CN103312397A - Pre-coding method, system and device - Google Patents

Pre-coding method, system and device Download PDF

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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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signal
power
modulo
algorithm
precoding
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贾明
谭仕能
陈磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2012100707846A priority Critical patent/CN103312397A/en
Priority to PCT/CN2012/087027 priority patent/WO2013135084A1/en
Priority to RU2015144478A priority patent/RU2632417C2/en
Publication of CN103312397A publication Critical patent/CN103312397A/en
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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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

本发明实施例公开了一种预编码方法，包括：对待发送信号进行预编码前序处理，所述前序处理使待发送信号的功率增大；根据选择规则选择功率限制算法；根据所选的功率限制算法对前序处理后的信号进行功率限制操作；根据功率限制操作后的信号生成预编码后的信号。本发明实施例还公开了一种发射机、接收机和预编码系统。采用本发明，可在利用功率限制操作限制发射功率的同时尽量减小功率限制操作对信号传输造成的不利影响。

Figure 201210070784

The embodiment of the present invention discloses a precoding method, including: performing precoding pre-processing on the signal to be transmitted, the pre-processing increases the power of the signal to be transmitted; selecting a power limit algorithm according to the selection rule; The power limiting algorithm performs a power limiting operation on the signal after the pre-order processing; generates a precoded signal according to the signal after the power limiting operation. The embodiment of the invention also discloses a transmitter, a receiver and a precoding system. By adopting the present invention, it is possible to limit the transmitting power by using the power limiting operation, and at the same time reduce the adverse effect of the power limiting operation on signal transmission as much as possible.

Figure 201210070784

Description

A kind of method for precoding, system and device
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
Figure BDA0000144301840000051
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
Figure BDA0000144301840000071
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
Figure BDA0000144301840000072
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
Figure BDA0000144301840000081
QR decompose and to obtain matrix Q and matrix B, wherein
Figure BDA0000144301840000082
Figure BDA0000144301840000083
Be the noise power of receiver,
Figure BDA0000144301840000084
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
Figure BDA0000144301840000086
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
Figure BDA0000144301840000091
If the emission pusher side is not asked mould to the data of this antenna port transmission, then order
Figure BDA0000144301840000092
Also can adopt opposite processing, namely ought not ask mould seasonal
Figure BDA0000144301840000093
Ask mould seasonal
Figure BDA0000144301840000094
After mould information is asked in loading in this manner, use
Figure BDA0000144301840000095
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.
Power Limitation module 630 is carried out the Power Limitation operation for the signal after according to selected Power Limitation algorithm preorder being processed.
Signal generation module 640 after the precoding is used for according to the signal after the signal generation precoding after the Power Limitation operation.Particularly, signal generation module 640 can carry out some precoding subsequent treatment to the signal after the Power Limitation operation after the precoding, 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 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
Figure BDA0000144301840000111
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
Figure BDA0000144301840000112
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
Figure BDA0000144301840000132
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
Figure BDA0000144301840000133
Power be no more than default power threshold.
Signal generation module 740 after the precoding is used for asking the signal after the restriction of modulo operation or linear power operates to carry 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
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
Figure BDA0000144301840000142
Figure BDA0000144301840000143
Be the noise power of receiver,
Figure BDA0000144301840000144
Power for the signal v after the Power Limitation operation;
Figure BDA0000144301840000145
The pseudoinverse of representing matrix H is if the line number of H is more than or equal to columns, then
Figure BDA0000144301840000146
If the columns of H is greater than line number, then
Figure BDA0000144301840000147
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
Figure BDA0000144301840000151
If the emission pusher side is not asked mould to the data of this antenna port transmission, then order
Figure BDA0000144301840000152
Also can adopt opposite processing, namely ought not ask mould seasonal
Figure BDA0000144301840000153
Ask mould seasonal
Figure BDA0000144301840000154
After mould information is asked in loading in this manner, use
Figure BDA0000144301840000155
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)

1.一种预编码方法，其特征在于，包括：1. A precoding method, characterized in that, comprising: 对待发送信号进行预编码前序处理，所述前序处理使待发送信号的功率增大；performing precoding preamble processing on the signal to be transmitted, the preamble processing increases the power of the signal to be transmitted; 根据选择规则选择功率限制算法；Select a power limiting algorithm according to a selection rule; 根据所选的功率限制算法对前序处理后的信号进行功率限制操作；Perform a power limit operation on the pre-processed signal according to the selected power limit algorithm; 根据功率限制操作后的信号生成预编码后的信号。A precoded signal is generated from the power-limited signal. 2.根据权利要求1所述的预编码方法，其特征在于，所述选择规则包括：选择性能损失最小的功率限制算法，所述性能损失是进行功率限制操作后的通信质量与不进行功率限制操作时的通信质量之间的差值。2. The precoding method according to claim 1, wherein the selection rule comprises: selecting a power limitation algorithm with the smallest performance loss, and the performance loss is the difference between the communication quality after the power limitation operation and that without power limitation The difference between the communication quality at the time of operation. 3.根据权利要求1或2所述的预编码方法，其特征在于，所述功率限制算法包括求模算法和非求模功率限制算法；3. The precoding method according to claim 1 or 2, wherein the power limitation algorithm comprises a modulo algorithm and a non-modulo power limitation algorithm; 所述根据选择规则选择功率限制算法的步骤包括：根据选择规则在求模算法和非求模功率限制算法中选择一种。The step of selecting a power limiting algorithm according to a selection rule includes: selecting one of a modulo algorithm and a non-modulo power limit algorithm according to a selection rule. 4.根据权利要求3所述的预编码方法，其特征在于，所述方法还包括：向接收机发送用于指示发射机是否已经对预编码前序处理后的信号进行求模操作的求模信息。4. The precoding method according to claim 3, characterized in that, the method further comprises: sending to the receiver a modulo signal indicating whether the transmitter has performed a modulo operation on the pre-coded pre-processed signal information. 5.根据权利要求1所述的预编码方法，其特征在于，所述根据功率限制操作后的信号生成预编码后的信号的步骤具体包括：对功率限制操作后的信号进行预编码后续处理，生成预编码后的信号。5. The precoding method according to claim 1, wherein the step of generating the precoded signal according to the signal after the power limitation operation specifically comprises: performing precoding subsequent processing on the signal after the power limitation operation, A precoded signal is generated. 6.根据权利要求3所述的方法，其特征在于，所述非求模功率限制算法包括线性功率限制算法，所述线性功率限制算法包括：确定功率限制因子，将所述功率限制因子乘以前序处理后的信号，或将所述功率限制因子乘以前序处理后的信号中所包含的待发送信号，将乘法计算后的信号作为非求模功率限制操作后的信号，且所述非求模功率限制操作后的信号的功率不超过预设的功率阈值。6. The method according to claim 3, wherein the non-modulo power limiting algorithm comprises a linear power limiting algorithm, and the linear power limiting algorithm comprises: determining a power limiting factor, multiplying the power limiting factor by The pre-processed signal, or the signal to be sent contained in the pre-processed signal is multiplied by the power limiting factor, and the multiplied signal is used as the signal after the non-modulo power limiting operation, and the non-computation The power of the signal after the modulo power limiting operation does not exceed a preset power threshold. 7.根据权利要求2所述的预编码方法，其特征在于，所述功率限制算法的性能损失是根据该功率限制算法对应的功率限制操作后的有用信号功率相对于该功率限制操作前的有用信号功率的功率损失估算的。7. The precoding method according to claim 2, characterized in that, the performance loss of the power limit algorithm is based on the useful signal power after the power limit operation corresponding to the power limit algorithm relative to the useful signal power before the power limit operation The power loss of the signal power is estimated. 8.根据权利要求3所述的预编码方法，其特征在于，所述求模算法的性能损失根据当前的信道状态、信道质量或当前的调制编码方式进行估算。8. The precoding method according to claim 3, wherein the performance loss of the modulo algorithm is estimated according to the current channel state, channel quality or current modulation and coding scheme. 9.根据权利要求4所述的预编码方法，其特征在于，所述求模信息包含在用于指示下行调度的下行控制信令中。9. The precoding method according to claim 4, wherein the modulo information is included in downlink control signaling used to indicate downlink scheduling. 10.根据权利要求4所述的预编码方法，其特征在于，所述求模信息隐含在用户设备专用参考信号中。10. The precoding method according to claim 4, wherein the modulo information is implicitly contained in a user equipment specific reference signal. 11.根据权利要求10所述的预编码方法，其特征在于，所述求模信息通过对所述用户设备专用参考信号的符号乘以1或-1表示，其中所述用户设备专用参考信号的等效信道的实部的符号默认为正或负。11. The precoding method according to claim 10, wherein the modulo information is represented by multiplying the sign of the user equipment-specific reference signal by 1 or -1, wherein the sign of the user equipment-specific reference signal The sign of the real part of the equivalent channel is positive or negative by default. 12.一种预编码方法，其特征在于，包括：12. A precoding method, comprising: 接收发射机发送的求模信息；Receive the modulus information sent by the transmitter; 根据所述求模信息判断发射机是否对预编码前序处理后的信号进行了求模操作，若判断为是，则对所接收信号进行求模恢复操作。It is judged according to the modulo information whether the transmitter has performed a modulo operation on the pre-coded pre-processed signal, and if the judgment is yes, then a modulo recovery operation is performed on the received signal. 13.根据权利要求12所述的预编码方法，其特征在于，所述求模信息隐含在用户设备专用参考信号；13. The precoding method according to claim 12, characterized in that, the modulo information is implicit in the user equipment dedicated reference signal; 所述根据所述求模信息判断发射机是否对预编码前序处理后的信号进行了求模操作的步骤具体包括：The step of judging whether the transmitter has performed a modulo operation on the signal processed by the precoding preorder according to the modulo information includes: 对用户设备专用参考信号的等效信道进行信道估计，并根据默认的用户设备专用参考信号的等效信道的实部的符号判断用户设备专用参考信号上所乘的因子为1还是-1。Perform channel estimation on the equivalent channel of the user equipment-specific reference signal, and judge whether the factor multiplied by the user equipment-specific reference signal is 1 or -1 according to the sign of the real part of the default equivalent channel of the user equipment-specific reference signal. 14.一种发射机，其特征在于，包括：14. A transmitter, characterized in that it comprises: 预编码前序处理模块，用于对待发送信号进行预编码前序处理，所述前序处理使待发送信号的功率增大；The precoding preamble processing module is used to perform precoding preamble processing on the signal to be transmitted, and the preamble processing increases the power of the signal to be transmitted; 功率限制算法选择模块，用于根据选择规则选择功率限制算法；A power limiting algorithm selection module, configured to select a power limiting algorithm according to a selection rule; 功率限制模块，用于根据所选的功率限制算法对前序处理后的信号进行功率限制操作；A power limiting module, configured to perform a power limiting operation on the pre-processed signal according to the selected power limiting algorithm; 预编码后信号生成模块，用于根据功率限制操作后的信号生成预编码后的信号。The precoded signal generating module is configured to generate a precoded signal according to the signal after the power limitation operation. 15.根据权利要求14所述的发射机，其特征在于，所述功率限制算法包括求模算法和非求模功率限制算法，所述功率限制算法选择模块用于根据选择规则在求模算法和非求模功率限制算法中选择一种。15. The transmitter according to claim 14, wherein the power limitation algorithm comprises a modulo algorithm and a non-modulo power limitation algorithm, and the power limitation algorithm selection module is used to select between the modulo algorithm and the power limitation algorithm according to the selection rule Choose one of the non-modulo power limiting algorithms. 16.根据权利要求14所述的发射机，其特征在于，所述发射机还包括：16. The transmitter according to claim 14, further comprising: 求模信息发送模块，用于向接收机发送用于指示发射机是否已经对预编码前序处理后的信号进行求模操作的求模信息。The modulo information sending module is configured to send modulo information to the receiver indicating whether the transmitter has performed a modulo operation on the pre-coded pre-processed signal. 17.一种接收机，其特征在于，包括：17. A receiver, characterized in that it comprises: 求模信息接收模块，用于接收发射机发送的求模信息；The modulus information receiving module is used to receive the modulus information sent by the transmitter; 求模判断模块，用于根据所述求模信息判断发射机是否对预编码前序处理后的信号进行了求模操作；A modulo judgment module, configured to judge whether the transmitter has performed a modulo operation on the pre-coded pre-processed signal according to the modulo information; 求模恢复模块，用于当求模判断模块的判断结果为是时，对所接收信号进行求模恢复操作。The modulo recovery module is used to perform a modulo recovery operation on the received signal when the judgment result of the modulo judgment module is yes. 18.一种预编码系统，包括发射机和接收机，其特征在于，所述发射机包括：18. A precoding system, comprising a transmitter and a receiver, wherein the transmitter comprises: 预编码前序处理模块，用于对待发送信号进行预编码前序处理，所述前序处理使待发送信号的功率增大；The precoding preamble processing module is used to perform precoding preamble processing on the signal to be transmitted, and the preamble processing increases the power of the signal to be transmitted; 功率限制算法选择模块，用于根据选择规则选择功率限制算法；A power limiting algorithm selection module, configured to select a power limiting algorithm according to a selection rule; 功率限制模块，用于根据所选的功率限制算法对前序处理后的信号进行功率限制操作；A power limiting module, configured to perform a power limiting operation on the pre-processed signal according to the selected power limiting algorithm; 预编码后信号生成模块，用于根据功率限制操作后的信号生成预编码后的信号。The precoded signal generating module is configured to generate a precoded signal according to the signal after the power limitation operation. 19.根据权利要求18所述的预编码系统，其特征在于，19. The precoding system according to claim 18, characterized in that, 所述发射机还包括：The transmitter also includes: 求模信息发送模块，用于向接收机发送用于指示发射机是否已经对预编码前序处理后的信号进行求模操作的求模信息；The modulo information sending module is used to send modulo information to the receiver indicating whether the transmitter has performed a modulo operation on the pre-coded pre-processed signal; 所述接收机包括：The receiver includes: 求模信息接收模块，用于接收发射机发送的求模信息；The modulus information receiving module is used to receive the modulus information sent by the transmitter; 求模判断模块，用于根据所述求模信息判断发射机是否对预编码前序处理后的信号进行求模操作；A modulo judgment module, configured to judge whether the transmitter performs a modulo operation on the pre-coded pre-processed signal according to the modulo information; 求模恢复模块，用于当求模判断模块的判断结果为是时，对所接收信号进行求模恢复操作。The modulo recovery module is used to perform a modulo recovery operation on the received signal when the judgment result of the modulo judgment module is yes.
CN2012100707846A 2012-03-16 2012-03-16 Pre-coding method, system and device Pending CN103312397A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105392205A (en) * 2015-10-21 2016-03-09 国家电网公司 User scheduling method for electricity distribution and utilization communication
US10313768B2 (en) 2013-04-03 2019-06-04 Huawei Technologies Co., Ltd. Data scheduling and switching method, apparatus, system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270459A (en) * 1999-04-12 2000-10-18 阿尔卡塔尔公司 Improved self adapted quick power control in CDMA channels
CN1734963A (en) * 2004-08-12 2006-02-15 华为技术有限公司 Inner loop power frequency control method
CN101459488A (en) * 2007-12-10 2009-06-17 中兴通讯股份有限公司 Signal processing method and system for multi-user MIMO
WO2011129261A1 (en) * 2010-04-16 2011-10-20 シャープ株式会社 Base station apparatus, wireless communication system, transmission method of base station apparatus, and transmission program

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6173189B1 (en) * 1998-12-18 2001-01-09 Motorola, Inc. Method and apparatus for multi-protocol reverse channel infrastructure sharing
US6553081B1 (en) * 1999-05-06 2003-04-22 Adtran, Inc. Method and apparatus for removing DC from the output of a precoder in a transmitter of a data communication system
AU2003276178A1 (en) * 2003-10-24 2005-05-19 Ntt Docomo, Inc. Apparatus and method for precoding a multicarrier signal
US7633994B2 (en) * 2004-07-30 2009-12-15 Rearden, LLC. System and method for distributed input-distributed output wireless communications
US20070165738A1 (en) * 2005-10-27 2007-07-19 Barriac Gwendolyn D Method and apparatus for pre-coding for a mimo system
US7995671B2 (en) * 2007-02-09 2011-08-09 Qualcomm Incorporated Multiple-input multiple-output (MIMO) transmission with rank-dependent precoding
US7629902B2 (en) * 2007-06-08 2009-12-08 Samsung Electronics Co., Ltd. MIMO wireless precoding system robust to power imbalance
KR101336961B1 (en) * 2008-04-17 2013-12-04 삼성전자주식회사 Apparatus and method for precoding using midamble in a multiple input multiple ouput wireless communication system
KR20120009649A (en) * 2010-07-20 2012-02-02 삼성전자주식회사 Preprocessing method and apparatus using channel orthogonalization in multi-user multi-antenna system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270459A (en) * 1999-04-12 2000-10-18 阿尔卡塔尔公司 Improved self adapted quick power control in CDMA channels
CN1734963A (en) * 2004-08-12 2006-02-15 华为技术有限公司 Inner loop power frequency control method
CN101459488A (en) * 2007-12-10 2009-06-17 中兴通讯股份有限公司 Signal processing method and system for multi-user MIMO
WO2011129261A1 (en) * 2010-04-16 2011-10-20 シャープ株式会社 Base station apparatus, wireless communication system, transmission method of base station apparatus, and transmission program

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10313768B2 (en) 2013-04-03 2019-06-04 Huawei Technologies Co., Ltd. Data scheduling and switching method, apparatus, system
CN105392205A (en) * 2015-10-21 2016-03-09 国家电网公司 User scheduling method for electricity distribution and utilization communication
CN105392205B (en) * 2015-10-21 2018-11-02 国家电网公司 A kind of user scheduling method towards adapted telecommunication

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