CN102986184A - Method, receiver, transmitter and communication system for suppressing out-of-band radiation - Google Patents

Method, receiver, transmitter and communication system for suppressing out-of-band radiation Download PDF

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Publication number
CN102986184A
CN102986184A CN2011800011119A CN201180001111A CN102986184A CN 102986184 A CN102986184 A CN 102986184A CN 2011800011119 A CN2011800011119 A CN 2011800011119A CN 201180001111 A CN201180001111 A CN 201180001111A CN 102986184 A CN102986184 A CN 102986184A
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user
data
matrix
coding matrix
precoding
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孙国林
蒋伟
周向炜
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/26265—Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method, receiver, transmitter and communication system for suppressing Out-of-Band (OOB) Radiation are provided by the embodiments of the present invention, which effectively restrain the OOB Radiation of Orthogonal Frequency Division Multiplexing (OFDM) signals with lower complex level arithmetic. The method includes the following steps: for each user Uk of OFDM system separately generating a precoding matrix Gk of data of said user Uk; precoding data of said user Uk by using said precoding matrix Gk; mapping said precoded data of all users to corresponding sub-carriers, and implementing OFDM modulation to form transmitting signals. The method provided by the present invention reduces the complex level of precoding matrix selection for the transmitter; and greatly reduces the computing complex level of the receiver, because for the receiver, it only needs to de-precode the data of user Uk, and does not need to de-precode it together with the data of other users on all sub-carriers when receiving the transmitting symbols corresponding to the data of user Uk coded and transmitted by the transmitter.

Description

Suppress method, receiver, emitter and a kind of communication system of out-of-band radiation
Suppress method, receiver, emitter and a kind of art communication systems field of out-of-band radiation
The present invention relates to the communications field, more particularly to suppress method, receiver, emitter and a kind of communication system of out-of-band radiation.
Background technology
Fast-developing wireless communication system result in the great demand to frequency spectrum resource, and in order to improve the utilization rate of frequency spectrum resource, general method is in place reuse identical frequency range relatively far apart using channeling technology.However, this method can not solve root problem.Because, the utilization rate that the frequency spectrum resource of authorized user is distributed to according to existing spectrum management principle is actually very low, but, even if authorized user is temporarily without using these frequency spectrum resources, unauthorized user can not use the frequency spectrum resource for distributing to authorized user again, therefore cause very big waste.Cognitive radio（Cognitive Radio, CR) technology can pass through frequency spectrum perception（Spectrum Sensing, SS radio environment information) is obtained, ensureing normal using having distributed on the premise of frequency spectrum resource interferes not to authorized user, the temporary untapped frequency spectrum resource of " borrows " authorized user objectively improves the utilization rate of whole frequency spectrum resource.
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology mitigating frequency-selective fading is strong, spectrum efficiency is high, modulation /demodulation cylinder is single, it is widely used in the 4G technologies such as Long Term Evolution (Long-Term Evolution, LTE).Big bandwidth is divided into substantial amounts of subcarrier by OFDM technology, by closing some subcarriers, OFDM technology can neatly take the continuously or discontinuously spectral slice of frequency spectrum perception acquisition, simultaneously, in view of the continuity of standard compatibility and technological evolvement, OFDM technologies are considered as CR most suitable potential physical layer transmission technology.
OFDM technology is blocked using rectangular window function to time-domain signal, the saltus step that can have signal between continuous OFDM symbol border, is corresponded to frequency spectrum, is caused than larger out-of-band radiation（Out-of-Band Radiation, OOB Radiation ).In CR environment, because CR user is that the problem of being most concerned, may influence the development of CR technologies in itself to the interference of authorized user.Accordingly, it would be desirable to design the out-of-band radiation restrainable algorithms of OFDM technologies, the CR user based on OFDM is set to meet the requirements the out-of-band interference of authorized user. For the out-of-band radiation problem in OFDM technology, one of existing solution is to set guard band, i.e.; the subcarrier at frequency spectrum edge singly is closed by cylinder to realize; but, this effect for suppressing out-of-band radiation is poor, and wastes valuable frequency spectrum resource.Another solution is, by time-domain windowed, OFDM symbol edge-smoothing is transitioned into zero, so as to suppress out-of-band radiation, however, this method can bring the time domain of OFDM symbol to extend, is sacrificed to intersymbol interference（Inter-Symbol Interference, ISI) rejection ability.The three of existing solution are that active interference is eliminated（Active Interference Cancellation, AIC) method, i.e., according to the data of each OFDM symbol, interference is calculated in real time and eliminates subcarrier, and by reduction out-of-band radiation of cancelling out each other, but this method complexity is high, it is computationally intensive, actually implement relatively difficult.
The content of the invention
The embodiment of the present invention provides method, receiver, emitter and a kind of communication system for suppressing out-of-band radiation, effectively suppresses the out-of-band radiation of ofdm signal with the algorithm of lower complexity.
The embodiment of the present invention provides a kind of method for suppressing out-of-band radiation, including：The pre-coding matrix of the data of the user ^ is individually created for each user ^ in orthogonal frequency division multiplex OFDM system, the ofdm system includes multiple users, the user t/AFor any one in multiple users in ofdm system；Use the pre-coding matrix GkTo the user UkData carry out precoding；The data of all users of the process precoding are mapped on corresponding subcarrier, transmission signal is formed after carrying out OFDM modulation.
Another embodiment of the present invention provides a kind of method for suppressing out-of-band radiation, including：Receive the user ^ sent after emitter precoding the corresponding transmission signal note b of datak =Gkdk, described is pre-coding matrix, corresponding transmission signal when the data for the user ^ are non-precoded；Orthogonal frequency division multiplex OFDM demodulation is carried out, the estimate of the transmitting data after precoding is obtained;Solution precoding is carried out to the estimate, the d is obtainedkEstimate 4.
The embodiment of the present invention provides a kind of emitter, including：Pre-coding matrix generation module, for the pre-coding matrix for the data that the user ^ is individually created for each user ^ in orthogonal frequency division multiplex OFDM system, the ofdm system includes multiple users, and [^ is any one in multiple users in ofdm system to the user；Precoding module, for pre-coding matrix (the data progress precoding to the user ^ generated using the pre-coding matrix generation module；Transmission signal formation module, it is described for that will pass through The data of all users of coding module precoding are mapped on corresponding subcarrier, and transmission signal is formed after carrying out OFDM modulation.
Another embodiment of the present invention provides a kind of receiver, including：Receiving module, the user U sent for receiving after transmitter codingkThe corresponding transmitting symbol G of datakdk, note=Gkdk, described is pre-coding matrix, corresponding transmitting symbol when the data for the user ^ are un-encoded；Demodulation module, for described<Carry out orthogonal frequency division multiplex OFDM demodulation, obtained estimate;Precoding module is solved, for entering row decoding to the estimate, described estimate is obtained.
The embodiment of the present invention provides a kind of communication system, and the communication system includes transmitter and receiver；The emitter, for for each user U in orthogonal frequency division multiplex OFDM systemkIt is individually created the user ukData pre-coding matrix, use the pre-coding matrix<To the user ukData carry out precoding, the data of all users of the process precoding are mapped on corresponding subcarrier, carry out
Transmission signal is formed after OFDM modulation, the ofdm system includes multiple users, and [^ is any one in multiple users in ofdm system to the user；The receiver, the corresponding transmitting symbol of data for receiving the user sent after the transmitter coding is demodulated to described, obtains (estimate, to estimate progress solution precoding, described estimate 4 is obtained, b is rememberedk =Gkdk, described (is pre-coding matrix, described is the user t/AData it is non-precoded when corresponding transmitting symbol.
It was found from the embodiments of the present invention, because the pre-coding matrix of the data generation to send is for unique user t/AThe pre-coding matrix of the data of generation, and using the pre-coding matrix (to the user t/AData encoded.Therefore, for emitter, the complexity for choosing pre-coding matrix can be reduced；For receiver, the user t/ that is sent after transmitter coding is being receivedAData corresponding transmitting symbol when, due to needing only to user ^ data carrying out solution precoding, without the data of other users on all subcarriers are carried out into solution precoding together, therefore greatly reduce the computation complexity of receiver.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, cylinder will be made to the required accompanying drawing used in prior art or embodiment description below singly to introduce, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, creative work is not being paid Property on the premise of, other accompanying drawings can also be obtained such as these accompanying drawings.
Fig. 1 is the method flow schematic diagram of suppression out-of-band radiation provided in an embodiment of the present invention；
Fig. 2 is the emitter schematic diagram provided in an embodiment of the present invention comprising precoder；
Fig. 3 is the method flow schematic diagram for the suppression out-of-band radiation that another embodiment of the present invention is provided；Fig. 4 is the receiver schematic diagram provided in an embodiment of the present invention comprising decoder；
Fig. 5 is transmitter logic structural representation provided in an embodiment of the present invention；
Fig. 6 is the transmitter logic structural representation that another embodiment of the present invention is provided；
Fig. 7 is the transmitter logic structural representation that another embodiment of the present invention is provided；
Fig. 8 is the transmitter logic structural representation that another embodiment of the present invention is provided；
Fig. 9 is receiver logical construction schematic diagram provided in an embodiment of the present invention；
Figure 10 is the receiver logical construction schematic diagram that another embodiment of the present invention is provided；
Figure 11 is communication system logical structural representation provided in an embodiment of the present invention.
Embodiment
The embodiments of the invention provide method, receiver, emitter and a kind of communication system for suppressing out-of-band radiation, effectively suppress the out-of-band radiation of ofdm signal with the algorithm of lower complexity.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
Accompanying drawing 1 is referred to, is a kind of method flow schematic diagram for suppressing out-of-band radiation provided in an embodiment of the present invention.The executive agent of this method can be the emitter in ofdm system, and methods described mainly includes step：S101, be individually created for each user ^ in orthogonal frequency division multiplex OFDM system the data of the user ^ pre-coding matrix (, the ofdm system includes multiple users, and [^ is any one in multiple users in OFDM systems to the user.
In order to clearly illustrate method provided in an embodiment of the present invention, the term or definition that are related in OFDM technology are illustrated below.
Assuming that the set of available subcarrier is represented with ^ in ofdm system, the quantity of subcarrier is N, correspondence Frequency spectrum can be continuous or discontinuous.Baseband complex signal in descending each symbol period can be expressed as in time domain：
Wherein, the data on n-th of subcarrier, 7 are represented：Represent the OFDM symbol length of non-prefixing, window function/(0 definition is:
ίΐ -Τ ≤t≤T
I(t) = \ , g _ _ s
[0, otherwise
Wherein, 7；Represent cyclic prefix（Cyclic Prefix, CP) length.The complete corresponding Fourier transformation of OFDM symbols comprising CP can be expressed as on frequency domain：
S{f) = ^_dnan{ f) wherein,
-MT,-TS)(J--) n
A (f)=Te ^sincW/--)) wherein, T=TS+Tg, represent the OFDM symbol length for including CP, functionSincW = sin(J^, ajf) represent the corresponding frequency spectrum of n-th of subcarrier.
The power language density (Power Spectrum Density, PSD) of ofdm signal is expressed as：
P(f)=^E{\S(f) \2} = ^aT(f)E{ddHA (f) wherein, a (f)=(ano(f), ani(f), d = {dn, dn, ... , dn T , ntN, ie { 0,1 ..., N-l } subscript T, *, H represents transposition, complex conjugate and the conjugate transposition of vector or matrix respectively.
Data progress precoding from all users on sub-carrier in the prior art is different, and in embodiments of the present invention, the object for carrying out precoding is the data of unique user, that is, the pre-coding matrix generated is the pre-coding matrix for belonging to the data of some user.Assuming that user is k-th of user in ofdm system, it is user Generating the pre-coding matrix of the data of the user includes：Think the user/λSample value structural matrix on the different frequent points of the frequency spectrum of the subcarrier of distribution herein,（The relation of sum meets (=0；The matrix Α is subjected to singular value decomposition（Singular Value Decomposition, SVD), obtain rank matrix here to distribute to the user [^ number of sub carrier wave；The rank rear for choosing the matrix constitutes the pre-coding matrix, and the data for the user ^ here are corresponding when un-encoded to launch the symbol numbers that symbol is included, be designated as=..., dMk_)T..., dM TRepresent ..., 4^) transposition.
Specifically, it is that the user ^ distributes a subcarrier, individual subcarrier herein is assigned to only user Uk, the frequency spectrum of the subcarrier is designated as i and takes 0,1 ..., Nk-, then frequency j is chosen on these subcarrier spectrum edges, frequency j quantity and position can be according to depending on the requirements for suppressing out-of-band radiation, usually, the requirement for suppressing out-of-band radiation is higher, out-of-band radiation is completely inhibited as much as possible, then the quantity that frequency j is chosen on these subcarrier spectrum edges should be more.In the embodiment of the present invention, I takes 0,1 ..., L-1, note vector for=" (/ ..., aN k k— τ, wherein, " (/ ... ,/') represents " (/ ... ,-transposition, with the vectorial ^ (/；) constitute matrix described in matrix Α be designated as：
According to the value of above-mentioned/sum, Rank matrix.
If extending to all users, the object function of actually pre-coding matrix is
Singular value decomposition is carried out to matrix A:
Α ,=υ, Σ, Υ, ' wherein, t/AIt is Lx L matrix, is><^ matrix, ^ is ^><^ matrix.The corresponding transmitting symbol of k-th of user ^ data is expressed as 4=(, dx, ... ,άΜ^)τ, include ^ symbol, Mk≤Nk.Choose matrix ^ rear MkRow constitute a NA xMkRank matrix, the ^ xMkRank matrix is pre-coding matrix.The characteristic decomposed according to SVD, pre-coding matrix is orthogonal matrix： GkG=1, wherein ,/represent unit matrix.
5102, using the pre-coding matrix to the user UkData encoded.
Specifically, can be by user U described in the pre-coding matrix premultiplicationkData it is un-encoded when corresponding transmitting symbol, that is, obtain it is encoded after user ^ data it is corresponding transmitting symbol note bk = Gkdk, the schematic diagram of its precoder see accompanying drawing 2.
5103, the data of all users of the process precoding are mapped on corresponding subcarrier, transmission signal is formed after carrying out OFDM modulation.
The transmission signal G of formationkdkSent by emitter to the receiver of system.
It was found from the embodiments of the present invention, because the pre-coding matrix of the data generation to send is for unique user t/AThe pre-coding matrix of the data of generation, and using the pre-coding matrix (to the user t/AData encoded.Therefore, for emitter, the complexity for choosing pre-coding matrix can be reduced；For receiver, the user t/ that is sent after transmitter coding is being receivedAData corresponding transmitting symbol when, due to needing only to user ^ data carrying out solution precoding, without by all subcarriers On the data of other users carry out solution precoding together, therefore greatly reduce the computation complexity of receiver.
Accompanying drawing 3 is referred to, is the method flow schematic diagram for the suppression out-of-band radiation that another embodiment of the present invention is provided.The executive agent of this method can be the receiver in ofdm system, and methods described mainly includes step：S301, receives the user U sent after transmitter codingkThe corresponding transmission signal G of datakdk.Remember bk = Gkdk, wherein, it is pre-coding matrix, is user t/AData it is un-encoded when corresponding transmission signal, the generating process of pre-coding matrix and vector representation illustrated in accompanying drawing 1, see previous embodiment, here is omitted.
5302, to described<Carry out orthogonal frequency division multiplex OFDM demodulation, the estimate of the transmitting data after acquisition is encoded.
5303, solution precoding, obtained estimate are carried out to estimate.
Specific method can by the associate matrix Gf premultiplication estimates of pre-coding matrix, that is, obtain dkEstimate=, the schematic diagram of its decoder see accompanying drawing 4.
It was found from the embodiments of the present invention, because receiver is in the corresponding transmitting symbol of the data that receive the user ^ sent after transmitter coding, it is thus only necessary to by user UkData carry out solution precoding, without the data of other users on all subcarriers are carried out into solution precoding together.Needed with the receiver of prior art to all subcarriers（Assuming that quantity is N number of）Enter row decoding（Most of data of decoding belong to other users）When algorithm complex be fixed as o (N2) compare, the method provided in an embodiment of the present invention for suppressing out-of-band radiation, algorithm complex when it is decoded for 0 (）, therefore greatly reduce the design complexities of receiver.
Accompanying drawing 5 is referred to, is transmitter logic structural representation provided in an embodiment of the present invention.The emitter of Fig. 5 examples can be the emitter of ofdm system.For convenience of description, it illustrate only the part related to the embodiment of the present invention.The device 50 of the reduction radiation of Fig. 5 examples includes pre-coding matrix generation module 501, precoding module 502 and transmission signal formation module 503, wherein：
Pre-coding matrix generation module 501, for for each user t/ in orthogonal frequency division multiplex OFDM systemAIt is individually created the user t/AData pre-coding matrix, the ofdm system include multiple users, the user t/AFor any one in multiple users in ofdm system；
Coding module 502, for the pre-coding matrix generated using the pre-coding matrix generation module 501 GkTo the user UkData carry out precoding；
Transmission signal formation module 503, for the data of all users after precoding module processing to be mapped into corresponding subcarrier, transmission signal is formed after carrying out OFDM modulation.
It should be noted that, in the embodiment of above emitter, the division of each functional module is merely illustrative of, can be as needed in practical application, the convenient consideration of the realization of the configuration requirement or software of such as corresponding hardware, and above-mentioned functions are distributed and completed by different functional module, will the internal structure of the emitter be divided into different functional modules, to complete all or part of function described above.And, in practical application, corresponding functional module in the present embodiment can be realized by corresponding hardware, corresponding software can also be performed by corresponding hardware to complete, for example, foregoing pre-coding matrix generation module, can be with the pre-coding matrix (hardware for performing the data that the user ^ is individually created for each user ^ in orthogonal frequency division multiplex OFDM system, such as precoding matrix generator or corresponding computer program is able to carry out so as to processor or other hardware devices completing foregoing function；Coding module as the aforementioned, can have execution is foregoing to use the pre-coding matrix generation module again（Or precoding matrix generator）The pre-coding matrix of generation is to the user t/AData carry out the hardware of precoding function, such as encoder or be able to carry out corresponding computer program so as to completing processor foregoing function or other hardware devices.
The pre-coding matrix generation module 501 of the example of accompanying drawing 5 can include matrix construction submodule 601 and acquisition submodule 602, as shown in Figure 6 the emitter 60 of another embodiment of the present invention offer, wherein：
Matrix construction submodule 601, for thinking each user t/ASample value structural matrix on the different frequent points of the frequency spectrum of the subcarrier of distribution；
Acquisition submodule 602, for obtaining GkWith 4 relation meet (=0 it is described.
The matrix construction submodule 601 of the example of accompanying drawing 6 can include allocation unit 701 and choose unit 702, acquisition submodule 602 includes singular value decomposition subelement 703 and pre-coding matrix structural unit 704, the emitter that another embodiment of the present invention as shown in accompanying drawing 7 is provided, wherein：
Allocation unit 701, for for the user t/AA distribution subcarrier, the subcarrier any frequency/on sample value be designated as i and take 0,1 ..., Nk-\;
Unit 702 is chosen, for choosing the frequency on the subcarrier spectrum edge, note vector is ak(fi) = (a0(fl), ^( {) ..., αΝ Λ^))τ, () ..., αΝ Λ^))τRepresent (/ ..., transposition, I takes 0,1 ..., L-1, with the vector (/ constituted matrix 4, matrix Λ is designated as：
Singular value decomposition subelement 703, for the matrix Α to be carried out into singular value decomposition, obtains NkxNkIt is the number of sub carrier wave for distributing to each user ^ described in r matrixes；
Pre-coding matrix structural unit 704, the pre-coding matrix is constituted for choosing the rank rear of the matrix, corresponding transmitting symbol quantity when the data for each user ^ are un-encoded, it is described be designated as=..., dMk—)T, <4 ..., represent 4 ..., Transposition.
The coding module 501 of accompanying drawing 5 to any example of accompanying drawing 7 can include premultiplication unit 801, the emitter that another embodiment of the present invention is provided as shown in Figure 5.Premultiplication unit 801 be used for by the data of each user ^ described in the pre-coding matrix premultiplication when un-encoded it is corresponding launch symbol obtain it is encoded after each user UkThe corresponding transmitting symbol G of datakdk, remember bk= Gkdk。
Accompanying drawing 9 is referred to, is receiver logical construction schematic diagram provided in an embodiment of the present invention.The receiver of Fig. 9 examples can be the receiver of ofdm system.For convenience of description, it illustrate only the part related to the embodiment of the present invention.The receiver of Fig. 9 examples includes receiving module 901, demodulation module 902 and decoding module 903, wherein：
Receiving module 901, the user U sent for receiving after transmitter codingkData it is corresponding transmitting symbol note bk=Gkdk, it is described<For pre-coding matrix, corresponding transmitting symbol when the data for the user are un-encoded；
Demodulation module 902, for being demodulated to described, obtained estimate;
Decoding module 903, for entering row decoding to the estimate, obtains described estimate 4. It should be noted that, in the embodiment of above receiver, the division of each functional module is merely illustrative of, can be as needed in practical application, the convenient consideration of the realization of the configuration requirement or software of such as corresponding hardware, and above-mentioned functions are distributed and completed by different functional module, will the internal structure of the receiver be divided into different functional modules, to complete all or part of function described above.And, in practical application, corresponding functional module in the present embodiment can be realized by corresponding hardware, corresponding software can also be performed by corresponding hardware to complete, for example, foregoing demodulation module, can have to perform to (the hardware being demodulated, such as demodulator or corresponding computer program is able to carry out so as to processor or other hardware devices completing foregoing function；Decoding module as the aforementioned again, can with performing the foregoing hardware for carrying out the estimate decoding function, such as decoder or be able to carry out corresponding computer program to complete processor foregoing function or other hardware devices.
The decoding module 903 of the example of accompanying drawing 9 can include premultiplication unit 1001, the receiver that another embodiment of the present invention is provided as shown in Figure 10.Premultiplication unit 1001 is used for estimate described in the associate matrix Gf premultiplications of the pre-coding matrix.
Accompanying drawing 11 is referred to, is communication system logical structural representation provided in an embodiment of the present invention.The communication system of Figure 11 examples can be ofdm system.For convenience of description, it illustrate only the part related to the embodiment of the present invention.The communication system of Figure 11 examples include accompanying drawing 5 to any example of accompanying drawing 8 emitter 1101 and accompanying drawing 9 to any example of accompanying drawing 10 receiver 1102, wherein：
The emitter 1101, for [^ to be individually created the user U for each user in orthogonal frequency division multiplex OFDM systemkData pre-coding matrix, use the pre-coding matrix<To the user UkData carry out precoding, the data of all users of the process precoding are mapped on corresponding subcarrier, carry out forming transmission signal after OFDM modulation, the ofdm system includes multiple users, the user t ^ are any one in multiple users in ofdm system；
The receiver 1102, for receiving the user U sent after the emitter 1101 codingkThe corresponding transmitting symbol of data be demodulated to described, obtain that (estimate, solution precoding is carried out to the estimate, obtains described estimate 4, remembers bk = Gkdk, described is pre-coding matrix, corresponding transmitting symbol when the data for the user ^ are un-encoded.
It should be noted that the content such as information exchange, implementation procedure between each module/unit of said apparatus, due to being based on same design with the inventive method embodiment, its technique effect brought is implemented with the inventive method Example is identical, and particular content can be found in the narration in the inventive method embodiment, and here is omitted.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment can be by program to instruct the hardware of correlation to complete, the program can be stored in a computer-readable recording medium, and storage medium can include：Read-only storage（ROM, Read Only Memory), random access memory（RAM, Random Access Memory), disk or CD etc..
Method, receiver, emitter and one kind to suppression out-of-band radiation provided in an embodiment of the present invention are set forth above, and the explanation of above example is only intended to the method and its core concept for helping to understand the present invention；Simultaneously for those of ordinary skill in the art, according to the thought of the present invention, it will change in specific embodiments and applications, in summary, this specification content should not be construed as limiting the invention.

Claims (13)

  1. Claim
    1st, a kind of method for suppressing out-of-band radiation, it is characterised in that methods described includes：
    For each user in orthogonal frequency division multiplex OFDM system, [^ generates user [the pre-coding matrix G of ^ datak, the ofdm system include multiple users, the user UkFor any one in multiple users in the ofdm system；
    Using the pre-coding matrix (to the user UkData carry out precoding；
    The data of all users of the process precoding are mapped on corresponding subcarrier, transmission signal is formed after carrying out OFDM modulation.
    2nd, the method as described in claim 1, it is characterised in that the pre-coding matrix that each user ^ in orthogonal frequency division multiplex OFDM system generates the data of the user ^ includes：
    Think the subcarrier of each user ^ distribution frequency spectrum different frequent points on sample value structural matrix
    ObtainGkRelation with 4 meets Λ<=0 it is described.
    3rd, method as claimed in claim 2, it is characterised in that described to think that [the sample value structural matrix 4 on the subcarrier different frequent points of ^ distribution includes each user：
    For each user ^ distribution subcarrier, the frequency spectrum of i-th ' the subcarrier is designated as a (/), and i takes 0,1 ..., Nk-\ ;
    The frequency j of the subcarrier spectrum is chosen, note vector is={ a { fl), " (/, aN k k_ ))T, " (/ ..., represent, ..., a^if) transposition, I takes 0,1 ..., L-1-1, with the vector (/ constituted matrix A, the matrix 4 is designated as：
    「V
    a
    A 4th, method as claimed in claim 2, it is characterised in that the acquisition<Relation with 4 is met<=0 it is described including：
    The matrix A is subjected to singular value decomposition, obtains being to distribute to each user described in rank matrixUkNumber of sub carrier wave；
    The rank rear for choosing the matrix constitutes the pre-coding matrix, and described is each user UkData it is un-encoded when corresponding transmitting symbol quantity, the dkIt is designated as dk=(d^ ..., 4 ..., represent ..., transposition.
    5th, method as claimed in claim 2, it is characterised in that described to use the pre-coding matrix<To the user UkData carry out precoding be：
    By each user u described in the pre-coding matrix premultiplicationkData it is un-encoded when it is corresponding transmitting symbol obtain it is encoded after each user UkThe corresponding transmitting symbol G of datakdk, remember bk = Gkdk。
    6th, a kind of method for suppressing out-of-band radiation, it is characterised in that methods described includes：
    Receive the user U sent after emitter precodingkThe corresponding transmission signal G of datakdk, remember bk =Gkdk, described (is pre-coding matrix, corresponding transmission signal when the data for the user ^ are non-precoded；
    Orthogonal frequency division multiplex OFDM demodulation is carried out, the estimate of the transmitting data after precoding is obtained
    4；
    Solution precoding is carried out to the estimate, described estimate 4 is obtained.
    7th, method as claimed in claim 6, it is characterised in that described to include to estimate progress solution precoding：
    With the pre-coding matrix GkAssociate matrix Gf premultiplications described in estimate.
    8th, a kind of emitter, it is characterised in that the emitter includes：
    Pre-coding matrix generation module, for for each user in orthogonal frequency division multiplex OFDM system, [^ to be individually created the pre-coding matrix of the data of the user ^, the ofdm system includes multiple users, and the user ^ is any one in multiple users in ofdm system；
    Precoding module, for the pre-coding matrix using pre-coding matrix generation module generation (to the user UkData carry out precoding；
    Transmission signal formation module, for the data of all users Jing Guo the coding module precoding to be reflected It is mapped on corresponding subcarrier, transmission signal is formed after carrying out OFDM modulation.
    9th, emitter as claimed in claim 8, it is characterised in that the pre-coding matrix generation module includes matrix construction submodule and acquisition submodule；
    Sample value structural matrix on the matrix construction submodule, the different frequent points of the frequency spectrum of the subcarrier for thinking each user ^ distribution；
    The acquisition submodule, for obtaining GkWith 4 relation meet (=0 it is described.
    10th, emitter as claimed in claim 9, it is characterised in that the matrix construction submodule includes allocation unit and chooses unit；
    The allocation unit, for distributing a subcarrier for each user ^, the subcarrier spectrum is designated as af (/) and is designated as af f), i takes 0,1 ..., Nk-V,
    The selection unit, for choose the frequency on the subcarrier spectrum edge/；, note vector α (/ it is a (fl) = ( 0(fl), (ift) ..., Represent
    (/ ... ,-transposition, I takes 0,1 ..., L-1, with the vector (/ constituted matrix 4, the matrix Α is designated as：
    Α,
    (" (Λ—
    11st, emitter as claimed in claim 9, it is characterised in that the acquisition submodule includes singular value decomposition subelement and pre-coding matrix structural unit；
    The singular value decomposition subelement, for by the matrix Α carry out singular value decomposition, NkxNkIt is to distribute to each user [^ number of sub carrier wave described in rank matrix；
    The pre-coding matrix structural unit, the pre-coding matrix is constituted for choosing the rank rear of the matrix, it is described for each user [corresponding transmitting symbol quantity when ^ data are un-encoded, it is described be designated as=..., H<4 ..., represent 4 ..., 1) Transposition.
    12nd, emitter as claimed in claim 9, it is characterised in that the precoding module includes：Premultiplication unit, for by the data of each user ^ described in the pre-coding matrix premultiplication when un-encoded it is corresponding transmitting symbol obtain it is encoded after each user UkThe corresponding transmitting symbol of data
    13rd, a kind of receiver, it is characterised in that the receiver includes：
    Receiving module, the corresponding transmitting symbol note of the user ^ sent for receiving after transmitter coding data=(, described is pre-coding matrix, corresponding transmitting symbol when the data for the user ^ are un-encoded；
    Demodulation module, for described<Carry out orthogonal frequency division multiplex OFDM demodulation, obtained estimate 4;
    Precoding module is solved, for entering row decoding to the estimate, described estimate is obtained.
    14th, receiver as claimed in claim 13, it is characterised in that the decoding module includes premultiplication unit, for the pre-coding matrix GkAssociate matrix Gf premultiplications described in estimate.
    15th, a kind of communication system, it is characterised in that the communication system includes transmitter and receiver；The emitter, for [^ to be individually created the user U for each user in orthogonal frequency division multiplex OFDM systemkData pre-coding matrix, using the pre-coding matrix (to the user UkData carry out precoding, the data of all users of the process precoding are mapped on corresponding subcarrier, carry out forming transmission signal after OFDM modulation, the ofdm system includes multiple users, the user ^ is any one in multiple users in ofdm system；
    The receiver, the user U sent for receiving after the transmitter codingkThe corresponding transmitting symbol of data be demodulated to described, obtain that (estimate, solution precoding is carried out to the estimate, obtains described estimate, remembers bk =Gkdk, described (is pre-coding matrix, described is the user ukData it is non-precoded when corresponding transmitting symbol.
CN2011800011119A 2011-06-23 2011-06-23 Method, receiver, transmitter and communication system for suppressing out-of-band radiation Pending CN102986184A (en)

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