CN102238565A - Channel sounding method and device - Google Patents
Channel sounding method and device Download PDFInfo
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- CN102238565A CN102238565A CN2010101734019A CN201010173401A CN102238565A CN 102238565 A CN102238565 A CN 102238565A CN 2010101734019 A CN2010101734019 A CN 2010101734019A CN 201010173401 A CN201010173401 A CN 201010173401A CN 102238565 A CN102238565 A CN 102238565A
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Abstract
The invention discloses a channel sounding method and device belonging to the field of communication. The method comprises the steps as follows: a base station sets different shift values for different cells so as to ensure the cross correlation between the sounding signal of any user in the current cell and the sounding signal of any user in the neighbor cell to be lower than a threshold value, thus achieving the aim of reducing mutual interference of the sounding signals among different users; the base station determines a Golay sequence corresponding to any user in the current cell according to the shift value of the current cell; and the user in the current cell is notified to use the determined Golay sequence to carry out channel sounding. By using the method and device, the interference among the sounding signals can be suppressed.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of channel detection method and apparatus based on wimax 802.16e agreement.
Background technology
Smart antenna is a kind of intelligentized antenna form, and its intellectuality is embodied on the self adaptation, and this adaptive aerial array is made up of a plurality of antenna elements.
For the smart antenna of base station end, handle the upward signal that every antenna receives the base station, draws a weight coefficient; When each root antenna carries out the downstream signal emission, will multiply by the weight coefficient of this antenna correspondence, be used to regulate the amplitude and the phase place that transmit.Thus, smart antenna can measure the user side to, regulate the weighted amplitude of each array element signals and the antenna pattern that phase place changes array adaptively, realize that wave beam moves along with moving of user, reduce signal transmission power, extending battery life, and the volume that reduces subscriber equipment, or under the prerequisite that does not reduce transmitting power, increase the coverage rate of base station greatly.
The final purpose of smart antenna is to realize down beam shaping (Beam Forming, BF), in Wimax TDD system, because the reciprocity of up-downgoing channel, promptly be similar to and think that the up-downgoing channel condition is the same, the angle information of down beam shaping can be by drawing the up parsing that transmits.Can be divided into open loop BF and closed loop BF according to weights acquisition methods difference.Open loop BF makes up covariance matrix by user uplink data piece (Burst) or FFB subchannel are carried out channel estimating, obtains the weights of every antenna.Closed loop BF claims to survey BF (Sounding BF) again, and terminal sends on the specific subcarrier of specific symbol surveys (Sounding) sequence, is used to carry out channel detection, and the base station obtains weights by separating detection (Sounding) sequence.
Under the situation of identical networking, because the particularity of the detection of up link (Sounding) signal, need to consider to eliminate detection (Sounding) the signal phase mutual interference of up link between each sub-district, the Gray Golay sequence characteristic that uses according to detection (Sounding) signal of up link, and agreement is according to the relevant anti-interference strategy of Cyclic and Decimation sequence characteristic definition, and needs are respectively to Cyclic and the Decimation sequence analysis of Sounding.
The detection of up link (Sounding) signal also is ascending channel detecting signal (Channel Sounding), it is the reciprocity of utilizing the up-downgoing channel of TDD system, to a kind of means that BS provides channel response information (or channel condition information CSI), be mainly used in the TDD system by SS.
The Sounding signal is divided into Cyclic sequence and Decimation sequence, in same sub-district, interference under the Cyclic mode between the user suppresses to divide realization by sign indicating number, be that user's all subcarriers on 1 symbol send Sounding sequences, the difference of n value has guaranteed to have orthogonality between user's the Sounding sequence; The user is by sending the Sounding sequence to eliminate the interference between the user, i.e. frequency division mode under the Decimation mode at diverse location on the symbol.But, iff according to method on the 802.16e agreement, the different U value of meaning is selected for a post in each sector, it is all undesirable that this dual mode suppresses effects of jamming.
Summary of the invention
Main purpose of the present invention is to provide a kind of channel detection method and apparatus, to address the above problem at least.
According to an aspect of the present invention, a kind of channel detection method is provided, comprise: for different sub-districts, the base station is provided with different shift values, so that the cross correlation of any one user's of current area detectable signal and any one user's of neighbor cell detectable signal is lower than threshold value; Gray's sequence of any user's correspondence of current area is determined in the base station according to the shift value of current area; The user of notice current area uses definite Gray's sequence to carry out channel detection.
According to a further aspect in the invention, a kind of channel detection device is provided, comprise: shift value is provided with module, be used for for different sub-districts, different shift values is set, so that the cross correlation of any one user's of current area detectable signal and any one user's of neighbor cell detectable signal is lower than threshold value; The sequence determination module is used for determining according to the shift value of described current area Gray's sequence of any user's correspondence of described current area; The channel detection notification module is used to notify the user of described current area to use definite Gray's sequence to carry out channel detection.
By the present invention, adopt and carry out the cross correlation computing according to shift value, and then Gray's sequence of definite user use, solve the problem that has interference between detectable signal, and then reached inhibition detectable signal effects of jamming.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the channel detection method flow diagram according to the embodiment of the invention one;
Fig. 2 is the method flow diagram of selecting according to parameter between the neighbor cell of the embodiment of the invention two;
Fig. 3 is the method flow diagram of selecting according to parameter between the neighbor cell of the embodiment of the invention three;
Fig. 4 is the shift value schematic diagram of distributing to homogeneous frequency adjacent area according to the embodiment of the invention four; And
Fig. 5 is the channel detection apparatus structure block diagram according to the embodiment of the invention five.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Communication system in the embodiment of the invention comprises base station and subscriber equipment, carry out definite operation of the golay sequence of detectable signal use by the base station, the user that can be notified to respective cell behind the determining of golay sequence is finished in the base station, and the user of respective cell carries out the transmission of detectable signal according to the golay sequence in the notice.
Embodiment one
Present embodiment provides a kind of channel detection method, and referring to Fig. 1, this method may further comprise the steps:
Step S102, for different sub-districts, the base station is provided with different shift values, so that the cross correlation of any one user's of current area detectable signal and any one user's of neighbor cell detectable signal is lower than threshold value, reaches the purpose that reduces detectable signal phase mutual interference between different user;
For example, the set to be selected of current area shift value is determined according to the shift value of neighbor cell in the base station, treats the golay sequence of any user in the corresponding golay sequence of selected works each value in closing and the neighbor cell and carries out the cross correlation computing; The value that is lower than threshold value in the operation result of taking-up cross correlation computing from set to be selected is chosen the shift value of a value as current area as current set to be selected from current set to be selected.
Wherein, set to be selected can be will be predetermined shift value (for example value of stipulating in the related protocol) set in remove the set of remaining value behind the shift value of neighbor cell.
Step S104, Gray (golay) sequence of any user's correspondence of current area is determined in the base station according to the shift value of current area;
When determining the golay sequence, can determine that detectable signal is divided into according to the type of detectable signal: first sequence (being the Cyclic sequence) and second sequence (being the Decimation sequence) are described respectively below.
When detectable signal is the Cyclic sequence, the golay sequence of determining any user's correspondence of current area comprises: to each user in the current area, first value beginning from set to be selected, the cyclic shift index n of each value in the set to be selected and largest loop displacement index P and appointment is made up, obtain multiple combination, determine corresponding Golay sequence according to each combination in the multiple combination successively, when determining the Golay sequence, the n that each user selects in the current area is different; The Golay sequence of all users in definite Golay sequence and the neighbor cell is carried out the cross correlation computing, from set to be selected, be lower than the value of threshold value in the operation result of taking-up cross correlation computing, u, the P that explanation is the active user with corresponding u, P of this value and n value and the cross correlation of n value and neighbor cell are smaller, with this value correspondence the golay sequence to carry out the interference of channel detection less.
Detectable signal is the Decimation sequence, the golay sequence of determining any user's correspondence of current area comprises: to each user in the current area, first value beginning from set to be selected, value D and actual shifts g in each value in the set to be selected probe instructions corresponding with described second sequence make up, obtain multiple combination, determine corresponding Golay sequence according to each combination in the multiple combination successively; When determining described Golay sequence, the g that each user selects in the current area is different; The Golay sequence of all users in definite Golay sequence and the neighbor cell is carried out the cross correlation computing, from set to be selected, be lower than the value of threshold value in the operation result of taking-up cross correlation computing, u, the D that explanation is the active user with corresponding u, P of this value and n value and the cross correlation of g value and neighbor cell are smaller, with this value correspondence the golay sequence to carry out the interference of channel detection less.
Step S106, the user of notice current area uses definite Gray's sequence to carry out channel detection.
After the user of current area is notified, can use the golay sequence of determining in the notice to carry out channel detection, such channel detection minizone and the signal in the sub-district disturb smaller, reach and suppress the purpose that detectable signal disturbs.
Embodiment two
The notice terminal is used Cyclic mode, the sequence b that terminal is used when the base station
kAs follows with the contextual definition of index n:
Wherein:
K is the index (0≤k≤N of subcarrier
Used-1);
N
UsedIt is subcarrier useful in the Sounding sequence;
G (x) is the Golay sequence, sees the 8.4.6.2.7 joint table 464 of P80216Rev2_D9 agreement for details;
P is a largest loop displacement index, and its value can be 4 or 8;
N is the cyclic shift index of appointment, its scope from 0 to P-1;
B is the subcarrier/frequency band group according to the Sounding command assignment;
U is PAPR reduction, the shift value that defines among safety zone and the sounding zone IE, and its value can be 0-127;
Fft is the FFT size;
Offset
DSkew when (fft) specifying a FFT, the 8.4.6.2.7 joint table 465 of P80216Rev2_D9 agreement;
Table 465
| FFT length | Side-play amount offset | PAPR |
| 2048 | 30 | 6.3 |
| 1024 | 60 | 6.1 |
| 512 | 542 | 5.8 |
| 128 | 859 | 5.1 |
This sequence send mode all sends the cyclic sequence for each user on the individual subcarrier of 432 (5M systems).
By above formula as can be known, the golay sequence that detectable signal uses is determined by following 4 factors, is respectively FFT, P, n, u, is described in the cyclic mode below.
The cyclic mode, count and P value and u value equate for each user with the FFT in the sub-district, user's difference is to adopt different n values, the difference of n value has guaranteed to have orthogonality between user's the detectable signal, therefore, in the sub-district,, can guarantee that the interference between the user is minimum to distributing different n values between the user.
It all might be different for each user that FFT between neighbor cell counts with P value and n value, can only rely on different u values to determine to have the detectable signal of lower cross correlation.
Suppose that FFT counts and P value is all fixed, under the equal or situation about not waiting of n value, all need to travel through the value of u, search for the less combined sequence of mutual property.With FFT=512 and 1024, and the situation that the P value of neighbor cell equates is example, during as P=4, referring to Fig. 2, is the method flow diagram that parameter is selected between neighbor cell, and this method comprises:
Step S202 determines the P value;
Step S204 according to the P value, determines the combination of n1 and n2;
For n1*n2, be example with P=4:
n1*n2＝1?2 3 4
5?6 7 8
9?10?11?12
13?14?15?16
Index 1 is n1=0, n2=0, and index 2 is n1=1, n2=0, and the like, index 16 is n1=3, n2=3.Therefore for the element traversal of matrix n1*n2, need relatively all P*P kind situations;
Step S206 under the combination condition of every kind of n1 and n2, determines the matrix of u1*u2;
For u1*u2, can remove the part that repeats comparison, and remove triangular portions under the matrix, to reduce number of times relatively.
u1*u2＝1 2 3 4······128
129?130?131?132····256
.....
128*127+1?128*127+2···········128*128
Step S208 asks the average I of all elements in the u1*u2 matrix
1, i=1;
Step S210 takes out in the u1*u2 matrix less than average I
iAll elements;
Step S212, i=i+1 calculates next average I to the element that takes out
i
Step S214 judges average I
iWhether equal average I
I+1, if, execution in step S216, if not, execution in step S210;
As average I
iEqual average I
I+1The time, average I is described
I+1For stablizing average;
Step S216 writes down in the u1*u2 matrix less than average I
I+1The position of all elements;
During element (this element is the absolute value of b1 and b2 cross-correlation) in traversal u1*u2 matrix, element in the matrix is averaged, element greater than average is carried out mark, do not participate in the calculating of average next time, pass through the iteration of several times like this, all value stabilization takes out the matrix element position that is lower than average, is the lower combination of cross correlation between the sounding sequence.
Step S218, whether the combination of judging n1 and n2 travels through and finishes, if, finish current flow process, otherwise, step S204 returned.
Present embodiment is with the golay sequence of u, P and the definite active user's correspondence of n value, and golay sequence of determining and any user's of neighbor cell interference minimum, and the interference when this current user uses this golay sequence to carry out channel detection is less.
Embodiment three
The notice terminal is used Decimated mode, the sequence b that terminal is used when the base station
kAs follows with the contextual definition of index n:
Wherein:
K is the index (0≤k≤N of subcarrier
Used-1);
G (x) is the Golay sequence, sees the 8.4.6.2.7 joint table 464 of P80216Rev2D9 agreement for details;
Fft is the FFT size;
U is a shift value; This shift value can be PAPR reduction, the value that defines among safety zone and the sounding zone IE;
Offset
DSkew when (fft) specifying a FFT sees above-mentioned table 465 for details;
B is the subcarrier/frequency band group of distributing according to probe instructions;
D is the decimation parameter that comes from probe instructions;
G is actual decimation skew, k mod D=g.
By above formula as can be known, the golay sequence that detectable signal uses is determined by following 4 factors, is respectively FFT, D, g, u, is described in the Decimation mode below.
Referring to Fig. 3, be the method flow diagram that parameter between neighbor cell is selected, this method comprises:
Step S302 judges whether the D value is fixing, if unfixing, execution in step S3021; If fixing, execution in step S3031;
Step S3021, the D value fixedly the time, can not have different values, and the value of D is set;
Step S3022 according to the value of current D, determines the combination (getting the combination on the diagonal) of g1 and g2;
Step S3023 carries out the traversal of u1 and u2, gets the upper triangular matrix element of u1*u2 matrix;
u1*u2＝1?2?3?4······128
129?130?131?132····256
.....
128*127+1128*127+2···········128*128
Step S3024, in the record u1*u2 matrix less than the position of all elements of average, the average here is the stable average of u1*u2 matrix element, and step S210 is identical to the process of step S214 in definite process of this stable average and the said method, no longer describes in detail here;
Step S3025, whether the combination of judging g1 and g2 travels through and finishes, if, execution in step S3026, otherwise, step S3022 returned;
Step S3026, whether the combination of judging D1 and D2 travels through and finishes, if, finish, otherwise, step S3021 returned;
For each sub-district, the D value can elect 8,16 or 32 as, so combination is the 3*3 kind;
Step S3031, the D value is fixing, determines the combination of current D1 and D2;
Step S3032 according to the value of current D, determines the combination (getting the combination on the diagonal) of g1 and g2;
Step S3033 carries out the traversal of u1 and u2, gets the upper triangular matrix element of u1*u2 matrix;
Step S3034, less than the position of all elements of average, the average here is the stable average of u1*u2 matrix element among the record u1*u2, step S210 is identical to the process of step S214 in definite process of this stable average and the said method, here detailed description no longer;
Step S3035, whether the combination of judging g1 and g2 travels through and finishes, if, execution in step S3036, otherwise, step S3032 returned;
Step S3036, whether the combination of judging D1 and D2 travels through and finishes, if, finish, otherwise, step S3031 returned.
By said method as can be known, D is fixing, and the number of times of traversal is few, the unfixed words of D, and traversal is often.
Illustrate as follows: D=2,
G＝g1*g2＝2*2
＝1?2
3?4
The same with sub-district u value, therefore if g value equate, then be the interference of minizone certainly, therefore, in order to suppress to disturb, need not consider with the user of sub-district how u value is chosen, maintenance g value difference gets final product; The minizone, the g value is different, certainly quadrature; The g value is identical, distinguishes the user with the u value.
Said process is as shown in the table:
| ?G | g1 | g2 | Select suitable k1 and k2, k1=? k2 | The cross correlation of u1*u2 (removing triangle battle array and diagonal down) |
| ?1 | 0 | 0 | K provides the length of sequence, k1=k2 | Get the lower sequence of cross correlation according to u, reduce the interference between two sequences, but can not guarantee that the subcarrier correspondence position is noiseless |
| ?4 | 1 | 1 | k1＝k2 | The same |
| ?2 | 0 | 1 | Two sequences can quadrature | |
| ?3 | 1 | 0 | In fact be same situation with G=2 |
In the sub-district, take the subcarrier of diverse location between the user, will can not form interference, interference if take the subcarrier of same position, can be introduced between the user in the minizone.
Not fixedly the time, illustrate that two users' detectable signal is selected different D1 and D2 respectively for the D value, therefore, this situation is an interference among adjacent cells.Example: D1=2, D2=4; G1=0-1, g2=0-3;
G＝g1*g2＝2*4＝【1?2?3?4?5?6?7?8】
＝1?2?3?4
5?6?7?8
If the D value is unequal, then is two sub-districts certainly, at this moment, the u value can be identical or different;
G=1 or 6 shows that the g value equates, promptly during G=1, and g1=g2=0, during G=6, g1=g2=1, in the case, the golay sequence guarantees the orthogonality between the sequence by the difference of u value.
G=3 or 8, or other value except that 1 and 6, this moment, the g value was unequal, also needed to consider u value factor;
Other situation, the g value is unequal, can guarantee corresponding sub-carrier positions quadrature, need not consider the value of u.
Analyze G=1,6 and 3,8;
For example, g1=0, g2=0, k mod D=g like this;
k1＝[1?3?5?7?9?11?13......]
k2＝[1?5?9?13.....]
At this moment, only consider the element of k1 (i)=k2 (j), i.e. the sequence of k2 length and position;
At FFT=128:
The golay sequence needs mould 2048, offset=859, k ∈ (1: 108), traversal u (0--127);
(1) obtains k2
K2=[1 59 13.....], have 27 values altogether;
(2) traversal u
b1＝G([k2+u+offset]mod?2048)
b2＝G([k2+u+offset]mod?2048)
(3) cross correlation of investigation b1 and b2 is found out lower u1 of cross correlation and u2 combination.
The minizone, the D value is unequal, and the user might take the subcarrier of same position, and interference is arranged, the minizone, the D value is unequal, and the user might take the subcarrier of diverse location, and is noiseless.
Present embodiment is with the golay sequence of u, D and the definite active user's correspondence of g value, and golay sequence of determining and any user's of neighbor cell interference minimum, and the interference when this current user uses this golay sequence to carry out channel detection is less.
The foregoing description two and three is by u value, offset
D(fft) and k=0, obtain the 0th subcarrier and should get certain bit of Golay sequence.From this bit, take out the data of 432 bit continuously;
The Cyclic mode, be the position of these 432 data being filled out 0-431 useful subcarrier of correspondence, suppose P=4, all have 4 users and send same sequence on these 432 subcarriers, how could distinguish that user's sequence? because of having taken advantage of one in the back in cyclic formula the inside
For P=4, n can get 0-3, that is to say, the cyclic formula is taken advantage of later
Send out sequence though can guarantee 4 users in same position, their sequence is a quadrature, does not promptly have interference mutually.
The Decimation mode, the golay sequence of having taken out 432bit, golay sequence and subcarrier are corresponding one by one, suppose D=4, and 4 users then can be arranged, and the meaning of k mod D=g is as follows:
For the 0th subcarrier, 0mod 4=0, that is, the user that the 0th sequence that subcarrier is sent out is g=0 sends, the 4th sequence that subcarrier is sent out of 4mod 4=0 user's transmission that is g=0 in like manner;
For the 1st subcarrier, 1mod 4=1, that is, the user that the 1st sequence that subcarrier is sent out is g=1 sends, the 5th sequence that subcarrier is sent out of 5mod 4=1 user's transmission that is g=1 in like manner;
For the 2nd subcarrier, 2mod 4=2, that is, the user that the 2nd sequence that subcarrier is sent out is g=1 sends, the 6th sequence that subcarrier is sent out of 6mod 4=2 user's transmission that is g=2 in like manner;
For the 3rd subcarrier, 3mod 4=3, that is, the user that the 3rd sequence that subcarrier is sent out is g=3 sends, the 7th sequence that subcarrier is sent out of 7mod 4=3 user's transmission that is g=3 in like manner;
The difference of cyclic and Decimation is, cyclic sends the golay sequence on all useful subcarriers, the sequence that each user sends on same subcarrier is a quadrature, but each user of Decimation sends the golay sequence on the position of P subcarrier that is separated by.
Embodiment four
In order to reduce the interference between the detectable signal user, in same cells, the U value is identical between the user, and different P, n value have realized the orthogonality between the user.At neighbor cell, under the situation that P, n value may be identical, reduce interference between the neighbor cell by choosing one group of lower sequence of cross correlation, different districts can only rely on different U values to determine to have the detectable signal sequence of lower cross correlation.
Choose one group of U value, make that the cross correlation of neighbor cell detectable signal is minimum, thereby reduce the inter-user interference of neighbor cell.
The first step: according to the system interference characteristics, set a thresholding, be used to travel through out under institute's noisy condition, the cross-correlation absolute value is less than the combination one to one of this thresholding between the different u value values.
Second step:, select a u1, u2 since first group of u1-＞u2 mapping.
The 3rd step: again from a u2 value, select u2-＞u3, and the optional set of u2-＞u3 must be the subclass of u1-＞u2 set.
The 4th step: again from a u3 value, select u3-＞u4, and the optional set of u3-＞u4 must be the subclass of u2-＞u3 set.
The 5th step: step 3 and four above repeating, up to optional u
n-＞u
N-1Combination has been an empty set.
Referring to Fig. 4, for distributing to the shift value schematic diagram with neighbor cell frequently, the u value of each sub-district is respectively 0,4, and 8,12,16,20,24; In fact can not geographically adjacent sub-district and all use identical networking, like this, the scope of application of these u values will increase greatly.
Distributing the benefit of u value like this is that the correlation between the sequence is lower, help the detection of this cell base station to this users of all cells detectable signal, and the user of the neighbor cell that is subjected to disturbs less.U=0 for example, three sub-districts of 4,8, the cross correlation value absolute value between all users is all less than 9.If adopt other u value, for example: the cross correlation value absolute value between the u=0,1,2, three all users of sub-district will reach more than 200, and this is very disadvantageous for the detectable signal detection.For example the u value is: 0,4,8,12,16,20,24,28,33,91, and the cross correlation value absolute value is all less than 20.
Present embodiment is by determining the U value that use the sub-district can to make the interference of detectable signal drop to minimum one by one in the U value set of regulation.
Base station BS among the above embodiment receives uplink detection signal, obtain up channel response message (or channel condition information CSI) according to this user's detectable signal, utilize TDD system up-downgoing channel reciprocity, use BF (TXAA/MRT/EBF), SDMA (SpatialDivision Multiple Access, the spatial reuse multichannel inserts), many antennas such as CL-MIMO lift-off technology carries out this user's downlink data emission, improves power system capacity and signal quality.
Embodiment five
Referring to Fig. 5, present embodiment provides a kind of channel detection device, and this device can be arranged on the base station, and this device comprises:
Shift value is provided with module 50, is used for for different sub-districts different shift values being set, so that the cross correlation of any one user's of current area detectable signal and any one user's of neighbor cell detectable signal is lower than threshold value;
Channel detection notification module 54 is used to notify the user of current area to use definite golay sequence to carry out channel detection.
Preferably, shift value is provided with module 50 and comprises:
The cross correlation arithmetic element is used for determining according to the shift value of neighbor cell the set to be selected of current area shift value, treats the golay sequence of any user in the corresponding golay sequence of selected works each value in closing and the neighbor cell and carries out the cross correlation computing; The shift value determining unit, the value that is used for being lower than threshold value from the operation result of set taking-up cross correlation to be selected computing is chosen the shift value of a value as current area as current set to be selected from current set to be selected.
Wherein, the cross correlation arithmetic element comprises:
Subelement is determined in set to be selected, and remaining value was as set to be selected after the shift value that is used for being scheduled to was gathered the shift value of removing neighbor cell.
The channel detection device of present embodiment possesses the function of the base station among the embodiment one to three, can carry out in golay sequence that the selection of each parameter obtains and the neighbor cell interference minimum of the golay sequence that user arbitrarily uses, reach and suppress the detectable signal effects of jamming.
As can be seen from the above description, the present invention has realized following technique effect: by considering the selection of each parameter, make in the golay sequence that obtains and the neighbor cell interference minimum of the golay sequence that user arbitrarily uses, reached inhibition detectable signal effects of jamming.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a channel detection method is characterized in that, comprising:
For different sub-districts, the base station is provided with different shift values, so that the cross correlation of any one user's of current area detectable signal and any one user's of neighbor cell detectable signal is lower than threshold value;
Gray's sequence of any user's correspondence of described current area is determined in described base station according to the shift value of described current area;
Notify the user of described current area to use definite Gray's sequence to carry out channel detection.
2. method according to claim 1 is characterized in that, the shift value that the base station is provided with current area comprises:
The set to be selected of current area shift value is determined according to the shift value of neighbor cell in the base station, and the Gray's sequence of any user in the corresponding Gray's sequence of each value in the described set to be selected and the described neighbor cell is carried out the cross correlation computing;
The value that is lower than threshold value in the operation result of taking-up cross correlation computing from described set to be selected is chosen the shift value of a value as current area as current set to be selected from described current set to be selected.
3. method according to claim 2 is characterized in that, determines that according to the shift value of neighbor cell the set to be selected of current area shift value comprises:
With remaining value after removing the shift value of described neighbor cell in the predetermined shift value set as set to be selected.
4. method according to claim 2 is characterized in that, described detectable signal is first sequence, the Gray's sequence of any user in the corresponding Gray's sequence of each value in the described set to be selected and the described neighbor cell is carried out the cross correlation computing comprise:
To each user in the described current area, first value beginning from described set to be selected, the cyclic shift index n of each value in the described set to be selected and largest loop displacement index P and appointment is made up, obtain multiple combination, determine corresponding Gray's sequence according to each combination in the described multiple combination successively, when determining described Gray's sequence, the described n that each user selects in the described current area is different;
The Gray's sequence of all users in definite Gray's sequence and the described neighbor cell is carried out the cross correlation computing.
5. method according to claim 4 is characterized in that, determines that according to each combination in the described multiple combination corresponding Gray's sequence comprises successively:
For described first sequence, sequence b
kWith the pass of described each combination be:
Wherein:
K is the index (0≤k≤N of subcarrier
Used-1);
N
UsedIt is the subcarrier that is in enabled state in the described detectable signal;
G (x) is Gray's sequence;
P is a largest loop displacement index;
N is the cyclic shift index of appointment, its value from 0 to P-1;
B is the subcarrier/frequency band group of distributing according to probe instructions;
U is current shift value;
Fft is a fast Fourier transform FFT size;
Offset
D(fft) be the skew of described FFT correspondence.
6. method according to claim 2 is characterized in that, described detectable signal is second sequence, the Gray's sequence of any user in the corresponding Gray's sequence of each value in the described set to be selected and the described neighbor cell is carried out the cross correlation computing comprise:
To each user in the described current area, first value beginning from described set to be selected, value D and actual shifts g in each value in the described set to be selected probe instructions corresponding with described second sequence make up, obtain multiple combination, determine corresponding Gray's sequence according to each combination in the described multiple combination successively; When determining described Gray's sequence, the described g that each user selects in the described current area is different;
The Gray's sequence of all users in definite Gray's sequence and the described neighbor cell is carried out the cross correlation computing.
7. method according to claim 6 is characterized in that, determines that according to each combination in the described multiple combination corresponding Gray's sequence comprises successively:
For described second sequence, sequence b
kWith the pass of described each combination be:
Wherein:
K is the index (0≤k≤N of subcarrier
Used-1);
G (x) is Gray's sequence;
Fft is the FFT size;
U is current shift value;
Offset
D(fft) be the skew of described FFT correspondence;
B is the subcarrier/frequency band group of distributing according to probe instructions;
D is described second sequential parameter that comes from described probe instructions;
G is actual described second sequence offset.
8. a channel detection device is characterized in that, comprising:
Shift value is provided with module, is used for for different sub-districts different shift values being set, so that the cross correlation of any one user's of current area detectable signal and any one user's of neighbor cell detectable signal is lower than threshold value;
The sequence determination module is used for determining according to the shift value of described current area Gray's sequence of any user's correspondence of described current area;
The channel detection notification module is used to notify the user of described current area to use definite Gray's sequence to carry out channel detection.
9. device according to claim 8 is characterized in that, described shift value is provided with module and comprises:
The cross correlation arithmetic element, be used for determining the set to be selected of current area shift value, the Gray's sequence of any user in the corresponding Gray's sequence of each value in the described set to be selected and the described neighbor cell is carried out the cross correlation computing according to the shift value of neighbor cell;
The shift value determining unit, the value that is used for being lower than threshold value from the operation result of described set taking-up cross correlation to be selected computing is chosen the shift value of a value as current area as current set to be selected from described current set to be selected.
10. device according to claim 9 is characterized in that, described cross correlation arithmetic element comprises:
Subelement is determined in set to be selected, and remaining value was as set to be selected after the shift value that is used for being scheduled to was gathered the shift value of removing described neighbor cell.
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| CN2010101734019A CN102238565A (en) | 2010-05-06 | 2010-05-06 | Channel sounding method and device |
| PCT/CN2010/077653 WO2011137630A1 (en) | 2010-05-06 | 2010-10-11 | Method and device for channel sounding |
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| CN2010101734019A CN102238565A (en) | 2010-05-06 | 2010-05-06 | Channel sounding method and device |
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| WO2011137630A1 (en) | 2011-11-10 |
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