CN102202027A - Method and device for generating pilot frequency sequence - Google Patents

Abstract

The invention discloses a method for generating a pilot frequency sequence. The method comprises the following steps of: selecting OCCs (Orthogonal Cover Code) from an OCC set according to different rules in each code division and frequency division and/or time division hybrid multiplexing demodulation reference signal (DMRS) port by using different code division multiplexing groups and/or generating scrambling sequences of the DMRS according to different rules by using different code division multiplexing groups; and multiplying the selected OCCs with the scrambling sequences to generate a final pilot frequency sequence of each DMRS port. The invention further discloses a device for generating a pilot frequency sequence. By adopting the method and the device, corresponding layers among different code division multiplexing port groups can be lowered, the influence of inter-carrier interference caused by the problems of Doppler frequency shift and timing error on channel estimation is reduced, and the channel estimation accuracy is increased.

Description

A kind of production method of pilot frequency sequence and device

Technical field

The present invention relates to the inter-carrier interference treatment technology of wireless communication field, relate in particular to a kind of production method and device of pilot frequency sequence.

Background technology

The high-order multi-antenna technology is one of key technology of senior Long Term Evolution (LTE-A, Long Term Evolution Advanced) system, in order to improve system transmissions speed.In order to realize introducing channel quality measurement and the data demodulates behind the high-order multi-antenna technology, the LTE-A system has defined two class frequency pilot signs respectively: data demodulates pilot tone (DMRS, Demodulation Reference Signal) and channel quality measurement pilot tone (CSI-RS, Channel State Information-Reference Signal).Wherein, DMRS is the reference symbol that is used for Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel) demodulation, is called for short demodulation reference mark; CSI-RS is used for channel condition information (CSI, Channel State Information) reference symbol of Ce Lianging, be called for short the witness mark symbol, be used for channel quality indication (CQI, Channel QualityIndicator), pre-coding matrix indication (PMI, Precoding Matrix Indicator), stratum's indication information such as (RI, Rank Indicator) reports.The structure of this two classes reference symbol can be used for the new technical feature of support as LTE-A such as multipoint cooperative (CoMP, Coordinated Multi-Point), spatial reuses.

In the LTE system, adopt common reference symbol (CRS, Common Reference Signal) carries out pilot measurement, promptly all users use public guide frequency to carry out channel estimating, this public reference signal need transmitting terminal additionally notified receiving terminal to the emission The data which kind of pretreatment mode, pilot-frequency expense is bigger.In addition, in multi-user's multiple-input and multiple-output (MU-MIMO, Multiuser Multiple-InputMultiple-Output) technology,, can't realize the quadrature of pilot tone, therefore be unable to estimate interference because a plurality of UE uses identical CRS.

In the LTE-A system, in order to reduce the expense of pilot tone, with witness mark symbol and demodulation reference mark ++ separately design, the pretreatment mode that demodulation reference mark is identical with The data, demodulation reference mark is according to available order (rank) the information mapping reference symbol of dispatched users respective channels simultaneously, thereby can adaptively adjust expense, under the lower situation of order, can reduce expense greatly like this according to order information.

The detail of design of the demodulation reference mark of determining among the LTE-A, as shown in Figure 1, 2, 3, Fig. 1 is the DMRS pattern schematic diagram of corresponding normal sub-frames, Fig. 2 is that corresponding descending pilot frequency time slot is the DMRS pattern schematic diagram of 11 or 12 OFDM symbol, and Fig. 3 is that corresponding descending pilot frequency time slot is the DMRS pattern schematic diagram of 9 or 10 OFDM symbol.Dash area among the figure

Expression CRS, shown in the horizontal representative time domain of DMRS pattern, vertically represent frequency domain.When the employed rank number of descending transmission is less than or equal to 2, only use dash area

Shown Resource Unit (RE, Resources Element) is used for the transmission of DMRS, and employing length is 2 quadrature mask (OCC, Orthogonal Cover Code) on time domain, carries out scrambling on adjacent two OFDMs (OFDM, Orthogonal Frequency Division Multiplexing) symbol.When the rank number more than or equal to 3 and when being less than or equal to 4, use two groups of RE, respectively as dash area

With Shown in, wherein every group of RE goes up maximum orthogonalizable code to divide the DMRS number of plies of multiplexing (CDM, CodeDivision Multiplexing) is 2, and every group of RE adopts length on two adjacent on time domain OFDM symbols be that 2 OCC carries out the quadrature scrambling.And when the rank number greater than 4 the time, use two groups of RE, respectively as dash area

With

Shown in, every group of RE adopts length on the time domain direction be that 4 OCC carries out the quadrature scrambling, but and every group of RE DMRS number of plies of going up maximum quadrature CDM be 4.

Based on the DMRS pattern shown in Fig. 1,2,3, under hybrid multiplex DMRS mode, as based on CDM and frequency division multiplexing (FDM, Frequency Division Multiplexing) and/or time division multiplexing (TDM, Time Division Multiplexing) under the hybrid multiplex DMRS mode, if there is the problem of Doppler frequency shift and timing error, then can produce inter-carrier interference.Be analyzed as follows:

Under the DMRS multiplex mode based on CDM and FDM/TDM hybrid multiplex, between each different DMRS port, the demodulation reference mark of part DMRS port adopts the mode of CDM, and adopts the mode of FDM/TDM between the part DMRS port.Shown in the DMRS pattern as shown in Figure 1, 2, 3.Dash area

The corresponding group code of shown RE is divided multiplexing DMRS port, dash area

The corresponding other one group of RE that carries out code division multiplexing of shown RE.

Prior art is when producing the DMRS pilot frequency sequence, and two groups of DMRS at first produce scramble sequence r (m) according to identical mode, that is:

$r\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),m=\mathrm{0,1},...,{12N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1---\left(1\right)$

Wherein, N _RB ^{Max, DL}Resource Block (RB, the Resource Block) number of expression downlink system bandwidth correspondence.Pseudo random sequence c (i) produces according to the mode of 7.2 joint definition in the existing standard 36.211, is specially:

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2 (2)

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2

Wherein, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂(i) can calculate by following two formulas:

$c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i---\left(4\right)$

In the following formula, n _SCIDExpression scrambler sequence ID, value is 0 or 1, default situations is 0; Mod represents modulo operation, N _ID ^CellThe ID of expression UE sub-district of living in, n _sRepresent current subframe sequence number, c _InitBe used for initialization x ₂Intermediate variable.

When normal cyclic prefix, according to scheduled user's resource location, the corresponding length of intercepting r from scramble sequence r (m), and with the OCC generation pilot frequency sequence that multiplies each other with it, be shown below:

$s^p\&CenterDot;r(3\&CenterDot;l^{\&prime;}\&CenterDot;N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\&CenterDot;n_{\mathrm{PRB}}+m^{\&prime;})---\left(5\right)$

Wherein, s ^pThe generation formula of the OCC of corresponding DMRS port p, n _PRBThe expression Physical Resource Block is at the index of frequency domain; L ' and m ' are used to indicate the position of the sequence of intercepting, are determined by the configuration relation of frame structure.

According to the pattern of DMRS, when the different layers number, the length difference of OCC, when the number of plies was 3～4, OCC length was 2; When the number of plies was 5～8, OCC length was 4.This shows that prior art is carried out corresponding identical sequence r (3l ' N of the scrambler of respectively organizing the DMRS port of code division multiplexing in the process that produces pilot frequency sequence _RB ^{Max, DL}+ 3n _PRB+ m '), and by each different OCC that organize DMRS port correspondence produce the pilot frequency sequence that each group code is divided multiplexing DMRS port correspondence.

When with OCC during, respectively organize the direction (on resource corresponding on the time domain direction, carry out code division multiplexing or on the resource of frequency domain direction correspondence, carry out code division multiplexing) that port carries out code division multiplexing according to DMRS and determine s the sequence scrambling ^pValue on each resource.Equaling 4 with OCC length among the LTE-A is example, and hypothesis DMRS corresponding port is respectively p ∈ { 7～14}, in the subframe of normal cyclic prefix, to the pilot frequency sequence form of each DMRS port on l OFDM symbol, a k sub-carrier positions be through OCC processing back:

$a_{k,l}^{\left(p\right)}=s^p\&CenterDot;r(3\&CenterDot;l^{\&prime;}\&CenterDot;N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\&CenterDot;n_{\mathrm{PRB}}+m^{\&prime;})---\left(6\right)$

$k=\left\{\begin{array}{cc}5\&CenterDot;m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}\&CenterDot;n_{\mathrm{PRB}}+1& P=\mathrm{7,8,11},\mathrm{or}13\\ 5\&CenterDot;m^{\&prime;}+N_{\mathrm{sc}}^{\mathrm{RB}}\&CenterDot;n_{\mathrm{PRB}}& p=\mathrm{9,10,12},\mathrm{or}14\end{array}\right.$

In the following formula, l=l ' mod2+5

$l^{\&prime;}=\left\{\begin{array}{cc}\mathrm{0,1}& \mathrm{if}{n}_s\mathrm{mod}2=0\\ \mathrm{2,3}& \mathrm{if}{n}_s\mathrm{mod}2=1\end{array}\right.$

m′＝0，1，2

Wherein, N _Sc ^RBBe illustrated in subcarrier number that RB comprises on the frequency domain direction, n _PRBExpression corresponding physical Resource Block is at the index of frequency domain, n _sExpression time slot sequence number.When considering special subframe, l can be configured to

Following value:

m′＝0，1，2

When sequence being handled, must consider the position relation of DMRS sequence and code division multiplexing resource, so OCC is during to the sequence computing, with it correspondence with OCC.For example: OCC[1 11 1] corresponding DMRS port 7, then s ⁷=1; And OCC[1-1 1 1] corresponding DMRS port 8, and port 8 on the time domain direction with other multiplexed ports of its place group, then s ⁸Can be expressed as $s^8={(-1)}^{m^{\&prime;}+l^{\&prime;}+n_{\mathrm{PRB}}}.$ Here just to explanation s ^pWith the corresponding relation of OCC, in actual applications, can be according to the corresponding relation of OCC and antenna port, and, s is shown with corresponding formula table based on the pattern mapping relations under the hybrid multiplex mode ^pFormulate on corresponding resource location.

Shown in Fig. 1,2,3, when existing two group codes to divide multiplexing DMRS port, and at two groups of ports dash area in the corresponding diagram 1,2,3 respectively

With

Shown under the situation of resource, if having Doppler frequency deviation or timing error in the system, then can produce between the carrier wave and disturb, shown in Fig. 4 (a), 4 (b), the carrier wave schematic diagram of Fig. 4 (a) during for no Doppler frequency deviation or timing error; Fig. 4 (b) is the inter-carrier interference schematic diagram when having Doppler frequency deviation.

For example: with the resource location that the DMRS port of the code division multiplexing shown in Fig. 1,2,3 is shone upon, the DMRS port { P of first code division multiplexing group _1,0, P _1,1, P _1,2, P _1,3Corresponding OCC is followed successively by OCC ₀, OCC ₁, OCC ₂, OCC ₃, and the DMRS port { P of second code division multiplexing group _2,0, P _2,1, P _2,2, P _2,3According to identical selective sequential OCC.Suppose that the leaky factor between the adjacent carrier is β owing to the existence of Doppler frequency shift or timing error, equaling 5 with total number of layers is example, for convenience simultaneously, and definition { P _1,0, P _1,1, P _1,2, P _1,3The corresponding port of difference { 78 11 13}, { P _2,0, P _2,1, P _2,2, P _2,3The corresponding port of difference { 9 10 12 14}.

First group of resource is (as dash area

Shown in the position) multiplexing port is 7,8; Second group of resource is (as dash area

Shown in the position) multiplexing port is 9,10,12.The channel coefficients of establishing port 7,8,9,10,12 correspondences simultaneously is respectively: H ₇, H ₈, H ₉, H ₁₀And H ₁₂, the corresponding sequence intercepting that is located on two groups of RE is r _cWith port 7 is example, if adopt identical OCC between two groups of RE,

${\mathrm{<figure-callout\; id="7"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^7\&LeftRightArrow;{\mathrm{OCC}}_0$ $s^8\&LeftRightArrow;{\mathrm{OCC}}_1$

${\mathrm{<figure-callout\; id="9"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^9\&LeftRightArrow;{\mathrm{OCC}}_0$ $s^{10}\&LeftRightArrow;{\mathrm{OCC}}_1$ ${\mathrm{<figure-callout\; id="11"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^{11}\&LeftRightArrow;{\mathrm{OCC}}_2$

OCC wherein _iAnd OCC _jQuadrature, i ≠ j.When intercarrier exist to disturb (being example with the situation of two carrier waves only here), the signal that port 7 receives is:

H ₇s ⁷r _c+H ₈s ⁸r _c+β·(H ₉s ⁹r _c+H ₁₀s ¹⁰r _c+H ₁₂s ¹²r _c)

Remove the sequence r of pilot tone _cAfter, be H ₇s ⁷+ H ₈s ⁸+ β (H ₉s ⁹+ H ₁₀s ¹⁰+ H ₁₂s ¹²), use s afterwards ⁷Corresponding OCC OCC ₀When carrying out despreading, because OCC _iAnd OCC _jQuadrature estimates that the channel coefficients that obtains will be H ₇+ β H ₉, β H wherein ₉Part is interference.

Based on above-mentioned analysis, how to reduce the influence of inter-carrier interference to channel estimating, prior art also can't provide effective solution.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of production method and device of pilot frequency sequence, and to be reduced under the hybrid multiplex DMRS mode, inter-carrier interference is to the influence of channel estimating.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides a kind of production method of pilot frequency sequence, this method comprises:

Carry out in demodulation reference mark (DMRS) port of yard branch and frequency division and/or time division mixed multiplexing at each, for different code division multiplexing groups is selected OCC according to different criterions from quadrature mask (OCC) set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence;

Selected OCC and scramble sequence multiplied each other produce the final pilot frequency sequence of each DMRS port.

Described is that different code division multiplexing groups is selected OCC according to different criterions from the OCC set, is specially:

Described different code division multiplexing group is gathered [OCC according to opposite order from OCC ₀..., OCC _K-1] the middle OCC that selects, wherein k represents the number of OCC in the OCC set, k is the integer greater than 1.

Described is that different code division multiplexing groups is selected OCC according to different criterions from the OCC set, is specially:

In the described different code division multiplexing group, have only part of O CC from the OCC set, to select according to opposite order, specifically comprise: in two different code division multiplexing groups, M OCC before preceding M DMRS port selected from the OCC set according to identical order, back N DMRS port selected N the OCC in back according to opposite order from the OCC set, wherein, M+N is a maximum reusable DMRS port number in each code division multiplexing group.

Described is that different code division multiplexing groups is selected OCC according to different criterions from the OCC set, is specially:

For being provided with the different original positions of choosing respectively, described different code division multiplexing group is offset δ _i, each code division multiplexing group is from the δ of self correspondence _iBeginning is according to step-length λ _{Step_i}Selective sequential OCC, wherein, i represents the sequence number of code division multiplexing group, δ _iAnd λ _{Step_i}Be integer, and 0≤δ _i＜k, 1≤λ _{Step_i}＜k.

Described n DMRS port for i code division multiplexing group, the index of its pairing OCC is chosen in such a way: (δ _i+ n λ _{Step_i}+ α) mod k,

Wherein, mod is a modulo operation, works as λ _{Step_i}During for odd number, the value of α is 0; Work as λ _{Step_i}During for even number,

Described to be different code division multiplexing group produce the scramble sequence of DMRS according to different criterions, is specially:

Described different code division multiplexing group adopts different initialization modes to produce the scramble sequence of DMRS, when two group codes are divided multiplexing group, first group according to

Initialization mode produce the scramble sequence of DMRS, wherein acquiescence

Or 1; Second group according to

Initialization mode produce the scramble sequence of DMRS.

Described selected OCC and scramble sequence are multiplied each other produces the final pilot frequency sequence of each DMRS port, is specially:

When the OCC that will select and scramble sequence multiplied each other, on the adjacent DMRS carrier wave, the OCC of each DMRS port correspondence oppositely shone upon.

Described selected OCC and scramble sequence are multiplied each other produces the final pilot frequency sequence of each DMRS port, is specially:

Corresponding different code division multiplexing group i when OCC shines upon, adopts similar and different original position δ _{Occ_i}Skew, wherein 0≤δ _{Occ_i}＜L-1, L represent the length of OCC.

Described δ _{Occ_i}Value be mod (SubcarierIndex+ ε _i,, L), wherein, SubcarierIndex represents sub-carrier indices, L represents the length of each OCC.

The present invention also provides a kind of generation device of pilot frequency sequence, and this device comprises:

Select module, be used for carrying out the DMRS port of yard branch and frequency division and/or time division mixed multiplexing at each, for different code division multiplexing groups is selected OCC according to different criterions from the OCC set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence;

The pilot frequency sequence generation module, being used for selected OCC and scramble sequence multiplied each other produces the final pilot frequency sequence of each DMRS port.

Described selection module is further used for, and different code division multiplexing groups is gathered [OCC according to opposite order from OCC ₀..., OCC _K-1] the middle OCC that selects, wherein k represents the number of OCC in the OCC set, k is the integer greater than 1.

Described selection module is further used for, and in different code division multiplexing groups, only part of O CC is selected from the OCC set according to opposite order.

Described selection module is further used for, and is offset δ for described different code division multiplexing group is provided with the different original positions of choosing respectively _i, each code division multiplexing group is from the δ of self correspondence _iBeginning is according to step-length λ _{Step_i}Selective sequential OCC, wherein, i represents the sequence number of code division multiplexing group, δ _iAnd λ _{Step_i}Be integer, and 0≤δ _i＜k, 1≤λ _{Step_i}＜k.

Described selection module is further used for, and for n DMRS port of i code division multiplexing group, chooses the index of its pairing OCC in such a way: (δ _i+ n λ _{Step_i}+ α) mod k,

Wherein, mod is a modulo operation, works as λ _{Step_i}During for odd number, the value of α is 0; Work as λ _{Setp_i}During for even number,

Described selection module is further used for, and adopts different initialization modes to produce the scramble sequence of DMRS to different code division multiplexing group, when two group codes are divided multiplexing group, first group according to

Initialization mode produce the scramble sequence of DMRS, wherein acquiescence

Or 1; Second group according to Initialization mode produce the scramble sequence of DMRS.

Described pilot frequency sequence generation module is further used for, when the OCC that will select and scramble sequence multiply each other, on the adjacent DMRS carrier wave, for the OCC of each DMRS port correspondence oppositely shines upon.

Described pilot frequency sequence generation module is further used for, and corresponding different code division multiplexing group i when OCC shines upon, adopts similar and different original position δ _{Occ_i}Skew, wherein 0≤λ _{Occ_i}＜L-1, L represent the length of OCC.

Described δ _{Occ_i}Value be mod (SubcarierIndex+ ε _i, L), wherein, SubcarierIndex represents sub-carrier indices, L represents the length of each OCC.

The production method of a kind of pilot frequency sequence provided by the present invention and device, carry out in the DMRS port of code division multiplexing at each, for different sign indicating number branches is selected OCC according to different criterions with frequency division and/or time division mixed multiplexing group from the OCC set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence; Selected OCC and scramble sequence multiplied each other produce the final pilot frequency sequence of each DMRS port.By the present invention, when two groups of OCC quadratures that use, and exist under the situation of Doppler frequency deviation or timing error, by the OCC despreading, can reduce between subcarrier and disturb, thereby improve channel estimated accuracy the locational influence of demodulation pilot frequency reference symbol; And, under the OCC condition of limited, can guarantee the OCC quadrature between two groups, thereby under the OCC condition of limited, reduce influence to channel estimating by processing mode of the present invention as far as possible.

Description of drawings

Fig. 1 is the detail of design schematic diagram one of DMRS in the prior art;

Fig. 2 is the detail of design schematic diagram two of DMRS in the prior art;

Fig. 3 is the detail of design schematic diagram three of DMRS in the prior art;

Fig. 4 (a) is the carrier wave schematic diagram when no Doppler frequency deviation or timing error in the prior art;

Fig. 4 (b) is the inter-carrier interference schematic diagram when having Doppler frequency deviation in the prior art;

Fig. 5 is the flow chart of the production method of a kind of pilot frequency sequence of the present invention;

Fig. 6 is the OCC method of salary distribution schematic diagram of the embodiment of the invention one;

Fig. 7 is the OCC method of salary distribution schematic diagram of the embodiment of the invention two;

Fig. 8 is the OCC method of salary distribution schematic diagram of the embodiment of the invention three;

Fig. 9 is the OCC method of salary distribution schematic diagram of the embodiment of the invention four.

Embodiment

The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.

The production method of a kind of pilot frequency sequence provided by the present invention as shown in Figure 5, mainly may further comprise the steps:

Step 501, carry out in the DMRS port of code division multiplexing at each, for different sign indicating number branches is selected OCC according to different criterions with frequency division and/or time division mixed multiplexing group from the OCC set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence.

Wherein, different code division multiplexing groups can be according to opposite order from OCC set [OCC ₀..., OCC _K-1] the middle OCC that selects, k represents the number of OCC in the OCC set, k is the integer greater than 1.Describe for example below: from the OCC set, select OCC according to opposite order between two code division multiplexing groups, first code division multiplexing group selects the order of OCC to be from the OCC set: according to the order of DMRS port in first code division multiplexing group, selective sequential OCC is corresponding with each port from the OCC set, promptly $s^{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{1,0}}}\&LeftRightArrow;{\mathrm{OCC}}_0,$ $s^{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">\; <figure-callout\; id="1"\; label="p"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">p</figure-callout>\; </figure-callout>}}_{\mathrm{1,1}}}\&LeftRightArrow;{\mathrm{<figure-callout\; id="1"\; label="OCC"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">OCC</figure-callout>}}_1,$ $s^{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{1,2}}}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{1,3}}}\&LeftRightArrow;{\mathrm{OCC}}_3;$ Second code division multiplexing group selects the order of OCC to be from the OCC set: according to the order of DMRS port in second code division multiplexing group, backward selects OCC corresponding with each port from the OCC set, promptly $s^{p_{\mathrm{2,0}}}\&LeftRightArrow;{\mathrm{OCC}}_3,$ $s^{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{2,1}}}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{p_{\mathrm{2,2}}}\&LeftRightArrow;{\mathrm{<figure-callout\; id="1"\; label="OCC"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">OCC</figure-callout>}}_1,$ $s^{p_{\mathrm{2,3}}}\&LeftRightArrow;{\mathrm{OCC}}_0.$ Wherein, p _{I, j}J DMRS port among the expression code division multiplexing group i.

For easy analysis, in the following examples with { P _1,0, P _1,1, P _1,2, P _1,3The corresponding port of difference { 78 11 13}, { P _2,0, P _2,1, P _2,2, P _2,3The corresponding port of difference 9 10 12 14} are example, what deserves to be explained is, when practical application, also can be defined as other forms, for example: when being 8 DMRS ports to the maximum, definition DMRS port sequence number { 0～7}, { P _1,0, P _1,1, P _1,2, P _1,3The corresponding port of difference { 014 6}, { P _2,0, P _2,1, P _2,2, P _2,3The corresponding port of difference { 235 7}.

Based on above-mentioned port corresponded manner, be 5 o'clock in number of layers, if the OCC that selects in first code division multiplexing group is: $s^7\&LeftRightArrow;{\mathrm{OCC}}_0,$ $s^8\&LeftRightArrow;{\mathrm{OCC}}_1,$ Then the OCC that selects in second code division multiplexing group is: $s^9\&LeftRightArrow;{\mathrm{OCC}}_3,$ $s^{10}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{11}\&LeftRightArrow;{\mathrm{OCC}}_1,$ This moment is because DMRS port 7 used OCC (are OCC ₀) with second code division multiplexing group in the OCC of each port all inequality, therefore when using OCC ₀When carrying out despreading, the RE of second code division multiplexing group correspondence upward reveals the interference of coming and will eliminate fully.When maximum is supported 8 layers, and the mapping of each DMRS port is when adopting the hybrid multiplex mode of CDM+FDM, the concrete OCC method of salary distribution as shown in Figure 6, promptly the OCC that selects in first code division multiplexing group is: $s^7\&LeftRightArrow;{\mathrm{OCC}}_0,$ $s^8\&LeftRightArrow;{\mathrm{OCC}}_1,$ $s^{11}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{13}\&LeftRightArrow;{\mathrm{OCC}}_3;$ The OCC that selects in second code division multiplexing group is: $s^9\&LeftRightArrow;{\mathrm{OCC}}_3,$ $s^{10}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{12}\&LeftRightArrow;{\mathrm{OCC}}_1,$ $s^{14}\&LeftRightArrow;{\mathrm{OCC}}_0.$ Need to prove that the DMRS port among the present invention is not limited only to { select among 7～14} at p ∈.

In addition, the present invention also can be provided with the different original positions of choosing for different code division multiplexing groups respectively and be offset δ _i, each code division multiplexing group is from the δ of self correspondence _iBeginning is according to step-length λ _{Step_i}Selective sequential OCC, wherein, i represents the sequence number of code division multiplexing group, δ _iAnd λ _{Step_i}Be integer, and 0≤δ _i＜k, 1≤λ _{Step_i}＜k.For n DMRS port of i code division multiplexing group, the index of its pairing OCC is chosen in such a way: (δ _i+ n λ _{Step_i}+ α) mod k, wherein, mod is a modulo operation, works as λ _{Step_i}During for odd number, the value of α is 0; Work as λ _{Step_i}During for even number, Describe for example below: between two code division multiplexing groups different original position skew δ is set ₀And δ ₁, and according to step-length λ _{Step_i}Choose OCC.With δ ₀=0, δ ₁=1, λ _{Step_0}=λ _{Step_1}=1 is example, that is:

${\mathrm{<figure-callout\; id="7"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^7\&LeftRightArrow;{\mathrm{OCC}}_0$ ${\mathrm{<figure-callout\; id="8"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^8\&LeftRightArrow;{\mathrm{<figure-callout\; id="1"\; label="OCC"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">OCC</figure-callout>}}_1$

${\mathrm{<figure-callout\; id="9"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^9\&LeftRightArrow;{\mathrm{OCC}}_1$ $s^{10}\&LeftRightArrow;{\mathrm{OCC}}_2$ $s^{11}\&LeftRightArrow;{\mathrm{OCC}}_3$

When selecting OCC according to above-mentioned given side-play amount and step-length, when the hybrid multiplex mode of CDM+FDM was adopted in the mapping of 8 layers of maximum supports and each port DMRS, concrete OCC selected as shown in Figure 7, and promptly the OCC that selects in first code division multiplexing group is: $s^7\&LeftRightArrow;{\mathrm{OCC}}_0,$ ${\mathrm{<figure-callout\; id="8"\; label="s"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">s</figure-callout>}}^8\&LeftRightArrow;{\mathrm{<figure-callout\; id="1"\; label="OCC"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">OCC</figure-callout>}}_1,$ $s^{11}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{12}\&LeftRightArrow;{\mathrm{OCC}}_3;$ The OCC that selects in second code division multiplexing group is: $s^9\&LeftRightArrow;{\mathrm{<figure-callout\; id="1"\; label="OCC"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">OCC</figure-callout>}}_1,$ $s^{10}\&LeftRightArrow;{\mathrm{OCC}}_2,$ $s^{12}\&LeftRightArrow;{\mathrm{OCC}}_3,$ $s^{14}\&LeftRightArrow;{\mathrm{OCC}}_0.$ At this moment, when using s ⁷Corresponding OCC OCC ₀To H ₇s ⁷+ H ₈s ⁸+ β (H ₉s ⁹+ H ₁₀s ¹⁰+ H ₁₂s ¹²) when carrying out despreading, because therefore the equal quadrature of OCC of port 8,9,10,12 OCC that adopted and port 7 can accurately recover channel coefficients H ₇

Have again, consider and the compatibility of low-rank situation, under low-rank (rank is 1～4) situation, in the different code division multiplexing groups, can have only part of O CC from the OCC set, to select according to opposite order.In two different code division multiplexing groups, M OCC before preceding M DMRS port selected from the OCC set according to identical order, back N DMRS port selected N the OCC in back according to opposite order from the OCC set, wherein, M+N is a maximum reusable DMRS port number in each code division multiplexing group, preferred L=N.For example: when in two code division multiplexing groups, distributing OCC, part in the OCC set oppositely can be distributed, be easy analysis, be { 7 811 13} still with the corresponding DMRS port of first code division multiplexing group, second corresponding DMRS port of code division multiplexing group is for { 9 10 12 14} are example, for each port of first code division multiplexing group can be chosen OCC respectively in order ₀, OCC ₁, OCC ₂, OCC ₃, and to each port of second code division multiplexing group, only the part in the OCC set is oppositely chosen, be that the order of each DMRS port of second code division multiplexing group is assigned as OCC respectively ₀, OCC ₁, OCC ₃, OCC ₂The concrete OCC method of salary distribution as shown in Figure 8.

Produce the part of the scramble sequence of DMRS for different code division multiplexing groups according to different criterion, different code division multiplexing groups can adopt different initialization modes to produce the scramble sequence of DMRS, when two group codes are divided multiplexing group, first group according to

Initialization mode produce the scramble sequence of DMRS, wherein acquiescence

Or 1; Second group according to

Initialization mode produce the scramble sequence of DMRS, according to c _InitThe process that produces scramble sequence is identical with the background technology mode.So when adopting different sequences, owing to be semi-orthogonal between the sequence, this moment is (being example with the situation of two carrier waves only) here when intercarrier existence interference, and the signal that port 7 receives is:

H ₇s ⁷r _c1+H ₈s ⁸r _c1+β·(H ₉s ⁹r _c2+H ₁₀s ¹⁰r _c2+H ₁₂s ¹²r _c2)

Remove the sequence r of pilot tone _C1After, be H ₇s ⁷+ H ₈s ⁸+ β (H ₉s ⁹r _C2+ H ₁₀s ¹⁰r _C2+ H ₁₂s ¹²r _C2) conj (r _C1), wherein, conj (x) expression is got conjugation respectively to the element among the sequence x, uses s afterwards ⁷Corresponding OCC OCC ₀When carrying out despreading, the length of establishing OCC is k, after the despreading is ${\mathrm{<figure-callout\; id="7"\; label="H"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">H</figure-callout>}}_7+\frac{\mathrm{\&beta;}\&CenterDot;({\mathrm{<figure-callout\; id="9"\; label="H"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">H</figure-callout>}}_9+{\mathrm{<figure-callout\; id="10"\; label="H"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">H</figure-callout>}}_{10}+H_{12})}{k}.$ As can be seen, disturb and be

Because H ₉, H ₁₀, H ₁₂Be pseudo random number, so the interference β H compared to existing technology ₉Little.

Step 502, selected OCC and scramble sequence multiplied each other produces the final pilot frequency sequence of each DMRS port.

In the OCC selection mode that each embodiment provides in step 501, the power difference on the different OFDM symbols, on adjacent DMRS carrier wave, the OCC of each DMRS port correspondence of same code division multiplexing group can carry out oppositely or circulation skew mapping.Here on adjacent carrier, being that example describes according to the circulate mode of skew mapping of the OCC of each DMRS port correspondence.Selection mode for other OCC is suitable equally.

Suppose that the OCC that adopts between the layer of same code division multiplexing group is respectively OCC ₀: [1 11 1], OCC ₁: [1-1 1-1], OCC ₂: [1-1-1 1], OCC ₃: [1 1-1-1].On adjacent DMRS subcarrier, used scramble sequence is respectively s _{I, 0}, s _{I, 1}, s _{I, 2}, s _{I, 3}And s _I+1,0, s _I+1,1, s _I+1,2, s _I+1,3, and suppose that the precoding weights on this PRB are $w=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& 1& -1& -1\\ 1& -1& 1& -1\\ 1& -1& -1& 1\end{array}\right],$ After the OCC processing, the pilot signal on the different OFDM symbols of same carrier wave correspondence is expressed as $\left[\begin{array}{cccc}{s}_{i,0}& s_{i,1}& s_{i,2}& s_{i,3}\\ s_{i,0}& {-s}_{i,1}& s_{i,2}& -s_{i,3}\\ s_{i,0}& -s_{i,1}& -s_{i,2}& s_{i,3}\\ s_{i,0}& s_{i,1}& {-s}_{i,2}& -s_{i,3}\end{array}\right].$

When OCC not carried out oppositely or being offset mapping, different OFDM symbols the transmitting on each antenna port of same DMRS carrier wave correspondence is respectively:

As seen for any one port, the power that appears on certain DMRS OFDM symbol increases, and the power on other DMRS OFDM symbols reduces even do not have signal to send problem.Equally, on adjacent carrier wave,, identical on other the carrier wave with top form if there is not the reverse mapping of OCC Because for a certain port, for example the DMRS port 0, power maximum (port 0 corresponding DMRS OFDM symbol 1) on certain DMRS OFDM symbol always, and on other symbols, do not have signal, thus cause the power difference of different DMRS OFDM symbols.Because code division multiplexing group 2 adopts the identical OCC method of salary distribution, and is therefore identical with the situation of code division multiplexing group 1.

The present invention is by oppositely shining upon or δ OCC _{Occ_i}The skew mapping, and, can reduce the influence of inter-carrier interference to channel estimating in conjunction with adopting different OCC to distribute in the different code division multiplexing groups.The original position skew δ here _{Occ_i}Be meant that at each length in the OCC set be the OCC of L, the skew δ that this OCC is carried out _{Occ_i}, concrete offset manner can be described with reference to following embodiment.

Because usually, the precoding weights difference that the corresponding DMRS port of each code division multiplexing group adopts therefore can be with the effect of reverse mapping of a code division multiplexing group profile or circulation skew mapping.In the practical application, the mode that can obtain the reverse mapping or the circulation skew mapping of second code division multiplexing group according to identical form according to the reverse mapping or the circulation skew mapping mode of first code division multiplexing group.Need to prove that under several OCC selection modes of Miao Shuing, this mapping mode all is suitable in front.In the following embodiments, the mode with the circulation skew is that example describes.

When adopting δ _{Occ_i}During the circulation skew, corresponding different code division multiplexing group i when OCC shines upon, adopts similar and different original position δ _{Occ_i}Skew, wherein 0≤δ _{Occ_i}＜L-1, L represent the length of OCC.Original position δ herein _{Occ_i}Be meant that at each length in the OCC set be the OCC of L, the skew δ that this OCC is carried out _{Occ_i}A kind of δ _{Occ_i}Value mode be δ _{Occ_i}=mod (SubcarierIndex+ ε _i, L), wherein SubcarierIndex represents sub-carrier indices, L represents the length of each OCC.ε _iCan with ε _jGet identical value or different values, ε _i, ε _jRepresent the relative displacement between the different code division multiplexing groups.For convenience of description, here only with ε _i=ε _jFor example describes.

For certain code division multiplexing group, on adjacent DMRS subcarrier, used scramble sequence is still respectively with s _{I, 0}, s _{I, 1}, s _{I, 2}, s _{I, 3}And s _I+1,0, s _I+1,1, s _I+1,2, s _I+1,3Be example.Mapping mode on the DMRS carrier wave of i this code division multiplexing group correspondence is The time, then the mapping mode on the DMRS carrier wave of i+1 this code division multiplexing group correspondence is

If $\left(\begin{array}{c}{\mathrm{OCC}}_0\\ {\mathrm{<figure-callout\; id="1"\; label="OCC"\; filenames="HSA00000047891600041.png,HSA00000047891600051.png"\; state="\{\{state\}\}">OCC</figure-callout>}}_1\\ {\mathrm{OCC}}_2\\ {\mathrm{OCC}}_3\end{array}\right)=\left(\begin{array}{cccc}1& 1& 1& 1\\ 1& -1& 1& -1\\ 1& 1& -1& -1\\ 1& -1& -1& 1\end{array}\right)=\left(\begin{array}{cccc}a& b& c& d\end{array}\right).$ Then on above-mentioned i and i+1 DMRS carrier wave, the mapping of OCC corresponding each DMRS port on 4 OFDM symbols is respectively (a b c d) and (b c d a), in like manner, at i+3, on the i+4, the mapping of OCC corresponding each DMRS port on 4 OFDM symbols is respectively (c d a b) and (d a b c).

Suppose the precoding weights $w=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& 1& -1& -1\\ 1& -1& 1& -1\\ 1& -1& -1& 1\end{array}\right],$ Power on 4 adjacent carrier waves is respectively

As seen each DMRS port maximum occurs in each symbol cocycle, thereby avoids certain OFDM symbol transmitted power problems of too on certain symbol.

When being first code division multiplexing set of dispense OCC ₀, OCC ₁, OCC ₂, OCC ₃, and to second code division multiplexing set of dispense OCC ₀, OCC ₁, OCC ₃, OCC ₂The time, the corresponding method of salary distribution is as shown in Figure 9.

The production method of corresponding above-mentioned pilot frequency sequence, the present invention also provides a kind of generation device of pilot frequency sequence, comprising: select module and pilot frequency sequence generation module.Select module, be used for carrying out the DMRS port of yard branch and frequency division and/or time division mixed multiplexing at each, for different code division multiplexing groups is selected OCC according to different criterions from the OCC set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence.Concrete: select module to gather [OCC according to opposite order from OCC to different code division multiplexing groups ₀..., OCC _K-1] the middle OCC that selects; Under the low-rank situation, in the different code division multiplexing groups, also can only select from the OCC set according to opposite order part of O CC; Also, different code division multiplexing groups is offset δ for being provided with the different original positions of choosing respectively _i, each code division multiplexing group is from the δ of self correspondence _iBeginning is according to step-length λ _{Step_i}Selective sequential OCC; Can also adopt different initialization modes to produce the scramble sequence of DMRS to different code division multiplexing groups.

The pilot frequency sequence generation module, being used for selected OCC and scramble sequence multiplied each other produces the final pilot frequency sequence of each DMRS port.Concrete: as when the OCC that will select and scramble sequence multiply each other, on the adjacent DMRS carrier wave, can oppositely to shine upon for the OCC of each DMRS port correspondence; Perhaps, corresponding different code division multiplexing group i when OCC shines upon, adopts similar and different original position δ _{Occ_i}Skew, wherein 0≤δ _{Occ_i}＜L-1, L represent the length of OCC.

In sum, can reduce layer corresponding between the different CDM port set, reduce because the inter-carrier interference that Doppler frequency shift and timing error problem cause to the influence of channel estimating, improves channel estimated accuracy by the present invention.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (18)

1. the production method of a pilot frequency sequence is characterized in that, this method comprises:

Carry out in demodulation reference mark (DMRS) port of yard branch and frequency division and/or time division mixed multiplexing at each, for different code division multiplexing groups is selected OCC according to different criterions from quadrature mask (OCC) set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence;

Selected OCC and scramble sequence multiplied each other produce the final pilot frequency sequence of each DMRS port.

2. according to the production method of the described pilot frequency sequence of claim 1, it is characterized in that described is that different code division multiplexing groups is selected OCC according to different criterions from the OCC set, is specially:

Described different code division multiplexing group is gathered [OCC according to opposite order from OCC ₀..., OCC _K-1] the middle OCC that selects, wherein k represents the number of OCC in the OCC set, k is the integer greater than 1.

3. according to the production method of the described pilot frequency sequence of claim 1, it is characterized in that described is that different code division multiplexing groups is selected OCC according to different criterions from the OCC set, is specially:

In the described different code division multiplexing group, have only part of O CC from the OCC set, to select according to opposite order, specifically comprise: in two different code division multiplexing groups, M OCC before preceding M DMRS port selected from the OCC set according to identical order, back N DMRS port selected N the OCC in back according to opposite order from the OCC set, wherein, M+N is a maximum reusable DMRS port number in each code division multiplexing group.

4. according to the production method of the described pilot frequency sequence of claim 1, it is characterized in that described is that different code division multiplexing groups is selected OCC according to different criterions from the OCC set, is specially:

For being provided with the different original positions of choosing respectively, described different code division multiplexing group is offset δ _i, each code division multiplexing group is from the δ of self correspondence _iBeginning is according to step-length λ _{Step_i}Selective sequential OCC, wherein, i represents the sequence number of code division multiplexing group, δ _iAnd λ _{Step_i}Be integer, and 0≤δ _i＜k, 1≤λ _{Step_i}＜k.

5. according to the production method of the described pilot frequency sequence of claim 4, it is characterized in that, described n DMRS port for i code division multiplexing group, the index of its pairing OCC is chosen in such a way: (δ _i+ n λ _{Step_i}+ α) mod k,

Wherein, mod is a modulo operation, works as λ _{Step_i}During for odd number, the value of α is 0; Work as λ _{Step_i}During for even number,

6. according to the production method of the described pilot frequency sequence of claim 1, it is characterized in that described to be different code division multiplexing group produce the scramble sequence of DMRS according to different criterions, is specially:

Described different code division multiplexing group adopts different initialization modes to produce the scramble sequence of DMRS, when two group codes are divided multiplexing group, first group according to

Initialization mode produce the scramble sequence of DMRS, wherein acquiescence

Or 1; Second group according to

Initialization mode produce the scramble sequence of DMRS.

7. according to the production method of each described pilot frequency sequence of claim 1 to 6, it is characterized in that described selected OCC and scramble sequence are multiplied each other produces the final pilot frequency sequence of each DMRS port, is specially:

When the OCC that will select and scramble sequence multiplied each other, on the adjacent DMRS carrier wave, the OCC of each DMRS port correspondence oppositely shone upon.

8. according to the production method of each described pilot frequency sequence of claim 1 to 6, it is characterized in that described selected OCC and scramble sequence are multiplied each other produces the final pilot frequency sequence of each DMRS port, is specially:

Corresponding different code division multiplexing group i when OCC shines upon, adopts similar and different original position δ _{Occ_i}Skew, wherein 0≤δ _{Occ_i}＜L-1, L represent the length of OCC.

9. the production method of each described pilot frequency sequence according to Claim 8 is characterized in that described δ _{Occ_i}Value be mod (SubcarierIndex+ ε _i, L), wherein, SubcarierIndex represents sub-carrier indices, L represents the length of each OCC.

10. the generation device of a pilot frequency sequence is characterized in that, this device comprises:

Select module, be used for carrying out the DMRS port of yard branch and frequency division and/or time division mixed multiplexing at each, for different code division multiplexing groups is selected OCC according to different criterions from the OCC set, and/or be different code division multiplexing groups produces DMRS according to different criterions scramble sequence;

The pilot frequency sequence generation module, being used for selected OCC and scramble sequence multiplied each other produces the final pilot frequency sequence of each DMRS port.

11. the generation device according to the described pilot frequency sequence of claim 10 is characterized in that, described selection module is further used for, and different code division multiplexing groups is gathered [OCC according to opposite order from OCC ₀..., OCC _K-1] the middle OCC that selects, wherein k represents the number of OCC in the OCC set, k is the integer greater than 1.

12. the generation device according to the described pilot frequency sequence of claim 11 is characterized in that, described selection module is further used for, and in different code division multiplexing groups, only part of O CC is selected from the OCC set according to opposite order.

13. the generation device according to the described pilot frequency sequence of claim 10 is characterized in that, described selection module is further used for, and is offset δ for described different code division multiplexing group is provided with the different original positions of choosing respectively _i, each code division multiplexing group is from the δ of self correspondence _iBeginning is according to step-length λ _{Step_i}Selective sequential OCC, wherein, i represents the sequence number of code division multiplexing group, δ _iAnd λ _{Step_i}Be integer, and 0≤δ _i＜k, 1≤λ _{Step_i}＜k.

14. the generation device according to the described pilot frequency sequence of claim 13 is characterized in that, described selection module is further used for, and for n DMRS port of i code division multiplexing group, chooses the index of its pairing OCC in such a way: (δ _i+ n λ _{Step_i}+ α) mod k,

Wherein, mod is a modulo operation, works as λ _{Step_i}During for odd number, the value of α is 0; Work as λ _{Step_i}During even number,

15. generation device according to the described pilot frequency sequence of claim 10, it is characterized in that described selection module is further used for, adopt different initialization modes to produce the scramble sequence of DMRS different code division multiplexing groups, when two group codes are divided multiplexing group, first group according to

Initialization mode produce the scramble sequence of DMRS, wherein acquiescence

Or 1; Second group according to

Initialization mode produce the scramble sequence of DMRS.

16. generation device according to each described pilot frequency sequence of claim 10 to 15, it is characterized in that described pilot frequency sequence generation module is further used for, when the OCC that will select and scramble sequence multiply each other, on the adjacent DMRS carrier wave, for the OCC of each DMRS port correspondence oppositely shines upon.

17. the generation device according to each described pilot frequency sequence of claim 10 to 15 is characterized in that, described pilot frequency sequence generation module is further used for, and corresponding different code division multiplexing group i when OCC shines upon, adopts similar and different original position δ _{Occ_i}Skew, wherein 0≤δ _{Occ_i}＜L-1, L represent the length of OCC.

18. the generation device according to each described pilot frequency sequence of claim 17 is characterized in that, described δ _{Occ_i}Value be mod (SubcarierIndex+ ε _i, L), wherein, SubcarierIndex represents sub-carrier indices, L represents the length of each OCC.

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