CN106302284B

CN106302284B - A kind of method and apparatus carrying out offset estimation

Info

Publication number: CN106302284B
Application number: CN201510272354.6A
Authority: CN
Inventors: 周海军; 李媛媛
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: Datang Gaohong Zhilian Technology (Chongqing) Co.,Ltd.
Priority date: 2015-05-25
Filing date: 2015-05-25
Publication date: 2019-06-07
Anticipated expiration: 2035-05-25
Also published as: CN106302284A; WO2016188273A1

Abstract

The present embodiments relate to wireless communication technology field, in particular to a kind of method and apparatus for carrying out offset estimation, to carry out offset estimation under high-speed mobile environment.The first kind frequency pilot sign of the embodiment of the present invention corresponds to the short symbol of multiple first kind, and the short symbol of the first kind is sent to receiving device by sending device；Receiving device carries out offset estimation according to the short symbol of the first kind.Receiving device directly carries out the mode of offset estimation according to first kind frequency pilot sign compared to the prior art, the embodiment of the present invention is due to carrying out offset estimation using the short symbol of the first kind, so as to improve the detection performance of signal, the offset estimation requirement under high-speed mobile environment can be preferably adapted to.

Description

A kind of method and apparatus carrying out offset estimation

Technical field

The present invention relates to wireless communication technology field, in particular to a kind of method and apparatus for carrying out offset estimation.

Background technique

In LTE (Long Term Evolution, long term evolution) system, what is taken is the central controlled mode of network, That is the uplink and downlink data of UE (user equipment) are all sent and received under the control of a network.Communication between UE and UE is It is forwarded by network and is controlled.Direct communication link is not present between UE and UE, UE does not also allow voluntarily to send uplink Data, referring to Figure 1A.

D2D (Device-to-Device, device-to-device), i.e. user equipment lead directly to technology, refer to that neighbouring user sets It is standby not need in short range in such a way that direct connected link carries out data transmission through central node (i.e. base station) It is forwarded, as shown in Figure 1B.

In 3GPP (3rd Generation Partnership Project, 3G (Third Generation) Moblie standardization body), D2D includes following two major classes close to service:

D2D discovery: UE confirms another UE using E-UTRA in its vicinity.For example, the clothes can be used in D2D UE Business comes the taxi of finding nearby, the friend of searching in its vicinity etc.；

D2D communication: UE close to each other will pass through network by directly establishing link between two UE originally in this way The communication link of transmission is converted into local direct communication link, saves a large amount of bandwidth and network efficiency；Or two phases Mutually close UE can use direct point-to-point data link to obtain the cheap communication service of stable high speed.It is general close to communication for service It is to be carried out under network controls or auxiliary, eNB (evolution base station) possibly even can be the UE carried out close to communication for service Dynamic distribution resource.

D2D communication at present is divided into two kinds of Linktypes:

D2D link: refer to the link directly communicated between equipment and equipment；

D2N link: the link communicated between equipment and network node.

D2D discovery/communication UE is participated in be divided to for two kinds of roles:

D2D sends UE: i.e. transmission D2D discovery/communication information UE；

D2D receives UE: i.e. reception D2D sends discovery/communication information UE that UE is sent.

In the D2D of 3GPP, data use SC-FDMA modulation system.The basic transmission unit TTI of data (Transmission Time Interval, transmission time interval) is 1ms, conventional CP (Cyclic Prefix, cyclic prefix) It down include 14 symbols, wherein symbol 4 and 11 is used as GP (protection interval) for carrying demodulation pilot tone, symbol 14.

Currently, the operative scenario of the D2D of 3GPP is mainly low speed environments, there is no consider to need under high-speed mobile environment.

Under high-speed mobile environment, it is assumed that carrier frequency be 5.9GHz, crystal oscillator stability be 0.1ppm, bicycle maximum move When dynamic speed is 160km/h, the opposite Doppler frequency shift of the maximum of two vehicles is 2.9KHz, between the two column pilot tones for estimating the frequency deviation Time interval 171us is not to be exceeded.And 3 intersymbol time intervals are 214us, 2 intersymbol time intervals are 143us。

In conclusion there is presently no a kind of for the scheme for carrying out offset estimation under high-speed mobile environment.

Summary of the invention

The present invention provides a kind of method and apparatus for carrying out offset estimation, estimates to carry out frequency deviation under high-speed mobile environment Meter.

A kind of method carrying out offset estimation provided in an embodiment of the present invention, this method comprises:

Transmitting terminal determines the corresponding each short symbol of the first kind of first kind frequency pilot sign；

For primary transmission, the transmitting terminal selects a short symbol of the first kind from all short symbols of the first kind；

The transmitting terminal sends the short symbol of the first kind of selection according to the corresponding transmission location of the first kind frequency pilot sign Number, so that receiving end carries out offset estimation according to the short symbol of the first kind.

Optionally, the transmitting terminal determines the corresponding transmission location of the first kind frequency pilot sign according to following manner:

The transmitting terminal is using at least one symbol in same subframe as the corresponding transmission of the first kind frequency pilot sign Position.

Optionally, at least one symbol in the same subframe includes the 6th symbol and the 11st symbol；Or

At least one symbol in the same subframe includes the 3rd symbol, the 7th symbol and the 11st symbol；Or

At least one symbol in the same subframe includes the 3rd symbol, the 6th symbol, the 9th symbol and the 12nd Symbol.

Optionally, the transmitting terminal determines the corresponding each short symbol of the first kind of first kind frequency pilot sign, comprising:

The transmitting terminal determines the corresponding each first kind short code of the first kind frequency pilot sign；

For a first kind short code, the transmitting terminal generates the short symbol of the first kind according to the first kind short code.

Optionally, the first kind frequency pilot sign corresponds to S group short code, and every group of short code includes R first kind short code；Or

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

Optionally, the transmitting terminal sends the short symbol of the first kind of selection, further includes:

The transmitting terminal determines the corresponding scrambling code of the short symbol of the first kind of selection；

The transmitting terminal is scrambled by the data that determining scrambling code pair is sent together with the short symbol of the first kind.

Optionally, this method further include:

The transmitting terminal determines the corresponding each short symbol of second class of the second class frequency pilot sign；

For primary transmission, the transmitting terminal selects a short symbol of the second class from all short symbols of second class；

The transmitting terminal sends the short symbol of the second class of selection according to the corresponding transmission location of the second class frequency pilot sign Number, so that receiving end carries out automatic growth control according to the short symbol of second class.

Optionally, the corresponding transmission location of the second class frequency pilot sign is the 1st symbol in subframe.

Optionally, this method further include:

The transmitting terminal determines the corresponding each short symbol of third class of third class frequency pilot sign；

For primary transmission, the transmitting terminal selects a short symbol of third class from all short symbols of third class；

The transmitting terminal sends the short symbol of third class of selection according to the corresponding transmission location of the third class frequency pilot sign Number, so that receiving end carries out time synchronization and frequency offset correction according to the short symbol of the third class.

Optionally, the corresponding transmission location of the second class frequency pilot sign is the 2nd symbol in subframe.

Optionally, the transmitting terminal determines the corresponding each short symbol of third class of third class frequency pilot sign, comprising:

The transmitting terminal determines the corresponding each third class short code of the third class frequency pilot sign；

For a third class short code, the transmitting terminal generates the short symbol of third class according to the third class short code.

Optionally, the corresponding any two third class short code cross correlation value of the third class frequency pilot sign is less than setting threshold Value；Or

Each third class short code in the third class frequency pilot sign is that the different time based on same sequence deviates to obtain 's.

Receiving end receives the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind be the transmitting terminal from It is selected in the corresponding all short symbols of the first kind of first kind frequency pilot sign；

The receiving end carries out offset estimation according to the short symbol of the first kind.

Optionally, the receiving end receives the short symbol of the first kind from transmitting terminal, comprising:

The receiving end receives the from transmitting terminal according at least one symbol for carrying the short symbol of the first kind in subframe A kind of short symbol.

Optionally, at least one symbol includes the 6th symbol and the 11st symbol in subframe；Or

At least one symbol includes the 3rd symbol, the 7th symbol and the 11st symbol in subframe；Or

At least one symbol includes the 3rd symbol, the 6th symbol, the 9th symbol and the 12nd symbol in subframe Number.

Optionally, before the short symbol of the first kind of the receiving end reception from transmitting terminal, further includes:

The receiving end receives the short symbol of the second class from transmitting terminal, wherein the short symbol of the second class is the transmission What end was selected from the corresponding all short symbols of second class of the second class frequency pilot sign；

This method further include:

The receiving end carries out automatic growth control according to the short symbol of second class.

The receiving end receives the short symbol of third class from transmitting terminal, wherein the short symbol of third class is the transmission What end was selected from the corresponding all short symbols of third class of third class frequency pilot sign；

This method further include:

The receiving end carries out time synchronization and frequency offset correction according to the short symbol of the third class.

Optionally, after the short symbol of the first kind of the receiving end reception from transmitting terminal, further includes:

The receiving end determines group serial number according to the short symbol of the third class, wherein including in described group corresponding group of serial number The corresponding first kind short code of the first kind frequency pilot sign, the first kind short code is for generating the short symbol of the first kind；

The receiving end is related to the first kind short code progress time domain in corresponding group of serial number of group by received data, determines Generate the first kind short code that the short symbol of the first kind received uses.

A kind of sending device carrying out offset estimation provided in an embodiment of the present invention, the sending device include:

Determining module, for determining the corresponding each short symbol of the first kind of first kind frequency pilot sign；

Selecting module, for for primary transmission, the transmitting terminal to select one from all short symbols of the first kind The short symbol of the first kind；

Sending module, for according to the corresponding transmission location of the first kind frequency pilot sign, the first kind for sending selection to be short Symbol, so that receiving end carries out offset estimation according to the short symbol of the first kind.

Optionally, the sending module is also used to, and determines the corresponding biography of the first kind frequency pilot sign according to following manner Defeated position:

Using at least one symbol in same subframe as the corresponding transmission location of the first kind frequency pilot sign.

Optionally, the determining module is specifically used for:

Determine the corresponding each first kind short code of the first kind frequency pilot sign；For a first kind short code, according to this First kind short code generates the short symbol of the first kind.

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

Optionally, the sending module is also used to:

Determine the corresponding scrambling code of the short symbol of the first kind of selection；Pass through determining scrambling code pair and the short symbol of the first kind Number data sent together are scrambled.

Optionally, the determining module is also used to:

Determine the corresponding each short symbol of second class of the second class frequency pilot sign；

The selecting module is also used to:

The sending module is also used to:

According to the corresponding transmission location of the second class frequency pilot sign, the short symbol of the second class of selection is sent, so as to receive End carries out automatic growth control according to the short symbol of second class.

Optionally, the determining module is also used to:

Determine the corresponding each short symbol of third class of third class frequency pilot sign；

The selecting module is also used to:

For primary transmission, a short symbol of third class is selected from all short symbols of third class；

The sending module is also used to:

According to the corresponding transmission location of the third class frequency pilot sign, the short symbol of third class of selection is sent, so as to receive End carries out time synchronization and frequency offset correction according to the short symbol of the third class.

Optionally, the determining module is specifically used for:

Determine the corresponding each third class short code of the third class frequency pilot sign；For a third class short code, according to this Third class short code generates the short symbol of third class.

A kind of receiving device carrying out offset estimation provided in an embodiment of the present invention, the receiving device include:

Receiving module, for receiving the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind is described What transmitting terminal was selected from the corresponding all short symbols of the first kind of first kind frequency pilot sign；

Processing module, for carrying out offset estimation according to the short symbol of the first kind.

Optionally, the receiving module is specifically used for:

According at least one symbol for carrying the short symbol of the first kind in subframe, the short symbol of the first kind from transmitting terminal is received Number.

Optionally, the receiving module is also used to:

Before receiving the short symbol of the first kind from transmitting terminal, the short symbol of the second class from transmitting terminal is received, wherein institute Stating the short symbol of the second class is that the transmitting terminal is selected from the corresponding all short symbols of second class of the second class frequency pilot sign；

The processing module is also used to:

Automatic growth control is carried out according to the short symbol of second class.

Optionally, the receiving module is also used to:

Before receiving the short symbol of the first kind from transmitting terminal, the short symbol of third class from transmitting terminal is received, wherein institute Stating the short symbol of third class is that the transmitting terminal is selected from the corresponding all short symbols of third class of third class frequency pilot sign；

The processing module is also used to:

Time synchronization and frequency offset correction are carried out according to the short symbol of the third class.

Optionally, the processing module is also used to:

Group serial number is determined according to the short symbol of the third class, wherein including the first kind in described group corresponding group of serial number The corresponding first kind short code of frequency pilot sign, the first kind short code is for generating the short symbol of the first kind；By received data It is related to the first kind short code progress time domain in corresponding group of group serial number, determine that the short symbol of the first kind for generating and receiving is adopted First kind short code.

The first kind frequency pilot sign of the embodiment of the present invention corresponds to the short symbol of multiple first kind, and sending device is by the short symbol of the first kind Number it is sent to receiving device；Receiving device carries out offset estimation according to the short symbol of the first kind.Receiving device compared to the prior art The mode of offset estimation is directly carried out according to first kind frequency pilot sign, the embodiment of the present invention using the short symbol of the first kind due to carrying out Offset estimation, so as to improve the detection performance of signal, the offset estimation that can preferably adapt under high-speed mobile environment is wanted It asks.

Detailed description of the invention

Figure 1A is the schematic diagram data of user equipment communication in background technique cellular network；

Figure 1B is the schematic diagram data of the direct-connected communication of background technique user equipment；

Fig. 2 is the system structure diagram that the embodiment of the present invention carries out offset estimation；

Fig. 3 is the first D2D data burst structural schematic diagram of the embodiment of the present invention；

Fig. 4 is the first data cutout window schematic diagram of the embodiment of the present invention；

Fig. 5 is second of data cutout window schematic diagram of the embodiment of the present invention；

Fig. 6 is second of D2D data burst structural schematic diagram of the embodiment of the present invention；

Fig. 7 is the third D2D data burst structural schematic diagram of the embodiment of the present invention；

Fig. 8 is the 4th kind of D2D data burst structural schematic diagram of the embodiment of the present invention；

Fig. 9 is the 5th kind of D2D data burst structural schematic diagram of the embodiment of the present invention；

Figure 10 is the 6th kind of D2D data burst structural schematic diagram of the embodiment of the present invention；

Figure 11 is the structural schematic diagram of the first sending device of the embodiment of the present invention；

Figure 12 is the structural schematic diagram of the first receiving device of the embodiment of the present invention；

Figure 13 is the structural schematic diagram of second of sending device of the embodiment of the present invention；

Figure 14 is the structural schematic diagram of second of receiving device of the embodiment of the present invention；

Figure 15 is a kind of method flow schematic diagram for carrying out offset estimation of the embodiment of the present invention；

Figure 16 is the method flow schematic diagram that another kind of the embodiment of the present invention carries out offset estimation.

Specific embodiment

The embodiment of the present invention is described in further detail with reference to the accompanying drawings of the specification.

As shown in Fig. 2, the system that the embodiment of the present invention carries out offset estimation includes:

Sending device 10, for determining the corresponding each short symbol of the first kind of first kind frequency pilot sign；It is transmitted for primary, A short symbol of the first kind is selected from all short symbols of the first kind；According to the corresponding transmission of the first kind frequency pilot sign Position sends the short symbol of the first kind of selection；

Receiving device 20, for receiving the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind is institute State what transmitting terminal was selected from the corresponding all short symbols of the first kind of first kind frequency pilot sign；According to the short symbol of the first kind into Row offset estimation.

Wherein, the transmitting terminal determines the corresponding each first kind short code of the first kind frequency pilot sign；

Specifically, the first kind short code length in first kind frequency pilot sign of the embodiment of the present invention is equal to data symbol in subframe K/1 of subcarrier occupied by (such as PUSCH symbol of LTE).

The first kind short code of the embodiment of the present invention can use zadoff-chu sequence construct, can also using M sequence or Other sequences building.

Specific building mode may refer to 36.211 agreement of 3GPP TS, and details are not described herein.

After obtaining first kind short code, by the equally spaced occupied son of write-in subframe of each element in first kind short code Carrier wave (be equal to data symbol used in subcarrier), is divided into K, and makees W point IFFT operation to obtain first kind short code corresponding The short symbol of the first kind.

First kind short code is repeated K times, the cyclic prefix that length is L (i) is added, just constitutes first kind frequency pilot sign.

Such as K=4, W=1024, L (1)=1104.

Ta (1)=STa (4,177) ... ..., STa (4,256), STa (1), STa (2), STa (3), STa (4), here STa (i)=STa.

Wherein, Tx (m) refers to m-th of Tx in subframe；Tx indicates the symbol of type x, such as first kind symbol, x 1； Tx (m, n) refers to the nth elements of m-th of Tx in subframe.The different value of i indicates different time-domain positions, or number.

The embodiment of the present invention carries out only using first kind frequency pilot sign during offset estimation, can also lead with other Frequency symbol carries out together, is introduced separately below.

Scheme one carries out being related to first kind frequency pilot sign and other frequency pilot signs during offset estimation.

Other frequency pilot signs of the embodiment of the present invention, including the second class frequency pilot sign and third class frequency pilot sign.

For the second class frequency pilot sign, the sending device determines the corresponding each short symbol of second class of the second class frequency pilot sign Number；

For primary transmission, the sending device selects a short symbol of the second class from all short symbols of second class Number；According to the corresponding transmission location of the second class frequency pilot sign, send the short symbol of the second class of selection so that receiving end according to The short symbol of second class carries out automatic growth control.

Correspondingly, receiving device is according to the second class frequency pilot sign automatic growth control.

The short symbol of second class in addition to for carrying out automatic growth control, can be also used for auxiliary carry out rough grade synchronization or The offset estimation of rough grade.

In an implementation, the transmitting terminal determines the corresponding each second class short code of the second class frequency pilot sign；

For a second class short code, the transmitting terminal generates the short symbol of the second class according to the second class short code.

Specifically, the second class short code length in the second class frequency pilot sign of the embodiment of the present invention is equal to data symbol in subframe N/1. of subcarrier occupied by (such as PUSCH symbol of LTE)

Second class short code of the embodiment of the present invention can use zadoff-chu sequence construct, can also using M sequence or Other sequences building.

After obtaining the second class short code, by the equally spaced occupied son of write-in subframe of each element in the second class short code Carrier wave (be equal to data symbol used in subcarrier), is divided into N, and makees W point IFFT operation to obtain the second class short code corresponding The short symbol of second class.

Second class short code is repeated into n times, the cyclic prefix that length is L (i) is added, just constitutes the second class frequency pilot sign.

For third class frequency pilot sign, the transmitting terminal determines the corresponding each short symbol of third class of third class frequency pilot sign Number；

For primary transmission, the transmitting terminal selects a short symbol of third class from all short symbols of third class； According to the corresponding transmission location of the third class frequency pilot sign, the short symbol of third class of selection is sent, so that receiving end is according to institute It states the short symbol of third class and carries out time synchronization and frequency offset correction.

Correspondingly, receiving end carries out time synchronization and frequency offset correction according to the short symbol of the third class.

Wherein, the short symbol of the first kind can be used for time synchronization.Compared to the short symbol of third class, the short symbol of the first kind can be with Carry out finer time synchronization.

In an implementation, the transmitting terminal determines the corresponding each third class short code of the third class frequency pilot sign；

Specifically, the third class short code length in third class frequency pilot sign of the embodiment of the present invention is equal to data symbol in subframe M/1. of subcarrier occupied by (such as PUSCH symbol of LTE)

The third class short code of the embodiment of the present invention can use zadoff-chu sequence construct, can also using M sequence or Other sequences building.

After obtaining third class short code, by the equally spaced occupied son of write-in subframe of each element in third class short code Carrier wave (be equal to data symbol used in subcarrier), is divided into M, and makees W point IFFT operation to obtain third class short code corresponding The short symbol of third class.

Third class short code is repeated M times, the cyclic prefix that length is L (i) is added, just constitutes third class frequency pilot sign.

Optionally, for scheme one, the first kind frequency pilot sign corresponds to S group short code, and every group of short code includes the R first kind Short code.

Sending device can select one group of short code when once being sent from S group short code, and from the group of selection A first kind short code is selected in R first kind short code.

The third class frequency pilot sign corresponds to the S different short symbols of third class.

Optionally, above-mentioned S can be identical as the synchronization level for needing to carry out, and so there is no need to set synchronization level reception It is standby.S can also be set to a preset value, such as 1, then synchronization level is needed through control information instruction.

In an implementation, control information, which can be put into the third symbol of subframe, sends.

Optionally, in order to preferably synchronize and reduce inter-user interference, the third class pilot tone of the embodiment of the present invention The corresponding any two third class short code cross correlation value of symbol (i.e. the cross correlation value of the forms of time and space of signal) is less than given threshold； Or each third class short code in the third class frequency pilot sign of the embodiment of the present invention is the different time based on same sequence What offset obtained.

Wherein, sending device, will be in same subframe when determining the corresponding transmission location of the first kind frequency pilot sign At least one symbol is as the corresponding transmission location of the first kind frequency pilot sign.

Optionally, at least one symbol in the same subframe here includes the 6th symbol and the 11st symbol.

Wherein, sending device is when determining the corresponding transmission location of the second class frequency pilot sign, by the 1st in subframe Symbol is as the corresponding transmission location of the second class frequency pilot sign.

Wherein, sending device is when determining the corresponding transmission location of the third class frequency pilot sign, by the 2nd in subframe Symbol is as the corresponding transmission location of the third class frequency pilot sign.

The specifically corresponding transmission location of first kind frequency pilot sign, the corresponding transmission location of the second class frequency pilot sign and third class The corresponding transmission location of frequency pilot sign may refer to Fig. 3.

It should be noted that the transmission location in Fig. 3 is merely illustrative, the equally applicable present invention of other transmission locations is real Apply example.Specifically the corresponding transmission location of every a kind of frequency pilot sign can be determined according to channel circumstance etc., can also be advised in the protocol It is fixed.

For receiving device, when receiving device detects that signal power is greater than setting threshold value, starting AGC is (automatic to increase Benefit control).

(threshold value can be automatic increasing after the duration that received signal power value is persistently greater than setting threshold value is greater than threshold value The time that benefit is completed very much in length and breadth), correlation is done with the short symbol of the second class or the short symbol of third class, determines the arrival time of signal.

Correlation is done with the short symbol of the second class:

With the time-domain signal of the short symbol of the second class to data are received, to do time domain related, after obtaining first relevant peaks, intercepts Data comprising 13 symbols including 1 short symbol before relevant peaks.The length of data cutout window can be according to thick synchronization accuracy It is adjusted, needs the data comprising complete symbol 2 to 13, specifically may refer to Fig. 4.

If carrying out the offset estimation of rough grade using the short symbol of the second class, can be realized by following equation:

F=angle (Pda)/Tb；

Wherein, F is Frequency Estimation initial value；Angle is phase pushing figure；Tb is the time span of the short symbol of the second class； Pda is correlation, and Pda=sum (conj (STb (1)) .*STb (2)), wherein STb (1) and STb (2) represents two adjacent The short symbol of two classes；Sum () summation, conj () seek conjugation, and .* indicates the product of two vectors.

Correlation is done with the short symbol of third class:

For the short symbol of third class, to do time domain related to data are received, and after obtaining first relevant peaks, interception is comprising related The data of 13 symbols before peak including half symbols, specifically may refer to Fig. 5.

When there is the short symbol of multiple third classes, need that do time domain related with each short symbol of third class to data are received, Using the maximum short symbol of third class of relevant peaks as the short symbol of third class used by transmission signal.

In an implementation, receiving device can carry out time synchronization using the short symbol of third class.

Specifically, receiving device does phase with the data in data cutout window with the time-domain signal of cascade third class symbol It closes, available fine clock.If the 2nd symbol that the short symbol of third class is placed in subframe sent, correlation peak location It is the initial position of symbol 2, the data in each symbol is intercepted based on the clock and carry out subsequent processing.

If the receiving device thick synchronization of the short symbol of the second class, and the quantity S of the above-mentioned short symbol of second class be greater than 1 when, Can be parallel do to the data in data cutout window is related, and obtaining the short symbol transmission of maximum correlation peak, data are practical uses Short symbol.

In an implementation, receiving device can be compared thick offset estimation (i.e. frequently for the first time using the short symbol of third class Estimation partially).

Assuming that sending device sends 2nd symbol of the short symbol of third class in subframe, receiving device is to the 2nd symbol In the short symbol of the second class be the FFT of W point, obtain frequency domain data.By the frequency domain of obtained frequency domain data and third type short code Data do correlation, it is estimated that the frequency deviation fobs of subcarrier integral multiple.With fobs to the second symbol to the time domain of the 13rd symbol Data do frequency deviation compensation, i.e., each time domain data dot product exp (- j*2*pi*fobs*n*ts), exp () is the index of e, when n is The number of domain point, ts are the time intervals of two neighboring time domain point.

Receiving device determines group serial number after determining the short symbol of third class received, according to the short symbol of the third class, will Received data are related to the first kind short code progress time domain in corresponding group of serial number of group, determine described first for generating and receiving The first kind short code that the short symbol of class uses.

Specifically, received data are carried out time domain phase with the first kind short code in corresponding group of serial number of group by receiving device It closes, the short code used when may determine that sending device sends data according to correlation peak location.After determining the short code used, root Frequency deviation and channel estimation are carried out according to determining short code.Further it is known that used in data after determining the short code used Scrambling code, and then the data received are descrambled.

Optionally, the arrival time that signal can also be further estimated according to correlation peak location, the fine tuning of time is realized.

When receiving device carries out offset estimation according to the short symbol of third class, it can use the two neighboring short symbol of third class and estimate Count out correlation Pdb:

Pdb=sum (conj (STb (1)) .*STb (2)), Sum () summation, conj () seek conjugation, and .* indicates two vectors Inner product.

According to above-mentioned formula correlation Pdc can also be determined using the short symbol of the first kind.

Offset estimation value can be calculated by following equation:

Foffset=angle (Pdb+Pdc)/T, wherein T is the time span of 1 short symbol；Angle is that phase is inclined It moves.

When receiving device carries out channel estimation according to the short symbol of the first kind, frequency deviation compensation is done to data using Foffset, and The interception short symbol of the first kind further is estimated with newest time of arrival (toa), and FFT operation is carried out to the short symbol of the first kind, it can be with The channel estimation value of the subcarrier of K is divided between obtaining.Interpolation, such as linear interpolation are done to these subcarriers, so that it may be owned The channel estimation value of subcarrier.

Optionally, when carrying out linear interpolation, it is assumed that the channel estimation value d (i) and d of known subcarrier i and subcarrier i+k (i+k), then the channel estimation value of subcarrier i+x is d (i)+(d (i+k)-d (i))/K*x.

In an implementation, above-mentioned W can take 1024, S that can take 3, R that can take 4.

The solution of the present invention one is illustrated by taking the bandwidth of 10Mhz as an example below.

Sending device can borrow method construct first kind short code, the second class short code and third class short code in LTE.

Specific method:

It is to meetLargest prime.

The setting of second class short code relevant parameter:

It is the occupied sub-carrier number of business datum, N=4.

U=0；

V=0；

The setting of third class short code relevant parameter:

U=0/10/20；

V=0；

The setting of first kind short code relevant parameter:

K=2

U=0/10/20；First kind short code and third class short code use identical u value in a subframe.

V=0.

Above-mentioned letter and the physical meaning of publicity may refer to 36.211 agreement of 3GPP TS, and details are not described herein.

In an implementation, first kind short code, the second class short code and the occupied subcarrier of third class short code are shared by data Subcarrier included, and subcarrier spacing is K, N, M, as shown in Figure 6.

In order to preferably do channel estimation, symbol 2,6 and 11 occupied sub-carrier positions can carry out centainly on frequency domain Staggeredly.

By the frequency-region signal of the frequency-region signal of first kind short code, the frequency-region signal of the second class short code and third class short code according to Each subcarrier of write-in, then does the IFFT operation of 1024/N, 1024/M, 1024/K, when obtaining corresponding short code respectively shown in Fig. 3 Domain signal.

Short code time-domain signal is repeated into N, M, K times, and the cyclic prefix for being L (i) -1024 plus length respectively, has been obtained Whole time-domain symbol.

The short symbol of the second class that second class short code generates is put into symbol 1, the short symbol of the second class that the second class short code generates It is put into symbol 2, the short symbol of the second class that the second class short code generates is put into symbol 6 and 11.

Scheme two carries out being related to first kind frequency pilot sign during offset estimation.

It needs system to have been established temporal synchronization in scheme two synchronous with frequency sub-carrier grade, is then inserted into subframe Some short symbols of the first kind are used for offset estimation and channel estimation.

For the generating process of first kind frequency pilot sign with scheme one, difference is the time domain of the short symbol insertion subframe of the first kind Character position is different.

The transmitting terminal is using at least one symbol in same subframe as the corresponding transmission of the first kind frequency pilot sign When position, at least one symbol in the same subframe includes the 3rd symbol, the 7th symbol and the 11st symbol, specifically may be used Referring to Fig. 7；Or at least one symbol in the same subframe includes the 3rd symbol, the 6th symbol, the 9th symbol and the 12 symbols, specifically may refer to Fig. 8.

It optionally, include R first kind short code in the first kind frequency pilot sign；Wherein R is positive integer.

In an implementation, terminal is random when sending data selects one from R basic symbol.Wherein, data are used Scrambling code and the first kind frequency pilot sign correspond.Terminal can thus be effectively reduced.

Specifically, the transmitting terminal determines the corresponding scrambling code of the short symbol of the first kind of selection；Pass through determining scrambling code The data sent together with the short symbol of the first kind are scrambled.

Receiving device interception includes the data of symbol 1 to 13

It is related that time domain is done with data and all possible third class short code in symbol X, can be sentenced according to correlation peak location It is disconnected to go out to send the practical short code used of data.

Pdc is estimated that using the third class short code in subframe, and the process for estimating Pdc is similar with scheme one, herein It repeats no more.

Calculate offset estimation value: Foffset=angle (Pdc)/T, T are the time spans of 1 short symbol.

The treatment process of receiving device may refer to a kind of receiving device of scheme to the treatment process of the short symbol of third class, This is repeated no more.

The solution of the present invention two is illustrated by taking the bandwidth of 10Mhz as an example below.

Sending device can borrow the method construct first kind short code in LTE, and detailed process is similar with scheme one, herein not It repeats again.

The occupied subcarrier of first kind short code subcarrier shared by data includes, and subcarrier spacing is K, specifically It may refer to Fig. 9 or Figure 10.

Sending device is identical with scheme one according to the process that the time-domain signal of first kind short code generates the short symbol of third class, Details are not described herein.Difference is in scheme two for the short symbol of third class to be added in symbol 3,7,11 or in 3,6,9,12.

As shown in figure 11, the first sending device of the embodiment of the present invention includes:

Determining module 1100, for determining the corresponding each short symbol of the first kind of first kind frequency pilot sign；

Selecting module 1101, for for primary transmission, the transmitting terminal to be selected from all short symbols of the first kind One short symbol of the first kind；

Sending module 1102, for sending the first of selection according to the corresponding transmission location of the first kind frequency pilot sign The short symbol of class, so that receiving end carries out offset estimation according to the short symbol of the first kind.

Optionally, the sending module 1102 is also used to, and determines that the first kind frequency pilot sign is corresponding according to following manner Transmission location:

Optionally, the determining module 1100 is specifically used for:

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

Optionally, the sending module 1102 is also used to:

Optionally, the determining module 1100 is also used to:

The selecting module 1101 is also used to:

The sending module 1102 is also used to:

Optionally, the determining module 1100 is also used to:

The selecting module 1101 is also used to:

The sending module 1102 is also used to:

Optionally, the determining module 1100 is specifically used for:

As shown in figure 12, the first receiving device of the embodiment of the present invention includes:

Receiving module 1200, for receiving the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind is What the transmitting terminal was selected from the corresponding all short symbols of the first kind of first kind frequency pilot sign；

Processing module 1201, for carrying out offset estimation according to the short symbol of the first kind.

Optionally, the receiving module 1200 is specifically used for:

Optionally, the receiving module 1200 is also used to:

The processing module 1201 is also used to:

Optionally, the receiving module 1200 is also used to:

The processing module 1201 is also used to:

Optionally, the processing module 1201 is also used to:

It should be noted that the embodiment of the present invention can be applied in D2D scene, then sending device and receiving device are eventually End.In different situations, sending device may also be used as receiving device, and receiving device may also be used as sending device.It is based on This, the sending device of the embodiment of the present invention and the function of receiving device can together with realize in entity, that is to say, that Tu11He The module of Figure 12 can be in an entity, and selection uses the function of sending device or the function of receiving device as needed.

As shown in figure 13, second of sending device of the embodiment of the present invention includes:

Processor 1301 executes following process for reading the program in memory 1304:

Determine the corresponding each short symbol of the first kind of first kind frequency pilot sign；For primary transmission, the transmitting terminal is from institute There is one short symbol of the first kind of selection in the short symbol of the first kind；According to the corresponding transmission position of the first kind frequency pilot sign It sets, the short symbol of the first kind that selection is sent by transceiver 1302, so that receiving end carries out frequency according to the short symbol of the first kind Estimation partially.

Transceiver 1302, for sending and receiving data under the control of processor 1301.

Optionally, the processor 1301 is also used to, and determines that the first kind frequency pilot sign is corresponding according to following manner Transmission location:

Optionally, the processor 1301 is specifically used for:

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

Optionally, the processor 1301 is also used to:

Determine the corresponding each short symbol of second class of the second class frequency pilot sign；For primary transmission, the transmitting terminal is from institute There is one short symbol of the second class of selection in the short symbol of the second class；According to the corresponding transmission position of the second class frequency pilot sign It sets, sends the short symbol of the second class of selection, so that receiving end carries out automatic growth control according to the short symbol of second class.

Optionally, the processor 1301 is also used to:

Determine the corresponding each short symbol of third class of third class frequency pilot sign；For primary transmission, from all thirds A short symbol of third class is selected in the short symbol of class；According to the corresponding transmission location of the third class frequency pilot sign, selection is sent The short symbol of third class so that receiving end carries out time synchronization and frequency offset correction according to the short symbol of the third class.

Optionally, the processor 1301 is specifically used for:

In Figure 13, bus architecture (is represented) with bus 1300, and bus 1300 may include any number of interconnection Bus and bridge, bus 1300 will include the one or more processors represented by processor 1301 and what memory 1304 represented deposits The various circuits of reservoir link together.Bus 1300 can also will peripheral equipment, voltage-stablizer and management circuit etc. Etc various other circuits link together, these are all it is known in the art, therefore, herein no longer carries out it into one Step description.Bus interface 1303 provides interface between bus 1300 and transceiver 1302.Transceiver 1302 can be a member Part is also possible to multiple element, such as multiple receivers and transmitter, provide for over a transmission medium with various other devices The unit of communication.The data handled through processor 1301 are transmitted on the radio medium by antenna 1305, further, antenna 1305 also receive data and transfer data to processor 1301.

Processor 1301 is responsible for management bus 1300 and common processing, can also provide various functions, including timing, outside Enclose interface, voltage adjusting, power management and other control functions.And memory 1304 can be used for storage processor 1301 The used data when executing operation.

Optionally, processor 1301 can be CPU (centre buries device), ASIC (Application Specific Integrated Circuit, specific integrated circuit), (Field-Programmable Gate Array, scene can compile FPGA Journey gate array) or CPLD (Complex Programmable Logic Device, Complex Programmable Logic Devices).

As shown in figure 14, second of receiving device of the embodiment of the present invention includes:

Processor 1401 executes following process for reading the program in memory 1404:

The short symbol of the first kind from transmitting terminal is received by transceiver 1402, wherein the short symbol of the first kind is described What transmitting terminal was selected from the corresponding all short symbols of the first kind of first kind frequency pilot sign；It is carried out according to the short symbol of the first kind Offset estimation.

Transceiver 1402, for sending and receiving data under the control of processor 1401.

Optionally, the processor 1401 is specifically used for:

Optionally, the processor 1401 is also used to:

Before receiving the short symbol of the first kind from transmitting terminal, the short symbol of the second class from transmitting terminal is received, wherein institute Stating the short symbol of the second class is that the transmitting terminal is selected from the corresponding all short symbols of second class of the second class frequency pilot sign；According to The short symbol of second class carries out automatic growth control.

Optionally, the processor 1401 is also used to:

Before receiving the short symbol of the first kind from transmitting terminal, the short symbol of third class from transmitting terminal is received, wherein institute Stating the short symbol of third class is that the transmitting terminal is selected from the corresponding all short symbols of third class of third class frequency pilot sign；According to The short symbol of third class carries out time synchronization and frequency offset correction.

Optionally, the processor 1401 is also used to:

In Figure 14, bus architecture (is represented) with bus 1400, and bus 1400 may include any number of interconnection Bus and bridge, bus 1400 will include the one or more processors represented by processor 1401 and what memory 1404 represented deposits The various circuits of reservoir link together.Bus 1400 can also will peripheral equipment, voltage-stablizer and management circuit etc. Etc various other circuits link together, these are all it is known in the art, therefore, herein no longer carries out it into one Step description.Bus interface 1403 provides interface between bus 1400 and transceiver 1402.Transceiver 1402 can be a member Part is also possible to multiple element, such as multiple receivers and transmitter, provide for over a transmission medium with various other devices The unit of communication.The data handled through processor 1401 are transmitted on the radio medium by antenna 1405, further, antenna 1405 also receive data and transfer data to processor 1401.

Processor 1401 is responsible for management bus 1400 and common processing, can also provide various functions, including timing, outside Enclose interface, voltage adjusting, power management and other control functions.And memory 1404 can be used for storage processor 1401 The used data when executing operation.

Optionally, processor 1401 can be CPU, ASIC, FPGA or CPLD.

It should be noted that the embodiment of the present invention can be applied in D2D scene, then sending device and receiving device are eventually End.In different situations, sending device may also be used as receiving device, and receiving device may also be used as sending device.It is based on This, the sending device of the embodiment of the present invention and the function of receiving device can together with realize in entity, that is to say, that Tu13He The module of Figure 14 can be in an entity, and selection uses the function of sending device or the function of receiving device as needed.Than Such as processor 1301 and processor 1401 can be synthesized into a processor；Transceiver 1302 and transceiver 1402 are synthesized one Transceiver；Memory 1304 and memory 1404 are synthesized into a memory.Other entities in Figure 13 and Figure 14 can also close At an entity.It is of course also possible to which the entity in Figure 13 and Figure 14 can not also synthesize an entity, for example there are two processing Device, there are two transceivers etc.；It can also partially synthetic be an entity, part does not synthesize an entity.

Based on the same inventive concept, the method for carrying out offset estimation is additionally provided in the embodiment of the present invention, due to this method The principle solved the problems, such as is similar to progress of the embodiment of the present invention system of offset estimation, therefore the implementation side of may refer to of this method The implementation of method, overlaps will not be repeated.

As shown in figure 15, a kind of method for carrying out offset estimation of the embodiment of the present invention includes:

Step 1500, transmitting terminal determine the corresponding each short symbol of the first kind of first kind frequency pilot sign；

Step 1501 is transmitted for primary, and the transmitting terminal selects one first from all short symbols of the first kind The short symbol of class；

Step 1502, the transmitting terminal send the of selection according to the corresponding transmission location of the first kind frequency pilot sign A kind of short symbol, so that receiving end carries out offset estimation according to the short symbol of the first kind.

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

Optionally, this method further include:

As described in Figure 16, the method for another kind of embodiment of the present invention progress offset estimation includes:

Step 1600, receiving end receive the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind is institute State what transmitting terminal was selected from the corresponding all short symbols of the first kind of first kind frequency pilot sign；

Step 1601, the receiving end carry out offset estimation according to the short symbol of the first kind.

Preferably, the receiving end receives the short symbol of the first kind from transmitting terminal, comprising:

Preferably, at least one symbol includes the 6th symbol and the 11st symbol in subframe；Or

Preferably, before the short symbol of the first kind of the receiving end reception from transmitting terminal, further includes:

This method further include:

Preferably, after the short symbol of the first kind of the receiving end reception from transmitting terminal, further includes:

It can be seen from the above: the first kind frequency pilot sign of the embodiment of the present invention corresponds to the short symbol of multiple first kind, The short symbol of the first kind is sent to receiving device by sending device；Receiving device carries out offset estimation according to the short symbol of the first kind.Phase Than in the prior art receiving device directly according to first kind frequency pilot sign carry out offset estimation mode, the embodiment of the present invention due to Offset estimation is carried out using the short symbol of the first kind, so as to improve the detection performance of signal, high speed can be preferably adapted to and move Offset estimation requirement under rotating ring border.

Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims

1. a kind of method for carrying out offset estimation, which is characterized in that this method comprises:

The transmitting terminal sends the short symbol of the first kind of selection according to the corresponding transmission location of the first kind frequency pilot sign, with Receiving end is set to carry out offset estimation according to the short symbol of the first kind；

Wherein, the transmitting terminal determines the corresponding each short symbol of the first kind of first kind frequency pilot sign, comprising:

2. the method as described in claim 1, which is characterized in that the transmitting terminal determines that the first kind is led according to following manner The corresponding transmission location of frequency symbol:

The transmitting terminal is using at least one symbol in same subframe as the corresponding transmission location of the first kind frequency pilot sign.

3. method according to claim 2, which is characterized in that at least one symbol in the same subframe includes the 6th Symbol and the 11st symbol；Or

At least one symbol in the same subframe includes the 3rd symbol, the 6th symbol, the 9th symbol and the 12nd symbol Number.

4. the method as described in claim 1, which is characterized in that the first kind frequency pilot sign corresponds to S group short code, every group of short code Including R first kind short code；Or

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

5. the method as described in claim 1, which is characterized in that the transmitting terminal sends the short symbol of the first kind of selection, also wraps It includes:

6. the method as described in claim 1, which is characterized in that this method further include:

The transmitting terminal sends the short symbol of the second class of selection according to the corresponding transmission location of the second class frequency pilot sign, with Receiving end is set to carry out automatic growth control according to the short symbol of second class.

7. method as claimed in claim 6, which is characterized in that the corresponding transmission location of the second class frequency pilot sign is subframe In the 1st symbol.

8. the method as described in claim 1~7 is any, which is characterized in that this method further include:

The transmitting terminal sends the short symbol of third class of selection according to the corresponding transmission location of the third class frequency pilot sign, with Receiving end is set to carry out time synchronization and frequency offset correction according to the short symbol of the third class.

9. method according to claim 8, which is characterized in that the corresponding transmission location of the third class frequency pilot sign is subframe In the 2nd symbol.

10. method according to claim 8, which is characterized in that the transmitting terminal determines that third class frequency pilot sign is corresponding every A short symbol of third class, comprising:

11. method as claimed in claim 10, which is characterized in that the corresponding any two third of the third class frequency pilot sign Class short code cross correlation value is less than given threshold；Or

Each third class short code in the third class frequency pilot sign is that the different time based on same sequence deviates.

12. a kind of method for carrying out offset estimation, which is characterized in that this method comprises:

Receiving end receives the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind is the transmitting terminal from first It is selected in the corresponding all short symbols of the first kind of class frequency pilot sign；

The receiving end carries out offset estimation according to the short symbol of the first kind；

Wherein, the corresponding first kind short code of first kind frequency pilot sign that the short symbol of the first kind is determined according to the transmitting terminal is raw At.

13. method as claimed in claim 12, which is characterized in that the receiving end receives the short symbol of the first kind from transmitting terminal Number, comprising:

The receiving end receives the first kind from transmitting terminal according at least one symbol for carrying the short symbol of the first kind in subframe Short symbol.

14. method as claimed in claim 13, which is characterized in that at least one symbol includes the 6th symbol in subframe Number and the 11st symbol；Or

At least one symbol includes the 3rd symbol, the 6th symbol, the 9th symbol and the 12nd symbol in subframe.

15. method as claimed in claim 13, which is characterized in that the receiving end receives the short symbol of the first kind from transmitting terminal Before number, further includes:

The receiving end receives the short symbol of the second class from transmitting terminal, wherein the short symbol of the second class be the transmitting terminal from It is selected in the corresponding all short symbols of second class of second class frequency pilot sign；

This method further include:

16. method as claimed in claim 13, which is characterized in that the receiving end receives the short symbol of the first kind from transmitting terminal Before number, further includes:

The receiving end receives the short symbol of third class from transmitting terminal, wherein the short symbol of third class be the transmitting terminal from It is selected in the corresponding all short symbols of third class of third class frequency pilot sign；

This method further include:

17. the method described in claim 16, which is characterized in that the receiving end receives the short symbol of the first kind from transmitting terminal After number, further includes:

The receiving end determines group serial number according to the short symbol of the third class, wherein including described in described group corresponding group of serial number The corresponding first kind short code of first kind frequency pilot sign, the first kind short code is for generating the short symbol of the first kind；

The receiving end is related to the first kind short code progress time domain in corresponding group of serial number of group by received data, determines and generates The first kind short code that the short symbol of the first kind received uses.

18. a kind of sending device for carrying out offset estimation, which is characterized in that the sending device includes:

Selecting module, for for primary transmission, the transmitting terminal to select one first from all short symbols of the first kind The short symbol of class；

Sending module, for sending the short symbol of the first kind of selection according to the corresponding transmission location of the first kind frequency pilot sign, So that receiving end carries out offset estimation according to the short symbol of the first kind；

Wherein, the determining module is specifically used for:

Determine the corresponding each first kind short code of the first kind frequency pilot sign；For a first kind short code, according to this first Class short code generates the short symbol of the first kind.

19. sending device as claimed in claim 18, which is characterized in that the sending module is also used to, according to following manner Determine the corresponding transmission location of the first kind frequency pilot sign:

20. sending device as claimed in claim 19, which is characterized in that at least one symbol in the same subframe includes 6th symbol and the 11st symbol；Or

21. sending device as claimed in claim 19, which is characterized in that the first kind frequency pilot sign corresponds to S group short code, often Group short code includes R first kind short code；Or

It include R first kind short code in the first kind frequency pilot sign；

Wherein, S and R is positive integer.

22. sending device as claimed in claim 18, which is characterized in that the sending module is also used to:

Determine the corresponding scrambling code of the short symbol of the first kind of selection；Pass through determining scrambling code pair and the short symbol one of the first kind The data sent are acted to be scrambled.

23. sending device as claimed in claim 18, which is characterized in that the determining module is also used to:

The selecting module is also used to:

The sending module is also used to:

According to the corresponding transmission location of the second class frequency pilot sign, the short symbol of the second class of selection is sent, so that receiving end root Automatic growth control is carried out according to the short symbol of second class.

24. sending device as claimed in claim 23, which is characterized in that the corresponding transmission location of the second class frequency pilot sign For the 1st symbol in subframe.

25. the sending device as described in claim 18~24 is any, which is characterized in that the determining module is also used to:

The selecting module is also used to:

The sending module is also used to:

According to the corresponding transmission location of the third class frequency pilot sign, the short symbol of third class of selection is sent, so that receiving end root Time synchronization and frequency offset correction are carried out according to the short symbol of the third class.

26. sending device as claimed in claim 25, which is characterized in that the corresponding transmission location of the third class frequency pilot sign For the 2nd symbol in subframe.

27. sending device as claimed in claim 25, which is characterized in that the determining module is specifically used for:

Determine the corresponding each third class short code of the third class frequency pilot sign；For a third class short code, according to the third Class short code generates the short symbol of third class.

28. sending device as claimed in claim 27, which is characterized in that the corresponding any two of the third class frequency pilot sign Third class short code cross correlation value is less than given threshold；Or

29. a kind of receiving device for carrying out offset estimation, which is characterized in that the receiving device includes:

Receiving module, for receiving the short symbol of the first kind from transmitting terminal, wherein the short symbol of the first kind is the transmission What end was selected from the corresponding all short symbols of the first kind of first kind frequency pilot sign；

Processing module, for carrying out offset estimation according to the short symbol of the first kind；

30. receiving device as claimed in claim 29, which is characterized in that the receiving module is specifically used for:

According at least one symbol for carrying the short symbol of the first kind in subframe, the short symbol of the first kind from transmitting terminal is received.

31. receiving device as claimed in claim 30, which is characterized in that at least one symbol includes the 6 in subframe A symbol and the 11st symbol；Or

32. receiving device as claimed in claim 30, which is characterized in that the receiving module is also used to:

Before receiving the short symbol of the first kind from transmitting terminal, the short symbol of the second class from transmitting terminal is received, wherein described the The short symbol of two classes is that the transmitting terminal is selected from the corresponding all short symbols of second class of the second class frequency pilot sign；

The processing module is also used to:

33. receiving device as claimed in claim 30, which is characterized in that the receiving module is also used to:

Before receiving the short symbol of the first kind from transmitting terminal, the short symbol of third class from transmitting terminal is received, wherein described the The short symbol of three classes is that the transmitting terminal is selected from the corresponding all short symbols of third class of third class frequency pilot sign；

The processing module is also used to:

34. receiving device as claimed in claim 33, which is characterized in that the processing module is also used to:

Group serial number is determined according to the short symbol of the third class, wherein including the first kind pilot tone in described group corresponding group of serial number The corresponding first kind short code of symbol, the first kind short code is for generating the short symbol of the first kind；By received data and group First kind short code in corresponding group of serial number carries out time domain correlation, determines what the short symbol of the first kind for generating and receiving used First kind short code.