CN103312397A - Pre-coding method, system and device - Google Patents
Pre-coding method, system and device Download PDFInfo
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- CN103312397A CN103312397A CN2012100707846A CN201210070784A CN103312397A CN 103312397 A CN103312397 A CN 103312397A CN 2012100707846 A CN2012100707846 A CN 2012100707846A CN 201210070784 A CN201210070784 A CN 201210070784A CN 103312397 A CN103312397 A CN 103312397A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0465—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
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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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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The embodiment of the invention discloses a pre-coding method, which comprises the steps: performing pre-coding preorder processing on a signal to be transmitted, wherein the power of the signal to be transmitted is increased by the preorder processing; selecting a power limitation algorithm according to a selection rule; performing power limitation operation on the signal subjected to preorder processing according to the selected power limitation algorithm; and generating a pre-coded signal according to the signal after the power limitation operation. The embodiment of the invention also discloses a transmitter, a receiver and a pre-coding system. By using the pre-coding method, the transmitter, the receiver and the pre-coding system, the adverse effect of the power limitation operation on the signal transmission can be reduced as much as possible while the transmitting power is limited by using the power limitation operation.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of method for precoding, system and device.
Background technology
MIMO (Multi-Input Multi-Output, multiple-input, multiple-output) technology can improve the capacity of wireless communication system under the condition that does not increase transmitting power, in the systems such as LTE (Long Term Evolution, Long Term Evolution), WiMAX, obtain a wide range of applications.
Precoding is an important branch of MIMO technology, and it can be regarded as a kind of channel pre-equalization techniques in essence.According to channel information data are carried out preliminary treatment at transmitter terminal, can make signal obtain better signal to noise ratio through after the channel, and then obtain preferably performance at receiver end.Precoding algorithm commonly used comprises linear and non-linear two classes, and wherein linear predictive coding refers to that precoding processing can realize by linear operation, implements fairly simple usually.And nonlinear precoding refers to exist in the precoding process nonlinear computing, implements more complicated, but usually also can obtain better performance.
Some nonlinear precoding algorithm, THP (Tomlinson-Harashima precoding for example, Tomlinson-Harrar is wished the agate precoding), VP (Vector Perturbation, the vector perturbation) etc., some treatment steps wherein may make the increase of output power of signal to be sent, must carry out the Power Limitation operation.In presently used nonlinear precoding algorithm, all be to use to ask modulo operation to carry out Power Limitation, still, and in actual applications, because the factors such as estimation error, external interference ask modulo operation usually can cause the performance loss of signal.
Describe for example with the ZF-THP (Zero-Forcing Tomlinson-Harashima precoding, ZF Tomlinson-Harrar is wished the agate precoding) that decomposes based on QR.Fig. 1 is the schematic diagram of existing a kind of emission pusher side method for precoding based on ZF-THP, and Fig. 2 is the schematic diagram of the receiver side method for precoding corresponding with Fig. 1.Ask modulo operation to be equivalent to increase by one at signal and ask the mould side-play amount, make and ask the amplitude of the signal behind the mould to be no more than the target upper limit.But this is asked the mould side-play amount to produce signal and disturbs; even the signal that receives carried out and ask that modulo operation is identical asks the mould recovery operation at receiver side; because the impact of the undesirable and Noise and Interference of feedback and channel estimating; still can not eliminate the impact of asking modulo operation fully, therefore can cause performance loss to the signal transmission.
Summary of the invention
The embodiment of the invention provides a kind of method for precoding, system and device.Can in power-limiting, reduce the Power Limitation operation adverse effect that transmission causes to signal as far as possible.
The embodiment of the invention provides a kind of method for precoding, comprising:
Treat transmitted signal and carry out the processing of precoding preorder, described preorder is processed the increase of output power that makes signal to be sent;
Select the Power Limitation algorithm according to selective rule;
Signal after according to selected Power Limitation algorithm preorder being processed carries out the Power Limitation operation;
According to the signal after the signal generation precoding after the Power Limitation operation.
The embodiment of the invention also provides a kind of method for precoding, comprising:
Receiver/transmitter sends asks mould information;
Judging according to the described mould information of asking whether transmitter has carried out asking modulo operation to the signal after the processing of precoding preorder, is then received signal to be asked the mould recovery operation if be judged as.
The embodiment of the invention also provides a kind of transmitter, comprising:
Precoding preorder processing module is used for treating transmitted signal and carries out the processing of precoding preorder, and described preorder is processed the increase of output power that makes signal to be sent;
The Power Limitation algorithm is selected module, is used for selecting the Power Limitation algorithm according to selective rule;
The Power Limitation module is carried out the Power Limitation operation for the signal after according to selected Power Limitation algorithm preorder being processed;
Signal generation module after the precoding is used for according to the signal after the signal generation precoding after the Power Limitation operation.
The embodiment of the invention also provides a kind of receiver, comprising:
Ask the mould information receiving module, what be used for that receiver/transmitter sends asks mould information;
Ask the mould judge module, be used for judging according to the described mould information of asking whether transmitter has carried out asking modulo operation to the signal after the processing of precoding preorder;
Ask mould to recover module, be used for when the judged result of asking the mould judge module when being, received signal is asked the mould recovery operation.
The embodiment of the invention also provides a kind of pre-coding system, comprises transmitter and receiver, and described transmitter comprises:
Precoding preorder processing module is used for treating transmitted signal and carries out the processing of precoding preorder, and described preorder is processed the increase of output power that makes signal to be sent;
The Power Limitation algorithm is selected module, is used for selecting the Power Limitation algorithm according to selective rule;
The Power Limitation module is carried out the Power Limitation operation for the signal after according to selected Power Limitation algorithm preorder being processed;
Signal generation module after the precoding is used for according to the signal after the signal generation precoding after the Power Limitation operation.
Implement the embodiment of the invention, has following beneficial effect: by adaptively selected different Power Limitation algorithm under different situations, not only control transmitting power to meet the restriction of hardware condition, also reduced as much as possible the adverse effect to signal transmission that the Power Limitation operation causes.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is existing a kind of schematic diagram of launching the pusher side method for precoding;
Fig. 2 is the schematic diagram of existing a kind of receiver side method for precoding;
Fig. 3 is the first embodiment flow chart of the method for precoding of emission pusher side provided by the invention;
Fig. 4 is the second embodiment flow chart of the method for precoding of emission pusher side provided by the invention;
Fig. 5 is the first embodiment flow chart of the method for precoding of receiver side provided by the invention;
Fig. 6 is the first example structure schematic diagram of transmitter provided by the invention;
Fig. 7 is the second example structure schematic diagram of transmitter provided by the invention;
Fig. 8 is the second example structure schematic diagram of receiver provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Seeing also Fig. 3, is the first embodiment flow chart of the method for precoding of emission pusher side provided by the invention, comprising:
At step S300, to treat transmitted signal and carry out the processing of precoding preorder, described preorder is processed the increase of output power that makes signal to be sent.For example, preorder is processed and can be comprised all processing steps that may cause signal power to increase in the precoding algorithm, for example is used for the processing of disturbing between serial erasure signal stream.
At step S301, select the Power Limitation algorithm according to selective rule.For example, selective rule comprises: the Power Limitation algorithm of selectivity loss reduction, wherein performance loss is the communication quality and the difference of not carrying out between the communication quality of Power Limitation when operating that carries out after the Power Limitation operation.Selective rule can also comprise: the Power Limitation algorithm of selecting issuable noise minimum.Can pre-stored multiple power limit algorithm, then under particular condition, select only a kind of according to selective rule.
At step S302, the signal after according to selected Power Limitation algorithm preorder being processed carries out the Power Limitation operation.
At step S303, according to the signal after the signal generation precoding after the Power Limitation operation.Particularly, can carry out some precoding subsequent treatment to the signal after the Power Limitation operation, subsequent treatment can comprise finishes the treatment step that is left after preorder processing and the Power Limitation processing in the precoding algorithm, for example be used for signal stream is mapped to the processing of antenna.
The method for precoding that the embodiment of the invention provides, by adaptively selected different Power Limitation algorithm under different situations, not only control transmitting power to meet the restriction of hardware condition, also reduced as much as possible the adverse effect to signal transmission that the Power Limitation operation causes.
Seeing also Fig. 4, is the second embodiment flow chart of the method for precoding of emission pusher side provided by the invention, comprising:
At step S400, to treat transmitted signal and carry out the processing of precoding preorder, described preorder is processed the increase of output power that makes signal to be sent.Take ZF-THP as example, suppose that the antenna number of transmitting-receiving two-end is symmetrical, be K, signal to be sent is a
1, a
2..., a
K, the precoding preorder is processed and to be comprised: the down channel matrix H that obtains channel matrix H or obtain being similar to according to the channel estimating to ascending pilot frequency according to the feedback of receiver, and H decomposed obtain H=LQ
H, wherein L is a lower triangular matrix that dimension is K * K, and Q is that dimension is the unitary matrice of K * K, and this decomposition can be passed through H
HQR decompose to realize H wherein
HThe conjugate transpose of expression H; Then, obtain matrix B according to B=GL, wherein G is the diagonal matrix that the inverse of the diagonal entry of L forms, so B is that a diagonal entry is 1 lower triangular matrix; According to
K=1,2 ..., K calculates the signal after preorder is processed, wherein u
kSignal after the expression preorder is processed, a
kRepresent signal to be sent, b
KlThe element of the capable l row of the k of expression B, v
lSignal after the operation of expression Power Limitation.Can find out from above processing procedure, because formula the right
This impact, u
kPower can compare a
kPower large, the signal after therefore need to processing the precoding preorder carry out the Power Limitation operation, with limit transmit power.
At step S401, judge whether asking modulo n arithmetic and non-asking to select to ask modulo n arithmetic in the mould Power Limitation algorithm according to selective rule.Ask modulo n arithmetic to comprise: to determine that is asked a mould side-play amount, ask signal sum after mould side-play amount and preorder are processed as the signal of asking after the modulo operation with described, and ask the amplitude of the signal after the modulo operation to be no more than default amplitude threshold.The non-mould Power Limitation algorithm of asking can comprise linear power limit algorithm or other non-linear power limit algorithm except asking modulo n arithmetic, take the linear power limit algorithm as example, this algorithm comprises: determine power confinement factor, signal after described power confinement factor be multiply by preorder and process, or the signal to be sent that comprises in the signal after described power confinement factor be multiply by preorder and process, signal after restriction operates as linear power with the signal after the multiplication calculating, and the power of the signal after the linear power restriction operation is no more than default power threshold.Although ask preferably power-limiting of modulo operation and linear power restriction operation, and, not carrying out the Power Limitation operation compares, the two all can have certain performance loss, but the performance loss that they cause under different situations is different, the performance loss that for example linear power restriction operation causes when channel status and/or channel quality are relatively poor is great, and at channel status and/or channel quality relatively better the time, the performance loss of linear power restriction operation may be again less than asking modulo operation, so selective rule can comprise: select a kind of in asking modulo n arithmetic and linear power limit algorithm according to current channel condition and/or channel quality.For example, at the measured value of one or more indexs of current channel condition and/or channel quality during greater than predetermined threshold value, think that the performance loss of asking modulo operation less than the performance loss of linear power restriction operation, therefore selects to ask modulo n arithmetic; At the measured value of one or more indexs of current channel condition and/or channel quality during less than predetermined threshold value, think that the performance loss of asking modulo operation greater than the performance loss of linear power restriction operation, therefore selects the linear power limit algorithm.Wherein, the index of channel status and/or channel quality comprises between signal to noise ratio, antenna channel relevancy etc. between correlation, user.In order to guarantee better communication quality, can be based on more comprehensive factor when selecting the Power Limitation algorithm, for example step S401 can comprise: the performance loss according to the performance loss of asking modulo n arithmetic and linear power limit algorithm judges whether to select to ask modulo n arithmetic, the below will be example in the hope of modulo n arithmetic and linear power limit algorithm, to how the estimated performance loss elaborates.
Preferably, in step S401, the performance loss of asking modulo n arithmetic is to estimate according to current channel status, channel quality and/or current modulation coding mode.Particularly, can be according to asking the modulo operation performance loss to estimate to adopt this moment the performance loss of asking modulo operation to cause under current channel status and/or channel quality and pre-stored different channels state and/or the channel quality, and/or can be according to asking the modulo operation performance loss to estimate to adopt the performance loss of asking modulo operation to cause this moment under current modulation coding mode and the pre-stored different modulating coded system.The performance loss of asking modulo n arithmetic under different channels state and/or the channel quality or under the different modulating coded system can be determined by methods such as in advance calculating, emulation or measurements.
Preferably, in step S401, the performance loss of linear power limit algorithm is to estimate with respect to the power loss that linear power limits preoperative available signal power according to the available signal power after the linear power restriction operation.For example, suppose that the power confinement factor that calculates according to the method described above is τ
k, then compare with the power that carries out the useful signal before the normalization, the loss (representing take the dB form) of the available signal power after the Power Limitation operation as
Particularly, can limit the power loss of preoperative available signal power with respect to linear power and pre-stored power loss is estimated the performance loss that the linear power restriction operates with the corresponding relation of performance loss according to the available signal power after the linear power restriction operation, the corresponding relation of power loss and performance loss can obtain by methods such as in advance emulation, calculating or measurements.In addition, can also directly the available signal power after the linear power restriction operation be limited the power loss of preoperative available signal power as the performance loss of linear power restriction operation with respect to linear power.
If the judged result among the step S401 is yes, then execution in step S402.At step S402, the signal after the processing of precoding preorder is asked modulo operation, ask modulo operation to comprise the mould side-play amount is asked in one of signal increase after the processing of precoding preorder.Describe as an example of ZF-THP example equally, ask the signal after the modulo operation
K=1,2 ..., K, wherein p
kFor asking the mould side-play amount, by asking modulo operation, v
kReal part and imaginary part all be limited within the specific limits, so its power also will be limited in the target zone.
If the determination result is NO among the step S401, execution in step S403 then.At step S403, the signal after the processing of precoding preorder is carried out the non-mould Power Limitation operation of asking, for example linear power restriction operation.To adopt the linear power restriction to be operating as example in the ZF-THP algorithm, step S403 specifically comprises: determine power confinement factor τ
k, make the signal after the linear power restriction operates
Power be no more than default power threshold.
At step S404, the signal after the Power Limitation operation is carried out the precoding subsequent treatment, the signal after the generation precoding.As an example of ZF-THP example the precoding subsequent treatment is described equally.Subsequent treatment comprises: will ask the signal v after the restriction of modulo operation or linear power operates
k(k=1,2 ... the signal x after the matrix Q that K) obtains in processing with preorder multiplies each other and obtains precoding and finish
k(k=1,2 ... K), i.e. x=Qv, wherein x=x
1, x
2..., X
K H, v=v
1, v
2, v
K H
At step S405, ask mould information to what receiver sent that the signal be used to indicate after whether transmitter has been processed the precoding preorder asks modulo operation.The described mould information of asking can judge whether the signal that receives is asked the mould recovery operation according to the described mould information of asking for described receiver.Receiver is carried out ask mould recovery operation and transmitter execution ask modulo operation identical.Owing to asking modulo operation to cause interference to useful signal, in order to alleviate the performance loss of asking modulo operation, need to carry out to the signal that receives at receiver side that pusher side is identical asks the mould recovery operation to recover with emission; If but the Power Limitation algorithm of emission pusher side is the linear power restriction of adopting, just not be used in receiver side and ask the mould recovery operation to recover to the signal execution that receives again.Therefore; ask mould information by what send to receiver that signal after whether the precoding preorder being processed asks modulo operation; can reduce better the performance loss of signal transmission, avoid receiver side to carry out the unnecessary loss of asking the mould recovery operation to bring, improve the quality of communication.
Although the present embodiment illustrates as an example of ZF-THP example, the present invention is not limited to ZF-THP precoding algorithm, and goes for may causing transmitting arbitrarily the precoding algorithm of performance loss.For example, at another kind of nonlinear precoding algorithm MMSE-THP (Minimum Mean Square Error Tomlinson-Harashima precoding, least mean-square error Tomlinson-Harrar is wished the agate precoding) in, preorder is processed and to be comprised: by to matrix
QR decompose and to obtain matrix Q and matrix B, wherein
Be the noise power of receiver,
Power for the signal v after the Power Limitation operation;
The pseudoinverse of representing matrix H is if the line number of H is more than or equal to columns, then
If the columns of H is greater than line number, then
Other steps and the ZF-THP of this algorithm are similar, compare with ZF-THP, and this algorithm has been considered the Noise and Interference of receiver side.For asking mould information, busy channel sends separately, also can send with other communication necessary signals.The communication necessary signals of asking mould information with other is sent, can not need the outer channel resource of occupying volume.The below will ask the method for mould information to carry out brief description to transmission as an example of the LTE communication system example.
Preferably, among the step S405, ask mould information to be included in the descending control signaling that is used to indicate descending scheduling.Particularly, can be at PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) in, to ask mould information to send with the schedule information that is used to indicate descending scheduling, whether carried out asking modulo operation in order to indicate the indicated PDSCH of this schedule information (Physical Downlink Shared Channel, Physical Downlink Shared Channel) code word.Wherein, PDSCH is used for carrying from the data of transmission channel DSCH (Downlink Shared Channel, DSCH Downlink Shared Channel), is the carrier of DSCH, and the PDSCH code word is the signal that transmitter sends.
Preferably, among the step S405, ask mould information can also lie in UE (User Equipment, the subscriber equipment) DRS (Dedicated Reference Signal).Particularly, suppose that the UE DRS (Dedicated Reference Signal) on the antenna port p is a
(p)If the emission pusher side has carried out asking mould to the data of this antenna port transmission, then order
If the emission pusher side is not asked mould to the data of this antenna port transmission, then order
Also can adopt opposite processing, namely ought not ask mould seasonal
Ask mould seasonal
After mould information is asked in loading in this manner, use
Replace a
(p)Carry out precoding and transmission as new UE DRS (Dedicated Reference Signal).The below still explains the reasonability of the method as an example of ZF-THP example.Ideally, after the UE DRS (Dedicated Reference Signal) arrived receiver, its equivalent channel was the diagonal entry of L, and by the characteristic of Matrix QR Decomposition as can be known, can make the diagonal entry of L be always arithmetic number (or negative real number).Therefore, emission pusher side UE is when carrying out channel estimating, can suppose all the time equivalent channel (or diagonal entry of L) for arithmetic number (or negative real number), and multiply by 1 (1) and-1 (1) by the data symbol with the UE DRS (Dedicated Reference Signal) and represent respectively and ask mould and do not ask the mould both of these case.Like this, receiver side UE just can determine by detecting the symbol of UE reference signal whether the data on the corresponding antenna port of this UE reference signal have carried out asking modulo operation.For example, when the frequency pilot sign of UE DRS (Dedicated Reference Signal) is timing, ask mode table to show that receiver need to ask modulo operation to the signal that receives; When the frequency pilot sign of UE DRS (Dedicated Reference Signal) when negative, ask mode table to show that receiver does not need the signal that receives is asked modulo operation; Wherein, the equivalent channel of UE DRS (Dedicated Reference Signal) is defaulted as arithmetic number.
Seeing also Fig. 5, is the first embodiment flow chart of the method for precoding of receiver side provided by the invention, comprising:
At step S500, receiver/transmitter sends asks mould information.
Preferably, among the step S500, ask mould information to be included in the descending control signaling that is used to indicate descending scheduling.
Preferably, among the step S500, ask mould information to lie in the UE DRS (Dedicated Reference Signal).
At step S501, judge according to the described mould information of asking whether transmitter has carried out asking modulo operation to the signal after the processing of precoding preorder.For example, if ask mould information to lie in the UE DRS (Dedicated Reference Signal), can carry out channel estimating to the equivalent channel of user equipment specific reference signal, and judge that according to the symbol of real part of the equivalent channel of the user equipment specific reference signal of acquiescence the factor of taking advantage of on the user equipment specific reference signal is 1 still-1, thereby judge the implication of asking mould information.For example, when the frequency pilot sign of UE DRS (Dedicated Reference Signal) is timing, ask mode table to show that receiver need to ask modulo operation to the signal that receives; When the frequency pilot sign of UE DRS (Dedicated Reference Signal) when negative, ask mode table to show that receiver does not need the signal that receives is asked modulo operation; Wherein, the equivalent channel of UE DRS (Dedicated Reference Signal) is defaulted as arithmetic number.
If the judged result of step S501 is yes, then execution in step S502.At step S502, received signal is asked the mould recovery operation.Preferably, ask the process of mould recovery operation identical with the described modulo operation of asking.
If the determination result is NO for step S501, then this method flow process finishes.
The method for precoding that the embodiment of the invention provides; by asking mould information to judge whether the signal that receives is asked the mould recovery operation; not only reduce the adverse effect to signal transmission that the Power Limitation operation causes, and avoided carrying out the unnecessary mould recovery operation asked.
Seeing also Fig. 6, is the first example structure schematic diagram of transmitter provided by the invention, and described transmitter comprises:
Precoding preorder processing module 610 is used for treating transmitted signal and carries out the processing of precoding preorder, and described preorder is processed the increase of output power that makes signal to be sent.For example, preorder is processed and can be comprised all processing steps that may cause signal power to increase in the precoding algorithm, for example is used for the processing of serial interference between erasure signal stream.
The Power Limitation algorithm is selected module 620, is used for selecting the Power Limitation algorithm according to selective rule.For example, selective rule comprises: the Power Limitation algorithm of selectivity loss reduction, wherein performance loss is the communication quality and the difference of not carrying out between the communication quality of Power Limitation when operating that carries out after the Power Limitation operation.Selective rule can also comprise: the Power Limitation algorithm of selecting issuable noise minimum.The Power Limitation algorithm selects module 620 to select only a kind of under particular condition from pre-stored Power Limitation algorithm according to selective rule.
The transmitter that the embodiment of the invention provides, by adaptively selected different Power Limitation algorithm under different situations, not only control transmitting power to meet the restriction of hardware condition, also reduced as much as possible the adverse effect to signal transmission that the Power Limitation operation causes.
Seeing also Fig. 7, is the second example structure schematic diagram of transmitter provided by the invention, and described transmitter comprises:
Precoding preorder processing module 710 is used for treating transmitted signal and carries out the processing of precoding preorder, and described preorder is processed the increase of output power that makes signal to be sent.Take ZF-THP as example, suppose that the antenna number of transmitting-receiving two-end is symmetrical, be K, signal to be sent is a
1, a
2..., a
K, the precoding preorder is processed and to be comprised: the down channel matrix H that obtains channel matrix H or obtain being similar to according to the channel estimating to ascending pilot frequency according to the feedback of receiver, and H decomposed obtain H=LQ
H, wherein L is a lower triangular matrix that dimension is K * K, and Q is that dimension is the unitary matrice of K * K, and this decomposition can be passed through H
HQR decompose to realize H wherein
HThe conjugate transpose of expression H; Then, obtain matrix B according to B=GL, wherein G is the diagonal matrix that the inverse of the diagonal entry of L forms, so B is that a diagonal entry is 1 lower triangular matrix; According to
K=1,2 ..., K calculates the signal after preorder is processed, wherein u
kSignal after the expression preorder is processed, a
kRepresent signal to be sent, b
KlThe element of the capable l row of the k of expression B, v
lSignal after the operation of expression Power Limitation.Can find out from above processing procedure, because formula the right
This impact, u
kPower can compare a
kPower large, the signal after therefore need to processing the precoding preorder carry out the Power Limitation operation, with limit transmit power.
The Power Limitation algorithm is selected module 720, is used for judging whether asking modulo n arithmetic and the non-mould Power Limitation algorithm of asking to select to ask modulo n arithmetic according to selective rule.Ask modulo n arithmetic to comprise: to determine that is asked a mould side-play amount, ask signal sum after mould side-play amount and preorder are processed as the signal of asking after the modulo operation with described, and ask the amplitude of the signal after the modulo operation to be no more than default amplitude threshold.The non-mould Power Limitation algorithm of asking can comprise linear power limit algorithm or other non-linear power limit algorithm except asking modulo n arithmetic, take the linear power limit algorithm as example, this algorithm comprises: determine power confinement factor, signal after described power confinement factor be multiply by preorder and process, or the signal to be sent that comprises in the signal after described power confinement factor be multiply by preorder and process, signal after restriction operates as linear power with the signal after the multiplication calculating, and the power of the signal after the linear power restriction operation is no more than default power threshold.Although ask preferably power-limiting of modulo operation and linear power restriction operation, and, not carrying out the Power Limitation operation compares, the two all can have certain performance loss, but the performance loss that they cause under different situations is different, the performance loss that for example linear power restriction operation causes when channel status and/or channel quality are relatively poor is great, and at channel status and/or channel quality relatively better the time, the performance loss of linear power restriction operation may be again less than asking modulo operation, so selective rule can comprise: select a kind of in asking modulo n arithmetic and linear power limit algorithm according to current channel condition and/or channel quality.For example, at the measured value of one or more indexs of current channel condition and/or channel quality during greater than predetermined threshold value, think that the performance loss of asking modulo operation limits the performance loss of operation less than linear power, so the Power Limitation algorithm selects module 720 to select to ask modulo n arithmetic; At the measured value of one or more indexs of current channel condition and/or channel quality during less than predetermined threshold value, think that the performance loss of asking modulo operation limits the performance loss of operation greater than linear power, so the Power Limitation algorithm selects module 720 to select the linear power limit algorithm.Wherein, the index of channel status and/or channel quality comprises between signal to noise ratio, antenna channel relevancy etc. between correlation, user.In order to guarantee better communication quality, Power Limitation algorithm selection module 720 can be based on more comprehensive factor when selecting the Power Limitation algorithm, for example limit algorithm selects module 720 can judge whether according to the performance loss of the performance loss of asking modulo n arithmetic and linear power limit algorithm to select to ask modulo n arithmetic, the below will be example in the hope of modulo n arithmetic and linear power limit algorithm, and the Power Limitation algorithm is selected module 720, and how the estimated performance loss elaborates.
Preferably, the Power Limitation algorithm selects module 720 can ask according to current channel status, channel quality and/or current modulation coding mode estimation the performance loss of modulo n arithmetic.Particularly, the Power Limitation algorithm selects the module 720 can be according to asking the modulo operation performance loss to estimate to adopt this moment the performance loss of asking modulo operation to cause under current channel status and/or channel quality and pre-stored different channels state and/or the channel quality, and/or can be according to asking the modulo operation performance loss to estimate to adopt the performance loss of asking modulo operation to cause this moment under current modulation coding mode and the pre-stored different modulating coded system.The performance loss of asking modulo n arithmetic under different channels state and/or the channel quality or under the different modulating coded system can be determined by methods such as in advance calculating, emulation or measurements.
Preferably, the Power Limitation algorithm selects module 720 can estimate according to the power loss that the available signal power after the linear power restriction operation limits preoperative available signal power with respect to linear power the performance loss of linear power limit algorithm.For example, suppose that the power confinement factor that calculates according to the method described above is τ
k, then compare with the power that carries out the useful signal before the normalization, the loss (representing take the dB form) of the available signal power after the Power Limitation operation as
Particularly, the Power Limitation algorithm selects module 720 to limit the power loss of preoperative available signal power with respect to linear power and pre-stored power loss is estimated the performance loss that the linear power restriction operates with the corresponding relation of performance loss according to the available signal power after the linear power restriction operation, and the corresponding relation of power loss and performance loss can obtain by methods such as in advance emulation, calculating or measurements.In addition, the Power Limitation algorithm selects module 720 directly the available signal power after the linear power restriction operation to be limited the power loss of preoperative available signal power as the performance loss of linear power restriction operation with respect to linear power.
Ask mould module 730, the judged result that is used for selecting module 720 when the Power Limitation algorithm is when being, the signal after the precoding preorder processed is asked modulo operation, asks modulo operation to comprise the mould side-play amount is asked in one of signal increase after the processing of precoding preorder.Describe as an example of ZF-THP example equally, ask the signal after the modulo operation
K=1,2 ..., K, wherein p
kFor asking the mould side-play amount, by asking modulo operation, v
kReal part and imaginary part all be limited within the specific limits, so its power also will be limited in the target zone.
The non-mould Power Limitation module 740 of asking is used for when the Power Limitation algorithm is selected module 720 the determination result is NO, and the signal after the precoding preorder is processed carries out the non-mould Power Limitation operation of asking, and for example the linear power restriction operates.Take ZF-THP as example, linear power restriction operation comprises: determine power confinement factor τ
k, make the signal after the linear power restriction operates
Power be no more than default power threshold.
Ask mould information sending module 760; be used for to what receiver sent that the signal that is used to indicate after whether transmitter has been processed the precoding preorder asks modulo operation asking mould information, so that described receiver judges whether the signal that receives is asked the mould recovery operation according to the described mould information of asking.Receiver is carried out ask mould recovery operation and transmitter execution ask modulo operation identical.Owing to asking modulo operation to cause interference to useful signal, in order to alleviate the performance loss of asking modulo operation, need to carry out to the signal that receives at receiver side that pusher side is identical asks the mould recovery operation to recover with emission; If but the Power Limitation algorithm of emission pusher side is the linear power restriction of adopting, just not be used in receiver side and ask the mould recovery operation to recover to the signal execution that receives again.Therefore; ask mould information by what send to receiver that signal after whether the precoding preorder being processed asks modulo operation; can reduce better the performance loss of signal transmission, avoid receiver side to carry out the unnecessary loss of asking the mould recovery operation to bring, improve the quality of communication.
Although the present embodiment illustrates as an example of ZF-THP example, the present invention is not limited to ZF-THP precoding algorithm, and goes for may causing transmitting arbitrarily the precoding algorithm of performance loss.For example, at another kind of nonlinear precoding algorithm MMSE-THP (Minimum Mean Square Error Tomlinson-Harashima precoding, least mean-square error Tomlinson-Harrar is wished the agate precoding) in, preorder is processed and to be comprised: by to matrix
QR decompose and to obtain matrix Q and matrix B, wherein
Be the noise power of receiver,
Power for the signal v after the Power Limitation operation;
The pseudoinverse of representing matrix H is if the line number of H is more than or equal to columns, then
If the columns of H is greater than line number, then
Other steps and the ZF-THP of this algorithm are similar, compare with ZF-THP, and this algorithm has been considered the Noise and Interference of receiver side.For asking mould information, busy channel sends separately, also can send with other communication necessary signals.The communication necessary signals of asking mould information with other is sent, can not need the outer channel resource of occupying volume.The below will ask the method for mould information to carry out brief description to asking mould information sending module 760 to send as an example of the LTE communication system example.
Preferably, ask mould information sending module 760 to send asking mould information to be included in to be used to indicate in the descending control signaling of descending scheduling.Particularly, ask the mould information sending module 760 can be at PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) in, to ask mould information to send with the schedule information that is used to indicate descending scheduling, whether carried out asking modulo operation in order to indicate the indicated PDSCH of this schedule information (Physical Downlink Shared Channel, Physical Downlink Shared Channel) code word.Wherein, PDSCH is used for carrying from the data of transmission channel DSCH (Downlink Shared Channel, DSCH Downlink Shared Channel), is the carrier of DSCH, and the PDSCH code word is the signal that transmitter sends.
Preferably, ask mould information sending module 760 to send asking mould information to lie in UE (User Equipment, the subscriber equipment) DRS (Dedicated Reference Signal).Particularly, suppose that the UE DRS (Dedicated Reference Signal) on the antenna port p is a
(p)If the emission pusher side has carried out asking mould to the data of this antenna port transmission, then order
If the emission pusher side is not asked mould to the data of this antenna port transmission, then order
Also can adopt opposite processing, namely ought not ask mould seasonal
Ask mould seasonal
After mould information is asked in loading in this manner, use
Replace a
(p)Carry out precoding and transmission as new UE DRS (Dedicated Reference Signal).The below still explains the reasonability of the method as an example of ZF-THP example.Ideally, after the UE DRS (Dedicated Reference Signal) arrived receiver, its equivalent channel was the diagonal entry of L, and by the characteristic of Matrix QR Decomposition as can be known, can make the diagonal entry of L be always arithmetic number (or negative real number).Therefore, emission pusher side UE is when carrying out channel estimating, can suppose all the time equivalent channel (or diagonal entry of L) for arithmetic number (or negative real number), and multiply by 1 (1) and-1 (1) by the data symbol with the UE DRS (Dedicated Reference Signal) and represent respectively and ask mould and do not ask the mould both of these case.Like this, receiver side UE just can determine by detecting the symbol of UE reference signal whether the data on the corresponding antenna port of this UE reference signal have carried out asking modulo operation.For example, when the frequency pilot sign of UE DRS (Dedicated Reference Signal) is timing, ask mode table to show that receiver need to ask modulo operation to the signal that receives; When the frequency pilot sign of UE DRS (Dedicated Reference Signal) when negative, ask mode table to show that receiver does not need the signal that receives is asked modulo operation; Wherein, the equivalent channel of UE DRS (Dedicated Reference Signal) is defaulted as arithmetic number.
Seeing also Fig. 8, is the first example structure schematic diagram of receiver provided by the invention, and described receiver comprises:
Ask mould information receiving module 810, what be used for that receiver/transmitter sends asks mould information.
Preferably, ask mould information to be included in the descending control signaling that is used to indicate descending scheduling.
Preferably, ask mould information to lie in the UE DRS (Dedicated Reference Signal).
Ask mould judge module 820, be used for judging according to the described mould information of asking whether transmitter has carried out asking modulo operation to the signal after the processing of precoding preorder.
Preferably, ask mould judge module 820 to carry out channel estimating to the equivalent channel of user equipment specific reference signal, and judge that according to the symbol of real part of the equivalent channel of the user equipment specific reference signal of acquiescence the factor of taking advantage of on the user equipment specific reference signal is 1 still-1, thereby judge the implication of asking mould information.For example, when the frequency pilot sign of UE DRS (Dedicated Reference Signal) is timing, ask mode table to show that receiver need to ask modulo operation to the signal that receives; When the frequency pilot sign of UE DRS (Dedicated Reference Signal) when negative, ask mode table to show that receiver does not need the signal that receives is asked modulo operation; Wherein, the equivalent channel of UE DRS (Dedicated Reference Signal) is defaulted as arithmetic number.。
Ask mould to recover module 830, be used for when asking mould to judge mould, 820 judged result is asked the mould recovery operation to received signal when being.Preferably, ask that mould recovers that module 830 carries out ask the mould recovery operation with ask the execution of mould module ask modulo operation identical.
The receiver that the embodiment of the invention provides; ask mould information to judge whether the signal that receives is asked the mould recovery operation by basis; not only reduce the adverse effect to signal transmission that the Power Limitation operation causes, and avoided carrying out the unnecessary mould recovery operation asked.
The method for precoding that the present invention also provides a kind of pre-coding system and carried out by this pre-coding system, this pre-coding system comprises the described transmitter and receiver of above any embodiment.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed only is a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and according to the equivalent variations that claim of the present invention is done, still belong to the scope that invention is contained.
Claims (19)
1. a method for precoding is characterized in that, comprising:
Treat transmitted signal and carry out the processing of precoding preorder, described preorder is processed the increase of output power that makes signal to be sent;
Select the Power Limitation algorithm according to selective rule;
Signal after according to selected Power Limitation algorithm preorder being processed carries out the Power Limitation operation;
According to the signal after the signal generation precoding after the Power Limitation operation.
2. method for precoding according to claim 1, it is characterized in that, described selective rule comprises: the Power Limitation algorithm of selectivity loss reduction, described performance loss are the communication qualities and the difference of not carrying out between the communication quality of Power Limitation when operating that carries out after the Power Limitation operation.
3. method for precoding according to claim 1 and 2 is characterized in that, described Power Limitation algorithm comprises asks modulo n arithmetic and the non-mould Power Limitation algorithm of asking;
Describedly select the step of Power Limitation algorithm to comprise according to selective rule: according to selective rule ask modulo n arithmetic and non-ask select in the mould Power Limitation algorithm a kind of.
4. method for precoding according to claim 3 is characterized in that, described method also comprises: ask mould information to what receiver sent that the signal be used to indicate after whether transmitter has been processed the precoding preorder asks modulo operation.
5. method for precoding according to claim 1, it is characterized in that, described step according to the signal after the signal generation precoding after the Power Limitation operation specifically comprises: the signal after the Power Limitation operation is carried out the precoding subsequent treatment, the signal after the generation precoding.
6. method according to claim 3, it is characterized in that, the described non-mould Power Limitation algorithm of asking comprises the linear power limit algorithm, described linear power limit algorithm comprises: determine power confinement factor, signal after described power confinement factor be multiply by preorder and process, or the signal to be sent that comprises in the signal after described power confinement factor be multiply by preorder and process, signal after multiplication calculated is as the non-signal of asking after the operation of mould Power Limitation, and the described non-power of the signal after the operation of mould Power Limitation of asking is no more than default power threshold.
7. method for precoding according to claim 2, it is characterized in that, described Power Limitation Algorithm Performance loss is to estimate with respect to the power loss of the preoperative available signal power of this Power Limitation according to the available signal power after Power Limitation operation corresponding to this Power Limitation algorithm.
8. method for precoding according to claim 3 is characterized in that, describedly asks the performance loss of modulo n arithmetic to estimate according to current channel status, channel quality or current modulation coding mode.
9. method for precoding according to claim 4 is characterized in that, the described mould information of asking is included in the descending control signaling that is used to indicate descending scheduling.
10. method for precoding according to claim 4 is characterized in that, the described mould information of asking lies in the user equipment specific reference signal.
11. method for precoding according to claim 10, it is characterized in that, the described symbol of asking the mould information exchange to cross described user equipment specific reference signal multiply by 1 or-1 expression, and the symbol of the real part of the equivalent channel of wherein said user equipment specific reference signal is defaulted as plus or minus.
12. a method for precoding is characterized in that, comprising:
Receiver/transmitter sends asks mould information;
Judging according to the described mould information of asking whether transmitter has carried out asking modulo operation to the signal after the processing of precoding preorder, is then received signal to be asked the mould recovery operation if be judged as.
13. method for precoding according to claim 12 is characterized in that, the described mould information of asking lies in the user equipment specific reference signal;
Describedly judge that according to the described mould information of asking the signal after whether transmitter is processed the precoding preorder has carried out asking the step of modulo operation specifically to comprise:
Equivalent channel to the user equipment specific reference signal is carried out channel estimating, and the factor of taking advantage of on the symbol decision user equipment specific reference signal of real part according to the equivalent channel of the user equipment specific reference signal of acquiescence is 1 still-1.
14. a transmitter is characterized in that, comprising:
Precoding preorder processing module is used for treating transmitted signal and carries out the processing of precoding preorder, and described preorder is processed the increase of output power that makes signal to be sent;
The Power Limitation algorithm is selected module, is used for selecting the Power Limitation algorithm according to selective rule;
The Power Limitation module is carried out the Power Limitation operation for the signal after according to selected Power Limitation algorithm preorder being processed;
Signal generation module after the precoding is used for according to the signal after the signal generation precoding after the Power Limitation operation.
15. transmitter according to claim 14, it is characterized in that, described Power Limitation algorithm comprises asks modulo n arithmetic and the non-mould Power Limitation algorithm of asking, and described Power Limitation algorithm selects module to be used for asking modulo n arithmetic and non-to ask mould Power Limitation algorithm to select a kind of according to selective rule.
16. transmitter according to claim 14 is characterized in that, described transmitter also comprises:
Ask the mould information sending module, be used for to what receiver sent that the signal that is used to indicate after whether transmitter has been processed the precoding preorder asks modulo operation asking mould information.
17. a receiver is characterized in that, comprising:
Ask the mould information receiving module, what be used for that receiver/transmitter sends asks mould information;
Ask the mould judge module, be used for judging according to the described mould information of asking whether transmitter has carried out asking modulo operation to the signal after the processing of precoding preorder;
Ask mould to recover module, be used for when the judged result of asking the mould judge module when being, received signal is asked the mould recovery operation.
18. a pre-coding system comprises transmitter and receiver, it is characterized in that, described transmitter comprises:
Precoding preorder processing module is used for treating transmitted signal and carries out the processing of precoding preorder, and described preorder is processed the increase of output power that makes signal to be sent;
The Power Limitation algorithm is selected module, is used for selecting the Power Limitation algorithm according to selective rule;
The Power Limitation module is carried out the Power Limitation operation for the signal after according to selected Power Limitation algorithm preorder being processed;
Signal generation module after the precoding is used for according to the signal after the signal generation precoding after the Power Limitation operation.
19. pre-coding system according to claim 18 is characterized in that,
Described transmitter also comprises:
Ask the mould information sending module, be used for to what receiver sent that the signal that is used to indicate after whether transmitter has been processed the precoding preorder asks modulo operation asking mould information;
Described receiver comprises:
Ask the mould information receiving module, what be used for that receiver/transmitter sends asks mould information;
Ask the mould judge module, be used for judging according to the described mould information of asking whether transmitter asks modulo operation to the signal after the processing of precoding preorder;
Ask mould to recover module, be used for when the judged result of asking the mould judge module when being, received signal is asked the mould recovery operation.
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| PCT/CN2012/087027 WO2013135084A1 (en) | 2012-03-16 | 2012-12-20 | Method, system and apparatus for precoding |
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