CN102938745B - Wireless communications method - Google Patents
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- CN102938745B CN102938745B CN201210457892.9A CN201210457892A CN102938745B CN 102938745 B CN102938745 B CN 102938745B CN 201210457892 A CN201210457892 A CN 201210457892A CN 102938745 B CN102938745 B CN 102938745B
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Abstract
The present invention provides a kind of wireless communications method, the data of the 1st and the 2nd user are sent using the 1st and the 2nd subcarrier group respectively, it is transmitted for the pilot signal of the data-reusing the 1st and the 2nd user, the wireless communications method is characterised by, the pilot signal for the 1st and the 2nd user for applying cyclic shift to Zadoff Chu sequences respectively and generating is configured at different frequency, the pilot signal of the 1st and the 2nd user is directed to respectively, so that the subcarrier of more than 1 for sending the high frequency band side of frequency band is equal with the frequency component of the subcarrier of more than 1 of low-frequency band side.
Description
It is on December 22nd, 2006 applying date that the application, which is, and Application No. 200680056539.2 is entitled " wireless
The divisional application of the application for a patent for invention of communication means and base station and user terminal ".
Technical field
The present invention relates to wireless communications method and base station and user terminal, more particularly in following wireless communication system
Wireless communications method and base station and user terminal：Each user terminal uses the mutually different data distributed by base station to send frequency
The frequency of band sends data-signal to the base station, while for data-signal time division multiplexed pilots signal and being sent to the base station.
Background technology
In the wireless communication system of cellular system etc., typically it is timed together using known pilot signal in receiving side
Step and transmission path estimation（Channel estimation）, and the demodulation of data is carried out accordingly.Also, by according to channel quality come adaptive
Ground is answered to change in the adaptive modulation system to improve handling capacity such as modulation system and encoding rate, in order to determine optimal modulation methods
Formula and optimal encoding rate, in estimation channel quality, such as signal to noise ratio SIR（Signal toInterference Ratio）Deng
When also use pilot signal.
There is OFDM as the stronger accessing wirelessly mode of mitigating frequency-selective fading（Orthogonal
FrequencyDivision Multiplexing, OFDM）Mode, the frequency selective fading is because of wide band
Multipath in radio communication.But, there is the PAPR for sending signal in OFDM（Peak to Average Ratio, the equal power in peak
Than）Larger the problem of, up-link transmission means is not suitable as from the viewpoint of the power efficiency of terminal.Therefore,
During the cellular system in two generations is 3GPP LTE, up-link transmission means is to carry out single carrier transmission, and line frequency is entered in receiving side
Deng change（Non-patent literature 1）.Single carrier transmission means that only multiplexing sends data and pilot signal on a timeline, and in frequency
Multiplex data is compared with the OFDM of pilot signal on axle, can significantly reduce PAPR.
Single carrier transmission
Figure 23 is the frame format example of single carrier transmission, and Figure 24 is the explanation figure of the changes such as frequency.Frame is by respectively by N samples
What data Data and pilot tone the Pilot time division multiplexing of composition were constituted, in fig 23, two pilot blocks are inserted in 1 frame.In frequency
During Deng changing, the mask data Data of data/pilot separation unit 1 and pilot tone Pilot, the first FFT portions 2 implement at FFT to N sample datas
Reason, produces N number of frequency component and input channel compensation section 3.2nd FFT portions 4 implement FFT processing to N samples pilot tone, produce N number of
Frequency component, channel estimation unit 5 is believed each Frequency Estimation using N number of frequency component of the N number of frequency component and known pilot
Road characteristic, by channel compensation signal input channel compensation section 3.Channel compensation portion 3 is for each frequency to defeated from the first FFT portions 2
The N number of frequency component gone out is multiplied by channel compensation signal to carry out channel compensation, N number of frequency that 6 pairs of IFFT Department is implemented after channel compensation
Rate component implements IFFT processing, and is converted to time signal to export.
CAZAC sequences
In single carrier transmission, when entering line frequency etc. in receiving side and changing, in order to accurately be carried out in frequency field
Channel estimation, it is desirable to which pilot signal is uniform amplitude in frequency field, in other words, it is desirable to arbitrary periodicity time shift from phase
Close as 0.On the other hand, from the viewpoint of PAPR, it is desirable to be also uniform amplitude in the time domain.As realizing leading for these characteristics
Frequency sequence has CAZAC（Constant Amplitude Zero Auto Correlation, constant amplitude zero auto-correlation）Sequence,
Provide that being applicable the CAZAC sequences is used as uplink pilot in 3GPP LTE.CAZAC sequences have preferable autocorrelation,
So the amount obtained by identical sequence cyclic shift is mutually orthogonal.In 3GPP LTE, different using cyclic shift amount
CAZAC sequences are multiplexed the pilot signal of different user or the method for the pilot signal by same subscriber multiplexing different antennae is referred to as
CDM（Code Division Multiplex, CDMA）.
Formula is utilized as the Zadoff-Chu sequence of representational CAZAC sequences（1）Represent（Non-patent literature 2）.
ZCk(n)=exp {-j2 π k/L (qn+n (n+L%2)/2) } (1)
Wherein, k and L are relatively prime, and sequence number, sequence length are represented respectively.N represents code number, and q represents arbitrary integer, L%2 tables
Show the remainder for obtaining L divided by 2, Lmod is also expressed as sometimes（2）.It is being following formula L prime factor exploded representation（2）When（gi
For prime number）,
With number φs of the L for natural number small relatively prime ratio L（L）I.e. the sequence number of CAZAC sequences is by following formula（3）Obtain.
Specifically, if L=12, L=12=22×31, so g1=2, e1=2, g2=3, e2=1, according to formula
（3）, the sequence number k of CAZAC sequences is 4.Therefore, L is bigger and prime factor is fewer, then sequence number is more.In other words, if L
It is prime number, then the sequence number k of CAZAC sequences is（L-1）.
Make CAZAC sequences ZCk（n）The ZC that cyclic shift c is obtainedk（N-c）Utilize following formula（4）Represent.
ZCk(n-c)=exp {-j2 π k/L (q (n-c)+(n-c) (n-c+L%2)/2) } (4)
Such as following formula（5）It is shown,
ZCk（n）With ZCk（N-c）Degree of correlation R（τ）It is 0 in the point in addition to τ=c, so female to sequence number identical
Sequence ZCk（n）The sequence measured plus different cyclic shifts is orthogonal each other.
When receiving multiple pilot tones after being multiplexed by the CDM based on cyclic shift in wireless base station, pass through and obtain
With the degree of correlation of auxiliary sequence, pilot tone can be demarcated in place of peak from.The interval of cyclic shift is smaller, to multipath and reception
The patience of timing slip is weaker, so the multiplexing number that can be realized has the upper limit.Multiplexing number based on cyclic shift is being set to P
When, distribute to the cyclic shift amount c of p-th of pilot tonepFor example can be according to following formula（6）It is determined that（Non-patent literature 3）.
cp=(p-1) * [L/p], wherein, p=1,, P (6)
As previously described, time division multiplexed pilots and data in 3GPP LTE up-link, and sent out in SC-FDMA modes
Send.Figure 25 is the structure chart of SC-FDMA sending parts, and 7' represents size NTXDFT（Discrete FourierTransformer,
DFT）, 8' represents subcarrier maps portion, and 9' represents size NFFTIDFT portions, 10 represent CP（Cyclic
Prefix, cyclic prefix）Insertion section.In addition, in 3GPPLTE, in order to suppress treating capacity, NFFTBe set to 2 power it is whole
Number, and replace the IDFT after subcarrier maps using IFFT.
To auxiliary sequence ZCk（n）Applying cyclic shift c processing can be carried out before DFT or after IFFT.When in IFFT
Can be with cyclic shift c × N when carrying out afterwardsFFT/NTXIndividual sample.Due to substantially the same processing, so later with DFT
Carry out illustrating in case of cyclic shift processing before.
Problem of the prior art
In order to reduce inter-cell interference, it is necessary to reuse the CAZAC sequences of different sequence numbers in minizone as pilot tone.
Because repeat number is bigger, the distance using mutually homotactic minizone is bigger, so the possibility for producing severe jamming subtracts
It is small.For this reason, it may be necessary to ensure many CAZAC sequences, the Property requirements of CAZAC sequences will make sequence length L turn into larger prime number.Figure
26 be the interference explanation figure of minizone, such as（A）It is shown, when the CAZAC sequence numbers that can be used are 2, make between neighbor cell
With the CAZAC sequences of same sequence number, so producing the severe jamming of pilot tone.Also, such as（B）It is shown, be in CAZAC sequence numbers
It is smaller without using the CAZAC sequences of same sequence number between neighbor cell, but because repeat number is 3 when 3, so using phase
Minizone distance with the CAZAC sequences of sequence number is shorter, and the possibility of interference increases.Such as（C）It is shown, in CAZAC sequences
When number is 7, because repeat number is 7, than larger, so being increased using the minizone distance of the CAZAC sequences of same sequence number, do
The possibility disturbed is gradually reduced.
But, in 3GPP LTE, such as Figure 27（A）It is shown, the occupancy sub-carrier number of data is set to 12 multiple, leading
The subcarrier spacing of frequency is set to 2 times of the subcarrier spacing of data, to improve transmitting efficiency.In this case, in handle
When the sequence length L of CAZAC sequences is set to 6, sequence number k is 2, due to using the CAZAC sequences of same sequence number in neighbor cell
Row, so producing the interference of pilot tone.Also, when sequence length L is set to 5, k is 4, but still smaller, and such as Figure 27
（B）It is shown, the subcarrier for the data that pilot tone is not covered is produced, causes precision of channel estimation to deteriorate.
Accordingly, it is considered to send when make pilot signal transmission band ratio data transmission bandwidth, it can be ensured that fill
The sequence length of foot（3GPP R1-060925, R1-063183）.Figure 28 be this pilot signal multiplexing number be 2 when example.
When sequence length L is set to 12, CAZAC sequences can only take 4, inter-cell interference increase（K=4）.Therefore, sequence length
L is set to prime number 11.When setting L=11,10 CAZAC sequences can be obtained（K=10）, inter-cell interference can be reduced.In addition,
Sequence length L can not be set to more than 13.Its reason is will to produce interference with adjacent frequency band when being set to more than 13.
The pilot signal of different user is multiplexed by the CDM based on cyclic shift.That is, the CAZAC sequences to L=11
Arrange ZCk（n）Implement the pilot tone that the result after cyclic shift c1 is used as user 1, to CAZAC sequences ZCk（n）Implement cyclic shift
Result after c2 is used as the pilot tone of user 2.
But, by L=11 CAZAC sequences ZCk（n）Cyclic shift and to user 1,2 in use, as shown in Figure 28,
In user 1 and user 2, the transmission frequency band of pilot tone is different with the relativeness of the transmission frequency band of data, causes channel estimation essence
Degree is different.That is, the transmission frequency band for sending the deviation pilot tone of frequency band sub-carriers 23,24 of the data of user 2 is caused so that the sub- load
Precision of channel estimation in ripple deteriorates.
In addition, in Figure 28, according to current 3GPP LTE specifications, the son that the subcarrier spacing of pilot tone is set to data is carried
2 times of wave spacing, but also produce above mentioned problem in the rate of change of subcarrier spacing.
Non-patent literature 1：3GPP TR25814-700Figure9.1.1-1
Non-patent literature 2：B.M.Popovic, " Generalized Chirp-Like Polyphase Sequences
WithOptimum Correlation Properties ", IEEE Trans.Info.Theory, Vol.38, pp.1406-
1409,July 1992.
Non-patent literature 3：3GPP R1-060374,“Text Proposal On Uplink Reference
SignalStructure”,TIInstruments
The content of the invention
According to case above, it is an object of the present invention to can accurately carry out deviateing the data that pilot tone sends frequency band
The channel estimation of subcarrier.
Another object of the present invention is to even if to predetermined sequence（Such as CAZAC sequences ZCk（n））Implement different
Result after the cyclic shift of amount is used as the pilot tone for the user to be multiplexed, and also can accurately be allocated to each user's
The channel estimation of subcarrier.
Another object of the present invention is to predetermined CAZAC sequences even if implementing after different amounts of cyclic shift
As a result it is used as the pilot tone for the user to be multiplexed, the pilot tone of each user can be also separated using simple method and channel is carried out and estimated
Meter.
Another object of the present invention is to even the bad user of transmission path situation, can also improve the user's
The precision of channel estimation of data subcarrier.
The present invention provides the wireless communications method and base station and user terminal in wireless communication system, in the radio communication system
In system, the frequency that each user terminal uses the mutually different data distributed from base station to send frequency band sends data to the base station
Signal, while for data-signal, being time-multiplexed to pilot signal and being sent to the base station.
Wireless communications method
The step of wireless communications method of the present invention includes performing following processing：Total data is sent out for each user terminal
A part of frequency band of frequency band is sent to implement frequency deviation, to determine that the pilot tone of user terminal sends frequency band, so that the pilot tone of the user terminal
Send the data transmission frequency band that frequency band covers the user terminal；And for each user terminal, indicating user terminal makes the use
The frequency that family terminal sends frequency band using the pilot tone of the determination carrys out pilot signal transmitted.
The step of instruction step includes performing following processing：For each user terminal, the inclined of the frequency deviation is calculated
The amount of putting and cyclic shift amount corresponding with the multiplexing number of user terminal；And indicating user terminal, make the user terminal by CAZAC
The pilot signal of sequence circulates the cyclic shift amount, while indicating user terminal, makes the user terminal by the pilot signal frequency deviation
The amounts of frequency offset.
Following steps are performed in a base station：When multiplexing reception is to the multiple pilot signals sent from multiple user terminals,
The frequency component of the pilot signal of non-overlapping copies is added；The copy of pilot signal is multiplied by addition result；And copy phase
Multiply result and be converted to time-domain signal, then, the signal section of predesignated subscriber's terminal is separated from the time-domain signal to carry out channel
Estimation.
The step of wireless communications method of the present invention also includes performing following processing：Obtain the transmission path feelings of movement station
Condition；The intermediate frequency band of total frequency band is preferentially distributed, sending frequency band as the data of the user terminal of transmission path situation difference leads to
Know and give the user terminal.Or, the step of wireless communications method of the invention also includes performing following processing：Carry out jump control
System, distributes the intermediate frequency band and edge band of total frequency band, is used as the data transmission frequency band of each user terminal periodically.
Base station
The base station of the present invention has department of resource management, and the department of resource management is directed to each user terminal, and total data is sent
A part of frequency band of frequency band implements frequency deviation, to determine that the pilot tone of user terminal sends frequency band, sends the pilot tone of the user terminal
The data that frequency band covers the user terminal send frequency band, and indicating user terminal, make the user terminal leading using the determination
Take place frequently and send the frequency of frequency band to carry out pilot signal transmitted.
In a base station, the department of resource management has：Cyclic shift amount calculating part, it is directed to each user terminal, calculates
The amount of bias of the frequency deviation and cyclic shift amount corresponding with the multiplexing number of user terminal；And instruction unit, its instruction user end
End, makes the user terminal that the pilot signal of the CAZAC sequences is circulated into the cyclic shift amount, while indicating user terminal, makes
The user terminal is by amounts of frequency offset described in the pilot signal frequency deviation.
Base station also has the channel estimation unit that channel estimation is carried out for each user terminal, and the channel estimation unit has：
Acceptance division, multiple pilot signals that its multiplexing reception is sent from multiple user terminals；Addition portion, it is by the multiple pilot signal
The frequency component of the pilot portion of non-overlapping copies is added；Copy multiplication portion, it is multiplied by the pair of pilot signal to addition result
This；Converter section, its copy multiplied result is converted to time-domain signal；Separation unit, it separates predesignated subscriber from the time-domain signal
The signal section of terminal；And estimator, its this time signal after separating is converted to the signal of frequency field, to be believed
Estimate in road.
The department of resource management obtains the transmission path situation of movement station, preferentially distributes the intermediate frequency band of total frequency band,
Band notification, which is sent, as the data of the user terminal of transmission path situation difference gives the user terminal.Or, the resource management
Portion performs jump control, and the intermediate frequency band and edge band of total frequency band are distributed periodically, the number of each user terminal is used as
According to transmission band.
User terminal
The user terminal of wireless communication system has：Acceptance division, it receives uplink resource information from base station；And lead
Frequency generating unit, it generates pilot tone according to the instruction of the uplink resource information, and the pilot tone generating unit has：CAZAC sequences
Generating unit, it produces the CAZAC sequences with predetermined sequence length and sequence number according to the resource information and is used as pilot signal；The
1 converter section, it is converted to the pilot signal of frequency field as the CAZAC sequences of the pilot signal of time domain；Subcarrier maps
Portion, its frequency deviation information included according to the resource information, the subcarrier components to pilot signal map；2nd conversion
Pilot signal after portion, its implementation subcarrier maps is converted to the signal of time domain；And cyclic shift portion, it is described in progress
Before 1st conversion or after progress the 2nd conversion, the displacement included according to the resource information makes CAZAC sequences
Cyclic shift.
Brief description of the drawings
Fig. 1 is the 1st principle explanatory diagram of the present invention.
Fig. 2 is the 2nd principle explanatory diagram of the present invention.
Fig. 3 is the 3rd principle explanatory diagram of the present invention.
Fig. 4 is to be used to realize d subcarrier of frequency deviation and cyclic shift（c2- s（k,d,L））Sending side pilot tone generation
Processing spec figure.
Fig. 5 is the biasing explanation figure in subcarrier maps portion.
Fig. 6 is the channel estimation process explanation figure of receiving side.
Fig. 7 is the 2nd pilot tone generation processing spec figure.
Fig. 8 is the clone method explanation figure of sending side.
Fig. 9 is the 2nd channel estimation process explanation figure of receiving side.
Figure 10 is frame assumption diagram.
Figure 11 is the explanation figure of pilot separation.
Figure 12 is the 3rd channel estimation process explanation figure of receiving side.
Figure 13 is the structure chart of movement station.
Figure 14 is the structure chart of pilot tone generating unit.
Figure 15 is the structure chart of base station.
Figure 16 is the structure chart of channel estimation unit.
Figure 17 is the channel generating unit and the structure of channel estimation unit for carrying out the 2nd channel generation processing and channel estimation process
Figure.
Figure 18 is the channel generating unit and the structure of channel estimation unit for carrying out the 3rd channel generation processing and channel estimation process
Figure.
Figure 19 is frequency distribution explanation figure when multiplexing number is 4.
Figure 20 is the explanation figure for switching the jump control for distributing to the transmission frequency band of each user to each frame, is odd number
Distribution explanation figure in individual frame.
Figure 21 is the explanation figure for switching the jump control for distributing to the transmission frequency band of each user to each frame, is even number
Distribution explanation figure in individual frame.
Figure 22 is the structure chart of pilot tone generating unit when carrying out jump control.
Figure 23 is the frame format example of single carrier transmission.
Figure 24 is the explanation figure of the changes such as frequency.
Figure 25 is the structure chart of SC-FDMA sending parts.
Figure 26 is the interference explanation figure of minizone.
Figure 27 is that conventional data send frequency band and pilot tone sends the 1st explanation figure of frequency band.
Figure 28 is that conventional data send frequency band and pilot tone sends the 2nd explanation figure of frequency band.
Embodiment
（A）The principle of the present invention
Such as Fig. 1（A）It is shown, to CAZAC sequences ZCk（n）Implement the result after cyclic shift c1 and be used as leading for user 1
Frequently, to CAZAC sequences ZCk（n）When implementing pilot tone of the result after cyclic shift c2 as user 2, the explanation such as in Figure 28
As, cause user 2 data send frequency band in, subcarrier 23,24 deviate pilot tone transmission frequency band so that the sub- load
The precision of channel estimation of ripple deteriorates.In addition, in Fig. 1, DFT { ZCk（N-c1）}、DFT{ZCk（N-c2）It is respectively to L=11
CAZAC sequences ZCk（n）Implement cyclic shift c1, c2, then to ZCk（N-c1）、ZCk（N-c2）Implement DFT processing to obtain
Frequency field pilot tone.
Therefore, such as Fig. 1（B）It is shown, for each user, according to the transmission frequency band of data, make pilot tone that there is frequency deviation
In the case of when being multiplexed, the transmission frequency band of pilot tone covers the transmission frequency band of data all the time.In Fig. 1（B）Example in, by user
2 pilot tone DFT { ZCk（N-c2）1 subcarrier of biasing.
But, make pilot tone DFT { ZCk（N-c2）Biasing when, receive the copy ZC of pilot tone and known pilot in receiving sidek
（n）Between the degree of correlation be τ=c2, do not constitute peak value, cause peak to deviate so that can not correctly reduce pilot tone, as a result
Channel estimation can not be carried out.Illustrate the reason for correlation peak location deviates below.
The relation of the cyclic shift of frequency deviation and time domain
First, the relation of the cyclic shift of frequency deviation and time domain is illustrated.If to CAZAC sequences ZCk（n）Implement DFT to turn
Result after changing is set to F（m）, then F（m）It can be represented using following formula.
Use the formula（7）And formula（4）When being deformed so that following formula is set up.
Wherein,
Kc ≡ d (modL), θK, c=π k/L (c2- 2qc-cL%2)
In addition, d（modL）It is the remainder for obtaining d divided by L.
By formula（8）Understand, the way that CAZAC sequences apply cyclic shift c is equal in frequency field in the time domain
Apply the phase place of d sub- carrier cycle displacements.Wherein, k and L matter, c each other（<L）Uniquely determined according to k and d.For
Being readily appreciated that c is determined according to k, d, L, is set to c=s again（k、d、L）.Table 1 represents various s during with L=11（k、d、
L）The corresponding c values of combination with k.If for example, k=1, d=1, L11, c=1, if k=2, d=1, L11, c=6.
（Table 1）
S during L=11（k、d、L）
| k | S (k, 1,11) | S (k, 2,11) | S (k, 3,11) |
| 1 | 1 | 2 | 3 |
| 2 | 6 | 1 | 7 |
| 3 | 4 | 8 | 1 |
| 4 | 3 | 6 | 9 |
| 5 | 9 | 7 | 5 |
| 6 | 2 | 4 | 6 |
| 7 | 8 | 5 | 2 |
| 8 | 7 | 3 | 10 |
| 9 | 5 | 10 | 4 |
| 10 | 10 | 9 | 8 |
As above, such as Fig. 2（A）It is shown, apply the frequency deviation of 1 subcarrier for pilot tone 2, equivalent to such as Fig. 2（B）It is shown frequency
After the cyclic shift for applying 1 subcarrier in rate region, the component p11 in subcarrier 1 is set to be moved to subcarrier 12.As a result,
By formula（8）, make the correlation peak location of pilot tone 2（With reference to formula（5））Offset s（k、d、L）（τ=c2+s（k、d、L））.Due to leading
Frequently 1 correlation peak location（τ=c1）Do not offset, so the correlation peak location of pilot tone 2 and pilot tone 1 is relative to change s（k、d
=1, L=11）, pilot tone can not be correctly reduced in receiving side, channel estimation as a result can not be carried out.
In order that correlation peak location is in the past described position, cyclic shift amount from c2It is changed to（c2-s（k、d、L））
.That is, such as Fig. 3（A）It is shown, if applying d subcarrier of frequency deviation to pilot tone 2（It is d=1 in figure）And cyclic shift
（c2- s（k、d、L））, then relation such as Fig. 3 of pilot tone 1,2（B）It is shown.If carrying out above processing, each phase of pilot tone 1,2
Close peak not offset, can correctly reduce pilot tone in receiving side, it is possible to increase precision of channel estimation.That is, with carrying out Fig. 1
（A）It is identical before described frequency deviation, can be according to the position of correlation peak（τ=c1, τ=c2）Separate pilot tone 1 and pilot tone 2.
（A) the 1st pilot tone generation processing and channel estimation process
Fig. 4 is for realizing the d subcarrier of frequency deviation being illustrated in Figure 3 and cyclic shift（c2- s（k、d、L））, hair
The pilot tone of side is sent to generate processing spec figure.
CAZAC sequences generating unit 11 for example produces L=11 CAZAC sequences ZCk（n）It is used as pilot tone, cyclic shift portion 12
Make CAZAC sequences ZCk（n）Cyclic shift c2- s（k、d、L）Produce ZCk（N-c2+ s（k、d、L））, input DFT portions 13.NTXChi
It is very little（NTX=L=11）DFT portions 13 to ZCk（N-c2+ s（k、d、L））Implement DFT calculation process, produce pilot tone DFT { ZCk
（N-c2+ s（k、d、L））}.Subcarrier maps portion 14 makes 11 weight of pilot frequency p1~p11 of frequency field bias d subcarrier
（It is d=1 in figure）, input IFFT Department 15.
Fig. 5 is the biasing explanation figure in subcarrier maps portion 14,（A）Represent the situation without biasing（D=0）, subcarrier reflects
Penetrate frequency f of the portion 14 to IFFT Department 15i、fI+1、fI+2、、、fI+10Terminal input 11 weight of pilot frequency p1~p11, to other ends
Son input 0.（B）Indicate the situation of biasing（D=1）, frequency f from subcarrier maps portion 14 to IFFT Department 15i+1、fI+2、
fI+3、、、fi+11Terminal input 11 weight of pilot frequency p1~p11, to other terminals input 0.NFFTSize（Such as NFFT=128）
The subcarrier components that are inputted of 15 pairs of IFFT Department implement IDFT calculation process and be converted to time-domain signal, CP（Cyclic
Prefix, cyclic prefix）Insertion section 16 is additional to prevent cyclic prefix and the output of interference.（C）It is when having biasing（D=1）'s
Other embodiment.In this case, cyclic shift portion 12 makes CAZAC sequences ZCk（n）Cyclic shift c2And produce ZCk（N-c2）, it is defeated
Enter DFT portions 13.DFT portions 13 are to ZCk（N-c2）Implement DFT calculation process, produce pilot tone DFT { ZCk（N-c2）}.Subcarrier reflects
Portion 14 is penetrated to IFFT Department fi+1、fI+2、、、fI+10Terminal input weight of pilot frequency p2~p11, to IFFT Department fI+11Terminal input
Weight of pilot frequency p1.
Fig. 6 is the channel estimation process explanation figure of receiving side.
The pilot tone 1 and pilot tone 2 sent respectively from user 1 and user 2（Reference picture 3（B））It is multiplexed in the air, and conduct
Sub-carrier frequencies fi、fI+1、fI+2、fI+3、、、fi+11Subcarrier components（P1~p12）And input channel estimator.Subcarrier phase
Plus the subcarrier components p12 of non-overlapping copies is added by portion 52 with p1, carried using addition result as new sub-carrier frequencies f1
Wave component p1.
Copy signal multiplication portion 53 is for each subcarrier, by the copy signal of pilot tone（It is zero to cyclic shift amount
The CAZAC sequences ZC knownk（n）Implement the result after DFT calculation process）Qi is multiplied with pilot signal pi is received, IDFT portions 54
IDFT calculation process, the delayed profile of output time-domain are implemented to copy multiplied result.The delayed profile of time domain is the sample that length is L
This, has correlation peak, so contours extract portion 55 is according to t=in t=c1, t=c2（C1+c2）/ 2 separation correlation peaks,
Profile PRF1, the PRF2 for the sample that the length for producing user 1,2 is L/2.Profile from the DFT portions 56a of L dimension to L/2 length
PRF1 both sides insert L/4 zero respectively, constitute length L, carry out DFT computings.Thus, by DFT portions, 56a can obtain subcarrier
Frequency fi、fI+1、fI+2、、、fI+10In user 1 channel estimation value h1~h11.Equally, the DFT portions 56b of L dimension is to L/2 samples
The profile PRF2 of this length both sides insert L/4 zero respectively, constitute length L, carry out DFT computings.Thus, by DFT portions, 56b can
To obtain sub-carrier frequencies fI+1、fI+2、fI+3、、、fI+11In user 2 channel estimation value h2~h12.Wherein, in subcarrier
In addition portion 52, p1 is added with p2 and sub-carrier frequencies f is used asiSubcarrier components, so exporting from DFT portions 56b
Sub-carrier frequencies fiChannel estimation value be used as sub-carrier frequencies fI+11Channel estimation h12.
In accordance with the above, if respectively for pilot tone 1 and pilot tone 2, the distortion caused by propagation state is small, then such as Fig. 6 institutes
Show, copy is multiplied by after the component of non-overlapping copies is added by receiving side, then with completely orthogonal in the delayed profile of time domain
Form is separated.When the distortion caused by propagation state is big, subcarrier addition can also be omitted, and is directly multiplied by copy, Ran Hou
Separated in the delayed profile of time domain.
（b）2nd pilot tone generation processing and channel estimation process
In above-mentioned 1st pilot tone estimation processing, the subcarrier components p12 of non-overlapping copies is added with p1, addition result
It is considered as sub-carrier frequencies fiComponent.But, if receiving the sub-carrier frequencies f of signaliCarrier component be by p12 and
P1 is added obtained value, then need not be added subcarrier in receiving side.
Fig. 7 is the 2nd pilot tone generation processing spec figure,（A）Represent user 1, the data subcarrier of user 2.
Sending side（User 1）According to Fig. 7（B）It is shown, by the sub-carrier frequencies f of pilot tone 1iSubcarrier components p1 be copied into
For sub-carrier frequencies fI+11Subcarrier components, and according to Fig. 7（C）Shown, user 2 is by the sub-carrier frequencies f of pilot tone 2I+11
Subcarrier components p12 replicate turn into sub-carrier frequencies fiSubcarrier components and be transmitted.Thus, according to Fig. 7（D）Institute
Show, these pilot tones are re-used, and are received by receiving side, the carrier component for receiving the sub-carrier frequencies f1 of signal is by p1 and p12
Obtained value is added, the carrier component of sub-carrier frequencies is also that p1 is added to obtained value with p12, it is not necessary to the son load of receiving side
Ripple is added.
Fig. 8 is the clone method explanation figure of sending side,（A）It is the clone method of the pilot tone 1 of user 1, subcarrier maps portion
14 also to the frequency f of IFFT Department 15i+11Terminal input pilot tone 1 sub-carrier frequencies fiCarrier component p1 so that the pilot tone 1
Sub-carrier frequencies fiCarrier component p1 can also be sub-carrier frequencies fI+11Subcarrier components.（B）It is the pilot tone of user 2
2 clone method, subcarrier maps portion 14 is also to the frequency f of IFFT Department 15iTerminal input pilot tone 12 sub-carrier frequencies
fI+11Carrier component p12 so that the sub-carrier frequencies f of the pilot tone 12I+11Carrier component p12 can also be sub-carrier frequencies
fiSubcarrier components.（C）It is the other embodiment of the clone method of the pilot tone 2 of user 2, corresponding to Fig. 5（C）.
Fig. 9 is the channel estimation process explanation figure of receiving side.The pilot tone 1 and pilot tone 2 sent respectively from user 1 and user 2
（Reference picture 7（B）、（C））It is re-used in the air, is considered as sub-carrier frequencies fi、fI+1、fI+2、fI+3、、、fi+11Subcarrier components
（P1~p12）And input channel estimator（Fig. 7（D））.
The copy signal multiplication portion 53 of user 1 is for each subcarrier, by the copy signal qi of pilot tone（Q1~q11）With
Receive pilot signal pi（P1~p11）It is multiplied, then IDFT portions 54, related separation unit 55, DFT portions 56 are carried out and phase shown in Fig. 6
Same processing, produces channel estimation value h1~h11 of user 1.
On the other hand, the copy signal multiplication portion 53' of user 2 is for each subcarrier, by the copy signal qi of pilot tone
（Q1~q11）With reception pilot signal pi（P2~p12）It is multiplied, then IDFT portions 54', correlation separation unit 55', DFT portion 56' enter
Row is handled with the identical of user 1, produces channel estimation value h2~h12 of user 2.
（c）3rd pilot tone generation processing and channel estimation process
In above-mentioned 1st channel estimation process, the weight of pilot frequency of user 1 and leading for user 2 are separated in related separation unit 55
Frequency component, but as shown in Figure 10, when 1 frame includes such as 2 pilot blocks, can be separated as described below.Figure 11 is
The explanation figure of pilot separation,（A）Represent user 1, the data subcarrier of user 2.
To the first pilot tone 1 of user 1, user 2（=DFT { ZCk（N-c1）}）, pilot tone 2（=DFT { ZCk（N-c2+s
（k、d、L））}）Each subcarrier components, according to（B）、（C）It is shown to be multiplied by+1 and be transmitted, to next pilot tone 1, lead
Frequently 2 each subcarrier components, according to（D）、（E）It is shown to be multiplied by+1, -1 respectively and be transmitted.
Thus, receiving side receives following pilot frequency multiplexing signal first,
DFT{ZCk(n-c1)}×(+1)+DFT{ZCk(n-c2+s (k, d, L)) × (+1) and then the following pilot frequency multiplexing of reception
Signal.
DFT{ZCk(n-c1)}×(+1)+DFT{ZCk(n-c2+s(k,d,L))×(-1)
Therefore, in order in the pilot tone of receiving side generation user 1, to first pilot frequency multiplexing signal plus next pilot frequency multiplexing
Signal.That is, because the polarity of pilot tone 2 is different, so offsetting pilot tone 2 by phase Calais, it is left pilot tone 1.Also, in order to
Receiving side produces the pilot tone of user 2, and next pilot frequency multiplexing signal is subtracted from first pilot frequency multiplexing signal.That is, due to leading
Frequently 1 polarity is identical, so offsetting pilot tone 1 by subtracting each other, is left pilot tone 2.
Figure 12 is the channel estimation process explanation figure of receiving side.The pilot tone 1 and pilot tone 2 sent respectively from user 1 and user 2
（Reference picture 11（B）、（C）；（D）、（E））It is re-used in the air, is considered as sub-carrier frequencies fi、fI+1、fI+2、fI+3、、、fi+11Son
Carrier component（P1~p12）And input channel estimator.
Subcarrier operational part 61 receives the 1st and receives pilot signal to be preserved between block.Then, subcarrier operational part between block
61 in the case where producing the pilot tone of user 1, if receiving the 2nd receives pilot signal, for each subcarrier by the 1st, the 2nd
Receive pilot signal to be added, produce the sub-carrier frequencies f of pilot tone 1i、fI+1、fI+2、fI+3、、、fI+10Carrier component p1~
p11.The copy signal multiplication portion 53 of user 1 is for each subcarrier, by the copy signal qi of pilot tone（Q1~q11）And reception
Pilot signal pi（P1~p11）It is multiplied, then IDFT portions 54, related separation unit 55, DFT portions 56 carry out same as shown in Figure 6
Processing, produces channel estimation value h1~h11 of user 1.In addition, though precise decreasing, but copy signal can be multiplied
As a result as channel estimation value h1~h11.
On the other hand, in the case where producing the pilot tone of user 2, subcarrier operational part 61 will for each subcarrier between block
1st, the 2nd reception pilot signal is subtracted each other, and produces the sub-carrier frequencies f of pilot tone 2i+1、fI+2、fI+3、、、fi+11Carrier component p2~
p12.The copy signal multiplication portion 53' of user 2 is for each subcarrier, by the copy signal qi of pilot tone（Q1~q11）With connect
Receive pilot signal pi（P2~p12）It is multiplied, then IDFT portions 54', related separation unit 55', DFT portion 56' carry out identical with user 1
Processing, produce user 2 channel estimation value h2~h12.
In the above description, pilot tone block number is 2, but when pilot tone block number is even number, can also be applicable above-mentioned 3rd pilot tone
Generation processing and channel estimation process.In this case, base station indicates some user terminal and makes it to the pilot tone of whole blocks
Signal is multiplied by+1, and indicates other users terminal and it is multiplied by+1 to half pilot signal, to remaining half pilot signal
It is multiplied by -1.Also, base station is when multiplexing reception is to the pilot signal sent from each user terminal, all pieces of pilot tones are believed
Number implement plus and minus calculation processing, so as to only be left come from predesignated subscriber's terminal（User terminal 1 or 2）Pilot signal, to computing
As a result the copy of pilot signal is multiplied by, copy multiplied result is converted to time-domain signal, institute is then separated from the time-domain signal
State the signal section of user terminal and carry out channel estimation.
（B）Movement station
Figure 13 is the structure chart of movement station.
When generating uplink data sending, movement station（User terminal）Resource allocation request is carried out to base station, base station is pressed
According to the request, resource allocation is carried out according to the transmission path state of movement station, resource allocation information is notified to movement station.It is mobile
Stand to send and notify the data and pilot tone of coming.That is, the wireless signal received from base station is converted to baseband signal by radio section 21, input
Receive signal baseband processing unit 22.Baseband processing section 22 mask data and other control information from signal is received, are separated simultaneously
Resource allocation information simultaneously inputs transmission department of resource management 23.In resource allocation information, except transmission frequency band, timing, the tune of data
Mode processed etc. is outer, transmissions frequency band also comprising pilot tone, be used as pilot tone CAZAC sequences sequence number and sequence length L, circulate
Shift amount, amounts of frequency offset d etc..
Department of resource management 23 is sent by the information input data processing unit required for the transmission processing of data, control information
24, the information that pilot tone is generated/sent required for processing inputs pilot tone generating unit 25.Data processing division 24 according to from send resource
The information that management department 23 inputs, implements data modulation, single carrier to data and control information and sends processing and export, pilot tone generation
Portion 25 carries out the processing such as generation, cyclic shift, frequency deviation of CAZAC sequences simultaneously according to from the instruction for sending department of resource management 23
Pilot tone is generated, frame generating unit 26 is for example according to 6 data blocks and 2 pilot blocks of being time-multiplexed shown in Figure 10, delta frame, from wireless
Portion 21 is sent to base station.
Figure 14 is the structure chart of pilot tone generating unit 25, is according to the 1st pilot tone generation processing generation pilot tone being illustrated in Figure 3
When structure chart,（A）It is the structure chart that cyclic shift is carried out before DFT,（B）It is the knot for carrying out cyclic shift after the ifft
Composition.
In Figure 14（A）In, send the pilot tone life that department of resource management 23 is included the resource allocation information received from base station
Into, send required for parameter（CAZAC sequence numbers, sequence length, cyclic shift amount, amounts of frequency offset）Input various pieces.
CAZAC sequences generating unit 11, which is produced, indicated has sequence length L, the CAZAC sequences ZC of sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 makes CAZAC sequences ZCk（n）C sample indicated by cyclic shift, by obtained ZCk（N-c）
Input DFT portions 13.For example, if Fig. 3（B）Pilot tone 1, then cyclic shift portion 12 make ZCk（n）Displacement c1 and produce ZCk（N-
c1）, if pilot tone 2, then cyclic shift c2- s（k、d、L）And produce ZCk（N-c2+s（k、d、L））, input DFT portions 13.
NTXSize（NTX=L）The pilot tone ZC that is inputted of 13 pairs of DFT portionsk（N-c）Implement DFT calculation process, produce leading for frequency field
Frequency DFT { ZCk（N-c）}.Subcarrier maps portion 14 controls the mapping position of pilot tone and enters line frequency according to indicated amounts of frequency offset d
Partially, NFFTSize（NFFT=128）The subcarrier components that are inputted of 15 pairs of IFFT Department implement IFFT calculation process, be converted to time domain
Signal, input frame generating unit 26.
Figure 14（B）It is the structure chart of the pilot tone generating unit 25 when carrying out cyclic shift after ifft, cyclic shift portion 12 is followed
Ring shifts c × NFFT/NTXIndividual sample, it is hereby achieved that and Figure 14（A）Identical result.
（C）Base station
Figure 15 is the structure chart of base station.
When producing uplink data sending, movement station（User）Execution sets up the step of communication linkage at it between base station
Suddenly, transmission path situation is sent to base station during the step is performed.That is, movement station receives shared the leading from base station transmission
Frequency is simultaneously wirelessly determined（SIR or SNR is determined）, using wireless measurement result as transmission path situation report to base station.For example,
Transmission band is divided into multiple transmission frequency bands by base station, sends shared pilot tone according to each transmission frequency band, movement station is for each
Send frequency band wirelessly to be determined, measurement result is sent to base station.Base station obtains transmission path situation from movement station, connects simultaneously
When receiving resource allocation request, resource is distributed according to the transmission path situation of the movement station, resource allocation information is sent to movement
Stand.
The wireless signal received from movement station is converted to baseband signal, 32 mask datas of separation unit/control by radio section 31
Information and pilot tone, by data/control information input data processing unit 33, by pilot tone input channel estimator 34.Data processing division
33 and channel estimation unit 34 there is frequency etc. shown in Figure 24 to change structure.
Data processing division 33 is demodulated when setting up communication linkage in the transmission path situation data sent from movement station, input
Line link（uplink）Department of resource management 35.Uplink resource management portion 35 carries out resource allocation according to transmission path situation,
Generate resource allocation information and input downstream signal baseband processing section 36.In resource allocation information, except data transmission frequency band,
Regularly, modulation system etc. is outer, transmission frequency band also comprising pilot tone, be used as pilot tone CAZAC sequences sequence number and sequence it is long
Spend L, cyclic shift amount, amounts of frequency offset d etc..The time division multiplexing downlink data of downstream signal baseband processing section 36 and control information and resource
Information is distributed, and is sent from radio section 31.
Movement station is received after resource allocation information, in Figure 13, processing illustrated in fig. 14, send by data and lead
The frame that frequency is constituted.
Channel estimation unit 34 is using the pilot tone for separating and inputting in separation unit 32, and the 1st channel being illustrated in Figure 6 is estimated
Meter processing, by channel estimation value input data processing unit 33.Data processing division 33 carries out channel compensation, root according to channel estimation value
It is believed that road compensation result carries out the demodulation of data.In addition, uplink resource management portion 35 has cyclic shift amount calculating part 35a
With link distribution information instruction unit 35b.
Figure 16 is the structure chart of channel estimation unit 34, pair label identical with Fig. 6 identicals part mark.
51 pairs of the DFT portions pilot signal inputted from separation unit 32 implements DFT calculation process, and is converted to leading for frequency field
Frequency signal（Subcarrier components p1~p12）.The subcarrier components p12 of non-overlapping copies is added by subcarrier addition portion 52 with p1, will
Addition result as new sub-carrier frequencies f1 subcarrier components p1.
The copy signal qi of pilot tone is multiplied by copy signal multiplication portion 53 for each subcarrier with pilot signal pi is received,
Is implemented to copy multiplied result by IDFT calculation process, the pilot signal of output time-domain for IDFT portions 54.Contours extract portion 55 is according to t=
（C1+c2）/ 2 separation IDFT output signals, if the reception signal from user 1, then select profile PRF1（Reference picture 6）,
Implement DFT computings, output channel estimation value h1~h11 to profile PRF1 in DFT portions 56.On the other hand, if from user's 2
Signal is received, selection profile PRF2, DFT portions of contours extract portion 55 56 implement DFT computings to profile PRF2, export channel estimation value
H2~h12.
（D）2nd pilot tone generating unit and channel estimation unit
Figure 17（A）Be be illustrated in Figure 7 the 2nd pilot tone generation processing pilot tone generating unit structure chart, pair with figure
14（A）Pilot tone generating unit identical part mark identical label.It is a difference in that and is performed by subcarrier maps portion 14 based on frequency
The two actions of the duplication of the weight of pilot frequency of deviator d subcarrier maps and pre- subcarrier, other actions are identical.
CAZAC sequences generating unit 11, which is produced, indicated has sequence length L, the CAZAC sequences ZC of sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 is by CAZAC sequences ZCk（n）C sample indicated by cyclic shift, by obtained ZCk（N-c）
Input DFT portions 13.For example, if Fig. 7（B）User 1 pilot tone 1, then cyclic shift portion 12 make ZCk（n）Displacement c1 and
Produce ZCk（N-c1）, if the pilot tone 2 of user 2, then cyclic shift c2- s（k、d、L）And produce ZCk（N-c2+s
（k、d、L））, input DFT portions 13.NTXSize（NTX=L）The pilot tone ZC that is inputted of 13 pairs of DFT portionsk（N-c）Implement DFT computings
Processing, produces the pilot tone DFT { ZC of frequency fieldk（N-c）}.
Subcarrier maps portion 14 carries out sub- load according to from Copy Info and frequency deviation information that department of resource management 23 indicates is sent
Ripple maps.For example, to Fig. 7（B）User 1 pilot tone 1 carry out Fig. 8（A）Shown subcarrier maps processing, to Fig. 7（C）Use
The pilot tone 2 at family 2 carries out Fig. 8（B）Shown subcarrier maps processing.NFFTSize（Such as NFFT=128）15 pairs of institutes of IFFT Department
The subcarrier components of input implement IFFT calculation process, are converted to the pilot signal of time domain, input frame generating unit 26.
Figure 17（B）The structure chart of the channel estimation unit 34 for the 2nd channel estimation process being illustrated in Figure 9, pair with
Figure 16 channel estimation unit identical part marks identical label.It is a difference in that and deletes subcarrier addition portion 52 and pair
The multiplication processing in this signal multiplication portion 53.
DFT portions 51 implement DFT calculation process for the pilot signal inputted from separation unit 32, are converted to leading for frequency field
Frequency signal（Subcarrier components p1~p12）., will be from if copy signal multiplication portion 53 receives the pilot tone 1 from user 1
The subcarrier f for the reception pilot tone that DFT portions 51 are exportedi、fI+1、fI+2、fI+3、、、fI+10Component p1~p11 and copy signal q1
~q11 is multiplied, if receiving the pilot tone 2 from user 2, by the subcarrier f of the reception pilot tone exported from DFT portions 51I+1、
fI+2、fI+3、、、fi+11Component p2~p12 be multiplied with copy signal.
Then, IDFT portions 54 implement IDFT calculation process, the delayed profile of output time-domain to copy multiplied result.Profile is carried
Portion 55 is taken according to t=（C1+c2）/ 2 separation IDFT output signals, if the pilot signal from user 2, then select profile
PRF1（Reference picture 6）, DFT portions 56 implement DFT computings, output channel estimation value h1~h11 to profile PRF1.On the other hand, such as
Fruit is the reception signal from user 1, and selection profile PRF2, DFT portions of contours extract portion 55 56 implement DFT fortune to profile PRF2
Calculate, output channel estimation value h2~h12.
（E）3rd pilot tone generating unit and channel estimation unit
Figure 18（A）Be be illustrated in Figure 11 the 3rd pilot tone generation processing pilot tone generating unit structure chart, pair with figure
14（A）Pilot tone generating unit identical part mark identical label.It is a difference in that and has added polarity appendix 61, other actions
It is identical.
CAZAC sequences generating unit 11, which is produced, indicated has sequence length L, the CAZAC sequences ZC of sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 is by CAZAC sequences ZCk（n）C sample indicated by cyclic shift, by obtained ZCk（N-c）
Input DFT portions 13.For example, if Figure 11（B）、（D）User 1 pilot tone 1, then cyclic shift portion 12 make ZCk（n）Displacement
C1 and produce ZCk（N-c1）, if the pilot tone 2 of user 2, then cyclic shift c2- s（k、d、L）And produce ZCk（N-c2
+ s（k、d、L））, input DFT portions 13.NTXSize（NTX=L）The pilot tone ZC that is inputted of 13 pairs of DFT portionsk（N-c）Implement DFT
Calculation process, produces the pilot tone DFT { ZC of frequency fieldk（N-c）}.
Subcarrier maps portion 14 carries out subcarrier maps according to from the frequency deviation information for sending the instruction of department of resource management 23.Polarity
The polarity indicated by sending department of resource management 23 is attached to the output in subcarrier maps portion 14 by appendix 61, inputs IFFT Department
15.For example, if the pilot tone 1 of user 1, due to indicating+1 polarity in the 1st, the 2nd pilot blocks（Reference picture 11（B）、
（D））, so polarity appendix 61 is multiplied by+1 to all carrier components exported from subcarrier maps portion 14, input IFFT Department
15.Also, if the pilot tone 2 of user 2, due to indicating+1 polarity, the finger in the 2nd pilot blocks in the 1st pilot blocks
Show -1 polarity（Reference picture 11（C）、（E））, so polarity appendix 61 is directed to all loads exported from subcarrier maps portion 14
Wave component, is multiplied by+1 to the 1st pilot blocks and inputs IFFT Department 15, is multiplied by -1 to the 2nd pilot blocks and inputs IFFT Department 15.
NFFTSize（NFFT=128）The subcarrier components that are inputted of 15 pairs of IFFT Department implement IFFT calculation process, conversion
For the pilot signal of time domain, input frame generating unit 26.
Figure 18（B）The structure chart of the channel estimation unit 34 for the 3rd channel estimation process being illustrated in Figure 12, pair with
Figure 16 channel estimation unit identical part marks identical label.Subcarrier addition portion 62 replaces son between being a difference in that setting block
Carrier wave addition portion 52.
The pilot signal for the 1st pilot blocks that 51 pairs of DFT portions are inputted from separation unit 32 implements DFT calculation process, is converted to frequency
The pilot signal in rate region（Subcarrier components p1~p12）, subcarrier addition portion 62 is the pilot signal between block（Subcarrier components
P1~p12）It is stored in built-in memory.Then, the pilot tone letter for the 2nd pilot blocks that 51 pairs of DFT portions are inputted from separation unit 32
Number implement DFT calculation process, be converted to the pilot signal of frequency field（Subcarrier components p1~p12）, subcarrier between input block
Addition portion 62.
If subcarrier addition portion 62 receives the pilot tone 1 from user 1 between block, it will be preserved for each subcarrier
The 1st pilot blocks pilot signal（Subcarrier components p1~p12）With the pilot signal of the 2nd pilot blocks（Subcarrier components p1~
p12）It is added.Thus, what removal was re-used comes from other users（Such as user 2）Pilot signal component.Also, son is carried between block
If ripple addition portion 62 receives the pilot tone 2 from user 2, for each subcarrier leading from the 1st pilot blocks preserved
Frequency signal（Subcarrier components p1~p12）Subtract the pilot signal of the 2nd pilot blocks（Subcarrier components p1~p12）.Thus, remove
What is be re-used comes from other users（Such as user 1）Pilot signal component.
If copy signal multiplication portion 53 receives the pilot tone 1 from user 1, subcarrier addition portion 62 between block is exported
Reception pilot tone subcarrier fi、fI+1、fI+2、fI+3、、、fI+10Component p1~p11 be multiplied with copy signal q1~q11, such as
Fruit receives the pilot tone 2 from user 2, then by the subcarrier f of the reception pilot tone that subcarrier addition portion 62 is exported between blockI+1、
fI+2、fI+3、、、fi+11Component p2~p12 be multiplied with copy signal q1~q11.
Then, IDFT portions 54 implement IDFT calculation process, the pilot signal of output time-domain to copy multiplied result.Profile is carried
Portion 55 is taken according to t=（C1+c2）/ 2 separation IDFT output signals, if the pilot signal from user 1, then select profile
PRF1（Reference picture 6）, DFT portions 56 implement DFT computings, output channel estimation value h1~h11 to profile PRF1.On the other hand, such as
Fruit is the reception signal from user 2, and selection profile PRF2, DFT portions of contours extract portion 55 56 implement DFT fortune to profile PRF2
Calculate, output channel estimation value h2~h12.
（F）Self Adaptive Control
As previously described, the uplink resource management portion 35 of base station is passed through（Figure 15）According to the transmission path feelings of movement station
Condition, determines transmission frequency band, CAZAC sequence numbers and the sequence length L of pilot tone, cyclic shift amount, frequency deviation d etc., notifies to movement station.
Also, the uplink resource management portion 35 of base station is also according to the transmission path situation of each movement station, it is determined that sending in frequency band
Multiplexing number.
Figure 19 is frequency distribution explanation figure when multiplexing number is 4,12 initial subcarriers is distributed user 1, to user 2
The 2nd 12 subcarriers are distributed, the 3rd 12 subcarriers is distributed to user 3, last 12 subcarriers is distributed user 4, at this
In the case of kind, change cyclic shift amount to use sequence length L=19 CAZAC sequences ZCk（n）, it is used as leading for each user
Frequently.
The frequency deviation of pilot tone is configured to send frequency bandwidth to cover the data of each user as much as possible.Cyclic shift meter
Calculation portion 35a（Figure 15）The cyclic shift amount of each user is calculated according to following formula.
ci=cp- s (k, d, L) (9)
Wherein, i, p represent that data send band number and user's sequence number respectively.Also, s（k、d、L）Represent according to sequence
The cyclic shift amount that number k, sequence length L, frequency deviation are produced, the relation shown in following formula is set up.
Ks (k, d, L) ≡ d (modL) (10)
The c of p-th of userpIt can for example be calculated using following formula.
cp=(p-1) × [L/P] p=1,2, P (11)
P represents the pilot number being multiplexed by cyclic shift（Number of users）.In the case of shown in Figure 19, user 1~
The cyclic shift amount c of user 41~c4It is as follows.
c1=0
c2=[L/4]
c3=[2L/4]-s (k, d, L)
c4=[3L/4]-s (k, d, L)
But, sometimes according to the reception mode of pilot signal, the channel estimation characteristic for sending frequency band two ends of pilot tone deteriorates,
The channel estimation characteristic of center section is good.I.e., as shown in figure 19, sometimes in the transmission frequency band of subcarrier 1~12,37~48
Precision of channel estimation deteriorates, and precision of channel estimation is good in the transmission frequency band of subcarrier 13~24,25~36.
Therefore, for transmission path user in bad order, the hair of the subcarrier 13~24,25~36 in the middle of preferential distribution
Frequency band is sent, for all right user of transmission path, the transmission frequency band of the subcarrier 1~12,37~48 of both sides is distributed.This
Sample, eliminates the user that precision of channel estimation extremely deteriorates.Figure 19 illustrates the transmission for distributing user 2, user 3 centre
The example of frequency band.
And it is possible to carry out control as shown in Figure 20, Figure 21（Jump control）, each is distributed to for the switching of each frame
The transmission frequency band of user.Figure 20 is the distribution explanation figure in odd number frame, and Figure 21 is the distribution explanation figure in even number frame.
In odd number frame, as shown in figure 20, the subcarrier 1~12,37~48 of both sides is distributed user 1, user 4,
The subcarrier 13~24,25~36 of centre is distributed user 2, user 3.Also, it is as shown in figure 21, right in even number frame
User 4, user 1 distribute centre subcarrier 13~24,25~36, to user 3, user 2 distribute both sides subcarrier 1~12,
37~48.In addition, in odd number frame, frequency deviation is multiplied by the pilot tone of user 3, user 4, in even number frame, to user
1st, the pilot tone of user 2 is multiplied by frequency deviation.This eliminates the user that precision of channel estimation extremely deteriorates.
Figure 22 be carry out jump control when pilot tone generating unit structure chart, pair and Figure 14（A）Pilot tone generating unit it is identical
Part mark identical label.It is a difference in that and has added frequency deviation switch control portion 71, other actions is identical.
CAZAC sequences generating unit 11, which is produced, indicated has sequence length L, the CAZAC sequences ZC of sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 makes CAZAC sequences ZCk（n）C sample indicated by cyclic shift, by obtained ZCk（N-c）
Input DFT portions 13.NTXSize（NTX=L）The pilot tone ZC that is inputted of 13 pairs of DFT portionsk（N-c）Implement DFT calculation process, produce
Pilot tone DFT { the ZC of frequency fieldk（N-c）}.Frequency deviation switch control portion 71 is according to by sending the frequency deviation that department of resource management 23 indicates
Measure d and dancing mode, it is determined whether to carry out frequency deviation.Subcarrier maps portion 14 is according to whether will carry out frequency deviation to carry out subcarrier
Mapping.NFFTSize（NFFT=128）The subcarrier components that are inputted of 15 pairs of IFFT Department implement IDFT calculation process, when being converted to
The pilot signal in domain, input frame generating unit 26.
The effect of invention
According to the present invention as described hereinbefore, it can accurately carry out deviateing the data transmission subcarrier that pilot tone sends frequency band
Channel estimation.
Also, according to the present invention, even if using to predetermined sequence（Such as CAZAC sequences ZCk（n））Implement not same amount
Cyclic shift after result as the pilot tone for the user that will be multiplexed, also can accurately be allocated to each user's
The channel estimation of subcarrier.
Also, according to the present invention, even if being used as inciting somebody to action predetermined sequence is implemented the result after different amounts of cyclic shift
The pilot tone for the user to be multiplexed, the pilot tone of each user can be also separated using simple method, channel estimation is carried out.
Also, according to the present invention, by the transmission frequency band for preferentially distributing the bad user of transmission path situation pilot tone
Center section, even the bad user of transmission path situation, the data that can also improve the user send the channel of subcarrier
Estimated accuracy.
Also, according to the present invention, make to distribute to the data transmission frequency band of user pilot tone send frequency band center section and
Marginal portion is jumped, even the bad user of transmission path situation, can also improve the transmission data subcarrier of the user
Precision of channel estimation.
Claims (2)
1. a kind of wireless communications method, the 1st user and the 2nd user are sent using the 1st subcarrier group and the 2nd subcarrier group respectively
Data, are transmitted for the pilot signal of the user of data-reusing the 1st and the 2nd user, the wireless communications method
It is characterised by,
It will apply cyclic shift to the CAZAC sequences with sequence length L respectively and the 1st user that generates and the 2nd user lead
When frequency signal is configured at different frequency,
For the pilot signal of the 1st user, i-th of sub-carrier frequencies f of the low-frequency band side of frequency band will be sentiSubcarrier point
Amount replicates the i-th+L sub-carrier frequencies f as high frequency band sidei+LSubcarrier components,
For the pilot signal of the 2nd user, the i-th+L sub-carrier frequencies f of the high frequency band side of frequency band will be senti+LSon load
Wave component replicates i-th of sub-carrier frequencies f as low-frequency band sideiSubcarrier components, or will send frequency band low-frequency band
I-th of sub-carrier frequencies f of sideiSubcarrier components replicate the i-th+L sub-carrier frequencies f as high frequency band sidei+LSon load
Wave component.
2. a kind of wireless communications method, sends the 1st user terminal using the 1st subcarrier group and the 2nd subcarrier group to base station respectively
With the data of the 2nd user terminal, carried out for the pilot signal of the user terminal of data-reusing the 1st and the 2nd user terminal
Send, the wireless communications method is characterised by,
1st user terminal and the 2nd user terminal will apply cyclic shift to the CAZAC sequences with sequence length L respectively
And the 1st user and the pilot signal of the 2nd user generated be when being configured at different frequency,
For the pilot signal of the 1st user, i-th of sub-carrier frequencies f of the low-frequency band side of frequency band will be sentiSubcarrier point
Amount replicates the i-th+L sub-carrier frequencies f as high frequency band sidei+LSubcarrier components,
For the pilot signal of the 2nd user, the i-th+L sub-carrier frequencies f of the high frequency band side of frequency band will be senti+LSon load
Wave component replicates i-th of sub-carrier frequencies f as low-frequency band sideiSubcarrier components, or will send frequency band low-frequency band
I-th of sub-carrier frequencies f of sideiSubcarrier components replicate the i-th+L sub-carrier frequencies f as high frequency band sidei+LSon load
Wave component,
The base station is received to the 1st user and the 2nd user described in the data-reusing of the 1st user terminal and the 2nd user terminal
Pilot signal obtained by signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210457892.9A CN102938745B (en) | 2006-12-22 | 2006-12-22 | Wireless communications method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210457892.9A CN102938745B (en) | 2006-12-22 | 2006-12-22 | Wireless communications method |
| CN2006800565392A CN101554027B (en) | 2006-12-22 | 2006-12-22 | Wireless communication method, base station, and user terminal |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006800565392A Division CN101554027B (en) | 2006-12-22 | 2006-12-22 | Wireless communication method, base station, and user terminal |
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| Publication Number | Publication Date |
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| CN102938745A CN102938745A (en) | 2013-02-20 |
| CN102938745B true CN102938745B (en) | 2017-08-25 |
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| CN1343408A (en) * | 2000-01-05 | 2002-04-03 | 株式会社Ntt都科摩 | Signal format in multi-carrier CDMA transmission system |
| CN1620052A (en) * | 2003-11-19 | 2005-05-25 | 松下电器产业株式会社 | OFDM reception apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7426175B2 (en) * | 2004-03-30 | 2008-09-16 | Motorola, Inc. | Method and apparatus for pilot signal transmission |
| US7773535B2 (en) * | 2004-08-12 | 2010-08-10 | Motorola, Inc. | Method and apparatus for closed loop transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1343408A (en) * | 2000-01-05 | 2002-04-03 | 株式会社Ntt都科摩 | Signal format in multi-carrier CDMA transmission system |
| CN1620052A (en) * | 2003-11-19 | 2005-05-25 | 松下电器产业株式会社 | OFDM reception apparatus |
Non-Patent Citations (2)
| Title |
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| EUTRA SC-FDMA Uplink Pilot/Reference Signal Design;Motorola;《3GPP RAN WG1 #47 R1-063057》;20061110;1-4 * |
| Text Proposal On Uplink Reference Signal Structure;Texas Instruments;《3GPP TSG-RAN WG1 LTE Meeting R1-060374》;20060117;1-3 * |
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| CN102938745A (en) | 2013-02-20 |
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