CN106453184B

CN106453184B - A kind of method and device of offset estimation

Info

Publication number: CN106453184B
Application number: CN201610714691.0A
Authority: CN
Inventors: 许炜阳; 李有均; 徐弘乾
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2016-08-24
Filing date: 2016-08-24
Publication date: 2019-07-16
Anticipated expiration: 2036-08-24
Also published as: CN106453184A

Abstract

The embodiment of the invention provides a kind of methods of offset estimation, are related to wireless communication field, can obtain offset estimation in the distribution situation that these subcarriers are investigated in receiving end by adjusting the transmission power of OFDM symbol sub-carriers to be sent.This method includes that the transmission power of the T subcarrier respective to two adjacent OFDM symbols carries out power adjustment, and T is the integer not less than 1 and no more than N, and N is total number of sub-carriers；According to each subcarrier of power emission adjusted；Acquire the reception power of described two all subcarriers of adjacent OFDM symbol；According to the reception power of described two all subcarriers of adjacent OFDM symbol, offset estimation value is calculated.Technical solution provided in an embodiment of the present invention can be suitable for including during carrying out blind estimate to integer frequency bias the systems such as single-input single-output (SISO)-OFDM and multiple-input and multiple-output MIMO-OFDM.

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 devices of offset estimation.

[background technique]

Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology conduct A kind of Radio Transmission Technology of high speed has many advantages, such as mitigating frequency-selective fading and narrowband interference, support high-rate information transmission, It is widely applied in the fields 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 Cyclic shift, so that the bit error rate of system is 50%, therefore receiver needs to be corrected integer frequency bias.The prior art is general It is that blind estimate compensation is carried out to integer frequency bias by transmitting unloaded wave.

In realizing process of the present invention, at least there are the following problems in the prior art for inventor's discovery:

It needs to transmit zero load during carrying out blind estimate compensation to integer frequency bias according to existing frequency deviation estimating method Wave, this occupies certain bandwidth, influences regular traffic transmission.

[summary of the invention]

In view of this, the embodiment of the invention provides a kind of method and devices of offset estimation, by adjusting to be sent The transmission power of OFDM symbol sub-carriers obtains offset estimation value in the distribution situation that subcarrier is investigated in receiving end.

In a first aspect, the embodiment of the invention provides a kind of methods of offset estimation, which comprises

The transmission power of the T subcarrier respective to two adjacent OFDM symbols carries out power adjustment, T be not less than 1 and be not more than N integer, N is total number of sub-carriers；

According to each subcarrier of power emission adjusted；

Acquire the reception power of described two all subcarriers of adjacent OFDM symbol；

According to the reception power of described two all subcarriers of adjacent OFDM symbol, offset estimation value is calculated.

Second aspect, the embodiment of the invention provides a kind of methods of offset estimation, which comprises

The transmission power of at least two subcarrier respective to two adjacent OFDM symbols carries out power adjustment, it is described extremely Few two subcarriers include b1 to bJ subcarrier, and b1 to bJ is not less than 1 and to be not more than the integer of N, J for not less than 1 and Integer N no more than N is total number of sub-carriers；

According to each subcarrier of power emission adjusted；

The third aspect, the embodiment of the invention provides a kind of methods of offset estimation, which comprises

Power adjustment, the company are carried out to the transmission power of respective at least two subcarrier of continuous even number OFDM symbol Continuous even number OFDM symbol includes m1 to mzOFDM symbol, and at least two subcarrier includes that b1 to bJ son carries Wave, b1 to bJ are the integer not less than 1 and no more than N, and J is the integer not less than 1 and no more than N, and N is total number of sub-carriers, and z is No more than OFDM symbol sum；

According to each subcarrier of power emission adjusted；

Acquire the reception power of all subcarriers of OFDM symbol of the continuous even number；

According to the reception power of all subcarriers of OFDM symbol of the continuous even number, offset estimation value is calculated.

Fourth aspect, the embodiment of the invention provides a kind of device of offset estimation, described device includes:

Adjustment unit carries out power for the transmission power to the respective the T subcarrier of two adjacent OFDM symbols Adjustment, T are the integer not less than 1 and no more than N, and N is total number of sub-carriers；

Transmitting unit, for according to each subcarrier of power emission adjusted；

Acquisition unit, for acquiring the reception power of described two all subcarriers of adjacent OFDM symbol；

Computing unit is calculated for the reception power according to described two all subcarriers of adjacent OFDM symbol Offset estimation value.

5th aspect, the embodiment of the invention provides a kind of device of offset estimation, described device includes:

Adjustment unit carries out function for the transmission power to respective at least two subcarrier of two adjacent OFDM symbols Rate adjustment, at least two subcarrier include b1 to bJ subcarrier, and b1 to bJ is the integer not less than 1 and no more than N, J is the integer not less than 1 and no more than N, and N is total number of sub-carriers；

6th aspect, the embodiment of the invention provides a kind of device of offset estimation, described device includes:

Adjustment unit carries out function for the transmission power to respective at least two subcarrier of continuous even number OFDM symbol Rate adjustment, the continuous even number OFDM symbol include m1 to mzOFDM symbol, and at least two subcarrier includes the B1 to bJ subcarrier, b1 to bJ are the integer not less than 1 and no more than N, and J is the integer not less than 1 and no more than N, and N is son Total number subcarriers, z are the integer no more than OFDM symbol sum；

Acquisition unit, the reception power of all subcarriers of OFDM symbol for acquiring the continuous even number；

Computing unit is calculated for the reception power according to all subcarriers of OFDM symbol of the continuous even number To offset estimation value.

The method and device of a kind of offset estimation provided in an embodiment of the present invention, by adjusting in OFDM symbol to be sent The transmission power of subcarrier investigates the distribution situation of these subcarriers it can be concluded that frequency after the Discrete Fourier Transform of receiving end Estimation partially.This frequency deviation estimating method does not need to transmit unloaded wave or pilot tone, saves system effect bandwidth.It is more by selecting A subcarrier improves method under multipath channel to obtain channel diversity and using multiple OFDM symbols participation offset estimation Performance so that the precision of offset estimation is higher.

[Detailed description of the invention]

In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached 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 offset estimation provided in an embodiment of the present invention；

Fig. 3 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Fig. 4 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Fig. 5 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Fig. 6 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Fig. 7 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Fig. 8 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Fig. 9 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Figure 10 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Figure 11 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Figure 12 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Figure 13 is the method flow diagram of another offset estimation provided in an embodiment of the present invention；

Figure 14 is a kind of composition block diagram of the device of offset estimation provided in an embodiment of the present invention；

Figure 15 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 16 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 17 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 18 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 19 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 20 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 21 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 22 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 23 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 24 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 25 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention；

Figure 26 is the composition block diagram of the device of another offset estimation provided in an embodiment of the present invention.

[specific embodiment]

For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention with reference to the accompanying drawing It states.

It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its Its embodiment, shall fall within the protection scope of the present invention.

The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments The present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the" It is also intended to including most forms, unless the context clearly indicates other meaning.

It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".

Depending on context, word as used in this " if " can be construed to " ... when " or " when ... When " or " in response to determination " or " in response to detection ".Similarly, depend on context, phrase " if it is determined that " or " if detection (condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when the detection (condition of statement Or event) when " or " in response to detection (condition or event of statement) ".

The embodiment of the invention provides a kind of method of offset estimation, can be suitable for including single-input single-output (SISO) during carrying out blind estimate to integer frequency bias in the systems such as-OFDM and multiple-input and multiple-output MIMO-OFDM, such as Fig. 1 It is shown, which comprises

101, the transmission power of the T subcarrier respective to two adjacent OFDM symbols carries out power adjustment.

Wherein, T is the integer not less than 1 and no more than N, and T can use arbitrary value in range, and N is total number of sub-carriers, hereinafter There is T and N and does this explanation.

Wherein, the OFDM symbol is that its discrete sample value is constituted after sub-carrier carries out Fast Fourier Transform (FFT), should Each of symbol sample value all contains all subcarrier informations.

102, according to each subcarrier of power emission adjusted.

Where it is assumed that channel is kept not within the duration of two adjacent OFDM symbols during transmitting subcarrier Become.

103, the reception power of described two all subcarriers of adjacent OFDM symbol is acquired.

104, according to the reception power of described two all subcarriers of adjacent OFDM symbol, offset estimation is calculated Value.

The method of a kind 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 of these subcarriers is investigated after the Discrete Fourier Transform of receiving end it can be concluded that frequency deviation is estimated Meter.This frequency deviation estimating method does not need to transmit unloaded wave or pilot tone, saves system effect bandwidth.

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How the transmission power of respective to two adjacent OFDM symbols the T subcarrier carries out the specific steps of power adjustment, Realization for step 101 provides process in detail below, as shown in Figure 2, comprising:

1011, the transmission power of the T subcarrier of the first OFDM symbol is adjusted to be greater than first OFDM symbol Other all subcarriers transmission power, obtain the first transmission power.

Wherein, the transmission power of the T subcarrier of first OFDM symbol is denoted as d_m,T, first transmission power As β d_m,T。

Wherein, m refers to that the serial number number of OFDM symbol, β refer to the power amplification factor, m hereinafter occurs and β does this It explains.

1012, the transmission power of the T subcarrier of the second OFDM symbol is adjusted to be less than second OFDM symbol Other all subcarriers transmission power, obtain the second transmission power.

Wherein, the transmission power of the T subcarrier of second OFDM symbol is d_m+1,T, second transmission power is d_m+1,T/β。

Wherein, two adjacent OFDM symbols include the first OFDM symbol and the second OFDM symbol.

It should be noted that the value of the power amplification factor-beta and 1/ β be it is opposite, with no restrictions to the value of β, So β can also be used as the factor of power diminution.

Furthermore, it is understood that on the basis of preceding method process, in order to guarantee that the general power of each OFDM symbol does not occur Variation, in the alternatively possible implementation of the embodiment of the present invention, additionally provide how in each OFDM symbol remove institute The power regulating method of other subcarriers outside the T subcarrier is stated, as shown in figure 3, including

1013, the power difference of the specified transmission power of single OFDM and first transmission power is averagely allocated to Other subcarriers in the subcarrier of first OFDM symbol in addition to the T subcarrier.

Wherein, the transmitting of other subcarriers in the subcarrier of first OFDM symbol in addition to the T subcarrier Power is d_m,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, k refers to the serial number number of subcarrier in OFDM symbol, for not less than 1 and be not more than N integer, hereinafter There is k and makees this explanation.

Wherein, the d that foregoing description arrives_m,TAnd d_m,kRefer to the transmitting of data on each subcarrier of the first OFDM symbol Power is traditionally arranged to be identical.

1014, the power difference of the specified transmission power of single OFDM and second transmission power is averagely allocated to Other subcarriers in the subcarrier of second OFDM symbol in addition to the T subcarrier.

Wherein, the transmitting of other subcarriers in the subcarrier of second OFDM symbol in addition to the T subcarrier Power is d_m+1,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, the d that foregoing description arrives_m+1,TAnd d_m+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 being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How according to the reception power of described two all subcarriers of adjacent OFDM symbol, the specific of offset estimation value is calculated Step, the realization for step 104 provide process in detail below, as shown in Figure 4, comprising:

1041, frequency deviation discreet value and cost function are obtained.

Wherein, the frequency deviation discreet value refers to conventional integer frequency bias estimated value.

Wherein, the cost function is related to the sub-carrier power ratio of adjacent OFDM symbol after adjustment.

1042, according to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation discreet value with And cost function, offset estimation value is calculated.

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How the specific steps of cost function are obtained, and realization for step 1041 provides process in detail below, comprising:

Step 1, the symbol d after power distribution_mAnd d_m+1By transmission, the integer frequency of conventional method routine is carried out Offset compensation, compensated reception signal are as follows:

Wherein, the ofdm system uses constant envelope modulation.

Wherein, υ represents integer frequency bias actual value,What is represented is integer frequency bias discreet value (i.e. conventional integer frequency bias estimation Value), L is the length of cyclic prefix, and W indicates that inverse discrete Fourier transform (IDFT) matrix, all symbols hereinafter occur Make this explanation.

Wherein, Φ and H respectively represents frequency deviation matrix and channel frequency response matrix:

Φ (υ)=diag { 1, e^j2πυ/N,…,e^{j2π(N-1)υ/N}}

H=diag { H_m,0,H_m,1,…,H_m,N-1}。

Wherein, w_mIndicate white Gaussian noise.

Step 2 calculates the power ratio that the compensation is followed by the collection of letters number, in the case where integer frequency bias is correctly compensated (i.e.), the data being modulated on k-th of subcarrier are still demodulated to k-th of subcarrier, compensated reception letter Number there is following relational expression:

Wherein, the compensation is calculated to be followed by ignoring w when the power ratio of the collection of letters number_mInfluence.

Wherein, it is described compensation be followed by collect mail number relational expression integer frequency bias cannot by correctly be compensated in the case where not at It is vertical.

Step 3, according to the above detailed process, derive the cost function of method:

Wherein, the integer frequency bias estimated value obtained according to the technical program that σ refers to.

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How according to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation discreet value and cost letter Number, is calculated the specific steps of offset estimation value, the realization for step 1042 provides process in detail below, comprising:

Step 1, maximization cost function obtain offset estimation value.

Wherein, when the frequency deviation discreet valueWhen equal to the frequency deviation actual value υ, cost function obtains maximum value, so most Bigization cost function is estimated that offset estimation value, may be expressed as: with formula

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How according to the reception power of described two all subcarriers of adjacent OFDM symbol, the specific of offset estimation value is calculated Step, and being further simplified to step 1041 and step 1042, the calculating process of offset estimation value σ is not related to frequency deviation and estimates ValueRealization for step 104 provides process in detail below, as shown in Figure 5, comprising:

1043, the reception function of k-th of subcarrier in k-th of subcarrier and the second OFDM symbol in the first OFDM symbol is calculated Rate ratio.

Wherein, the calculation method for receiving power ratio is similar with step 2 with step 1 in step 1041.

Wherein, in first OFDM symbol in k-th of subcarrier and the second OFDM symbol k-th of subcarrier reception function Rate is compensated without conventional integer frequency bias, i.e.,

1044, according to all reception power ratios, the P subcarrier is determined.

Wherein, in the first OFDM symbol in P subcarrier and the second OFDM symbol the P subcarrier reception power ratio Value is the maximum value in all reception power ratios.

Wherein, P refers to the serial number number of subcarrier in OFDM symbol, for the integer not less than 1 and no more than N.

Wherein, whenWhen obtaining maximum value, k=P.

1045, according to the absolute value of P and T difference, the offset estimation value is determined.

Wherein, the offset estimation value of N number of subcarrier is denoted as P-T, i.e. after the frequency of sub-carrier P and T is normalized Difference, may be expressed as: with formula

Wherein, [0, N-1] k ∈.

The embodiment of the invention provides a kind of method of offset estimation, can be suitable for including single-input single-output (SISO) during carrying out blind estimate to integer frequency bias in the systems such as-OFDM and multiple-input and multiple-output MIMO-OFDM, such as Fig. 6 It is shown, which comprises

201, the transmission power of at least two subcarrier respective to two adjacent OFDM symbols carries out power adjustment.

Wherein, at least two subcarrier includes b1 to bJ subcarrier, and b1 to bJ is not less than 1 and to be not more than N Integer, J is not less than 1 and to be not more than the integer of N, and appearing below related indicates to make this explanation.

202, according to each subcarrier of power emission adjusted.

203, the reception power of described two all subcarriers of adjacent OFDM symbol is acquired.

204, according to the reception power of described two all subcarriers of adjacent OFDM symbol, offset estimation is calculated Value.

The method of a kind of offset estimation provided in an embodiment of the present invention, by adjusting in OFDM symbol to be sent at least two The transmission power of a subcarrier, the distribution situation that these subcarriers are investigated after the Discrete Fourier Transform of receiving end obtain frequency deviation Estimation.The diversity of channel frequency response is utilized to fight wireless communication system in the transmission power for adjusting at least two subcarriers In multipath effect.When b1 to the bJ subcarrier being prevented to be in deep fading, white Gaussian noise estimates integer frequency bias Influence, improve the estimated accuracy of method.

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How the transmission power of respective to two adjacent OFDM symbols at least two subcarrier carries out the specific step of power adjustment Suddenly, process in detail below is provided for the realization of step 201, as shown in fig. 7, comprises:

2011, the transmission power of b1 to bJ subcarrier of the first OFDM symbol is adjusted to the first transmission power.

Wherein, first transmission power is greater than the transmission power of other all subcarriers of first OFDM symbol.

Wherein, the transmission power of b1 to bJ subcarrier of first OFDM symbol is d_m,b, the first transmitting function Rate is β d_m,b。

Wherein, the selection of b1 to the bJ subcarrier influences whether the performance of algorithm, needs to follow following three standards Then:

1) it chooses over the entire frequency band as far as possible to obtain maximum channel diversity characteristic.

2) subcarrier frequency deviation forms cyclic shift and causes error in order to prevent, the distance between the adjacent subcarrier being selected Must be different, that is, meet:

c₁=b₂-b₁

c₂=b₃-b₂…

c_J=b₁-b_J

c_j-1≠c_j, 1≤j≤J.

Wherein, c refers to the difference between two sub- centre carrier frequencies.

3) the continuous sum of the distance of any two also must be different, it may be assumed that

c₁+c₂≠c₃+c₄

c₃+c₄≠c₅+c₆…

c_J-1+c_J≠c₁+c₂

That is c_j-1+c_j≠c_j+1+c_j+2。

2012, the transmission power of b1 to bJ subcarrier of the second OFDM symbol is adjusted to the second transmission power.

Wherein, second transmission power is less than the transmission power of other all subcarriers of second OFDM symbol.

Wherein, the transmission power of b1 to bJ subcarrier of second OFDM symbol is d_m+1,b, then described second send out Penetrating power is d_m+1,b/β。

Furthermore, it is understood that on the basis of preceding method process, in order to guarantee that the general power of each OFDM symbol does not occur Variation, in the alternatively possible implementation of the embodiment of the present invention, additionally provide how in each OFDM symbol remove institute The power regulating method of other subcarriers outside b1 to bJ subcarrier is stated, as shown in Figure 8, comprising:

2013, by the transmitting function of the specified transmission power of single OFDM and b1 to bJ subcarrier of the first OFDM symbol The power difference of the sum of rate is averagely allocated to other in addition to b1 to bJ subcarrier in the subcarrier of the first OFDM symbol Subcarrier.

Wherein, other subcarriers in the subcarrier of first OFDM symbol in addition to b1 to the bJ subcarrier Transmission power is d_m,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, the d that foregoing description arrives_m,bAnd d_m,kRefer to the transmitting of data on each subcarrier of the first OFDM symbol Power is traditionally arranged to be identical.

2014, by the transmitting function of the specified transmission power of single OFDM and b1 to bJ subcarrier of the second OFDM symbol The power difference of the sum of rate is averagely allocated in the subcarrier of the second OFDM symbol in addition to b1 to the bJ subcarrier Other subcarriers.

Wherein, other subcarriers in the subcarrier of second OFDM symbol in addition to b1 to the bJ subcarrier Transmission power is d_m+1,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, the d that foregoing description arrives_m+1,bAnd d_m+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 being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How according to the reception power of described two all subcarriers of adjacent OFDM symbol, the specific of offset estimation value is calculated Step, the realization for step 204 provide process in detail below, as shown in Figure 9, comprising:

2041, frequency deviation discreet value and the corresponding cost function of b1 to the bJ subcarrier are obtained.

Wherein, please join for how to obtain the specific steps of the corresponding cost function of b1 to the bJ subcarrier According to the step 1 in step 1041 to step 3.

Wherein, the frequency deviation discreet value refers to the integer frequency bias estimated value in conventional OFDM system.

2042, according to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation discreet value with And the corresponding cost function of b1 to the bJ subcarrier, offset estimation value is calculated.

Wherein, according to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation discreet value with And the corresponding cost function of b1 to the bJ subcarrier, obtaining offset estimation value can be formulated as:

Wherein, [0, N-1] σ ∈, Γ_J={ b₁,b₂,…,b_J,b₁< b₂... < b_J< N }.

The method of a kind of offset estimation provided in an embodiment of the present invention, by adjusting in OFDM symbol to be sent at least two The transmission power of a subcarrier, the distribution situation that these subcarriers are investigated after the Discrete Fourier Transform of receiving end obtain frequency deviation Estimation.The diversity of channel frequency response is utilized to fight multipath effect in the transmission power for adjusting at least two subcarriers.It prevents When b1 to the bJ subcarrier is in deep fading, the influence that white Gaussian noise estimates integer frequency bias improves method Estimated accuracy.

The embodiment of the invention provides a kind of method of offset estimation, can be suitable for including single-input single-output (SISO) during carrying out blind estimate to integer frequency bias in the systems such as-OFDM and multiple-input and multiple-output MIMO-OFDM, such as Figure 10 It is shown, which comprises

301, power adjustment is carried out to the transmission power of respective at least two subcarrier of continuous even number OFDM symbol.

Wherein, the continuous even number OFDM symbol includes m1 to mzOFDM symbol, at least two subcarrier Including b1 to bJ subcarrier.

Wherein, z is the integer no more than OFDM symbol sum, hereinafter makees this explanation.

302, according to each subcarrier of power emission adjusted.

Where it is assumed that channel remains unchanged within the duration of continuous OFDM symbol during transmitting subcarrier.

303, the reception power of all subcarriers of OFDM symbol of the continuous even number is acquired.

304, according to the reception power of all subcarriers of OFDM symbol of the continuous even number, offset estimation is calculated Value.

A kind of method of offset estimation provided in an embodiment of the present invention accords with by adjusting continuous even number OFDM to be sent The transmission power of number respective at least two subcarrier investigates point of these subcarriers after the Discrete Fourier Transform of receiving end Cloth situation obtains offset estimation.Adjust the transmission power of continuous even number OFDM symbol subcarrier, it is therefore prevented that extremely except the b1 When the outer other subcarriers of bJ subcarrier are in deep fading, the influence that noise estimates integer frequency bias improves method Estimated accuracy.

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How power adjustment is carried out to the transmission power to continuous even number OFDM symbol respective at least two subcarrier Specific steps, the realization for step 301 provide process in detail below, as shown in figure 11, comprising:

3011, the transmission power of b1 to bJ subcarrier of m1OFDM symbol is adjusted to the first transmission power.

Wherein, first transmission power is greater than the transmission power of other all subcarriers of the m1OFDM symbol.

Wherein, the transmission power of b1 to bJ subcarrier of the m1OFDM symbol is d_m1,b, first transmitting Power is β d_m1,b。

Wherein, b ∈ [b1, b2 ... bJ].

3012, the transmission power of b1 to bJ subcarrier of m2OFDM symbol is adjusted to the second transmission power.

Wherein, second transmission power is less than the transmission power of other all subcarriers of the m2OFDM symbol.

Wherein, the transmission power of b1 to bJ subcarrier of the m2OFDM symbol is d_m2,b, second transmitting Power is d_m2,b/β。

3013, and so on, until the transmission power of b1 to bJ subcarrier of mz-1OFDM symbol is adjusted To z-1 transmission power.

Wherein, the z-1 transmission power is greater than the transmitting function of other all subcarriers of the mz-1OFDM symbol Rate.

Wherein, the transmission power of b1 to bJ subcarrier of the mz-1OFDM symbol is d_mz-1,b, the z-1 Transmission power is β d_mz-1,b。

3014, the transmission power of b1 to bJ subcarrier of mzOFDM symbol is adjusted to M transmission power.

Wherein, the z transmission power is less than the transmission power of other all subcarriers of the mzOFDM symbol.

Wherein, the transmission power of b1 to bJ subcarrier of the mzOFDM symbol is d_mz,b, the z transmitting function Rate is d_mz,b/β。

Furthermore, it is understood that on the basis of preceding method process, in order to guarantee that the general power of each OFDM symbol does not occur Variation carries in the alternatively possible implementation of the embodiment of the present invention by b1 to bJ son of mzOFDM symbol The transmission power of wave is adjusted to after z transmission power, as shown in figure 12, further includes:

3015, by the transmitting function of the specified transmission power of single OFDM and b1 to bJ subcarrier of m1OFDM symbol The power difference of the sum of rate is averagely allocated to other in addition to b1 to bJ subcarrier in the subcarrier of m1OFDM symbol Subcarrier.

Wherein, other subcarriers in the subcarrier of the m1OFDM symbol in addition to b1 to the bJ subcarrier Transmission power is d_m1,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, k refers to the serial number number of subcarrier in OFDM symbol, k ≠ b.

Wherein, the d that foregoing description arrives_m1,bAnd d_m1,kRefer to the hair of data on each subcarrier of m1OFDM symbol Power is penetrated, is traditionally arranged to be identical.

3016, by the transmitting function of the specified transmission power of single OFDM and b1 to bJ subcarrier of m2OFDM symbol The power difference of the sum of rate is averagely allocated in the subcarrier of m2OFDM symbol in addition to b1 to the bJ subcarrier Other subcarriers.

Wherein, other subcarriers in the subcarrier of the m2OFDM symbol in addition to b1 to the bJ subcarrier Transmission power is d_m2,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, the d that foregoing description arrives_m2,bAnd d_m2,kRefer to the hair of data on each subcarrier of m2OFDM symbol Power is penetrated, is traditionally arranged to be identical.

3017, and so on, until by the b1 to bJ of the specified transmission power of single OFDM and mzOFDM symbol The power difference of the sum of the transmission power of subcarrier is averagely allocated in the subcarrier of mzOFDM symbol except the b1 extremely Other subcarriers outside bJ subcarrier.

Wherein, other subcarriers in the subcarrier of the mzOFDM symbol in addition to b1 to the bJ subcarrier Transmission power is d_mz,k, after power adjustment, the transmission power of other subcarriers is transformed to

Wherein, the d that foregoing description arrives_mz,bAnd d_mz,kRefer to the hair of data on each subcarrier of mzOFDM symbol Power is penetrated, is traditionally arranged to be identical.

Furthermore, it is understood that being provided in conjunction with preceding method process in the alternatively possible implementation of the embodiment of the present invention How according to the reception power of OFDM symbol all subcarriers of the continuous even number, the tool of offset estimation value is calculated Body step, the realization for step 304 provide process in detail below, as shown in figure 13, comprising:

3041, frequency deviation discreet value and OFDM symbol are obtained to the corresponding cost of corresponding b1 to bJ subcarrier Function.

Wherein, the OFDM symbol is to for m1, into mzOFDM, two adjacent OFDM form the one of symbol centering It is a.

Wherein, the acquisition OFDM symbol is to the specific of the corresponding cost function of corresponding b1 to bJ subcarrier Step please refers to the step 1 in step 1041 to step 3.

Wherein, the OFDM symbol logarithm is z/2, is worth available generation for each possible offset estimation accordingly Valence function is also z/2.

3042, according to the OFDM symbol to the reception power of corresponding all subcarriers, the frequency deviation discreet value and Offset estimation value is calculated to the corresponding cost function of corresponding b1 to bJ subcarrier in OFDM symbol.

Wherein, the OFDM symbol is z/2 generation to the corresponding cost function of corresponding b1 to bJ subcarrier Optimal value in valence function.

Wherein, the optimal value of the cost function is minimum value.

Wherein, the optimal value of the cost function is that the deterministic process of minimum 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 A corresponding cost function of subcarrier existsWhen value are as follows:

If not the T subcarrier, but other subcarriers are in deep fading, even if in this case small Noise can also allow denominator to go to zero and cause to judge by accident, so corresponding functional value should be most when cost function is optimal value Small, i.e., the optimal value of the described cost function is minimum value.

Wherein, according to the OFDM symbol to the reception power of corresponding all subcarriers, the frequency deviation discreet value and OFDM symbol obtains offset estimation value to the corresponding cost function of corresponding b1 to bJ subcarrier, can use formula table It is shown as:

Wherein, [0, N-1] σ ∈, Γ_J={ b₁,b₂,…,b_J,b₁< b₂... < b_J< N }.

Wherein, m ∈ [0,2 ... z-4, z-2].

Wherein, it should be noted that m, m+1, m1, m2 ... mz-1, mz were represented is the serial number number of OFDM symbol, in order to The convenience of statement, we used different expression ways.

It the embodiment of the invention provides a kind of device of offset estimation, can be used for realizing aforementioned approaches method process, form As shown in figure 14, comprising:

Adjustment unit 41 carries out function for the transmission power to the respective the T subcarrier of two adjacent OFDM symbols Rate adjustment, T are the integer not less than 1 and no more than N, and N is total number of sub-carriers.

Transmitting unit 42, for according to each subcarrier of power emission adjusted.

Acquisition unit 43, for acquiring the reception power of described two all subcarriers of adjacent OFDM symbol.

Computing unit 44 is calculated for the reception power according to described two all subcarriers of adjacent OFDM symbol To offset estimation value.

Optionally, as shown in figure 15, the adjustment unit 41 includes:

The first adjustment module 411 is greater than institute for the transmission power of the T subcarrier of the first OFDM symbol to be adjusted to The transmission power for stating other all subcarriers of the first OFDM symbol, obtains the first transmission power.

Second adjustment module 412 is less than institute for the transmission power of the T subcarrier of the second OFDM symbol to be adjusted to The transmission power for stating other all subcarriers of the second OFDM symbol, obtains the second transmission power.

Optionally, as shown in figure 16, the adjustment unit 41 further include:

First distribution module 413, for by the power of the specified transmission power of single OFDM and first transmission power Difference is averagely allocated to other subcarriers in the subcarrier of the first OFDM symbol in addition to the T subcarrier.

Second distribution module 414, for by the power of the specified transmission power of single OFDM and second transmission power Difference is averagely allocated to other subcarriers in the subcarrier of the second OFDM symbol in addition to the T subcarrier.

Optionally, as shown in figure 17, the computing unit 44 includes:

Module 441 is obtained, for obtaining frequency deviation discreet value and cost function.

First computing module 442, for the reception power according to described two all subcarriers of adjacent OFDM symbol, institute Frequency deviation discreet value and cost function are stated, offset estimation value is calculated.

Optionally, as shown in figure 18, the computing unit 44 further include:

Second computing module 443, for kth in k-th of subcarrier in the first OFDM symbol of calculating and the second OFDM symbol The reception power ratio of a subcarrier.

First determining module 444, for determining the P subcarrier according to all reception power ratios；Wherein, first The reception power ratio of the P subcarrier is all reception power in P subcarrier and the second OFDM symbol in OFDM symbol Maximum value in ratio.

Second determining module 445 determines the offset estimation value according to the absolute value of P and T difference.

The device of a kind 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 of these subcarriers is investigated after the Discrete Fourier Transform of receiving end it can be concluded that frequency deviation is estimated Meter.The device of this offset estimation does not need to transmit unloaded wave or pilot tone, saves system effect bandwidth.

It the embodiment of the invention provides a kind of device of offset estimation, can be used for realizing aforementioned approaches method process, form As shown in figure 19, comprising:

Adjustment unit 51 is carried out for the transmission power to respective at least two subcarrier of two adjacent OFDM symbols Power adjustment, at least two subcarrier include b1 to bJ subcarrier, and b1 to bJ is not less than 1 and whole no more than N Number, J are the integer not less than 1 and no more than N, and N is total number of sub-carriers.

Transmitting unit 52, for according to each subcarrier of power emission adjusted.

Acquisition unit 53, for acquiring the reception power of described two all subcarriers of adjacent OFDM symbol.

Computing unit 54 is calculated for the reception power according to described two all subcarriers of adjacent OFDM symbol To offset estimation value.

Optionally, as shown in figure 20, the adjustment unit 51 includes:

The first adjustment module 511, for adjusting the transmission power of b1 to bJ subcarrier of the first OFDM symbol To the first transmission power, first transmission power is greater than the transmitting function of other all subcarriers of first OFDM symbol Rate.

Second adjustment module 512, for adjusting the transmission power of b1 to bJ subcarrier of the second OFDM symbol To the second transmission power, second transmission power is less than the transmitting function of other all subcarriers of second OFDM symbol Rate.

Optionally, as shown in figure 21, the adjustment unit 51 further include:

First distribution 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 sum of the transmission power of a subcarrier is averagely allocated in the subcarrier of the first OFDM symbol except b1 to bJ Other subcarriers outside a subcarrier.

Second distribution 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 sum of the transmission power of a subcarrier is averagely allocated in the subcarrier of the second OFDM symbol except the b1 Other subcarriers outside to bJ subcarrier.

Optionally, as shown in figure 22, the computing unit 54 includes:

Module 541 is obtained, for obtaining frequency deviation discreet value and the corresponding cost of b1 to the bJ subcarrier Function.

Computing module 542, for reception power, the frequency according to described two all subcarriers of adjacent OFDM symbol Inclined discreet value and the corresponding cost function of b1 to the bJ subcarrier, are calculated offset estimation value.

The device of a kind of offset estimation provided in an embodiment of the present invention, by adjusting in OFDM symbol to be sent at least two The transmission power of a subcarrier, the distribution situation that these subcarriers are investigated after the Discrete Fourier Transform of receiving end obtain frequency deviation Estimation.The diversity of channel frequency response is utilized to fight multipath effect in the transmission power for adjusting at least two subcarriers.It prevents When b1 to the bJ subcarrier is in deep fading, the influence that white Gaussian noise estimates integer frequency bias improves estimation Precision.

It the embodiment of the invention provides a kind of device of offset estimation, can be used for realizing aforementioned approaches method process, form As shown in figure 23, comprising:

Adjustment unit 61 is carried out for the transmission power to respective at least two subcarrier of continuous even number OFDM symbol Power adjustment, the continuous even number OFDM symbol include m1 to mzOFDM symbol, and at least two subcarrier includes B1 to bJ subcarrier, b1 to bJ are the integer not less than 1 and no more than N, and J is the integer not less than 1 and no more than N, and N is Total number of sub-carriers, z are the integer no more than OFDM symbol sum.

Transmitting unit 62, for according to each subcarrier of power emission adjusted.

Acquisition unit 63, the reception power of all subcarriers of OFDM symbol for acquiring the continuous even number.

Computing unit 64 is calculated for the reception power according to all subcarriers of OFDM symbol of the continuous even number Obtain offset estimation value.

Optionally, as shown in figure 24, the adjustment unit 61 includes:

The first adjustment module 611, for adjusting the transmission power of b1 to bJ subcarrier of m1OFDM symbol To the first transmission power, first transmission power is greater than the transmitting function of other all subcarriers of the m1OFDM symbol Rate.

Second adjustment module 612, for adjusting the transmission power of b1 to bJ subcarrier of m2OFDM symbol To the second transmission power, second transmission power is less than the transmission power of other all subcarriers of the m2 symbol.

Third adjusts module 613, and so on, for until by b1 to bJ subcarrier of mz-1OFDM symbol Transmission power is adjusted to z-1 transmission power, and the z-1 transmission power is greater than other institutes of the mz-1OFDM symbol There is the transmission power of subcarrier.

4th adjustment module 614, for adjusting the transmission power of b1 to bJ subcarrier of mzOFDM symbol To z transmission power, the z transmission power is less than the transmission power of other all subcarriers of the mz symbol.

Optionally, as shown in figure 25, the adjustment unit 61 further include:

First distribution module 615, for by the b1 to bJ of the specified transmission power and m1OFDM symbol of single OFDM The power difference of the sum of the transmission power of a subcarrier is averagely allocated in the subcarrier of m1OFDM symbol except b1 to bJ Other subcarriers outside a subcarrier.

Second distribution module 616, for by the b1 to bJ of the specified transmission power and m2OFDM symbol of single OFDM The power difference of the sum of the transmission power of a subcarrier is averagely allocated in the subcarrier of m2OFDM symbol except the b1 Other subcarriers outside to bJ subcarrier.

Third distribution module 617, and so on, for until the specified transmission power of single OFDM and mzOFDM are accorded with Number the power difference of the sum of the transmission power of b1 to bJ subcarrier be averagely allocated to the subcarrier in mzOFDM symbol In other subcarriers in addition to b1 to the bJ subcarrier.

Optionally, as shown in figure 26, the computing unit 64 includes:

Module 641 is obtained, it is each to corresponding b1 to bJ subcarrier for obtaining frequency deviation discreet value and OFDM symbol Self-corresponding cost function, the OFDM symbol is to for m1, into mzOFDM, two adjacent OFDM form symbol centering One.

Computing module 642, for the reception power according to the OFDM symbol to corresponding all subcarriers, the frequency deviation Offset estimation is calculated to the corresponding cost function of corresponding b1 to bJ subcarrier in discreet value and OFDM symbol Value.

A kind of device of offset estimation provided in an embodiment of the present invention accords with by adjusting continuous even number OFDM to be sent The transmission power of number respective at least two subcarrier investigates point of these subcarriers after the Discrete Fourier Transform of receiving end Cloth situation obtains offset estimation.Adjust the transmission power of continuous even number OFDM symbol subcarrier, it is therefore prevented that extremely except the b1 When the outer other subcarriers of bJ subcarrier are in deep fading, the influence that noise estimates integer frequency bias improves estimation essence Degree.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In several embodiments provided by the present invention, it should be understood that disclosed system, device and method can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or group Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown Or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, device or unit it is indirect Coupling or communication connection can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.

The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer It is each that device (can be personal computer, server or network equipment etc.) or processor (Processor) execute the present invention The part steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read- Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. it is various It can store the medium of program code.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.

Claims

1. a kind of method of offset estimation characterized by comprising

The transmission power of the T subcarrier respective to two adjacent OFDM symbols carries out power adjustment, T be not less than 1 and Integer no more than N, N are total number of sub-carriers；

According to each subcarrier of power emission adjusted；

According to the reception power of described two all subcarriers of adjacent OFDM symbol, offset estimation value is calculated；

According to the reception power of described two all subcarriers of adjacent OFDM symbol, offset estimation value, which is calculated, includes:

Obtain frequency deviation discreet value and cost function；

According to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation discreet value and cost letter Number, is calculated offset estimation value；

Calculate the reception power ratio of k-th of subcarrier in k-th of subcarrier and the second OFDM symbol in the first OFDM symbol；

According to all reception power ratios, the P subcarrier is determined；Wherein, P subcarrier and second in the first OFDM symbol The reception power ratio of the P subcarrier is the maximum value in all reception power ratios in OFDM symbol；

According to the absolute value of P and T difference, the offset estimation value is determined.

2. the method according to claim 1, wherein the T respective to two adjacent OFDM symbols The transmission power of subcarrier carries out power adjustment

The transmission power of the T subcarrier of the first OFDM symbol is adjusted to other all greater than first OFDM symbol The transmission power of subcarrier obtains the first transmission power；

The transmission power of the T subcarrier of the second OFDM symbol is adjusted to other all less than second OFDM symbol The transmission power of subcarrier obtains the second transmission power；

3. according to the method described in claim 2, it is characterized in that, by the transmitting of the T subcarrier of the second OFDM symbol Power adjustment to be less than second OFDM symbol other all subcarriers transmission power, obtain the second transmission power it Afterwards, further includes:

The power difference of the specified transmission power of single OFDM and first transmission power is averagely allocated in the first OFDM Other subcarriers in the subcarrier of symbol in addition to the T subcarrier；

The power difference of the specified transmission power of single OFDM and second transmission power is averagely allocated in the 2nd OFDM Other subcarriers in the subcarrier of symbol in addition to the T subcarrier.

4. a kind of method of offset estimation characterized by comprising

The transmission power progress power adjustment of at least two subcarrier respective to two adjacent OFDM symbols, described at least two A subcarrier includes b1 to bJ subcarrier, and b1 to bJ is the integer not less than 1 and no more than N, and J is not less than 1 and little In the integer of N, N is total number of sub-carriers；

According to each subcarrier of power emission adjusted；

The reception power according to described two all subcarriers of adjacent OFDM symbol, is calculated offset estimation value packet It includes:

Obtain frequency deviation discreet value and the corresponding cost function of b1 to the bJ subcarrier；

According to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation discreet value and the b1 To the corresponding cost function of bJ subcarrier, offset estimation value is calculated.

5. according to the method described in claim 4, it is characterized in that, described respective to two adjacent OFDM symbols at least two The transmission power of a subcarrier carries out power adjustment

The transmission power of b1 to bJ subcarrier of the first OFDM symbol is adjusted to the first transmission power, first hair Penetrate transmission power of the power greater than other all subcarriers of first OFDM symbol；

The transmission power of b1 to bJ subcarrier of the second OFDM symbol is adjusted to the second transmission power, second hair Penetrate transmission power of the power less than other all subcarriers of second OFDM symbol；

6. according to the method described in claim 5, it is characterized in that, by b1 to bJ subcarrier of the second OFDM symbol Transmission power is adjusted to after the second transmission power, further includes:

By the sum of the transmission power of b1 to bJ subcarrier of the specified transmission power of single OFDM and the first OFDM symbol Power difference is averagely allocated to other subcarriers in the subcarrier of the first OFDM symbol in addition to b1 to bJ subcarrier；

By the sum of the transmission power of b1 to bJ subcarrier of the specified transmission power of single OFDM and the second OFDM symbol Power difference is averagely allocated to other sub- loads in the subcarrier of the second OFDM symbol in addition to b1 to the bJ subcarrier Wave.

7. a kind of method of offset estimation characterized by comprising

Power adjustment, the continuous idol are carried out to the transmission power of respective at least two subcarrier of continuous even number OFDM symbol Several OFDM symbols include m1 to mzOFDM symbol, and at least two subcarrier includes b1 to bJ subcarrier, b1 To the integer that bJ is not less than 1 and no more than N, J is the integer not less than 1 and no more than N, and N is total number of sub-carriers, and z is little In the integer of OFDM symbol sum；

According to each subcarrier of power emission adjusted；

According to the reception power of all subcarriers of OFDM symbol of the continuous even number, offset estimation value is calculated；

According to the reception power of all subcarriers of OFDM symbol of the continuous even number, offset estimation value, which is calculated, includes:

Acquisition frequency deviation discreet value and OFDM symbol are described to the corresponding cost function of corresponding b1 to bJ subcarrier OFDM symbol is to for m1, into mzOFDM, two adjacent OFDM form one of symbol centering；

According to the OFDM symbol to the reception power of corresponding all subcarriers, the frequency deviation discreet value and OFDM symbol pair The corresponding cost function of corresponding b1 to bJ subcarrier, is calculated offset estimation value.

8. the method according to the description of claim 7 is characterized in that described respective to continuous even number OFDM symbol at least two The transmission power of a subcarrier carries out power adjustment

The transmission power of b1 to bJ subcarrier of m1OFDM symbol is adjusted to the first transmission power, first hair Penetrate transmission power of the power greater than other all subcarriers of the m1OFDM symbol；

The transmission power of b1 to bJ subcarrier of m2OFDM symbol is adjusted to the second transmission power, second hair Penetrate transmission power of the power less than other all subcarriers of the m2 symbol；

And so on, until the transmission power of b1 to bJ subcarrier of mz-1OFDM symbol is adjusted to z-1 hair Power is penetrated, the z-1 transmission power is greater than the transmission power of other all subcarriers of the mz-1OFDM symbol；

The transmission power of b1 to bJ subcarrier of mzOFDM symbol is adjusted to z transmission power, the z transmitting Power is less than the transmission power of other all subcarriers of the mz symbol.

9. according to the method described in claim 8, it is characterized in that, by b1 to bJ subcarrier of mzOFDM symbol Transmission power is adjusted to after z transmission power, further includes:

By the sum of the specified transmission power of single OFDM and the transmission power of b1 to bJ subcarrier of m1OFDM symbol Power difference is averagely allocated to other subcarriers in the subcarrier of m1OFDM symbol in addition to b1 to bJ subcarrier；

By the sum of the specified transmission power of single OFDM and the transmission power of b1 to bJ subcarrier of m2OFDM symbol Power difference is averagely allocated to other sub- loads in the subcarrier of m2OFDM symbol in addition to b1 to the bJ subcarrier Wave；

And so on, until by the hair of the specified transmission power of single OFDM and b1 to bJ subcarrier of mzOFDM symbol The power difference for penetrating the sum of power is averagely allocated in the subcarrier of mzOFDM symbol except b1 to the bJ subcarrier Outer other subcarriers.

10. a kind of device of offset estimation characterized by comprising

Adjustment unit carries out power adjustment for the transmission power to the respective the T subcarrier of two adjacent OFDM symbols, T is the integer not less than 1 and no more than N, and N is total number of sub-carriers；

Frequency deviation is calculated for the reception power according to described two all subcarriers of adjacent OFDM symbol in computing unit Estimated value；

The computing unit includes: acquisition module, for obtaining frequency deviation discreet value and cost function；

First computing module, for the reception power according to described two all subcarriers of adjacent OFDM symbol, the frequency deviation Offset estimation value is calculated in discreet value and cost function；

The computing unit further include:

Second computing module, for k-th of subcarrier in k-th of subcarrier in the first OFDM symbol of calculating and the second OFDM symbol Reception power ratio；

First determining module, for determining the P subcarrier according to all reception power ratios；Wherein, in the first OFDM symbol In P subcarrier and the second OFDM symbol the reception power ratio of the P subcarrier be all reception power ratios in most Big value；

Second determining module determines the offset estimation value according to the absolute value of P and T difference.

11. device according to claim 10, which is characterized in that the adjustment unit includes:

The first adjustment module is greater than described first for the transmission power of the T subcarrier of the first OFDM symbol to be adjusted to The transmission power of other all subcarriers of OFDM symbol, obtains the first transmission power；

Second adjustment module is less than described second for the transmission power of the T subcarrier of the second OFDM symbol to be adjusted to The transmission power of other all subcarriers of OFDM symbol, obtains the second transmission power；

12. device according to claim 11, which is characterized in that the adjustment unit further include:

First distribution module, for the specified transmission power of single OFDM and the power difference of first transmission power to be averaged Distribute to other subcarriers in the subcarrier of the first OFDM symbol in addition to the T subcarrier；

Second distribution module, for the specified transmission power of single OFDM and the power difference of second transmission power to be averaged Distribute to other subcarriers in the subcarrier of the second OFDM symbol in addition to the T subcarrier.

13. a kind of device of offset estimation characterized by comprising

Adjustment unit carries out power tune for the transmission power to respective at least two subcarrier of two adjacent OFDM symbols Whole, at least two subcarrier includes b1 to bJ subcarrier, and b1 to bJ is the integer not less than 1 and no more than N, and J is Integer not less than 1 and no more than N, N is total number of sub-carriers；

The computing unit includes:

Module is obtained, for obtaining frequency deviation discreet value and the corresponding cost function of b1 to the bJ subcarrier；

Computing module, for being estimated according to the reception power of described two all subcarriers of adjacent OFDM symbol, the frequency deviation Value and the corresponding cost function of b1 to the bJ subcarrier, are calculated offset estimation value.

14. device according to claim 13, which is characterized in that the adjustment unit includes:

The first adjustment module, for the transmission power of b1 to bJ subcarrier of the first OFDM symbol to be adjusted to the first hair Power is penetrated, first transmission power is greater than the transmission power of other all subcarriers of first OFDM symbol；

Second adjustment module, for the transmission power of b1 to bJ subcarrier of the second OFDM symbol to be adjusted to the second hair Power is penetrated, second transmission power is less than the transmission power of other all subcarriers of second OFDM symbol；

15. device according to claim 14, which is characterized in that the adjustment unit further include:

First distribution module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and the first OFDM symbol The power difference of the sum of transmission power be averagely allocated in the subcarrier of the first OFDM symbol except b1 to bJ subcarrier Outer other subcarriers；

Second distribution module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and the second OFDM symbol The power difference of the sum of transmission power be averagely allocated in the subcarrier of the second OFDM symbol except described b1 to bJ sub Other subcarriers outside carrier wave.

16. a kind of device of offset estimation characterized by comprising

Adjustment unit carries out power tune for the transmission power to respective at least two subcarrier of continuous even number OFDM symbol Whole, the continuous even number OFDM symbol includes m1 to mzOFDM symbol, at least two subcarrier include b1 extremely BJ subcarrier, b1 to bJ are the integer not less than 1 and no more than N, and J is the integer not less than 1 and no more than N, and N is subcarrier Sum, z are the integer no more than OFDM symbol sum；

Frequency is calculated for the reception power according to all subcarriers of OFDM symbol of the continuous even number in computing unit Inclined estimated value；

The computing unit further include:

Module is obtained, it is corresponding to corresponding b1 to bJ subcarrier for obtaining frequency deviation discreet value and OFDM symbol Cost function, the OFDM symbol is to for m1, into mzOFDM, two adjacent OFDM form one of symbol centering；

Computing module, for the reception power according to the OFDM symbol to corresponding all subcarriers, the frequency deviation discreet value And offset estimation value is calculated to the corresponding cost function of corresponding b1 to bJ subcarrier in OFDM symbol.

17. device according to claim 16, which is characterized in that the adjustment unit includes:

The first adjustment module, for the transmission power of b1 to bJ subcarrier of m1OFDM symbol to be adjusted to the first hair Power is penetrated, first transmission power is greater than the transmission power of other all subcarriers of the m1OFDM symbol；

Second adjustment module, for the transmission power of b1 to bJ subcarrier of m2OFDM symbol to be adjusted to the second hair Power is penetrated, second transmission power is less than the transmission power of other all subcarriers of the m2 symbol；

Third adjusts module, and so on, for until by the transmitting function of b1 to bJ subcarrier of mz-1OFDM symbol Rate is adjusted to z-1 transmission power, and the z-1 transmission power is greater than other all sub- loads of the mz-1OFDM symbol The transmission power of wave；

4th adjustment module, for the transmission power of b1 to bJ subcarrier of mzOFDM symbol to be adjusted to z hair Power is penetrated, the z transmission power is less than the transmission power of other all subcarriers of the mz symbol.

18. device according to claim 17, which is characterized in that the adjustment unit further include:

First distribution module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and m1OFDM symbol The power difference of the sum of transmission power be averagely allocated in the subcarrier of m1OFDM symbol except b1 to bJ subcarrier Outer other subcarriers；

Second distribution module, for by b1 to bJ subcarrier of the specified transmission power of single OFDM and m2OFDM symbol The power difference of the sum of transmission power be averagely allocated in the subcarrier of m2OFDM symbol except described b1 to bJ sub Other subcarriers outside carrier wave；

Third distribution module, and so on, for until by the of the specified transmission power of single OFDM and mzOFDM symbol The power difference of the sum of the transmission power of b1 to bJ subcarrier is averagely allocated in the subcarrier of mzOFDM symbol except institute State other subcarriers outside b1 to bJ subcarrier.