CN105356986A - Reference signal generation method, base station, channel estimation method and terminal - Google Patents

Abstract

An embodiment of the invention provides a reference signal generation method, a base station, a channel estimation method and a terminal. The method includes the steps of: generating an RS sequence of 100 RBs with 20M bandwidth, one RB corresponding to a set of RSs, and a set of RSs having a plurality of RSs; configuring a cyclic shift value, and according to the cyclic shift value, moving the RSs of each RB to the RB corresponding to the cyclic shift value, and obtaining an RS sequence after a cyclic shift of the RSs, the ordinal number of the last RB and the ordinal number of the first RB are in circulation; and according to the actual bandwidth of an LTE system, extracting the RS set of a target RB from the RS sequence after the cyclic shift of RSs, obtaining a target RS sequence, and correlating the target RS sequence with a time frequency position corresponding to the actual bandwidth. The reference signal generation method provided by the embodiment of the invention can reduce interference directly generated by the RS sequence in application of the LTE system in a private network.

Description

A kind of reference signal generation method, base station, channel estimation methods and terminal

Technical field

The present invention relates to communication technical field, be specifically related to a kind of reference signal generation method, base station, channel estimation methods and terminal.

Background technology

LTE (LongTermEvolution Long Term Evolution) system is thought 4G (the forth generation communication technology) wireless communication system widely, it has the transmission rate of descending 100M (million) up 50M, support higher translational speed (350km/h) and larger coverage radius of cell (100 kilometers) simultaneously, support that 200, every community user is simultaneously online; In addition, LTE system also has band width configuration (1.4M ~ 20M) flexibly, supports the feature such as multi-media broadcasting service and end-to-end QoS; What LTE physical layer adopted is OFDM (OFDM) technology.

In recent years, except being used widely in commercial market, the application of LTE system in private network field is also more and more general, as smart city, and public security, fire-fighting, the professional domains such as electric power all can be applied to LTE system; Some problems can be there are in the application of LTE system in private network field:

In LTE protocol planning, the RS time-frequency location of identical CELL (community) ID (mark) and RS (RefenceSignal, reference signal) sequence content is all the same, therefore when civilian public network is arranged net, in order to avoid presence of intercell interference, the general interval, community of identical CELLID is far away; But in private network application, limit or arrange net lack of standardization due to objective condition, the community potential range of identical CELLID can be caused comparatively near, and now RS sequence directly can produce interference, causes channel estimating inaccurate; Based on this, need badly and a kind of new reference signal generation method is provided, to reduce LTE system in private network application, the interference directly produced by RS sequence.

Summary of the invention

In view of this, the embodiment of the present invention provides a kind of reference signal generation method, base station, channel estimation methods and terminal, to reduce LTE system in private network application, the interference directly produced by RS sequence.

For achieving the above object, the embodiment of the present invention provides following technical scheme:

A kind of reference signal generation method, be applied to base station, described method comprises:

With 20M bandwidth, generate the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

According to the actual bandwidth of LTE system, from the RS sequence after RS cyclic shift, extract the RS group of target RB, obtain target RS sequence, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.

Wherein, the described actual bandwidth according to LTE system, extracts the RS group of target RB from the RS sequence after RS cyclic shift, obtains target RS sequence and comprises:

The quantity of target RB is searched according to described actual bandwidth;

Extract the RS group of the RB of the described quantity of the centre of the RS sequence after RS cyclic shift, obtain target RS sequence.

Wherein, described according to described cyclic shift value, the RS of each RB is moved to the RB corresponding with described cyclic shift value and comprise:

For each RB, with described cyclic shift value location RS move to RB;

For each RB, RS corresponding for RB is moved in located RB.

The embodiment of the present invention also provides a kind of base station, comprising:

RS sequence generating module, for 20M bandwidth, generates the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Circular shift module, for configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

Target RS sequential extraction procedures module, for the actual bandwidth according to LTE system, extracts the RS group of target RB, obtains target RS sequence from the RS sequence after RS cyclic shift, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.

Wherein, described target RS sequential extraction procedures module comprises:

Extract quantity determining unit, for searching the quantity of target RB according to described actual bandwidth;

RS extraction unit, for extracting the RS group of the RB of the described quantity of the centre of the RS sequence after RS cyclic shift, obtains target RS sequence.

The embodiment of the present invention also provides a kind of channel estimation methods, is applied to terminal, and described method comprises:

With 1.4M bandwidth, available frequency obtains cell ID and timing information;

With 20M bandwidth, generate the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Determine the scope of cyclic shift value, for each cyclic shift value in described scope, successively with each cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtain the RS sequence after RS cyclic shift corresponding to each cyclic shift value; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

For the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding, respectively with 1.4M bandwidth, extract the RS group of target RB, obtain the new RS sequence that each cyclic shift value is corresponding;

By new RS sequence corresponding for each cyclic shift value, carry out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength, and record the relevant performance number of each new RS sequence;

The cyclic shift value that in the performance number of be correlated with each new RS sequence, maximum power value is corresponding, is defined as the cyclic shift value of base station configuration;

According to the cyclic shift value that determined base station configures, in the system bandwidth of 1.4M, with described cell ID and timing information demodulation PBCH, obtain demodulation gained information;

System bandwidth is switched to actual bandwidth, utilizes described demodulation gained demodulates information system information, obtain channel-estimation information.

Wherein, described by new RS sequence corresponding for each cyclic shift value, carry out relevant comprising to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength:

For the new RS sequence that each cyclic shift value is corresponding, according to formula $Corr\_{\mathrm{Result}}_{Ncs}=\underset{i=0}{\overset{47}{\Σ}}Local\_{{\mathrm{RS}}_{Ncs}}^{*}\left(i\right)*Rx\_RS\left(i\right),$ New RS sequence is carried out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength;

Wherein, Rx_RS (i) is the RS of i-th in present sub-frame, Local_RS _ncsi-th RS in i new RS sequence that () is acquisition; Corr_Result _ncsfor the correlation of the RS sequence of new RS sequence time-frequency location corresponding to the subframe of Received signal strength.

Wherein, the described performance number recording each new RS sequence relevant comprises:

For the new RS sequence that each cyclic shift value is corresponding, according to formula Corr_Power _ncs=|| Corr_Result _ncs|| ²the performance number that record is relevant;

Wherein, Corr_Power _ncsfor relevant performance number, Corr_Result _ncsand Corr_Power _ncscorresponding with used cyclic shift value.

Wherein, the RS sequence after the described RS cyclic shift corresponding for each cyclic shift value, respectively with 1.4M bandwidth, extract the RS group of target RB, the new RS sequence obtaining each cyclic shift value corresponding comprises:

For the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding, in the middle of extracting, the RS of 6 RB, forms new RS sequence.

The embodiment of the present invention also provides a kind of terminal, comprising:

Cell information acquisition module, for 1.4M bandwidth, available frequency obtains cell ID and timing information;

Sequence generating module, for 20M bandwidth, generates the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Traversal circular shift module, for determining the scope of cyclic shift value, for each cyclic shift value in described scope, successively with each cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtains the RS sequence after RS cyclic shift corresponding to each cyclic shift value; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

New RS retrieval module, for for the RS sequence after RS cyclic shift corresponding to each cyclic shift value, respectively with 1.4M bandwidth, extracts the RS group of target RB, obtains the new RS sequence that each cyclic shift value is corresponding;

Be correlated with and performance number logging modle, for by new RS sequence corresponding for each cyclic shift value, carry out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength, and record the relevant performance number of each new RS sequence;

Cyclic shift value determination module, for the cyclic shift value that maximum power value in the performance number of each new RS sequence being correlated with is corresponding, is defined as the cyclic shift value of base station configuration;

Channel demodulation module, for the cyclic shift value configured according to determined base station, in the system bandwidth of 1.4M, with described cell ID and timing information demodulation PBCH, obtains demodulation gained information;

System information demodulation module, for system bandwidth is switched to actual bandwidth, utilizes described demodulation gained demodulates information system information, obtains channel-estimation information.

Based on technique scheme, the reference signal generation method that the embodiment of the present invention provides, comprising: with 20M bandwidth, generates the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB; Configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually; According to the actual bandwidth of LTE system, from the RS sequence after RS cyclic shift, extract the RS group of target RB, obtain target RS sequence, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.Because the embodiment of the present invention is for the LTE system of different bandwidth, all the RS sequences of the RB generating benchmark according to 20M bandwidth, after the RS sequence of the RB of the benchmark of 20M bandwidth generation is carried out the cyclic shift of RS, target RS sequence is gone out again according to actual bandwidth requirement extract, as the reference signal of the LTE system of actual bandwidth, this makes the LTE system for any practical bandwidth, the embodiment of the present invention all draws corresponding reference signal by the process of the RS sequence of the RB to benchmark, drawn reference signal can be matched with the actual bandwidth of LTE system, thus reduce LTE system in private network application, the interference directly produced by RS sequence.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.

The flow chart of the reference signal generation method that Fig. 1 provides for the embodiment of the present invention;

The schematic diagram of the RS sequence that Fig. 2 provides for the embodiment of the present invention;

The schematic diagram RS in RS sequence being carried out to cyclic shift that Fig. 3 provides for the embodiment of the present invention;

The schematic diagram of the extraction target RS sequence that Fig. 4 provides for the embodiment of the present invention;

The flow chart of the channel estimation methods that Fig. 5 provides for the embodiment of the present invention;

The structured flowchart of the base station that Fig. 6 provides for the embodiment of the present invention;

The structured flowchart of the target RS sequential extraction procedures module that Fig. 7 provides for the embodiment of the present invention;

The structured flowchart of the circular shift module that Fig. 8 provides for the embodiment of the present invention;

The structured flowchart of the terminal that Fig. 9 provides for the embodiment of the present invention;

The structured flowchart of the relevant and performance number logging modle that Figure 10 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

The flow chart of the reference signal generation method that Fig. 1 provides for the embodiment of the present invention, the method can be applicable to base station, and with reference to Fig. 1, the method can comprise:

Step S100, with 20M bandwidth, generate the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

With port0, CELLID=0 for example, Fig. 2 shows the schematic diagram of the RS sequence of 100 RB (ResourceBlock, Resource Block), in these 100 RB of RB0 to RB99, and all corresponding one group of RS of each RB, define RS sequence, one group of RS is made up of multiple RS; Such as, a port is only used in base station, and a RB may correspond to 8 RS, if 2 port in base station, then a RB may correspond to 16 RS, if 4 port in base station, then a RB may correspond to 24 RS;

In RB except RS (RS R as shown in Figure 2 ₀), also there are other subcarrier datas (blank parts of other sub-carrier numbers as shown in Figure 2 in RB).

Step S110, configuration cycles shift value, according to described cyclic shift value, move the RS of each RB in the RB corresponding with described cyclic shift value, obtain the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

The span of cyclic shift value Ncs can be the integer of 1 to 99, and the cyclic shift value configured can be the integer chosen in this span;

The process of RS cyclic shift is: circulated mutually (as RB99 is recycled to RB0) by the ordinal number of ordinal sum first RB of last RB, in units of RB, in the RB that RS integral shift in RB to the cyclic shift value (Ncs) configured is located, and other subcarrier datas in RB are constant, by that analogy, until the RS of all RB has all moved;

During for Ncs=1, Fig. 3 shows the schematic diagram of RS cyclic shift, and the RS of RB0 moves in RB1, and the RS of RB1 moves in RB2 ..., the RS of RB98 moves in RB99, circulates mutually based on RB99 and RB0, and the RS of RB99 moves in RB0; RS cyclic shift process under other value condition of Ncs therewith in like manner;

This shows, the embodiment of the present invention is when carrying out RS cyclic shift process, can for each RB, with configured cyclic shift value location RS move to RB, during as Ncs=1, the RS that RB0 navigates to move to RB be RB1, and then for each RB, the RS in RB to be moved in located RB; After the RS of each RB all completes above-mentioned process, then complete the process to RS cyclic shift.

Step S120, actual bandwidth according to LTE system, extract the RS group of target RB, obtain target RS sequence, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence from the RS sequence after RS cyclic shift.

Optionally, after determining actual bandwidth, the embodiment of the present invention can find the quantity of RB corresponding to actual bandwidth, thus obtains the quantity of target RB; And then extract the RS group of RB of described quantity of centre of the RS sequence after RS cyclic shift, obtain target RS sequence;

As shown in Figure 4, if actual bandwidth is the LTE system of 20M, can determine that the quantity of corresponding RB is 100, then can using overall for the RS sequence after RS cyclic shift as target RS sequence;

If actual bandwidth is the LTE system of 15M, can determine that the quantity of corresponding RB is 75, then the RS group of 75 RB in the middle of the RS sequence after RS cyclic shift can be extracted, as target RS sequence;

If actual bandwidth is the LTE system of 10M, can determine that the quantity of corresponding RB is 50, then the RS group of 50 RB in the middle of the RS sequence after RS cyclic shift can be extracted, as target RS sequence;

If actual bandwidth is the LTE system of 5M, can determine that the quantity of corresponding RB is 25, then the RS group of 25 RB in the middle of the RS sequence after RS cyclic shift can be extracted, as target RS sequence;

If actual bandwidth is the LTE system of 3M, can determine that the quantity of corresponding RB is 15, then the RS group of 15 RB in the middle of the RS sequence after RS cyclic shift can be extracted, as target RS sequence;

If actual bandwidth is the LTE system of 1.4M, can determine that the quantity of corresponding RB is 6, then the RS group of 6 RB in the middle of the RS sequence after RS cyclic shift can be extracted, as target RS sequence.

The target RS sequence that the embodiment of the present invention extracts, can be relevant by time-frequency location corresponding to described actual bandwidth for described target RS sequence namely as generated reference signal, as target RS sequence put into corresponding time-frequency location.

The reference signal generation method that the embodiment of the present invention provides, comprising: with 20M bandwidth, generates the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB; Configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually; According to the actual bandwidth of LTE system, from the RS sequence after RS cyclic shift, extract the RS group of target RB, obtain target RS sequence, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.Because the embodiment of the present invention is for the LTE system of different bandwidth, all the RS sequences of the RB generating benchmark according to 20M bandwidth, after the RS sequence of the benchmark RB of 20M bandwidth generation is carried out the cyclic shift of RS, target RS sequence is gone out again according to actual bandwidth requirement extract, as the reference signal of the LTE system of actual bandwidth, this makes the LTE system for any practical bandwidth, the embodiment of the present invention all draws corresponding reference signal by the process of the RS sequence of the RB to benchmark, drawn reference signal can be matched with the actual bandwidth of LTE system, thus reduce LTE system in private network application, the interference directly produced by RS sequence.

Optionally, the RS of embodiment of the present invention indication can be the RS of community, RS etc. as corresponding in port0, port1, port2, port3.

On the basis of the reference signal generation method described above, how LTE terminal side is completed to the identification of reference signal cyclic shift below by the demodulation of PBCH (Physical Broadcast Channel), thus the process obtaining correct channel-estimation information is described.

In prior art, the resident community of LTE terminal start, obtaining the process of channel estimating is: terminal frequency sweep obtains available frequency, and the system bandwidth of end side is configured to 1.4M, and on this frequency search cell, obtain community ID and timing information; Terminal, in the system bandwidth of 1.4M, according to community ID and timing information demodulation PBCH, obtains bandwidth, the demodulation gained information such as radio frame number; Bandwidth is switched to actual bandwidth, according to demodulation gained demodulates information system information, obtains channel-estimation information, complete resident process.

But, in embodiments of the present invention, the reference signal that sends due to base station side has been through cyclic shift, therefore in the embodiment of the present invention end side before demodulation PBCH, need the cyclic shift value Ncs determining that base station side configures, and then just can based on this Ncs demodulation PBCH.

The flow chart of the channel estimation methods that Fig. 5 provides for the embodiment of the present invention, the method can be applicable to terminal, and with reference to Fig. 5, the method can comprise:

Step S200, with 1.4M bandwidth, available frequency obtains cell ID and timing information;

The embodiment of the present invention frequency sweep can obtain available frequency, and the system bandwidth of end side is configured to 1.4M, and search cell on the available frequency obtained in this frequency sweep, obtain community ID and timing information.

Step S210, with 20M bandwidth, generate the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

The concrete introduction of step S210 can refer to step S100 part shown in Fig. 1.

Step S220, determine the scope of cyclic shift value, for each cyclic shift value in described scope, successively with each cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtain the RS sequence after RS cyclic shift corresponding to each cyclic shift value; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

The scope of cyclic shift value Ncs is the integer of 1 to 99, the embodiment of the present invention need travel through each integer of 1 to 99, successively with 1 to 99 each integer for cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtains the RS sequence after RS cyclic shift corresponding to each cyclic shift value; The processing procedure of the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding can step S110 part as shown in Figure 1; Through above-mentioned process, each integer that the embodiment of the present invention can obtain 1 to 99 is cyclic shift value, the RS sequence after corresponding RS cyclic shift.

Step S230, for the RS sequence after RS cyclic shift corresponding to each cyclic shift value, respectively with 1.4M bandwidth, extract the RS group of target RB, obtain the new RS sequence that each cyclic shift value is corresponding;

Optionally, under 1.4M bandwidth situation, the embodiment of the present invention can determine that the target RB quantity need extracted from the RS sequence after cyclic shift is 6; For the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding, the embodiment of the present invention can extract the RS of 6 RB in centre of the RS sequence after cyclic shift, obtains the new RS sequence that each cyclic shift value is corresponding.

Step S240, by new RS sequence corresponding for each cyclic shift value, carry out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength, and record the relevant performance number of each new RS sequence;

Optionally, the embodiment of the present invention, can according to formula for new RS sequence corresponding to each cyclic shift value $Corr\_{\mathrm{Result}}_{Ncs}=\underset{i=0}{\overset{47}{\Σ}}Local\_{{\mathrm{RS}}_{Ncs}}^{*}\left(i\right)*Rx\_RS\left(i\right),$ New RS sequence is carried out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength;

Wherein, Rx_RS (i) is the RS of i-th in present sub-frame, Local_RS _ncsi-th RS in i new RS sequence that () is acquisition; Corr_Result _ncsfor the correlation of the RS sequence of new RS sequence time-frequency location corresponding to the subframe of Received signal strength;

Further, for the new RS sequence that each cyclic shift value is corresponding, the embodiment of the present invention can according to formula Corr_Power _ncs=|| Corr_Result _ncs|| ²the performance number that record is relevant;

Wherein, Corr_Power _ncsfor relevant performance number, Corr_Result _ncsand Corr_Power _ncscorresponding with used cyclic shift value.

Optionally, for TDD system, above-mentioned computing formula can perform for subframe 0 or subframe 5, and for FDD system, above-mentioned computing formula can perform for any subframe; Further, above-mentioned computing formula can perform for port0;

In Rx_RS (i), the span of i can be 0 ~ 47, because in the system of 1.4M, and the RS containing 48 port0 in each subframe.

The cyclic shift value that in step S250, the performance number of each new RS sequence being correlated with, maximum power value is corresponding, is defined as the cyclic shift value of base station configuration;

Step S260, the cyclic shift value configured according to determined base station, in the system bandwidth of 1.4M, with described cell ID and timing information demodulation PBCH, obtain demodulation gained information;

Step S270, system bandwidth is switched to actual bandwidth, utilize described demodulation gained demodulates information system information, obtain channel-estimation information.

Can find out, in the channel estimation methods that the embodiment of the present invention provides, the cyclic shift value that terminal can be used according to base station side generating reference signal, demodulation PBCH, thus make obtained channel-estimation information more accurate.

Below the base station that the embodiment of the present invention provides is introduced, base station described below can with above with the mutual corresponding reference of reference signal generation method that base station angle describes.

The structured flowchart of the base station that Fig. 6 provides for the embodiment of the present invention, with reference to Fig. 6, this base station can comprise:

RS sequence generating module 100, for 20M bandwidth, generates the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Circular shift module 110, for configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

Target RS sequential extraction procedures module 120, for the actual bandwidth according to LTE system, extracts the RS group of target RB, obtains target RS sequence from the RS sequence after RS cyclic shift, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.

Optionally, Fig. 7 shows a kind of alternate configurations of target RS sequential extraction procedures module 120, can comprise with reference to Fig. 7, target RS sequential extraction procedures module 120:

Extract quantity determining unit 121, for searching the quantity of target RB according to described actual bandwidth;

RS extraction unit 122, for extracting the RS group of the RB of the described quantity of the centre of the RS sequence after RS cyclic shift, obtains target RS sequence.

Optionally, Fig. 8 shows the alternate configurations of circular shift module 110, and with reference to Fig. 8, circular shift module 110 can comprise:

Sequence positioning unit 111, for for each RB, with described cyclic shift value location RS move to RB;

Move unit 112, for for each RB, RS corresponding for RB is moved in located RB.

Below the terminal that the embodiment of the present invention provides is introduced, terminal described below can with above with the mutual corresponding reference of channel estimation methods that terminal point describes.

The structured flowchart of the terminal that Fig. 9 provides for the embodiment of the present invention, with reference to Fig. 9, this terminal can comprise:

Cell information acquisition module 200, for 1.4M bandwidth, available frequency obtains cell ID and timing information;

Sequence generating module 210, for 20M bandwidth, generates the RS sequence of 100 RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Traversal circular shift module 220, for determining the scope of cyclic shift value, for each cyclic shift value in described scope, successively with each cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtains the RS sequence after RS cyclic shift corresponding to each cyclic shift value; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

New RS retrieval module 230, for for the RS sequence after RS cyclic shift corresponding to each cyclic shift value, respectively with 1.4M bandwidth, extracts the RS group of target RB, obtains the new RS sequence that each cyclic shift value is corresponding;

Be correlated with and performance number logging modle 240, for by new RS sequence corresponding for each cyclic shift value, carry out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength, and record the relevant performance number of each new RS sequence;

Cyclic shift value determination module 250, for the cyclic shift value that maximum power value in the performance number of each new RS sequence being correlated with is corresponding, is defined as the cyclic shift value of base station configuration;

Channel demodulation module 260, for the cyclic shift value configured according to determined base station, in the system bandwidth of 1.4M, with described cell ID and timing information demodulation PBCH, obtains demodulation gained information;

System information demodulation module 270, for system bandwidth is switched to actual bandwidth, utilizes described demodulation gained demodulates information system information, obtains channel-estimation information.

Optionally, Figure 10 shows the alternate configurations of the relevant and performance number logging modle 240 that the embodiment of the present invention provides, and with reference to Figure 10, relevant and performance number logging modle 240 can comprise:

Correlation unit 241, for for new RS sequence corresponding to each cyclic shift value, according to formula $Corr\_{\mathrm{Result}}_{Ncs}=\underset{i=0}{\overset{47}{\Σ}}Local\_{{\mathrm{RS}}_{Ncs}}^{*}\left(i\right)*Rx\_RS\left(i\right),$ New RS sequence is carried out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength;

Wherein, Rx_RS (i) is the RS of i-th in present sub-frame, Local_RS _ncsi-th RS in i new RS sequence that () is acquisition; Corr_Result _ncsfor the correlation of the RS sequence of new RS sequence time-frequency location corresponding to the subframe of Received signal strength;

Performance number record cell 242, for for new RS sequence corresponding to each cyclic shift value, according to formula Corr_Power _ncs=|| Corr_Result _ncs|| ²the performance number that record is relevant;

Wherein, Corr_Power _ncsfor relevant performance number, Corr_Result _ncsand Corr_Power _ncscorresponding with used cyclic shift value.

Optionally, new RS retrieval module 230 specifically can be used for, and for the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding, in the middle of extracting, the RS of 6 RB, forms new RS sequence.

In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.

Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.

The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.

To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. a reference signal generation method, is characterized in that, be applied to base station, and described method comprises:

With 20M bandwidth, generate the reference signal RS sequence of 100 Resource Block RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

According to the actual bandwidth of LTE system, from the RS sequence after RS cyclic shift, extract the RS group of target RB, obtain target RS sequence, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.

2. reference signal generation method according to claim 1, is characterized in that, the described actual bandwidth according to LTE system, extracts the RS group of target RB from the RS sequence after RS cyclic shift, obtains target RS sequence and comprises:

The quantity of target RB is searched according to described actual bandwidth;

Extract the RS group of the RB of the described quantity of the centre of the RS sequence after RS cyclic shift, obtain target RS sequence.

3. reference signal generation method according to claim 1 and 2, is characterized in that, described according to described cyclic shift value, is moved by the RS of each RB to the RB corresponding with described cyclic shift value and comprises:

For each RB, with described cyclic shift value location RS move to RB;

For each RB, RS corresponding for RB is moved in located RB.

4. a base station, is characterized in that, comprising:

RS sequence generating module, for 20M bandwidth, generates the reference signal RS sequence of 100 Resource Block RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Circular shift module, for configuration cycles shift value, according to described cyclic shift value, moves the RS of each RB in the RB corresponding with described cyclic shift value, obtains the RS sequence after RS cyclic shift; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

Target RS sequential extraction procedures module, for the actual bandwidth according to LTE system, extracts the RS group of target RB, obtains target RS sequence from the RS sequence after RS cyclic shift, by relevant for time-frequency location corresponding to described actual bandwidth for described target RS sequence.

5. base station according to claim 4, is characterized in that, described target RS sequential extraction procedures module comprises:

Extract quantity determining unit, for searching the quantity of target RB according to described actual bandwidth;

RS extraction unit, for extracting the RS group of the RB of the described quantity of the centre of the RS sequence after RS cyclic shift, obtains target RS sequence.

6. a channel estimation methods, is characterized in that, is applied to terminal, and described method comprises:

With 1.4M bandwidth, available frequency obtains cell ID and timing information;

With 20M bandwidth, generate the reference signal RS sequence of 100 Resource Block RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Determine the scope of cyclic shift value, for each cyclic shift value in described scope, successively with each cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtain the RS sequence after RS cyclic shift corresponding to each cyclic shift value; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

For the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding, respectively with 1.4M bandwidth, extract the RS group of target RB, obtain the new RS sequence that each cyclic shift value is corresponding;

By new RS sequence corresponding for each cyclic shift value, carry out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength, and record the relevant performance number of each new RS sequence;

The cyclic shift value that in the performance number of be correlated with each new RS sequence, maximum power value is corresponding, is defined as the cyclic shift value of base station configuration;

According to the cyclic shift value that determined base station configures, in the system bandwidth of 1.4M, with described cell ID and timing information demodulation PBCH, obtain demodulation gained information;

System bandwidth is switched to actual bandwidth, utilizes described demodulation gained demodulates information system information, obtain channel-estimation information.

7. channel estimation methods according to claim 6, is characterized in that, described by new RS sequence corresponding for each cyclic shift value, carries out relevant comprising to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength:

For the new RS sequence that each cyclic shift value is corresponding, according to formula $Corr\_{\mathrm{Result}}_{Ncs}=\underset{i=0}{\overset{47}{\Σ}}Local\_{{\mathrm{RS}}_{Ncs}}^{*}\left(i\right)*Rx\_RS\left(i\right),$ New RS sequence is carried out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength;

Wherein, Rx_RS (i) is the RS of i-th in present sub-frame, Local_RS _ncsi () is i-th RS in new RS sequence; Corr_Result _ncsfor the correlation of the RS sequence of new RS sequence time-frequency location corresponding to the subframe of Received signal strength.

8. channel estimation methods according to claim 7, is characterized in that, the described performance number recording each new RS sequence relevant comprises:

For the new RS sequence that each cyclic shift value is corresponding, according to formula Corr_Power _ncs=|| Corr_Result _ncs|| ²the performance number that record is relevant;

Wherein, Corr_Power _ncsfor relevant performance number, Corr_Result _ncsand Corr_Power _ncscorresponding with used cyclic shift value.

9. channel estimation methods according to claim 6, it is characterized in that, the RS sequence after the described RS cyclic shift corresponding for each cyclic shift value, respectively with 1.4M bandwidth, extract the RS group of target RB, the new RS sequence obtaining each cyclic shift value corresponding comprises:

For the RS sequence after the RS cyclic shift that each cyclic shift value is corresponding, in the middle of extracting, the RS of 6 RB, forms new RS sequence.

10. a terminal, is characterized in that, comprising:

Cell information acquisition module, for 1.4M bandwidth, available frequency obtains cell ID and timing information;

Sequence generating module, for 20M bandwidth, generates the reference signal RS sequence of 100 Resource Block RB; Wherein, a corresponding one group of RS of RB, one group of RS has multiple RS;

Traversal circular shift module, for determining the scope of cyclic shift value, for each cyclic shift value in described scope, successively with each cyclic shift value, the RS of each RB is moved in the RB corresponding with cyclic shift value, obtains the RS sequence after RS cyclic shift corresponding to each cyclic shift value; Wherein, the ordinal number of ordinal sum first RB of last RB circulates mutually;

New RS retrieval module, for for the RS sequence after RS cyclic shift corresponding to each cyclic shift value, respectively with 1.4M bandwidth, extracts the RS group of target RB, obtains the new RS sequence that each cyclic shift value is corresponding;

Be correlated with and performance number logging modle, for by new RS sequence corresponding for each cyclic shift value, carry out relevant to the RS sequence of the corresponding time-frequency location of the subframe of Received signal strength, and record the relevant performance number of each new RS sequence;

Cyclic shift value determination module, for the cyclic shift value that maximum power value in the performance number of each new RS sequence being correlated with is corresponding, is defined as the cyclic shift value of base station configuration;

Channel demodulation module, for the cyclic shift value configured according to determined base station, in the system bandwidth of 1.4M, with described cell ID and timing information demodulation PBCH, obtains demodulation gained information;

System information demodulation module, for system bandwidth is switched to actual bandwidth, utilizes described demodulation gained demodulates information system information, obtains channel-estimation information.