CN109150386A - User terminal, serving cell demodulation method and storage medium, electronic equipment - Google Patents
User terminal, serving cell demodulation method and storage medium, electronic equipment Download PDFInfo
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- CN109150386A CN109150386A CN201710507184.4A CN201710507184A CN109150386A CN 109150386 A CN109150386 A CN 109150386A CN 201710507184 A CN201710507184 A CN 201710507184A CN 109150386 A CN109150386 A CN 109150386A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
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- 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
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0059—Out-of-cell user aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
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- Computer Networks & Wireless Communication (AREA)
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Abstract
A kind of user terminal, serving cell demodulation method and storage medium, electronic equipment, which comprises all resource elements corresponding to the current sign on current physical block traverse；Determine the corresponding interfered cell parameter of current sign on the current physical block；According to identified interfered cell parameter, the demodulation log-likelihood ratio of the corresponding serving cell of current sign on the current physical block is calculated.Above scheme can reduce occupied data space when serving cell demodulation.
Description
Technical field
The present invention relates to wireless communication fields more particularly to a kind of user terminal, serving cell demodulation method and storage to be situated between
Matter, electronic equipment.
Background technique
3GPP introduces the interference of network assistance formula and eliminates and inhibit (Network Assisted Interference
Cancellation and Suppression, NAICS) technology, base station passes through broadcast, dedicated signaling or downlink control
Information (Downlink Control Information, DCI) issues interfered cell parameter to user terminal.Interfered cell parameter
Order designator (Rank Indicator, RI) including adjacent area, pre-coding matrix instruction (Pre-coding Matrix
Indicator, PMI) and modulation type (Modulation, MOD).User terminal (User Equipment, UE) is known
In the case where the parameter of interfered cell, operation is performed corresponding processing for the signal received, the property of communication system can be made
It can be significantly improved.
However, the successful application of NAICS technology depends on RI, PMI and MOD that the base station of adjacent area is configured, will limit
The dispatching flexibility of the base station of adjacent area.In addition, the capacity of passback capacity and base station to UE between base station and base station are usually limited.
Therefore, in the prior art, UE carries out interfered cell parameter detecting according to the signal received, blind from the signal received to estimate
Count out interfered cell parameter.
In practical applications, to reduce computation complexity, usually interfered cell parameter detecting and serving cell demodulation are tied
It is combined carry out operation.Interfered cell parameter is first determined from the parameter combination of each group interfered cell, passes through plus and minus calculation later
The demodulation log-likelihood ratio of serving cell is calculated.
To reduce computation complexity, usually according to Physical Downlink Shared Channel (Physical Downlink Share
Channel, PDSCH) mapping order resource element (Resource Element, RE) is demodulated.In addition, dry to provide
The precision of cell parameter detection is disturbed, carries out the inspection of interfered cell parameter using effective RE in a Physical Resource Block as much as possible
It surveys.Due to needing to store calculating of each interfered cell parameter combination on each RE while carrying out interfered cell parameter detecting
Data, and the output of the demodulation log-likelihood ratio of serving cell sequence is frequency domain and in the dry of Physical Resource Block after first time domain
Disturb cell parameter determine after could export, therefore usually after the completion of the interfered cell parameter detecting on all Physical Resource Block
Export the demodulation log-likelihood ratio of serving cell.In the process, need to store each interfered cell parameter combination in all distribution
RE on calculating data, occupy biggish memory space.
Summary of the invention
What the embodiment of the present invention solved is occupied data space when how to reduce serving cell demodulation.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of serving cell demodulation method, comprising: to current object
The corresponding all resource elements of current sign on reason resource block are traversed；It determines current on the current physical block
The corresponding interfered cell parameter of symbol；According to identified interfered cell parameter, working as on the current physical block is calculated
The demodulation log-likelihood ratio of the corresponding serving cell of preceding symbol.
Optionally, the corresponding interfered cell parameter of current sign on the determining current physical block, comprising: calculate
The corresponding all resources of current sign under preset each group of interfered cell parameter combination, on the current physical block
Degree of reiability value corresponding to element；The corresponding interfered cell parameter combination of the smallest degree of reiability value is chosen, as institute
State the corresponding interfered cell parameter of current sign on current physical block.
Optionally, using following formula, the present physical under preset each group of interfered cell parameter combination is calculated
Degree of reiability value corresponding to the corresponding all resource elements of current sign on resource block:
Wherein, m indicates that current physical block, n indicate the current sign on current physical block, Metricm,n,iFor
The corresponding degree of reiability value of the corresponding i-th group of interfered cell parameter combination of current sign on current physical block；
Metricm,n-1,iFor the corresponding i-th group of interfered cell parameter combination of (n-1)th symbol on current physical block is corresponding can
By property metric；The corresponding all resource elements of the current sign that k ∈ (m, n) is expressed as on current physical block；rkTo work as
The signal vector that k-th of RE in current sign on preceding Physical Resource Block is received；ρSIt is sent out for the service signal of serving cell
The ratio of power and emission power of pilot signal is penetrated,To estimate the obtained channel matrix of serving cell,It is described
The pre-coding matrix of serving cell,For the data-signal of serving cell transmission；ρIFor the data-signal pair of the interfered cell
The ratio of the RE transmission power answered RE transmission power corresponding with DRS (Dedicated Reference Signal)；To estimate obtained interfered cell
Channel matrix；The pre-coding matrix that index for interfered cell is i,For the data-signal of interfered cell transmission.
Optionally, the interfered cell parameter includes: the transmission mode of interfered cell.
Optionally, the corresponding interfered cell parameter of current sign on the determining current physical block, comprising: work as n
When≤j, the transmission mode of the interfered cell is set as the first transmission mode, and determine working as on the current physical block
Other corresponding interfered cell parameters of preceding symbol；When the transmission mode of n=j and the interfered cell is the first transmission mode,
The transmission mode of the interfered cell as n > j is set as first transmission mode, and determines the current physical block
On other corresponding interfered cell parameters of current sign；When the transmission mode of n=j and the interfered cell is not the first transmission
When mode, the transmission mode of the interfered cell as n > j is set as the second transmission mode, and determines the present physical money
Other corresponding interfered cell parameters of current sign in source block；First transmission mode and second transmission mode are not
Together, n is the corresponding mark of current sign, and j is default value, and 1≤j≤N, N are total symbol numbers of downlink subframe.
Optionally, first transmission mode is Rank1 transmission mode, and second transmission mode is that SFBC transmits mould
Formula.
Optionally, when first transmission mode is Rank1 transmission mode, working as on current physical block is being calculated
After the demodulation log-likelihood ratio of the corresponding serving cell of preceding symbol, further includes: to current on the current physical block
The demodulation log-likelihood ratio of the corresponding serving cell of symbol is calibrated.
Optionally, the demodulation logarithm to the corresponding serving cell of current sign on the current physical block is seemingly
Right ratio is calibrated, comprising: calculates the corresponding degree of reiability value of current sign on the current physical block；Obtain with
The corresponding degree of reiability of current sign on the current physical block is worth corresponding first weighting coefficient；By described first
Weighting coefficient demodulation log-likelihood ratio corresponding with the current sign on the current physical block is multiplied, and obtains first and multiplies
Product；Second weighting coefficient is multiplied with the output log-likelihood ratio of default receiver, obtains the second product；By first product
With second product addition, obtain with value as the corresponding service of current sign on the current physical block after calibration
The demodulation log-likelihood ratio of cell；Wherein, the sum of the first weighting coefficient and the second weighting coefficient are 1.
Optionally, the interfered cell parameter includes: the modulation type of interfered cell.
Optionally, the demodulation log-likelihood for calculating the corresponding serving cell of current sign on current physical block
Than, comprising: according to the corresponding modulation type of previous symbol of current sign on the current physical block, work as described in calculating
The demodulation log-likelihood ratio of the corresponding serving cell of current sign on preceding Physical Resource Block.
The embodiment of the invention also provides a kind of user terminals, comprising: Traversal Unit, for current physical block
The corresponding all resource elements of current sign traversed；Interfered cell parameter determination unit, for determining the current object
Manage the corresponding interfered cell parameter of the current sign on resource block；Computing unit, for according to identified interfered cell
Parameter calculates the demodulation log-likelihood ratio of the corresponding serving cell of current sign on the current physical block.
Optionally, the interfered cell parameter determination unit, for calculating in preset each group of interfered cell parameter group
Under conjunction, degree of reiability value corresponding to the corresponding all resource elements of current sign on the current physical block；Choosing
The corresponding interfered cell parameter combination of the smallest degree of reiability value is taken, as the current sign on the current physical block
Corresponding interfered cell parameter.
Optionally, the interfered cell parameter determination unit, it is dry at preset each group for being calculated using following formula
It disturbs under cell parameter combination, it is reliable corresponding to the corresponding all resource elements of current sign on the current physical block
Property metric:
Wherein, m indicates that current physical block, n indicate the current sign on Physical Resource Block, Metricm,n,iIt is current
The corresponding degree of reiability value of the corresponding i-th group of interfered cell parameter combination of current sign on Physical Resource Block；
Metricm,n-1,iFor the corresponding i-th group of interfered cell parameter combination of (n-1)th symbol on current physical block is corresponding can
By property metric, (n-1)th symbol is the previous symbol of current sign；K ∈ (m, n) is expressed as on current physical block
The corresponding all resource elements of current sign；rkIt is received for k-th of RE in the current sign on current physical block
Signal vector；ρSFor the service signal transmission power of serving cell and the ratio of emission power of pilot signal,To estimate
The channel matrix of the serving cell arrived,For the pre-coding matrix of the serving cell,For the data of serving cell transmission
Signal；ρIFor the corresponding RE transmission power of the data-signal RE transmission power corresponding with DRS (Dedicated Reference Signal) of the interfered cell
Ratio；For the channel matrix for estimating obtained interfered cell；The precoding square that index for interfered cell is i
Battle array,For the data-signal of interfered cell transmission.
Optionally, the interfered cell parameter includes: the transmission mode of interfered cell.
Optionally, the interfered cell parameter determination unit, for setting the transmission mould of the interfered cell as n≤j
Formula is the first transmission mode, and determines other corresponding cell parameters of current sign on the current physical block；Work as n=
When the transmission mode of j and the interfered cell is the first transmission mode, the transmission mode of the interfered cell as n > j is set
For first transmission mode, and determine corresponding other interfered cells ginseng of the current sign on the current physical block
Number；When the transmission mode of n=j and the interfered cell is not the first transmission mode, setting interfered cell as n > j
Transmission mode be the second transmission mode, and determine that other corresponding interference of current sign on the current physical block are small
Area's parameter；First transmission mode is different from second transmission mode, and n is the corresponding mark of current sign, and j is present count
Value, and 1≤j≤N, N are total symbol numbers of downlink subframe.
Optionally, first transmission mode is Rank1 transmission mode, and second transmission mode is that SFBC transmits mould
Formula.
Optionally, the user terminal further include: calibration unit, for being Rank1 transmission when first transmission mode
It is right after the demodulation log-likelihood ratio for calculating the corresponding serving cell of current sign on current physical block when mode
The demodulation log-likelihood ratio of the corresponding serving cell of current sign on the current physical block is calibrated.
Optionally, the calibration unit, it is corresponding reliable for calculating the current sign on the current physical block
Property metric；Degree of reiability value corresponding first corresponding with the current sign on the current physical block is obtained to weight
Coefficient；By first weighting coefficient demodulation log-likelihood ratio phase corresponding with the current sign on the current physical block
Multiply, obtains the first product；Second weighting coefficient is multiplied with the output log-likelihood ratio of default receiver, obtains the second product；
By first product and second product addition, obtain and value is as current on the current physical block after calibration
The demodulation log-likelihood ratio of the corresponding serving cell of symbol；Wherein, the sum of the first weighting coefficient and the second weighting coefficient are 1.
Optionally, the interfered cell parameter includes: the modulation type of interfered cell.
Optionally, the computing unit, for the previous symbol according to current sign on the current physical block
Corresponding modulation type calculates the demodulation log-likelihood of the corresponding serving cell of current sign on the current physical block
Than.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described
Serving cell demodulation method described in executing any of the above-described kind when computer instruction operation.
The embodiment of the invention also provides a kind of electronic equipment, including memory and processor, stored on the memory
There is the computer instruction that can be run on the processor, the processor executes any of the above-described when running the computer instruction
Serving cell demodulation method described in kind.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
All resource elements corresponding to the current sign on current physical block traverse, to determine present physical
The corresponding interfered cell parameter of current sign on resource block.In the corresponding interference of current sign for determining current physical block
After cell parameter, the demodulation log-likelihood ratio of the corresponding serving cell of current sign directly on calculating current physical block,
Without storing calculating data of multiple interfered cell parameter combinations on the resource element of all distribution, therefore greatly reduce
Serving cell occupied data space when demodulating.
Further, it sets on current physical block, the transmission of the interfered cell in the interfered cell parameter of preceding j symbol
Mode is the first transmission mode, and the transmission mode of the interfered cell in the interfered cell parameter of other symbols is the second transmission mould
Formula, and the first transmission mode is different from the second transmission mode, therefore only need to carry out interfered cell parameter in a kind of transmission mode
Detection, and all transmission modes need not be traversed on preceding j symbol, therefore interfered cell parameter detecting can be further decreased
Computation complexity.
Further, the transmission mode of the interfered cell before setting in the interfered cell parameter of j symbol is the first transmission
When mode, the corresponding serving cell of current sign being calculated on current physical block demodulation log-likelihood ratio it
Afterwards, the demodulation log-likelihood ratio of obtained serving cell is calibrated, to reduce the demodulation performance loss of serving cell.
In addition, for the current sign on current physical block, the corresponding modulation type of setting current sign with it is previous
The corresponding modulation type of symbol is identical, therefore only needs to store a kind of corresponding calculating data of modulation type, more without storing
The corresponding calculating data of kind modulation type, therefore it is empty further to reduce occupied data storage when serving cell demodulation
Between.
Detailed description of the invention
Fig. 1 is the flow chart of one of embodiment of the present invention serving cell demodulation method；
Fig. 2 is the structural schematic diagram of one of embodiment of the present invention user terminal.
Specific embodiment
In practical applications, the letter that user terminal receives on k-th of resource element (Resource Element, RE)
Number vector is rk, rkIt can be expressed as following formula (1):
In formula (1),It is expressed as the corresponding efficient channel matrix of the corresponding serving cell of k-th of RE, efficient channel matrix
Including actual channel matrix and pre-coding matrix；For the signal of the corresponding serving cell of k-th of RE；It is expressed as kth
The corresponding efficient channel matrix in the corresponding interfered cell a RE；For the signal of the corresponding interfered cell k-th of RE；nkFor kth
The corresponding noise signal of a RE, and nkIt is for varianceIndependent identically distributed complex-valued Gaussian element additive noise vector；1≤
K≤K, K are the number of RE needed for executing the estimation of interfered cell blind Detecting.
In LTE system, mobile terminal generallys use pilot signal to estimate the channel of serving cell, and pilot signal can be with
For cell special reference (Cell-specific Reference Signals, CRS).Estimate obtained serving cell
Channel matrix isEstimate that the obtained channel matrix of interfered cell isThen above formula (1) can be expressed as following formula
(2):
Wherein, ρSFor the service signal transmission power of serving cell and the ratio of emission power of pilot signal, ρIIt is small to interfere
The service signal transmission power in area and the ratio of emission power of pilot signal.ρSIt can be referred to as the service pilot ratio of serving cell again
(Traffic to Pilot Rate, TPR), ρIFor the TPR that can be referred to as interfered cell again.For the corresponding service of k-th of RE
The pre-coding matrix of cell,For the pre-coding matrix of the corresponding interfered cell k-th of RE.
According to interior about orthogonal frequency division multiplexing in Transmission Time Interval (Transmission Time Interval, TTI)
The position RE of (Orthogonal Frequency Division Multiplexing, OFDM) index, by 3GPP LTE
The function for the two TPR parameters formulated in system provides the TPR of the serving cell and TPR of interfered cell.
In order to overcome cell scheduling to limit and network signaling overhead, UE blind estimate can go out interfere from the signal received
Cell parameter, interfered cell parameter include the TPR etc. of adjacent area RI, PMI, MOD and interfered cell.
User terminal carries out joint blind Detecting to interfered cell, to obtain PMI, MOD and TPR of interfered cell.It is existing
In technology, following formula (3) is generallyd use to obtain the interfered cell parameter of interfered cell on k-th of RE:
In formula (3),For the modulation type of the corresponding serving cell of k-th of RE,It is small for the corresponding interference of k-th of RE
The modulation type in area.In formula (3), ρS、AndUser terminal can be issued to by network signal by serving cell,
Namely ρS、AndIt is known.Therefore, the physical significance of formula (3) can indicate are as follows: selection enables to formulaThe smallest ρ of valueI、AndAs being interfered on k-th of RE
The interfered cell parameter of cell.
In practical applications, at calculating formula (3), usually traversal ρI、AndAll possible values, to obtain
EDk。
After determining that interfered cell sends the corresponding interfered cell parameter of signal, it is based on maximum likelihood (Maximum
Likelihood, ML) algorithm demodulation soft bit output can indicate are as follows:
Wherein,For nkPower, LLRk,mFor the corresponding soft bit values of m bit received on k-th of RE, CS, m=x
When for m bit value being xAll possible value set, and the value of x is 0 or 1.
From above formula (3) and formula (4) it is found that being required to count when carrying out interfered cell parameter detecting and serving cell demodulates
Calculate following formula:
In order to reduce computation complexity, interfered cell parameter detecting is combined with serving cell demodulation usually, that is, is being carried out
Each interfered cell parameter combination corresponding ED value on each RE is stored when the parameter detecting of interfered cell.In interfered cell, parameter is true
After fixed, the soft bit values of serving cell namely the demodulation log-likelihood of serving cell can be obtained by simple plus and minus calculation
Than.
In the prior art, usually RE is demodulated according to the mapping order of PDSCH, namely is demodulated to RE
When, using the sequence of time domain after first frequency domain.Meanwhile to improve the precision of interfered cell parameter detecting, need to utilize as far as possible
Effective RE in one RB carries out interfered cell detection.It is small due to needing to store each interference when carrying out interfered cell parameter detecting
Area's parameter combination corresponding ED value on each RE, and the LLR output sequence demodulated is that first frequency domain time domain and needs to wait until again
The interfered cell parameter of corresponding RB could export after determining, it is therefore desirable to until the corresponding interfered cell ginseng of the RB of all distribution
LLR is just exported after the completion of number detection, needs to store ED value of each interfered cell parameter combination on the RE of all distribution, occupies
Biggish memory space.
In embodiments of the present invention, all resource elements first corresponding to the current sign on current RB traverse, with
Determine the corresponding interfered cell parameter of current sign on current RB.In the corresponding interfered cell of current sign of the current RB of determination
After parameter, the demodulation log-likelihood ratio of the corresponding serving cell of current sign on current RB is directly calculated, without storage
ED value of multiple interfered cell parameter combinations on the RE of all distribution, therefore greatly reduce memory space.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
The embodiment of the invention provides a kind of serving cell demodulation methods, referring to Fig.1, carry out below in conjunction with specific steps detailed
It describes in detail bright.
Step S101, all resource elements corresponding to the current sign on current physical block traverse.
It in specific implementation, can be first to current when carrying out interfered cell parameter detecting and serving cell demodulation operation
The corresponding all resource elements of current sign on RB are traversed.That is, being single with symbol in embodiments of the present invention
Position traverses all RE in a symbol on a Physical Resource Block.
After all resource elements corresponding to the current sign on current physical block complete traversal, step is executed
S102。
Step S102 determines the corresponding interfered cell parameter of current sign on the current physical block.
In practical applications it is found that may have multiple groups interfered cell parameter combination.Therefore, it can be interfered from multiple groups small
In area's parameter combination, the corresponding interfered cell parameter of current sign on current physical block is chosen.
In specific implementation, it can calculate under preset each group of interfered cell parameter combination, current physical block
On the corresponding all RE of current sign corresponding to degree of reiability value.Obtaining, all interfered cell parameter combinations are corresponding
After degree of reiability value, the smallest degree of reiability value is therefrom chosen, and the smallest degree of reiability is worth corresponding interference
Cell parameter is combined as the corresponding interfered cell parameter of current sign on current physical block.
In embodiments of the present invention, current physical block is set as m-th of Physical Resource Block, m-th of current sign
Nth symbol on Physical Resource Block, can calculate that each group of interfered cell parameter combination is corresponding using following formula can
By property metric:
Wherein, Metricm,n,iFor the corresponding i-th group of interfered cell parameter combination of current sign on current physical block
Corresponding degree of reiability value；Metricm,n-1,iFor the corresponding i-th group of interference of (n-1)th symbol on current physical block
Cell parameter combines corresponding degree of reiability value, and (n-1)th symbol is the previous symbol of current sign；K ∈ (m, n) is indicated
For the corresponding all RE of the current sign on current physical block.
The corresponding interference of current sign in the case where obtaining each group of interfered cell parameter combination on current physical block is small
It, can be from degree of reiability value corresponding to all interfered cell parameter combinations after degree of reiability value corresponding to area's parameter
In, choose the smallest degree of reiability value.
In specific implementation, the smallest degree of reiability value can be chosen using following formula (7):
Wherein,To take Metricm,n,iIn minimum value, selected taking-up it is the smallest reliable
Property metric be q group interfered cell parameter combination, in other words, the corresponding interference of current sign on current physical block
Cell parameter is the corresponding parameter of q group interfered cell parameter combination.
Step S103 calculates the current sign on the current physical block according to identified interfered cell parameter
The demodulation log-likelihood ratio of corresponding serving cell.
In specific implementation, after determining interfered cell parameter, that is, above formula (4) can be used to calculate current physical
The demodulation log-likelihood ratio of the corresponding serving cell of current sign on block.
It can be seen that in embodiments of the present invention, when carrying out interfered cell detection, it is only necessary to store each group interfered cell ginseng
Array closes the corresponding ED value of all RE in a symbol on a Physical Resource Block, and it is corresponding can to calculate serving cell
Demodulation log-likelihood ratio simultaneously exports, so that the memory space of very little is only needed, without storing all interfered cell parameters in institute
There is the ED value of Physical Resource Block, therefore greatly reduces required memory space.
In LTE system, defining transmission mode (Transport Mode, TM) relevant to CRS includes: 1) TM1: single
One antenna port；2) TM2/3, transmission diversity is used for order 1, and postpones cyclic diversity (Large Cyclic Delay greatly
Diversity, LCDD) it is used for order 2；3) TM4/6: 2 precoding of order 1 or order based on the port 2/4CRS.
All TM based on CRS specified for LTE system can be divided into 3 kinds of transformats: 1) Rank1 transmits mould
Formula, can regard as pre-coding matrix be 1 special shape or TM4/6 in 1 precoding of order；2) Rank2 transmission mode is
2 precoding of TM2/3LCDD, TM4/6 order；3) SFBC transmission mode is TM2/3 transmission diversity.
As shown in the above, if traversal ρI、AndAll possible values, computation complexity is too high.
In embodiments of the present invention, to reduce computation complexity, the current sign pair on current physical block is being determined
When the interfered cell parameter answered, current sign on current physical block can be first set as on m-th of Physical Resource Block
Nth symbol sets N as total symbol numbers of downlink subframe, and 1≤j≤N, sets default value j.If n≤j, can set
The transmission mode for determining interfered cell in the parameter of interfered cell is the first transmission mode, and interfered cell is determined under the first transmission mode
Corresponding pre-coding matrix and ρIWithAs n=j, if the transmission mode of interfered cell is the first transmission mode, set
As n > j, the transmission mode of interfered cell is still the first transmission mode, and continues to determine interfered cell under the first transmission mode
Corresponding pre-coding matrix and ρIWithAs n=j, if the transmission mode of interfered cell is not the first transmission mode, set
The transmission mode of interfered cell is the second transmission mode when settled n > j, and determines that interfered cell is corresponding under the second transmission mode
Pre-coding matrix and ρIWith
That is, in embodiments of the present invention, without traversing all transmission modes, on current physical block
Preceding j symbol, the interfered cell transmission mode before directly setting in j symbol corresponding interfered cell parameter transmits as first
Mode, at this time, it is only necessary to determine the corresponding pre-coding matrix of the first transmission modeAnd traverse all ρIAnd?.
When the transmission mode for detecting the corresponding interfered cell of j-th of symbol is the first transmission mode, interfered cell when setting n > j
Transmission mode be still the first transmission mode, and determine the corresponding pre-coding matrix of the first transmission modeAnd it traverses all
ρIAnd, without traversing all transmission modes.When the transmission mode for detecting the corresponding interfered cell of j-th of symbol
When not being the first transmission mode, the transmission mode of interfered cell is the second transmission mode when setting n > j, and determines the second transmission
The corresponding pre-coding matrix of modeAnd traverse all ρIAnd, without traversing all transmission modes.Thus
As it can be seen that determining the corresponding pre-coding matrix in interfered cell after the transmission mode for passing through setting interfered cellAnd ρIWith
Without traversing all transmission modes, therefore the computation complexity of interfered cell parameter detecting can be reduced.
In practical applications, interfered cell sends the modulation type of symbolIncluding QPSK, 16QAM, 64QAM and
Four kinds of possibility such as 256QAM.In the prior art, each symbol on each Physical Resource Block needs to store above-mentioned four kinds of possibility
Modulation type and ED value of other interfered cell parameter combinations on each RE, can equally occupy biggish memory space.
In the prior art it is found that interfered cell parameter includes modulation type, ρIWithTherefore, each Physical Resource Block
On each symbol need to store different ρ when modulation type is QPSKIWithED value on each RE, modulation type are
Different ρ when 16QAMIWithThe different ρ when the ED value on each RE, modulation type are 64QAMIWithOn each RE
ED value and modulation type different ρ when being 256QAMIWithED value on each RE.
In embodiments of the present invention, to further decrease the demand to memory space, on each Physical Resource Block
Each symbol only stores a kind of corresponding ED value of modulation type.It is corresponding for the current sign on current physical block
Modulation type is the corresponding modulation type of previous symbol of current sign.
For example, the corresponding modulation type of previous symbol of the current sign on current physical block is 16QAM, then currently
The corresponding modulation type of current sign on Physical Resource Block is set as 16QAM.It is current on current physical block calculating
It is that 16QAM is calculated with modulation type, to only need to store when the demodulation log-likelihood ratio of the corresponding serving cell of symbol
Modulation type is the corresponding ED value of 16QAM.
It can be seen that in embodiments of the present invention, a kind of corresponding ED value of modulation type is only stored, rather than stores four kinds
The corresponding ED value of modulation type, therefore the demand to memory space can be further decreased.
In specific implementation, since in the above embodiment of the present invention, each symbol on each Physical Resource Block is only
An interfered cell parameter detecting has been carried out, and has been based only upon the biography of interfered cell on several symbols before each Physical Resource Block
Defeated mode is that Rank1 transmission mode is detected, if the actual transmissions mode of interfered cell is Rank2 transmission mode or SFBC
Transmission mode, then will lead to system performance, there are biggish losses.
In embodiments of the present invention, to reduce the influence to the demodulation performance of serving cell, the first transmission mode is being set
For Rank1 transmission mode, and the demodulation logarithm for the corresponding serving cell of current sign being calculated on current physical block
It, can also be to the demodulation logarithm of the corresponding serving cell of current sign on obtained current physical block after likelihood ratio
Likelihood ratio is calibrated.
In specific implementation, the corresponding degree of reiability value of current sign on current physical block can first be calculated.
According to the corresponding degree of reiability value of current sign on current physical block, corresponding first weighting coefficient is obtained.
The first obtained weighting coefficient degree of reiability value corresponding with the current sign on current physical block is multiplied, will be obtained
Product as the first product.Second weighting coefficient is multiplied with the output log-likelihood ratio of preset receiver, obtains second
Product, by the first product and the second product addition, obtain and value is the current symbol on the current physical block after calibrating
The demodulation log-likelihood ratio of number corresponding serving cell.The sum of first weighting coefficient and the second weighting coefficient are 1.
In embodiments of the present invention, using following formula to the corresponding serving cell of current sign on current physical block
Demodulation log-likelihood ratio is calibrated:
LLR_Outm,n,j=αm,n*LLR_ICm,n,j+(1-αm,n)*LLR_EIRCm,n,j； (8)
Wherein, LLR_Outm,n,jFor the solution of the corresponding serving cell of current sign on the current physical block after calibration
Adjust log-likelihood ratio, LLR_ICm,n,jFor the solution of the corresponding serving cell of current sign on the current physical block before calibration
Adjust log-likelihood ratio, LLR_EIRCm,n,jFor the output log-likelihood ratio of preset receiver, αm,nFor the first weighting coefficient, (1-
αm,n) it is the second weighting coefficient.
It can be seen that the transmission mode of the interfered cell before setting in the interfered cell parameter of j symbol is passed as first
When defeated mode, the corresponding serving cell of current sign being calculated on current physical block demodulation log-likelihood ratio it
Afterwards, the demodulation log-likelihood ratio of obtained serving cell is calibrated, to reduce the demodulation performance loss of serving cell.
Referring to Fig. 2, one of embodiment of the present invention user terminal is given, comprising: Traversal Unit 201, interfered cell
Parameter determination unit 202 and computing unit 203, in which:
Traversal Unit 201, for the corresponding all resource elements progress time of the current sign on current physical block
It goes through；
Interfered cell parameter determination unit 202, for determining the current sign pair on the current physical block
The interfered cell parameter answered；
Computing unit 203, for calculating working as on the current physical block according to identified interfered cell parameter
The demodulation log-likelihood ratio of the corresponding serving cell of preceding symbol.
In specific implementation, the interfered cell parameter determination unit 202 can be used for calculating dry at preset each group
It disturbs under cell parameter combination, it is reliable corresponding to the corresponding all resource elements of current sign on the current physical block
Property metric；The corresponding interfered cell parameter combination of the smallest degree of reiability value is chosen, as the current physical block
On the corresponding interfered cell parameter of current sign.
In specific implementation, the interfered cell parameter determination unit 202 can be used for calculating using following formula pre-
If each group of interfered cell parameter combination under, the corresponding all resource elements of current sign on the current physical block
Corresponding degree of reiability value:
Wherein, m indicates that current physical block, n indicate the current sign on current physical block, Metricm,n,iFor
The corresponding degree of reiability value of the corresponding i-th group of interfered cell parameter combination of current sign on current physical block；
Metricm,n-1,iFor the corresponding i-th group of interfered cell parameter combination of (n-1)th symbol on current physical block is corresponding can
By property metric；The corresponding all resource elements of the current sign that k ∈ (m, n) is expressed as on current physical block；rkTo work as
The signal vector that k-th of RE in current sign on preceding Physical Resource Block is received；ρSIt is sent out for the service signal of serving cell
The ratio of power and emission power of pilot signal is penetrated,To estimate the obtained channel matrix of serving cell,It is described
The pre-coding matrix of serving cell,For the data-signal of serving cell transmission；ρIFor the data-signal pair of the interfered cell
The ratio of the RE transmission power answered RE transmission power corresponding with DRS (Dedicated Reference Signal)；To estimate obtained interfered cell
Channel matrix；The pre-coding matrix that index for interfered cell is i,For the data-signal of interfered cell transmission.
In specific implementation, the interfered cell parameter may include: the transmission mode of interfered cell.
In specific implementation, the interfered cell parameter determination unit 202, can be used for as n≤j, set described dry
The transmission mode for disturbing cell is the first transmission mode, and determine the current sign on the current physical block it is corresponding other
Cell parameter；When the transmission mode of n=j and the interfered cell is the first transmission mode, the interference as n > j is set
The transmission mode of cell is first transmission mode, and determine the current sign on the current physical block it is corresponding its
His interfered cell parameter；When the transmission mode of n=j and the interfered cell is not the first transmission mode, set as n > j
The transmission mode of the interfered cell is the second transmission mode, and determines that the current sign on the current physical block is corresponding
Other interfered cell parameters；First transmission mode is different from second transmission mode, and n is the corresponding mark of current sign
Know, j is default value, and 1≤j≤N, N are total symbol numbers of downlink subframe.
In specific implementation, first transmission mode can be Rank1 transmission mode, and second transmission mode can be with
For SFBC transmission mode.
In specific implementation, the user terminal 20 can also include: calibration unit 204, for when first transmission
When mode is Rank1 transmission mode, in the demodulation pair for calculating the corresponding serving cell of current sign on current physical block
After number likelihood ratios, to the demodulation log-likelihood ratio of the corresponding serving cell of current sign on the current physical block into
Row calibration.
In specific implementation, the calibration unit 204 can be used for calculating the current symbol on the current physical block
Number corresponding degree of reiability value；Obtain degree of reiability value pair corresponding with the current sign on the current physical block
The first weighting coefficient answered；By first weighting coefficient demodulation corresponding with the current sign on the current physical block
Log-likelihood ratio is multiplied, and obtains the first product；Second weighting coefficient is multiplied with the output log-likelihood ratio of default receiver, is obtained
To the second product；By first product and second product addition, obtain and value is as the present physical money after calibration
The demodulation log-likelihood ratio of the corresponding serving cell of current sign in source block；Wherein, the first weighting coefficient and the second weighting system
The sum of number is 1.
In specific implementation, the interfered cell parameter may include: the modulation type of interfered cell.
In specific implementation, the computing unit 203 can be used for according to current sign on the current physical block
The corresponding modulation type of previous symbol, calculate the corresponding serving cell of current sign on the current physical block
Demodulate log-likelihood ratio.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described
The serving cell demodulation method provided in any of the above-described embodiment of the present invention is provided when computer instruction is run.
The embodiment of the invention also provides a kind of electronic equipment, including memory and processor, stored on the memory
There is the computer instruction that can be run on a processor, the processor executes above-mentioned of the present invention when running the computer instruction
The serving cell demodulation method provided in one embodiment.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (22)
1. a kind of serving cell demodulation method characterized by comprising
All resource elements corresponding to the current sign on current physical block traverse；
Determine the corresponding interfered cell parameter of current sign on the current physical block；
According to identified interfered cell parameter, the corresponding serving cell of current sign on the current physical block is calculated
Demodulation log-likelihood ratio.
2. serving cell demodulation method as described in claim 1, which is characterized in that on the determining current physical block
The corresponding interfered cell parameter of current sign, comprising:
It calculates under preset each group of interfered cell parameter combination, the current sign on the current physical block is corresponding
Degree of reiability value corresponding to all resource elements；
The corresponding interfered cell parameter combination of the smallest degree of reiability value is chosen, as working as on the current physical block
The corresponding interfered cell parameter of preceding symbol.
3. serving cell demodulation method as claimed in claim 2, which is characterized in that use following formula, calculate preset
Under each group of interfered cell parameter combination, the corresponding all resource element institutes of current sign on the current physical block are right
The degree of reiability value answered:
Wherein, m indicates that current physical block, n indicate the current sign on current physical block, Metricm,n,iIt is current
The corresponding degree of reiability value of the corresponding i-th group of interfered cell parameter combination of current sign on Physical Resource Block；
Metricm,n-1,iFor the corresponding i-th group of interfered cell parameter combination of (n-1)th symbol on current physical block is corresponding can
By property metric；The corresponding all resource elements of the current sign that k ∈ (m, n) is expressed as on current physical block；rkTo work as
The signal vector that k-th of RE in current sign on preceding Physical Resource Block is received；ρSIt is sent out for the service signal of serving cell
The ratio of power and emission power of pilot signal is penetrated,To estimate the obtained channel matrix of serving cell,It is described
The pre-coding matrix of serving cell,For the data-signal of serving cell transmission；ρIFor the data-signal pair of the interfered cell
The ratio of the RE transmission power answered RE transmission power corresponding with DRS (Dedicated Reference Signal)；To estimate obtained interfered cell
Channel matrix；The pre-coding matrix that index for interfered cell is i,For the data-signal of interfered cell transmission.
4. serving cell demodulation method as described in claim 1, which is characterized in that the interfered cell parameter includes: interference
The transmission mode of cell.
5. serving cell demodulation method as claimed in claim 4, which is characterized in that on the determining current physical block
The corresponding interfered cell parameter of current sign, comprising:
As n≤j, the transmission mode of the interfered cell is set as the first transmission mode, and determines the current physical
Other corresponding interfered cell parameters of current sign on block；
When the transmission mode of n=j and the interfered cell is the first transmission mode, setting interfered cell as n > j
Transmission mode is first transmission mode, and determines other corresponding interference of the current sign on the current physical block
Cell parameter；When the transmission mode of n=j and the interfered cell is not the first transmission mode, setting is described dry as n > j
The transmission mode for disturbing cell is the second transmission mode, and determine the current sign on the current physical block it is corresponding other
Interfered cell parameter；
First transmission mode is different from second transmission mode, and n is the corresponding mark of current sign, and j is default value,
And 1≤j≤N, N are total symbol numbers of downlink subframe.
6. serving cell demodulation method as claimed in claim 5, which is characterized in that first transmission mode is Rank1 biography
Defeated mode, second transmission mode are SFBC transmission mode.
7. serving cell demodulation method as claimed in claim 6, which is characterized in that when first transmission mode is Rank1
When transmission mode, calculate current physical block on the corresponding serving cell of current sign demodulation log-likelihood ratio it
Afterwards, further includes:
The demodulation log-likelihood ratio of the corresponding serving cell of current sign on the current physical block is calibrated.
8. serving cell demodulation method as claimed in claim 7, which is characterized in that described on the current physical block
The demodulation log-likelihood ratio of the corresponding serving cell of current sign calibrated, comprising:
Calculate the corresponding degree of reiability value of current sign on the current physical block；
It obtains degree of reiability corresponding with the current sign on the current physical block and is worth corresponding first weighting coefficient；
By first weighting coefficient demodulation log-likelihood ratio phase corresponding with the current sign on the current physical block
Multiply, obtains the first product；
Second weighting coefficient is multiplied with the output log-likelihood ratio of default receiver, obtains the second product；
By first product and second product addition, obtain and value is as on the current physical block after calibration
The demodulation log-likelihood ratio of the corresponding serving cell of current sign；
Wherein, the sum of the first weighting coefficient and the second weighting coefficient are 1.
9. serving cell demodulation method as described in claim 1, which is characterized in that the interfered cell parameter includes: interference
The modulation type of cell.
10. serving cell demodulation method as claimed in claim 9, which is characterized in that on the calculating current physical block
The corresponding serving cell of current sign demodulation log-likelihood ratio, comprising:
According to the corresponding modulation type of previous symbol of current sign on the current physical block, the current object is calculated
Manage the demodulation log-likelihood ratio of the corresponding serving cell of current sign on resource block.
11. a kind of user terminal characterized by comprising
Traversal Unit, for being traversed to the corresponding all resource elements of the current sign on current physical block；
Interfered cell parameter determination unit, for determining the corresponding interference of the current sign on the current physical block
Cell parameter；
Computing unit, for calculating the current sign on the current physical block according to identified interfered cell parameter
The demodulation log-likelihood ratio of corresponding serving cell.
12. user terminal as claimed in claim 11, which is characterized in that the interfered cell parameter determination unit, based on
Calculate the corresponding all moneys of current sign under preset each group of interfered cell parameter combination, on the current physical block
Degree of reiability value corresponding to source element；The corresponding interfered cell parameter combination of the smallest degree of reiability value is chosen, as
The corresponding interfered cell parameter of current sign on the current physical block.
13. user terminal as claimed in claim 12, which is characterized in that the interfered cell parameter determination unit, for adopting
The current sign under preset each group of interfered cell parameter combination, on the current physical block is calculated with following formula
Degree of reiability value corresponding to corresponding all resource elements:
Wherein, m indicates that current physical block, n indicate the current sign on Physical Resource Block, Metricm,n,iFor present physical
The corresponding degree of reiability value of the corresponding i-th group of interfered cell parameter combination of current sign on resource block；Metricm,n-1,iFor
The corresponding degree of reiability value of the corresponding i-th group of interfered cell parameter combination of (n-1)th symbol on current physical block, the
N-1 symbol is the previous symbol of current sign；It is corresponding that k ∈ (m, n) is expressed as the current sign on current physical block
All resource elements；rkThe signal vector received for k-th of RE in the current sign on current physical block；ρSFor
The service signal transmission power of serving cell and the ratio of emission power of pilot signal,To estimate obtained serving cell
Channel matrix,For the pre-coding matrix of the serving cell,For the data-signal of serving cell transmission；ρIIt is described
The ratio of the corresponding RE transmission power of the data-signal of interfered cell RE transmission power corresponding with DRS (Dedicated Reference Signal)；
For the channel matrix for estimating obtained interfered cell；The pre-coding matrix that index for interfered cell is i,It is small to interfere
The data-signal of area's transmission.
14. user terminal as claimed in claim 11, which is characterized in that the interfered cell parameter includes: interfered cell
Transmission mode.
15. user terminal as claimed in claim 14, which is characterized in that the interfered cell parameter determination unit, for working as n
When≤j, the transmission mode of the interfered cell is set as the first transmission mode, and determine working as on the current physical block
Other corresponding cell parameters of preceding symbol；When the transmission mode of n=j and the interfered cell is the first transmission mode, setting
As n > j, the transmission mode of the interfered cell is first transmission mode, and is determined on the current physical block
Other corresponding interfered cell parameters of current sign；When the transmission mode of n=j and the interfered cell is not the first transmission mode
When, the transmission mode of the interfered cell as n > j is set as the second transmission mode, and determines the current physical block
On other corresponding interfered cell parameters of current sign；First transmission mode is different from second transmission mode, and n is
The corresponding mark of current sign, j is default value, and 1≤j≤N, N are total symbol numbers of downlink subframe.
16. user terminal as claimed in claim 15, which is characterized in that first transmission mode is Rank1 transmission mode,
Second transmission mode is SFBC transmission mode.
17. user terminal as claimed in claim 16, which is characterized in that further include: calibration unit, for when first biography
When defeated mode is Rank1 transmission mode, in the demodulation for calculating the corresponding serving cell of current sign on current physical block
After log-likelihood ratio, to the demodulation log-likelihood ratio of the corresponding serving cell of current sign on the current physical block
It is calibrated.
18. user terminal as claimed in claim 17, which is characterized in that the calibration unit, for calculating the current object
Manage the corresponding degree of reiability value of current sign on resource block；It obtains and the current sign pair on the current physical block
Corresponding first weighting coefficient of the degree of reiability value answered；It will be on first weighting coefficient and the current physical block
The corresponding demodulation log-likelihood ratio of current sign is multiplied, and obtains the first product；By the defeated of the second weighting coefficient and default receiver
Log-likelihood ratio is multiplied out, obtains the second product；By first product and second product addition, obtain and value conduct
The demodulation log-likelihood ratio of the corresponding serving cell of current sign on current physical block after calibration；Wherein, first adds
The sum of weight coefficient and the second weighting coefficient are 1.
19. user terminal as claimed in claim 11, which is characterized in that the interfered cell parameter includes: interfered cell
Modulation type.
20. user terminal as claimed in claim 19, which is characterized in that the computing unit, for according to the current object
The corresponding modulation type of previous symbol for managing current sign on resource block, calculates the current symbol on the current physical block
The demodulation log-likelihood ratio of number corresponding serving cell.
21. a kind of computer readable storage medium, is stored thereon with computer instruction, which is characterized in that the computer instruction
Perform claim requires 1~10 described in any item serving cell demodulation methods when operation.
22. a kind of electronic equipment, including memory and processor, it is stored with and can runs on the processor on the memory
Computer instruction, which is characterized in that perform claim requires any one of 1~10 when the processor runs the computer instruction
The serving cell demodulation method.
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