CN103220113B - Wireless communication method, base station and user terminal - Google Patents
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Abstract
The invention provides a wireless communication method, a base station and a user terminal. A data signal of a first user and a data signal of a second user are respectively transmitted by using a first subcarrier cluster and a second subcarrier cluster; and the data signals are also transmitted by multiplexing a pilot signal of the first user and a pilot signal of the second user. The wireless communication method is characterized in that the pilot signals of the first user and the second user, which are respectively generated by a Zadoff-Chu sequence, are configured at different frequencies; and aiming at the pilot signal of the first user and the pilot signal of the second user respectively, a subcarrier component of certain subcarrier frequency is used as the subcarrier component of other subcarrier frequencies.
Description
The application is to be on December 22nd, 2006 applying date, Application No. 200680056539.2, invention 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, in more particularly, to following wireless communication system
Wireless communications method and base station and user terminal：Each user terminal is using the mutually different data is activation frequency being distributed by base station
The frequency of band sends data-signal to this base station, is simultaneous for data-signal time division multiplexed pilots signal and is sent to this base station.
Background technology
In the wireless communication system of cellular system etc., typically it is timed same using known pilot signal in receiving side
Step and transmission path estimation（Channel estimation）, and carry out the demodulation of data accordingly.And, by according to channel quality Lai adaptive
Modulation system and encoding rate etc. should be changed to improve in the adaptive modulation system of handling capacity, in order to determine optimal modulation methods in ground
Formula and optimal encoding rate, are estimating channel quality, such as signal to noise ratio SIR（Signal to Interference Ratio）Deng
When also using pilot signal.
There is OFDM as the stronger accessing wirelessly mode of mitigating frequency-selective fading（Orthogonal Frequency
Division Multiplexing, OFDM）Mode, this frequency selective fading is because of wide band radio communication
In multipath.But, there is the PAPR of sending signal in OFDM（Peak to Average Ratio, peak-to-average power ratio）Larger
Problem, is not suitable as ul transmissions mode from the viewpoint of the power efficiency of terminal.Therefore, in the honeycomb of the second generation
System is in 3GPP LTE, and ul transmissions mode is by single carrier transmission, enters line frequency etc. in receiving side and changes（Non- patent
Document 1）.Single carrier transmission means that only multiplexing sends data and pilot signal on a timeline, with multiplexing number on the frequency axis
Compare according to the OFDM of pilot signal, can significantly reduce PAPR.
Single carrier transmission
Figure 23 is the frame format example of single carrier transmission, and Figure 24 is the explanatory diagram of the changes such as frequency.Frame is by respectively by N sample
Constitute data Data and pilot tone Pilot time division multiplex constitute, in fig 23, in 1 frame insert two pilot blocks.In frequency
During Deng changing, data/pilot separation unit 1 mask data Data and pilot tone Pilot, a FFT portion 2 implements at FFT to N sample data
Reason, produces N number of frequency component input channel compensation section 3.2nd FFT portion 4 implements FFT process to N sample pilot tone, produces N number of
Frequency component, channel estimation unit 5 uses N number of frequency component of this N number of frequency component and known pilot, and each Frequency Estimation is believed
Road characteristic, by channel compensation signal input channel compensation portion 3.Channel compensation portion 3 is directed to each frequency to defeated from a FFT portion 2
The N number of frequency component going out is multiplied by channel compensation signal to carry out channel compensation, and IFFT Department 6 is to the N number of frequency implemented after channel compensation
Rate component implements IFFT process, and is converted to time signal to export.
CAZAC sequence
In single carrier transmission, when entering line frequency etc. and changing in receiving side, in order to accurately carry out in frequency field
Channel estimation it is desirable to 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, it is desirable to be also uniform amplitude in the time domain from the viewpoint of PAPR.As realizing leading of these characteristics
Frequency sequence has CAZAC（Constant Amplitude Zero Auto Correlation, constant amplitude zero auto-correlation）Sequence,
3GPP LTE specifies be suitable for this CAZAC sequence as uplink pilot.CAZAC sequence has preferable autocorrelation,
So the amount being obtained by identical sequence cyclic shift is mutually orthogonal.In 3GPP LTE, different using cyclic shift amount
The method of pilot signal or the pilot signal being multiplexed different antennae by same subscriber that CAZAC sequence is multiplexed different user is referred to as
CDM（Code Division Multiplex, CDMA）.
Zadoff-Chu sequence as representational CAZAC sequence utilizes formula（1）Represent（Non-patent literature 2）.
ZCk(n)=exp {-j2 π k/L (qn+n (n+L%2)/2) } (1)
Wherein, k and L is relatively prime, represents sequence number, sequence length respectively.N represents code number, and q represents arbitrary integer, L%2 table
Show L divided by 2 remainders obtaining, be sometimes also expressed as Lmod（2）.It is following formula in the prime factor exploded representation L（2）When（gi
For prime number）,
It is little natural number φ of relatively prime ratio L with L（L）I.e. the sequence number of CAZAC sequence 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）, sequence number k of CAZAC sequence 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 sequence number k of CAZAC sequence is（L-1）.
Make CAZAC sequence ZCk（n）The ZC that cyclic shift c obtainsk（N-c）Using following formula（4）Represent.
ZCk(n-c)=exp {-j2 π k/L (q (n-c)+(n-c) (n-c+L%2)/2) } (4)
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, thus female to sequence number identical
Sequence ZCk（n）The sequence measuring plus different cyclic shifts is orthogonal each other.
When receiving the multiple pilot tone after the CDM multiplexing based on cyclic shift in wireless base station, by obtaining
With the degree of correlation of auxiliary sequence, can from pilot tone is demarcated in place of peak.The interval of cyclic shift is less, to multipath and reception
The patience of timing slip is weaker, it is possible to the multiplexing number realized has the upper limit.Multiplexing number based on cyclic shift is being set to P
When, distribute to cyclic shift amount c of p-th pilot tonepFor example can be according to following formula（6）Determine（Non-patent literature 3）.
cp=(p-1) * [L/p], wherein, p=1,, P (6)
As previously described, time division multiplexed pilots data in the up-link of 3GPP LTE, and sent out in SC-FDMA mode
Send.Figure 25 is the structure chart of SC-FDMA sending part, and 7' represents size NTXDFT（Discrete Fourier
Transformer, DFT）, 8' represents subcarrier maps portion, and 9' represents size NFFTIDFT portion, 10 expression CP
（Cyclic Prefix, Cyclic Prefix）Insertion section.In addition, in 3GPP LTE, in order to suppress treating capacity, NFFTIt is set to 2
The integer of power, and replace the IDFT after subcarrier maps using IFFT.
To auxiliary sequence ZCk（n）The process applying cyclic shift c 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 process, so later with DFT
Illustrate in case of being circulated shifting processing before.
Problem of the prior art
In order to reduce presence of intercell interference, need to reuse the CAZAC sequence of different sequence numbers as pilot tone in minizone.
This is because repeat number is bigger, the distance using the minizone of identical sequence is bigger, so the possibility producing severe jamming subtracts
Little.For this reason, it may be necessary to guarantee many CAZAC sequences, the Property requirements of CAZAC sequence will make sequence length L become larger prime number.Figure
26 is the interference explanatory diagram of minizone, such as（A）Shown, when the CAZAC sequence number that can use is 2, make between neighbor cell
With the CAZAC sequence of same sequence number, so producing the severe jamming of pilot tone.And, such as（B）Shown, in CAZAC sequence number be
Between neighbor cell, when 3, do not use the CAZAC sequence of same sequence number, but because repeat number is 3, smaller, so using phase
With sequence number CAZAC sequence minizone apart from comparatively short, the possibility of interference increases.As（C）Shown, in CAZAC sequence
When number is for 7, because repeat number is 7, ratio is larger, so being increased using the minizone distance of the CAZAC sequence of same sequence number, does
The possibility disturbed is gradually reduced.
But, in 3GPP LTE, such as Figure 27（A）Shown, data taken the multiple that sub-carrier number is set to 12, 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 sequence is set to 6, sequence number k is 2, due to using the CAZAC sequence of same sequence number in neighbor cell
Row, so produce the interference of pilot tone.And, when sequence length L is set to 5, k is 4, but still smaller, and as Figure 27
（B）Shown, produce the subcarrier of the data that pilot tone does not cover, lead to 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 filling
The sequence length of foot（3GPP R1-060925, R1-063183）.Figure 28 is the multiplexing number of this pilot signal is example when 2.
When sequence length L is set to 12, CAZAC sequence can only take 4, and presence of intercell interference increases（K=4）.Therefore, sequence length
L is set to prime number 11.When setting L=11,10 CAZAC sequences can be obtained（K=10）, presence of intercell 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 sequence to L=11
Row ZCk（n）Implement the pilot tone that the result after cyclic shift c1 is used as user 1, to CAZAC sequence ZCk（n）Implement cyclic shift
Result after c2 is used as the pilot tone of user 2.
But, in CAZAC sequence ZC by L=11k（n）Cyclic shift and to user 1,2 use when, as shown in Figure 28,
In user 1 and user 2, the relativeness of the transmission frequency band of the transmission frequency band data of pilot tone is different, leads to channel estimation essence
Degree is different.That is, the frequency band sub-carriers 23,24 that send leading to the data of user 2 deviate the transmission frequency band of pilot tone so that this sub- load
Precision of channel estimation in ripple deteriorates.
In addition, in Figure 28, according to current 3GPP LTE specification, the subcarrier spacing of pilot tone is set to the son load of data
2 times of wave spacing, but also produce the problems referred to above in the rate of change of subcarrier spacing.
Non-patent literature 1：3GPP TR25814-700 Figure9.1.1-1
Non-patent literature 2：B.M.Popovic, " Generalized Chirp-Like Polyphase Sequences
with Optimum Correlation Properties”,IEEE Trans.Info.Theory,Vol.38,pp.1406-
1409,July1992.
Non-patent literature 3：3GPP R1-060374,“Text Proposal On Uplink Reference Signal
Structure”,TI Instruments
Content of the invention
According to case above, it is an object of the 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 sequence ZCk（n））Implement different
Result after the cyclic shift of amount is used as the pilot tone of user to be multiplexed it is also possible to accurately be allocated to each user's
The channel estimation of subcarrier.
Another object of the present invention is to, even if implementing after different amounts of cyclic shift to predetermined CAZAC sequence
Result is used as the pilot tone of user to be multiplexed it is also possible to separating the pilot tone of each user using simple method and carrying out channel and estimate
Meter.
Another object of the present invention is to, even the bad user of transmission path situation is it is also possible to improve this user's
The precision of channel estimation of data subcarrier.
The present invention provides wireless communications method and base station and user terminal in wireless communication system, in this radio communication system
In system, each user terminal sends data using the frequency of the mutually different data is activation frequency band being distributed from base station to this base station
Signal, is simultaneous for data-signal, carries out time division multiplex to pilot signal and is sent to this base station.
Wireless communications method
The wireless communications method of the present invention includes the step executing following process：For each user terminal, total data is sent out
Frequency deviation implemented by a part of frequency band sending frequency band, to determine that the pilot tone of user terminal sends frequency band, so that the pilot tone of this user terminal
Send the data is activation frequency band that frequency band covers this user terminal；And it is directed to each user terminal, indicating user terminal, make this use
Family terminal carrys out pilot signal transmitted using the frequency that the pilot tone of described determination sends frequency band.
Described instruction step includes the step executing following process：For each user terminal, calculate the inclined of described frequency deviation
The amount of putting and cyclic shift amount corresponding with the multiplexing number of user terminal；And indicating user terminal, make this user terminal by CAZAC
The pilot signal of sequence circulates this cyclic shift amount, indicating user terminal simultaneously, makes this user terminal by this pilot signal frequency deviation
Described amounts of frequency offset.
Execute following steps in a base station：When multiplexing reception is to the multiple pilot signal sending from multiple user terminals,
The frequency component of the pilot signal of non-overlapping copies is added；Addition result is multiplied by with the copy of pilot signal；And copy phase
Result is taken advantage of to be converted to time-domain signal, then, the signal section separating predesignated subscriber's terminal from this time-domain signal to carry out channel
Estimate.
The wireless communications method of the present invention also includes the step executing following process：Obtain the transmission path feelings of movement station
Condition；Preferentially distribute the intermediate frequency band of described total frequency band, the data is activation frequency band as the user terminal of transmission path situation difference leads to
Know to this user terminal.Or, the wireless communications method of the present invention also includes the step executing following process：Carry out jump control
System, distributes intermediate frequency band and the edge band of described total frequency band, periodically as the data transmission frequency band of each user terminal.
Base station
The base station of the present invention has department of resource management, and this department of resource management is directed to each user terminal, and total data is sent
Frequency deviation implemented by a part of frequency band of frequency band, to determine that the pilot tone of user terminal sends frequency band, so that the pilot tone of this user terminal is sent
Frequency band covers the data is activation frequency band of this user terminal, and indicating user terminal, makes this user terminal leading using this determination
Take place frequently and send the frequency of frequency band to carry out pilot signal transmitted.
In a base station, described department of resource management has：Cyclic shift amount calculating part, it is directed to each user terminal, calculates
The amount of bias of described frequency deviation and cyclic shift amount corresponding with the multiplexing number of user terminal；And instruction unit, its instruction user is eventually
End, makes this user terminal that the pilot signal of described CAZAC sequence is circulated this cyclic shift amount, indicating user terminal simultaneously, makes
This user terminal is by this amounts of frequency offset described in pilot signal frequency deviation.
Base station also has the channel estimation unit carrying out channel estimation for each user terminal, and this channel estimation unit has：
Acceptance division, multiple pilot signals that its multiplexing reception sends from multiple user terminals；Addition portion, it is by the plurality of 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 this time-domain signal
The signal section of terminal；And estimator, the time signal after its this separation is converted to the signal of frequency field, to carry out letter
Road is estimated.
Described department of resource management obtains the transmission path situation of movement station, preferentially distributes the intermediate frequency band of described total frequency band,
Data is activation band notification as the user terminal of transmission path situation difference gives this user terminal.Or, described resource management
Portion's execution jump controls, and distributes intermediate frequency band and the edge band of described total frequency band periodically, as the number of each user terminal
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 to generate pilot tone according to the instruction of this uplink resource information, and this pilot tone generating unit has：CAZAC sequence
Generating unit, it produces the CAZAC sequence with predetermined sequence length and sequence number as pilot signal according to this resource information；The
1 converter section, the CAZAC sequence of its pilot signal as time domain is converted to the pilot signal of frequency field；Subcarrier maps
Portion, its frequency deviation information being comprised according to described resource information, the subcarrier components of pilot signal are mapped；2nd conversion
Portion, its pilot signal after implementing subcarrier maps is converted to the signal of time domain；And cyclic shift portion, its carry out described
Before 1st conversion or after carrying out described 2nd conversion, the displacement that comprised according to described resource information, make CAZAC sequence
Cyclic shift.
Brief description
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 for realizing frequency deviation d subcarrier and cyclic shift（c2- s（k,d,L））Sending side pilot tone generate
Processing spec figure.
Fig. 5 is the biasing explanatory diagram in subcarrier maps portion.
Fig. 6 is the channel estimation process explanatory diagram of receiving side.
Fig. 7 is that the 2nd pilot tone generates processing spec figure.
Fig. 8 is the clone method explanatory diagram of sending side.
Fig. 9 is the 2nd channel estimation process explanatory diagram of receiving side.
Figure 10 is frame assumption diagram.
Figure 11 is the explanatory diagram of pilot separation.
Figure 12 is the 3rd channel estimation process explanatory diagram 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 by the 2nd channel and generates process and the channel generating unit of channel estimation process and the structure of channel estimation unit
Figure.
Figure 18 is by the 3rd channel and generates process and the channel generating unit of channel estimation process and the structure of channel estimation unit
Figure.
Figure 19 is the frequency distribution explanatory diagram that multiplexing number is when 4.
Figure 20 is the explanatory diagram of the jump control of transmission frequency band that the switching of each frame is distributed to each user, is odd number
Distribution explanatory diagram in individual frame.
Figure 21 is the explanatory diagram of the jump control of transmission frequency band that the switching of each frame is distributed to each user, is even number
Distribution explanatory diagram in individual frame.
Figure 22 is by the structure chart of pilot tone generating unit when controlling that jumps.
Figure 23 is the frame format example of single carrier transmission.
Figure 24 is the explanatory diagram of the changes such as frequency.
Figure 25 is the structure chart of SC-FDMA sending part.
Figure 26 is the interference explanatory diagram of minizone.
Figure 27 is the 1st explanatory diagram that conventional data is activation frequency band and pilot tone send frequency band.
Figure 28 is the 2nd explanatory diagram that conventional data is activation frequency band and pilot tone send frequency band.
Specific embodiment
（A）The principle of the present invention
As Fig. 1（A）Shown, to CAZAC sequence ZCk（n）Implement the result after cyclic shift c1 and be used as leading of user 1
Frequently, to CAZAC sequence ZCk（n）When implementing the pilot tone that the result after cyclic shift c2 is used as user 2, such as explanation in Figure 28
As, lead to user 2 data send in frequency band, subcarrier 23,24 deviates the transmission frequency band of pilot tone so that this sub- load
The precision of channel estimation of ripple deteriorates.In addition, in FIG, DFT { ZCk（N-c1）}、DFT{ZCk（N-c2）It is respectively to L=11
CAZAC sequence ZCk（n）Implement cyclic shift c1, c2, then to ZCk（N-c1）、ZCk（N-c2）Implement DFT process to obtain
Frequency field pilot tone.
Therefore, as Fig. 1（B）Shown, for each user, according to the transmission frequency band of data, making pilot tone, there is frequency deviation
In the case of when being multiplexed, pilot tone send the transmission frequency band that frequency band covers 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, lead to peak deviate so that pilot tone, result can not correctly be reduced
Channel estimation can not be carried out.The reason explanation correlation peak location deviates below.
The relation of the cyclic shift of frequency deviation and time domain
First, the relation of frequency deviation and the cyclic shift of time domain is described.If to CAZAC sequence ZCk（n）Implement DFT to turn
Result after changing is set to F（m）, then F（m）Can be represented using following formula.
Using this formula（7）And formula（4）So that following formula is set up when being deformed.
Wherein, kc ≡ d (modL), θk,c=πk/L·(c2-2qc-c·L%2)
In addition, d (modL) is the remainder obtaining d divided by L.
From formula (8), the way applying cyclic shift c to CAzAC sequence in the time domain is equal in frequency field
Apply the phase place of d sub- carrier cycle displacement.Wherein, k and L matter each other, c (<L it is) well-determined according to k and d.For
C easy to understand is to be determined according to k, d, L, is again set to c s (k, d, L).Table 1 represent with L 1 when various s (k, d,
L) and k combination corresponding c value.For example, if k 1, d 1, L11, c 1, if k 1, d 1, L11, c 1.
(table 1)
S (k, d, L) during L=11
| 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, as shown in Fig. 2 (A), pilot tone 2 is applied to the frequency deviation of 1 subcarrier, be equivalent to as shown in Fig. 2 (B) in frequency
After applying the cyclic shift of 1 subcarrier in rate region, the component p11 in subcarrier 1 is made to move to subcarrier 12.As a result,
By formula (8), make correlation peak location (with reference to formula (5)) skew s (k, d, L) (τ=c2+s (k, d, L)) of pilot tone 2.Due to pilot tone 1
Correlation peak location (τ=c1) not do not offset, so pilot tone 2 relative with the correlation peak location of pilot tone 1 change s (k, d=1,
L=11), pilot tone can not correctly be reduced in receiving side, result can not carry out channel estimation.
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, as shown in Fig. 3 (A), if applying frequency deviation d subcarrier to pilot tone 2 (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）Shown.If carrying out above process, 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 carry out Fig. 1
（A）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）1st pilot tone generates and processes and channel estimation process
Fig. 4 is for realizing the frequency deviation d subcarrier and the cyclic shift that are illustrated in Figure 3（c2- s（k、d、L））, send out
The pilot tone sending side generates processing spec figure.
CAZAC sequence generating unit 11 for example produces CAZAC sequence ZC of L=11k（n）As pilot tone, cyclic shift portion 12
Make CAZAC sequence ZCk（n）Cyclic shift c2- s（k、d、L）Produce ZCk（N-c2+ s（k、d、L））, input DFT portion 13.NTXChi
Very little（NTX=L=11）DFT portion 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 the 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 explanatory diagram in subcarrier maps portion 14,（A）Represent the situation not having to bias（D=0）, subcarrier reflects
Penetrate portion 14 to frequency f of 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）, subcarrier maps portion 14 is to frequency f of 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）
IFFT Department 15 IDFT calculation process is implemented to the subcarrier components that inputted and is converted to time-domain signal, CP（Cyclic
Prefix, Cyclic Prefix）Insertion section 16 adds the Cyclic Prefix preventing disturbing and exports.（C）When being to have biasing（D=1）'s
Other embodiment.In the case of being somebody's turn to do, cyclic shift portion 12 makes CAZAC sequence ZCk（n）Cyclic shift c2And produce ZCk（N-c2）, defeated
Enter DFT portion 13.DFT portion 13 is to ZCk（N-c2）Implement DFT calculation process, produce pilot tone DFT { ZCk（N-c2）}.Subcarrier reflects
Penetrate portion 14 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 explanatory diagram of receiving side.
The pilot tone 1 sending respectively from user 1 and user 2 and pilot tone 2（With reference to Fig. 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
Subcarrier components p12 of non-overlapping copies are added by addition portion 52 with p1, using addition result as new sub-carrier frequencies f1 son
Carrier component p1.
Copy signal multiplication portion 53 for each subcarrier, by the copy signal of pilot tone（It is zero to cyclic shift amount
CAZAC sequence ZC knownk（n）Implement the result after DFT calculation process）Qi is multiplied with receiving pilot signal pi, IDFT portion 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, have correlation peak in t=c1, t=c2, so contours extract portion 55 is according to t=（C1+c2）/ 2 separate correlation peak,
The length of generation user 1,2 is profile PRF1, PRF2 of the sample of L/2.The DFT portion 56a of L dimension is to the profile of L/2 length
The both sides of PRF1 insert L/4 zero respectively, constitute length L, carry out DFT computing.Thus, subcarrier can be obtained by DFT portion 56a
Frequency fi、fI+1、fI+2、、、fI+10In user 1 channel estimation value h1～h11.Equally, the DFT portion 56b of L dimension is to L/2 sample
The both sides of the profile PRF2 of this length insert L/4 zero respectively, constitute length L, carry out DFT computing.Thus, can by DFT portion 56b
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 with p2 is added and as sub-carrier frequencies fiSubcarrier components, so exporting from DFT portion 56b
Sub-carrier frequencies fiChannel estimation value 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 little, then as Fig. 6 institute
Show, be multiplied by copy after the component of non-overlapping copies is added by receiving side, then with completely orthogonal in the delayed profile of time domain
Form separates.It is added it is also possible to omit subcarrier when distortion caused by propagation state is big, and be directly multiplied by copy, Ran Hou
Separate in the delayed profile of time domain.
（b）2nd pilot tone generates and processes and channel estimation process
In above-mentioned 1st pilot tone estimation is processed, subcarrier components p12 of non-overlapping copies are added with p1, addition result
It is considered as sub-carrier frequencies fiComponent.But, if sub-carrier frequencies f of receipt signaliCarrier component be by p12 and
The value that p1 addition obtains, then do not need to be added subcarrier in receiving side.
Fig. 7 is that the 2nd pilot tone generates processing spec figure,（A）Represent user 1, the data subcarrier of user 2.
Sending side（User 1）According to Fig. 7（B）Shown, by 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 sub-carrier frequencies f of pilot tone 2I+11
Subcarrier components p12 replicate become 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 of sub-carrier frequencies f1 of receipt signal is by p1 and p12
It is added the value obtaining, the carrier component of sub-carrier frequencies is also p1 with p12 to be added the value obtaining it is not necessary to the son of receiving side carries
Ripple is added.
Fig. 8 is the clone method explanatory diagram of sending side,（A）It is the clone method of the pilot tone 1 of user 1, subcarrier maps portion
14 also to frequency f of IFFT Department 15I+11Terminal input pilot tone 1 sub-carrier frequencies fiCarrier component p1 so that this 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 frequency f of IFFT Department 15iTerminal input pilot tone 12 sub-carrier frequencies
fI+11Carrier component p12 so that sub-carrier frequencies f of this 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 pilot tone 2 of user 2, corresponding to Fig. 5（C）.
Fig. 9 is the channel estimation process explanatory diagram of receiving side.The pilot tone 1 sending respectively from user 1 and user 2 and pilot tone 2
（With reference to Fig. 7（B）、（C））It is re-used in the air, be 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 for each subcarrier, by copy signal qi of pilot tone（Q1～q11）With
Receive pilot signal pi（P1～p11）It is multiplied, then IDFT portion 54, related separation unit 55, DFT portion 56 are carried out and phase shown in Fig. 6
Same process, produces the 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 copy signal qi of pilot tone
（Q1～q11）With reception pilot signal pi（P2～p12）It is multiplied, then IDFT portion 54', related separation unit 55', DFT portion 56' enter
Row is processed with user 1 identical, produces the channel estimation value h2～h12 of user 2.
（c）3rd pilot tone generates and processes and channel estimation process
In above-mentioned 1st channel estimation process, separate the weight of pilot frequency of user 1 and leading of user 2 in related separation unit 55
Frequency component, but as shown in Figure 10, when 1 frame comprises such as 2 pilot blocks, can carry out as described below separating.Figure 11 is
The explanatory diagram of pilot separation,（A）Represent user 1, the data subcarrier of user 2.
First pilot tone 1 to 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）Shown be multiplied by+1 and be transmitted, to next pilot tone 1, lead
Frequently 2 each subcarrier components, according to（D）、（E）Shown it is multiplied by+1, -1 respectively and is transmitted.
Thus, receiving side receives following pilot frequency multiplexing signal first,
DFT{ZCk(n-cl)}×(+1)+DFT{ZCk(n-c2+s (k, d, L)) × (+1) and then the following pilot frequency multiplexing of reception
Signal.
DFT{ZCk(n-cl)}×(+l)+DFT{ZCk(n-c2+s(k,d,L))×(-1)
Therefore, in order to produce the pilot tone of user 1 in receiving side, add next pilot frequency multiplexing to first pilot frequency multiplexing signal
Signal.That is, because the polarity of pilot tone 2 is different, so pilot tone 2, remaining pilot tone 1 are offset by phase Calais.And, in order to
Receiving side produces the pilot tone of user 2, deducts next pilot frequency multiplexing signal from first pilot frequency multiplexing signal.That is, due to leading
Frequently 1 polarity is identical, so to offset pilot tone 1 by subtracting each other, remaining pilot tone 2.
Figure 12 is the channel estimation process explanatory diagram of receiving side.The pilot tone 1 sending respectively from user 1 and user 2 and pilot tone 2
（With reference to Figure 11（B）、（C）；（D）、（E））It is re-used in the air, be considered as sub-carrier frequencies fi、fI+1、fI+2、fI+3、、、fI+11's
Subcarrier components（P1～p12）And input channel estimator.
Between block, subcarrier operational part 61 receives the 1st reception pilot signal and is preserved.Then, subcarrier operational part between block
61 in the case of the pilot tone producing user 1, if receiving the 2nd reception pilot signal, for each subcarrier by the 1st, the 2nd
Receive pilot signal to be added, produce 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 for each subcarrier, by copy signal qi of pilot tone（Q1～q11）And reception
Pilot signal pi（P1～p11）Be multiplied, then IDFT portion 54, related separation unit 55, DFT portion 56 carry out same as shown in Figure 6
Process, produce the channel estimation value h1～h11 of user 1.In addition, though precise decreasing, but copy signal can be multiplied
Result is as channel estimation value h1～h11.
On the other hand, in the case of the pilot tone producing user 2, between block, subcarrier operational part 61 will for each subcarrier
1st, the 2nd reception pilot signal is subtracted each other, and produces 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 for each subcarrier, by copy signal qi of pilot tone（Q1～q11）With
Receive pilot signal pi（P2～p12）It is multiplied, then IDFT portion 54', related separation unit 55', DFT portion 56' are carried out and user 1 phase
Same process, produces the channel estimation value h2～h12 of user 2.
In the above description, pilot tone block number is 2, but when pilot tone block number is even number it is also possible to be suitable for above-mentioned 3rd pilot tone
Generate and process and channel estimation process.In this case, base station indicates that certain user terminal makes it to the pilot tone of whole blocks
Signal is multiplied by+1, and indicates that other users terminal makes it be multiplied by+1 to half pilot signal, to remaining half pilot signal
It is multiplied by -1.Pilot tone letter and, base station is when multiplexing reception is to the pilot signal sending from each user terminal, to all pieces
Number implement plus and minus calculation process so that only be left be derived from predesignated subscriber's terminal（User terminal 1 or 2）Pilot signal, to computing
Result is multiplied by the copy of pilot signal, and copy multiplied result is converted to time-domain signal, then separates institute from this 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 creating uplink data sending, movement station（User terminal）Carry out resource allocation request to base station, base station is pressed
According to this request, resource allocation is carried out according to the transmission path state of movement station, resource allocation information is notified to movement station.Mobile
Stand and send the data notifying to come and pilot tone.That is, the wireless signal receiving from base station is converted to baseband signal by radio section 21, input
Receipt signal baseband processing section 22.Baseband processing section 22 mask data and other control information from receipt signal, concurrently separate
Resource allocation information simultaneously inputs transmission department of resource management 23.In resource allocation information, except data transmission frequency band, regularly, adjust
Mode processed etc. is outer, also comprises the sequence number of CAZAC sequence sending frequency band, being used as pilot tone and sequence length L, the circulation of pilot tone
Shift amount, amounts of frequency offset d etc..
Send department of resource management 23 by the information input data processing unit required for data, the transmission processe of control information
24, pilot tone is generated/transmission processe required for information input pilot tone generating unit 25.Data processing division 24 is according to from transmission resource
The information of management department 23 input, implements data modulation, single carrier transmission processe to data and control information and exports, pilot tone generates
Portion 25 is processed simultaneously according to from the instruction sending department of resource management 23, carrying out the generation of CAZAC sequence, cyclic shift, frequency deviation etc.
Generate pilot tone, for example according to time division multiplex 6 shown in Figure 10 data block and 2 pilot blocks, delta frame, from wireless for frame generating unit 26
Portion 21 is sent to base station.
Figure 14 is the structure chart of pilot tone generating unit 25, is to generate to process according to the 1st pilot tone being illustrated in Figure 3 to generate pilot tone
When structure chart,（A）It is the structure chart being circulated displacement before DFT,（B）It is the knot being circulated displacement after the ifft
Composition.
In Figure 14（A）In, send department of resource management 23 and the pilot tone that the resource allocation information receiving from base station is comprised is given birth to
Become, send required parameter（CAZAC sequence number, sequence length, cyclic shift amount, amounts of frequency offset）Input various pieces.
CAZAC sequence generating unit 11 produces indicated CAZAC sequence ZC with sequence length L, sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 makes CAZAC sequence ZCk（n）C sample indicated by cyclic shift, by the ZC obtainingk（N-c）
Input DFT portion 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 portion 13.
NTXSize（NTX=L）DFT portion 13 to pilot tone ZC being inputtedk（N-c）Implement DFT calculation process, produce leading of frequency field
Frequency DFT { ZCk（N-c）}.Subcarrier maps portion 14, according to indicated amounts of frequency offset d, controls the mapping position of pilot tone to enter line frequency
Partially, NFFTSize（NFFT=128）IFFT Department 15 IFFT calculation process is implemented to the subcarrier components that inputted, be converted to time domain
Signal, incoming frame generating unit 26.
Figure 14（B）It is the structure chart of the pilot tone generating unit 25 when being circulated displacement after ifft, cyclic shift portion 12 follows
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 and base station between
Suddenly, send transmission path situation to base station during executing this step.That is, movement station receives shared the leading from base station transmission
Frequency is simultaneously wirelessly measured（SIR or SNR measures）, 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 frequency band according to each and sends shared pilot tone, movement station is for each
Send frequency band wirelessly to be measured, measurement result is sent to base station.Base station obtains transmission path situation from movement station, connects simultaneously
When receiving resource allocation request, the transmission path situation according to this movement station distributes resource, and resource allocation information is sent to movement
Stand.
31 wireless signals receiving from movement station of radio section are converted to baseband signal, separation unit 32 mask datas/control
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 have frequency shown in Figure 24 etc. change structure.
Data processing division 33 demodulates the transmission path situation data sending from movement station when setting up communication linkage, in 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, and the sequence number of CAZAC sequence sending frequency band, being used as pilot tone and the sequence that also comprise pilot tone are long
Degree L, cyclic shift amount, amounts of frequency offset d etc..Downstream signal baseband processing section 36 time division multiplex downlink data and control information and resource
Distribution information, and send from radio section 31.
After movement station receives resource allocation information, carry out in Figure 13, process illustrated in fig. 14, send by data and lead
The frame that frequency is constituted.
Channel estimation unit 34 is estimated using the pilot tone separating and inputting in separation unit 32, the 1st channel being illustrated in Figure 6
Meter is processed, 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
Distribute information instruction unit 35b with link.
Figure 16 is the structure chart of channel estimation unit 34, to label identical with Fig. 6 identical part mark.
DFT portion 51 implements DFT calculation process to the pilot signal inputting from separation unit 32, and is converted to leading of frequency field
Frequency signal（Subcarrier components p1～p12）.Subcarrier components p12 of non-overlapping copies are added by subcarrier addition portion 52 with p1, will
Addition result is as subcarrier components p1 of new sub-carrier frequencies f1.
Copy signal qi of pilot tone is multiplied with receiving pilot signal pi by copy signal multiplication portion 53 for each subcarrier,
IDFT portion 54 implements IDFT calculation process, the pilot signal of output time-domain to copy multiplied result.Contours extract portion 55 is according to t=
（C1+c2）/ 2 separate IDFT output signal, if from the receipt signal of user 1, then selecting profile PRF1（With reference to Fig. 6）,
DFT portion 56 implements DFT computing to profile PRF1, exports channel estimation value h1～h11.On the other hand, if from user's 2
Receipt signal, contours extract portion 55 selects profile PRF2, and DFT portion 56 implements DFT computing to profile PRF2, exports channel estimation value
H2～h12.
（D）2nd pilot tone generating unit and channel estimation unit
Figure 17（A）The 2nd pilot tone being by being illustrated in Figure 7 generates the structure chart of the pilot tone generating unit processing, to figure
14（A）Pilot tone generating unit identical part mark identical label.It is a difference in that and executed based on frequency by subcarrier maps portion 14
This two actions of the duplication of the weight of pilot frequency of the subcarrier maps of deviator d and pre- subcarrier, other actions are identical.
CAZAC sequence generating unit 11 produces indicated CAZAC sequence ZC with sequence length L, sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 is by CAZAC sequence ZCk（n）C sample indicated by cyclic shift, by the ZC obtainingk（N-c）
Input DFT portion 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 portion 13.NTXSize（NTX=L）DFT portion 13 to pilot tone ZC being inputtedk（N-c）Implement DFT computing
Process, produce the pilot tone DFT { ZC of frequency fieldk（N-c）}.
Subcarrier maps portion 14, according to from the Copy Info sending department of resource management 23 instruction and frequency deviation information, carries out sub- load
Ripple maps.For example, to Fig. 7（B）The pilot tone 1 of user 1 carry out Fig. 8（A）Shown subcarrier maps are processed, to Fig. 7（C）Use
The pilot tone 2 at family 2 carries out Fig. 8（B）Shown subcarrier maps are processed.NFFTSize（Such as NFFT=128）IFFT Department 15 to institute
The subcarrier components of input implement IFFT calculation process, are converted to the pilot signal of time domain, incoming frame generating unit 26.
Figure 17（B）Be by the structure chart of the channel estimation unit 34 of the 2nd channel estimation process being illustrated in Figure 9, to
The channel estimation unit identical part of Figure 16 marks identical label.It is a difference in that and delete subcarrier addition portion 52 and pair
The multiplication in this signal multiplication portion 53 is processed.
DFT portion 51 implements DFT calculation process for the pilot signal inputting from separation unit 32, is converted to leading of frequency field
Frequency signal（Subcarrier components p1～p12）.If copy signal multiplication portion 53 receives the pilot tone 1 from user 1, will be from
The subcarrier f of the reception pilot tone of DFT portion 51 outputi、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 exporting from DFT portion 51I+1、
fI+2、fI+3、、、fI+11Component p2～p12 be multiplied with copy signal.
Then, IDFT portion 54 implements IDFT calculation process, the delayed profile of output time-domain to copy multiplied result.Profile carries
Take portion 55 according to t=（C1+c2）/ 2 separate IDFT output signal, if from the pilot signal of user 2, then selecting profile
PRF1（With reference to Fig. 6）, DFT portion 56 implements DFT computing to profile PRF1, exports channel estimation value h1～h11.On the other hand, such as
Fruit is the receipt signal from user 1, and contours extract portion 55 selects profile PRF2, and DFT portion 56 implements DFT fortune to profile PRF2
Calculate, export channel estimation value h2～h12.
（E）3rd pilot tone generating unit and channel estimation unit
Figure 18（A）The 3rd pilot tone being by being illustrated in Figure 11 generates the structure chart of the pilot tone generating unit processing, to figure
14（A）Pilot tone generating unit identical part mark identical label.It is a difference in that and added polarity appendix 61, other actions
Identical.
CAZAC sequence generating unit 11 produces indicated CAZAC sequence ZC with sequence length L, sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 is by CAZAC sequence ZCk（n）C sample indicated by cyclic shift, by the ZC obtainingk（N-c）
Input DFT portion 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 portion 13.NTXSize（NTX=L）DFT portion 13 to pilot tone ZC being inputtedk（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 sending department of resource management 23 instruction.Polarity
Appendix 61 will be attached to the output in subcarrier maps portion 14 by the polarity that transmission department of resource management 23 indicates, inputs IFFT Department
15.For example, if the pilot tone 1 of user 1, due to the polarity of instruction+1 in the 1st, the 2nd pilot blocks（With reference to Figure 11（B）、
（D））, so polarity appendix 61 is multiplied by+1 to all carrier components exporting from subcarrier maps portion 14, input IFFT Department
15.And, if the pilot tone 2 of user 2, due to indicating+1 polarity in the 1st pilot blocks, in the 2nd pilot blocks middle finger
Show -1 polarity（With reference to Figure 11（C）、（E））, so polarity appendix 61 is directed to all loads from subcarrier maps portion 14 output
Wave component, is multiplied by+1 and inputs IFFT Department 15 to the 1st pilot blocks, is multiplied by -1 and inputs IFFT Department 15 to the 2nd pilot blocks.
NFFTSize（NFFT=128）IFFT Department 15 subcarrier components that inputted are implemented with IFFT calculation process, conversion
For the pilot signal of time domain, incoming frame generating unit 26.
Figure 18（B）Be by the structure chart of the channel estimation unit 34 of the 3rd channel estimation process being illustrated in Figure 12, to
The channel estimation unit identical part of Figure 16 marks identical label.It is a difference in that replacement in subcarrier addition portion 62 between setting block
Carrier wave addition portion 52.
DFT portion 51 implements DFT calculation process to the pilot signal of the 1st pilot blocks inputting from separation unit 32, is converted to frequency
The pilot signal in rate region（Subcarrier components p1～p12）, this pilot signal of 62, subcarrier addition portion between block（Subcarrier components
P1～p12）It is saved in built-in memory.Then, DFT portion 51 believes to the pilot tone of the 2nd pilot blocks inputting 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, each subcarrier will be preserved
The 1st pilot blocks pilot signal（Subcarrier components p1～p12）Pilot signal with the 2nd pilot blocks（Subcarrier components p1～
p12）It is added.Thus, remove be re-used from other users（Such as user 2）Pilot signal component.And, son carries between block
If ripple addition portion 62 receives the pilot tone 2 from user 2, for each subcarrier leading from the 1st pilot blocks being preserved
Frequency signal（Subcarrier components p1～p12）Deduct the pilot signal of the 2nd pilot blocks（Subcarrier components p1～p12）.Thus, remove
Be re-used 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 the subcarrier f of the reception pilot tone exporting subcarrier addition portion 62 between blockI+1、
fI+2、fI+3、、、fI+11Component p2～p12 be multiplied with copy signal q1～q11.
Then, IDFT portion 54 implements IDFT calculation process, the pilot signal of output time-domain to copy multiplied result.Profile carries
Take portion 55 according to t=（C1+c2）/ 2 separate IDFT output signal, if from the pilot signal of user 1, then selecting profile
PRF1（With reference to Fig. 6）, DFT portion 56 implements DFT computing to profile PRF1, exports channel estimation value h1～h11.On the other hand, such as
Fruit is the receipt signal from user 2, and contours extract portion 55 selects profile PRF2, and DFT portion 56 implements DFT fortune to profile PRF2
Calculate, export channel estimation value h2～h12.
（F）Self Adaptive Control
As previously described, by the uplink resource management portion 35 of base station（Figure 15）Transmission path feelings according to movement station
Condition, determines transmission frequency band, CAZAC sequence number and sequence length L, cyclic shift amount, frequency deviation d etc. of pilot tone, notifies to movement station.
And, the uplink resource management portion 35 of base station is also according to the transmission path situation of each movement station, determines and send in frequency band
Multiplexing number.
Figure 19 is the frequency distribution explanatory diagram that multiplexing number is when 4, user 1 is distributed with initial 12 subcarrier, to user 2
Distribute the 2nd 12 subcarriers, distribute the 3rd 12 subcarriers to user 3, user 4 is distributed with last 12 subcarriers, at this
In the case of kind, change cyclic shift amount and carry out CAZAC sequence ZC using sequence length L=19k（n）, leading as each user
Frequently.
The frequency deviation of pilot tone is configured to the data is activation frequency bandwidth for covering each user as much as possible.Cyclic shift meter
Calculation portion 35a（Figure 15）Calculate the cyclic shift amount of each user according to following formula.
ci=cp- s (k, d, L) (9)
Wherein, i, p represent data is activation band number and user's sequence number respectively.And, s（k、d、L）Represent according to sequence
The cyclic shift amount that number k, sequence length L, frequency deviation produce, the relation shown in following formula is set up.
K s (k, d, L) ≡ d (modL) (10)
The c of p-th userpFor example can 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～
Cyclic shift amount c of user 41～c4As follows.
c1=0
c2=[L/4]
c3=[2·L/4]-s(k,d,L)
c4Two [3 L/4] s (k, d, L)
But, sometimes according to the reception mode of pilot signal, the channel estimation characteristic at the transmission frequency band two ends of pilot tone deteriorates,
The channel estimation characteristic of mid portion 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 in the transmission frequency band of subcarrier 13～24,25～36, precision of channel estimation is good.
Therefore, for the user that transmission path is in bad order, preferentially distribute sending out of middle subcarrier 13～24,25～36
Send frequency band, for all right user of transmission path, distribute the transmission frequency band of the subcarrier 1～12,37～48 of both sides.This
Sample, eliminates the extreme user deteriorating of precision of channel estimation.Figure 19 illustrates and distribute middle transmission to user 2, user 3
The example of frequency band.
And it is possible to carry out control as shown in Figure 20, Figure 21（Jump controls）, the switching of each frame is distributed to each
The transmission frequency band of user.Figure 20 is the distribution explanatory diagram in odd number frame, and Figure 21 is the distribution explanatory diagram in even number frame.
In odd number frame, as shown in figure 20, the subcarrier 1～12,37～48 to user 1, user 4 distribution both sides,
Distribute middle subcarrier 13～24,25～36 to user 2, user 3.And, it is in even number frame, as shown in figure 21, right
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, the pilot tone to user 3, user 4 is multiplied by frequency deviation, in even number frame, to user
1st, the pilot tone of user 2 is multiplied by frequency deviation.This eliminates the extreme user deteriorating of precision of channel estimation.
Figure 22 be by jump control when pilot tone generating unit structure chart, to Figure 14（A）Pilot tone generating unit identical
Part mark identical label.It is a difference in that and has added frequency deviation switch control portion 71, other actions are identical.
CAZAC sequence generating unit 11 produces indicated CAZAC sequence ZC with sequence length L, sequence numberk（n）Make
For pilot tone, cyclic shift portion 12 makes CAZAC sequence ZCk（n）C sample indicated by cyclic shift, by the ZC obtainingk（N-c）
Input DFT portion 13.NTXSize（NTX=L）DFT portion 13 to pilot tone ZC being inputtedk（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 the frequency deviation being indicated by transmission department of resource management 23
Amount d and dancing mode, it is determined whether frequency deviation to be carried out.Subcarrier maps portion 14 is according to whether frequency deviation to be carried out is carrying out subcarrier
Mapping.NFFTSize（NFFT=128）IFFT Department 15 IDFT calculation process is implemented to the subcarrier components that inputted, when being converted to
The pilot signal in domain, incoming frame generating unit 26.
The effect of invention
According to the present invention as described hereinbefore, can accurately carry out deviateing the data is activation subcarrier that pilot tone sends frequency band
Channel estimation.
And, according to the present invention, even if using to predetermined sequence（Such as CAZAC sequence ZCk（n））Implement not same amount
Cyclic shift after result as the user that will be multiplexed pilot tone it is also possible to accurately be allocated to each user's
The channel estimation of subcarrier.
And, according to the present invention, even if being used as to incite somebody to action predetermined sequence is implemented with the result after different amounts of cyclic shift
The pilot tone of user to be multiplexed, it is also possible to separate the pilot tone of each user using simple method, carries out channel estimation.
And, according to the present invention, distribute the transmission frequency band of pilot tone by the user priority bad to transmission path situation
Mid portion, even the bad user of transmission path situation is it is also possible to improve the channel of the data is activation subcarrier of this user
Estimated accuracy.
And, according to the present invention, make to distribute to the data transmission frequency band of user pilot tone send frequency band mid portion and
Jump in marginal portion, even the bad user of transmission path situation is it is also possible to improve the transmission data subcarrier of this user
Precision of channel estimation.
Claims (3)
1. a kind of wireless communications method, sends the data-signal of user using subcarrier group, and for the multiplexing of this data-signal
Being transmitted, described wireless communications method is characterised by the pilot signal of this user,
The pilot signal of this user comprises：The part being generated by Zadoff-Chu sequence for this user；And by this partly in
Lowest band side subcarrier frequency components replicate become pilot subcarrier sets highest frequency band side subcarrier frequency components
Obtained from part.
2. the user terminal in a kind of wireless communication system, in described wireless communication system, from each user terminal, using son
Carrier wave set sends the data-signal of user, and the pilot signal being multiplexed this user for this data-signal to be transmitted, institute
State user terminal to be characterised by,
The pilot signal of this user comprises：The part being generated by Zadoff-Chu sequence for this user；And by this partly in
Lowest band side subcarrier frequency components replicate become pilot subcarrier sets highest frequency band side subcarrier frequency components
Obtained from part.
3. a kind of wireless base station, this wireless base station receives the data of the user sending using subcarrier group from each user terminal,
And receive the pilot signal of the user for this data-reusing, described wireless base station is characterised by,
The pilot signal of this user comprises：The part being generated by Zadoff-Chu sequence for this user；And by this partly in
Lowest band side subcarrier frequency components replicate become pilot subcarrier sets highest frequency band side subcarrier frequency components
Obtained from part.
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| CN201310118761.2A CN103220113B (en) | 2006-12-22 | 2006-12-22 | Wireless communication method, base station and user terminal |
| CN2006800565392A CN101554027B (en) | 2006-12-22 | 2006-12-22 | Wireless communication method, base station, and user terminal |
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| CN103220113B true CN103220113B (en) | 2017-02-22 |
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| US5469115A (en) * | 1994-04-28 | 1995-11-21 | Qualcomm Incorporated | Method and apparatus for automatic gain control in a digital receiver |
| JP3522619B2 (en) * | 2000-01-05 | 2004-04-26 | 株式会社エヌ・ティ・ティ・ドコモ | Transmitter in multi-carrier CDMA transmission system |
| JP3694479B2 (en) * | 2001-12-07 | 2005-09-14 | 松下電器産業株式会社 | Multi-carrier transceiver apparatus, multi-carrier wireless communication method, and multi-carrier wireless communication program |
| AU2003221423A1 (en) * | 2002-03-29 | 2003-10-13 | Matsushita Electric Industrial Co., Ltd. | Method of data retransmission in multi-carrier transmission and communication apparatus having data retransmission control device |
| CN100574160C (en) * | 2002-12-02 | 2009-12-23 | 株式会社Ntt都科摩 | Orthogonal frequency multicarrier transmitter apparatus and sending method |
| DE602004027322D1 (en) * | 2003-01-31 | 2010-07-08 | Ntt Docomo Inc | transmission synchronization |
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