | 000F555A5A550F0033C3669669993CCC000FAAA55A55F0FF33C399696999C333 |
11 | 050A36393639050A05F5C93936C6FA0AAFA09C939C93AFA0AF5F63939C6C50A0 |
12 | 1212E2E24747B7B712EDE21D47B8B74812EDE21DB84748B71212E2E2B8B84848 |
13 | 00335A690F3C55663300695A3C0F665500CC5A96F03CAA6633FF69A5C30F9955 |
14 | 00550F5A5A0F55003366C396693C99CC00AA0FA55AF055FF3399C36969C39933 |
15 | 14271B28EBD8E4D714D81BD7EB27E4281427E4D71427E4D714D8E42814D8E428 |
16 | 00330F3C3C0F330055995A9669A566AA0033F0C33C0FCCFF5599A56969A59955 |
17 | 141414EB14EB14141B1B1BE4E41BE4E4D8D8D827D827D8D8D7D7D72828D72828 |
18 | 00330F3C0FC300CC6655695A69A566AA0033F0C30FC3FF33665596A569A59955 |
19 | 00F066960FFF699955A533C35AAA3CCC33C355A5C333A555669600F09666F000 |
20 | 000F33C3333C00F0AAA599699996AA5A5A55699969665AAAF0FFC333C3CCF000 |
21 | 00330F3C0FC300CC5566A5965A96AA66AA99A596A569AA66FFCC0F3CF03C00CC |
22 | 124712471D481D48EDB81247E2B71D4812B8ED471DB7E248ED47ED47E248E248 |
23 | 00333C0F0F3C33005566695AA59699AA00CC3CF00FC333FF559969A5A5699955 |
24 | 141414EB1B1B1BE414EB14141BE41B1B141414EBE4E4E41BEB14EBEB1BE41B1B |
25 | 00F033C30FFFC333669655A56999A55555A566965AAA966633C300F03CCCF000 |
26 | 0536AF9C36059CAF0536AF9CC9FA63500A39A093390A93A0F5C65F6C390A93A0 |
27 | 0536360550636350FA36C905AF639C500536C9FAAF9C6350FA3636FA509C9C50 |
28 | 000F3C33333C0F00555A696666695A55000F3C33CCC3F0FFAAA5969966695A55 |
29 | 005566330F5A693C00AA66CC0FA569C300556633F0A596C3FF5599330FA569C3 |
30 | 00553399336600AA5A0F69C3693C5AF000553399CC99FF555A0F69C396C3A50F |
31 | 00550F5A0F5A00556633693C693C663300AAF05A0FA5FF5566CC963C69C39933 |
Reference signal sequence is mapped on the subcarrier by following rule:
Wherein: k
0For satisfying the value of following condition:
k
0=n
t-1+mod(Cell_ID,3)×N
Dec (1.26)
n
t=1,2 ..., N
tBe the transmitting antenna sequence number.
First becomes example, and the subsequence set G1 of this change example has 16 subsequences, and 32 subsequences are arranged among the G2, and other parameters are all identical with embodiment four.Become in the example at this, because M
1=16, m '=4, M
2=32, so m "=9.Correspondingly, the corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yRepresent a sequence, x is the lateral coordinates of table 3, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, N
t=2, Cell_ID then
b(9:5)=(11001)
b=25, Cell_ID
b(4:1)=(1101)
b=13, log
2(N
FFT/ 512)=1, have:
The mapping mode of reference signal sequence is constant, shown in (1.25) (1.26).
Second becomes example, and the subsequence set G1 of this change example has 32 subsequences, and 16 subsequences are arranged among the G2, and other parameters are all identical with embodiment four.Become in the example at this, because M
1=32, m '=5, M
2=16, so m "=9.Correspondingly, the corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yRepresent a sequence, x is the lateral coordinates of table 3, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=413, N
FFT=1024, N
t=2 Cell_ID
b(9:6)=(1100)
b=12, Cell_ID
b(5:1)=(11101)
b=29, log
2(N
FFT/ 512)=1, have:
The mapping mode of reference signal sequence is constant, shown in (1.25) (1.26).
The 3rd becomes example, the M of this change example
0Value be 4*mod (Cell_ID, 3), other parameters are all identical with embodiment four, correspondingly, the corresponding reference burst is obtained by following formula under the different system bandwidth:
Cell_ID wherein
bBe binary representation, ∏
X, yBe a subsequence, x is the lateral coordinates of table 3, and y is an along slope coordinate, such as ∏
0,1=9AC0.Cell_ID=(110011101) for example
b=412, N
FFT=1024, N
t=2, Cell_ID then
b(8:5)=(1001)
b=9, Cell_ID
b(4:1)=(1100)
b=12, log
2(N
FFT/ 512)=1,4*mod (Cell_ID, 3)=4 has:
The mapping mode of reference signal sequence is constant, shown in (1.25) (1.26).
The PAPR of the reference signal sequence of such scheme generation once is described below theoretically.
PAPR is defined as:
X=[x wherein
0, x
1, x
2..., x
N-1]
TBe the signal on the time domain, and
Wherein, c
kBe the data on the subcarrier k.In the real system, digital signal finally transfers analog signal to, and the oversampling that generally carries out four times gets final product.Adopt 8 times of oversamplings when supposing emulation.That is:
Corresponding inverse discrete Fourier transform (IDFT) is:
L=8 wherein.
The non-periodic autocorrelation function of defined nucleotide sequence a (Aperiodic Auto-Correlation Function AACF) is:
Or
Wherein N is the length of sequence.If sequence to (a b) satisfies following condition, then is called Golay complementary series (or Golay sequence):
ρ
a(k)+ρ
b(k)=0,k≠0 (2.7)
If (a, related multinomial b) they are a (z), b (z), promptly
Then have
a(z)a(z
-1)+b(z)b(z
-1)=2N (2.9)
Formula (2.7) and (2.9) equivalence, because:
See the situation when the golay sequence uniformly-spaced placed again,
By formula (2.11), its PAPR is:
Be provided with Golay sequence a, the following formation of sequence a ':
m
0=0,2
P-q, 2
P-q-1Then have:
PAPR(a′)≤2 (2.16)
Prove as follows:
Formula (2.8) is made an amendment slightly:
And
f
0(i-j)=f
a′(i-j)-k
0=f
a′(i)-f
a′(j) (2.19)
Make k
0=m ", following formula satisfies formula (2.19):
Formula (2.18) substitution (2.10) then has:
Thereby for a ' (z), formula (2.9) is set up.
Fig. 4 is L=3, m
0The CDF of the PAPR of=0,1,2: 3096 Golay sequence.
If two Golay sequence [a
1, a
2] form a new sequence a, suppose that the maximum of its time domain is respectively m
1, m
2And drop on the same quadrant of complex plane, then, then have because DFT is linear transformation:
Fig. 5 is the forward and backward PAPR contrast of mapping, shines upon forward and backward PAPR as can be seen and changes very little.
By above explanation as can be seen, embodiments of the invention when having limiting factor as expansion or brachymemma, can keep the character of low peak average ratio with the reference signal sequence of the subsequence formation of two low peak average ratios.
Such scheme also can use at wireless communication system of multicarrier code division multiplexing (MC-CDMA:Multi-Carrier CodeDivision Multiple Access) and/or MIMO technology or the like.
Claims (16)
1. the generation method of a wireless channel measurement reference signal is used for the multi-frequency waves communication system, and this generation method comprises:
According to the reference signal sequence length N
SeqSelect one first subsequence and one second subsequence, and N is arranged
Seq=N
1+ N
2, N
1Be the length of first subsequence, N
2Be the length of second subsequence, R=N
1/ N
2, N
Seq, N
1, N
2, R is a natural number, described length is represented with bit number;
Generate reference signal sequence according to described first subsequence and second subsequence, the iR~iR+R-1 the bit of R bit for this first subsequence arranged in this reference signal sequence i (R+1)~i (R+1)+R bit, all the other 1 bits are i the bit of this second subsequence, i=0,1, ..., N
2-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed.
2. generation method as claimed in claim 1 is characterized in that:
Described N
SeqDetermine according to following formula: N
Sc=N
Dec* N
Seq+ N
0, wherein, N
ScBe the subcarrier number that reference signal sequence can be used, N
DecBe natural number, N
0Be integer, 0≤N
0<N
Dec
And, N
1And N
2Value follow following agreement:
Wherein, α
1, β
1, γ
1, α
2, β
2, γ
2〉=0, α
1〉=α
2
3. generation method as claimed in claim 2 is characterized in that, the formula during according to described first subsequence and second subsequence generation reference signal sequence is as follows:
Wherein,
Be the reference signal sequence that will generate,
Be first subsequence, gather from first subsequence
Select,
Be second subsequence, gather from second subsequence
Select m
1=0,1 ..., M
1-1, m
2=0,1 ..., M
2-1, M
1, M
2Be respectively G
1, G
2In the subsequence number that comprises, L=R+1, m=0,1 ..., N
Seq-1, m
0Be integer, and 0≤m
0≤ R, subscript g (m
1, m
2) be m
1, m
2Function, mod (x, y)=xmody, the expression modular arithmetic.
4. generation method as claimed in claim 3 is characterized in that:
Described g (m
1, m
2) equaling Cell_ID, Cell_ID is that the sequence number of base station, sector or sub-district has:
m
1=Cell_ID
b(m′:1),m
2=Cell_ID
b(m″:m′+1)
Wherein, Cell_ID
bBe the binary representation of Cell_ID, Cell_ID
b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM ' to the 1st, Cell_ID
b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM " to m '+1, m ', m " being natural number, m '<m ", M
1=2
M ', M2=2
M " m '
5. generation method as claimed in claim 3 is characterized in that m
0=0, R or R/2.
6. generation method as claimed in claim 1 is characterized in that, described first subsequence and second subsequence are the Golay complementary series.
7. generation method as claimed in claim 1 is characterized in that, described reference signal is middle pilot tone or Sounding signal.
8. as claim 3 or 4 described generation methods, it is characterized in that:
The subcarrier number N that described communication system is supported
FFTBe 512 multiple, the sub-carrier number N that reference signal can be used
Sc=432 * [1+log
2(N
FFT/ 512)];
N
DecThe placement of expression reference signal when frequency domain is uniformly-spaced placed represented N at interval with sub-carrier number
DecBe a fixed value or the N between 0~9
Dec=3 * N
t, N
tNumber of transmit antennas for the dispensing device configuration that sends reference signal;
At definite N
1, N
2The time, make β
1, γ
1, β
2, γ
2Be 0, M
1=8,16 or 32, M
2=8,16 or 32.
9. the generation of a wireless channel measurement reference signal and sending method are used for multi-carrier communications systems, and this sending method comprises:
Generate the reference signal sequence that will send according to the described generation method of arbitrary claim in the claim 1~7;
Dispensing device equally spaced is mapped on frequency domain on all available subcarriers except that the direct current subcarrier with reference signal sequence or to the sequence that obtains after this reference signal sequence conversion, obtain the frequency domain reference signal, send after this frequency domain reference signal is transformed to time-domain symbol.
10. generation as claimed in claim 9 and sending method is characterized in that:
Described dispensing device is mapped to reference signal sequence by following formula the subcarrier of the symbol correspondence that is used for transmission of reference signals:
Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on the subcarrier,
Be
Function;
Expression is not more than the maximum integer of x, k
0Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N
UsedIt is the available sub-carrier number that comprises the direct current subcarrier.
11. generation as claimed in claim 10 and sending method is characterized in that:
Wherein, Cell_ID is the sequence number of base station, sector or sub-district, k
0A kind of in the following manner comes value:
First kind, k
0=n
t-1;
Second kind, k
0For satisfying the value of following two conditions:
Wherein, k
0=0,1 ..., 8, n is a frame number, BRO (x, 3) is the inverted order of 3 bit x;
The third, k
0For satisfying the value of following condition:
k
0=n
t-1+mod(Cell_ID,3)×N
Dec
More than various in, N
tBe the number of transmit antennas of described dispensing device configuration, n
t=1,2 ..., N
tBe the transmitting antenna sequence number.
12. the generation of a wireless channel measurement reference signal and dispensing device comprise that subsequence provides module, are used to provide the set of first subsequence
Gather with second subsequence
G
1In comprise M
1Individual length is N
1First subsequence, G
2In comprise M
2Individual length is N
2Second subsequence, m
1=0,1 ..., M
1-1, m
2=0,1 ..., M
2-1, N
SeqBe the length of reference signal sequence, R=N
1/ N
2, N
Seq, N
1, N
2, R is a natural number, length is represented with bit number;
Subsequence is selected module, is used for selecting one first subsequence from the set of first subsequence
From the set of second subsequence, select one second subsequence
The sequence generation module is used for basis
With
Generate reference signal sequence, have R bit to be in this reference signal sequence i (R+1)~i (R+1)+R bit
The iR~iR+R-1 bit, all the other 1 bits are
I bit, i=0,1 ..., N
2-1, and i is when getting different value, and the relative position of this 1 bit and this R bit is fixed;
The sequence sending module, be used for the reference signal sequence that will generate or the sequence that obtains after this reference signal sequence conversion equally spaced is mapped to all available subcarriers except that the direct current subcarrier on frequency domain, obtain the frequency domain reference signal, send after transforming to time-domain symbol again.
13. generation as claimed in claim 12 and dispensing device is characterized in that:
Described subsequence provides first subsequence that module provides and the length N of second subsequence
1, N
2Value follow following agreement:
Wherein, α
1, β
1, γ
1, α
2, β
2, γ
2〉=0, α
1〉=α
2, and N is arranged
Sc=N
Dec* N
Seq+ N
0, N
ScBe the subcarrier number that reference signal sequence can be used, N
DecBe natural number, the placement interval of expression reference signal when frequency domain is uniformly-spaced placed, N
0Be integer, 0≤N
0<N
Dec
Described sequence generation module basis
With
Generate reference signal sequence
The time formula as follows:
Wherein, L=R+1, m=0,1 ..., N
Seq-1, m
0Be integer, and m
0=0, R or R/2, subscript g (m
1, m
2) be m
1, m
2Function, mod (x, y)=xmody, the expression modular arithmetic.
14. generation as claimed in claim 13 and dispensing device is characterized in that:
Described subsequence selects module to select from set of first subsequence and the set of second subsequence according to following formula
With
m
1=Cell_ID
b(m′:1),m
2=Cell_ID
b(m″:m′+1)
Wherein, Cell_ID
bBe the binary representation of Cell_ID, described g (m
1, m
2) equaling Cell_ID, Cell_ID is the sequence number of base station, sector or sub-district, Cell_ID
b(m ': 1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM ' to the 1st, Cell_ID
b(m ": m '+1) the order intercepting binary number Cell_ID of big-endian is pressed in expression
bM " to m '+1, m ', m " being natural number, m '<m ", M
1=2
M ', M
2=2
M " m '
15., it is characterized in that as claim 12 or 13 or 14 described generation and dispensing devices:
Described sequence sending module is mapped to reference signal sequence by following formula the subcarrier of the symbol correspondence that is used for transmission of reference signals:
Wherein, k is the subcarrier sequence number, and S (k) expression reference signal sequence is mapped to k the data on the subcarrier,
Expression is not more than the maximum integer of x, k
0Be integer, expression is used for the sequence number of first subcarrier of transmitted reference signal, N
UsedBe the available sub-carrier number that comprises the direct current subcarrier, Cell_ID is the sequence number of base station, sector or sub-district, k
0A kind of in the following manner comes value:
First kind, k
0=n
t-1;
Second kind, k
0For satisfying the value of following two conditions:
Wherein, k
0=0,1 ..., 8, n is a frame number, BRO (x, 3) is the inverted order of 3 bit x;
The third, k
0For satisfying the value of following condition:
k
0=n
t-1+mod(Cell_ID,3)×N
Dec
More than various in, N
tBe the number of transmit antennas of described dispensing device configuration, n
t=1,2 ..., N
tBe the transmitting antenna sequence number.
16., it is characterized in that as claim 12 or 13 or 14 described generation and dispensing devices:
First subsequence and second subsequence that described subsequence provides module to provide are the Golay complementary series; Described sequence sending module sends described reference signal sequence as middle pilot tone or Sounding signal.
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CN102355442A (en) * | 2011-06-29 | 2012-02-15 | 合肥东芯通信股份有限公司 | Method and device for generating UE-RS (user equipment-specific reference signals) in LTE (long term evolution) system |
WO2014106317A1 (en) * | 2013-01-04 | 2014-07-10 | 富士通株式会社 | Method for channel measurement, configuration method and apparatus for channel measurement |
CN104854898A (en) * | 2013-01-04 | 2015-08-19 | 富士通株式会社 | Method for channel measurement, configuration method and apparatus for channel measurement |
CN110036589A (en) * | 2016-09-30 | 2019-07-19 | 瑞典爱立信有限公司 | The effective uplink DMRS sequence of power and resource for IFDMA |
US11689331B2 (en) | 2016-09-30 | 2023-06-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Power and resource efficient uplink DMRS sequences for IFDMA |
CN110999244A (en) * | 2017-08-11 | 2020-04-10 | 华为技术有限公司 | Signal processing method and device based on sequence |
CN113056884B (en) * | 2018-11-02 | 2023-03-24 | 中兴通讯股份有限公司 | Generating sequences of reference signals |
US11985088B2 (en) | 2018-11-02 | 2024-05-14 | Zte Corporation | Generating sequences for reference signals |
CN113056884A (en) * | 2018-11-02 | 2021-06-29 | 中兴通讯股份有限公司 | Generating a sequence of reference signals |
CN111555848A (en) * | 2019-02-11 | 2020-08-18 | 中国移动通信有限公司研究院 | Reference signal transmission method and communication equipment |
CN111865517B (en) * | 2019-04-25 | 2022-06-14 | 华为技术有限公司 | Method and device for transmitting reference signal |
CN111865517A (en) * | 2019-04-25 | 2020-10-30 | 华为技术有限公司 | Method and device for transmitting reference signal |
WO2022257572A1 (en) * | 2021-06-10 | 2022-12-15 | 华为技术有限公司 | Methods for transmitting and receiving reference signal, and apparatus |
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CN102026219B (en) | 2013-06-12 |
WO2011035517A1 (en) | 2011-03-31 |
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