CN106453184A - Frequency offset estimation method and device - Google Patents

Frequency offset estimation method and device Download PDF

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Publication number
CN106453184A
CN106453184A CN201610714691.0A CN201610714691A CN106453184A CN 106453184 A CN106453184 A CN 106453184A CN 201610714691 A CN201610714691 A CN 201610714691A CN 106453184 A CN106453184 A CN 106453184A
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Prior art keywords
subcarrier
ofdm symbol
transmission power
power
subcarriers
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CN201610714691.0A
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CN106453184B (en
Inventor
许炜阳
李有均
徐弘乾
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Chongqing University
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Chongqing University
Shenzhen Tinno Wireless Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

Abstract

An embodiment of the invention provides a frequency offset estimation method, and relates to the field of wireless communication. The frequency offset can be estimated by adjusting the transmitted power of subcarriers in OFDM symbols to be sent and inspecting the distribution of the subcarriers at a receiving end. The method comprises the following steps: adjusting the transmitted power of Tth subcarriers of two adjacent OFDM symbols, wherein T is an integer which is not smaller than 1 and not greater than N, and N is the total number of subcarriers; transmitting the subcarriers according to the power after adjustment; collecting the received power of all the subcarriers of the two adjacent OFDM symbols; and calculating the estimated frequency offset according to the received power of all the subcarriers of the two adjacent OFDM symbols. The technical scheme provided by the embodiment of the invention can be applied to the blind estimation process of integer frequency offset of a single-input single-output (SISO) OFDM system, a multiple-input multiple-output (MIMO) OFDM system, and the like.

Description

A kind of method and device of offset estimation
【Technical field】
The present invention relates to wireless communication field, more particularly, to a kind of method and device of offset estimation.
【Background technology】
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology conduct A kind of Radio Transmission Technology of high speed, has the advantages that mitigating frequency-selective fading and arrowband interference, supports high-rate information transmission, It is widely applied in the field such as WLAN and digital audio-video-frequency broadcast.Due to Receiver And Transmitter in OFDM technology Oscillator mismatches and the time-varying characteristics of environment make it more sensitive to carrier wave frequency deviation.Integer frequency bias can make demodulated signal occur So that the bit error rate of system is 50%, therefore receiver needs integer frequency bias are corrected cyclic shift.Prior art is general It is that blind estimate compensation is carried out to integer frequency bias by the unloaded ripple of transmission.
In realizing process of the present invention, inventor finds that in prior art, at least there are the following problems：
According to existing frequency deviation estimating method, during carrying out blind estimate compensation to integer frequency bias, need transmission unloaded Ripple, this occupies certain bandwidth, impact regular traffic transmission.
【Content of the invention】
In view of this, embodiments provide a kind of method and device of offset estimation, to be sent by adjusting The transmission power of OFDM symbol sub-carriers, the distribution situation investigating subcarrier in receiving terminal draws offset estimation value.
In a first aspect, embodiments providing a kind of method of offset estimation, methods described includes：
The transmission power of the OFDM symbol respective T subcarrier adjacent to two carries out power adjustment, T be not less than 1 and the no more than integer of N, N is total number of sub-carriers；
According to each subcarrier of power emission after adjustment；
Gather the receiving power of all subcarriers of described two adjacent OFDM symbol；
According to the receiving power of all subcarriers of described two adjacent OFDM symbol, it is calculated offset estimation value.
Second aspect, embodiments provides a kind of method of offset estimation, and methods described includes：
The transmission power of respective at least two subcarriers of the OFDM symbol adjacent to two carries out power adjustment, described extremely Few two subcarriers include b1 to bJ subcarrier, and b1 to bJ is not less than the 1 and no more than integer of N, J be not less than 1 and The Integer N being not more than N is total number of sub-carriers；
According to each subcarrier of power emission after adjustment；
Gather the receiving power of all subcarriers of described two adjacent OFDM symbol；
According to the receiving power of all subcarriers of described two adjacent OFDM symbol, it is calculated offset estimation value.
The third aspect, embodiments provides a kind of method of offset estimation, and methods described includes：
Power adjustment, described company are carried out to the transmission power of respective at least two subcarriers of continuous even number OFDM symbol Continuous even number OFDM symbol includes m1 to mzOFDM symbol, and described at least two subcarriers include b1 to bJ son and carry Ripple, b1 to bJ is not less than the 1 and no more than integer of N, and J is not less than the 1 and no more than integer of N, and N is total number of sub-carriers, and z is It is not more than OFDM symbol sum；
According to each subcarrier of power emission after adjustment；
Gather the receiving power of all subcarriers of OFDM symbol of described continuous even number；
The receiving power of all subcarriers of OFDM symbol according to described continuous even number, is calculated offset estimation value.
Fourth aspect, embodiments provides a kind of device of offset estimation, and described device includes：
Adjustment unit, the transmission power for the OFDM symbol respective T subcarrier adjacent to two carries out power Adjustment, T is not less than the 1 and no more than integer of N, and N is total number of sub-carriers；
Transmitter unit, for according to each subcarrier of power emission after adjustment；
Collecting unit, for gathering the receiving power of all subcarriers of described two adjacent OFDM symbol；
Computing unit, for the receiving power according to all subcarriers of described two adjacent OFDM symbol, is calculated Offset estimation value.
5th aspect, embodiments provides a kind of device of offset estimation, and described device includes：
Adjustment unit, the transmission power for OFDM symbol respective at least two subcarriers adjacent to two carries out work( Rate adjusts, and described at least two subcarriers include b1 to bJ subcarrier, and b1 to bJ is not less than the 1 and no more than integer of N, J is not less than the 1 and no more than integer of N, and N is total number of sub-carriers；
Transmitter unit, for according to each subcarrier of power emission after adjustment；
Collecting unit, for gathering the receiving power of all subcarriers of described two adjacent OFDM symbol；
Computing unit, for the receiving power according to all subcarriers of described two adjacent OFDM symbol, is calculated Offset estimation value.
6th aspect, embodiments provides a kind of device of offset estimation, and described device includes：
Adjustment unit, for carrying out work(to the transmission power of respective at least two subcarriers of continuous even number OFDM symbol Rate adjusts, and described continuous even number OFDM symbol includes m1 to mzOFDM symbol, and described at least two subcarriers include the B1 to bJ subcarrier, b1 to bJ is not less than the 1 and no more than integer of N, and J is not less than the 1 and no more than integer of N, and N is son Total number subcarriers, z is the integer of no more than OFDM symbol sum；
Transmitter unit, for according to each subcarrier of power emission after adjustment；
Collecting unit, for gathering the receiving power of all subcarriers of OFDM symbol of described continuous even number；
Computing unit, for the receiving power of all subcarriers of OFDM symbol according to described continuous even number, calculates To offset estimation value.
A kind of method and device of offset estimation provided in an embodiment of the present invention, by adjusting in OFDM symbol to be sent The transmission power of subcarrier, the distribution situation investigating these subcarriers after receiving terminal DFT can draw frequency Partially estimate.This frequency deviation estimating method does not need to transmit unloaded ripple or pilot tone, saves system effect bandwidth.Many by selecting Obtaining channel diversity and to participate in offset estimations using multiple OFDM symbol, the method that improves is under multipath channel for individual subcarrier Performance so that the precision of offset estimation is higher.
【Brief description】
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be attached to use required in embodiment Figure be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this area For those of ordinary skill, without having to pay creative labor, can also be other attached according to the acquisition of these accompanying drawings Figure.
Fig. 1 is a kind of method flow diagram of offset estimation provided in an embodiment of the present invention；
Fig. 2 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 3 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 4 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 5 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 6 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 7 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 8 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Fig. 9 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Figure 10 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Figure 11 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Figure 12 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Figure 13 is the method flow diagram of another kind offset estimation provided in an embodiment of the present invention；
Figure 14 is a kind of composition frame chart of the device of offset estimation provided in an embodiment of the present invention；
Figure 15 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 16 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 17 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 18 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 19 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 20 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 21 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 22 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 23 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 24 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 25 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention；
Figure 26 is the composition frame chart of the device of another kind offset estimation provided in an embodiment of the present invention.
【Specific embodiment】
In order to be better understood from technical scheme, below in conjunction with the accompanying drawings the embodiment of the present invention is retouched in detail State.
It will be appreciated that described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Base Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work all its Its embodiment, broadly falls into the scope of protection of the invention.
The term using in embodiments of the present invention is the purpose only merely for description specific embodiment, and is not intended to be limiting The present invention." a kind of ", " described " and " being somebody's turn to do " of singulative used in the embodiment of the present invention and appended claims It is also intended to including most forms, unless context clearly shows that other implications.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation of description affiliated partner, represent There may be three kinds of relations, for example, A and/or B, can represent：, there is A and B in individualism A simultaneously, individualism B these three Situation.In addition, character "/" herein, typically represent forward-backward correlation to as if a kind of relation of "or".
Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ... When " or " in response to determining " or " in response to detection ".Similarly, depending on linguistic context, phrase " if it is determined that " or " if detection (condition of statement or event) " can be construed to " when determining " or " in response to determining " or " when the detection (condition of statement Or event) when " or " in response to detecting (condition of statement or event) ".
Embodiments provide a kind of method of offset estimation, can be applied to including single-input single-output (SISO) during blind estimate being carried out to integer frequency bias in the system such as-OFDM and multiple-input and multiple-output MIMO-OFDM, such as Fig. 1 Shown, methods described includes：
The transmission power of the 101st, adjacent to the two respective T subcarrier of OFDM symbol carries out power adjustment.
Wherein, T is not less than the 1 and no more than integer of N, and T can use arbitrary value in scope, and N is total number of sub-carriers, hereinafter T and N occurs and all does this explanation.
Wherein, described OFDM symbol is that after sub-carrier carries out Fast Fourier Transform (FFT), its discrete sample value is constituted, should Each of symbol sample value all contains all subcarrier information.
102nd, according to each subcarrier of power emission after adjustment.
Where it is assumed that during transmitting subcarrier, channel kept not within the duration of two adjacent OFDM symbol Become.
103rd, gather the receiving power of all subcarriers of described two adjacent OFDM symbol.
104th, the receiving power according to all subcarriers of described two adjacent OFDM symbol, is calculated offset estimation Value.
A kind of method of offset estimation provided in an embodiment of the present invention, by adjusting OFDM symbol sub-carriers to be sent Transmission power, the distribution situation investigating these subcarriers after receiving terminal DFT can show that frequency deviation is estimated Meter.This frequency deviation estimating method does not need to transmit unloaded ripple or pilot tone, saves system effect bandwidth.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How the transmission power of the OFDM symbol respective T subcarrier adjacent to two carries out the concrete steps of power adjustment, Realization for step 101 provides flow process in detail below, as shown in Fig. 2 including：
1011st, the transmission power of T subcarrier of the first OFDM symbol is adjusted to more than described first OFDM symbol The all subcarriers of other transmission power, obtain the first transmission power.
Wherein, the transmission power of T subcarrier of described first OFDM symbol is designated as dm,T, described first transmission power It is β dm,T.
Wherein, m refers to the sequence number number of OFDM symbol, and β refers to the power amplification factor, m and β hereinafter and all does this Explain.
1012nd, the transmission power of T subcarrier of the second OFDM symbol is adjusted to less than described second OFDM symbol The all subcarriers of other transmission power, obtain the second transmission power.
Wherein, the transmission power of T subcarrier of described second OFDM symbol is dm+1,T, described second transmission power is dm+1,T/β.
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
It should be noted that the value of described power amplification factor-beta and 1/ β is relative, the value of β is not limited, So the factor that β can also reduce as power.
Furthermore, it is understood that on the basis of preceding method flow process, the general power in order to ensure each OFDM symbol does not occur Change, in the alternatively possible implementation of the embodiment of the present invention, additionally provides how to removing institute in each OFDM symbol State the power regulating method of the other subcarriers outside the T subcarrier, as shown in figure 3, including
1013rd, the power difference of the specified transmission power of single OFDM and described first transmission power is averagely allocated to Other subcarriers in addition to described the T subcarrier in the subcarrier of the first OFDM symbol.
Wherein, in the subcarrier of described first OFDM symbol the other subcarriers in addition to described the T subcarrier transmitting Power is dm,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, k refers to the sequence number number of subcarrier in OFDM symbol, is not less than the 1 and no more than integer of N, hereinafter K occurs and all makees this explanation.
Wherein, the d arriving described abovem,TAnd dm,kRefer to the transmitting of data on each subcarrier of the first OFDM symbol Power, is traditionally arranged to be identical.
1014th, the power difference of the specified transmission power of single OFDM and described second transmission power is averagely allocated to Other subcarriers in addition to described the T subcarrier in the subcarrier of the second OFDM symbol.
Wherein, in the subcarrier of described second OFDM symbol the other subcarriers in addition to described the T subcarrier transmitting Power is dm+1,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, the d arriving described abovem+1,TAnd dm+1,kRefer to data on each subcarrier of the second OFDM symbol Transmission power, is traditionally arranged to be identical.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How the receiving power according to described two adjacent OFDM symbol all subcarriers, is calculated the concrete of offset estimation value Step, the realization for step 104 provides flow process in detail below, as shown in figure 4, including：
1041st, frequency deviation discreet value and cost function are obtained.
Wherein, described frequency deviation discreet value refers to the integer frequency bias estimate of routine.
Wherein, described cost function is related to the sub-carrier power ratio of adjacent OFDM symbol after adjustment.
1042nd, according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation discreet value with And cost function, it is calculated offset estimation value.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How to obtain the concrete steps of cost function, realization for step 1041 provides flow process in detail below, including：
Step 1, the symbol d after power distributionmAnd dm+1By transmission, carry out the conventional integer frequency of conventional method Offset compensation, the receipt signal after compensation is：
Wherein, described ofdm system adopts constant envelope modulation.
Wherein, υ represents integer frequency bias actual value,Represent is that (i.e. conventional integer frequency bias are estimated for integer frequency bias discreet value Value), L is the length of Cyclic Prefix, and W represents inverse discrete Fourier transform (IDFT) matrix, and all symbols hereinafter occur all Make this explanation.
Wherein, Φ and H represents frequency deviation matrix and channel frequency response matrix respectively：
Φ (υ)=diag { 1, ej2πυ/N,…,ej2π(N-1)υ/N}
H=diag { Hm,0,Hm,1,…,Hm,N-1}.
Wherein, wmRepresent white Gaussian noise.
The power ratio of receipt signal after step 2, the described compensation of calculating, in the case that integer frequency bias are correctly compensated (i.e.), the data being modulated onto on k-th subcarrier is still demodulated to k-th subcarrier, the reception letter after compensation Number there is following relational expression：
Wherein, ignore w during the power ratio of receipt signal after calculating described compensationmImpact.
Wherein, after described compensation, the relational expression of receipt signal can not become in the case of correctly being compensated in integer frequency bias Vertical.
Step 3, according to above detailed process, derive the cost function of method：
Wherein, the integer frequency bias estimate being drawn according to the technical program that σ refers to.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation discreet value and cost letter Number, is calculated the concrete steps of offset estimation value, the realization for step 1042 provides flow process in detail below, including：
Step 1, maximization cost function obtain offset estimation value.
Wherein, when described frequency deviation discreet valueDuring equal to described frequency deviation actual value υ, cost function obtains maximum, so Bigization cost function is estimated that offset estimation value, is represented by with formula：
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How the receiving power according to described two adjacent OFDM symbol all subcarriers, is calculated the concrete of offset estimation value Step, is also the simplification further to step 1041 and step 1042, and the calculating process of offset estimation value σ is not related to frequency deviation and estimates ValueRealization for step 104 provides flow process in detail below, as shown in figure 5, including：
1043rd, calculate the reception work(of k-th subcarrier in k-th subcarrier and the second OFDM symbol in the first OFDM symbol Rate ratio.
Wherein, the computational methods of described receiving power ratio are similar with step 2 with step 1 in step 1041.
Wherein, in described first OFDM symbol in k-th subcarrier and the second OFDM symbol k-th subcarrier reception work( Rate compensates without conventional integer frequency bias, that is,
1044th, according to all receiving power ratios, determine the P subcarrier.
Wherein, in the first OFDM symbol in P subcarrier and the second OFDM symbol P subcarrier received power ratio It is worth for the maximum in all receiving power ratios.
Wherein, P refers to the sequence number number of subcarrier in OFDM symbol, is not less than the 1 and no more than integer of N.
Wherein, whenWhen obtaining maximum, k=P.
1045th, the absolute value according to P and T difference, determines described offset estimation value.
Wherein, the offset estimation value of N number of subcarrier is all designated as P-T, after that is, the frequency of sub-carrier P and T is normalized Difference, be represented by with formula：
Wherein, k ∈ [0, N-1].
A kind of method of offset estimation provided in an embodiment of the present invention, by adjusting OFDM symbol sub-carriers to be sent Transmission power, the distribution situation investigating these subcarriers after receiving terminal DFT can show that frequency deviation is estimated Meter.This frequency deviation estimating method does not need to transmit unloaded ripple or pilot tone, saves system effect bandwidth.
Embodiments provide a kind of method of offset estimation, can be applied to including single-input single-output (SISO) during blind estimate being carried out to integer frequency bias in the system such as-OFDM and multiple-input and multiple-output MIMO-OFDM, such as Fig. 6 Shown, methods described includes：
201st, the transmission power of respective at least two subcarriers of the OFDM symbol adjacent to two carries out power adjustment.
Wherein, described at least two subcarriers include b1 to bJ subcarrier, and b1 to bJ is not less than 1 and no more than N Integer, J is not less than the 1 and no more than integer of N, appear below related represent all make this explanation.
202nd, according to each subcarrier of power emission after adjustment.
Where it is assumed that during transmitting subcarrier, channel kept not within the duration of two adjacent OFDM symbol Become.
203rd, gather the receiving power of all subcarriers of described two adjacent OFDM symbol.
204th, the receiving power according to all subcarriers of described two adjacent OFDM symbol, is calculated offset estimation Value.
A kind of method of offset estimation provided in an embodiment of the present invention, by adjusting at least two in OFDM symbol to be sent The transmission power of individual subcarrier, the distribution situation investigating these subcarriers after receiving terminal DFT draws frequency deviation Estimate.Adjust the transmission power of at least two subcarriers, make use of the diversity of channel frequency response to resist wireless communication system In multipath effect.When preventing described b1 to bJ subcarrier to be in deep fading, white Gaussian noise is estimated to integer frequency bias Impact, improve the estimated accuracy of method.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How the transmission power of OFDM symbol respective at least two subcarriers adjacent to two carries out the concrete step of power adjustment Suddenly, the realization for step 201 provides flow process in detail below, as shown in fig. 7, comprises：
2011st, the transmission power of the b1 to bJ of the first OFDM symbol subcarrier is all adjusted to the first transmission power.
Wherein, described first transmission power is more than the transmission power of all subcarriers of other of described first OFDM symbol.
Wherein, the transmission power of b1 to bJ subcarrier of described first OFDM symbol is dm,b, described first transmitting work( Rate is β dm,b.
Wherein, the selection of described b1 to bJ subcarrier influences whether the performance of algorithm, needs to follow following three standards Then：
1) choose over the entire frequency band to obtain the channel diversity characteristic of maximum as far as possible.
2) cause error to prevent subcarrier frequency deviation from forming cyclic shift, the distance between the adjacent subcarrier being selected Must be different, that is, meet：
c1=b2-b1
c2=b3-b2…
cJ=b1-bJ
cj-1≠cj, 1≤j≤J.
Wherein, c refers to the difference between two sub- centre carrier frequencies.
3) any two continuously also must be different apart from sum, that is,：
c1+c2≠c3+c4
c3+c4≠c5+c6…
cJ-1+cJ≠c1+c2
I.e. cj-1+cj≠cj+1+cj+2.
2012nd, the transmission power of the b1 to bJ of the second OFDM symbol subcarrier is all adjusted to the second transmission power.
Wherein, described second transmission power is less than the transmission power of all subcarriers of other of described second OFDM symbol.
Wherein, the transmission power of b1 to bJ subcarrier of described second OFDM symbol is dm+1,b, then described second Penetrating power is dm+1,b/β.
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
Furthermore, it is understood that on the basis of preceding method flow process, the general power in order to ensure each OFDM symbol does not occur Change, in the alternatively possible implementation of the embodiment of the present invention, additionally provides how to removing institute in each OFDM symbol State the power regulating method of the other subcarriers outside b1 to bJ subcarrier, as shown in figure 8, including：
2013rd, by the transmitting work(of the specified transmission power of single OFDM and b1 to bJ subcarrier of the first OFDM symbol The power difference of rate sum is averagely allocated to the other in the subcarrier of the first OFDM symbol in addition to b1 to bJ subcarrier Subcarrier.
Wherein, the other subcarriers in addition to described b1 to bJ subcarrier in the subcarrier of described first OFDM symbol Transmission power is dm,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, the d arriving described abovem,bAnd dm,kRefer to the transmitting of data on each subcarrier of the first OFDM symbol Power, is traditionally arranged to be identical.
2014th, by the transmitting work(of the specified transmission power of single OFDM and b1 to bJ subcarrier of the second OFDM symbol The power difference of rate sum is averagely allocated in the subcarrier of the second OFDM symbol in addition to described b1 to bJ subcarrier Other subcarriers.
Wherein, the other subcarriers in addition to described b1 to bJ subcarrier in the subcarrier of described second OFDM symbol Transmission power is dm+1,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, the d arriving described abovem+1,bAnd dm+1,kRefer to data on each subcarrier of the second OFDM symbol Transmission power, is traditionally arranged to be identical.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How the receiving power according to described two adjacent OFDM symbol all subcarriers, is calculated the concrete of offset estimation value Step, the realization for step 204 provides flow process in detail below, as shown in figure 9, including：
2041st, frequency deviation discreet value and described b1 to bJ subcarrier each corresponding cost function are obtained.
Wherein, please join for the concrete steps how obtaining the respective corresponding cost function of described b1 to bJ subcarrier According to the step 1 in step 1041 to step 3.
Wherein, described frequency deviation discreet value refers to the integer frequency bias estimate in conventional OFDM system.
2042nd, according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation discreet value with And described b1 to bJ subcarrier each corresponding cost function, it is calculated offset estimation value.
Wherein, according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation discreet value with And described b1 to bJ subcarrier each corresponding cost function, obtain offset estimation value and can be formulated as：
Wherein, σ ∈ [0, N-1], ΓJ={ b1,b2,…,bJ,b1＜ b2... ＜ bJ＜ N }.
A kind of method of offset estimation provided in an embodiment of the present invention, by adjusting at least two in OFDM symbol to be sent The transmission power of individual subcarrier, the distribution situation investigating these subcarriers after receiving terminal DFT draws frequency deviation Estimate.Adjust the transmission power of at least two subcarriers, make use of the diversity of channel frequency response to resist multipath effect.Prevent When described b1 to bJ subcarrier is in deep fading, the impact that white Gaussian noise is estimated to integer frequency bias, improve method Estimated accuracy.
Embodiments provide a kind of method of offset estimation, can be applied to including single-input single-output (SISO) during blind estimate being carried out to integer frequency bias in the system such as-OFDM and multiple-input and multiple-output MIMO-OFDM, such as Figure 10 Shown, methods described includes：
301st, power adjustment is carried out to the transmission power of respective at least two subcarriers of continuous even number OFDM symbol.
Wherein, described continuous even number OFDM symbol includes m1 to mzOFDM symbol, described at least two subcarriers Including b1 to bJ subcarrier.
Wherein, z is the integer of no more than OFDM symbol sum, hereinafter all makees this explanation.
302nd, according to each subcarrier of power emission after adjustment.
Where it is assumed that during transmitting subcarrier, channel keeps constant within the duration of continuous OFDM symbol.
303rd, gather the receiving power of all subcarriers of OFDM symbol of described continuous even number.
304th, the receiving power of all subcarriers of OFDM symbol according to described continuous even number, is calculated offset estimation Value.
A kind of method of offset estimation provided in an embodiment of the present invention, by adjusting continuous even number OFDM symbol to be sent The transmission power of number respective at least two subcarriers, investigate after receiving terminal DFT these subcarriers point Cloth situation draws offset estimation.Adjust the transmission power of continuous even number OFDM symbol subcarrier it is therefore prevented that removing described b1 extremely When bJ subcarrier outer others subcarrier is in deep fading, the impact that noise is estimated to integer frequency bias, improve method Estimated accuracy.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How power adjustment is carried out to the described transmission power to respective at least two subcarriers of continuous even number OFDM symbol Concrete steps, the realization for step 301 provides flow process in detail below, as shown in figure 11, including：
3011st, the transmission power of the b1 to bJ of m1OFDM symbol subcarrier is all adjusted to the first transmission power.
Wherein, described first transmission power is more than the transmission power of all subcarriers of other of described m1OFDM symbol.
Wherein, the transmission power of b1 to bJ subcarrier of described m1OFDM symbol is dm1,b, described first transmitting Power is β dm1,b.
Wherein, b ∈ [b1, b2 ... bJ].
3012nd, the transmission power of the b1 to bJ of m2OFDM symbol subcarrier is all adjusted to the second transmission power.
Wherein, described second transmission power is less than the transmission power of all subcarriers of other of described m2OFDM symbol.
Wherein, the transmission power of b1 to bJ subcarrier of described m2OFDM symbol is dm2,b, described second transmitting Power is dm2,b/β.
3013rd, the like, until the transmission power of the b1 to bJ of mz-1OFDM symbol subcarrier is all adjusted To z-1 transmission power.
Wherein, described z-1 transmission power is more than the transmitting work(of all subcarriers of other of described mz-1OFDM symbol Rate.
Wherein, the transmission power of b1 to bJ subcarrier of described mz-1OFDM symbol is dmz-1,b, described z-1 Transmission power is β dmz-1,b.
3014th, the transmission power of the b1 to bJ of mzOFDM symbol subcarrier is all adjusted to M transmission power.
Wherein, described z transmission power is less than the transmission power of all subcarriers of other of described mzOFDM symbol.
Wherein, the transmission power of b1 to bJ subcarrier of described mzOFDM symbol is dmz,b, described z transmitting work( Rate is dmz,b/β.
Furthermore, it is understood that on the basis of preceding method flow process, the general power in order to ensure each OFDM symbol does not occur Change, in the alternatively possible implementation of the embodiment of the present invention, the b1 to bJ of mzOFDM symbol son is being carried After the transmission power of ripple is all adjusted to z transmission power, as shown in figure 12, also include：
3015th, by the transmitting work(of the specified transmission power of single OFDM and b1 to bJ subcarrier of m1OFDM symbol The power difference of rate sum is averagely allocated to the other in the subcarrier of m1OFDM symbol in addition to b1 to bJ subcarrier Subcarrier.
Wherein, the other subcarriers in addition to described b1 to bJ subcarrier in the subcarrier of described m1OFDM symbol Transmission power is dm1,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, k refers to the sequence number number of subcarrier in OFDM symbol, k ≠ b.
Wherein, the d arriving described abovem1,bAnd dm1,kRefer to sending out of data on each subcarrier of m1OFDM symbol Penetrate power, be traditionally arranged to be identical.
3016th, by the transmitting work(of the specified transmission power of single OFDM and b1 to bJ subcarrier of m2OFDM symbol The power difference of rate sum is averagely allocated in the subcarrier of m2OFDM symbol in addition to described b1 to bJ subcarrier Other subcarriers.
Wherein, the other subcarriers in addition to described b1 to bJ subcarrier in the subcarrier of described m2OFDM symbol Transmission power is dm2,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, the d arriving described abovem2,bAnd dm2,kRefer to sending out of data on each subcarrier of m2OFDM symbol Penetrate power, be traditionally arranged to be identical.
3017th, the like, until will be individual with the b1 to bJ of mzOFDM symbol for the specified transmission power of single OFDM The power difference of the transmission power sum of subcarrier is averagely allocated to and removes described b1 extremely in the subcarrier of mzOFDM symbol Other subcarriers outside bJ subcarrier.
Wherein, the other subcarriers in addition to described b1 to bJ subcarrier in the subcarrier of described mzOFDM symbol Transmission power is dmz,k, after overpower adjustment, the transmission power of other subcarriers is transformed to
Wherein, the d arriving described abovemz,bAnd dmz,kRefer to sending out of data on each subcarrier of mzOFDM symbol Penetrate power, be traditionally arranged to be identical.
Furthermore, it is understood that combining preceding method flow process, provide in the alternatively possible implementation of the embodiment of the present invention How the receiving power of the OFDM symbol all subcarriers according to described continuous even number, is calculated the tool of offset estimation value Body step, the realization for step 304 provides flow process in detail below, as shown in figure 13, including：
3041st, frequency deviation discreet value and OFDM symbol are obtained to corresponding b1 to bJ subcarrier each corresponding cost Function.
Wherein, described OFDM symbol forms the one of symbol centering to the OFDM adjacent for two in m1 to mzOFDM Individual.
Wherein, described frequency deviation discreet value refers to the integer frequency bias estimate in conventional OFDM system.
It is wherein, described that to obtain OFDM symbol concrete to the respective corresponding cost function of corresponding b1 to bJ subcarrier Step refer to step 1 in step 1041 to step 3.
Wherein, described OFDM symbol logarithm is z/2, can obtain generation for each possible offset estimation value accordingly Valency function is also z/2.
3042nd, according to described OFDM symbol to the receiving power of corresponding all subcarriers, described frequency deviation discreet value and OFDM symbol, to corresponding b1 to bJ subcarrier each corresponding cost function, is calculated offset estimation value.
Wherein, to corresponding b1 to bJ subcarrier, each corresponding cost function is z/2 generation to described OFDM symbol Optimal value in valency function.
Wherein, the optimal value of described cost function is minimum of a value.
Wherein, the deterministic process of the optimal value of described cost function as minimum of a value is as follows：
In conjunction with step 1 in step 1041 to step 3, mOFDM symbol, m+1OFDM symbol are to corresponding b1 to bJ Each corresponding cost function exists individual subcarrierWhen value be：
If not the T subcarrier, but other subcarrier is in deep fading, even if in this case small Noise also can allow denominator go to zero and cause to judge by accident, so when cost function is for optimal value, corresponding functional value should be Little, that is, the optimal value of described cost function is minimum of a value.
Wherein, according to described OFDM symbol to the receiving power of corresponding all subcarriers, described frequency deviation discreet value and OFDM symbol, to corresponding b1 to bJ subcarrier each corresponding cost function, obtains offset estimation value, available formula table It is shown as：
Wherein, σ ∈ [0, N-1], ΓJ={ b1,b2,…,bJ,b1＜ b2... ＜ bJ＜ N }.
Wherein, m ∈ [0,2 ... z-4, z-2].
Wherein it is desired to explanation, m, m+1, m1, m2 ... mz-1, mz all representatives be OFDM symbol sequence number number, in order to The convenience of statement, we used different expression ways.
A kind of method of offset estimation provided in an embodiment of the present invention, by adjusting continuous even number OFDM symbol to be sent The transmission power of number respective at least two subcarriers, investigate after receiving terminal DFT these subcarriers point Cloth situation draws offset estimation.Adjust the transmission power of continuous even number OFDM symbol subcarrier it is therefore prevented that removing described b1 extremely When bJ subcarrier outer others subcarrier is in deep fading, the impact that noise is estimated to integer frequency bias, improve method Estimated accuracy.
Embodiments provide a kind of device of offset estimation, can be used for realizing aforementioned approaches method flow process, its composition As shown in figure 14, including：
Adjustment unit 41, the transmission power for the OFDM symbol respective T subcarrier adjacent to two carries out work( Rate adjusts, and T is not less than the 1 and no more than integer of N, and N is total number of sub-carriers.
Transmitter unit 42, for according to each subcarrier of power emission after adjustment.
Collecting unit 43, for gathering the receiving power of all subcarriers of described two adjacent OFDM symbol.
Computing unit 44, for the receiving power according to all subcarriers of described two adjacent OFDM symbol, calculates To offset estimation value.
Optionally, as shown in figure 15, described adjustment unit 41 includes：
First adjusting module 411, for being adjusted to the transmission power of T subcarrier of the first OFDM symbol more than institute State the transmission power of all subcarriers of other of the first OFDM symbol, obtain the first transmission power.
Second adjusting module 412, for being adjusted to the transmission power of T subcarrier of the second OFDM symbol less than institute State the transmission power of all subcarriers of other of the second OFDM symbol, obtain the second transmission power.
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
Optionally, as shown in figure 16, described adjustment unit 41 also includes：
First distribute module 413, for by the power of the specified transmission power of single OFDM and described first transmission power Difference is averagely allocated to the other subcarriers in the subcarrier of the first OFDM symbol in addition to described the T subcarrier.
Second distribute module 414, for by the power of the specified transmission power of single OFDM and described second transmission power Difference is averagely allocated to the other subcarriers in the subcarrier of the second OFDM symbol in addition to described the T subcarrier.
Optionally, as shown in figure 17, described computing unit 44 includes：
Acquisition module 441, for obtaining frequency deviation discreet value and cost function.
First computing module 442, for according to the receiving power of all subcarriers of described two adjacent OFDM symbol, institute State frequency deviation discreet value and cost function, be calculated offset estimation value.
Optionally, as shown in figure 18, described computing unit 44 also includes：
Second computing module 443, for calculating kth in k-th subcarrier and the second OFDM symbol in the first OFDM symbol The receiving power ratio of individual subcarrier.
First determining module 444, for according to all receiving power ratios, determining the P subcarrier；Wherein, first In P subcarrier and the second OFDM symbol in OFDM symbol, the receiving power ratio of P subcarrier is all receiving powers Maximum in ratio.
Second determining module 445, according to the absolute value of P and T difference, determines described offset estimation value.
A kind of device of offset estimation provided in an embodiment of the present invention, by adjusting OFDM symbol sub-carriers to be sent Transmission power, the distribution situation investigating these subcarriers after receiving terminal DFT can show that frequency deviation is estimated Meter.The device of this offset estimation does not need to transmit unloaded ripple or pilot tone, saves system effect bandwidth.
Embodiments provide a kind of device of offset estimation, can be used for realizing aforementioned approaches method flow process, its composition As shown in figure 19, including：
Adjustment unit 51, the transmission power for OFDM symbol respective at least two subcarriers adjacent to two is carried out Power adjusts, and described at least two subcarriers include b1 to bJ subcarrier, and b1 to bJ is the whole of not less than 1 and no more than N Number, J is not less than the 1 and no more than integer of N, and N is total number of sub-carriers.
Transmitter unit 52, for according to each subcarrier of power emission after adjustment.
Collecting unit 53, for gathering the receiving power of all subcarriers of described two adjacent OFDM symbol.
Computing unit 54, for the receiving power according to all subcarriers of described two adjacent OFDM symbol, calculates To offset estimation value.
Optionally, as shown in figure 20, described adjustment unit 51 includes：
First adjusting module 511, for all adjusting the transmission power of the b1 to bJ of the first OFDM symbol subcarrier To the first transmission power, described first transmission power is more than the transmitting work(of all subcarriers of other of described first OFDM symbol Rate.
Second adjusting module 512, for all adjusting the transmission power of the b1 to bJ of the second OFDM symbol subcarrier To the second transmission power, described second transmission power is less than the transmitting work(of all subcarriers of other of described second OFDM symbol Rate.
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
Optionally, as shown in figure 21, described adjustment unit 51 also includes：
First distribute module 513, for by the b1 to bJ of the specified transmission power of single OFDM and the first OFDM symbol The power difference of the transmission power sum of individual subcarrier is averagely allocated to and removes b1 to bJ in the subcarrier of the first OFDM symbol Other subcarriers outside individual subcarrier.
Second distribute module 514, for by the b1 to bJ of the specified transmission power of single OFDM and the second OFDM symbol The power difference of the transmission power sum of individual subcarrier is averagely allocated to and removes described b1 in the subcarrier of the second OFDM symbol Other subcarriers to outside bJ subcarrier.
Optionally, as shown in figure 22, described computing unit 54 includes：
Acquisition module 541, for obtaining frequency deviation discreet value and described b1 to bJ subcarrier each corresponding cost Function.
Computing module 542, for according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency Discreet value and described b1 to bJ subcarrier each corresponding cost function partially, are calculated offset estimation value.
A kind of device of offset estimation provided in an embodiment of the present invention, by adjusting at least two in OFDM symbol to be sent The transmission power of individual subcarrier, the distribution situation investigating these subcarriers after receiving terminal DFT draws frequency deviation Estimate.Adjust the transmission power of at least two subcarriers, make use of the diversity of channel frequency response to resist multipath effect.Prevent When described b1 to bJ subcarrier is in deep fading, the impact that white Gaussian noise is estimated to integer frequency bias, improve estimation Precision.
Embodiments provide a kind of device of offset estimation, can be used for realizing aforementioned approaches method flow process, its composition As shown in figure 23, including：
Adjustment unit 61, for carrying out to the transmission power of respective at least two subcarriers of continuous even number OFDM symbol Power adjusts, and described continuous even number OFDM symbol includes m1 to mzOFDM symbol, and described at least two subcarriers include B1 to bJ subcarrier, b1 to bJ is not less than the 1 and no more than integer of N, and J is not less than the 1 and no more than integer of N, and N is Total number of sub-carriers, z is the integer of no more than OFDM symbol sum.
Transmitter unit 62, for according to each subcarrier of power emission after adjustment.
Collecting unit 63, for gathering the receiving power of all subcarriers of OFDM symbol of described continuous even number.
Computing unit 64, for the receiving power of all subcarriers of OFDM symbol according to described continuous even number, calculates Obtain offset estimation value.
Optionally, as shown in figure 24, described adjustment unit 61 includes：
First adjusting module 611, for all adjusting the transmission power of the b1 to bJ of m1OFDM symbol subcarrier To the first transmission power, described first transmission power is more than the transmitting work(of all subcarriers of other of described m1OFDM symbol Rate.
Second adjusting module 612, for all adjusting the transmission power of the b1 to bJ of m2OFDM symbol subcarrier To the second transmission power, described second transmission power is less than the transmission power of all subcarriers of other of described m2 symbol.
3rd adjusting module 613, the like, for until by the b1 to bJ of mz-1OFDM symbol subcarrier Transmission power is all adjusted to z-1 transmission power, and described z-1 transmission power is more than other institute of described mz-1OFDM symbol There is the transmission power of subcarrier.
4th adjusting module 614, for all adjusting the transmission power of the b1 to bJ of mzOFDM symbol subcarrier To z transmission power, described z transmission power is less than the transmission power of all subcarriers of other of described mz symbol.
Optionally, as shown in figure 25, described adjustment unit 61 also includes：
First distribute module 615, for by the b1 to bJ of the specified transmission power of single OFDM and m1OFDM symbol The power difference of the transmission power sum of individual subcarrier is averagely allocated to and removes b1 to bJ in the subcarrier of m1OFDM symbol Other subcarriers outside individual subcarrier.
Second distribute module 616, for by the b1 to bJ of the specified transmission power of single OFDM and m2OFDM symbol The power difference of the transmission power sum of individual subcarrier is averagely allocated to and removes described b1 in the subcarrier of m2OFDM symbol Other subcarriers to outside bJ subcarrier.
3rd distribute module 617, the like, for until the specified transmission power of single OFDM is accorded with mzOFDM Number the power difference of the transmission power sum of b1 to bJ subcarrier be averagely allocated to the subcarrier in mzOFDM symbol In other subcarriers in addition to described b1 to bJ subcarrier.
Optionally, as shown in figure 26, described computing unit 64 includes：
Acquisition module 641, each to corresponding b1 to bJ subcarrier for obtaining frequency deviation discreet value and OFDM symbol Self-corresponding cost function, described OFDM symbol forms symbol centering to the OFDM adjacent for two in m1 to mzOFDM One.
Computing module 642, for according to described OFDM symbol to the receiving power of corresponding all subcarriers, described frequency deviation Discreet value and OFDM symbol, to corresponding b1 to bJ subcarrier each corresponding cost function, are calculated offset estimation Value.
A kind of device of offset estimation provided in an embodiment of the present invention, by adjusting continuous even number OFDM symbol to be sent The transmission power of number respective at least two subcarriers, investigate after receiving terminal DFT these subcarriers point Cloth situation draws offset estimation.Adjust the transmission power of continuous even number OFDM symbol subcarrier it is therefore prevented that removing described b1 extremely When bJ subcarrier outer others subcarrier is in deep fading, the impact that noise is estimated to integer frequency bias, improve estimation essence Degree.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description, Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
It should be understood that disclosed system in several embodiments provided by the present invention, apparatus and method are permissible Realize by another way.For example, device embodiment described above is only schematically, for example, described unit Divide, only a kind of division of logic function, actual can have other dividing mode when realizing, for example, multiple units or group Part can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, shown Or the coupling each other that discusses or direct-coupling or communication connection can be by some interfaces, device or unit indirect Coupling or communication connection, can be electrical, mechanical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.The mesh to realize this embodiment scheme for some or all of unit therein can be selected according to the actual needs 's.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to It is that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated list Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form that hardware adds SFU software functional unit is realized.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions with so that a computer Device (can be personal computer, server, or network equipment etc.) or processor (Processor) execution the present invention each The part steps of embodiment methods described.And aforesaid storage medium includes：USB flash disk, portable hard drive, read-only storage (Read- Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. various Can be with the medium of store program codes.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Within god and principle, any modification, equivalent substitution and improvement done etc., should be included within the scope of protection of the invention.

Claims (26)

1. a kind of method of offset estimation is it is characterised in that include：
The transmission power of the OFDM symbol respective T subcarrier adjacent to two carries out power adjustment, T be not less than 1 and It is not more than the integer of N, N is total number of sub-carriers；
According to each subcarrier of power emission after adjustment；
Gather the receiving power of all subcarriers of described two adjacent OFDM symbol；
According to the receiving power of all subcarriers of described two adjacent OFDM symbol, it is calculated offset estimation value.
2. method according to claim 1 is it is characterised in that the respective T of the described OFDM symbol adjacent to two is individual The transmission power of subcarrier carries out power adjustment and includes：
The transmission power of T subcarrier of the first OFDM symbol is adjusted to own more than other of described first OFDM symbol The transmission power of subcarrier, obtains the first transmission power；
The transmission power of T subcarrier of the second OFDM symbol is adjusted to own less than other of described second OFDM symbol The transmission power of subcarrier, obtains the second transmission power；
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
3. method according to claim 2 is it is characterised in that by the transmitting of T subcarrier of the second OFDM symbol Power is adjusted to the transmission power of all subcarriers of other less than described second OFDM symbol, obtain the second transmission power it Afterwards, also include：
The power difference of the specified transmission power of single OFDM and described first transmission power is averagely allocated in an OFDM Other subcarriers in addition to described the T subcarrier in the subcarrier of symbol；
The power difference of the specified transmission power of single OFDM and described second transmission power is averagely allocated in the 2nd OFDM Other subcarriers in addition to described the T subcarrier in the subcarrier of symbol.
4. method according to claim 3 is it is characterised in that according to all subcarriers of described two adjacent OFDM symbol Receiving power, be calculated offset estimation value and include：
Obtain frequency deviation discreet value and cost function；
According to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation discreet value and cost letter Number, is calculated offset estimation value.
5. method according to claim 3 is it is characterised in that according to all subcarriers of described two adjacent OFDM symbol Receiving power, be calculated offset estimation value and include：
Calculate the receiving power ratio of k-th subcarrier in k-th subcarrier and the second OFDM symbol in the first OFDM symbol；
According to all receiving power ratios, determine the P subcarrier；Wherein, P subcarrier and second in the first OFDM symbol In OFDM symbol, the receiving power ratio of P subcarrier is the maximum in all receiving power ratios；
According to the absolute value of P and T difference, determine described offset estimation value.
6. a kind of method of offset estimation is it is characterised in that include：
The transmission power of respective at least two subcarriers of the OFDM symbol adjacent to two carries out power adjustment, and described at least two Individual subcarrier includes b1 to bJ subcarrier, and b1 to bJ is not less than the 1 and no more than integer of N, and J is not less than 1 and less In the integer of N, N is total number of sub-carriers；
According to each subcarrier of power emission after adjustment；
Gather the receiving power of all subcarriers of described two adjacent OFDM symbol；
According to the receiving power of all subcarriers of described two adjacent OFDM symbol, it is calculated offset estimation value.
7. method according to claim 6 is it is characterised in that the described OFDM symbol adjacent to two respective at least two The transmission power of individual subcarrier carries out power adjustment and includes：
The transmission power of the b1 to bJ of the first OFDM symbol subcarrier is all adjusted to the first transmission power, described first Penetrate the transmission power that power is more than all subcarriers of other of described first OFDM symbol；
The transmission power of the b1 to bJ of the second OFDM symbol subcarrier is all adjusted to the second transmission power, described second Penetrate the transmission power that power is less than all subcarriers of other of described second OFDM symbol；
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
8. method according to claim 7 is it is characterised in that by the b1 to bJ of the second OFDM symbol subcarrier After transmission power is all adjusted to the second transmission power, also include：
By the specified transmission power of single OFDM and the transmission power sum of b1 to bJ subcarrier of the first OFDM symbol Power difference is averagely allocated to the other subcarriers in the subcarrier of the first OFDM symbol in addition to b1 to bJ subcarrier；
By the specified transmission power of single OFDM and the transmission power sum of b1 to bJ subcarrier of the second OFDM symbol Power difference is averagely allocated to the other sons in addition to described b1 to bJ subcarrier in the subcarrier of the second OFDM symbol and carries Ripple.
9. method according to claim 8 it is characterised in that described according to all sons of described two adjacent OFDM symbol The receiving power of carrier wave, is calculated offset estimation value and includes：
Obtain frequency deviation discreet value and described b1 to bJ subcarrier each corresponding cost function；
According to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation discreet value and described b1 To bJ subcarrier each corresponding cost function, it is calculated offset estimation value.
10. a kind of method of offset estimation is it is characterised in that include：
Power adjustment, described continuous idol are carried out to the transmission power of respective at least two subcarriers of continuous even number OFDM symbol Several OFDM symbol include m1 to mzOFDM symbol, and described at least two subcarriers include b1 to bJ subcarrier, b1 It is not less than the 1 and no more than integer of N to bJ, J is not less than the 1 and no more than integer of N, and N is total number of sub-carriers, and z is little Integer in OFDM symbol sum；
According to each subcarrier of power emission after adjustment；
Gather the receiving power of all subcarriers of OFDM symbol of described continuous even number；
The receiving power of all subcarriers of OFDM symbol according to described continuous even number, is calculated offset estimation value.
11. methods according to claim 10 are it is characterised in that described respective at least to continuous even number OFDM symbol The transmission power of two subcarriers carries out power adjustment and includes：
The transmission power of the b1 to bJ of m1OFDM symbol subcarrier is all adjusted to the first transmission power, described first Penetrate the transmission power that power is more than all subcarriers of other of described m1OFDM symbol；
The transmission power of the b1 to bJ of m2OFDM symbol subcarrier is all adjusted to the second transmission power, described second Penetrate the transmission power that power is less than all subcarriers of other of described m2 symbol；
The like, until the transmission power of the b1 to bJ of mz-1OFDM symbol subcarrier is all adjusted to z-1 sending out Penetrate power, described z-1 transmission power is more than the transmission power of all subcarriers of other of described mz-1OFDM symbol；
The transmission power of the b1 to bJ of mzOFDM symbol subcarrier is all adjusted to z transmission power, described z transmitting Power is less than the transmission power of all subcarriers of other of described mz symbol.
12. methods according to claim 11 are it is characterised in that by the b1 to bJ of mzOFDM symbol subcarrier Transmission power be all adjusted to z transmission power after, also include：
By the specified transmission power of single OFDM and the transmission power sum of b1 to bJ subcarrier of m1OFDM symbol Power difference is averagely allocated to the other subcarriers in the subcarrier of m1OFDM symbol in addition to b1 to bJ subcarrier；
By the specified transmission power of single OFDM and the transmission power sum of b1 to bJ subcarrier of m2OFDM symbol Power difference is averagely allocated to the other sons in addition to described b1 to bJ subcarrier in the subcarrier of m2OFDM symbol and carries Ripple；
The like, until sending out b1 to bJ subcarrier of the specified transmission power of single OFDM and mzOFDM symbol The power difference penetrating power sum is averagely allocated in the subcarrier of mzOFDM symbol except described b1 to bJ subcarrier Outer other subcarriers.
13. methods according to claim 12 are it is characterised in that all sons of OFDM symbol according to described continuous even number The receiving power of carrier wave, is calculated offset estimation value and includes：
Obtain frequency deviation discreet value and OFDM symbol to corresponding b1 to bJ subcarrier each corresponding cost function, described OFDM symbol to adjacent for two in m1 to mzOFDM OFDM composition symbol to one of；
According to described OFDM symbol to the receiving power of corresponding all subcarriers, described frequency deviation discreet value and OFDM symbol pair Corresponding b1 to bJ subcarrier each corresponding cost function, is calculated offset estimation value.
A kind of 14. devices of offset estimation are it is characterised in that include：
Adjustment unit, the transmission power for the OFDM symbol respective T subcarrier adjacent to two carries out power adjustment, T is not less than the 1 and no more than integer of N, and N is total number of sub-carriers；
Transmitter unit, for according to each subcarrier of power emission after adjustment；
Collecting unit, for gathering the receiving power of all subcarriers of described two adjacent OFDM symbol；
Computing unit, for the receiving power according to all subcarriers of described two adjacent OFDM symbol, is calculated frequency deviation Estimate.
15. devices according to claim 14 are it is characterised in that described adjustment unit includes：
First adjusting module, for being adjusted to the transmission power of T subcarrier of the first OFDM symbol more than described first The transmission power of all subcarriers of other of OFDM symbol, obtains the first transmission power；
Second adjusting module, for being adjusted to the transmission power of T subcarrier of the second OFDM symbol less than described second The transmission power of all subcarriers of other of OFDM symbol, obtains the second transmission power；
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
16. devices according to claim 15 are it is characterised in that described adjustment unit also includes：
First distribute module, for will be average with the power difference of described first transmission power for the specified transmission power of single OFDM Distribute to the other subcarriers in addition to described the T subcarrier in the subcarrier of the first OFDM symbol；
Second distribute module, for will be average with the power difference of described second transmission power for the specified transmission power of single OFDM Distribute to the other subcarriers in addition to described the T subcarrier in the subcarrier of the second OFDM symbol.
17. devices according to claim 16 are it is characterised in that described computing unit includes：
Acquisition module, for obtaining frequency deviation discreet value and cost function；
First computing module, for according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation Discreet value and cost function, are calculated offset estimation value.
18. devices according to claim 16 are it is characterised in that described computing unit also includes：
Second computing module, for calculating k-th subcarrier in k-th subcarrier and the second OFDM symbol in the first OFDM symbol Receiving power ratio；
First determining module, for according to all receiving power ratios, determining the P subcarrier；Wherein, in the first OFDM symbol In P subcarrier and the second OFDM symbol the receiving power ratio of P subcarrier be in all receiving power ratios Big value；
Second determining module, according to the absolute value of P and T difference, determines described offset estimation value.
A kind of 19. devices of offset estimation are it is characterised in that include：
Adjustment unit, the transmission power for OFDM symbol respective at least two subcarriers adjacent to two carries out power tune Whole, described at least two subcarriers include b1 to bJ subcarrier, and b1 to bJ is not less than the 1 and no more than integer of N, and J is Not less than the 1 and no more than integer of N, N is total number of sub-carriers；
Transmitter unit, for according to each subcarrier of power emission after adjustment；
Collecting unit, for gathering the receiving power of all subcarriers of described two adjacent OFDM symbol；
Computing unit, for the receiving power according to all subcarriers of described two adjacent OFDM symbol, is calculated frequency deviation Estimate.
20. devices according to claim 19 are it is characterised in that described adjustment unit includes：
First adjusting module, for being all adjusted to first by the transmission power of the b1 to bJ of the first OFDM symbol subcarrier Penetrate power, described first transmission power is more than the transmission power of all subcarriers of other of described first OFDM symbol；
Second adjusting module, for being all adjusted to second by the transmission power of the b1 to bJ of the second OFDM symbol subcarrier Penetrate power, described second transmission power is less than the transmission power of all subcarriers of other of described second OFDM symbol；
Wherein, two adjacent OFDM symbol include the first OFDM symbol and the second OFDM symbol.
21. devices according to claim 20 are it is characterised in that described adjustment unit also includes：
First distribute module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and the first OFDM symbol The power difference of transmission power sum be averagely allocated to and remove b1 to bJ subcarrier in the subcarrier of the first OFDM symbol Outer other subcarriers；
Second distribute module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and the second OFDM symbol The power difference of transmission power sum be averagely allocated to and remove described b1 to bJ in the subcarrier of the second OFDM symbol Other subcarriers outside carrier wave.
22. devices according to claim 20 are it is characterised in that described computing unit includes：
Acquisition module, for obtaining frequency deviation discreet value and described b1 to bJ subcarrier each corresponding cost function；
Computing module, for estimating according to the receiving power of all subcarriers of described two adjacent OFDM symbol, described frequency deviation Value and described b1 to bJ subcarrier each corresponding cost function, are calculated offset estimation value.
A kind of 23. devices of offset estimation are it is characterised in that include：
Adjustment unit, for carrying out power tune to the transmission power of respective at least two subcarriers of continuous even number OFDM symbol Whole, described continuous even number OFDM symbol includes m1 to mzOFDM symbol, and described at least two subcarriers include b1 extremely BJ subcarrier, b1 to bJ is not less than the 1 and no more than integer of N, and J is not less than the 1 and no more than integer of N, and N is subcarrier Sum, z is the integer of no more than OFDM symbol sum；
Transmitter unit, for according to each subcarrier of power emission after adjustment；
Collecting unit, for gathering the receiving power of all subcarriers of OFDM symbol of described continuous even number；
Computing unit, for the receiving power of all subcarriers of OFDM symbol according to described continuous even number, is calculated frequency Estimate partially.
24. devices according to claim 23 are it is characterised in that described adjustment unit includes：
First adjusting module, for being all adjusted to first by the transmission power of the b1 to bJ of m1OFDM symbol subcarrier Penetrate power, described first transmission power is more than the transmission power of all subcarriers of other of described m1OFDM symbol；
Second adjusting module, for being all adjusted to second by the transmission power of the b1 to bJ of m2OFDM symbol subcarrier Penetrate power, described second transmission power is less than the transmission power of all subcarriers of other of described m2 symbol；
3rd adjusting module, the like, for until transmitting work(by the b1 to bJ of mz-1OFDM symbol subcarrier Rate is all adjusted to z-1 transmission power, and described z-1 transmission power is more than all sub- loads of other of described mz-1OFDM symbol The transmission power of ripple；
4th adjusting module, sends out for the transmission power of the b1 to bJ of mzOFDM symbol subcarrier is all adjusted to z Penetrate power, described z transmission power is less than the transmission power of all subcarriers of other of described mz symbol.
25. devices according to claim 24 are it is characterised in that described adjustment unit also includes：
First distribute module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and m1OFDM symbol The power difference of transmission power sum be averagely allocated to and remove b1 to bJ subcarrier in the subcarrier of m1OFDM symbol Outer other subcarriers；
Second distribute module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and m2OFDM symbol The power difference of transmission power sum be averagely allocated to and remove described b1 to bJ in the subcarrier of m2OFDM symbol Other subcarriers outside carrier wave；
3rd distribute module, the like, for until by the specified transmission power of single OFDM and mzOFDM symbol the The power difference of the transmission power sum of b1 to bJ subcarrier is averagely allocated to and removes institute in the subcarrier of mzOFDM symbol State the other subcarriers outside b1 to bJ subcarrier.
26. devices according to claim 25 are it is characterised in that also include according to described computing unit：
Acquisition module, each corresponding to corresponding b1 to bJ subcarrier for obtaining frequency deviation discreet value and OFDM symbol Cost function, described OFDM symbol to adjacent for two in m1 to mzOFDM OFDM composition symbol to one of；
Computing module, for according to described OFDM symbol to the receiving power of corresponding all subcarriers, described frequency deviation discreet value And OFDM symbol, to corresponding b1 to bJ subcarrier each corresponding cost function, is calculated offset estimation value.
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