CN107465640A

CN107465640A - The transmission of data cell, processing method and processing device, website

Info

Publication number: CN107465640A
Application number: CN201610389262.0A
Authority: CN
Inventors: 张博; 邢卫民; 姚珂
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-06-03
Filing date: 2016-06-03
Publication date: 2017-12-12
Also published as: WO2017206963A1

Abstract

The invention provides a kind of transmission of data cell, processing method and processing device, website；Wherein, sending method includes：Data cell is generated, wherein, the data field in data cell includes one or more orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one or more OFDM symbol in each OFDM symbol block；Leading part in the data cell includes：For indicating the displacement pilot frequency information of the OFDM symbol in the data field in each OFDM symbol block, data cell is sent.By the present invention, solve in correlation technique in the case of OFDMA or MU MIMO, due to channel variation causes website can not update channel information in same data cell caused by environment Doppler frequency shift the problem of.

Description

The transmission of data cell, processing method and processing device, website

Technical field

The present invention relates to the communications field, in particular to a kind of transmission of data cell, processing method and processing device, stands Point.

Background technology

Mainly contained in WLAN (Wireless Local Area Networks, abbreviation WLAN) communication 802.11 serial protocols, all it is to support higher band from 802.11a/g/n/ac until from the point of view of current 802.11ax evolution Width, more users and higher speed, the network of more crypto set, have stronger robustness for environment.

In the phase offset that Antagonistic Environment problem is brought, number that 802.11 agreements are each sent since most in physical layer According to the addition of pilot tone in symbol, for correcting the phase offset of each symbol, the other phase tracking of symbol level is done, site STA exists The data cell of transmitting terminal transmission is received, the channel estimation obtained in lead code by training sequence is applied to the data sheet Data field does signal detection in member.But between complex environment, such as AP and site STA due to environmental change such as Doppler frequency shift, physical layer send a longer data cell, and the channel between AP and website can change, physical layer data Lead code estimates obtained channel information in unit, is not particularly suited for the data solution of the latter half of data unit data field Analysis.

There is traveling pilot (migration pilot tone) concept in 802.11ah at present, i.e., by physical layer data list Change each data subcarrier of position searching loop of each pilot tone in member in data symbol, do not increase data cell expense In the case of, new channel information is obtained by the symbol of data field inside a data cell and is applied to the data sheet The further part of data field in member, but this method has been limited in processing of the single user using single data stream in whole bandwidth. The characteristic of OFDMA multi-user is introduced in 11ax, i.e., whole bandwidth is cut into multiple resource blocks, each resource block corresponding one Individual user, and each user has single or multiple data flows, different RU pilot tone pattern is different, in OFDMA or MU-MIMO In the case of, the channel variation caused by doppler environments frequency displacement, website can not be updated the data in unit by former method Channel information.

For the above-mentioned technical problem in correlation technique, effective solution is not yet proposed at present.

The content of the invention

The embodiments of the invention provide a kind of transmission of data cell, processing method and processing device, website, at least to solve phase In the technology of pass in the case of OFDMA or MU-MIMO, the channel variation caused by environment Doppler frequency shift make it that website can not be The problem of channel information is updated in same data cell.

According to one embodiment of present invention, there is provided a kind of sending method of data cell, including：Generate data sheet Member, wherein, the data field in data cell includes one or more orthogonal frequency division multiplex OFDM symbolic blocks, wherein, each One or more OFDM symbol is included in the OFDM symbol block；Leading part in the data cell includes：For referring to Show the displacement pilot frequency information of the OFDM symbol in the data field in each OFDM symbol block；Send data cell.

Alternatively, before data cell is generated, methods described also includes：The trigger frame that access website is sent is received, its In, the trigger frame includes the configured information that each website being used in the multiple website generates the data cell；Wherein, The configured information includes the displacement pilot frequency information；Generation data cell includes：The number is generated according to the configured information According to unit.

Alternatively, the displacement pilot frequency information includes at least one of：Displacement pilot interval, wherein, between displacement pilot tone Every the interval for indicating pilot sub-carrier corresponding to adjacent orthogonal frequency division multiplex OFDM symbol in the data field；Displacement is led Frequency cycle period, wherein, it is all that displacement pilot tone cycle period is used to indicate that the pilot sub-carrier in the data field to have traveled through The number of OFDM symbol passed through of data subcarrier；For the displacement pilot tone processing for the website for indicating to participate in multi-user transmission Pattern.

Alternatively, the data cell is sent by least one of mode：Single current orthogonal frequency-time multiple access OFDMA Multiuser mode, multithread OFDMA multiuser modes, multiple-input and multiple-output MIMO method.

Alternatively, the displacement pilot tone tupe includes, and resource unit corresponding to the website in multiple websites is using system One displacement pilot tone processing mode, or resource unit corresponding to each website in multiple websites use independent displacement pilot tone Processing mode.

Alternatively, the number of the sub- carrier frequency of data in resource unit corresponding to each website in the multiple website with When the ratio between number of pilot sub-carrier is identical, the displacement pilot frequency mode is to be provided corresponding to each website in the multiple website Source unit uses unified displacement pilot tone processing mode；The number of resource unit corresponding to each website in the multiple website When being differed according to the number of sub- carrier frequency and the ratio between the number of pilot sub-carrier, the displacement pilot frequency mode is in the multiple website Each website corresponding to resource unit use independent displacement pilot tone processing mode.

Alternatively, the number of the OFDM symbol in each OFDM symbol block is equal to the signaling word in the leading part The number of indicated empty time stream in section, where the pilot subcarrier positions of the OFDM symbol in same OFDM symbol block Sub-carrier indices are identicals.

Alternatively, the pilot sub-carrier position of OFDM symbol in each OFDM symbol block is determined by least one of mode The value put：Determined using projection matrix and pilot frequency sequence；Will be corresponding in the long training sequence of training field in the data cell Value of the value of sub-carrier positions as the pilot subcarrier positions of OFDM symbol in each OFDM symbol block.

According to one embodiment of present invention, there is provided a kind of processing method of data cell, including：Receive the first website The data cell of transmission, wherein, the data field in data cell includes one or more orthogonal frequency division multiplex OFDM symbol Block, wherein, include one or more OFDM symbol in each OFDM symbol block；Leading part in the data cell Including：For indicating the displacement pilot frequency information of the OFDM symbol in the data field in each OFDM symbol block；According to The displacement pilot frequency information updates the channel information of resource unit corresponding with the second website.

Alternatively, the displacement pilot frequency information includes at least one of：Displacement pilot interval, wherein, the displacement is led Frequency is spaced for indicating pilot tone corresponding to adjacent orthogonal frequency division multiplex OFDM symbol in the data field in the data cell The interval of carrier wave；Displacement pilot tone cycle period, wherein, the displacement pilot tone cycle period is used to indicate in the data field Pilot sub-carrier has traveled through the number for the OFDM symbol that all data subcarriers are passed through；For indicating to participate in multi-user transmission Website displacement pilot tone tupe.

Alternatively, the displacement pilot tone tupe includes, and resource unit corresponding to each website in multiple websites is adopted With unified displacement pilot tone processing mode, or resource unit corresponding to each website in multiple websites uses independent displacement Pilot tone processing mode.

Alternatively, the number of the sub- carrier frequency of data of resource unit corresponding to each website in the multiple website is with leading When the ratio between the number of frequency subcarrier is identical, the displacement pilot frequency mode is resource corresponding to each website in the multiple website Unit uses unified displacement pilot tone processing mode；The data of resource unit corresponding to each website in the multiple website When the ratio between the number of sub- carrier frequency and the number of pilot sub-carrier differ, the displacement pilot frequency mode is in the multiple website Resource unit corresponding to each website uses independent displacement pilot tone processing mode.

Alternatively, the displacement pilot frequency information is carried in the signaling field of the leading part.

Alternatively, the channel information bag of resource unit corresponding with the second website is updated according to the displacement pilot frequency information Include：The position of the pilot sub-carrier of the OFDM symbol in the data cell in data field is obtained according to the displacement pilot frequency information Put；The channel information is updated according to the pilot sub-carrier in the position.

Alternatively, updating the channel information according to the pilot sub-carrier in the position includes：By described Training data in data cell in lead code obtains the initial channel estimation of resource unit corresponding to second website；Utilize The initial channel estimation parses first OFDM symbol in data field in the data cell；With first OFDM Symbol performs following processing procedure, estimated until having updated the initial channel as the starting point for updating the initial channel information It is calculated as stopping：Using the pilot sub-carrier estimating channel information of the n-th OFDM symbol in the data field, the first channel is obtained Information；Obtained first channel information is replaced corresponding with the n-th OFDM symbol in the initial channel estimation Channel information, the initial channel estimation after being updated；Wherein, the initial channel estimation after the renewal is used to parse the number According to the N+1 OFDM symbol in field；Wherein, 1<N<T, N are integer, and T is the displacement pilot tone cycle period.

Alternatively, updating the channel information according to the pilot sub-carrier in the position includes：By described Training data in data cell in lead code obtains the initial channel estimation of resource unit corresponding to second website；Utilize The initial channel estimation demodulates the 1st to M OFDM symbol of the data field in the data cell；With the data field In M OFDM symbol be unit, using the 1st to M OFDM symbol of the data field as starting point, perform following treated Journey, untill the initial channel estimation has been updated：Estimate that channel is believed respectively using the pilot sub-carrier of M OFDM symbol Breath, obtains M channel information；By the M channel information replace in the initial channel estimation with the M OFDM symbol pair The channel information answered, the initial channel estimation after being updated；Wherein, the initial channel estimation after the renewal is used to demodulate institute State M OFDM symbol after the M OFDM symbol in data field；Wherein, 1 ＜ M ＜ T, M is integer, and T is the displacement Pilot tone cycle period.

Alternatively, data cell is received by least one of method：Single current orthogonal frequency-time multiple access OFDMA side Formula, multithread OFDMA modes, multiple-input and multiple-output MIMO method.

According to one embodiment of present invention, there is provided a kind of dispensing device of data cell, including：Generation module, use In generation data cell, wherein, the data field in the data cell includes one or more orthogonal frequency division multiplex OFDM Symbolic blocks, wherein, include one or more OFDM symbol in each OFDM symbol block；It is leading in the data cell Part includes：For indicating the displacement pilot frequency information of the OFDM symbol in the data field in each OFDM symbol block； Sending module, for sending the data cell.

According to one embodiment of present invention, there is provided a kind of reception device of data cell, including：Receiving module, use In the data cell for receiving the transmission of the first website, wherein, the data field in the data cell is including one or more just Frequency division multiplex OFDM symbolic blocks are handed over, wherein, include one or more OFDM symbol in each OFDM symbol block；The number Include according to the leading part in unit：For indicating the OFDM symbol in the data field in each OFDM symbol block Displacement pilot frequency information；Update module, for updating the channel of resource unit corresponding with the second website according to displacement pilot frequency information Information.

According to one embodiment of present invention, there is provided a kind of website, including above-mentioned dispensing device.

According to one embodiment of present invention, there is provided a kind of website, including above-mentioned processing unit.

According to still another embodiment of the invention, a kind of storage medium is additionally provided.The storage medium is arranged to storage and used In the program code for performing following steps：Data cell is generated, wherein, the data field in data cell is including one or more Individual orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one or more OFDM symbol in each OFDM symbol block；Institute The leading part stated in data cell includes：For indicating the OFDM symbols in the data field in each OFDM symbol block Number displacement pilot frequency information.

By the present invention, it is used for due to being provided with data cell in indicator data field in each OFDM symbol block The displacement pilot frequency information of OFDM symbol, and then cause when doppler environments frequency displacement causes channel variation, the displacement can be utilized Pilot frequency information is updated channel information, solves in correlation technique in the case of OFDMA or MU-MIMO, because how general environment is The problem of channel variation caused by strangling frequency displacement causes website can not update channel information in same data cell.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the network architecture schematic diagram of the WLAN communication system multi-user transmissions provided according to embodiments of the present invention；

Fig. 2 is the flow chart of the sending method of data cell according to embodiments of the present invention；

Fig. 3 is the schematic diagram of the unified displacement pilot tone processing mode provided according to embodiments of the present invention；

Fig. 4 is the schematic diagram that multi-user's displacement pilot tone independently indicates under the OFDMA provided according to embodiments of the present invention；

Fig. 5 is the flow chart of the processing method of data cell according to embodiments of the present invention；

Fig. 6 is the schematic diagram that the resource block of the complete bandwidth provided according to the preferred embodiment of the present invention distributes；

Fig. 7 is that the displacement of the complete bandwidth i+1 symbol displacement pilot tone provided according to the preferred embodiment of the present invention is illustrated Figure；

Fig. 8 is the schematic diagram of the displacement pilot distribution of any two RU independences provided according to the preferred embodiment of the present invention；

Fig. 9 is the schematic diagram of the more empty time stream displacement pilot tones provided according to the preferred embodiment of the present invention；

Figure 10 is the structured flowchart of the dispensing device of data cell according to embodiments of the present invention；

Figure 11 is the structured flowchart of the reception device of data cell according to embodiments of the present invention.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting In the case of, the feature in embodiment and embodiment in the application can be mutually combined.

It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, " Two " etc. be for distinguishing similar object, without for describing specific order or precedence.

Embodiment 1

The embodiment of the present application can run on the network of multi-user transmission in the network architecture WLAN communication systems shown in Fig. 1 On framework, as shown in figure 1, the network architecture includes：Access website (Access Point, abbreviation AP), multiple websites (Station, abbreviation STA), wherein, it can be in communication with each other between access website and multiple websites, i.e., access website can be to more Individual website sends information, and each website in multiple websites can also send information to access website.

A kind of sending method of the data cell run in the above-mentioned network architecture is provided in the present embodiment, and Fig. 2 is The flow chart of the sending method of data cell according to embodiments of the present invention, as shown in Fig. 2 the flow comprises the following steps：

Step S202, data cell is generated, wherein, the data field in data cell includes one or more orthogonal frequency Divide multiplexing OFDM symbol block, wherein, include one or more OFDM symbol in each OFDM symbol block；The data sheet Leading part in member includes：For indicating the displacement of the OFDM symbol in the data field in each OFDM symbol block Pilot frequency information；

Step S204, send above-mentioned data cell.

By above-mentioned steps, due to being provided with the displacement pilot tone for being used for updating resource unit channel information in data cell Information, and then cause when doppler environments frequency displacement causes channel variation, displacement pilot frequency information renewal channel letter can be utilized Breath, is solved in correlation technique in the case of OFDMA or MU-MIMO, channel variation makes caused by environment Doppler frequency shift Obtain the problem of website can not update channel information in same data cell.

It should be noted that above-mentioned steps S202 can be performed individually, execution can also be combined with above-mentioned steps S204, In the case that step S202 is individually performed, can also solve above-mentioned technical problem.

In one embodiment of the invention, at least one of information is also included in above-mentioned data cell：Resource unit Distribution information, each resource unit space-time flow amount, be used to indicate whether Doppler's bit using displacement pilot tone.Need It is noted that the distribution information of above-mentioned resource unit can be the corresponding relation between resource unit and website, i.e. access station Which resource block that point distributes to different websites, but it is not limited to this.

It should be noted that an OFDM symbol, which corresponds to frequency domain, can include multiple data subcarriers and/or pilot tone Carrier wave；These data subcarriers and/or pilot sub-carrier are divided into multiple resource units, each resource unit include one or The multiple data subcarriers of person and/or pilot sub-carrier, each resource unit can correspond to user's (website).

It should be noted that the above method can apply to descending multi-user transmission, uplink multi-users can also be applied to Transmission, but it is not limited to this.

In one embodiment of the invention, when the above method is applied to uplink multi-users transmission, in generation data sheet Before member, methods described also includes：The trigger frame that access website is sent is received, wherein, the trigger frame is included for described more Each website in individual website generates the configured information of the data cell；Wherein, the configured information is led including the displacement Frequency information；Generation data cell includes：The data cell is generated according to the configured information.

It should be noted that above-mentioned displacement pilot frequency information includes at least one of：Displacement pilot interval, wherein, it is described Displacement pilot interval is used to indicate pilot sub-carrier corresponding to adjacent orthogonal frequency division multiplex OFDM symbol in the data field Interval；Displacement pilot tone cycle period, wherein, pilot tone that the displacement pilot tone cycle period is used to indicate in the data field Carrier wave has traveled through the number for the OFDM symbol that all data subcarriers are passed through；For indicating the website of participation multi-user transmission Displacement pilot tone tupe.

It should be noted that the interval of the pilot sub-carrier of above-mentioned adjacent OFDM symbol can be according between above-mentioned displacement pilot tone Every being arranged to one or more subcarrier, but it is not limited to this.

It should be noted that the data cell can be sent by least one of mode：Single current orthogonal frequency is more Location access OFDMA multiuser modes, multithread OFDMA multiuser modes, multiple-input and multiple-output MIMO method.

It should be noted that OFDMA modes can refer to that different users is transmitted using different frequency resources.

It should be noted that displacement pilot tone tupe includes, resource unit corresponding to each website in multiple websites Using unified displacement pilot tone processing mode, or resource unit corresponding to each website in multiple websites uses independent position Move pilot tone processing mode.The number of the sub- carrier frequency of data of resource unit corresponding to each website in multiple websites and pilot tone When the ratio between number of carrier wave is identical, displacement pilot frequency mode is resource unit corresponding to each website in multiple websites using unified Displacement pilot tone processing mode；The number of the sub- carrier frequency of data of resource unit corresponding to each website in multiple websites is with leading When the ratio between number of frequency subcarrier differs, displacement pilot frequency mode is adopted for resource unit corresponding to each website in multiple websites With independent displacement pilot tone processing mode.

It should be noted that Fig. 3 is the signal of the unified displacement pilot tone processing mode provided according to embodiments of the present invention Figure, as shown in figure 3, the displacement pilot tone configured information of resource block corresponding to multiple users is indicated using identical bit, Fig. 4 It is the schematic diagram that multi-user's displacement pilot tone independently indicates under the OFDMA provided according to embodiments of the present invention, as shown in figure 4, each The pilot sub-carrier that resource block can show as each resource block using independent displacement pilot tone processing mode carries out independent instruction.

In one embodiment of the invention, above-mentioned displacement pilot frequency information carries the signaling word in the lead code of data cell Duan Zhong.

In one embodiment of the invention, the number of the OFDM symbol in each OFDM symbol block be equal to it is described before Lead the number of empty time stream indicated in the signaling field in part, the pilot tone of the OFDM symbol in same OFDM symbol block Sub-carrier indices where sub-carrier positions are identicals.

It should be noted that leading for OFDM symbol in each OFDM symbol block can be determined by least one of mode The value of frequency sub-carrier positions：Determined using projection matrix and pilot frequency sequence；The long of training field in the data cell is trained Value of the value of sub-carrier positions as the pilot subcarrier positions of OFDM symbol in each OFDM symbol block is corresponded in sequence.

It should be noted that determine can be to be generated using individual layer traditional pilot sequence using projection matrix and pilot frequency sequence Orthogonal multilayer pilot frequency sequence, but it is not limited to this.

Such as, it is assumed that website has two empty time streams, for 26toneRU, pilot frequency sequence p_26tone{ 6,20 }= [1,1], projection matrix areDisplacement pilot interval is 1, and displacement pilot tone cycle period is 26 OFDM symbols, with Exemplified by the value of the pilot subcarrier positions of two empty time streams of the first two symbol, then pass through the element in pilot frequency sequence and projection Matrix multiple obtains, and can obtain the values of the pilot subcarrier positions of first OFDM symbol, first empty time stream, first The value of the pilot subcarrier positions of second empty time stream stream of OFDM symbol, the pilot tone of second OFDM symbol, first empty time stream stream The value of sub-carrier positions, the value of the pilot subcarrier positions of second OFDM symbol, second empty time stream stream, than such as above-mentioned pilot tone First value 1 in sequence is multiplied an obtained matrix with above-mentioned projection matrix, and the value in the matrix corresponds to first respectively The value of OFDM symbol the 6th pilot sub-carrier of first empty time stream, first OFDM symbol the 6th pilot tone of second empty time stream The value of carrier wave, the value of the 6th pilot sub-carrier of second OFDM symbol, first empty time stream, second OFDM symbol second The value of 6th pilot sub-carrier of empty time stream.

It should be noted that the above method can be used under the scene of multi-user's single current, multi-user's multithread can be used for Scene, but be not limited to this.When for multi-user's single current scene, the space-time flow data of above-mentioned each resource unit is identical, All it is 1, when for multi-user's multithread scene, the space-time flow amount of above-mentioned each resource unit is different.Need to illustrate , displacement pilot tone cycle period is relevant with the number of empty time stream, and space-time flow data is bigger, and displacement pilot tone cycle period is got over Greatly.

Alternatively, above-mentioned data cell can be protocol Data Unit, but be not limited to this, the executive agent of above-mentioned steps It can be access website, but be not limited to this.

A kind of sending method for running on above-mentioned network architecture data cell is provided in the present embodiment, and Fig. 5 is basis The flow chart of the processing method of the data cell of the embodiment of the present invention, as shown in figure 5, the flow comprises the following steps：

Step S502, the data cell that the first website is sent is received, wherein, the data field in data cell includes one Or multiple orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one or more OFDM in each OFDM symbol block Symbol；Leading part in the data cell includes：For indicating in the data field in each OFDM symbol block OFDM symbol displacement pilot frequency information；

Step S504, the channel information of resource unit corresponding with the second website is updated according to displacement pilot frequency information.

, can be due to being provided with the displacement for being used for updating resource unit channel information in data cell by above-mentioned steps Pilot frequency information, and then when receiving the data cell, letter can be updated by the displacement pilot frequency information in the data cell Road information, and then solve in correlation technique in the case of OFDMA or MU-MIMO, believed caused by environment Doppler frequency shift Road changes the problem of causing website can not update channel information in same data cell.

In one embodiment of the invention, above-mentioned displacement pilot frequency information includes at least one of：Displacement pilot interval, Wherein, the displacement pilot interval is used to indicate adjacent orthogonal frequency division multiplex OFDM symbol pair in the data field in data cell The interval for the pilot sub-carrier answered；Displacement pilot tone cycle period, wherein, the displacement pilot tone cycle period is used to indicate data word Pilot sub-carrier in section has traveled through the number for the OFDM symbol that all data subcarriers are passed through；For indicating to participate in using The displacement pilot tone tupe of the website of family transmission.

It should be noted that the interval of pilot sub-carrier corresponding to above-mentioned adjacent OFDM symbol can be led according to above-mentioned displacement Frequency is set to one or more subcarrier, but is not limited to this.

It should be noted that as shown in figure 3, the displacement pilot tone configured information of resource block corresponding to multiple users is using identical Bit indicated, as shown in figure 4, each resource block can show as each money using independent displacement pilot tone processing mode The pilot sub-carrier of source block carries out independent instruction.

In one embodiment of the invention, data cell can be sent to by multiple stations by least one of method Point：Single current orthogonal frequency-time multiple access OFDMA modes, multithread OFDMA modes, multiple-input and multiple-output MIMO method.I.e. in fact, The above method can apply to OFDMA or MU-MIMO situation.

Alternatively, above-mentioned data cell can be protocol Data Unit, but be not limited to this, the executive agent of above-mentioned steps It can be website, but be not limited to this.

In one embodiment of the invention, above-mentioned steps S304 can show as being obtained according to the displacement pilot frequency information The position of the pilot sub-carrier of OFDM symbol in the data cell in data field；Led according in the position Frequency subcarrier updates the channel information.At least one of form can be specifically shown as, but is not limited to this：(1) pass through Training data in the data cell in lead code obtains the initial channel estimation of resource unit corresponding to second website； First OFDM symbol in the data cell in data field is parsed using the initial channel estimation；With described first OFDM symbol performs following processing procedure, until having updated the initial letter as the starting point for updating the initial channel information Untill road is estimated：Using the pilot sub-carrier estimating channel information of the n-th OFDM symbol in the data field, first is obtained Channel information；By obtained first channel information replace in the initial channel estimation with the n-th OFDM symbol pair The channel information answered, the initial channel estimation after being updated；Wherein, the initial channel estimation after the renewal is used to parse institute State the N+1 OFDM symbol in data field；Wherein, 1<N<T, N are integer, and T is the displacement pilot tone cycle period.(2) The initial channel of resource unit corresponding to second website is obtained by the training data in lead code in the data cell Estimation；The 1st to M OFDM symbol of the data field in the data cell is demodulated using the initial channel estimation；With institute It is unit to state M OFDM symbol in data field, using the 1st to M OFDM symbol of the data field as starting point, perform with Lower processing procedure, untill the initial channel estimation has been updated：Estimated respectively using the pilot sub-carrier of M OFDM symbol Channel information, obtain M channel information；By the M channel information replace in the initial channel estimation with the M OFDM Channel information corresponding to symbol, the initial channel estimation after being updated；Wherein, the initial channel estimation after the renewal is used for Demodulate M OFDM symbol after the M OFDM symbol in the data field；Wherein, 1 ＜ M ＜ T, M is integer, and T is institute Rheme moves pilot tone cycle period.

The channel for estimating to obtain using the pilot sub-carrier in first OFDM symbol is laid particular emphasis on for (1) kind form to believe The new initial channel estimation that substituted for obtaining after corresponding channel information in initial channel estimation is ceased to accord with to demodulate the 2nd OFDM Number, the channel information that the pilot sub-carrier in second OFDM symbol is estimated to obtain substituted for corresponding letter in initial channel estimation The new initial channel estimation obtained after road information demodulates the 3rd OFDM symbol, the like finish until renewal.For (2) kind form is laid particular emphasis on demodulates a part of OFDM symbol (such as the 1st to the 12nd ODFM symbol) with initial channel estimation, When demodulating this part of OFDM symbol, the pilot sub-carrier estimation of each OFDM symbol in this part of OFDM symbol is preserved Obtained channel estimation (such as 12 channel estimation values), after this part of OFDM symbol has been demodulated, by these channel estimations Initial channel estimation is replaced, the initial channel estimation after being updated, goes to demodulate using the initial channel estimation after renewal another Portion's OFDM symbol (such as the 13rd to 24 OFDM symbol), until renewal finishes.No matter can be complete using which kind of form of expression Into the renewal of channel information.

For a better understanding of the present invention, the present invention is further explained below in conjunction with preferred embodiment.

In one embodiment, there is provided the adding method of communication system displacement pilot tone, in another embodiment, also provide The generation method of multiple resource block user data cell of the transmitting terminal generation with displacement pilot tone, is received in another embodiment The detection that end passes through cyclic shift pilot tone progress channel estimation and data cell by the data cell received.A kind of real Apply in mode, it is a kind of to be used to indicate method of the data cell pilot sub-carrier in data field symbols cyclic shift, including data The indicating mode of pilot sub-carrier cyclic shift in unit in lead code, and pilot sub-carrier are each in Data Units Section The displacement model of field.The indicating mode be describe single stream case under multiple resources it is fast on displacement model；The wherein data sheet Member contains targeting sequencing and data field, and data field contains multiple user resources blocks, and each resource block has independent bits Pilot sub-carrier is moved, the displacement mode of each user indicates to indicate using multiple independent fields in lead code.In another kind Each data cell contains the data of multiple users in embodiment, and displacement pilot sub-carrier is independently of the resource block of user, In the lead code of data cell, indicated with single field.

In another embodiment, it is a kind of to be used to indicate that multi-stream data unit pilot sub-carrier follows in data field symbols The mode of ring displacement and the multi-stream data unit generation method with cyclic shift pilot tone.Contained in another embodiment Under multi-stream case, displacement pilot generation mode is independently indicated in data cell in lead code, it is each in data field in data cell Individual user resources block multi-stream data field independently generates mode.In another embodiment, lead code is unified in data cell Indicate multiple user resources block numbers according to the pilot tone cyclic shift pattern in generation, the data field multi-user resource block of data cell Unified generation pilot tone cyclic shift.

Such scheme provides communication system in doppler environments, and the multi-user data unit that transmitting terminal is sent is not increasing In the case of adding overhead, channel estimation is carried out by the displacement pilot sub-carrier between multi-user, applied to data sheet The different piece of member, the bit error rate of physical layer is reduced, improve the communication quality of physical layer.

The embodiment of the present invention additionally provides one kind and is preferably used in the pilot tone in multi-user ofdma single data stream communication system The instruction of displacement and the method for pilot tone displacement, this method include：Pilot sub-carrier designator is set and pilot sub-carrier is set Displacement, generate data cell.Designator contains multi-user's common information in data cell lead code, and the multi-user is common Information indicates the pilot tone displacement model for participating in multi-user transmission website, or configured information in data cell lead code includes Each user profile, each user profile, which indicates, to be participated in the pilot tone displacement of multi-user transmission website and sets.Described is multi-purpose Family common information contains the displacement interval of pilot sub-carrier, the displacement cycle cycle of pilot sub-carrier, Doppler's indicating bit.Institute The each user profile stated contains the displacement interval of pilot sub-carrier, and in the displacement cycle cycle of pilot sub-carrier, Doppler refers to Show position.Described user each possesses RU resource blocks, and each RU contains one or more pilot sub-carriers.The data cell In data field in adjacent OFDM symbol pilot sub-carrier interval be according to data cell indicate pilot tone displacement interval set It is set to and is separated by one or more subcarriers.The data cell of the generation is protocol Data Unit.

The embodiment of the present invention additionally provides one kind and is preferably used in generation OFDMA MU-MIMO data cell methods, we Method includes generation and includes transmission multi-stream data unit to multiple users, and the displacement configured information of the pilot sub-carrier of multi-user is raw Into the pilot subcarrier values of multithread.Described pilot tone displacement configured information contains the displacement of neighboring data symbols pilot sub-carrier Interval, the cycle period of displacement pilot tone, space-time flow amount, Doppler's indicating bit.Pass through pilot tone motif column-generation multithread pilot bit Shifting value.The RU resource blocks that described user each possesses, each RU contain pilot sub-carrier；Data in the data cell The interval of adjacent OFDM symbol pilot sub-carrier is that the pilot tone displacement indicated according to data cell is set to be separated by field One or more subcarriers.Above-mentioned data cell can be with protocol Data Unit.

Illustrated below in conjunction with several specific preferred embodiments：

These preferred embodiments are to be directed in the communication system based on 802.11 serial protocols WLAN to use, and are mainly concerned with When physical layer generates the data cell of multi-user, the setting rule and method of pilot sub-carrier, and the handling process of receiving terminal. As shown in figure 1, AP sends data to multiple site STAs simultaneously, can be complicated outdoor environment in the environment, AP is according to website Channel information and Packet Error Ratio of feedback etc. determine the parameter information of the needs of displacement pilot tone, generation using with displacement pilot tone User data unit, different websites is sent to by MU-MIMO or OFDMA modes.

Preferred embodiment 1

In the preferred embodiment, due to having automobile between AP and website by the way that its communication channel is changed, but not It is limited to the caused environment Doppler channel variation of this mode, AP sends data cell to multiple stations by OFDMA single current modes Point STA, each website take different RU, and each RU includes different number of orthogonal sub-carriers, and different websites pass through OFDMA side The RU distribution of formula is as shown in fig. 6, the signal that the resource block that Fig. 6 is the complete bandwidth provided according to the preferred embodiment of the present invention distributes Figure.

AP passes through signaling field (eg in the lead code of data cell in data cell:HE-SIG-B RU distribution) is indicated, Each RU space-time fluxion, Doppler's bit (position is used to refer to whether website uses displacement pilot tone), displacement pilot interval, The information such as displacement pilot tone tupe.Each RU granularity is different, when each RU data subcarrier and pilot sub-carrier When ratio is identical, each RU of AP websites uses unified displacement pilot tone tupe, when each RU data subcarrier domain pilot tone During subcarrier ratio difference, AP websites use independent displacement pilot tone tupe to each RU.

When AP websites send downlink data unit under single current OFDMA patterns to multiple websites, when each RU data When subcarrier is identical with pilot sub-carrier ratio, for example 26tone RU in 11ax, data subcarrier and pilot sub-carrier ratio are 24/2=12,52toneRU data subcarrier and pilot sub-carrier ratio 48/4=12, AP by lead code on displacement The information instruction of pilot tone uses unified processing mode, and each RU follows displacement interval k, displacement frequency pilot sign cycle period T Etc. configured information, displacement pilot interval k illustrates the interval of pilot tone displacement in two adjacent OFDM symbols；Displacement frequency pilot sign Cycle period T illustrates pilot sub-carrier can travel through all data subcarriers, each RU number by T OFDM symbol According to subcarrier it is identical with the ratio of pilot sub-carrier when, i.e., such as following formula：

Wherein N_SD,i N_SP,iI-th of RU data subcarrier number and pilot tone subcarrier number is represented, when displacement pilot tone When being set to k=1, displacement frequency pilot sign cycle period is the ratio D that T is equal to data subcarrier and pilot sub-carrier, works as k During more than 1, displacement frequency pilot sign cycle period T=D/k, it can be seen that when the symbol cycle period of the smaller needs of displacement interval is got over It is long.

AP carries out the setting of displacement pilot tone by above- mentioned information, and Fig. 7 is according to the complete of preferred embodiment of the present invention offer The displacement diagram of bandwidth i+1 symbol displacement pilot tone, as shown in fig. 7, the displacement in per adjacent OFDM data symbol is led For frequency at intervals of k, the threshold value for the channel SNR that k value returns according to site STA determines that often T OFDM symbol can circulate one time Data subcarrier.

Receiving terminal STA receives the data of full bandwidth, parses the RU distribution of the website in lead code signaling moiety, and displacement is led Frequency interval k, displacement pilot tone cycle period T, initial channel estimation H, long training sequence are obtained by the long training sequence in lead code Arrange (eg:LTF) the one group of sequence pre-defined in the lead code of data cell, for estimating that the channel of each subcarrier is believed Breath, can also expand to long training sequence in multiple empty time streams, the number of long training sequence is equal to when sending multiple empty time streams Space-time flow amount (when empty time stream is even number) or space-time flow amount add one (when empty time stream is odd number), in each solution OFDM numbers During according to symbol, estimate the channel information h of the pilot sub-carrier by the pilot sub-carrier reception data of the OFDM data symbol, lead to The renewal H of the channel information, successively iteration that correspond to pilot sub-carrier is crossed in h renewal channel estimations H, can by T OFDM symbol To update complete channel information H on this website RU completely, the H after renewal is used to parse follow-up OFDM data symbol.

Preferred embodiment 2

In the preferred embodiment, AP leads to single current OFDMA modes to multiuser transmission data cell, each RU pilot patterns When sample difference, i.e. data subcarrier and pilot sub-carrier ratio difference, such as following formula：

Each RU displacement frequency pilot sign cycle period T_iIt is different, AP is in the signaling domain of the leading part of data cell (eg:HE-SIG-B the RU distribution of each user) is indicated respectively, displacement pilot tone is intercycle k_i, the symbol traversal of displacement pilot tone Cycle T_i, Doppler's bit etc., such as 52tone RU pilot tone is 4 in 11ax, 106tone RU pilot tone is also 4, Data subcarrier is different with the ratio of pilot sub-carrier, and the OFDM symbol number that different RU ergodic datas subcarriers need is also different , AP signaling fields in data cell lead code independently indicate unique configured information that each user needs.

AP when data cell is generated to carrying out displacement in different symbols, only inside this RU enter by displacement pilot tone OK, Fig. 8 is according to the schematic diagram of the displacement pilot distribution of any two RU independences of preferred embodiment of the present invention offer, such as Fig. 8 Shown, in different two different RU of displacement in adjacent OFDM symbol data, displacement pilot interval is also different, and displacement is led The interval k of frequency_iThe channel SNR and Packet Error Ratio that value is fed back according to site STA are configured, and different OFDM makes on single current With pilot tone basic sequence, pilot tone basic sequence is the pilot frequency sequence in pre-defined OFDM symbol, such as the 20MHz in 11ac agreements In bandwidth, pilot tone motif is classified as P_20MHz{ -21, -7,7, -21 }=[1,1,1, -1] is set at subcarrier -21, -7,7,21 places Value be 1,1,1, -1.

When some site STA receives data cell, signaling field is parsed, obtains the RU distributions of this website, displacement is led Frequency symbol travels through the cycle, and displacement pilot interval, Doppler's bit, when the website is provided with Doppler's bit, website leads to The long training sequence crossed in lead code obtains website RU channel estimation H, same using channel estimation solution OFDM data symbol When, using the channel information h of the new pilot sub-carrier of the pilot tone acquisition in OFDM symbol, such as, first OFDM symbol uses The H that long training sequence obtains is parsed, and pilot tone estimating channel information h, the corresponding sons of renewal H are obtained by first OFDM symbol The channel information of carrier wave, the H after renewal, for parsing the second OFDM symbol, led by displacement in second OFDM data symbol Frequency obtain channel h renewal H, the like processing, all H have been updated by T data OFDM can.Different site STAs Corresponding RU channel information is updated by this method.

Preferred embodiment 3

In the preferred embodiment, in WLAN communication systems, as AP by MIMO and OFDMA modes to multiple websites Being communicated, different site STAs, using different RU, each site STA has multiple empty time streams, in this case, by In different, the processing of the displacement pilot tone independence of each website using space-time flow amount of each website.

First, signaling field (eg in lead code of the AP websites in data cell:HE-SIG-B different site STAs) are indicated RU distribution, empty time stream number N_STS, the interval k of displacement pilot tone, displacement pilot tone cycle period T, the information such as Doppler's bit. When with multiple space-time flow amounts, displacement pilot tone cycle period T is different from single stream case：

Wherein i represents i-th of website, needs to produce the data of the displacement pilot sub-carrier of multithread in this case, such as In 11ax in 26tone RU, when with two empty time streams, if to obtain the channel information of some subcarrier, it is necessary to two The reception data of the subcarrier on individual symbol, data corresponding to the displacement pilot tone of different empty time streams are orthogonal, more empty time streams Displacement pilot tone generating mode：Assuming that STA has two empty time streams, for 26tone RU, pilot tone motif is classified as p_26tone { 6,20 }=[1,1], displacement pilot interval are k=1, and displacement pilot tone cycle period T is 26 OFDM symbols, passes through P matrixes pair The data of each subcarrier carry out orthogonal mapping, and P matrixes are：

Pilot sub-carrier data on two streams of the first two symbol are obtained by p*P, and p is the element of pilot tone basic sequence, Four pilot values that p*P is obtained in this example, are first symbol, first empty time stream respectively, first symbol, second space-time Stream, second symbol, first empty time stream, second symbol, second empty time stream, is given birth to by pilot tone basic sequence according to the method Into the pilot data of more empty time streams, per N_STSIndividual OFDM symbol, the position displacement k of pilot sub-carrier, pass through T OFDM symbol The displacement cycle complete successively of displacement pilot tone, such as Fig. 9 are that the more empty time stream displacements provided according to the preferred embodiment of the present invention are led The schematic diagram of frequency, in the 26tone RU in Fig. 9 examples, initial pilot position is 6 and 20 subcarriers, and two streams of generation are led Frequency is worth, and every setting k=1 in two OFDM symbol displacement pilot tones, 1 subcarrier spacing, this example, passes through 26 OFDM symbols time Going through complete has the 26toneRU of two stream.

In the case of AP sends descending more empty time streams, receiving terminal site STA receives data cell, parses long training sequence Row, obtain website RU initial channel estimation H, the channel estimation are applied into the preceding N in the data field of the RU_STSIndividual OFDM On symbol, corresponding RU data are solved, pass through preceding N_STSIndividual OFDM symbol obtains the channel information h of displacement pilot tone, corresponding to renewal The channel information of corresponding sub-carrier indices in initial channel estimation H, it is complete by T OFDM data symbol iterative channel information It is complete to update one time.

Preferred embodiment 4

Wherein i represents i-th of website, needs to produce the number of the corresponding subcarrier of displacement pilot tone generation of multithread in this case According to, such as in 11ax in 26tone RU, when with two empty time streams, data corresponding to the displacement pilot tone of different empty time streams are Orthogonal, the displacement pilot tone generating mode of more empty time streams：The value of upper long training sequence in targeting sequencing is directly used as pilot tone The data of subcarrier, this mode have been multiplexed long training data, and long instruction training sequence number it is equal with space-time flow amount or Person adds one equal to space-time flow data, can so reduce the complexity of transmitting terminal, for example, for 26toneRU, pilot tone rope Draw the data on the 6th and the 20th subcarrier using the data corresponding to long training sequence on subcarrier.

According to the method described above, the displacement pilot tone letter on each RU can be generated in the case of descending more empty time streams with AP Breath.

Preferred embodiment 5

In the preferred embodiment, multiple users send data cell to AP simultaneously, and it is different that AP sends Trigger frame schedulings User's sends data by upgoing O FDMA modes, and AP is indicated each user in Trigger frames and led using different displacements Frequency is indicated that each user receives Trigger frames and obtains the information of this website, such as the RU distribution of this website, displacement are led Frequency information, data flow distribution etc., the generation of data cell is carried out by these information stations, when generating data cell, each Website is simply carried out data transmission using this RU, and each website uses this website displacement pilot frequency information indicated in Trigger frames： STA RU distribution, empty time stream number N_STS, the interval k of displacement pilot tone, displacement pilot tone cycle period T, Doppler's bit, generation The up data cell with displacement pilot tone.

Through the above description of the embodiments, those skilled in the art can be understood that according to above-mentioned implementation The method of example can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but a lot In the case of the former be more preferably embodiment.Based on such understanding, technical scheme is substantially in other words to existing The part that technology contributes can be embodied in the form of software product, and the computer software product is stored in a storage In medium (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, calculate Machine, server, or network equipment etc.) perform method described in each embodiment of the present invention.

Embodiment 2

Additionally provide a kind of dispensing device of data cell in the present embodiment, the device be used to realizing above-described embodiment and Preferred embodiment, repeating no more for explanation was carried out.As used below, term " module " can realize predetermined work( The combination of the software and/or hardware of energy.Although device described by following examples is preferably realized with software, firmly Part, or the realization of the combination of software and hardware is also what may and be contemplated.

Figure 10 is the structured flowchart of the dispensing device of data cell according to embodiments of the present invention, as shown in Figure 10, the dress Put including：

Generation module 1002, for generating data cell, wherein, the data field in data cell is including one or more Individual orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one or more OFDM symbol in each OFDM symbol block；Institute The leading part stated in data cell includes：For indicating the OFDM symbols in the data field in each OFDM symbol block Number displacement pilot frequency information；

Sending module 1004, it is connected with above-mentioned generation module 1002, for sending the data cell.

By said apparatus, due to being provided with the displacement pilot tone for being used for updating resource unit channel information in data cell Information, the data cell is sent to website, and then caused when doppler environments frequency displacement causes channel variation, website being capable of profit Channel information is updated with the displacement pilot frequency information, is solved in correlation technique in the case of OFDMA or MU-MIMO, due to environment The problem of channel variation caused by Doppler frequency shift causes website can not update channel information in same data cell.

It should be noted that said apparatus can apply to uplink multi-users transmission, descending multi-user can also be applied to Transmission, but it is not limited to this.

It should be noted that above-mentioned generation module 1002 can be with individualism, can also be with the above-mentioned knot of sending module 1004 Close, however it is not limited to this.Above-mentioned generation module 1002 can apply to descending multi-purpose with the device that above-mentioned sending module 1004 is combined Transmit at family.

In one embodiment of the invention, when being transmitted applied to uplink multi-users, said apparatus also includes：Receive mould Block, for receiving the trigger frame of access website transmission, wherein, the trigger frame includes each station being used in the multiple website Point generates the configured information of the data cell；Wherein, the configured information includes the displacement pilot frequency information；Above-mentioned generation mould Block 1002 is additionally operable to generate the data cell according to the configured information.

It should be noted that displacement pilot tone tupe includes, resource unit corresponding to each website in multiple websites Using unified displacement pilot tone processing mode, or resource unit corresponding to each website in multiple websites uses independent position Move pilot tone processing mode.The number of the sub- carrier frequency of data of resource unit corresponding to each website in multiple websites and pilot tone When the ratio between number of carrier wave is identical, displacement pilot frequency mode is resource unit corresponding to each website in multiple websites using unified Displacement pilot tone processing mode；The number of the sub- carrier frequency of data of resource unit corresponding to each website in multiple websites is with leading When the ratio between number of frequency subcarrier differs, displacement pilot frequency mode is adopted for each resource unit corresponding to the website in multiple websites With independent displacement pilot tone processing mode.

It should be noted that as shown in figure 3, the displacement pilot tone configured information of resource block corresponding to multiple users is using identical Bit indicated, as shown in figure 4, each resource block can show as each money using independent displacement pilot tone processing mode The displacement pilot tone of source block carries out independent instruction.

In one embodiment of the invention, in one embodiment of the invention, in each OFDM symbol block The number of OFDM symbol is equal to the number of empty time stream indicated in the signaling field in the leading part, in same OFDM Sub-carrier indices where the pilot frequency locations of OFDM symbol in symbolic blocks are identicals.

In one embodiment of the invention, said apparatus can also include determining module, for by it is following at least it One mode determines the pilot frequency locations of OFDM symbol in each OFDM symbol block：Determined using projection matrix and pilot frequency sequence；By institute The value for corresponding to sub-carrier positions in data cell in the long training sequence of training field is stated as OFDM in each OFDM symbol block The value of the pilot frequency locations of symbol.

In one embodiment of the invention, above-mentioned sending module 1004 can send number by least one of method According to unit：Single current orthogonal frequency-time multiple access OFDMA modes, multithread OFDMA modes, multiple-input and multiple-output MIMO method.Or Said apparatus can also include receiving module, for receiving data cell by least one of mode：Single current orthogonal frequency Multiple access access OFDMA modes, multithread OFDMA modes, multiple-input and multiple-output MIMO method.

Alternatively, above-mentioned data cell can be protocol Data Unit, but be not limited to this, and above-mentioned dispensing device can position In access website, but it is not limited to this.

Figure 11 is the structured flowchart of the reception device of data cell according to embodiments of the present invention, as shown in figure 11, the dress Put including：

Receiving module 1102, the data cell sent for receiving the first website, wherein, the data in the data cell Field includes one or more orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one in each OFDM symbol block Or multiple OFDM symbols；Leading part in the data cell includes：It is each described in the data field for indicating The displacement pilot frequency information of OFDM symbol in OFDM symbol block；

Update module 1104, it is connected with above-mentioned receiving module 1102, for according to the renewal of displacement pilot frequency information and second station The channel information of resource unit corresponding to point.

By said apparatus, due to being provided with the displacement pilot tone for being used for updating resource unit channel information in data cell Information, after data cell is received so that when doppler environments frequency displacement causes channel variation, website can utilize the displacement Pilot frequency information updates channel information, solves in correlation technique in the case of OFDMA or MU-MIMO, due to environment Doppler frequency The problem of channel variation caused by shifting causes website can not update channel information in same data cell.

It should be noted that above-mentioned displacement pilot frequency information includes at least one of：Displacement pilot interval, wherein, it is described Displacement pilot interval is used to indicate pilot tone corresponding to adjacent orthogonal frequency division multiplex OFDM symbol in the data field in data cell The interval of subcarrier；Displacement pilot tone cycle period, wherein, the displacement pilot tone cycle period is used for leading in indicator data field Frequency subcarrier has traveled through the number for the OFDM symbol that all data subcarriers are passed through；For indicating to participate in multi-user transmission The displacement pilot tone tupe of website.

It should be noted that above-mentioned displacement pilot tone tupe includes, resource corresponding to each website in multiple websites Unit uses unified displacement pilot tone processing mode, or resource unit corresponding to each website in multiple websites is using independent Displacement pilot tone processing mode.The number of the sub- carrier frequency of data of resource unit corresponding to each website in multiple websites is with leading When the ratio between the number of frequency subcarrier is identical, displacement pilot frequency mode uses for resource unit corresponding to each website in multiple websites Unified displacement pilot tone processing mode；The number of the sub- carrier frequency of data of resource unit corresponding to each website in multiple websites When being differed with the ratio between the number of pilot sub-carrier, displacement pilot frequency mode is resource list corresponding to each website in multiple websites Member uses independent displacement pilot tone processing mode.

In one embodiment of the invention, when the above method is under multi-user's multithread scene, pilot tone can be passed through Basic sequence determines each pilot tone shift value corresponding to empty time stream under multiple empty time streams.Such as, it is assumed that website has two space-times Stream, for 26toneRU, pilot tone motif is classified as p_26tone{ 6,20 }=[1,1], displacement pilot interval are 1, and displacement pilot tone is followed The ring cycle is 26 OFDM symbols, by taking the pilot tone shift value of two empty time streams of the first two symbol as an example, then pass through pilot tone base Sequence can obtain 4 pilot tone shift values, the pilot tone shift value of first empty time stream of respectively first symbol, first symbol The pilot tone shift value of second empty time stream, the pilot tone shift value of second symbol, first empty time stream, second symbol second The pilot tone shift value of empty time stream.

In one embodiment of the invention, above-mentioned update module 1104 is additionally operable to be obtained according to the displacement pilot frequency information The position of the pilot sub-carrier of OFDM symbol in the data cell in data field；And according to the institute in the position State pilot sub-carrier and update the channel information.

Preferably, above-mentioned update module 1104 is additionally operable to obtain by the training data in lead code in the data cell The initial channel estimation of resource unit corresponding to second website；The data cell is parsed using the initial channel estimation First OFDM symbol in middle data field；For updating the initial channel information is used as using first OFDM symbol Point, following processing procedure is performed, untill having updated the initial channel estimation：Utilize the n-th in the data field The pilot sub-carrier estimating channel information of OFDM symbol, obtains the first channel information；Obtained first channel information is replaced Channel information corresponding with the n-th OFDM symbol, the initial channel after being updated in the initial channel estimation is changed to estimate Meter；Wherein, the initial channel estimation after the renewal is used to parse the N+1 OFDM symbol in the data field；Wherein, 1 ＜ M ＜ T, N is integer, and T is the displacement pilot tone cycle period.I.e. above-mentioned more row module 1104 utilizes first OFDM symbol In the pilot tone channel information estimating to obtain substituted for obtaining after corresponding channel information in initial channel estimation it is new initial Channel estimation demodulates the second OFDM symbol, and the channel information that the pilot sub-carrier in second OFDM symbol is estimated to obtain replaces The new initial channel estimation that is obtained in initial channel estimation after corresponding channel information demodulates the 3rd OFDM symbol, according to It is secondary to analogize until renewal finishes.

Preferably, above-mentioned update module 1104 is additionally operable to obtain by the training data in lead code in the data cell The initial channel estimation of resource unit corresponding to second website；The data cell is demodulated using the initial channel estimation In data field the 1st to M OFDM symbol；In units of M OFDM symbol in the data field, with the data 1st to M OFDM symbol of field is starting point, performs following processing procedure, untill the initial channel estimation has been updated： Distinguish estimating channel information using the pilot sub-carrier of M OFDM symbol, obtain M channel information；By the M channel information Channel information corresponding with the M OFDM symbol, the initial channel after being updated in the initial channel estimation is replaced to estimate Meter；Wherein, the initial channel estimation after the renewal is used to demodulate the M after the M OFDM symbol in the data field Individual OFDM symbol；Wherein, 1 ＜ M ＜ T, M is integer, and T is the displacement pilot tone cycle period.I.e. above-mentioned update module 1104 with Initial channel estimation demodulates a part of OFDM symbol (such as the 1st to the 12nd ODFM symbol), is demodulating this part of OFDM symbol Number when, preserve channel estimation that the pilot tone of each OFDM symbol in this part of OFDM symbol estimates to obtain (such as 12 Channel estimation value), after this part of OFDM symbol has been demodulated, these channel estimations are replaced into initial channel estimation, obtained more Initial channel estimation after new, go to demodulate another OFDM symbol the (such as the 13rd to 24 using the initial channel estimation after renewal Individual OFDM symbol), until renewal finishes.

In one embodiment of the invention, above-mentioned receiving module 1102 can be received by least one of method State data cell：Single current orthogonal frequency-time multiple access OFDMA modes, multithread OFDMA modes, multiple-input and multiple-output MIMO method. I.e. in fact, the above method can apply to OFDMA or MU-MIMO situation.

Alternatively, above-mentioned data cell can be protocol Data Unit, but be not limited to this, and above-mentioned dispensing device can position In website, but it is not limited to this.

It should be noted that above-mentioned modules can be realized by software or hardware, for the latter, Ke Yitong Cross in the following manner realization, but not limited to this：Above-mentioned module is respectively positioned in same processor；Or above-mentioned modules are with any The form of combination is located in different processors respectively.

Embodiment 3

A kind of website, including the dispensing device described in Figure 10 are additionally provided in the present embodiment.

Another website, including the processing unit described in Figure 11 are additionally provided in the present embodiment.

It should be noted that the relevant explanation for dispensing device and processing unit may be referred to the description of embodiment 2, this Place repeats no more.

Embodiment 4

Embodiments of the invention additionally provide a kind of storage medium.Alternatively, in the present embodiment, above-mentioned storage medium can To be arranged to the program code for the step of storage is used to perform the method in embodiment 1.

Alternatively, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. is various can be with the medium of store program codes.

Alternatively, the specific example in the present embodiment may be referred to described in above-described embodiment and optional embodiment Example, the present embodiment will not be repeated here.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims

A kind of 1. sending method of data cell, it is characterised in that including：

Data cell is generated, wherein, the data field in the data cell includes one or more OFDM OFDM symbol block, wherein, include one or more OFDM symbol in each OFDM symbol block；In the data cell Leading part includes：For indicating that the displacement pilot tone of the OFDM symbol in the data field in each OFDM symbol block is believed Breath；

Send the data cell.
2. according to the method for claim 1, it is characterised in that before data cell is generated, methods described also includes：Connect The trigger frame that access website is sent is received, wherein, the trigger frame includes each website being used in multiple websites and generates the number According to the configured information of unit；Wherein, the configured information includes the displacement pilot frequency information；

Generation data cell includes：The data cell is generated according to the configured information.
3. method according to claim 1 or 2, it is characterised in that the displacement pilot frequency information includes at least one of： Displacement pilot interval, wherein, the displacement pilot interval is used to indicate adjacent orthogonal frequency division multiplex OFDM in the data field The interval of pilot sub-carrier corresponding to symbol；Displacement pilot tone cycle period, wherein, the displacement pilot tone cycle period is used to indicate Pilot sub-carrier in the data field has traveled through the number for the OFDM symbol that all data subcarriers are passed through；For referring to Show the displacement pilot tone tupe for the website for participating in multi-user transmission.
4. method according to claim 1 or 2, it is characterised in that the data are sent by least one of mode Unit：Single current orthogonal frequency-time multiple access OFDMA multiuser modes, multithread OFDMA multiuser modes, multiple-input and multiple-output MIMO Mode.
5. according to the method for claim 3, it is characterised in that the displacement pilot tone tupe includes, in multiple websites Each website corresponding to resource unit use unified displacement pilot tone processing mode, or each website pair in multiple websites The resource unit answered uses independent displacement pilot tone processing mode.
6. according to the method for claim 5, it is characterised in that resource corresponding to each website in the multiple website When the number of the sub- carrier frequency of data in unit is identical with the ratio between the number of pilot sub-carrier, the displacement pilot frequency mode is described more Resource unit corresponding to each website in individual website uses unified displacement pilot tone processing mode；In the multiple website When the ratio between the number of the sub- carrier frequency of data of resource unit and the number of pilot sub-carrier differ corresponding to each website, institute's rheme Move pilot frequency mode and use independent displacement pilot tone processing mode for resource unit corresponding to each website in the multiple website.
7. according to the method for claim 1, it is characterised in that the number of the OFDM symbol in each OFDM symbol block Equal to the number of empty time stream indicated in the signaling field in the leading part, the OFDM in same OFDM symbol block Sub-carrier indices where the pilot subcarrier positions of symbol are identicals.
8. the method according to claim 1 or 7, OFDM in each OFDM symbol block is determined by least one of mode The value of the pilot subcarrier positions of symbol：

Determined using projection matrix and pilot frequency sequence；

The value of pilot subcarrier positions will be corresponded in the long training sequence of training field in the data cell as each OFDM The value of the pilot subcarrier positions of OFDM symbol in symbolic blocks.
A kind of 9. processing method of data cell, it is characterised in that including：

The data cell of the first website transmission is received, wherein, the data field in the data cell includes one or more Orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one or more OFDM symbol in each OFDM symbol block；It is described Leading part in data cell includes：For indicating the OFDM symbol in the data field in each OFDM symbol block Displacement pilot frequency information；

The channel information of resource unit corresponding with the second website is updated according to the displacement pilot frequency information.
10. according to the method for claim 9, it is characterised in that the displacement pilot frequency information includes at least one of：Position Pilot interval is moved, wherein, the displacement pilot interval is used to indicate adjacent orthogonal frequency in the data field in the data cell Divide the interval of pilot sub-carrier corresponding to multiplexing OFDM symbol；Displacement pilot tone cycle period, wherein, the displacement pilot tone circulating cycle Phase is used to indicate that the pilot sub-carrier in the data field has traveled through the OFDM symbol that all data subcarriers are passed through Number；For the displacement pilot tone tupe for the website for indicating to participate in multi-user transmission.
11. according to the method for claim 10, it is characterised in that the displacement pilot tone tupe includes, multiple websites In each website corresponding to resource unit use unified displacement pilot tone processing mode, or each website in multiple websites Corresponding resource unit uses independent displacement pilot tone processing mode.
12. according to the method for claim 11, it is characterised in that money corresponding to each website in the multiple website When the number of the sub- carrier frequency of data of source unit is identical with the ratio between the number of pilot sub-carrier, the displacement pilot frequency mode is described more Resource unit corresponding to each website in individual website uses unified displacement pilot tone processing mode；In the multiple website When the ratio between the number of the sub- carrier frequency of data of resource unit and the number of pilot sub-carrier differ corresponding to each website, institute's rheme Pilot frequency mode is moved to handle using independent displacement pilot tone for each resource unit corresponding to each website in the multiple website Mode.
13. according to the method for claim 9, it is characterised in that the displacement pilot frequency information is carried in the leading part Signaling field in.
14. according to the method for claim 9, it is characterised in that according to displacement pilot frequency information renewal and the second website The channel information of corresponding resource unit includes：

The pilot sub-carrier of the OFDM symbol in the data cell in data field is obtained according to the displacement pilot frequency information Position；

The channel information is updated according to the pilot sub-carrier in the position.
15. according to the method for claim 14, it is characterised in that according to the pilot sub-carrier in the position more The new channel information includes：

The first of resource unit corresponding with second website is obtained by the training data in lead code in the data cell Beginning channel estimation；

First OFDM symbol in the data cell in data field is parsed using the initial channel estimation；

Using first OFDM symbol as the starting point for updating the initial channel information, following processing procedure is performed, until Untill having updated the initial channel estimation：Estimated using the pilot sub-carrier of the n-th OFDM symbol in the data field Channel information, obtain the first channel information；By obtained first channel information replace in the initial channel estimation with institute Channel information corresponding to n-th OFDM symbol is stated, the initial channel estimation after being updated；Wherein, it is initial after the renewal Channel estimation is used to parse the N+1 OFDM symbol in the data field；

Wherein, 1<N<T, N are integer, and T is the displacement pilot tone cycle period.
16. according to the method for claim 14, it is characterised in that according to displacement pilot frequency information renewal and the second website The channel information of corresponding resource unit includes：

The initial of resource unit corresponding to second website is obtained by the training data in lead code in the data cell Channel estimation；

The 1st to M OFDM symbol of the data field in the data cell is demodulated using the initial channel estimation；

In units of M OFDM symbol in the data field, using the 1st to M OFDM symbol of the data field as rise Point, following processing procedure is performed, untill the initial channel estimation has been updated：

Distinguish estimating channel information using the pilot sub-carrier of M OFDM symbol, obtain M channel information；

The M channel information is replaced into channel information corresponding with the M OFDM symbol in the initial channel estimation, obtained Initial channel estimation after to renewal；Wherein, the initial channel estimation after the renewal is used to demodulate in the data field M OFDM symbol after the M OFDM symbol；

Wherein, 1 ＜ M ＜ T, M is integer, and T is the displacement pilot tone cycle period.
17. the method according to any one of claim 9 to 16, it is characterised in that connect by least one of method Receive the data cell：Single current orthogonal frequency-time multiple access OFDMA modes, multithread OFDMA modes, multiple-input and multiple-output MIMO side Formula.
A kind of 18. dispensing device of data cell, it is characterised in that including：

Generation module, for generating data cell, wherein, the data field in the data cell is including one or more just Frequency division multiplex OFDM symbolic blocks are handed over, wherein, include one or more OFDM symbol in each OFDM symbol block；The number Include according to the leading part in unit：For indicating the OFDM symbol in the data field in each OFDM symbol block Displacement pilot frequency information；

Sending module, for sending the data cell.
A kind of 19. processing unit of data cell, it is characterised in that including：

Receiving module, the data cell sent for receiving the first website, wherein, the data field in the data cell includes One or more orthogonal frequency division multiplex OFDM symbolic blocks, wherein, include one or more in each OFDM symbol block OFDM symbol；Leading part in the data cell includes：For indicating each OFDM symbol in the data field The displacement pilot frequency information of OFDM symbol in block；

Update module, for updating the channel information of resource unit corresponding with the second website according to the displacement pilot frequency information.
20. a kind of website, it is characterised in that including the dispensing device described in claim 18.
21. a kind of website, it is characterised in that including the processing unit described in claim 19.