WO2010148670A1

WO2010148670A1 - Method and apparatus for frequency offset estimation based on pilot and data

Info

Publication number: WO2010148670A1
Application number: PCT/CN2010/071177
Authority: WO
Inventors: 李萍
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-11-26
Filing date: 2010-03-22
Publication date: 2010-12-29
Also published as: CN102082744A; CN102082744B

Abstract

Disclosed is a method for frequency offset estimation based on pilot and data, which includes: obtaining a pilot bit frequency domain channel estimation value of a target user(s201); calculating the phase of the pilot channel estimation(s202); selecting a data symbol according to the phase of the pilot channel estimation, and obtaining the phase information caused by frequency offset according to the data symbol(s203); obtaining the residual phase difference according to the phase information and the phase of the pilot channel estimation(s204); obtaining a frequency offset value according to the residual phase difference(s205). Also disclosed is an apparatus for frequency offset estimation based on pilot and data. Through the present invention, the performance of receiver, i.e. frequency offset estimation ability, can be improved, the relative frequency offset between a base station and a terminal can be estimated effectively, the interference brought by destruction to the orthogonality of subcarrier in Orthogonal Frequency Division Multiplexing(OFDM) system can be reduced, the frequency offset estimation by the receiver and compensation ranges can be improved, especially when a large frequency offset exists in high-speed mobile environment links, the frequency offset value existing in the system can be estimated more accurately, reliable guarantee for the quality of communication service can be offered.

Description

Method and device for sum and number

This relates to the field of communication wood, and in particular to methods and apparatus related to the sum. Background

(TE, o gTe Evo o ) The project is the largest new wood project of the third generation partner (3GPP, Th dGe eaoe hp Oec), which enhances the air connection of the third generation communication wood (3G Th dGe eao ) . Compared with 3G, TE is more wood, and now has higher user number rate, grouping, lowering system, improving capacity and reducing costs.

The TE is healthy (O, O hogo a eq e cy v o tpex ) wood, O has a high utilization rate, and has many advantages, and the O system effectively resists the unshadowed. TE upside

The former sheep carrier (SC-A, S geC e eq e cy v o pex ). In the SC-A before the uplink, use T (cee o e Ta o a o ) to get it, then insert and move, and then move the letter and then ve e a o e Ta a o to reduce the power ratio of the terminal.

As for the multi-carrier system, the offset sub-channel of the carrier frequency is the same as that of the household. There are many sub-carriers in the O system, which are multi-messors. Because of the mutual mutual, there are higher requirements for the same carrier. Due to the terminal, Doppler is in the same household as the terminal, especially in the communication system, especially at high speed. Doppler will receive and the same family frequency, the receiving signal offset, the same carrier, so that the system increases.

The size of the Doppler and the magnitude of the phase velocity are the same. The same is true for the xvxco 6 6 terminal direction and the broadcast direction. V is the terminal speed C magnetic wave velocity carrier frequency.

In the TE system, at the speed of 15 m/h and below, the power user has the most powerful characteristics, while the power users with speeds of 15~12 m/h can provide high performance at speeds of 120. ~35 m/h work user

Each performance is not, and the user who is faster than 35 m/h does not. At high speeds, Doppler 40 z, and the terminal must support the foot

Wood can meet the requirements.

For reception, the same frequency is completed. The frequency is the function that must be completed. The terminal receives the special, locks the downlink frequency to send the uplink, and the uplink reception will have 2.

As shown in the schematic 1 of the existing terminal, the phase of the terminal and the phase are not different, the frequency of the terminal, the direction of the terminal, and the frequency received by the terminal, especially the frequency of the reception is 2, especially the terminal is approaching The direction of the terminal, the frequency received by the terminal is ten, and the frequency of reception is +2. The terminal is in the same direction, and the terminal is in the other direction. The frequency of the terminal appears, especially the frequency is ten, and the terminal will have 2 frequencies. 2 In the reception, the terminal reception will be small, and the large frequency offset will cause the communication to drop, especially in the high speed.

If not, the performance of the system will be greatly reduced, especially the larger (higher terminal speed), used in existing wood.

, making it possible to be small, high, and large, and its ability to decline.

Content

What is to be solved is to provide the method of sum and number to overcome the defects of the existing wood, the small size and the high defect.

For the above purposes, the present invention provides a method for sum and number, the method comprising the following steps

User's phase of the phase, the resulting phase information

The phase information and the phase residual phase, and the remaining phase.

The step of the user's value,

)

Public w

k) and , user's

among them,

1 letter, 2 letter,

1 receive sequence, 2 receive sequence, x force local, equal force, user. The phase step, the phase including the root formula " , ( , ) .

2 d h M

",,

Which, seeking, sO, a "2, an integer, makes

The phase of the

The phase is greater than 0, the left number

The phase is less than or equal to 0, the right one.

The phase is greater than 0, and the number of the left phase

The phase is less than or equal to 0, the number of the right phase.

The resulting phase information, Hugh

Renumbering the number of the , , , , and

The undecided multiplied by the judged gets the value, the numerical phase, and the resulting residual phase.

The step of the residual phase, the rest includes the root formula

1

, (left) k , (right number) residual phase ", where, the phase, The remaining phase, , user.

The step of the phase value includes a root A

搪 formula, where A residual phase,

2 X0.5X 0 /7X

The number of X and the same number.

In the step of the phase value, the method includes

Rooting the branch, the branch

Hugh

Smoothing the user's component, Q, within,

"", /

On the meson carrier

m

Average, average and hundred / hundred s

One A + X2

2 .

1

Formula aa/;

""

Wherein, the subcarriers of the phase are the same, branched,

. Integer of 10001000), of, A

And A

"Zhongtong, a is.

The average and the hundred steps, the rest includes the root formula

, 1st

Hundred days J

w , 1 day

Hundred J

Sx + m

The mean and the hundred, of which the force group, the middle element.

A device for sum and number is provided, the device includes an early frequency sheep, a phase of the user, a phase phase information of the sheep, a phase described by the root, and the phase information caused by the phase

The phase of the phase, the phase information and the phase of the residual phase

Sheep, Yugen said the remaining phase.

The device includes

Frequently biased sheep , the root of the sheep

Branch, the branch

Sheep, the combination of the branches of the roots.

The same phase as the number O D

Solid, and then use the solid combination, and improve the receiving and performance capabilities, can effectively the same phase with the terminal, reduce the OF system due to the subcarriers, improve the reception and solid, especially in the highway, The existence of the communication, each of the communication services provided a reliable. Description

1 is the indication in the existing wooden terminal

2 is the flow of the method of the sum and the number 3 is the flow of the method of the sum and the number 4 is the branch of the present

5 is an illustration of the device of the sum and the number. Hugh way

The following is a combination of and , the rest of the steps described. The following is a description, but it is not necessary to limit the solid.

The method of providing the sum and the number includes the following steps:

Phase, induced phase & phase information and phase residual phase residual phase.

Among them, the step of the user's value, Hugh includes Roots

Public w

Formula (k), and formula)

User's , where w k 1 letter , k 2 letter , 1 receive sequence, K

2 receiving sequence, X force local, uniform force, user.

The phase of the step, Hugh includes the formula, , k. Phase, of which, strive for, k) , one by one "2, integer, make, ).

twenty two

Phase of the steps, Hugh

The phase is greater than 0, and the left digit has a phase less than or equal to 0 and the right digit. The phase of the left phase is greater than 0, and the phase of the number of the left phase is less than or equal to 0, the number of the right phase. The number on the left and the number on the right refer to the number of the same number and the number in the meson.

The step of causing the phase information, the number of Hugh's, and the number of re-executions that are not determined by multiplying the judgement by the value, the numerical phase, and the resulting residual phase.

The step of the remaining phase, Hugh includes the root formula A (left)

1

), (right) the remaining phase, where , , , the phase, the remaining phase, , the user.

The phase value step, Hugh includes the root formula A, where A residual phase, X and 2 X0.55X 0 /7X

The number of the same number.

In the phase value step, near the root

Branch, branch of branch

. The step of combining the branches, Hugh includes the user's, (component Q, smooth inside, /

""h Mean on the carrier, average hundred and hundred formulas / hundred

AA ten

" 2 . 9 A

C "

ten

" , in which the subcarriers of the phase are the same, branched, ". The integers of 10001000), the same in AA and AA.

"

Average hundred and hundred steps, Hugh includes root formula

1 " ( h o

"",h,

" J, + ), 1 s< ,

" with

-

Z s x + 1 day G J h s ooh J mean and , where the force group, the middle element. The method of the sum and the number of the method 2, including the following steps

Step 2 1, User's. The middle and lower formulas and

Take the user's letter, where mk) 1 letter, k) 2, "1 receive sequence, 2 receive sequence, X k force local, uniform force, and channel phase characteristic phase containing 1 and 2, respectively information.

Step 202, the phase. In this, formula

1

And , , "

Phase of , , , , , , , , , (k)

", , one, one "2, an integer, make , ).

twenty two

Step 203, the phase,

The resulting phase information. In this case, the phase is greater than 0, the number of the left, the number of the left phase

The phase is less than 0 and the right is

, the number of right phases. If the phase of the result, >0, then the left and the left phase, to the force, for example, the up-and-down shared physics (SC, hy ca p S edCha e ), then

, , phase.

) )

If QPS is , then (s, if QPS is

) )

, then than B)

, "ha" indicates the verdict The function will be the number b; ha" re-force, constellation

" The same as the resolved star.

The undecided multiplied by the resulting numerical phase of the decision, the resulting residual phase, k) d " k)): . . ,

2 2 is a possible parameter.

Step 204, the phase of the phase information sum, the remaining phase. In this case, the formula Ap, k (left)

-

, , (Right) Remaining phase A, which from. , the phase, the remaining phase, .

Step 205, residual phase. In this, formula

w

Where Ad residual phase, X and 2 X0.55X 0 /7X

The number of the same number. In step 203, the phase of the result, 0, the right, the right phase, and the rest are the same.

The method of the sum and the number is shown in the method 3, wherein the step 201 205 in steps 301 to 305 is the same. Referring to 3, in step 305, the following steps are included

Step 5306, branching, branching. In this case, the branch is shown in the branch diagram 4, which is the branch boundary, and is the branch, and the branches are all parameters. Got it.

One nine nine, branch 2, heart

Branch 3 heart

< , branch 1, .

Step 5307, the combination of branches. In this, first, the user's letter and component Q are smoothed internally. Will be ", /

" The signal on the meson carrier, ie the formula

,

1 ""

(S x + ), <S< , < < , and

"

Hundred """ 刁

s + day 9, J W average hundred and hundred, which force group, medium element.

However, the letter k is combined. Before using the branch, it can be received separately, that is,

, can also be separately re-average, ie. This formula"

Nine A

C "

" , which strives for (ie, phase), the subcarriers of the phase are the same, the W branch, the integer of 1000), the same as . 1000

"And AA

"

5 of the sum of the number of devices As shown, including sheep, phase sheep, phase information sheep, Yu phase sheep, sheep,

Yang Yuan and Yang. The phase of the sheep

Sheep, phase information Yang Yuan and Yu phase sheep connection, Yu phase sheep separately phase information Yang Yuan and sheep connected, sheep respectively Yang Yuan and sheep connected.

Sheep to the user

Phase of the phase of the sheep in the phase of the sheep in the root ,

The phase information caused by the phase of the phase of the sheep and the phase of the phase information, the phase of the sheep, the root of the phase of the sheep in the branch of the root sheep, the branch of the branch of the sheep in the root branch.

The same phase as this O D

Solid, and then use the solid combination, and improve the receiving and performance capabilities, can effectively the same phase with the terminal, reduce the OF system due to the subcarriers, improve the receiving and solid, due to the use of the branching method, so greatly The addition of the terminal and the ability of the terminal, the reception of the school. Especially in the presence of large, high-speed roads, communication services provide reliable.

The above is the way of this. It is pointed out that ordinary wood in the field of wood has not been said. Under the premise of not using the principle of the invention, it is possible to make a number of and , and also the solid of vision.

Claims

A method of 1, and a sum, wherein the method comprises the following steps

The phase of the phase of the user, the phase information caused by the phase information and the phase residual phase, and the remaining phase.

2. The method of sum and number according to claim 1, wherein the step of the value of the user,

)

) , use

Household

Among them, k 1 letter, ) 2 letter, Y 1 receive sequence, 2 receive sequence, X k local, uniform force, user.

3. The method of sum and number according to claim 2, characterized in that the step of the phase,

1

, , ) . Phase

Dh M",

Among them,

h , k) , sO

A "2, integer, so".

4. The method of claim sum 3 as claimed in claim 3, characterized in that The phase, the rest

The phase is greater than 0, and the phase of the left digit is less than or equal to 0, the right one.

5. The method of claim 3 of claim 3, wherein the phase is greater than 0, and the phase of the left phase is less than or equal to 0, and the number of the right phase.

6. The method of sum and number described in claim 4, wherein the phase information is caused by

Renumbering the number of the , , , , and

7. The method of sum and number according to claim 6, wherein the step of the remaining phase,

1

Dp , ( left ) 1

A k , (right ) residual phase A , where , the phase, the remaining phase, , the user.

8. The method of summing the number of 7 is characterized by the step of the phase value comprising A , where the remaining phase, X 2 X0.5X 0 /7X

The same number as and .

9. The method of claim and the number of any of claims 1 to 8, wherein, in the step of the phase value, the method comprises: rooting the branch, the branch

10. The method of sum and number described in claim 9, which is characterized in that the step of combining,

The user's , component Q, smoothed on the o / 9 meson carrier

Average, average and hundred

Wherein, the subcarriers of the phase are the same, branched,

. Integer of 10001000), of, A

And A

"Zhongtong, a is.

11. The method of sum and number described in claim 10, characterized in that said average value and a hundred steps,

) "" "' Day G N

X J

( s x s ooh + )

2 Z sx 1 day 9, J h The mean and the hundred, of which the force group, the element.

12. The device of the sum and the number, wherein the device comprises

Early frequency sheep , the phase of the user 's phase , the phase phase information of the sheep , the phase described by the root , the resulting phase information

Sheep, Yugen said the remaining phase.

13. The device of claim 12, wherein the device comprises:

Frequently biased sheep , the root of the sheep

Branch, the branch

Sheep, the combination of the branches of the roots.