CN101848175A - Methods and devices for pilot signal transmitting and pilot signal-based channel estimation - Google Patents
Methods and devices for pilot signal transmitting and pilot signal-based channel estimation Download PDFInfo
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Abstract
The embodiment of the invention discloses methods and devices for pilot signal transmission and pilot signal-based channel estimation. The pilot signal transmitting method comprises the following steps of: obtaining a carrier transmission pattern of a carrier resource in a discontinuous multicarrier system; and selecting part of subcarriers for setting a pilot signal from available subcarriers of the carrier resource according to the carrier transmission pattern and transmitting out the subcarriers set with a pilot signal in a multicarrier signal way. The method for channel estimation based on a pilot signal comprises the following steps of: obtaining the setting condition of the pilot signal by obtaining a pilot setting rule and the carrier transmission pattern of the carrier resource in the discontinuous multicarrier system; and receiving the transmitted multicarrier signal, obtaining the pilot signal from the multicarrier signal according to the setting condition of the pilot signal and carrying out channel estimation. The invention can conveniently realize the channel estimation on the discontinuous multicarrier system and improve accuracy of the channel estimation.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of pilot signal and send method, the device that reaches based on the channel estimating of pilot signal.
Background technology
In multi-carrier communications systems, pilot tone (Pilot) signal common is in realizing channel estimating.And the pilot signal of multicarrier system will design based on certain rule usually.With OFDM (OFDM, Orthogonal Frequency Division Multiplexing) multicarrier system is example, and pilot signal can adopt the Comb Pilot design rule to design.In ofdm system, suppose total N subcarrier in the frequency range, a pilot signal is set in every N_f subcarrier, utilizes this pilot signal can calculate its place subcarrier channel estimation, and then the entire spectrum resource that the user uses is carried out channel estimating.
In actual applications, particularly in the cognitive radio technology field, some subcarrier in one section frequency spectrum may be by the CU of other system, cause the operable subcarrier of cognitive system user discontinuous, in order effectively to improve the availability of frequency spectrum, a kind of discontinuous multi-transceiver technology is invented.Discontinuous multi-transceiver technology can make the active user use not by the discontinuous subcarrier of the CU of other system flexibly, and described other system is not formed interference, makes the availability of frequency spectrum of system improve.
Discontinuous multicarrier system is to take situation according to current frequency spectrum, determines the actual transmission subcarrier pattern that adopts.Channel estimation methods in traditional continuous multicarrier system is applied to having following shortcoming at least after the discontinuous multicarrier system: transmitting terminal still adopts traditional multicarrier system pilot design rule, and the parton carrier wave is unavailable, may cause the part pilot signal normally not send, thereby destroyed pilot interval, make channel estimation errors increase.Receiving terminal is estimated channel according to traditional multicarrier system pilot signal place subcarrier, causes not sending at transmitting terminal the subcarrier upper signal channel misjudgment of pilot tone.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of pilot signal to send method, the device that reaches based on the channel estimating of pilot signal, to be implemented in pilot signal transmitted in the discontinuous multicarrier system, be convenient to discontinuous multicarrier system is carried out channel estimating based on pilot signal.
According to one embodiment of the invention, a kind of pilot signal transmission method is provided, comprise the steps:
Obtain the carrier transmission pattern of carrier resource in the discontinuous multicarrier system;
According to described carrier transmission pattern, selection portion divides subcarrier that pilot signal is set in the available subcarrier of described carrier resource;
Subcarrier that pilot signal the is set form by multi-carrier signal is sent, and described pilot signal is used to offer receiving terminal so that discontinuous multicarrier system is carried out channel estimating.
According to still another embodiment of the invention, provide a kind of channel estimation methods, comprise the steps: based on pilot signal
Obtain the carrier transmission pattern that pilot tone is provided with carrier resource in rule and the discontinuous multicarrier system;
Rule is set and described carrier transmission pattern obtains pilot signal situation is set according to described pilot tone, described pilot signal is arranged in the parton carrier wave of available subcarrier in the carrier resource;
The multi-carrier signal that reception is sent is provided with situation according to described pilot signal, obtains described pilot signal from described multi-carrier signal;
Calculate the subcarrier channel estimation that obtains to be provided with pilot signal according to described pilot signal;
Utilize the described subcarrier channel estimation that pilot signal is set to estimate other subcarrier channel estimation.
According to still another embodiment of the invention, provide a kind of pilot signal dispensing device, comprising:
The transmission pattern acquisition module is used for obtaining the carrier transmission pattern of discontinuous multicarrier system carrier resource;
Pilot tone is provided with module, is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module, and according to described carrier transmission pattern, selection portion divides subcarrier that pilot signal is set in the available subcarrier of described carrier resource;
The pilot tone sending module is used to obtain the result that is provided with that pilot tone is provided with module, and subcarrier that pilot signal the is set form by multi-carrier signal is sent, and described pilot signal is used to offer receiving terminal so that discontinuous multicarrier system is carried out channel estimating.
According to still another embodiment of the invention, provide a kind of channel estimating apparatus, comprising based on pilot signal:
The regular pattern acquisition module is used for obtaining the carrier transmission pattern that pilot tone is provided with rule and discontinuous multicarrier system carrier resource;
The situation judge module is set, is used for rule being set and described carrier transmission pattern obtains pilot signal situation is set according to described pilot tone, described pilot signal is arranged in the parton carrier wave of available subcarrier in the carrier resource;
The pilot signal acquisition module is used to receive the multi-carrier signal that sends, and according to described pilot signal situation is set, and obtains described pilot signal from described multi-carrier signal;
First channel estimation module is used for calculating the subcarrier channel estimation that obtains to be provided with pilot signal according to described pilot signal;
The second channel estimation module is used to utilize the described subcarrier channel estimation that pilot signal is set to estimate other subcarrier channel estimation.
According to description to technique scheme, the embodiment of the invention has following advantage: by obtaining the carrier transmission pattern of carrier resource in the discontinuous multicarrier system, in carrier resource, select available subcarrier to send and receive pilot signal, and utilize described pilot signal that discontinuous multicarrier system is carried out channel estimating, improved the accuracy of discontinuous multicarrier system channel estimating.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic diagram of carrier wave frequency range operating position in a kind of discontinuous multicarrier system that provides of the embodiment of the invention one;
The schematic diagram of pilot signal transmission method in a kind of discontinuous multicarrier system that Fig. 2 provides for embodiments of the invention one;
Fig. 3 for the embodiment of the invention two provide a kind of in the available subcarrier of carrier resource selection portion divide subcarrier that the schematic diagram of pilot signal is set;
Fig. 4 is a kind of schematic diagram that utilizes the Comb Pilot design rule that pilot signal is set in the carrier resource sub-carriers of the embodiment of the invention two;
Fig. 5 is the schematic diagram of a kind of pilot signal set-up mode of the embodiment of the invention two;
Fig. 6 is the schematic diagram of another pilot signal set-up mode of the embodiment of the invention two;
Fig. 7 is the schematic diagram that a kind of subcarrier that has been provided with pilot signal of the embodiment of the invention two need not to reset pilot signal;
Fig. 8 is the schematic diagram of another pilot signal set-up mode of the embodiment of the invention two;
Fig. 9 divides subcarrier that the schematic diagram of pilot signal is set for another kind selection portion in the available subcarrier of carrier resource that the embodiment of the invention three provides;
The schematic diagram of a kind of channel estimation methods based on pilot signal that Figure 10 provides for embodiments of the invention four;
The structural representation of a kind of pilot signal dispensing device that Figure 11 provides for embodiments of the invention five;
The structural representation of a kind of channel estimating apparatus based on pilot signal that Figure 12 provides for embodiments of the invention six.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
It should be noted that following examples are the preferred embodiments of the present invention, these embodiment only are used to describe the present invention and are not used in qualification the present invention.
Embodiment one
In the carrier wave frequency range of discontinuous multicarrier system, band segment may be shared by the user of other system, and therefore the available frequency range of discontinuous multicarrier system user may be discontinuous.Fig. 1 is the schematic diagram of carrier wave frequency range operating position in a kind of discontinuous multicarrier system that provides of the embodiment of the invention one.Wherein, frequency range K1, K2 and K3 are unoccupied, are the operable frequency ranges of discontinuous multicarrier system user; All or part of frequency range is taken by other system among frequency range K4 and the K5, can not be used by discontinuous multicarrier system user.
The schematic diagram of pilot signal transmission method in a kind of discontinuous multicarrier system that Fig. 2 provides for embodiments of the invention one, this method comprises the steps:
S11: the carrier transmission pattern that obtains carrier resource in the discontinuous multicarrier system.
S12: according to described carrier transmission pattern, selection portion divides subcarrier that pilot signal is set in the available subcarrier of described carrier resource.
S13: the subcarrier that pilot signal will be set sends by the form of multi-carrier signal, and described pilot signal is used to offer receiving terminal so that discontinuous multicarrier system is carried out channel estimating.
Present embodiment selects available subcarrier to transmit pilot signal in carrier resource by obtaining the carrier transmission pattern of carrier resource in the discontinuous multicarrier system, utilizes described pilot signal that discontinuous multicarrier system is carried out channel estimating to make things convenient for receiving terminal.
In step S11, the carrier transmission pattern of described carrier resource shows the situation that can use subcarrier in the whole carrier resource.Transmitting terminal in the discontinuous multicarrier system can detect by self or with node joint-detection on every side, or the frequency spectrum that obtains carrier resource in the described system from connect database takies situation, and take situation and the system subcarrier bandwidth is determined the carrier transmission pattern according to described frequency spectrum, make and do not have discontinuous multicarrier system and with the other system in frequency range coexistence to interfere with each other; Described node also can obtain information such as carrier transmission pattern from other node.Described discontinuous multicarrier system can be cellular communications networks or netted (mesh) communication network.In cellular communications networks, the node that obtains the carrier transmission pattern can be base station or terminal.In actual applications, the information that the frequency spectrum of node takies situation can be kept in the database, so that node therefrom reads relevant information to determine the carrier transmission pattern; When node was not provided with such database or database and does not contain corresponding information, node also can carry out self detecting or carry out joint-detection to obtain the information that frequency spectrum takies situation with node around it.
In step S13, the transmitting terminal of multicarrier system can send subcarrier that pilot signal the is set form by multi-carrier signal, described multi-carrier signal can comprise a plurality of available subcarriers, wherein be provided with pilot signal in the parton carrier wave, other is not provided with in the subcarrier of pilot signal can be provided with data-signal, so that transmitting terminal sends described pilot signal when sending data.The receiving terminal of multicarrier system can receive described multi-carrier signal and therefrom obtain pilot signal, carries out channel estimating conveniently to utilize described pilot signal.With the ofdm system is example, and the ofdm system transmitting terminal can send the subcarrier that the is provided with pilot signal form by the OFDM symbol after the pilot signal setting is finished.Can comprise a plurality of subcarriers in the OFDM symbol, some of them are described subcarriers that are provided with pilot signal, and other subcarrier that is not provided with pilot signal can be provided with data-signal.The OFDM symbol that the ofdm system receiving terminal can receiving end/sending end sends, and data therefrom signal or pilot signal, and conveniently utilize wherein pilot signal to carry out channel estimating.
Embodiment two
A kind of schematic diagram that selection portion divides subcarrier that pilot signal is set in the available subcarrier of carrier resource that Fig. 3 provides for the embodiment of the invention two, described method can specifically comprise:
S21: adopt the Comb Pilot design rule, in the subcarrier of described carrier resource, pilot signal is set.
S22: judge whether the subcarrier that pilot signal is set is available;
S23: when the described subcarrier that pilot signal is set is unavailable, in the contiguous available subcarrier of this unavailable subcarrier, select a subcarrier as candidate's subcarrier that pilot signal is set;
S24: in described candidate's subcarrier, pilot signal is set.
Fig. 4 is a kind of schematic diagram that utilizes the Comb Pilot design rule that pilot signal is set in the carrier resource sub-carriers of the embodiment of the invention two.Transverse axis is represented frequency among Fig. 4, longitudinal axis express time, the corresponding frequency range of each subcarrier.That is to say that a string longitudinally round dot is represented a subcarrier, so can comprise a plurality of subcarriers in the carrier resource of certain frequency scope.In a string vertical round dot, each round dot is represented the constantly different of this subcarrier.The black round dot is represented that corresponding subcarrier is carved at this moment and is provided with pilot signal; The white round dot represents that corresponding subcarrier is carved at this moment pilot signal is not set that the subcarrier that pilot signal is not set is used to data signal.Here with N_f as the pilot interval under the Comb Pilot design rule, promptly whenever pilot signal is set at a distance of N_f subcarrier, described N_f meets the following conditions: N_f＜N/ (Ncp), N are total number of the interior subcarrier of carrier resource, and Ncp is the length of Cyclic Prefix.Subcarrier can be used for transmitting pilot signal specially, also can all transmit pilot signal constantly at all.For example, among Fig. 4 in the dotted line subcarrier D1, D2 and D3 go up at regular intervals that T is provided with pilot signal, other these subcarriers of moment can be used to Data transmission.Described time interval T meets the following conditions: T＜1/[2 (1+Ncp/N)/Vmax], the Vmax here represents the maximum translational speed of terminal.
In the practical application, because the band segment in the carrier resource is unavailable, pilot signal based on the setting of above-mentioned Comb Pilot design rule may be positioned at the disabled resource of frequency range, because subcarrier can't use in this disabled frequency range, corresponding pilot signal can not be sent out.Can select a subcarrier as candidate's subcarrier that pilot signal is set in contiguous, the available subcarrier of described unavailable subcarrier this moment.Specific implementation can for: in contiguous, the available subcarrier of this unavailable subcarrier, select with immediate, the available subcarrier of described unavailable sub-carrier positions as candidate's subcarrier that pilot signal is set.Be appreciated that, also can be used as candidate's subcarrier with described unavailable sub-carrier positions time subcarrier approaching or that other is locational, available, but immediate, the available subcarrier of utilization and described unavailable sub-carrier positions is optimum selection as candidate's subcarrier, and is more accurate based on the channel estimation value of this pilot tone set-up mode.
Fig. 5 is the schematic diagram of a kind of pilot signal set-up mode of the embodiment of the invention two.In Fig. 5, frequency range K6 is taken by other system user, and the subcarrier A1 that pilot signal is set is positioned at frequency range K6 again just, can with contiguous, the available subcarrier of subcarrier A1 in select a subcarrier that pilot signal is set.Herein will with immediate, the available subcarrier A2 in subcarrier A1 position as the subcarrier that pilot signal is set, solve the subcarrier A1 that pilot signal has been set fall into the pilot signal that causes in the unavailable frequency range can't problem of transmission.
In contiguous, the available subcarrier of unavailable subcarrier, immediate, the available subcarrier of selection and described unavailable sub-carrier positions can comprise as candidate's subcarrier that pilot signal is set: find the nearest available subcarrier in the left and right both sides of unavailable subcarrier respectively, the available subcarrier that more described left and right both sides are nearest and the distance of described unavailable subcarrier, obtain and the immediate available subcarrier of described unavailable subcarrier, with this immediate available subcarrier as candidate's subcarrier that pilot signal is set; If the nearest available subcarrier in the left and right both sides of described unavailable subcarrier equates with described unavailable subcarrier distance, with the immediate available subcarrier in a left side/the right as candidate's subcarrier.
Fig. 6 is the schematic diagram of another pilot signal set-up mode of the embodiment of the invention two.Fig. 6 Mid Frequency K7 is taken by other system user, and the subcarrier A3 that pilot signal is set is positioned at frequency range K7 again just, and all there is immediate, available subcarrier in the A3 left and right sides.That is to say that subcarrier A4 and A5 are available and distance A 3 distances are equal, can be defined among nearest subcarrier A4 in left side or the nearest subcarrier A5 in right side pilot signal is set, to guarantee the uniqueness of pilot signal set-up mode.At subcarrier A4 pilot signal is set among Fig. 6, but the technique of painting of Fig. 6 and be not used in qualification the present invention.
Be appreciated that when the subcarrier that pilot signal is set is unavailable,, then need not to reset pilot signal one time for the subcarrier that pilot signal is set if immediate, the available subcarrier of this unavailable subcarrier has been provided with pilot signal.Fig. 7 is the schematic diagram that a kind of subcarrier that has been provided with pilot signal of the embodiment of the invention two need not to reset pilot signal.This Fig. 7 Mid Frequency K8 is by other CU, and the subcarrier A6 that pilot signal is set is positioned at frequency range K8 again just, and with nearest, the available subcarrier A7 of subcarrier A6 in pilot signal has been set, need not to reset pilot signal for subcarrier A7.
Describedly in described candidate's subcarrier pilot signal is set and can comprises: judge described candidate's subcarrier and described unavailable subcarrier distance whether greater than N_f half, described N_f is the pilot interval under the described Comb Pilot design rule; When described candidate's subcarrier and described unavailable subcarrier distance are less than or equal to the half of N_f, in described candidate's subcarrier, pilot signal is set.That is to say that candidate's subcarrier periphery exists when the pilot signal subcarrier is set, can utilize the pilot signal sub-carrier channels estimated value that is provided with of periphery to replace candidate's sub-carrier channels estimated value, and needn't in candidate's subcarrier, pilot signal be set.
Fig. 8 is the schematic diagram of another pilot signal set-up mode of the embodiment of the invention two.In this Fig. 8, frequency range K9 is by other CU, and the subcarrier A8 that pilot signal is set is positioned at frequency range K9 again just, finds the adjacent sub-carrier with immediate, the available subcarrier A9 of subcarrier A8.A10, if find that by judging subcarrier A10 has been provided with pilot signal, can in subcarrier A9, pilot signal be set, because can utilize this moment the channel estimation value of subcarrier A10 to replace the channel estimation value of subcarrier A9 to carry out channel estimating, to reach the purpose of saving resource.In the practical application, can adopt following method: when the distance of subcarrier A10 and A9 half less than the spacing N_f of Comb Pilot design rule, just can utilize the channel estimation value of the channel estimation value replacement subcarrier A9 of subcarrier A10, also just needn't in subcarrier A9, pilot signal be set.
Present embodiment is by adopting the Comb Pilot design rule, in the subcarrier of described carrier resource, pilot signal is set, when the subcarrier that pilot signal is set is unavailable, in its contiguous, available subcarrier, select a subcarrier to transmit described pilot signal, can solve when the subcarrier that pilot signal is set is unavailable the problem that pilot signal can't be transmitted.
Embodiment three
The another kind schematic diagram that selection portion divides subcarrier that pilot signal is set in the available subcarrier of carrier resource that Fig. 9 provides for the embodiment of the invention three, described method can specifically comprise:
S31: continuous, available a plurality of subcarriers in the described carrier resource are divided into a frequency sub-band.
S32: adopt the Comb Pilot design rule, in the subcarrier of described frequency sub-band, pilot signal is set.
In the present embodiment, band segment may be disabled in the described carrier resource, available and continuous sub-carriers can be divided into a frequency sub-band, adopts the Comb Pilot design rule in described frequency sub-band sub-carriers pilot signal to be set.The rule that pilot signal is set can be n_k＞(N_k)/(N_f), n_k is a pilot signal number in the described subcarrier frequency range, N_k is the total number of subcarrier in the described subcarrier frequency range, N_f can satisfy N_f＜N/ (Ncp) as described in embodiment two, wherein N is total number of subcarrier in the carrier resource, and Ncp is the length of Cyclic Prefix.When pilot signal was set, the set-up mode that guarantee pilot signal was unique, pilot signal is evenly distributed in the subcarrier frequency range, thereby reach the good channel estimated result.
Embodiment four
The schematic diagram of a kind of channel estimation methods based on pilot signal that Figure 10 provides for embodiments of the invention four, this method can comprise the steps:
S41: obtain the carrier transmission pattern that pilot tone is provided with carrier resource in rule and the discontinuous multicarrier system.
S42: rule is set and described carrier transmission pattern obtains pilot signal situation is set according to described pilot tone, described pilot signal is arranged in the parton carrier wave of available subcarrier in the carrier resource.
S43: receive the multi-carrier signal that sends, situation is set, from described multi-carrier signal, obtain described pilot signal according to described pilot signal;
S44: calculate the subcarrier channel estimation that obtains to be provided with pilot signal according to described pilot signal;
S45: utilize the described subcarrier channel estimation that pilot signal is set to estimate other subcarrier channel estimation.
The present embodiment four-way is crossed the situation that discontinuous multicarrier system sub-carriers is transmitted pilot signal of obtaining, from the subcarrier that transmits pilot signal, obtain described pilot signal, can conveniently utilize pilot signal to carry out channel estimating, obtain the channel estimation results of each subcarrier.
Because in whole multicarrier system carrier resource, some subcarrier is unavailable, described pilot signal is to transmit by subcarrier available in the carrier resource.The multicarrier system transmitting terminal can send the subcarrier that is provided with pilot signal with the subcarrier that is provided with data-signal together by multi-carrier signal, the pilot signal that receiving terminal can obtain transmitting terminal is provided with situation, be provided with pilot signal so that be provided with in which subcarrier that situation knows that transmitting terminal sends, and from the multi-carrier signal that receives, obtain pilot signal by pilot signal.Receiving terminal can carry the carrier transmission pattern that message obtains transmitting terminal by the explicit broadcast or the synchronous reference signal implicit expression of transmitting terminal, and according to pilot signal rule and the be provided with situation of carrier transmission pattern acquisition pilot signal in subcarrier is set.Described pilot signal is provided with rule by the agency of among the embodiment in front, no longer describes in detail herein.Still with the ofdm system example, the OFDM symbol that the ofdm system receiving terminal can receiving end/sending end sends, thus and according to pilot signal situation is set and from the OFDM symbol, finds which subcarrier to be provided with pilot signal to obtain described pilot signal.
In step S43, can adopt least square method, according to the subcarrier channel estimation of described pilot signal calculating and setting pilot signal
In step S45, can at first find traditional pilot signal subcarrier that pilot signal is not set, described traditional pilot signal subcarrier is based on the subcarrier that continuous multicarrier system pilot design rule is provided with pilot signal; According to the sub-carrier channels estimated value that pilot signal is set, adopt interpolation calculation that traditional pilot signal subcarrier channel estimation of pilot signal is not set; According to traditional pilot signal subcarrier channel estimation, other is not provided with the sub-carrier channels estimated value of pilot signal to adopt interpolation calculation, and then realizes the estimation to whole channel.
Because the equipment that carries out channel estimating realizes based on the continuous multicarrier system pilot design rule of tradition that normally the conventional channel estimating apparatus will utilize traditional pilot signal subcarrier that other subcarrier is carried out channel estimating.And in embodiments of the present invention, some traditional pilot signal subcarrier is because unavailable and pilot signal can not be set, can take the lead in estimating traditional pilot signal subcarrier channel estimation this moment by the sub-carrier channels estimated value that pilot signal is set, can conveniently utilize traditional pilot signal subcarrier channel estimation that other subcarrier is carried out channel estimating then, less to the change of conventional channel estimating apparatus like this, can save hardware resource.
It will be understood by those skilled in the art that described interpolation method can comprise: linear interpolation, second order interpolation, low pass interpolation, methods such as galley proof interpolation.
One of ordinary skill in the art will appreciate that all or part of flow process among the said method embodiment, can instruct related hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Embodiment five
The structural representation of a kind of pilot signal dispensing device that Figure 11 provides for embodiments of the invention five, described dispensing device can comprise:
Transmission pattern acquisition module 51 is used for obtaining the carrier transmission pattern of discontinuous multicarrier system carrier resource;
Pilot tone is provided with module 52, is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module 51, and according to described carrier transmission pattern, selection portion divides subcarrier that pilot signal is set in the available subcarrier of described carrier resource;
Pilot tone sending module 53 is used to obtain the result that is provided with that pilot tone is provided with module, and subcarrier that pilot signal the is set form by multi-carrier signal is sent, and described pilot signal is used to offer receiving terminal so that discontinuous multicarrier system is carried out channel estimating.
The dispensing device of present embodiment can be selected available subcarrier setting and pilot signal transmitted in the carrier resource of discontinuous multicarrier system, carry out channel estimating according to pilot signal convenience is provided for follow-up.
In one implementation, described pilot tone is provided with module 52 and can comprises:
Pilot tone pre-sets the unit, is used to adopt the Comb Pilot design rule, in the subcarrier of described carrier resource pilot signal is set, and obtains being provided with the result;
Judging unit is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module 51, pre-sets the result that is provided with of unit according to described pilot tone, judges whether the subcarrier that pilot signal is set is available, obtains judged result;
Selected cell is used to obtain the judged result of described judging unit, when the described subcarrier that pilot signal is set is unavailable, selects a subcarrier as candidate's subcarrier that pilot signal is set in the contiguous available subcarrier of this unavailable subcarrier;
First pilot tone is provided with the unit, is used in described candidate's subcarrier pilot signal being set.
In contiguous, the available subcarrier of unavailable subcarrier, select a subcarrier can will repeat no more referring to the description among the previous methods embodiment two herein as the detailed process that candidate's subcarrier of pilot signal is set.
Further, described first pilot tone is provided with the unit and comprises: judgment sub-unit, be used to judge described candidate's subcarrier and described unavailable subcarrier distance whether greater than N_f half, and described N_f is the pilot interval under the described Comb Pilot design rule; Subelement is set, is used to obtain the judged result of judgment sub-unit,, in described candidate's subcarrier, pilot signal is set when described candidate's subcarrier and described unavailable subcarrier distance are less than or equal to the half of N_f.This first pilot tone is provided with the unit and can utilizes other subcarrier channel estimation that is provided with pilot signal of candidate's subcarrier periphery to replace candidate's sub-carrier channels estimated value, and pilot signal needn't be set in candidate's subcarrier, has saved resource.
In another kind of implementation, described pilot tone is provided with module 52 and can comprises:
The frequency range division unit is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module 51, and continuous, available a plurality of subcarriers in the described carrier resource are divided into a frequency sub-band;
Second pilot tone is provided with the unit, is used to obtain the division result of described frequency range division unit, and adopts the Comb Pilot design rule, in the subcarrier of described frequency sub-band pilot signal is set.
In actual applications, pilot tone sending module 53 can while pilot signal transmitted and data.With the ofdm system is example, the subcarrier that is provided with pilot signal and data-signal can be used as an OFDM symbol and sends, receiving terminal can obtain pilot signal carrying out channel estimating from the OFDM symbol, and can further utilize channel estimation value to parse the data message that transmitting terminal sends.The carrier transmission style information that dispensing device also can be provided with pilot tone carrier resource in rule and the discontinuous OFDM system sends to receiving terminal, so that receiving terminal obtains the be provided with situation of pilot signal in carrier resource with this.
Embodiment six
The structural representation of a kind of channel estimating apparatus based on pilot signal that Figure 12 provides for embodiments of the invention six, described device can comprise:
Regular pattern acquisition module 61 is used for obtaining the carrier transmission pattern that pilot tone is provided with rule and discontinuous multicarrier system carrier resource;
Situation judge module 62 is set, is used for rule being set and described carrier transmission pattern obtains pilot signal situation is set according to described pilot tone, described pilot signal is arranged in the parton carrier wave of available subcarrier in the carrier resource;
Pilot signal acquisition module 63 is used to receive the multi-carrier signal that sends, and according to described pilot signal situation is set, and obtains described pilot signal from described multi-carrier signal;
First channel estimation module 64 is used for calculating the subcarrier channel estimation that obtains to be provided with pilot signal according to described pilot signal;
Second channel estimation module 65 is used to utilize the described subcarrier channel estimation that pilot signal is set to estimate other subcarrier channel estimation.
Further, described second channel estimation module 65 can comprise:
Tradition pilot tone judging unit is used to find traditional pilot signal subcarrier that pilot signal is not set, and described traditional pilot signal subcarrier is based on the subcarrier that continuous multicarrier system pilot design rule is provided with pilot signal;
Tradition pilot tone estimation unit is used for the sub-carrier channels estimated value that pilot signal is set according to described, adopts interpolation calculation that traditional pilot signal subcarrier channel estimation of pilot signal is not set;
Non-pilot tone estimation unit is used for according to traditional pilot signal subcarrier channel estimation, and other is not provided with the sub-carrier channels estimated value of pilot signal to adopt interpolation calculation.
The channel estimating apparatus of present embodiment is by obtaining the pilot signal that is provided with in the subcarrier available in the discontinuous multicarrier system, utilize pilot signal to estimate its place subcarrier channel estimation, and then, can realize channel estimating to discontinuous multicarrier system by the channel estimation value on other subcarrier of interpolation calculation.But the sub-carrier channels estimated value of traditional pilot tone estimation unit calculating and setting pilot signal in this embodiment device, utilization is provided with the sub-carrier channels estimated value of pilot signal and obtains traditional pilot signal subcarrier channel estimation, non-pilot tone estimation unit utilizes traditional pilot signal subcarrier channel estimation, adopt traditional continuous multicarrier system interpolation computing method to estimate other subcarrier channel estimation, such method is changed less to the existing hardware facility, can save resource.Be appreciated that described channel estimating apparatus can make an independent device, also can be positioned at the pilot signal receiving terminal.
It will be understood by those skilled in the art that module and unit among above-mentioned two device embodiment both can be that hardware also can be software; Both can be module independently mutually, also can realize and each standalone module identical functions by splitting mutually or merging.
In sum, the embodiment of the invention is by obtaining the carrier transmission pattern of carrier resource in the discontinuous multicarrier system, in carrier resource, select available subcarrier to send and receive pilot signal, can conveniently utilize described pilot signal that discontinuous multicarrier system is carried out channel estimating, reduce traditional multicarrier system channel estimation methods and be applied to the channel estimation error that discontinuous multicarrier system occurs afterwards, improved the accuracy of discontinuous multicarrier system channel estimating.
The above only is several embodiments of the present invention, and those skilled in the art can carry out various changes or modification to the present invention according to the disclosed content of application documents and not break away from the spirit and scope of the present invention.
Claims (15)
1. a pilot signal transmission method is characterized in that, comprises the steps:
Obtain the carrier transmission pattern of carrier resource in the discontinuous multicarrier system;
According to described carrier transmission pattern, selection portion divides subcarrier that pilot signal is set in the available subcarrier of described carrier resource;
Subcarrier that pilot signal the is set form by multi-carrier signal is sent, and described pilot signal is used to offer receiving terminal so that discontinuous multicarrier system is carried out channel estimating.
2. the method for claim 1 is characterized in that, described in the available subcarrier of described carrier resource selection portion divide subcarrier that pilot signal is set to comprise:
Adopt the Comb Pilot design rule, in the subcarrier of described carrier resource, pilot signal is set;
Judge whether the subcarrier that pilot signal is set is available;
When the described subcarrier that pilot signal is set is unavailable, in the contiguous available subcarrier of described unavailable subcarrier, select a subcarrier as candidate's subcarrier that pilot signal is set;
In described candidate's subcarrier, pilot signal is set.
3. method as claimed in claim 2 is characterized in that, describedly selects a subcarrier to comprise as candidate's subcarrier that pilot signal is set in the contiguous available subcarrier of described unavailable subcarrier:
In the contiguous available subcarrier of described unavailable subcarrier, select to be provided with candidate's subcarrier of pilot signal with the immediate available subcarrier conduct of described unavailable sub-carrier positions.
4. method as claimed in claim 3 is characterized in that, and is described in the contiguous available subcarrier of described unavailable subcarrier, selects to comprise as candidate's subcarrier that pilot signal is set with the immediate available subcarrier of described unavailable sub-carrier positions:
Find the immediate available subcarrier in the left and right both sides of described unavailable subcarrier respectively, the distance of immediate available subcarrier in more described left and right both sides and described unavailable subcarrier, obtain and the immediate available subcarrier of described unavailable subcarrier, with described immediate available subcarrier as candidate's subcarrier that pilot signal is set;
If the immediate available subcarrier in the left and right both sides of described unavailable subcarrier equates with described unavailable subcarrier distance, with the immediate available subcarrier in a left side/the right as candidate's subcarrier.
5. method as claimed in claim 2 is characterized in that, describedly in described candidate's subcarrier pilot signal is set and comprises:
Judge described candidate's subcarrier and described unavailable subcarrier distance whether greater than N_f half, described N_f is the pilot interval under the described Comb Pilot design rule;
When described candidate's subcarrier and described unavailable subcarrier distance are less than or equal to the half of N_f, in described candidate's subcarrier, pilot signal is set.
6. the method for claim 1 is characterized in that, described in the available subcarrier of described carrier resource selection portion divide subcarrier that pilot signal is set to comprise:
Continuous, available a plurality of subcarriers in the described carrier resource are divided into a frequency sub-band;
Adopt the Comb Pilot design rule, in the subcarrier of described frequency sub-band, pilot signal is set.
7. as each described method in the claim 1 to 6, it is characterized in that the described carrier transmission pattern that obtains carrier resource in the discontinuous multicarrier system comprises:
Transmitting terminal in the discontinuous multicarrier system can detect by self or with node joint-detection on every side, or the frequency spectrum that obtains carrier resource in the described system from connect database takies situation;
Take situation and the system subcarrier bandwidth is determined the carrier transmission pattern according to described frequency spectrum.
8. the channel estimation methods based on pilot signal is characterized in that, comprises the steps:
Obtain the carrier transmission pattern that pilot tone is provided with carrier resource in rule and the discontinuous multicarrier system;
Rule is set and described carrier transmission pattern obtains pilot signal situation is set according to described pilot tone, described pilot signal is arranged in the parton carrier wave of available subcarrier in the carrier resource;
The multi-carrier signal that reception is sent is provided with situation according to described pilot signal, obtains described pilot signal from described multi-carrier signal;
Calculate the subcarrier channel estimation that obtains to be provided with pilot signal according to described pilot signal;
Utilize the described subcarrier channel estimation that pilot signal is set to estimate other subcarrier channel estimation.
9. method as claimed in claim 8 is characterized in that, describedly utilizes the described subcarrier channel estimation that pilot signal is set to estimate that other subcarrier channel estimation comprises:
Find traditional pilot signal subcarrier that pilot signal is not set, described traditional pilot signal subcarrier is based on the subcarrier that continuous multicarrier system pilot design rule is provided with pilot signal;
According to the described sub-carrier channels estimated value that pilot signal is set, adopt interpolation calculation that traditional pilot signal subcarrier channel estimation of pilot signal is not set;
According to traditional pilot signal subcarrier channel estimation, other is not provided with the sub-carrier channels estimated value of pilot signal to adopt interpolation calculation.
10. a pilot signal dispensing device is characterized in that, comprising:
The transmission pattern acquisition module is used for obtaining the carrier transmission pattern of discontinuous multicarrier system carrier resource;
Pilot tone is provided with module, is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module, and according to described carrier transmission pattern, selection portion divides subcarrier that pilot signal is set in the available subcarrier of described carrier resource;
The pilot tone sending module is used to obtain the result that is provided with that pilot tone is provided with module, and subcarrier that pilot signal the is set form by multi-carrier signal is sent, and described pilot signal is used to offer receiving terminal so that discontinuous multicarrier system is carried out channel estimating.
11. device as claimed in claim 10 is characterized in that, described pilot tone is provided with module and comprises:
Pilot tone pre-sets the unit, is used to adopt the Comb Pilot design rule, in the subcarrier of described carrier resource pilot signal is set, and obtains being provided with the result;
Judging unit is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module, pre-sets the result that is provided with of unit according to described pilot tone, judges whether the subcarrier that pilot signal is set is available, obtains judged result;
Selected cell is used to obtain the judged result of described judging unit, when the described subcarrier that pilot signal is set is unavailable, selects a subcarrier as candidate's subcarrier that pilot signal is set in the contiguous available subcarrier of described unavailable subcarrier;
First pilot tone is provided with the unit, is used in described candidate's subcarrier pilot signal being set.
12. device as claimed in claim 10 is characterized in that, described first pilot tone is provided with the unit and comprises:
Judgment sub-unit is used to judge described candidate's subcarrier and described unavailable subcarrier distance whether greater than N_f half, and described N_f is the pilot interval under the described Comb Pilot design rule;
Subelement is set, is used to obtain the judged result of judgment sub-unit,, in described candidate's subcarrier, pilot signal is set when described candidate's subcarrier and described unavailable subcarrier distance are less than or equal to the half of N f.
13. device as claimed in claim 10 is characterized in that, described pilot tone is transmitted module and is comprised:
The frequency range division unit is used for obtaining described carrier transmission pattern from described transmission pattern acquisition module, and continuous, available a plurality of subcarriers in the described carrier resource are divided into a frequency sub-band;
Second pilot tone is provided with the unit, is used to obtain the division result of described frequency range division unit, and adopts the Comb Pilot design rule, in the subcarrier of described frequency sub-band pilot signal is set.
14. the channel estimating apparatus based on pilot signal is characterized in that, comprising:
The regular pattern acquisition module is used for obtaining the carrier transmission pattern that pilot tone is provided with rule and discontinuous multicarrier system carrier resource;
The situation judge module is set, is used for rule being set and described carrier transmission pattern obtains pilot signal situation is set according to described pilot tone, described pilot signal is arranged in the parton carrier wave of available subcarrier in the carrier resource;
The pilot signal acquisition module is used to receive the multi-carrier signal that sends, and according to described pilot signal situation is set, and obtains described pilot signal from described multi-carrier signal;
First channel estimation module is used for calculating the subcarrier channel estimation that obtains to be provided with pilot signal according to described pilot signal;
The second channel estimation module is used to utilize the described subcarrier channel estimation that pilot signal is set to estimate other subcarrier channel estimation.
15. device as claimed in claim 14 is characterized in that, described second channel estimation module comprises:
Tradition pilot tone judging unit is used to find traditional pilot signal subcarrier that pilot signal is not set, and described traditional pilot signal subcarrier is based on the subcarrier that continuous multicarrier system pilot design rule is provided with pilot signal;
Tradition pilot tone estimation unit is used for the sub-carrier channels estimated value that pilot signal is set according to described, adopts interpolation calculation that traditional pilot signal subcarrier channel estimation of pilot signal is not set;
Non-pilot tone estimation unit is used for according to traditional pilot signal subcarrier channel estimation, and other is not provided with the sub-carrier channels estimated value of pilot signal to adopt interpolation calculation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910106344A CN101848175A (en) | 2009-03-24 | 2009-03-24 | Methods and devices for pilot signal transmitting and pilot signal-based channel estimation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910106344A CN101848175A (en) | 2009-03-24 | 2009-03-24 | Methods and devices for pilot signal transmitting and pilot signal-based channel estimation |
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