CN106559193A - The in a wireless communication system method and apparatus processed by DMRS signals - Google Patents

Abstract

The present invention relates to be used for the method and apparatus for processing DMRS signals in a kind of base station and user equipment based on LTE protocol, according to the method for one aspect of the invention, including a kind of method there is provided being used for processing DMRS signals in base station based on LTE protocol, wherein, the method also includes before OFDMA modulation is carried out：- to can use the OCC on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, to reduce the unbalanced power between the OFDM symbol for subsequently generating.Scheme of the invention can eliminate or reduce imbalance problem between the OFDM symbol existed under DMRS enhancement techniques in existing LTE protocol.

Description

The in a wireless communication system method and apparatus processed by DMRS signals

Technical field

The present invention relates to wireless communication technology, more particularly to the method and apparatus based on being processed to demodulated reference signal (DMRS) signal in the wireless communication system of Long Term Evolution (LTE).

Background technology

In LTE R13 agreements, third generation partner program (3GPP) tissue has decided to consider using DMRS enhancement techniques preferably to support descending multi-user-multiple-input, multiple-output (MU-MIMO).With regard to this point, some alternatives are proposed in technical report TR36.897, support expanded downstream DMRS, for reducing interfering between DMRS port.

Wherein, in the alternative 1 that current 3GPP is proposed, orthogonal covering codes (OCC, Orthogonal Cover Code)=4 and in each Physical Resource Block (PRB) using 12 resource cell (RE, Resource Element), strengthened on the basis of existing antenna port 7,8,11,13, this mode has several advantages, such as minimum reference signal (RS) expense, punch without extra RE, operation to MU is invisible, therefore is probably supported by 3GPP.However, current DMRS patterns can cause alternative 1 to have the problem of power jitter between the OFDM symbol residing for DMRS.The problem of this namely so-called unbalanced power, this needs to be avoided when using reference signal design.In order to solve this problem, the present invention proposes a kind of DMRS port based on for extension using the scheme of new OCC patterns to solve this problem.

In current LTE protocol, there are two kinds of OCC patterns as follows：

Wherein, p is antenna end slogan；

In the alternative 1 of above-mentioned TR36.897, both OCC patterns with the 7th, 8,11, alternately recycle on the corresponding DMRS subcarriers of 13 antenna ports.Sequence definition following Walsh (Walsh) conversion code that each port uses：

If we are rewritten as following walsh matrixes

Pattern is rotated thenand[a b c d] and [d c b a] can be expressed as accordingly just.Hypothesis has four multi-user's layers (MU layers), can be expressed as z in the precoding weight of the correlation of n-th transmitting antenna of eNB sides_n=[z_n,1 z_n,2 z_n,3 z_n,4]^T. so, as shown in Figure 1, in four DMRS OFDM symbols of a sub- frame in, the transmission power of n-th transmitting antenna is respectively：

Due to precoding vector z_nDepend on channel condition so that the DMRS transmission powers of four symbols are different to more than.Worst situation is z_nWith { a, b, c, d } one of sequences match.For example, if z_n=a=[+1+1+1+1]^T, thenand This may result in the power jitter between OFDM symbol, cause the unbalanced power between OFDM symbol.

The content of the invention

The invention aims to solve imbalance problem between the OFDM symbol existed under DMRS enhancement techniques in existing LTE protocol.

According to the first aspect of the invention, there is provided in a kind of base station based on LTE protocol be used for process DMRS signals method, wherein, the method carry out OFDMA modulation before also include：

- to can use the OCC on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, to reduce the unbalanced power between the OFDM symbol for subsequently generating.

According to the second aspect of the invention, there is provided in a kind of user equipment based on LTE process DMRS signals method, wherein, including：

OCC on subcarrier corresponding with available DMRS antenna ports in data block Jing after OFDM demodulation is carried out the process of contrary is processed with the pattern rotation in method according to a first aspect of the present invention.

According to the third aspect of the invention we, there is provided be used for processing the device of DMRS signals in a kind of base station based on LTE protocol, wherein, before OFDMA modulation is carried out, the device also includes：

Pattern round-robin processing device, for can use the OCC on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, to reduce the unbalanced power between the OFDM symbol for subsequently generating.

According to the fourth aspect of the invention, there is provided in a kind of user equipment based on LTE process DMRS signals device, wherein, including：

Pattern rotation inversely processing device, for carrying out the process of contrary is processed with the pattern rotation in aforementioned base station described according to a third aspect of the present invention to the OCC on subcarrier corresponding with available DMRS antenna ports in the data block Jing after OFDM demodulation.

Scheme of the invention can eliminate or reduce imbalance problem between the OFDM symbol existed under DMRS enhancement techniques in existing LTE protocol.

Description of the drawings

The present invention be will be more fully understood by the detailed description and the accompanying drawings forth below, wherein identical unit is indicated by the same numbers, accompanying drawing is merely possible to illustrate what is provided, therefore is not intended to limit the invention, and wherein：

OCC rotation pattern in the Current protocols that Fig. 1 shows according to LTE R12 agreements；

Fig. 2 shows according to an embodiment of the invention based on the OCC obtained after the processing to DMRS signals of column permutation rotation patterns；

Fig. 3 shows according to another embodiment of the present invention based on the OCC obtained after the processing to DMRS of frequency dependence code rotation patterns；

Fig. 4 illustrates the method flow diagram that DMRS signals are processed in the base station based on LTE according to one aspect of the invention；

Fig. 5 illustrates the method flow diagram that DMRS signals are processed in the user equipment based on LTE according to a further aspect of the invention；

Fig. 6 illustrates the device block diagram that DMRS signals are processed in the base station based on LTE according to one aspect of the invention；

Fig. 7 illustrates the device block diagram that DMRS signals are processed in the user equipment based on LTE according to a further aspect of the invention；

It should be mentioned that the general characteristic of method, structure and/or material utilized in some of the exemplary embodiments by these accompanying drawing meant for illustration, and the written description to being provided behind makes supplement.But these accompanying drawings are not necessarily drawn to scale and may accurately not reflect the accurate structure or Performance Characteristics of any given embodiment, and are not interpreted as defining or limiting the scope of the numerical value or attribute covered by exemplary embodiment.Reference be similar to used in each width figure or identical is for the presence for showing similar or identical unit or feature.

Specific embodiment

Although exemplary embodiment can have various modifications and alternative forms, some embodiments being shown in which by way of example in the accompanying drawings, and will be described in detail herein.It should be understood, however, that be not intended for exemplary embodiment to be restricted to disclosed concrete form, conversely, exemplary embodiment is intended to cover all modifications, equivalents and the alternative for falling within the scope of the appended claims.Identical reference refers to identical unit in the description of each width figure all the time.

It should be mentioned that some exemplary embodiments are described as process or the method described as flow chart before exemplary embodiment is discussed in greater detail.Although operations to be described as flow chart the process of order, many of which operation can be by concurrently, concomitantly or while implement.Additionally, the order of operations can be rearranged.The process when its operations are completed can be terminated, it is also possible to have the additional step being not included in accompanying drawing.The process can correspond to method, function, code, subroutine, subprogram etc..

Term " wireless device " used herein above or " equipment " can be considered synonymous with the following and can be referred to as sometimes the following below：Client, user equipment, movement station, mobile subscriber, mobile terminal, subscriber, user, distant station, access terminal, receptor, mobile unit etc., and the long-distance user of Radio Resource in cordless communication network can be described.

Similarly, term " base station " used herein above can be considered synonymous with the following and can be referred to as sometimes the following below：B node, evolved B node, eNodeB, base transceiver stations (BTS), RNC etc., and can be described in can cross over multiple technology generations cordless communication network in communicate with mobile terminal and provided Radio Resource transceiver.In addition to implementing the ability of method discussed herein, base station discussed herein can be functional with the institute being associated with traditional well-known base station.

Method (some of them are illustrated by flow process) discussed hereafter can be implemented by hardware, software, firmware, middleware, microcode, hardware description language or its combination in any.When with software, firmware, middleware or microcode to implement, during machine or computer-readable medium (such as storage medium) can be stored in the program code or code segment of implementing necessary task.(one or more) processor can implement necessary task.

Concrete structure disclosed herein and function detail are only representational, and are the purposes for describing the exemplary embodiment of the present invention.But the present invention can be implemented by many alternative forms, and is not interpreted as being limited only by the embodiments set forth herein.

Although it should be appreciated that may have been used term " first ", " second " etc. here to describe unit, these units should not be limited by these terms.Using these terms just for the sake of a unit and another unit are made a distinction.For example, in the case of the scope without departing substantially from exemplary embodiment, first module can be referred to as second unit, and similarly second unit can be referred to as first module.Term "and/or" used herein above includes any and all combination of one of them or more listed associated items.

It should be appreciated that when a unit is referred to as " connection " or during " coupled " to another unit, which can be connected or coupled to another unit, or there may be temporary location.On the other hand, when a unit is referred to as " when being directly connected " or " directly coupled " to another unit, then there is no temporary location.Should explain in a comparable manner be used for describing the relation between unit other words (for example " between being in ... " compared to " between being directly in ... ", " and with ... it is neighbouring " compared to " and with ... be directly adjacent to " etc.).

Term used herein above is not intended to limit exemplary embodiment just for the sake of description specific embodiment.Unless the context clearly dictates otherwise, singulative " one " otherwise used herein above, " one " also attempt to include plural number.It is to be further understood that, term " including " used herein above and/or "comprising" specify the presence of stated feature, integer, step, operation, unit and/or component, and do not preclude the presence or addition of one or more other features, integer, step, operation, unit, component and/or its combination.

It should further be mentioned that in some replaces realization modes, the function/action being previously mentioned can occur according to the order different from indicating in accompanying drawing.For example, depending on involved function/action, the two width figures for illustrating in succession can essentially substantially simultaneously be performed or can be performed in a reverse order sometimes.

Unless otherwise defined, otherwise all terms used herein (including technology and scientific terminology) all with exemplary embodiment art in the identical implication that is generally understood of technical staff.It is to be further understood that, unless be explicitly defined here, those terms otherwise for example defined in the dictionary being usually used should be construed as with the implication consistent with its implication in the context of association area, and should not explain according to Utopian or excessively formal meaning.

The some parts of exemplary embodiment and corresponding detailed description in detail are given by the software or algorithm in computer storage and for the symbol of the operation of data bit is represented.These descriptions and expression are those skilled in the art the description and expression of its work essence are effectively passed on to others skilled in the art.As which is typically used, term " algorithm " used herein above is envisaged as obtaining the self-congruent sequence of steps of desired result.The step is those steps for needing to carry out physical magnitude physical manipulation.Generally rather than it is necessary that these quantity take optics, the form of electric or magnetic signal that can be stored, transmitted, being combined, being compared and being manipulated otherwise.The reason for primarily for being usually used, it has proved that be easily these signals as bits, numerical value, element, symbol, character, item, numeral etc. sometimes.

The symbol with reference to the action and operation that may be implemented as program module or function treatment is represented (for example in a flowchart) to describe illustrative embodiment in description below, described program module or function treatment include enforcement particular task or the routine for implementing particular abstract data type, program, object, component, data structure etc., and can be implemented using the existing hardware at existing network unit.Such existing hardware can include one or more CPU (CPU), digital signal processor (DSP), special IC, field programmable gate array (FPGA) computer etc..

But it would be recognized that all these and similar terms should be associated with appropriate physical magnitude, and it is only the convenient label for being applied to these quantity.Unless clearly Stated otherwise or from discussion this it appears that, otherwise for example " process ", " calculating ", " it is determined that " or the term such as " display " refer to the action and process of computer system or similar electronic computing device, its to be represented as in the RS of the computer system physics, electron amount data manipulate, and be converted into other data of the physical magnitude in being similarly represented as the computer system memory or depositor or the storage of other this type of informations, transmission or display devices.

It should further be mentioned that the aspect that the software of exemplary embodiment is implemented is typically encoded on some form of program recorded medium or by certain type of transmission medium implementing.Described program storage medium can be magnetic (such as floppy disk or hard disk drive) or optics (such as aacompactadisk read onlyamemory or " CD ROM ") storage medium, and can be read-only or random-access storage medium.Similarly, the transmission medium can be twisted-pair feeder, coaxial cable, optical fiber or certain other appropriate transmission medium known in the art.Exemplary embodiment is not by being limited in terms of these of any given implementation.

Processor and memorizer can carry out running gear function with a biconditional operation.For example, memorizer can store the code segment with regard to apparatus function.The code segment again can be by computing device.Additionally, memorizer can store process variable and constant so that processor is used.

Method in a kind of base station based on LTE protocol that Fig. 4 shows according to one aspect of the invention for processing DMRS signals.Wherein, as shown in Figure 4：

In step S401, base station carries out pattern round-robin processing to the OCC on the corresponding subcarrier of available DMRS antenna ports, to reduce the unbalanced power between the OFDM symbol for subsequently generating；

Subsequently in step S402, base station generates OFDM symbol to carrying out OFDM modulation Jing the data block after pattern rotation process is carried out to OCC comprising described.

Namely, in order to solve the problems, such as present in the DMRS enhancement techniques of existing LTE protocol unbalanced power between OFDM symbol, base station of the invention is by can use the OCC patterns on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, subsequently OFDM symbol is generated to carrying out OFDM modulation Jing the data block after pattern rotation process is carried out to OCC comprising described again.

Specifically, above-mentioned pattern rotation processing procedure include but is not limited in pattern to DMRS using OCC rotation pattern carry out a certain degree of conversion, such as conversion based on column permutation and frequency dependence code.Two kinds of implementations of the conversion based on column permutation and frequency dependence code are given individually below.

Scheme based on column permutation：

In step S401, the OCC on the corresponding subcarrier of the described pair of available DMRS antenna port carry out pattern round-robin processing the step of include：

- to can use the M=4 DMRS OCC rotation pattern provided using equation below on the corresponding subcarrier of DMRS antenna ports：

{WE₀,WE₁,WE₂,WE₃} (1)

Wherein, E_i4x4 permutation matrix, i.e. E_iEvery string all differ, and from in following collection select：

And meet following condition：

。

Below to specify in current LTE protocol for DMRS as a example by enhanced 4 antenna ports 7/8/11/13, scheme of the above based on column permutation is further illustrated with two examples：

Example 1 ：

Wherein, E_iFor：

Obviously, E_iMeet the condition of above formula (2), then as shown in Fig. 2 OCC rotation patterns are：

WE₀=[a b c d]

WE₁=[d c b a]

WE₂=[c d a b]

WE₃=[b a d c]

Here, as shown by the following formula, we can be with it is easily verified that the intersymbol transmission powers of DMRS in this example Jing after column permutation be identical.

If PRB numbers are 4 integral multiples, the postrotational DMRS OCC patterns (hereinafter referred to as " OCC patterns ") based on this example eliminate the problem of the power jitter between distinct symbols.Above-mentioned postrotational OCC patterns being updated in original walsh matrixes, being seen in this example, port 7/8 to remain in that and pattern is rotated with R12 identicalsDMRS OCC patterns on port 11/13 are transformed to：

As a kind of preferred version, as the OCC patterns on port 7/8 do not change, thus the example can in DMRS enhancement techniques compatibility R12 and more older version user equipment.

In general, in addition to example 1, if the user equipment of R12 and more older version will be supported in DMRS enhancement techniques, to E_iAnother restrictive condition for selecting is to ensure that the OCC rotation patterns of port 7/8 are identical with OCC patterns specified in R12 agreements.

Example 2 ：

In this example, E_iFor：

Similarly, E_iAlso meet the condition of formula (2).OCC rotates pattern：

WE₀=[a b c d]

WE₁=[d a b c]

WE₂=[c d a b]

WE₃=[b c d a]

As can be seen that above OCC rotation pattern is the form of a cyclic shift, it is also possible to it is easily verified that the OCC rotation patterns based on this example also eliminate the problem of the power jitter between distinct symbols, and do not change the rotation pattern of the port 7/8 defined in R12.

As DMRS enhancement techniques have in a PRB of each OFDM symbolThe situation of individual RE, the method for column permutation can only can be only achieved power equalization in the PRB of the integral multiple that number is 4.This also requires that certain restriction in selectivity of channel frequency, it is, requiring that channel frequency selects characteristic basically identical in 4 PRB.In order to solve this problem, another kind of solution based on frequency dependence code is we have proposed, the above-mentioned scheme based on column permutation can be mitigated for the requirement of selectivity of channel frequency.

Scheme based on frequency dependence code：

In this programme, in step S401, the OCC on the corresponding subcarrier of the described pair of available DMRS antenna port carry out pattern round-robin processing the step of include：

- the M DMRS OCC rotation pattern such as following formula will be used on available DMRS antenna ports corresponding subcarrier：

{diag{f₀}W, diag{f₁}W, …, diag{f_M-1}W}

Wherein, diag { f_mRepresent with vector f_mFor the diagonal matrix of diagonal element

Wherein, f_m=[f_m,0 f_m,1 f_m,2 f_m,3], m=0 ... .M -1 meets F^HF=I, wherein

For this programme is expanded on further, the expression way that we first provide current OCC rotation pattern [a b c d] and [d c b a] is as follows.

Wherein, f₀=[1 11 1], f₁=[1-1-1 1].Above expression formula can represent the rotation pattern that current R12 versions are used.For the transport layer on each antenna port, there are different frequency dependence codes.For example, [1 1] are that, for antenna port 7/13, [1-1] is corresponding to antenna port 8/11.So as to the transmission power of first OFDM symbol can be expressed as：

Wherein,Investigate following condition F^HF=I (5)

If it is obvious that to F without special it is assumed thatDepend on vectorial a.If above-mentioned formula (5) can be met, i.e., all it is mutually orthogonal between the row of F matrix, then we are obtained using the constant modulus property of element in aThat is,The OCC code a of time domain are not relied on.This result forWithAnd it is same.In other words, work as F^HF=I, four DMRS intersymbols of a sub- frame in have identical transmission power.

The OCC patterns of this programme as shown in figure 3, wherein, in order that F^HEffectively, M should be greater than equal to 4 F=I.

Below with two examples further illustrating this programme：

Example 3 ：

Preferably, in order to be able to compatible conventional user equipment, the OCC patterns on 7/8 corresponding subcarrier of port must be consistent with the pattern of current R12.Therefore front 2 row of matrix F are necessary for：

For example, as M=6, F matrix is set to：

Wherein, t=e^{-j π /3}。

Use above F matrix, due to the first two columns of F matrix it is identical with the OCC patterns of existing R12 versions, therefore can in DMRS enhancement techniques compatibility R12 and more older version user equipment, while eliminate DMRS residing for OFDM symbol between unbalanced power problem.

Example 4:

Work as M=9, F matrix is set to：

Wherein, s=e^{-j2 π /9}。

Think above F matrix only have first row it is identical with the OCC patterns of existing R12 versions, therefore can only on antenna port 7 in DMRS enhancement techniques compatibility R12 and more older version user equipment.

Fig. 5 illustrates the method for process signal in the user equipment based on LTE according to a further aspect of the invention.Wherein, as shown in Figure 5：

In step S501, user equipment is demodulated process to the OFDM symbol from base station, to obtain the data block Jing after OFDM demodulation；

Subsequently, in step S502, user equipment carries out processing the process of contrary with the above-mentioned pattern rotation in the base station based on LTE protocol with reference to described by Fig. 3 to the OCC on subcarrier corresponding with available DMRS antenna ports in the data block Jing after OFDM demodulation.

Namely, in order to solve the problems, such as present in the DMRS enhancement techniques of existing LTE protocol unbalanced power between OFDM symbol, base station of the invention is by can use the OCC patterns on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, subsequently again to carrying out OFDM modulation Jing the data block after pattern rotation process is carried out to OCC comprising described, OFDM symbol is generated, for being transmitted.Correspondingly, user equipment of the invention need to carry out processing the process of contrary with the above-mentioned pattern rotation in the base station based on LTE protocol with reference to described by Fig. 3 to the OCC on the subcarrier corresponding with available DMRS antenna ports in the data block Jing after OFDM demodulation of base station, could reduce the OCC on original subcarrier corresponding with available DMRS antenna ports.Because, to those skilled in the art, it is easy to the process of contrary therewith is derived in a kind of known processing procedure, therefore be will not be described here.

For processing the device of DMRS signals in a kind of base station based on LTE protocol that Fig. 6 shows according to one aspect of the invention, wherein, as shown in figure 4, including：

Pattern round-robin processing device 601, for can use the OCC on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, to reduce the unbalanced power between the OFDM symbol for subsequently generating；

OFDM modulating devices 602, for carrying out OFDM modulation Jing the data block after pattern rotation process is carried out to OCC comprising described, generating OFDM symbol.

Namely, in order to solve the problems, such as present in the DMRS enhancement techniques of existing LTE protocol unbalanced power between OFDM symbol, base station of the invention is by can use the OCC patterns on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, subsequently OFDM symbol is generated to carrying out OFDM modulation Jing the data block after pattern rotation process is carried out to OCC comprising described again.

Specifically, above-mentioned pattern rotation processing procedure include but is not limited in pattern to DMRS using OCC rotation pattern carry out a certain degree of conversion, such as conversion based on column permutation and frequency dependence code.Two kinds of implementations of the conversion based on column permutation and frequency dependence code are given individually below.

Scheme based on column permutation：

In this programme, the pattern round-robin processing device 601 specifically for：

- to can use the M=4 DMRS OCC rotation pattern provided using equation below on the corresponding subcarrier of DMRS antenna ports：：

{WE₀,WE₁,WE₂,WE₃} (1)

Wherein, E_i4x4 permutation matrix, i.e. E_iEvery string all differ, and from in following collection select：

And meet following condition：

Below to specify in current LTE protocol for DMRS as a example by enhanced 4 antenna ports 7/8/11/13, scheme of the above based on column permutation is further illustrated with two examples：

Example 1 ：

Wherein, E_iFor：

Obviously, E_iMeet the condition of above formula (2), then as shown in Fig. 2 the rotation rotation pattern of OCC is：

WE₀=[a b c d]

WE₁=[d c b a]

WE₂=[c d a b]

WE₃=[b a d c]

Here, as shown by the following formula, we can be with it is easily verified that the intersymbol transmission powers of DMRS in this example Jing after column permutation be identical.

If PRB numbers are 4 integral multiples, the postrotational DMRS OCC patterns (hereinafter referred to as " OCC patterns ") based on this example eliminate the problem of the power jitter between distinct symbols.Above-mentioned postrotational OCC patterns are updated in original walsh matrixes, can be seen in this example, to remain in that on port 7/8 and pattern is rotated with R12 versions identicalOCC patterns on port 11/13 are transformed to：

As a kind of preferred version, as the OCC patterns on port 7/8 do not change, thus the example can in DMRS enhancement techniques compatibility R12 and more older version user equipment.

In general, in addition to example 1, if the user equipment of R12 and more older version will be supported in DMRS enhancement techniques, to E_iAnother restrictive condition for selecting is to ensure that the OCC rotation patterns of port 7/8 are identical with OCC patterns specified in R12 agreements.

Example 2 ：

In this example, E_iFor：

Similarly, E_iAlso meet the condition of formula (2).OCC rotates pattern：

WE₀=[a b c d]

WE₁=[d a b c]

WE₂=[c d a b]

WE₃=[b c d a]

As can be seen that above OCC rotation pattern is the form of a cyclic shift, it is also possible to it is easily verified that the OCC rotation patterns based on this example also eliminate the problem of the power jitter between distinct symbols, and do not change the rotation pattern of the port 7/8 defined in R12.

As DMRS enhancement techniques have in a PRB of each OFDM symbolThe situation of individual RE, the method for column permutation can only can be only achieved power equalization in the PRB of the integral multiple that number is 4.This also requires that certain restriction in selectivity of channel frequency, it is, requiring that channel frequency selects characteristic basically identical in 4 PRB.In order to solve this problem, another kind of solution based on frequency dependence code is we have proposed, the above-mentioned scheme based on column permutation can be mitigated for the requirement of selectivity of channel frequency.

Scheme based on frequency dependence code：

In this programme, the pattern round-robin processing 601 specifically for：

- the M DMRS OCC rotation pattern such as following formula will be used on available DMRS antenna ports corresponding subcarrier：

{diag{f ₀}W,diag{f₁}W,…,diag{ f_M-1W },

Wherein, diag { f_mRepresent with vector f_mFor the diagonal matrix of diagonal element

Wherein, f_m=[f_m,0 f_m,1 f_m,2 f_m,3, m=0 ... .M-1 meets

F^HF=I, wherein

For this programme is expanded on further, the expression way that we first provide current OCC rotation pattern [a b c d] and [d c b a] is as follows：

Wherein, f₀=[1 11 1], f₁=[1-1-1 1].Above expression formula can represent the rotation pattern that current R12 is used.For the transport layer on each antenna port, there are different frequency dependence codes.For example, [1 1] are that, for antenna port 7/13, [1-1] is corresponding to antenna port 8/11.So as to the transmission power of first OFDM symbol can be expressed as：

Wherein,Investigate following condition F^HF=I (5)

If it is obvious that to F without special it is assumed thatDepend on vectorial a.If above-mentioned formula (5) can be met, i.e., all it is mutually orthogonal between the row of F matrix, then we are obtained using the constant modulus property of element in aThat is,The OCC code a of time domain are not relied on.This result forWithAnd it is same.In other words, work as F^HF=I, four DMRS intersymbols of a sub- frame in have identical transmission power.

The OCC patterns of this programme as shown in figure 3, wherein, in order that F^HEffectively, M should be greater than equal to 4 F=I.

Below with two examples further illustrating this programme：

Example 3 ：

Preferably, in order to be able to compatible conventional user equipment, the OCC patterns on 7/8 corresponding subcarrier of port must be consistent with the pattern of current R12.Therefore front 2 row of matrix F are necessary for：

For example, as M=6, F matrix is set to：

Wherein, t=e^{-j π /3}。

Use above F matrix, due to the first two columns of F matrix and the DMRS OCC patterns of existing R12 it is identical, therefore can in DMRS enhancement techniques compatibility R12 and more older version user equipment, while eliminate DMRS residing for OFDM symbol between unbalanced power problem.

Example 4:

Work as M=9, F matrix is set to：

Wherein, s=e^{-j2 π /9}。

Think above F matrix only have first row it is identical with the OCC patterns of existing R12, therefore can only on antenna port 7 in DMRS enhancement techniques compatibility R12 and more older version user equipment.

Fig. 7 illustrates the device of process signal in the user equipment based on LTE according to a further aspect of the invention, wherein, as shown in figure 5, including：

OFDM demodulation device, for being demodulated process to the OFDM symbol from base station, to obtain the data block Jing after OFDM demodulation；

Pattern rotation inversely processing device, for carrying out the process of contrary is processed with the above-mentioned pattern rotation in the base station based on LTE protocol with reference to described by Fig. 3 to the OCC on subcarrier corresponding with available DMRS antenna ports in the data block Jing after OFDM demodulation.

Namely, in order to solve the problems, such as present in the DMRS enhancement techniques of existing LTE protocol unbalanced power between OFDM symbol, base station of the invention is by can use the OCC patterns on the corresponding subcarrier of DMRS antenna ports to carry out pattern round-robin processing, subsequently again to carrying out OFDM modulation Jing the data block after pattern rotation process is carried out to OCC comprising described, OFDM symbol is generated, for being transmitted.Correspondingly, user equipment of the invention need to carry out processing the process of contrary with the above-mentioned pattern rotation in the base station based on LTE protocol with reference to described by Fig. 3 to the OCC on the subcarrier corresponding with available DMRS antenna ports in the data block Jing after OFDM demodulation of base station, could reduce the OCC on original subcarrier corresponding with available DMRS antenna ports.Because, to those skilled in the art, it is easy to the process of contrary therewith is derived in a kind of known processing procedure, therefore be will not be described here.

It should be noted that the present invention can be carried out in the assembly of software and/or software with hardware, for example, each device of the present invention can adopt special IC (ASIC) or any other similar hardware device to realize.In one embodiment, software program of the invention can pass through computing device to realize steps described above or function.Similarly, software program of the invention (including related data structure) can be stored in computer readable recording medium storing program for performing, for example, RAM memory, magnetically or optically driver or floppy disc and similar devices.In addition, some steps or function of the present invention can employ hardware to realize, for example, as coordinating so as to perform the circuit of each step or function with processor.

It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and without departing from the spirit or essential characteristics of the present invention, the present invention can be realized in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by claims rather than described above is limited, it is intended that all changes in the implication and scope of the equivalency of claim that will fall are included in the present invention.Any reference in claim should not be considered as and limit involved claim.Furthermore, it is to be understood that " including " word is not excluded for other units or step, odd number is not excluded for plural number.The multiple units stated in system claims or device can also be realized by software or hardware by a unit or device.The first, the second grade word is used for representing title, and is not offered as any specific order.

Although above specifically shown and describe exemplary embodiment, it will be appreciated by those skilled in the art that in the case of the spirit and scope without departing substantially from claims, can be varied from terms of its form and details.Protection sought herein is illustrated in the dependent claims.

Claims (20)

1. a kind of method for being used for processing DMRS signals in base station based on LTE protocol, its In, the method also includes before OFDMA modulation is carried out：

- to can use the OCC on the corresponding subcarrier of DMRS antenna ports to carry out at pattern rotation Reason, to reduce the unbalanced power between the OFDM symbol for subsequently generating.

2. the method for claim 1, the corresponding subcarrier of the described pair of available DMRS antenna port On OCC include the step of carry out pattern round-robin processing：

- be given using equation below on the corresponding subcarrier of available DMRS antenna ports M=4 DMRS OCC rotates pattern：

{WE₀,WE₁,WE₂,WE₃}

Wherein, W is walsh matrix

$W=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& -1& +1& -1\\ +1& +1& -1& -1\\ +1& -1& -1& +1\end{array}\right]$

E_i4x4 permutation matrix, i.e. E_iEvery string all differ, and from following collection Middle selection：

$\{\left[\begin{array}{c}1\\ 0\\ 0\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 1\\ 0\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 0\\ 1\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 0\\ 0\\ 1\end{array}\right]\},$

And meet following condition：

$E_0+E_1+E_2+E_3=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& 1& 1& 1\\ 1& 1& 1& 1\\ 1& 1& 1& 1\end{array}\right]\·$

。

3. the method for claim 2, wherein, E_iFor：

$E_0=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right],E_1=\left[\begin{array}{cccc}0& 0& 0& 1\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 1& 0& 0& 0\end{array}\right],E_2=\left[\begin{array}{cccc}0& 0& 1& 0\\ 0& 0& 0& 1\\ 1& 0& 0& 0\\ 0& 1& 0& 0\end{array}\right],E_3=\left[\begin{array}{cccc}0& 1& 0& 0\\ 1& 0& 0& 0\\ 0& 0& 0& 1\\ 0& 0& 1& 0\end{array}\right]$

。

4. the method for claim 2, wherein, E_iFor：

$E_0=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right],E_1=\left[\begin{array}{cccc}0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 1& 0& 0& 0\end{array}\right],E_2=\left[\begin{array}{cccc}0& 0& 1& 0\\ 0& 0& 0& 1\\ 1& 0& 0& 0\\ 0& 1& 0& 0\end{array}\right],E_3=\left[\begin{array}{cccc}0& 0& 0& 1\\ 1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\end{array}\right]$

。

5. the method for claim 1 wherein, described pair of available DMRS antenna port is corresponding The step of OCC on subcarrier carries out pattern round-robin processing includes：

- individual using the M such as following formula on the corresponding subcarrier of available DMRS antenna ports DMRS OCC rotation patterns：

{diag{f₀}W,diag{f₁}W,…,diag{f_M-1}W}

Wherein, diag { f_mRepresent with vector_mFor the diagonal matrix of diagonal element；

Wherein, W is walsh matrix：

$W=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& -1& +1& -1\\ +1& +1& -1& -1\\ +1& -1& -1& +1\end{array}\right]$

f_m=[ f_m,0 f_m,1 f_m,2 f_m,3, M=0 ... .M-1 meets

F^HF=I, wherein

$F=\left[\begin{array}{c}\begin{array}{cccc}{f}_{0,0}& f_{0,1}& f_{0,2}& f_{0,3}\end{array}\\ \begin{array}{cccc}{f}_{1,0}& f_{1,1}& f_{1,2}& f_{1,3}\end{array}\\ \begin{array}{c}.\\ .\\ .\end{array}\\ \begin{array}{cccc}{f}_{M-1,0}& f_{M-1,1}& f_{M-1,2}& f_{M-1,3}\end{array}\end{array}\right].$

。

6. method as claimed in claim 5, wherein, F meets following condition：

Front the 2 of F are classified as：

$F(:,1:2)=\left[\begin{array}{cc}+1& +1\\ +1& -1\\ \begin{array}{c}.\\ .\\ .\end{array}& \begin{array}{c}.\\ .\\ .\end{array}\\ +1& +1\\ +1& -1\end{array}\right].$

7. method as claimed in claim 5, wherein, M is that 6, F meets following condition：

$F=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& -1& t^1& t^2\\ +1& +1& t^2& t^4\\ +1& -1& t^3& t^6\\ +1& +1& t^4& t^8\\ +1& -1& t^5& t^{10}\end{array}\right]\·$

Wherein, t=e^-jπ/3。

8. method as claimed in claim 5, wherein, M is that 9, F meets following condition：

$F=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& s^1& s^2& s^3\\ +1& s^2& s^4& s^6\\ +1& s^3& s^6& s^9\\ +1& s^4& s^8& s^{12}\\ +1& s^5& s^{10}& s^{15}\\ +1& s^6& s^{12}& s^{18}\\ +1& s^7& s^{14}& s^{21}\\ +1& s^8& s^{16}& s^{24}\end{array}\right].$

Wherein, s=e^-j2π/9。

9. method according to any one of claim 1 to 8, wherein, the available DMRS Antenna port includes port 7,8,11 and 13.

10. a kind of method that DMRS signals are processed in user equipment based on LTE, wherein, Including：

To sub- load corresponding with available DMRS antenna ports in the data block Jing after OFDM demodulation OCC on ripple carries out processing the process of contrary with the pattern rotation in claim 1-9.

It is used for processing the device of DMRS signals in a kind of 11. base stations based on LTE protocol, Wherein, before OFDMA modulation is carried out, the device also includes：

Pattern round-robin processing device, for the corresponding subcarrier of available DMRS antenna ports OCC carry out pattern round-robin processing, to reduce the power between the OFDM symbol that subsequently generates not Balance.

The device of 12. claim 1, wherein, the pattern round-robin processing device specifically for：

The M=4 be given using equation below on the corresponding subcarrier of available DMRS antenna ports Individual DMRS OCC rotate pattern：

{WE₀,WE₁,WE₂,WE₃}

Wherein, wherein, W is walsh matrix：

$W=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& -1& +1& -1\\ +1& +1& -1& -1\\ +1& -1& -1& +1\end{array}\right]$

E_i4x4 permutation matrix, i.e. E_iEvery string all differ, and from following collection Middle selection：

$\{\left[\begin{array}{c}1\\ 0\\ 0\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 1\\ 0\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 0\\ 1\\ 0\end{array}\right],\left[\begin{array}{c}0\\ 0\\ 0\\ 1\end{array}\right]\},$

And meet following condition：

$E_0+E_1+E_2+E_3=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& 1& 1& 1\\ 1& 1& 1& 1\\ 1& 1& 1& 1\end{array}\right]\·$

。

The device of 13. claim 12, wherein, E_iFor：

$E_0=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right],E_1=\left[\begin{array}{cccc}0& 0& 0& 1\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 1& 0& 0& 0\end{array}\right],E_2=\left[\begin{array}{cccc}0& 0& 1& 0\\ 0& 0& 0& 1\\ 1& 0& 0& 0\\ 0& 1& 0& 0\end{array}\right],E_3=\left[\begin{array}{cccc}0& 1& 0& 0\\ 1& 0& 0& 0\\ 0& 0& 0& 1\\ 0& 0& 1& 0\end{array}\right]$

。

The device of 14. claim 12, wherein, E_iFor：

$E_0=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right],E_1=\left[\begin{array}{cccc}0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 1& 0& 0& 0\end{array}\right],E_2=\left[\begin{array}{cccc}0& 0& 1& 0\\ 0& 0& 0& 1\\ 1& 0& 0& 0\\ 0& 1& 0& 0\end{array}\right],E_3=\left[\begin{array}{cccc}0& 0& 0& 1\\ 1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\end{array}\right]$

。

The device of 15. claim 11, wherein, the pattern round-robin processing device specifically for：

Using such as M DMRS of following formula on the corresponding subcarrier of available DMRS antenna ports OCC rotation patterns：

{diag{f₀}W , diag{f₁}W, …, diag{f_M-1}W}

Wherein, diag { f_m} Represent with vector_mFor the diagonal matrix of diagonal element；

Wherein, W is walsh matrix：

$W=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& -1& +1& -1\\ +1& +1& -1& -1\\ +1& -1& -1& +1\end{array}\right]$

f_m= [f_m,0 f _m,1 f _m,2 f _m,3], m=0 ... .M-1 meets

F^HF=I, wherein

$F=\left[\begin{array}{c}\begin{array}{cccc}{f}_{0,0}& f_{0,1}& f_{0,2}& f_{0,3}\end{array}\\ \begin{array}{cccc}{f}_{1,0}& f_{1,1}& f_{1,2}& f_{1,3}\end{array}\\ \begin{array}{c}.\\ .\\ .\end{array}\\ \begin{array}{cccc}{f}_{M-1,0}& f_{M-1,1}& f_{M-1,2}& f_{M-1,3}\end{array}\end{array}\right].$

。

16. devices as claimed in claim 15, wherein, F meets following condition：

Front the 2 of F are classified as：

$F(:,1:2)=\left[\begin{array}{cc}+1& +1\\ +1& -1\\ \begin{array}{c}.\\ .\\ .\end{array}& \begin{array}{c}.\\ .\\ .\end{array}\\ +1& +1\\ +1& -1\end{array}\right]$

17. devices as claimed in claim 15, wherein, M is that 6, F meets following condition：

$F=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& -1& t^1& t^2\\ +1& +1& t^2& t^4\\ +1& -1& t^3& t^6\\ +1& +1& t^4& t^8\\ +1& -1& t^5& t^{10}\end{array}\right].$

Wherein, t=e^-jπ/3。

18. devices as claimed in claim 15, wherein, M is that 9, F meets following condition：

$F=\left[\begin{array}{cccc}+1& +1& +1& +1\\ +1& s^1& s^2& s^3\\ +1& s^2& s^4& s^6\\ +1& s^3& s^6& s^9\\ +1& s^4& s^8& s^{12}\\ +1& s^5& s^{10}& s^{15}\\ +1& s^6& s^{12}& s^{18}\\ +1& s^7& s^{14}& s^{21}\\ +1& s^8& s^{16}& s^{24}\end{array}\right].$

Wherein, s=e^-j2π/9。

19. devices according to any one of claim 11 to 18, wherein, it is described available DMRS antenna ports include port 7,8,11 and 13.

The device of DMRS signals is processed in a kind of 20. user equipmenies based on LTE, wherein, Including：

Pattern rotation inversely processing device, in the data block Jing after OFDM demodulation with it is available OCC on the corresponding subcarrier of DMRS antenna ports carry out with claim 11-19 Pattern rotation process contrary process.