CN106559193B - The method and apparatus that DMRS signal is handled in a wireless communication system - Google Patents

The method and apparatus that DMRS signal is handled in a wireless communication system Download PDF

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Publication number
CN106559193B
CN106559193B CN201510622983.7A CN201510622983A CN106559193B CN 106559193 B CN106559193 B CN 106559193B CN 201510622983 A CN201510622983 A CN 201510622983A CN 106559193 B CN106559193 B CN 106559193B
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dmrs
occ
pattern
processing
antenna port
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CN106559193A (en
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张晴川
张闽
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A Er Katelangxun
Nokia Shanghai Bell Co Ltd
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A Er Katelangxun
Nokia Shanghai Bell Co Ltd
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Priority to CN201510622983.7A priority Critical patent/CN106559193B/en
Priority to PCT/IB2016/001512 priority patent/WO2017051255A2/en
Priority to TW105130919A priority patent/TW201724788A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
    • H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
    • H04J2211/005—Long term evolution [LTE]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals

Abstract

The present invention relates to the method and apparatus in a kind of base station based on LTE protocol and user equipment for handling DMRS signal, the method of one aspect according to the present invention, including providing a kind of method in the base station based on LTE protocol for handling DMRS signal, wherein, this method is before carrying out OFDMA modulation further include:-pattern round-robin processing is carried out to the OCC on the corresponding subcarrier of available DMRS antenna port, to reduce the unbalanced power between the OFDM symbol subsequently generated.Imbalance problem between existing OFDM symbol can be eliminated or reduce according to the solution of the present invention in existing LTE protocol under DMRS enhancing technology.

Description

The method and apparatus that DMRS signal is handled in a wireless communication system
Technical field
The present invention relates to wireless communication techniques, more particularly to solution in the wireless communication system based on long term evolution (LTE) The method and apparatus for adjusting reference signal (DMRS) signal to be handled.
Background technique
In LTE R13 agreement, third generation partner program (3GPP) tissue has determined to consider to enhance using DMRS Technology is preferably to support descending multi-user-multiple-input, multiple-output (MU-MIMO).In this regard, in technical report TR36.897 It proposes some alternatives, supports expanded downstream DMRS, for reducing interfering with each other between DMRS port.
Wherein, in the alternative 1 that current 3GPP is proposed, orthogonal covering codes (OCC, Orthogonal Cover Code 12 resource cells (RE, Resource Element))=4 and at each Physical Resource Block (PRB) are used, i.e., existing Having is enhanced on the basis of antenna port 7,8,11,13, and this mode has several advantages, such as least reference signal (RS) Expense, not additional RE punching is invisible to the operation of MU, therefore is probably supported by 3GPP.However, current DMRS figure Sample can make have the problem of power jitter between OFDM symbol of the alternative 1 locating for DMRS.This namely so-called power is not The problem of balance, this is to need to be avoided when using reference signal design.In order to solve this problem, the present invention proposes one kind This problem is solved using the scheme of novel OCC pattern based on the DMRS port for extension.
In current LTE protocol, there are two types of OCC pattern is as follows:
Wherein, p is antenna end slogan；
In the alternative 1 of above-mentioned TR36.897, both OCC patterns with the 7th, 8,11,13 antenna ports it is corresponding DMRS subcarrier on alternately be recycled.The following Walsh of the sequence definition that each port uses (Walsh) conversion code:
If we are rewritten as following walsh matrix
Then rotate patternandIt can be expressed as [a b c d] and [d c b a] accordingly.Assuming that having Four multi-user's layers (MU layers), can be expressed as z in the relevant precoding weight of n-th of transmitting antenna of the side eNBn =[zn,1 zn,2 zn,3 zn,4]TSo, as shown in Figure 1, in a subframe in four DMRS OFDM symbols n-th hair The transmission power for penetrating antenna is respectively as follows:
Due to precoding vector znDependent on channel condition, so as to each not phase of the DMRS transmission powers of above four symbols Together.Worst situation is znWith { a, b, c, d } one of sequences match.For example, if zn=a=[+1+1+1+1]T, that ?and This will lead to the power jitter between OFDM symbol, lead Cause the unbalanced power between OFDM symbol.
Summary of the invention
The purpose of the present invention is to solve uneven between existing OFDM symbol under DMRS enhancing technology in existing LTE protocol Weighing apparatus problem.
According to the first aspect of the invention, provide it is a kind of in the base station based on LTE protocol for handling DMRS signal Method, wherein this method is before carrying out OFDMA modulation further include:
Pattern round-robin processing is carried out to the OCC on the corresponding subcarrier of available DMRS antenna port, is subsequently generated with reducing OFDM symbol between unbalanced power.
According to the second aspect of the invention, a kind of side that DMRS signal is handled in the user equipment based on LTE is provided Method, wherein include:
To on subcarrier corresponding with available DMRS antenna port in the data block after OFDM demodulation OCC carry out and root According to the processing of the pattern rotation processing contrary in the method for first aspect present invention.
According to the third aspect of the invention we, provide it is a kind of in the base station based on LTE protocol for handling DMRS signal Device, wherein before carrying out OFDMA modulation, the device further include:
Pattern round-robin processing device, for carrying out pattern wheel to the OCC on the corresponding subcarrier of available DMRS antenna port Turn processing, to reduce the unbalanced power between the OFDM symbol subsequently generated.
According to the fourth aspect of the invention, a kind of dress that DMRS signal is handled in the user equipment based on LTE is provided It sets, wherein include:
Pattern rotation inversely processing device, for corresponding with available DMRS antenna port in the data block after OFDM demodulation Subcarrier on OCC carry out the place with the pattern rotation processing contrary in the aforementioned base station according to a third aspect of the present invention Reason.
Existing OFDM symbol under DMRS enhancing technology can be eliminated or reduce according to the solution of the present invention in existing LTE protocol Imbalance problem between number.
Detailed description of the invention
Will be more fully understood the present invention by the detailed description and the accompanying drawings forth below, wherein identical unit by Identical appended drawing reference indicates that attached drawing is merely possible to what explanation provided, therefore is not intended to limit the invention, and its In:
Fig. 1 shows OCC in the Current protocols according to LTE R12 agreement and rotates pattern；
It is obtained after what Fig. 2 shows according to an embodiment of the invention based on column permutation handle DMRS signal OCC rotates pattern；
Fig. 3, which is shown, to be obtained after handling DMRS based on frequency dependence code according to another embodiment of the present invention OCC rotates pattern；
Fig. 4 shows the method flow diagram that DMRS signal is handled in the base station based on LTE of one aspect according to the present invention；
Fig. 5 shows the method stream that DMRS signal is handled in the user equipment based on LTE according to a further aspect of the invention Cheng Tu；
Fig. 6 shows the device block diagram that DMRS signal is handled in the base station based on LTE of one aspect according to the present invention；
Fig. 7 shows the device frame that DMRS signal is handled in the user equipment based on LTE according to a further aspect of the invention Figure；
It should be mentioned that these attached drawing meant for illustration utilized in some of the exemplary embodiments method, structure and/ Or the general characteristic of material, and supplement is made to the written description provided below.But these attached drawings are not necessarily drawn to scale And it may not reflect the accurate structure or performance characteristics of any given embodiment accurately, and should not be explained At the range of numerical value or attribute that definition or limitation are covered by exemplary embodiment.In each picture using similar or complete Identical appended drawing reference is the presence in order to show similar or identical unit or feature.
Specific embodiment
Although exemplary embodiment can be shown by way of example in the accompanying drawings there are many modification and alternative forms Some of which embodiment, and will be described in detail herein.It should be understood, however, that being not intended to show Example property embodiment is restricted to disclosed concrete form, on the contrary, exemplary embodiment intention covers the model for falling in claims Enclose interior all modifications, equivalent scheme and alternative.Identical appended drawing reference refers to identical always in the description of each width figure Unit.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail The processing or method described as flow chart.Although operations are described as the processing of sequence by flow chart, therein to be permitted Multioperation can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of operations can be rearranged.When it The processing can be terminated when operation completion, it is also possible to have the additional step being not included in attached drawing.The processing It can correspond to method, function, regulation, subroutine, subprogram etc..
Term " wireless device " used herein above or " equipment " can be considered as synonymous with the following terms and later In can be referred to as the following terms sometimes: it is client, user equipment, movement station, mobile subscriber, mobile terminal, subscriber, user, remote Journey station, access terminal, receiver, mobile unit etc., and the long-range of radio resource in cordless communication network can be described User.
Similarly, term " base station " used herein above can be considered as synonymous with the following terms and below sometimes It can be referred to as the following terms: B node, evolved B node, eNodeB, base transceiver stations (BTS), RNC etc., and can be with Description communicates with mobile terminal in the cordless communication network that can cross over multiple technology generations and is provided radio resource Transceiver.Other than implementing the ability of method discussed herein, base station discussed herein be can have and traditional crowd The associated institute in well known base station is functional.
Method (some of them are illustrated by process) discussed hereafter can be by hardware, software, firmware, centre Part, microcode, hardware description language or any combination thereof are implemented.Implement when with software, firmware, middleware or microcode When, program code or code segment to implement necessary task can be stored in machine or computer-readable medium and (for example deposit Storage media) in.Necessary task can be implemented in (one or more) processor.
Specific structure and function details disclosed herein are only representative, and are for describing the present invention show The purpose of example property embodiment.But the present invention can be implemented by many alternative forms, and be not interpreted as It is limited only by the embodiments set forth herein.
Although it should be understood that may have been used term " first ", " second " etc. herein to describe each unit, But these units should not be limited by these terms.The use of these items is only for by a unit and another unit It distinguishes.For example, without departing substantially from the range of exemplary embodiment, it is single that first unit can be referred to as second Member, and similarly second unit can be referred to as first unit.Term "and/or" used herein above include one of them or Any and all combinations of more listed associated items.
It should be understood that when a unit referred to as " connects " or when " coupled " to another unit, can directly connect Another unit is connect or be coupled to, or may exist temporary location.In contrast, " directly connect when a unit is referred to as Connect " or " direct-coupling " to another unit when, then temporary location is not present.It should explain in a comparable manner and be used to retouch State the relationship between unit other words (such as " between being in ... " compared to " between being directly in ... ", " and with ... it is adjacent Closely " compared to " 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 Context clearly refers else, otherwise singular used herein above "one", " one " also attempt to include plural number.Also answer When understanding, term " includes " and/or "comprising" used herein above provide stated feature, integer, step, operation, The presence of unit and/or component, and do not preclude the presence or addition of other one or more features, integer, step, operation, unit, Component and/or combination thereof.
It should further be mentioned that the function action being previously mentioned can be attached according to being different from some replace implementations The sequence indicated in figure occurs.For example, related function action is depended on, the two width figures shown in succession actually may be used Substantially simultaneously to execute or can execute in a reverse order sometimes.
Unless otherwise defined, otherwise all terms (including technical and scientific term) used herein all have with it is exemplary The identical meaning that technical staff in embodiment fields is generally understood.It is to be further understood that unless herein by It explicitly defines, otherwise such as those terms defined in usually used dictionary should be construed as having to it in related neck The consistent meaning of meaning in the context in domain, without that should be explained according to Utopian or too formal meaning.
The some parts of exemplary embodiment and corresponding detailed description are by software in computer storage or calculation Method and for data bit operation symbol indicate and provide.These descriptions and expression be those skilled in the art to The description and expression of its work essence are effectively conveyed to others skilled in the art.As being typically used it, Term " algorithm " used herein above is envisaged as obtaining the self-congruent sequence of steps of desired result.The step is It needs to carry out physical magnitude those of physical manipulation step.Usually rather than it is necessary that these quantity take can be stored, The form of the optics, electric or magnetic signal that transmit, combine, compare and be manipulated otherwise.Primarily for usual The reason of use, it has proved that be sometimes just these signals as bits, numerical value, element, symbol, character, item, number etc. Benefit.
By the symbol referring to movement and the operation that may be implemented as program module or function treatment in description below Number indicate (such as in a flowchart) to describe illustrative embodiments, described program module or function treatment include implement it is special Determine task or implement the routine of particular abstract data type, programs, objects, component, data structure etc., and can use Existing hardware at existing network unit is implemented.Such existing hardware may include one or more central processing unit (CPU), digital signal processor (DSP), specific integrated circuit, field programmable gate array (FPGA) computer etc..
But it would be recognized that all these and similar terms should be associated with physical magnitude appropriate, and It is only the convenience label for being applied to these quantity.Unless clearly Stated otherwise or from discussion, it is apparent that Otherwise such as terms such as " processing ", " calculating ", " determination " or " display " refer to that computer system or the calculating of similar electronics are set Standby movement and processing, to physics, the electron amount in the register and memory for being represented as the computer system Data are manipulated, and be converted into be similarly represented as the computer system memory or register or other Other data of this type of information storage, transmission or the physical magnitude in display equipment.
It should further be mentioned that being typically encoded in some form of program in terms of the software implementation of exemplary embodiment Implement on storage medium or by certain type of transmission medium.Described program storage medium can be magnetic (such as soft 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, coaxial cable, optical fiber or in the art Certain known other transmission medium appropriate.The exemplary embodiment not limit in terms of by these of any given implementation System.
Processor and memory can carry out running gear function with a biconditional operation.For example, memory can store about The code segment of apparatus function.The code segment can be executed again by processor.In addition, memory can store processing variable and often Number device for processing uses.
Fig. 4, which shows a kind of of one aspect according to the present invention, to be believed in the base station based on LTE protocol for handling DMRS Number method.Wherein, as shown in Figure 4:
In step S401, base station carries out at pattern rotation the OCC on the corresponding subcarrier of available DMRS antenna port Reason, to reduce the unbalanced power between the OFDM symbol subsequently generated；
Then in step S402, base station is carried out to comprising described through carrying out pattern rotation treated data block to OCC OFDM modulation, generates OFDM symbol.
That is, in order to solve unbalanced power between OFDM symbol present in the DMRS enhancing technology of existing LTE protocol Problem, base station according to the present invention is by carrying out pattern wheel to the OCC pattern on the corresponding subcarrier of available DMRS antenna port Turn processing, then carries out OFDM modulation through carrying out pattern rotation treated data block to OCC to comprising described again, generate OFDM Symbol.
Specifically, above-mentioned pattern rotation treatment process includes but is not limited to the OCC rotation figure used in pattern DMRS Sample carries out a degree of transformation, such as the transformation based on column permutation and frequency dependence code.It is provided individually below based on column permutation With two kinds of implementations of the transformation of frequency dependence code.
Scheme based on column permutation:
In step S401, the OCC on the corresponding subcarrier of described pair of available DMRS antenna port is carried out at pattern rotation Reason the step of include:
It is rotated on the corresponding subcarrier of available DMRS antenna port using the M=4 DMRS OCC that following formula provides Pattern:
{WE0,WE1,WE2,WE3} (1)
Wherein, EiIt is a 4x4 permutation matrix, i.e. EiEach column be all different, and selected from following collection:
And meet the following conditions:
Below for specifying 4 antenna ports 7/8/11/13 for DMRS enhancing in current LTE protocol, with two Example further illustrates scheme above based on column permutation:
Example 1:
Wherein, EiAre as follows:
Obviously, EiMeet the condition of above formula (2), then as shown in Fig. 2, OCC rotation pattern are as follows:
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 it is easily verified that the DMRS symbol after column permutation in this example Between transmission power it is identical.
If PRB number is 4 integral multiple, based on this exemplary postrotational DMRS OCC pattern (hereinafter referred to as " OCC Pattern ") the problem of eliminating the power jitter between distinct symbols.Above-mentioned postrotational OCC pattern is updated to original walsh square In battle array, it can be seen that, port 7/8 still maintains rotation pattern identical with R12 in this examplePort DMRS OCC pattern transformation on 11/13 are as follows:
As a preferred embodiment, since the OCC pattern on port 7/8 does not change, which can be in DMRS Compatible R12 and the user equipment of more older version in enhancing technology.
In general, other than example 1, if to support the user of R12 and more older version in DMRS enhancing technology Equipment, to EiAnother restrictive condition of selection is to guarantee that the OCC rotation pattern of port 7/8 is schemed with OCC specified in R12 agreement Sample is identical.
Example 2:
In this example, EiAre as follows:
Similarly, EiAlso meet the condition of formula (2).OCC rotates pattern are as follows:
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 the above OCC rotation pattern is the form of a cyclic shift, it can also be it is easily verified that based on originally showing The problem of OCC rotation pattern of example also eliminates the power jitter between distinct symbols, and have not been changed port 7/ defined in R12 8 rotation pattern.
Since DMRS enhancing technology has in a PRB of each OFDM symbolThe case where a RE, the side of column permutation It can be only achieved power equalization in the PRB for the integral multiple that method can only be 4 in number.This also requires have one in selectivity of channel frequency Fixed limitation, it is, requiring channel frequency selection characteristic almost the same in 4 PRB.In order to solve this problem, we Propose another solution based on frequency dependence code, can mitigate it is above-mentioned based on the scheme of column permutation for channel frequency The requirement of selectivity.
Scheme based on frequency dependence code:
In the present solution, in step S401, the OCC on the corresponding subcarrier of described pair of available DMRS antenna port is carried out Pattern round-robin processing the step of include:
It will can use on the corresponding subcarrier of DMRS antenna port using the M DMRS OCC rotation pattern such as following formula:
{diag{f0}W, diag{f1}W, …, diag{fM-1}W}
Wherein, diag { fmIndicate with vector fmFor the diagonal matrix of diagonal element
Wherein, fm=[fm,0 fm,1 fm,2 fm,3], m=0 ... .M -1 meets FHF=I, wherein
For this programme is further described, we first provide current OCC rotation pattern [a b c d] and [d c b a] Expression way it is as follows.
Wherein, f0=[1 11 1], f1=[1-1-1 1].The above expression formula can indicate what current R12 version used Rotate pattern.For the transport layer on each antenna port, there is different frequency dependence codes.For example, [1 1] are for day Line end mouth 7/13, [1-1] correspond to antenna port 8/11.To which the transmission power of first OFDM symbol can be expressed as:
Wherein,Investigate the following conditions FHF=I (5)
It is obvious that if to F without special it is assumed thatDependent on vector a.If above-mentioned formula (5) can obtain To satisfaction, i.e., be all between the column of F matrix it is mutually orthogonal, then we are obtained using the constant modulus property of element in aThat is,OCC code a independent of time domain.This result forWithIt is also same.In other words, work as FHF=I, four DMRS intersymbols in a subframe have identical transmitting function Rate.
The OCC pattern of this programme is as shown in Figure 3, wherein in order to enable FHF=I is effective, and M should be greater than being equal to 4.
This programme is further illustrated with two examples below:
Example 3:
Preferably, the user equipment previous in order to compatibility, OCC pattern on the corresponding subcarrier in port 7/8 must be with The pattern of current R12 is consistent.Therefore preceding 2 column of matrix F are necessary are as follows:
For example, F matrix is set as M=6:
Wherein, t=e-jπ/3。
It, can be since the first two columns of F matrix is identical as the OCC pattern of existing R12 version using the above F matrix Compatible R12 and the user equipment of more older version in DMRS enhancing technology, while power is not between eliminating OFDM symbol locating for DMRS The problem of balance.
Example 4:
Work as M=9, F matrix is set as:
Wherein, s=e-j2π/9。
It is identical as the OCC pattern of existing R12 version to think that the above F matrix only has first row, therefore can only be in antenna port 7 On in DMRS enhancing technology compatible R12 and the user equipment of more older version.
Fig. 5 shows the method that signal is handled in the user equipment based on LTE according to a further aspect of the invention.Wherein, It is as shown in Figure 5:
In step S501, user equipment carries out demodulation process to the OFDM symbol from base station, is solved with obtaining through OFDM Data block after tune；
Then, in step S502, user equipment in the data block after OFDM demodulation with available DMRS antenna port At OCC progress and the above-mentioned pattern rotation referring to described in Fig. 3 in the base station based on LTE protocol on corresponding subcarrier Manage the processing of contrary.
That is, in order to solve unbalanced power between OFDM symbol present in the DMRS enhancing technology of existing LTE protocol Problem, base station according to the present invention is by carrying out pattern wheel to the OCC pattern on the corresponding subcarrier of available DMRS antenna port Turn processing, then carries out OFDM modulation through carrying out pattern rotation treated data block to OCC to comprising described again, generate OFDM Symbol, for being transmitted.Correspondingly, user equipment according to the present invention need to be to the number after OFDM demodulation from base station It carries out being based on LTE referring to described in Fig. 3 with above-mentioned according to the OCC on subcarrier corresponding with available DMRS antenna port in block The processing of pattern rotation processing contrary in the base station of agreement, could restore original son corresponding with available DMRS antenna port OCC on carrier wave.Because to those skilled in the art, it is easy to be derived therewith in a kind for the treatment of process known The processing of contrary, therefore this will not be repeated here.
Fig. 6, which shows a kind of of one aspect according to the present invention, to be believed in the base station based on LTE protocol for handling DMRS Number device, wherein as shown in Figure 4, comprising:
Pattern round-robin processing device 601, for carrying out pattern to the OCC on the corresponding subcarrier of available DMRS antenna port Round-robin processing, to reduce the unbalanced power between the OFDM symbol subsequently generated；
OFDM modulating device 602, for being carried out to comprising described through carrying out pattern rotation treated data block to OCC OFDM modulation, generates OFDM symbol.
That is, in order to solve unbalanced power between OFDM symbol present in the DMRS enhancing technology of existing LTE protocol Problem, base station according to the present invention is by carrying out pattern wheel to the OCC pattern on the corresponding subcarrier of available DMRS antenna port Turn processing, then carries out OFDM modulation through carrying out pattern rotation treated data block to OCC to comprising described again, generate OFDM Symbol.
Specifically, above-mentioned pattern rotation treatment process includes but is not limited to the OCC rotation figure used in pattern DMRS Sample carries out a degree of transformation, such as the transformation based on column permutation and frequency dependence code.It is provided individually below based on column permutation With two kinds of implementations of the transformation of frequency dependence code.
Scheme based on column permutation:
In the present solution, the pattern round-robin processing device 601 is specifically used for:
It is rotated on the corresponding subcarrier of available DMRS antenna port using the M=4 DMRS OCC that following formula provides Pattern::
{WE0,WE1,WE2,WE3} (1)
Wherein, EiIt is a 4x4 permutation matrix, i.e. EiEach column be all different, and selected from following collection:
And meet the following conditions:
Below for specifying 4 antenna ports 7/8/11/13 for DMRS enhancing in current LTE protocol, with two Example further illustrates scheme above based on column permutation:
Example 1:
Wherein, EiAre as follows:
Obviously, EiMeet the condition of above formula (2), then as shown in Fig. 2, the rotation of OCC rotates pattern are as follows:
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 it is easily verified that the DMRS symbol after column permutation in this example Between transmission power it is identical.
If PRB number is 4 integral multiple, based on this exemplary postrotational DMRS OCC pattern (hereinafter referred to as " OCC Pattern ") the problem of eliminating the power jitter between distinct symbols.Above-mentioned postrotational OCC pattern is updated to original walsh square In battle array, it can be seen that, rotation pattern identical with R12 version is still maintained on port 7/8 in this exampleOCC pattern transformation on port 11/13 are as follows:
As a preferred embodiment, since the OCC pattern on port 7/8 does not change, which can be in DMRS Compatible R12 and the user equipment of more older version in enhancing technology.
In general, other than example 1, if to support the user of R12 and more older version in DMRS enhancing technology Equipment, to EiAnother restrictive condition of selection is to guarantee that the OCC rotation pattern of port 7/8 is schemed with OCC specified in R12 agreement Sample is identical.
Example 2:
In this example, EiAre as follows:
Similarly, EiAlso meet the condition of formula (2).OCC rotates pattern are as follows:
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 the above OCC rotation pattern is the form of a cyclic shift, it can also be it is easily verified that based on originally showing The problem of OCC rotation pattern of example also eliminates the power jitter between distinct symbols, and have not been changed port 7/ defined in R12 8 rotation pattern.
Since DMRS enhancing technology has in a PRB of each OFDM symbolThe case where a RE, the side of column permutation It can be only achieved power equalization in the PRB for the integral multiple that method can only be 4 in number.This also requires have one in selectivity of channel frequency Fixed limitation, it is, requiring channel frequency selection characteristic almost the same in 4 PRB.In order to solve this problem, we Propose another solution based on frequency dependence code, can mitigate it is above-mentioned based on the scheme of column permutation for channel frequency The requirement of selectivity.
Scheme based on frequency dependence code:
In the present solution, the pattern round-robin processing 601 is specifically used for:
It will can use on the corresponding subcarrier of DMRS antenna port using the M DMRS OCC rotation pattern such as following formula:
{diag{f 0}W,diag{f1}W,…,diag{ fM-1W },
Wherein, diag { fmIndicate with vector fmFor the diagonal matrix of diagonal element
Wherein, fm=[fm,0 fm,1 fm,2 fm,3, m=0 ... .M-1 meets
FHF=I, wherein
For this programme is further described, we first provide current OCC rotation pattern [a b c d] and [d c b a] Expression way it is as follows:
Wherein, f0=[1 11 1], f1=[1-1-1 1].The above expression formula can indicate the rotation that current R12 is used Pattern.For the transport layer on each antenna port, there is different frequency dependence codes.For example, [1 1] are for antenna end Mouth 7/13, [1-1] correspond to antenna port 8/11.To which the transmission power of first OFDM symbol can be expressed as:
Wherein,Investigate the following conditions FHF=I (5)
It is obvious that if to F without special it is assumed thatDependent on vector a.If above-mentioned formula (5) is available Meet, i.e., be all between the column of F matrix it is mutually orthogonal, then we are obtained using the constant modulus property of element in aThat is,OCC code a independent of time domain.This result forWithIt is also same.In other words, work as FHF=I, four DMRS intersymbols in a subframe have identical transmitting function Rate.
The OCC pattern of this programme is as shown in Figure 3, wherein in order to enable FHF=I is effective, and M should be greater than being equal to 4.
This programme is further illustrated with two examples below:
Example 3:
Preferably, the user equipment previous in order to compatibility, OCC pattern on the corresponding subcarrier in port 7/8 must be with The pattern of current R12 is consistent.Therefore preceding 2 column of matrix F are necessary are as follows:
For example, F matrix is set as M=6:
Wherein, t=e-jπ/3。
It, can be since the first two columns of F matrix and the DMRS OCC pattern of existing R12 are identical using the above F matrix Compatible R12 and the user equipment of more older version in DMRS enhancing technology, while power is not between eliminating OFDM symbol locating for DMRS The problem of balance.
Example 4:
Work as M=9, F matrix is set as:
Wherein, s=e-j2π/9。
It is identical as the OCC pattern of existing R12 to think that the above F matrix only has first row, thus can only on antenna port 7 Compatible R12 and the user equipment of more older version in DMRS enhancing technology.
Fig. 7 shows the device that signal is handled in the user equipment based on LTE according to a further aspect of the invention, wherein As shown in Figure 5, comprising:
OFDM demodulation device, for carrying out demodulation process to the OFDM symbol from base station, to obtain after OFDM demodulation Data block；
Pattern rotation inversely processing device, for corresponding with available DMRS antenna port in the data block after OFDM demodulation Subcarrier on OCC carry out with above-mentioned referring to the described pattern rotation processing phase in the base station based on LTE protocol of Fig. 3 Inverse processing.
That is, in order to solve unbalanced power between OFDM symbol present in the DMRS enhancing technology of existing LTE protocol Problem, base station according to the present invention is by carrying out pattern wheel to the OCC pattern on the corresponding subcarrier of available DMRS antenna port Turn processing, then carries out OFDM modulation through carrying out pattern rotation treated data block to OCC to comprising described again, generate OFDM Symbol, for being transmitted.Correspondingly, user equipment according to the present invention need to be to the number after OFDM demodulation from base station It carries out being based on LTE referring to described in Fig. 3 with above-mentioned according to the OCC on subcarrier corresponding with available DMRS antenna port in block The processing of pattern rotation processing contrary in the base station of agreement, could restore original son corresponding with available DMRS antenna port OCC on carrier wave.Because to those skilled in the art, it is easy to be derived therewith in a kind for the treatment of process known The processing of contrary, therefore this will not be repeated here.
It should be noted that the present invention can be carried out in the assembly of software and/or software and hardware, for example, this hair Specific integrated circuit (ASIC) can be used in bright each device or any other is realized similar to hardware device.In one embodiment In, software program of the invention can be executed to implement the above steps or functions by processor.Similarly, of the invention Software program (including relevant data structure) can be stored in computer readable recording medium, for example, RAM memory, Magnetic or optical driver or floppy disc and similar devices.In addition, some of the steps or functions of the present invention may be implemented in hardware, example Such as, as the circuit cooperated with processor thereby executing each step or function.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims Variation is included in the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.This Outside, it is clear that one word of " comprising " does not exclude other units or steps, and odd number is not excluded for plural number.That states in system claims is multiple Unit or device can also be implemented through software or hardware by a unit or device.The first, the second equal words are used to table Show title, and does not indicate any particular order.
Although front is specifically shown and describes exemplary embodiment, it will be understood to those of skill in the art that It is that without departing substantially from the spirit and scope of claims, can be varied in terms of its form and details.Here Sought protection illustrates in the dependent claims.

Claims (16)

1. a kind of method in the base station based on LTE protocol for handling DMRS signal, wherein this method is carrying out OFDMA Before modulation further include:
Transformation based on column permutation or based on frequency dependence code, to the OCC on the corresponding subcarrier of available DMRS antenna port into Row pattern round-robin processing, to reduce the unbalanced power between the OFDM symbol subsequently generated；
Wherein, based on column permutation to include: the step of carrying out pattern round-robin processing
The M=4 DMRS OCC rotation figure provided on the available corresponding subcarrier of DMRS antenna port using following formula Sample:
{WE0,WE1,WE2,WE3}
Wherein, W is walsh matrix
EiIt is a 4x4 permutation matrix, i.e. EiEach column be all different, and selected from following collection:
And meet the following conditions:
Alternatively, the transformation based on frequency dependence code to include: the step of carrying out pattern round-robin processing
The M DMRS OCC rotation pattern such as following formula is used on the available corresponding subcarrier of DMRS antenna port:
{diag{f0}W,diag{f1}W,…,diag{fM-1}W}
Wherein, diag { fmIndicate with vector fmFor the diagonal matrix of diagonal element；
Wherein, W is walsh matrix:
fm=[fm,0 fm,1 fm,2 fm,3], m=0 ..., M-1 meets
FHF=I, wherein
2. the method for claim 1, wherein when based on column permutation to carry out pattern round-robin processing, EiAre as follows:
3. the method for claim 1, wherein when based on column permutation to carry out pattern round-robin processing, EiAre as follows:
4. the transformation the method for claim 1, wherein based on frequency dependence code is to carry out pattern round-robin processing, F is full The following condition of foot:
Preceding the 2 of F are classified as:
5. the transformation the method for claim 1, wherein based on frequency dependence code is to carry out pattern round-robin processing, M is 6, F meet following condition:
Wherein, t=e-jπ/3。
6. the transformation the method for claim 1, wherein based on frequency dependence code is to carry out pattern round-robin processing, M is 9, F meet following condition:
Wherein, s=e-j2π/9。
7. method according to any one of claim 1 to 6, wherein it is described can include with DMRS antenna port port 7, 8,11 and 13.
8. a kind of method for handling DMRS signal in the user equipment based on LTE, wherein include:
Transformation based on column permutation or based on frequency dependence code, in the data block after OFDM demodulation with available DMRS antenna end OCC on the corresponding subcarrier of mouth carries out the processing with the pattern rotation processing contrary in the claim 1-7.
9. a kind of device for being used to handle DMRS signal in the base station based on LTE protocol, wherein before carrying out OFDMA modulation, The device further include:
Pattern round-robin processing device, for the transformation based on column permutation or based on frequency dependence code, to available DMRS antenna port OCC on corresponding subcarrier carries out pattern round-robin processing, to reduce the unbalanced power between the OFDM symbol subsequently generated；
Wherein, when based on column permutation carrying out pattern round-robin processing, the pattern round-robin processing device is specifically used for:
Pattern is rotated using the M=4 DMRS OCC that following formula provides on the available corresponding subcarrier of DMRS antenna port:
{WE0,WE1,WE2,WE3}
Wherein, wherein W is walsh matrix:
EiIt is a 4x4 permutation matrix, i.e. EiEach column be all different, and selected from following collection:
And meet the following conditions:
Alternatively, the pattern round-robin processing device is specifically used when the transformation based on frequency dependence code is to carry out pattern round-robin processing In:
The M DMRS OCC rotation pattern such as following formula is used on the available corresponding subcarrier of DMRS antenna port:
{diag{f0}W,diag{f1}W,…,diag{fM-1}W}
Wherein, diag { fmIndicate with vector fmFor the diagonal matrix of diagonal element；
Wherein, W is walsh matrix:
fm=[fm,0 fm,1 fm,2 fm,3], m=0 ..., M-1 meets
FHF=I, wherein
10. device as claimed in claim 9, wherein when based on column permutation to carry out pattern round-robin processing, EiAre as follows:
11. device as claimed in claim 9, wherein when based on column permutation to carry out pattern round-robin processing, EiAre as follows:
12. device as claimed in claim 9, wherein when the transformation based on frequency dependence code is to carry out pattern round-robin processing, F Meet following condition:
Preceding the 2 of F are classified as:
13. device as claimed in claim 9, wherein when the transformation based on frequency dependence code is to carry out pattern round-robin processing, M Meet following condition for 6, F:
Wherein, t=e-jπ/3。
14. device as claimed in claim 9, wherein when the transformation based on frequency dependence code is to carry out pattern round-robin processing, M Meet following condition for 9, F:
Wherein, s=e-j2π/9。
15. the device according to any one of claim 9 to 14, wherein described can include port with DMRS antenna port 7,8,11 and 13.
16. a kind of device for handling DMRS signal in the user equipment based on LTE, wherein include:
Pattern rotation inversely processing device, for the transformation based on column permutation or based on frequency dependence code, to after OFDM demodulation OCC in data block on subcarrier corresponding with available DMRS antenna port is carried out and the pattern wheel in the claim 9-15 Change the processing of processing contrary.
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