CN102355442B - Method and device for generating UE-RS (user equipment-specific reference signals) in LTE (long term evolution) system - Google Patents

Abstract

The invention discloses a method and device for generating UE-RS (user equipment-specific reference signals) in an LTE (long term evolution) system. The method comprises the following steps of: multiplying the initial phases of the determined M sequences x1(n) and x2(n) by a first state transition matrix MC respectively to obtain the phases of the x1(n) and x2(n) on the PRB (physical resource block) with a frequency domain pointer as 0 on the first OFDM (orthogonal frequency division multiplexing) symbol taken by the UE-RS; performing cyclic shift on the current phases of x1(n) and x2(n) by use of a second state transition matrix MK and a third state transition matrix M110 to obtain the initial phase of the start PRB corresponding to the UE-RS; and performing cyclic shift on the initial phase of the start PRB corresponding to the UE-RS, and performing exclusive OR, complex value generation and mapping on the shift result to generate a UE-RS sequence. Through the scheme provided by the invention, the UE-RS generation speed can be effectively increased, thereby improving the working efficiency of the LTE system.

Description

In LTE system, generate method and the device of UE-RS

Technical field

The present invention relates to wireless communication technology field, particularly relate to the method and the device that in LTE system, generate UE-RS.

Background technology

LTE (Long Term Evolution system, long evolving system), it is the evolution of 3G mobile communication technology, the transmission rate with descending 100M and up 50M, support higher translational speed and larger coverage radius of cell simultaneously, support 200 of each communities user simultaneously online.And LTE also has band width configuration (1.4M～20M) flexibly, support the features such as multi-media broadcasting service and end-to-end QoS.Therefore, LTE has become one of standard of next generation mobile communication technology.

Multi-antenna technology, it is regarded as a series of technology general designations with common purpose, adopts many antennas on receiver or transmitter, and in conjunction with specific signal processing technology, carry out improved system performance, for example: improve power system capacity, Extended Cell coverage, improve user data rate.Wherein, beam shaping is a kind of closely spaced aerial array multi-antenna transmitting transferring technology that is applied to, its cardinal principle is to utilize the strong correlation of space channel and the principle of interference of ripple to produce the antenna pattern of highly directive, makes the main lobe of antenna pattern point to adaptively arrival bearing user.

The downlink transfer of LTE system adopts UE-RS (User Equipment-specific Reference Signals, user equipment specific pilot signal) carry out beam shaping, the UE-RS that user terminal generates by this locality and the UE-RS receiving are to PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) carry out channel response estimation, then according to channel response demodulation, go out the PDSCH data of transmitting terminal.

Wherein, the position in starting point in the process that is created on whole downlink wave beam excipient of UE-RS sequence.In generating the process of UE-RS, the Gold code sequence relating to generates the state side-play amount that has more number of times in formula, for example: before each generation Gold code sequence, M sequence x ₁and x (n) ₂(n) to carry out the cyclic shift of 1600 times respectively; UE-RS to the second OFDM symbol correspondence position corresponding to PRB (Physical Resources Blocks, Physical Resource Block) that frequency domain pointer is 0 on first shared OFDM symbol of UE-RS, M sequence x ₁and x (n) ₂(n) to carry out the cyclic shift of 660 or 880 times respectively, etc.If all these a large amount of useless cyclic shifts are carried out in single step, by the inefficiency that causes UE-RS to generate.

Therefore, how generating fast UE-RS is a focus meriting attention.

Summary of the invention

For solving the problems of the technologies described above, the embodiment of the present invention provides method and the device that generates UE-RS in a kind of LTE system, to improve the generating rate of UE-RS, and then the operating efficiency of raising LTE system, technical scheme is as follows:

In LTE system, generate a method of UE-RS, wherein, the initial PRB frequency domain pointer that UE-RS takies OFDM symbol is n, and described method comprises:

By determined M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, obtain x ₁and x (n) ₂(n) phase place of the PRB that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Utilize the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

The initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and shift result XOR, complex values are generated and mapping is processed, generate UE-RS sequence.

Accordingly, the embodiment of the present invention also provides the device that generates UE-RS in a kind of LTE system, comprising:

Initial phase determination module, for determining respectively M sequence x ₁and x (n) ₂(n) initial phase;

Fixed rotation module, for by determined M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, determine x ₁and x (n) ₂(n) phase place of the PRB that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Select circular shift module, for utilizing the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

UE-RS sequence generation module, for the initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and generates shift result XOR, complex values and mapping is processed, and generates UE-RS sequence.

The technical scheme that the embodiment of the present invention provides, by generating the process of UE-RS, the frequency domain pointer n corresponding according to the PRB on the shared OFDM symbol of UE-RS, utilizes state-transition matrix to M sequence x ₁and x (n) ₂(n) initial phase carries out corresponding cyclic shift, and then produces Gold code sequence and UE-RS sequence.In this programme, by x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _cafter, by selecting and corresponding the second state-transition matrix M of cyclic shift number of times _kwith third state transfer matrix M ₁₁₀, realize x ₁and x (n) ₂(n) state transitions of initial phase, has reduced a large amount of useless cyclic shifts, can effectively improve the generating rate of UE-RS, and then improves the operating efficiency of LTE system.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

In a kind of LTE system that Fig. 1 provides for the embodiment of the present invention, generate the flow chart of the method for UE-RS;

In a kind of LTE system that Fig. 2 provides for the embodiment of the present invention, generate the second flow chart of the method for UE-RS;

In a kind of LTE system that Fig. 3 provides for the embodiment of the present invention, generate the third flow chart of the method for UE-RS;

In a kind of LTE system that Fig. 4 provides for the embodiment of the present invention, generate the structural representation of the device of UE-RS.

Embodiment

The embodiment of the present invention provides a kind of method that generates UE-RS in LTE system, to improve the generating rate of UE-RS, and then the operating efficiency of raising LTE system.The initial PRB frequency domain pointer that UE-RS takies OFDM symbol is n, and the method comprises:

By determined M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, obtain x ₁and x (n) ₂(n) phase place of the PRB that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Utilize the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

The initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and shift result XOR, complex values are generated and mapping is processed, generate UE-RS sequence.

The technical scheme that the embodiment of the present invention provides, by generating the process of UE-RS, the frequency domain pointer n corresponding according to the PRB on the shared OFDM symbol of UE-RS, utilizes state-transition matrix to M sequence x ₁and x (n) ₂(n) initial phase carries out corresponding cyclic shift, and then produces Gold code sequence and UE-RS sequence.In this programme, by x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _cafter, by selecting and corresponding the second state-transition matrix M of cyclic shift number of times _kwith third state transfer matrix M ₁₁₀, realize x ₁and x (n) ₂(n) state transitions of initial phase, has reduced a large amount of useless cyclic shifts, can effectively improve the generating rate of UE-RS, and then improves the operating efficiency of LTE system.

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

Below in conjunction with concrete application scenarios, the method that generates UE-RS in a kind of LTE system that the embodiment of the present invention is provided describes in detail.

The UE-RS of the multi-flow beam excipient of LTE system support comprises antenna port p=7,8,9......, and υ+6, wherein, υ is the number of plies of PDSCH transmission.For P ∈ { 7,8,9......, any antenna port in υ+6}, the initial PRB frequency domain pointer that UE-RS takies OFDM symbol is n, generates the method for UE-RS in a kind of LTE system that the embodiment of the present invention provides, as shown in Figure 1, can comprise the following steps:

S101, determines M sequence x ₁and x (n) ₂(n) initial phase;

Wherein, x ₁(n) initial phase of sequence is x ₁(0)=1, x ₁(n)=0, n=1,2,3 ..., 30; x ₂(n) initial phase of sequence each subframe start carry out initialization, by initial value

obtain, wherein, initial value c _initgeneration formula be:

Wherein, when PDSCH does not transmit the DCI form of 2B and 2C, for antenna port p=7,8, UE thinks the ID territory n of scrambling _sCIDequal 0; And for antenna port p=9,10......, 14, UE thinks n _sCIDequal 0.

S102, by M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, obtain x ₁and x (n) ₂(n) phase place of the PRB that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Wherein, antenna port is p, and system bandwidth comprises N PRB.PDSCH takies one section of PRB, and initial PRB frequency domain pointer is n, takies continuously m PRB.Wherein, n ∈ [0, N], m ∈ [1, N-n].The N ∈ [6,100] that the various system bandwidths of 1.4MHz～20MHz are corresponding.Fixing state side-play amount Nc=1600, the first corresponding state-transition matrix is M _c={ M _c1, M _c2.

S103, utilizes the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

Under normal CP (Cyclic Prefix, Cyclic Prefix) pattern, corresponding 3 UE-RS of each PRB, corresponding 2 c (n) sequential value of each UE-RS; And under expansion CP pattern, corresponding 4 UE-RS of each PRB, corresponding 2 c (n) sequential value of each UE-RS.Wherein, c (n) is M sequence x ₁and x (n) ₂(n) through cyclic shift, the Gold code sequence that XOR obtains.So, for sequence x ₁and x (n) ₂(n), state transitions Nx continuous PRB, i.e. cyclic shift K=Nx * 6 time under normal CP pattern, or under expansion CP pattern cyclic shift K=Nx * 8 time, the second state-transition matrix M that corresponding symbol internal state shifts _k={ M _1N, M _2N(under normal CP pattern) or M _k={ M _1E, M _2E(expansion CP pattern).Different system bandwidths can, according to different strategies, arrange different Nx values.In addition the intersymbol state transitions of OFDM,

individual continuous PRB, the third state transfer matrix M of corresponding intersymbol state transitions ₁₁₀={ M _{1N_110}, M _{2N_110}(normal CP pattern) or M ₁₁₀={ M _{1E_110}, M _{2E_110}(expansion CP pattern).

Wherein, utilize the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, as shown in Figure 2, is specially:

S201, judges whether the serial number P of the OFDM symbol that UE-RS takies equals 1; If P=1, directly performs step S203, otherwise, execution step S202;

S202, by x ₁and x (n) ₂(n) current phase place is multiplied by respectively third state transfer matrix M ₁₁₀(P-1) power carry out after the intersymbol state transitions of OFDM, execution step S203;

Work as P=2,3 or 4 o'clock, need first by x ₁and x (n) ₂(n) current phase place is multiplied by respectively third state transfer matrix M ₁₁₀(P-1) power, determine x ₁and x (n) ₂(n) after the phase place of the PRB that frequency domain pointer is 0 on P shared OFDM symbol of UE-RS, execution step S203.

S203, utilizes the second state-transition matrix M _k, respectively to x ₁and x (n) ₂(n) current phase place is carried out the cyclic shift in OFDM symbol.

Further, the described second state-transition matrix M that utilizes _k, respectively to x ₁and x (n) ₂(n) cyclic shift in the OFDM symbol that current phase place is carried out is processed, and is specially:

Frequency domain pointer n according to initial PRB corresponding to UE-RS, determines shared sector number L, wherein, and the corresponding N of each section _xindividual continuous PRB, corresponding K cyclic shift, corresponding the second state-transition matrix M _k;

When under normal CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 6n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 6n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding;

In the time of under expanding CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 8n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 8n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding.

Illustrate below:

On first OFDM symbol taking at normal CP pattern UE-RS, when the first section on this symbol of the frequency domain pointer n of initial PRB corresponding to UE-RS, that is: K > 6n >=0, while producing UE-RS corresponding to PRB, needs respectively to sequence x ₁and x (n) ₂(n) current phase loop displacement 6n time, can obtain frequency domain pointer and be the initial phase of the UE-RS that the PRB of n is corresponding; When the second section on this symbol of the frequency domain pointer n of initial PRB corresponding to UE-RS, that is: 2K > 6n >=K, needs sequence x ₁and x (n) ₂(n) current phase place is multiplied by respectively the second state-transition matrix M _k={ M _1N, M _2Nafter, more respectively to the current phase loop displacement of sequence 6n-K time, can obtain frequency domain pointer and be the initial phase of the UE-RS that the PRB of n is corresponding; When the 3rd section on this symbol of the frequency domain pointer n of initial PRB corresponding to UE-RS, that is: 3K > 6n >=2K, needs sequence x ₁and x (n) ₂(n) current phase place is multiplied by respectively the second state-transition matrix M _k={ M _1N, M _2Nquadratic power after, more respectively to the current phase loop displacement of sequence 6n-2K time, can obtain frequency domain pointer and be the initial phase of the UE-RS that the PRB of n is corresponding; By that analogy.

In like manner, under normal CP pattern on shared second, third of UE-RS or the 4th OFDM symbol, at sequence x ₁and x (n) ₂(n) current phase place is multiplied by respectively third state transfer matrix M ₁₁₀={ M _{1N_110}, M _{2N_110}first power, quadratic power, cube, obtain phase place corresponding to PRB that frequency domain pointer is 0 on this OFDM symbol.Now, the generation of the UE-RS in this OFDM symbol, consistent with the generating mode of UE-RS in first OFDM symbol.

Under expansion CP pattern, in the process of cyclic shift, the second state-transition matrix M utilizing _kwith third state transfer matrix M ₁₁₀be respectively M _k={ M _1E, M _2Eand M ₁₁₀={ M _{1E_110}, M _{2E_110}.

S104, carries out cyclic shift by the initial phase of initial PRB corresponding to UE-RS, and shift result XOR, complex values is generated and mapping is processed, and generates UE-RS sequence.

The described initial phase by initial PRB corresponding to UE-RS carries out cyclic shift, and shift result XOR, complex values is generated and mapping is processed, and generates UE-RS sequence, as shown in Figure 3, is specially:

S301, carries out cyclic shift to the initial phase of initial PRB corresponding to UE-RS, and to x ₁and x (n) ₂(n) carry out XOR, obtain Gold code sequence c (n);

S302, generates formula r (m) by Gold code sequence c (n) substitution UE-RS plural number, determines the complex values that UE-RS sequence is corresponding;

S303, is mapped to complex values modulation symbol by complex values corresponding to described UE-RS sequence, generates UE-RS sequence.

To x ₁and x (n) ₂(n) carry out, after shifting processing, being carried out XOR processing, obtain Gold code sequence c (n), and c (n) substitution plural number is generated to formula r (m), determine the complex values that UE-RS sequence is corresponding:

$r\left(m\right)=\frac{1}{\sqrt{2}}(1-2\·c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\·c(2m+1)),$

For antenna port p=7,8,9......, υ+6, in a subframe, are assigned with as being mapped to complex values modulation symbol corresponding to UE-RS corresponding to the PRB of PDSCH

wherein, under normal CP pattern, the mapping mode of UE-RS sequence is:

$a_{k,l}^{\left(p\right)}=w_p\left(l^{\′}\right)\·r(3\·l^{\′}\·N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+3\·n_{\mathrm{PRB}}+m^{\′})$

Wherein,

$w_p\left(i\right)=\left\{\begin{array}{cc}{\stackrel{\‾}{w}}_p\left(i\right)& (m^{\′}+n_{\mathrm{PRB}})\mathrm{mod}2=0\\ {\stackrel{\‾}{w}}_p(3-i)& (m^{\′}+n_{\mathrm{PRB}})\mathrm{mod}2=1\end{array}\right.$

$k=5m^{\′}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\′}$

$k^{\′}=\left\{\begin{array}{cc}1& p\∈\left\{\mathrm{7,8,11,13}\right\}\\ 0& p\∈\left\{\mathrm{9,10,12,14}\right\}\end{array}\right.$

$l^{\′}=\left\{\begin{array}{cc}\mathrm{0,1,2,3}& \mathrm{if}{n}_s\mathrm{mod}2=0\mathrm{and\; in\; a\; special\; subframe\; with\; configuration}\mathrm{1,2,6},\mathrm{or}7\\ \mathrm{0,1}& \mathrm{if}{n}_s\mathrm{mod}2=0\mathrm{and\; not\; in\; special\; subframe\; with\; configuration}\mathrm{1,2,6},\mathrm{or}7\\ \mathrm{2,3}& \mathrm{if}{n}_s\mathrm{mod}2=1\mathrm{and\; not\; in\; special\; subframe\; with\; configuration}\mathrm{1,2,6},\mathrm{or}7\end{array}\right.$

m′＝0，1，2

Scramble sequence

by table 1, provided:

Table 1

Under expansion CP pattern, the mapping mode of UE-RS sequence is:

$a_{k,l}^{\left(p\right)}=w_p\left(l^{\′}\right)\·r(4\·l^{\′}\·N_{\mathrm{RB}}^{\max ,\mathrm{DL}}+4\·n_{\mathrm{PRB}}+m^{\′})$

Wherein,

$w_p\left(i\right)=\left\{\begin{array}{cc}{\stackrel{\‾}{w}}_p\left(i\right)& m^{\′}+\mathrm{mod}2=0\\ {\stackrel{\‾}{w}}_p(1-i)& m^{\′}+\mathrm{mod}2=1\end{array}\right.$

$k=3m^{\′}+N_{\mathrm{sc}}^{\mathrm{RB}}{n}_{\mathrm{PRB}}+k^{\′}$

$k^{\′}=\left\{\begin{array}{cc}1& \mathrm{if}{n}_s\mathrm{mod}2=0\mathrm{andp}\∈\left\{\mathrm{7,8}\right\}\\ 2& \mathrm{if}{n}_s\mathrm{mod}2=1\mathrm{andp}\∈\left\{\mathrm{7,8}\right\}\end{array}\right.$

l＝l′mod?2+4

$l^{\′}=\left\{\begin{array}{cc}\mathrm{0,1}& \mathrm{if}{n}_s\mathrm{mod}2=0\mathrm{and\; in\; a\; special\; subframe\; with\; configuration}\mathrm{1,2,3,5}\mathrm{or}6\\ \mathrm{0,1}& \mathrm{if}{n}_s\mathrm{mod}2=1\mathrm{and\; not\; in\; a\; special\; subframe}\end{array}\right.$

m′＝0，1，2，3

Scramble sequence

by table 2, provided:

Table 2

The technical scheme that the embodiment of the present invention provides, by generating the process of UE-RS, the frequency domain pointer n corresponding according to the PRB on the shared OFDM symbol of UE-RS, utilizes state-transition matrix to M sequence x ₁and x (n) ₂(n) initial phase carries out corresponding cyclic shift, and then produces Gold code sequence and UE-RS sequence.In this programme, by x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _cafter, by selecting and corresponding the second state-transition matrix M of cyclic shift number of times _kwith third state transfer matrix M ₁₁₀, realize x ₁and x (n) ₂(n) state transitions of initial phase, has reduced a large amount of useless cyclic shifts, can effectively improve the generating rate of UE-RS, and then improves the operating efficiency of LTE system.

On the basis of above-described embodiment, the method that the present invention also provides the UE-RS sequence of PRB segment assignments to generate, concrete scheme is described as:

For antenna port p, system bandwidth comprises N PRB, the N ∈ [6,100] that the various system bandwidths of 1.4MHz～20MHz are corresponding.Wherein, PDSCH occupies the PRB of two sections of continuous dispensing, and initial frequency domain pointer is respectively n1, and n2 takies respectively m1 continuously, m2 PRB, and m1+m2 < n2.

On first shared OFDM symbol of normal CP pattern UE-RS, the 1st section of UE-RS sequence corresponding to PRB generates as described in above-described embodiment.This section of frequency domain pointer corresponding to last 1 PRB of PRB is (n1+m1-1), and a corresponding new phase place.The UE-RS sequence corresponding for the second segment PRB on this OFDM symbol generates, and as K > n2-(n1+m1) > 0, needs x ₁and x (n) ₂(n), after new phase loop displacement 6 * (n2-(n1+m1)) is inferior, can obtain frequency domain pointer and be the initial phase of the UE-RS that the PRB of n2 is corresponding; As 2K > n2-(n1+m1) > K, need x ₁and x (n) ₂(n) new initial phase is multiplied by the second state-transition matrix M _k={ M _1N, M _2N, after recirculation displacement 6 * (n2-(n1+m1))-K time, can obtain frequency domain pointer and be the initial phase of the UE-RS that the PRB of n2 is corresponding; As 3K > n2-(n1+m1) > 2K, need x ₁and x (n) ₂(n) new initial phase is multiplied by the second state-transition matrix M _k={ M _1N, M _2Nsquare after, after recirculation displacement 6 * (n2-(n1+m1))-2K time, can obtain frequency domain pointer and be the initial phase of the UE-RS that the PRB of n2 is corresponding; By that analogy.

In like manner, under expansion CP pattern, in the process of cyclic shift, the second state-transition matrix M utilizing _kwith third state transfer matrix M ₁₁₀be respectively M _k={ M _1E, M _2Eand M ₁₁₀={ M _{1E_110}, M _{2E_110}.

By the description of above embodiment of the method, those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize, can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as read-only memory (ROM), random access memory (RAM), magnetic disc or CDs.

Corresponding to embodiment of the method above, the embodiment of the present invention also provides the device that generates UE-RS in a kind of LTE system, and as shown in Figure 4, this device comprises:

Initial phase determination module 110, for determining respectively M sequence x ₁and x (n) ₂(n) initial phase;

Fixed rotation module 120, for by determined M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, determine x ₁and x (n) ₂(n) phase place of the PRB that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Select circular shift module 130, for utilizing the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

UE-RS sequence generation module 140, for the initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and generates shift result XOR, complex values and mapping is processed, and generates UE-RS sequence.

Wherein, select circular shift module 130 to comprise:

Judging unit, for judging the serial number P of the OFDM symbol that UE-RS takies; Work as P=1, trigger cycle shift unit in OFDM symbol; Work as P=2,3 or 4, trigger OFDM intersymbol state transitions unit;

Cycle shift unit in OFDM symbol, utilizes the second state-transition matrix M _k, respectively to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing;

OFDM intersymbol state transitions unit, for by x ₁and x (n) ₂(n) current phase place is multiplied by respectively third state transfer matrix M ₁₁₀(P-1) power, determine x ₁and x (n) ₂(n), after the phase place of the PRB that frequency domain pointer is 0 on P shared OFDM symbol of UE-RS, trigger cycle shift unit in described OFDM symbol.

Further, in described OFDM symbol, the detailed process of cycle shift unit is:

Frequency domain pointer n according to initial PRB corresponding to UE-RS, determines shared sector number L, wherein, and the corresponding N of each section _xindividual continuous PRB, corresponding K cyclic shift, corresponding the second state-transition matrix M _k;

When under normal CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 6n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 6n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding;

In the time of under expanding CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 8n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 8n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding.

Wherein, UE-RS sequence generation module 140 comprises:

XOR unit, for the initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and to x ₁and x (n) ₂(n) carry out XOR, obtain Gold code sequence c (n);

Complex values generation unit, for Gold code sequence c (n) substitution UE-RS plural number is generated to formula r (m), determines the complex values that UE-RS sequence is corresponding;

UE-RS complex values map unit, for complex values corresponding to described UE-RS sequence is mapped to complex values modulation symbol, generates UE-RS sequence.

For device or system embodiment, because it is substantially corresponding to embodiment of the method, so relevant part is referring to the part explanation of embodiment of the method.Device described above or system embodiment are only schematic, the wherein said unit as separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in a plurality of network element.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.

In several embodiment provided by the present invention, should be understood that, disclosed system, apparatus and method, not surpassing in the application's spirit and scope, can realize in other way.Current embodiment is a kind of exemplary example, should be as restriction, and given particular content should in no way limit the application's object.For example, the division of described unit or subelement, is only that a kind of logic function is divided, and during actual realization, can have other dividing mode, and for example a plurality of unit or a plurality of subelement combine.In addition, a plurality of unit can or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.

In addition, institute's descriptive system, the schematic diagram of apparatus and method and different embodiment, within not exceeding the application's scope, can with other system, module, technology or method in conjunction with or integrated.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.

The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. in LTE system, generate a method of user equipment specific pilot signal (UE-RS), it is characterized in that, initial Physical Resource Block (PRB) the frequency domain pointer that UE-RS takies OFDM symbol is n, and described method comprises:

By determined M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, obtain x ₁and x (n) ₂(n) phase place of the PRB that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Utilize the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

The initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and shift result XOR, complex values are generated and mapping is processed, generate UE-RS sequence;

Wherein, the described second state-transition matrix M that utilizes _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) detailed process that current phase place is carried out cyclic shift processing comprises:

Determine the serial number P of the OFDM symbol that UE-RS takies;

If P=1, utilizes the second state-transition matrix M _k, respectively to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing;

Otherwise, if P=2,3 or 4, by x ₁and x (n) ₂(n) current phase place is multiplied by respectively third state transfer matrix M ₁₁₀(P-1) power, recycling the second state-transition matrix M _k, respectively to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing;

Wherein, the described second state-transition matrix M that utilizes _k, respectively to x ₁and x (n) ₂(n) detailed process that current phase place is carried out cyclic shift processing comprises:

Frequency domain pointer n according to initial PRB corresponding to UE-RS, determines shared sector number L, wherein, and the corresponding N of each section _xindividual continuous PRB, corresponding K cyclic shift, corresponding the second state-transition matrix M _k, wherein, K represents N _xthe number of times of the cyclic shift that individual continuous PRB is corresponding;

When under normal CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 6n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 6n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding;

In the time of under expanding CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 8n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 8n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding.

2. method according to claim 1, is characterized in that, the described initial phase by initial PRB corresponding to UE-RS carries out cyclic shift, and shift result XOR, complex values is generated and mapping is processed, and generates UE-RS sequence, is specially:

Initial phase to initial PRB corresponding to UE-RS carries out cyclic shift, and to x ₁and x (n) ₂(n) carry out XOR, obtain Gold code sequence c (n);

Gold code sequence c (n) substitution UE-RS plural number is generated to formula r (m), determine the complex values that UE-RS sequence is corresponding;

Complex values corresponding to described UE-RS sequence is mapped to complex values modulation symbol, generates UE-RS sequence.

3. in LTE system, generate a device of user equipment specific pilot signal (UE-RS), it is characterized in that, comprising:

Initial phase determination module, for determining respectively M sequence x ₁and x (n) ₂(n) initial phase;

Fixed rotation module, for by determined M sequence x ₁and x (n) ₂(n) initial phase is multiplied by respectively the first state-transition matrix M _c, determine x ₁and x (n) ₂(n) phase place of the Physical Resource Block (PRB) that on first OFDM symbol taking at UE-RS, frequency domain pointer is 0;

Select circular shift module, for utilizing the second state-transition matrix M _kwith third state transfer matrix M ₁₁₀, to x ₁and x (n) ₂(n) current phase place is carried out cyclic shift processing, obtains the initial phase of the initial PRB that UE-RS is corresponding;

UE-RS sequence generation module, for the initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and generates shift result XOR, complex values and mapping is processed, and generates UE-RS sequence;

Wherein, described selection circular shift module comprises:

Judging unit, for judging the serial number P of the OFDM symbol that UE-RS takies; Work as P=1, trigger cycle shift unit in OFDM symbol; Work as P=2,3 or 4, trigger OFDM intersymbol state transitions unit;

Cycle shift unit in OFDM symbol, the frequency domain pointer n according to initial PRB corresponding to UE-RS, determines shared sector number L, wherein, the corresponding N of each section _xindividual continuous PRB, corresponding K cyclic shift, corresponding the second state-transition matrix M _k, wherein, K represents N _xthe number of times of the cyclic shift that individual continuous PRB is corresponding;

When under normal CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 6n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 6n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding;

In the time of under expanding CP pattern:

If L=1, respectively to x ₁and x (n) ₂(n) current phase loop displacement 8n time;

Otherwise, respectively to x ₁and x (n) ₂(n) current phase multiplication is with the second state-transition matrix M _k(L-1) power after, recirculation displacement 8n-(L-1) K time, obtains the initial phase of the initial PRB that UE-RS is corresponding;

OFDM intersymbol state transitions unit, for by x ₁and x (n) ₂(n) current phase place is multiplied by respectively third state transfer matrix M ₁₁₀(P-1) power, determine x ₁and x (n) ₂(n), after the phase place of the PRB that frequency domain pointer is 0 on P shared OFDM symbol of UE-RS, trigger cycle shift unit in described OFDM symbol.

4. device according to claim 3, is characterized in that, described UE-RS sequence generation module comprises:

XOR unit, for the initial phase of initial PRB corresponding to UE-RS is carried out to cyclic shift, and to x ₁and x (n) ₂(n) carry out XOR, obtain Gold code sequence c (n);

Complex values generation unit, for Gold code sequence c (n) substitution UE-RS plural number is generated to formula r (m), determines the complex values that UE-RS sequence is corresponding;

UE-RS complex values map unit, for complex values corresponding to described UE-RS sequence is mapped to complex values modulation symbol, generates UE-RS sequence.

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